package httpserver_test

import (
	"bytes"
	"context"
	"encoding/json"
	"io"
	"net/http"
	"net/http/httptest"
	"sort"
	"strings"
	"testing"
	"time"

	"github.com/krow/krow-backend/go-api/internal/db"
	"github.com/krow/krow-backend/go-api/internal/httpserver"
	"github.com/krow/krow-backend/go-api/internal/testutil"
)

type api struct {
	t       *testing.T
	handler http.Handler
	orgID   string
	h       *testutil.Harness
	srv     *httpserver.Server

	// The signed-in session every do() call carries, and who it belongs to.
	cookie *http.Cookie
	userID string
	email  string
}

// newAPI builds a server and signs in as the seeded user.
//
// The sign-in is part of the harness rather than part of each test because
// every endpoint below now requires one: without it the thirty-odd existing
// tests in this file would all assert 401 instead of what they were written to
// check. They are unchanged; the cookie travels in do().
func newAPI(t *testing.T, opts ...httpserver.Option) *api {
	t.Helper()
	h := testutil.New(t)
	srv := newServer(t, h, nil, opts...)

	a := &api{t: t, handler: srv.Handler(), orgID: h.OrgID, h: h, srv: srv}
	a.userID, a.email = seededUser(t, h.Pool)
	setPassword(t, h.Pool, a.userID)

	result := signIn(t, a.handler, a.email, harnessPassword, false)
	if result.code != http.StatusOK || result.cookie == nil {
		t.Fatalf("the harness could not sign in: status %d, cookie %v", result.code, result.cookie)
	}
	a.cookie = result.cookie
	return a
}

type response struct {
	code int
	body map[string]any
}

func (a *api) do(method, path string, payload any) response {
	a.t.Helper()
	var body io.Reader
	if payload != nil {
		raw, err := json.Marshal(payload)
		if err != nil {
			a.t.Fatalf("encode payload: %v", err)
		}
		body = bytes.NewReader(raw)
	}
	req := httptest.NewRequest(method, path, body)
	if a.cookie != nil {
		req.AddCookie(a.cookie)
	}
	rec := httptest.NewRecorder()
	a.handler.ServeHTTP(rec, req)

	out := response{code: rec.Code}
	if rec.Body.Len() > 0 {
		if err := json.Unmarshal(rec.Body.Bytes(), &out.body); err != nil {
			a.t.Fatalf("%s %s: response is not JSON: %s", method, path, rec.Body.String())
		}
	}
	return out
}

// doAnon is do() without the session cookie: the request a signed-out browser,
// or anyone who has never signed in, actually sends.
func (a *api) doAnon(method, path string, payload any) response {
	a.t.Helper()
	var body io.Reader
	if payload != nil {
		raw, err := json.Marshal(payload)
		if err != nil {
			a.t.Fatalf("encode payload: %v", err)
		}
		body = bytes.NewReader(raw)
	}
	req := httptest.NewRequest(method, path, body)
	rec := httptest.NewRecorder()
	a.handler.ServeHTTP(rec, req)

	out := response{code: rec.Code}
	if rec.Body.Len() > 0 {
		_ = json.Unmarshal(rec.Body.Bytes(), &out.body)
	}
	return out
}

// as is do() performed by a specific actor, for the role and ownership tests.
func (a *api) as(act actor, method, path string, payload any) response {
	a.t.Helper()
	var body io.Reader
	if payload != nil {
		raw, err := json.Marshal(payload)
		if err != nil {
			a.t.Fatalf("encode payload: %v", err)
		}
		body = bytes.NewReader(raw)
	}
	req := httptest.NewRequest(method, path, body)
	if act.cookie != nil {
		req.AddCookie(act.cookie)
	}
	rec := httptest.NewRecorder()
	a.handler.ServeHTTP(rec, req)

	out := response{code: rec.Code}
	if rec.Body.Len() > 0 {
		_ = json.Unmarshal(rec.Body.Bytes(), &out.body)
	}
	return out
}

// codeOrEmpty reads the contract's error code, or "" when the response carried
// no error envelope. Distinct from errCode, which fails the test when there is
// no error: the role matrix needs to look at successes and refusals alike.
func (r response) codeOrEmpty() string {
	body, _ := r.body["error"].(map[string]any)
	if body == nil {
		return ""
	}
	code, _ := body["code"].(string)
	return code
}

// doWith is do() with a caller-supplied cookie, for tests that hold more than
// one session.
func (a *api) doWith(cookie *http.Cookie, method, path string) response {
	a.t.Helper()
	req := httptest.NewRequest(method, path, nil)
	if cookie != nil {
		req.AddCookie(cookie)
	}
	rec := httptest.NewRecorder()
	a.handler.ServeHTTP(rec, req)

	out := response{code: rec.Code}
	if rec.Body.Len() > 0 {
		_ = json.Unmarshal(rec.Body.Bytes(), &out.body)
	}
	return out
}

func (r response) records(t *testing.T) []map[string]any {
	t.Helper()
	raw, ok := r.body["data"].([]any)
	if !ok {
		t.Fatalf("expected a data array, got %#v", r.body)
	}
	out := make([]map[string]any, 0, len(raw))
	for _, e := range raw {
		out = append(out, e.(map[string]any))
	}
	return out
}

func (r response) record(t *testing.T) map[string]any {
	t.Helper()
	rec, ok := r.body["data"].(map[string]any)
	if !ok {
		t.Fatalf("expected a data object, got %#v", r.body)
	}
	return rec
}

func (r response) meta(t *testing.T) map[string]any {
	t.Helper()
	m, ok := r.body["meta"].(map[string]any)
	if !ok {
		t.Fatalf("expected meta, got %#v", r.body)
	}
	return m
}

func (r response) errCode(t *testing.T) string {
	t.Helper()
	e, ok := r.body["error"].(map[string]any)
	if !ok {
		t.Fatalf("expected an error envelope, got %#v", r.body)
	}
	return e["code"].(string)
}

/* ── Collections ────────────────────────────────────────────────────────── */

func TestListEveryResource(t *testing.T) {
	a := newAPI(t)
	// Every collection endpoint answers 200 with an envelope, seeded or not.
	for _, path := range []string{
		"job-postings", "job-applications", "ai-interviews", "staff", "worker-profiles",
		"courses", "learning-paths", "role-categories", "certifications",
		"user-activity", "evidence", "assignments", "shift-records",
		"employee-roles",
	} {
		r := a.do("GET", "/api/v1/"+path, nil)
		if r.code != http.StatusOK {
			t.Errorf("GET %s = %d, want 200", path, r.code)
			continue
		}
		r.records(t)
		r.meta(t)
	}
}

// An empty result is 200 with an empty array, never a 404. api-contract.md §8.
//
// Asked as a filter that matches nothing, rather than as a collection that
// happens to be empty. This used to read /assignments on the strength of the
// fixture shipping none, so seeding a single assignment broke a test about
// status codes. The contract is about the empty result, not about which
// collection is empty this week.
func TestEmptyCollectionIs200(t *testing.T) {
	a := newAPI(t)
	r := a.do("GET", "/api/v1/assignments?status=cancelled", nil)
	if r.code != http.StatusOK {
		t.Fatalf("code = %d, want 200", r.code)
	}
	if got := r.records(t); len(got) != 0 {
		t.Fatalf("expected no assignments, got %d", len(got))
	}
	if total := r.meta(t)["total"].(float64); total != 0 {
		t.Errorf("meta.total = %v, want 0", total)
	}
}

// The default limit is the resource's own, taken from the frontend call site.
// job-applications is 200 sorted -ai_score; shift-records is 500.
func TestEndpointSpecificDefaults(t *testing.T) {
	a := newAPI(t)
	for _, tc := range []struct {
		path  string
		limit float64
	}{
		{"job-postings", 100}, {"job-applications", 200}, {"shift-records", 500},
		{"worker-profiles", 500}, {"courses", 200}, {"user-activity", 500},
		{"ai-interviews", 100}, {"staff", 100}, {"role-categories", 100},
		{"certifications", 200}, {"evidence", 200}, {"assignments", 500},
		{"learning-paths", 100}, {"employee-roles", 200},
	} {
		m := a.do("GET", "/api/v1/"+tc.path, nil).meta(t)
		if m["limit"] != tc.limit {
			t.Errorf("%s default limit = %v, want %v", tc.path, m["limit"], tc.limit)
		}
	}
}

func TestLimitAndTruncationMeta(t *testing.T) {
	a := newAPI(t)
	r := a.do("GET", "/api/v1/job-applications?limit=5", nil)
	recs, m := r.records(t), r.meta(t)
	if len(recs) != 5 {
		t.Fatalf("returned %d records, want 5", len(recs))
	}
	if m["returned"] != float64(5) {
		t.Errorf("meta.returned = %v, want 5", m["returned"])
	}
	if m["total"] != float64(24) {
		t.Errorf("meta.total = %v, want 24 (the total ignores the limit)", m["total"])
	}
	if m["truncated"] != true {
		t.Error("meta.truncated should be true when the page does not reach the total")
	}

	full := a.do("GET", "/api/v1/job-applications", nil)
	if full.meta(t)["truncated"] != false {
		t.Error("meta.truncated should be false when everything fits")
	}
}

func TestOffsetPaging(t *testing.T) {
	a := newAPI(t)
	first := a.do("GET", "/api/v1/job-applications?limit=10", nil).records(t)
	second := a.do("GET", "/api/v1/job-applications?limit=10&offset=10", nil).records(t)
	if len(first) != 10 || len(second) != 10 {
		t.Fatalf("page sizes = %d, %d", len(first), len(second))
	}
	seen := map[string]bool{}
	for _, r := range first {
		seen[r["id"].(string)] = true
	}
	for _, r := range second {
		if seen[r["id"].(string)] {
			t.Fatalf("record %s appeared on both pages", r["id"])
		}
	}
}

/* ── Sorting ────────────────────────────────────────────────────────────── */

// The default sort is the resource's own: -ai_score for applications.
func TestDefaultSortIsResourceSpecific(t *testing.T) {
	a := newAPI(t)
	recs := a.do("GET", "/api/v1/job-applications", nil).records(t)
	prev := 101.0
	for _, r := range recs {
		score := r["ai_score"].(float64)
		if score > prev {
			t.Fatalf("applications are not sorted by -ai_score: %v after %v", score, prev)
		}
		prev = score
	}

	profiles := a.do("GET", "/api/v1/worker-profiles", nil).records(t)
	prev = 1e9
	for _, r := range profiles {
		score := r["krow_score"].(float64)
		if score > prev {
			t.Fatalf("profiles are not sorted by -krow_score: %v after %v", score, prev)
		}
		prev = score
	}
}

// NULLS LAST in BOTH directions. store.js returns before applying the
// descending negation, so a null is greater than everything either way.
// PostgreSQL's default is NULLS FIRST on DESC, so the descending case is the
// one that breaks if the ordering is left implicit. api-contract.md §7.1.
func TestNullsSortLastInBothDirections(t *testing.T) {
	a := newAPI(t)

	// Every seeded posting has a null start_date, so a deliberate mix is built
	// here — otherwise the assertion passes trivially and proves nothing.
	for _, d := range []any{"2026-09-01", nil, "2026-07-15", nil, "2026-08-20"} {
		payload := map[string]any{"title": "Nulls Test"}
		if d != nil {
			payload["start_date"] = d
		}
		if r := a.do("POST", "/api/v1/job-postings", payload); r.code != http.StatusCreated {
			t.Fatalf("setup create = %d: %#v", r.code, r.body)
		}
	}

	for _, sortSpec := range []string{"start_date", "-start_date"} {
		recs := a.do("GET", "/api/v1/job-postings?sort="+sortSpec+"&limit=500", nil).records(t)

		var values []any
		for _, r := range recs {
			values = append(values, r["start_date"])
		}
		firstNull := -1
		for i, v := range values {
			if v == nil {
				firstNull = i
				break
			}
		}
		if firstNull == -1 {
			t.Fatalf("sort=%s: no nulls present, the test is not exercising anything", sortSpec)
		}
		for i := firstNull; i < len(values); i++ {
			if values[i] != nil {
				t.Fatalf("sort=%s: %v appears at position %d, after a null at %d — NULLS LAST is not applied",
					sortSpec, values[i], i, firstNull)
			}
		}
		if firstNull < 3 {
			t.Fatalf("sort=%s: only %d non-null values sorted before the nulls, expected 3",
				sortSpec, firstNull)
		}

		// And the non-null values are genuinely ordered.
		for i := 1; i < firstNull; i++ {
			prev, cur := values[i-1].(string), values[i].(string)
			if sortSpec == "start_date" && cur < prev {
				t.Errorf("ascending order broken: %s after %s", cur, prev)
			}
			if sortSpec == "-start_date" && cur > prev {
				t.Errorf("descending order broken: %s after %s", cur, prev)
			}
		}
	}
}

// PostgreSQL does not guarantee a stable sort. Every ORDER BY appends `, id`
// so repeated identical requests return the same order. api-contract.md §7.3.
func TestStableSortWithIDTiebreaker(t *testing.T) {
	a := newAPI(t)
	// Many applications share ai_score 0, so the tiebreaker decides their order.
	var first []string
	for attempt := 0; attempt < 5; attempt++ {
		recs := a.do("GET", "/api/v1/job-applications?sort=-ai_score", nil).records(t)
		ids := make([]string, 0, len(recs))
		for _, r := range recs {
			ids = append(ids, r["id"].(string))
		}
		if attempt == 0 {
			first = ids
			continue
		}
		for i := range ids {
			if ids[i] != first[i] {
				t.Fatalf("order changed between identical requests at position %d", i)
			}
		}
	}

	// And the tiebreaker really is id: within a score group, ids ascend.
	recs := a.do("GET", "/api/v1/job-applications?sort=-ai_score", nil).records(t)
	for i := 1; i < len(recs); i++ {
		if recs[i]["ai_score"] != recs[i-1]["ai_score"] {
			continue
		}
		if recs[i]["id"].(string) < recs[i-1]["id"].(string) {
			t.Fatalf("ids do not ascend within an equal-score group: %s after %s",
				recs[i]["id"], recs[i-1]["id"])
		}
	}
}

func TestSortAscendingAndUnknownField(t *testing.T) {
	a := newAPI(t)
	recs := a.do("GET", "/api/v1/job-applications?sort=ai_score", nil).records(t)
	prev := -1.0
	for _, r := range recs {
		if score := r["ai_score"].(float64); score < prev {
			t.Fatalf("ascending sort broken: %v after %v", score, prev)
		} else {
			prev = score
		}
	}

	r := a.do("GET", "/api/v1/job-applications?sort=-nonsense", nil)
	if r.code != http.StatusBadRequest {
		t.Errorf("unknown sort field = %d, want 400", r.code)
	}
	if code := r.errCode(t); code != "invalid_query" {
		t.Errorf("error code = %q, want invalid_query", code)
	}
}

/* ── Filtering ──────────────────────────────────────────────────────────── */

func TestFilterEquality(t *testing.T) {
	a := newAPI(t)
	postings := a.do("GET", "/api/v1/job-postings", nil).records(t)
	var target string
	for _, p := range postings {
		if p["legacy_id"] == "job_security" {
			target = p["id"].(string)
		}
	}
	if target == "" {
		t.Fatal("job_security posting not found")
	}

	recs := a.do("GET", "/api/v1/job-applications?job_posting_id="+target, nil).records(t)
	if len(recs) != 6 {
		t.Errorf("applications for job_security = %d, want 6", len(recs))
	}
	for _, r := range recs {
		if r["job_posting_id"] != target {
			t.Errorf("filter leaked a record from posting %v", r["job_posting_id"])
		}
	}
}

// An array-valued query parameter means membership, matching store.js's
// `Array.isArray(want) ? want.includes(got)`. api-contract.md §6.
func TestFilterArrayMeansIN(t *testing.T) {
	a := newAPI(t)
	// `assigned` is asked for deliberately: the fixture now carries one, and this
	// filter is literal — it matches the stored value, not the product's rule
	// that an assigned candidate also counts as hired.
	recs := a.do("GET",
		"/api/v1/job-applications?status=hired&status=interview&status=assigned", nil).records(t)
	if len(recs) != 8 {
		t.Errorf("hired+interview+assigned = %d, want 8 (2 hired, 5 interview, 1 assigned)", len(recs))
	}
	for _, r := range recs {
		if s := r["status"].(string); s != "hired" && s != "interview" && s != "assigned" {
			t.Errorf("membership filter leaked status %q", s)
		}
	}
}

// Email columns are citext, so matching is case-insensitive server-side.
// api-contract.md §6.1.
func TestFilterEmailIsCaseInsensitive(t *testing.T) {
	a := newAPI(t)
	lower := a.do("GET", "/api/v1/worker-profiles?email=maria.gonzalez@example.com", nil).records(t)
	upper := a.do("GET", "/api/v1/worker-profiles?email=MARIA.GONZALEZ@EXAMPLE.COM", nil).records(t)
	if len(lower) != 1 {
		t.Fatalf("expected exactly one profile, got %d", len(lower))
	}
	if len(upper) != len(lower) {
		t.Errorf("case-insensitive match failed: %d vs %d", len(upper), len(lower))
	}
}

func TestFilterRejectsUnknownAndUnfilterableFields(t *testing.T) {
	a := newAPI(t)
	if r := a.do("GET", "/api/v1/job-postings?nonsense=1", nil); r.code != http.StatusBadRequest {
		t.Errorf("unknown filter field = %d, want 400", r.code)
	}
	// Arrays are not filterable: store.js compares with === and matches nothing,
	// so supporting containment here would be a silent behaviour change.
	if r := a.do("GET", "/api/v1/job-postings?responsibilities=x", nil); r.code != http.StatusBadRequest {
		t.Errorf("array filter = %d, want 400", r.code)
	}
	if r := a.do("GET", "/api/v1/job-postings?vetting_criteria=x", nil); r.code != http.StatusBadRequest {
		t.Errorf("jsonb filter = %d, want 400", r.code)
	}
}

/* ── Get ────────────────────────────────────────────────────────────────── */

func TestGetAndNotFound(t *testing.T) {
	a := newAPI(t)
	postings := a.do("GET", "/api/v1/job-postings", nil).records(t)
	id := postings[0]["id"].(string)

	r := a.do("GET", "/api/v1/job-postings/"+id, nil)
	if r.code != http.StatusOK {
		t.Fatalf("get = %d, want 200", r.code)
	}
	if r.record(t)["id"] != id {
		t.Error("returned the wrong record")
	}

	missing := a.do("GET", "/api/v1/job-postings/00000000-0000-0000-0000-000000000000", nil)
	if missing.code != http.StatusNotFound {
		t.Errorf("missing record = %d, want 404", missing.code)
	}
	if code := missing.errCode(t); code != "not_found" {
		t.Errorf("error code = %q, want not_found", code)
	}
	// store.js throws "<Entity> <id> not found" using the frontend entity name.
	msg := missing.body["error"].(map[string]any)["message"].(string)
	if want := "JobPosting 00000000-0000-0000-0000-000000000000 not found"; msg != want {
		t.Errorf("message = %q, want %q", msg, want)
	}

	// A malformed id is simply an id that cannot be found.
	if r := a.do("GET", "/api/v1/job-postings/not-a-uuid", nil); r.code != http.StatusNotFound {
		t.Errorf("malformed id = %d, want 404", r.code)
	}
}

/* ── Create ─────────────────────────────────────────────────────────────── */

func TestCreateAppliesDefaultsAndReturnsWholeRecord(t *testing.T) {
	a := newAPI(t)
	r := a.do("POST", "/api/v1/job-postings", map[string]any{"title": "Test Bartender"})
	if r.code != http.StatusCreated {
		t.Fatalf("create = %d, want 201: %#v", r.code, r.body)
	}
	rec := r.record(t)
	if rec["title"] != "Test Bartender" {
		t.Errorf("title = %v", rec["title"])
	}
	// The response is the complete record, defaults included.
	for _, field := range []string{"id", "created_date", "updated_date", "status", "vetting_criteria", "responsibilities"} {
		if _, ok := rec[field]; !ok {
			t.Errorf("created record is missing %s", field)
		}
	}
	if rec["status"] != "draft" {
		t.Errorf("default status = %v, want draft", rec["status"])
	}
	if rec["headcount"] != float64(1) {
		t.Errorf("default headcount = %v, want 1", rec["headcount"])
	}
}

func TestCreateRejectsMissingRequiredAndBlank(t *testing.T) {
	a := newAPI(t)
	r := a.do("POST", "/api/v1/job-postings", map[string]any{})
	if r.code != http.StatusUnprocessableEntity {
		t.Fatalf("missing title = %d, want 422", r.code)
	}
	if code := r.errCode(t); code != "validation_failed" {
		t.Errorf("code = %q, want validation_failed", code)
	}
	if r := a.do("POST", "/api/v1/job-postings", map[string]any{"title": "   "}); r.code != http.StatusUnprocessableEntity {
		t.Errorf("blank title = %d, want 422", r.code)
	}
}

// Unknown fields are rejected, not ignored. Silently dropping them is exactly
// how interview_id, training_outline and score_breakdown would have been lost.
func TestCreateRejectsUnknownFields(t *testing.T) {
	a := newAPI(t)
	r := a.do("POST", "/api/v1/job-postings", map[string]any{"title": "X", "not_a_column": 1})
	if r.code != http.StatusUnprocessableEntity {
		t.Fatalf("unknown field = %d, want 422", r.code)
	}
	details := r.body["error"].(map[string]any)["details"].(map[string]any)
	if details["not_a_column"] == nil {
		t.Errorf("the offending field is not named in details: %#v", details)
	}
}

// Server-owned fields are ignored rather than rejected. api-contract.md §3.1.
func TestCreateIgnoresServerOwnedFields(t *testing.T) {
	a := newAPI(t)
	r := a.do("POST", "/api/v1/job-postings", map[string]any{
		"title":        "Ignore Me",
		"id":           "11111111-1111-1111-1111-111111111111",
		"created_date": "2001-01-01T00:00:00.000Z",
	})
	if r.code != http.StatusCreated {
		t.Fatalf("create = %d, want 201: %#v", r.code, r.body)
	}
	rec := r.record(t)
	if rec["id"] == "11111111-1111-1111-1111-111111111111" {
		t.Error("a client-supplied id was honoured")
	}
	if rec["created_date"] == "2001-01-01T00:00:00.000Z" {
		t.Error("a client-supplied created_date was honoured")
	}
}

func TestCreateRejectsInvalidEnum(t *testing.T) {
	a := newAPI(t)
	r := a.do("POST", "/api/v1/job-postings", map[string]any{"title": "X", "status": "archived"})
	if r.code != http.StatusUnprocessableEntity {
		t.Fatalf("invalid enum = %d, want 422", r.code)
	}
	details := r.body["error"].(map[string]any)["details"].(map[string]any)
	if details["status"] == nil {
		t.Error("details should name the status field")
	}
}

func TestCreateEnforcesForeignKeys(t *testing.T) {
	a := newAPI(t)
	r := a.do("POST", "/api/v1/job-applications", map[string]any{
		"job_posting_id": "00000000-0000-0000-0000-000000000000",
		"applicant_name": "Nobody",
		"email":          "nobody@example.com",
	})
	if r.code != http.StatusUnprocessableEntity {
		t.Fatalf("dangling foreign key = %d, want 422: %#v", r.code, r.body)
	}
}

func TestCreateEnforcesUniqueness(t *testing.T) {
	a := newAPI(t)
	apps := a.do("GET", "/api/v1/job-applications", nil).records(t)
	existing := apps[0]

	r := a.do("POST", "/api/v1/job-applications", map[string]any{
		"job_posting_id": existing["job_posting_id"],
		"applicant_name": "Duplicate",
		"email":          existing["email"],
	})
	if r.code != http.StatusConflict {
		t.Fatalf("duplicate (job_posting_id, email) = %d, want 409: %#v", r.code, r.body)
	}
	if code := r.errCode(t); code != "conflict" {
		t.Errorf("code = %q, want conflict", code)
	}
}

/* ── Update ─────────────────────────────────────────────────────────────── */

// PATCH is a shallow merge: absent keys are untouched, and a supplied object
// REPLACES rather than merging into the stored one. api-contract.md §3.2.
func TestPatchIsShallowMerge(t *testing.T) {
	a := newAPI(t)
	created := a.do("POST", "/api/v1/job-postings", map[string]any{
		"title": "Shallow", "company": "Acme", "location": "Nowhere",
		"responsibilities": []string{"a", "b"},
	}).record(t)
	id := created["id"].(string)

	patched := a.do("PATCH", "/api/v1/job-postings/"+id,
		map[string]any{"location": "Somewhere"}).record(t)

	if patched["location"] != "Somewhere" {
		t.Errorf("location = %v, want Somewhere", patched["location"])
	}
	if patched["company"] != "Acme" {
		t.Errorf("an untouched field changed: company = %v", patched["company"])
	}
	if patched["title"] != "Shallow" {
		t.Errorf("an untouched field changed: title = %v", patched["title"])
	}

	// A nested object is replaced wholesale, not deep-merged. useSubmitChallenge
	// depends on whole arrays being replaced rather than appended to.
	withCriteria := a.do("PATCH", "/api/v1/job-postings/"+id,
		map[string]any{"vetting_criteria": map[string]any{"experience": 30}}).record(t)
	vc := withCriteria["vetting_criteria"].(map[string]any)
	if len(vc) != 1 || vc["experience"] != float64(30) {
		t.Errorf("vetting_criteria was deep-merged, not replaced: %#v", vc)
	}

	// Same for arrays.
	withArray := a.do("PATCH", "/api/v1/job-postings/"+id,
		map[string]any{"responsibilities": []string{"z"}}).record(t)
	resp := withArray["responsibilities"].([]any)
	if len(resp) != 1 || resp[0] != "z" {
		t.Errorf("responsibilities were appended rather than replaced: %#v", resp)
	}
}

func TestPatchUpdatesTimestampAndMissingIs404(t *testing.T) {
	a := newAPI(t)
	created := a.do("POST", "/api/v1/job-postings", map[string]any{"title": "Stamped"}).record(t)
	id := created["id"].(string)

	time.Sleep(5 * time.Millisecond)
	patched := a.do("PATCH", "/api/v1/job-postings/"+id, map[string]any{"title": "Restamped"}).record(t)
	if patched["updated_date"] == created["updated_date"] {
		t.Error("updated_date did not move on PATCH")
	}
	if patched["created_date"] != created["created_date"] {
		t.Error("created_date changed on PATCH")
	}

	missing := a.do("PATCH", "/api/v1/job-postings/00000000-0000-0000-0000-000000000000",
		map[string]any{"title": "Ghost"})
	if missing.code != http.StatusNotFound {
		t.Errorf("patch on a missing record = %d, want 404", missing.code)
	}
}

// The interview_id round trip: the exact write AIInterviewModal.jsx:180 makes.
func TestPatchApplicationInterviewID(t *testing.T) {
	a := newAPI(t)
	apps := a.do("GET", "/api/v1/job-applications?limit=1", nil).records(t)
	interviews := a.do("GET", "/api/v1/ai-interviews", nil).records(t)
	if len(apps) == 0 || len(interviews) == 0 {
		t.Fatal("need a seeded application and interview")
	}
	id := apps[0]["id"].(string)
	interviewID := interviews[0]["id"].(string)

	rec := a.do("PATCH", "/api/v1/job-applications/"+id, map[string]any{
		"status": "interview", "interview_id": interviewID, "ai_score": 81,
	}).record(t)

	if rec["interview_id"] != interviewID {
		t.Errorf("interview_id = %v, want %v", rec["interview_id"], interviewID)
	}
	if rec["status"] != "interview" {
		t.Errorf("status = %v", rec["status"])
	}
	if rec["ai_score"] != float64(81) {
		t.Errorf("ai_score = %v", rec["ai_score"])
	}
}

// The two other reconciliation columns, round-tripped.
func TestPatchTrainingOutlineAndProfileScoreBreakdown(t *testing.T) {
	a := newAPI(t)

	courses := a.do("GET", "/api/v1/courses?limit=1", nil).records(t)
	course := a.do("PATCH", "/api/v1/courses/"+courses[0]["id"].(string), map[string]any{
		"training_outline": []string{"Mise en place", "Service", "Close down"},
	}).record(t)
	outline, ok := course["training_outline"].([]any)
	if !ok || len(outline) != 3 || outline[0] != "Mise en place" {
		t.Errorf("training_outline did not round-trip: %#v", course["training_outline"])
	}

	profiles := a.do("GET", "/api/v1/worker-profiles?limit=1", nil).records(t)
	profile := a.do("PATCH", "/api/v1/worker-profiles/"+profiles[0]["id"].(string), map[string]any{
		"score_breakdown": map[string]any{"reliability": 88, "experience": 71},
	}).record(t)
	sb, ok := profile["score_breakdown"].(map[string]any)
	if !ok || sb["reliability"] != float64(88) {
		t.Errorf("score_breakdown did not round-trip: %#v", profile["score_breakdown"])
	}
}

/* ── Delete ─────────────────────────────────────────────────────────────── */

// DELETE is idempotent and returns { id } whether or not a row went, because
// store.js never throws and both live callers delete inside loops without
// checking. api-contract.md §12.7.
func TestDeleteIsIdempotent(t *testing.T) {
	a := newAPI(t)
	apps := a.do("GET", "/api/v1/job-applications?limit=1", nil).records(t)
	id := apps[0]["id"].(string)

	first := a.do("DELETE", "/api/v1/job-applications/"+id, nil)
	if first.code != http.StatusOK {
		t.Fatalf("delete = %d, want 200", first.code)
	}
	if first.record(t)["id"] != id {
		t.Error("delete did not return the id")
	}

	// Gone, and deleting again still succeeds.
	if r := a.do("GET", "/api/v1/job-applications?limit=500", nil); len(r.records(t)) != 23 {
		t.Errorf("after delete there are %d applications, want 23", len(r.records(t)))
	}
	second := a.do("DELETE", "/api/v1/job-applications/"+id, nil)
	if second.code != http.StatusOK {
		t.Errorf("second delete = %d, want 200 (idempotent)", second.code)
	}
	missing := a.do("DELETE", "/api/v1/job-applications/00000000-0000-0000-0000-000000000000", nil)
	if missing.code != http.StatusOK {
		t.Errorf("delete of a never-existing record = %d, want 200", missing.code)
	}
	malformed := a.do("DELETE", "/api/v1/job-applications/not-a-uuid", nil)
	if malformed.code != http.StatusOK {
		t.Errorf("delete with a malformed id = %d, want 200", malformed.code)
	}
}

/* ── Route surface ──────────────────────────────────────────────────────── */

// The database having a table is never a reason for an endpoint to exist.
func TestUnsupportedOperationsAreNotRouted(t *testing.T) {
	a := newAPI(t)
	postings := a.do("GET", "/api/v1/job-postings", nil).records(t)
	id := postings[0]["id"].(string)

	// Nothing in the frontend deletes a job posting.
	if r := a.do("DELETE", "/api/v1/job-postings/"+id, nil); r.code != http.StatusMethodNotAllowed {
		t.Errorf("DELETE job-postings = %d, want 405", r.code)
	}
	// Shift records are read-only: U1 is unresolved, so there is no write path.
	if r := a.do("POST", "/api/v1/shift-records", map[string]any{}); r.code != http.StatusMethodNotAllowed {
		t.Errorf("POST shift-records = %d, want 405", r.code)
	}
	// Assignments are listed and created, never fetched by id or updated — so
	// no item route exists for them at all, and a wrong method is a 404 rather
	// than a 405 (405 needs the path pattern to exist under another method).
	if r := a.do("PATCH", "/api/v1/assignments/"+id, map[string]any{}); r.code != http.StatusNotFound {
		t.Errorf("PATCH assignments = %d, want 404", r.code)
	}
	// Badge has a table and is seeded, but useBadges has zero consumers.
	if r := a.do("GET", "/api/v1/badges", nil); r.code != http.StatusNotFound {
		t.Errorf("GET badges = %d, want 404 (no route registered)", r.code)
	}
	// The mux's own 404/405 replies are rewritten into the error envelope, so
	// every response from the API is JSON.
	if code := a.do("DELETE", "/api/v1/job-postings/"+id, nil).errCode(t); code != "method_not_allowed" {
		t.Errorf("405 error code = %q, want method_not_allowed", code)
	}
	if code := a.do("GET", "/api/v1/badges", nil).errCode(t); code != "not_found" {
		t.Errorf("404 error code = %q, want not_found", code)
	}
	// Job postings have no filter call site but are still gettable by id.
	if r := a.do("GET", "/api/v1/job-postings/"+id, nil); r.code != http.StatusOK {
		t.Errorf("GET job-postings/{id} = %d, want 200", r.code)
	}
}

/* ── Current user ───────────────────────────────────────────────────────── */

func TestCurrentUserAndPreferences(t *testing.T) {
	a := newAPI(t)

	me := a.do("GET", "/api/v1/me", nil)
	if me.code != http.StatusOK {
		t.Fatalf("GET /me = %d", me.code)
	}
	user := me.record(t)
	if user["email"] != "demo@krow.app" {
		t.Errorf("email = %v, want demo@krow.app", user["email"])
	}
	// krowHooks.js:42 reads user?.preferences straight off this object.
	prefs, ok := user["preferences"].(map[string]any)
	if !ok {
		t.Fatalf("preferences are not embedded in the user: %#v", user)
	}
	if prefs["owliverDefault"] != true {
		t.Errorf("owliverDefault = %v, want true", prefs["owliverDefault"])
	}

	updated := a.do("PATCH", "/api/v1/me", map[string]any{"full_name": "Alex R."}).record(t)
	if updated["full_name"] != "Alex R." {
		t.Errorf("full_name = %v", updated["full_name"])
	}

	// Preferences shallow-merge, and unknown keys land in the extra blob —
	// which is where customSkills and customAgents live.
	merged := a.do("PATCH", "/api/v1/me/preferences", map[string]any{
		"compactDensity": true,
		"customSkills":   []any{map[string]any{"id": "s1"}},
	}).record(t)
	if merged["compactDensity"] != true {
		t.Errorf("compactDensity = %v, want true", merged["compactDensity"])
	}
	if merged["owliverDefault"] != true {
		t.Errorf("an untouched preference changed: owliverDefault = %v", merged["owliverDefault"])
	}
	if merged["customSkills"] == nil {
		t.Error("an arbitrary preference key was not preserved")
	}

	reread := a.do("GET", "/api/v1/me/preferences", nil).record(t)
	if reread["compactDensity"] != true || reread["customSkills"] == nil {
		t.Errorf("preferences did not survive a re-read: %#v", reread)
	}

	if r := a.do("PATCH", "/api/v1/me/preferences", map[string]any{"emailDigest": "yes"}); r.code != http.StatusUnprocessableEntity {
		t.Errorf("non-boolean preference = %d, want 422", r.code)
	}
}

/* ── Organization scoping ───────────────────────────────────────────────── */

// Reads are scoped: a record belonging to another organization is invisible,
// and is a 404 by id rather than a leak.
func TestOrganizationScoping(t *testing.T) {
	a := newAPI(t)
	ctx := t.Context()

	var otherOrg string
	if err := a.h.Pool.QueryRow(ctx,
		`INSERT INTO organizations (name, slug) VALUES ('Other Co', 'other-co') RETURNING id::text`).
		Scan(&otherOrg); err != nil {
		t.Fatalf("create second organization: %v", err)
	}
	var hidden string
	if err := a.h.Pool.QueryRow(ctx,
		`INSERT INTO job_postings (org_id, title) VALUES ($1::uuid, 'Hidden Role') RETURNING id::text`,
		otherOrg).Scan(&hidden); err != nil {
		t.Fatalf("create foreign posting: %v", err)
	}

	for _, r := range a.do("GET", "/api/v1/job-postings?limit=500", nil).records(t) {
		if r["id"] == hidden {
			t.Fatal("a posting from another organization appeared in the list")
		}
	}
	if r := a.do("GET", "/api/v1/job-postings/"+hidden, nil); r.code != http.StatusNotFound {
		t.Errorf("foreign record by id = %d, want 404", r.code)
	}
	if r := a.do("PATCH", "/api/v1/job-postings/"+hidden, map[string]any{"title": "Stolen"}); r.code != http.StatusNotFound {
		t.Errorf("patching a foreign record = %d, want 404", r.code)
	}

	// It is still there — scoping hid it, it did not delete it.
	var still int
	if err := a.h.Pool.QueryRow(ctx,
		`SELECT count(*) FROM job_postings WHERE id = $1::uuid AND title = 'Hidden Role'`, hidden).
		Scan(&still); err != nil {
		t.Fatal(err)
	}
	if still != 1 {
		t.Error("the foreign record was modified or removed")
	}
}

// Courses with a NULL org_id are the shared platform library and must be
// visible to every organization.
func TestPlatformLibraryIsVisible(t *testing.T) {
	a := newAPI(t)
	var shared string
	if err := a.h.Pool.QueryRow(t.Context(),
		`INSERT INTO courses (org_id, title) VALUES (NULL, 'Platform Course') RETURNING id::text`).
		Scan(&shared); err != nil {
		t.Fatalf("insert shared course: %v", err)
	}
	found := false
	for _, r := range a.do("GET", "/api/v1/courses?limit=500", nil).records(t) {
		if r["id"] == shared {
			found = true
		}
	}
	if !found {
		t.Error("a NULL-org course was not visible to the organization")
	}
}

/* ── Representation ─────────────────────────────────────────────────────── */

// Field names and value shapes must match what the frontend has always seen.
func TestRecordRepresentation(t *testing.T) {
	a := newAPI(t)
	rec := a.do("GET", "/api/v1/job-applications?limit=1", nil).records(t)[0]

	if _, ok := rec["id"].(string); !ok {
		t.Errorf("id is %T, want a string", rec["id"])
	}
	created, ok := rec["created_date"].(string)
	if !ok || len(created) != 24 || created[len(created)-1] != 'Z' {
		t.Errorf("created_date = %v; want ISO-8601 with milliseconds", rec["created_date"])
	}
	if _, ok := rec["ai_score"].(float64); !ok {
		t.Errorf("ai_score is %T, want a number", rec["ai_score"])
	}
	if _, ok := rec["skills"].([]any); !ok {
		t.Errorf("skills is %T, want an array", rec["skills"])
	}
	if _, ok := rec["score_breakdown"].(map[string]any); !ok {
		t.Errorf("score_breakdown is %T, want an object", rec["score_breakdown"])
	}
	if _, ok := rec["client_rating"].(float64); !ok {
		t.Errorf("client_rating is %T, want a number", rec["client_rating"])
	}

	staff := a.do("GET", "/api/v1/staff?limit=1", nil).records(t)[0]
	if hire, ok := staff["hire_date"].(string); !ok || len(hire) != 10 {
		t.Errorf("hire_date = %v, want YYYY-MM-DD", staff["hire_date"])
	}
}

func TestHealthEndpoint(t *testing.T) {
	a := newAPI(t)
	r := a.do("GET", "/health", nil)
	if r.code != http.StatusOK {
		t.Fatalf("health = %d, want 200", r.code)
	}
	if r.body["status"] != "ok" {
		t.Errorf("status = %v, want ok", r.body["status"])
	}
	// The body is exactly one field. /health is unauthenticated, so anything
	// added here is added to the public internet.
	if len(r.body) != 1 {
		t.Errorf("the health body has %d fields (%v), want exactly 1", len(r.body), keysOf(r.body))
	}
}

// TestHealthLeaksNoInfrastructure is the assertion that has to survive future
// edits to the handler: whatever else /health says, it must not describe the
// machine it is running on.
//
// It checks the rendered body rather than the struct, because the leak that
// matters is the one a caller can read — a field added to an embedded type, or
// a struct swapped in wholesale, would pass a field-by-field test on
// healthResponse and fail this one.
func TestHealthLeaksNoInfrastructure(t *testing.T) {
	a := newAPI(t)

	rec := httptest.NewRecorder()
	a.handler.ServeHTTP(rec, httptest.NewRequest("GET", "/health", nil))
	body := rec.Body.String()

	if rec.Code != http.StatusOK {
		t.Fatalf("health = %d, want 200", rec.Code)
	}

	// Field names that would each be a disclosure on their own.
	for _, key := range []string{
		"version", "postgres", "database", "schema", "table_count",
		"migration", "applied_migration", "dirty", "error", "env",
		"host", "port", "dsn", "user", "password", "latency",
	} {
		if strings.Contains(strings.ToLower(body), key) {
			t.Errorf("the health response mentions %q:\n%s", key, body)
		}
	}

	// And the values themselves, taken from the live check rather than
	// hardcoded, so this keeps working on a different server or database.
	health := (&db.DB{Pool: a.h.Pool, Schema: "public"}).Check(context.Background())
	if health.Database == "" || health.Version == "" {
		t.Fatal("the internal check returned nothing to compare against")
	}
	for name, secret := range map[string]string{
		"database name":      health.Database,
		"PostgreSQL version": health.Version,
		"schema name":        health.Schema,
	} {
		if strings.Contains(body, secret) {
			t.Errorf("the health response contains the %s:\n%s", name, body)
		}
	}
	// The internal check still gathers all of it — this change moved the
	// audience, it did not remove the diagnostic.
	if !health.Reachable || !health.SchemaPresent || health.TableCount == 0 {
		t.Error("db.Check no longer reports the database detail it used to")
	}
}

// An unreachable database must be reported as unserviceable without saying why:
// the connection error text names the host, port, user and database.
func TestHealthUnavailableSaysNothingAboutWhy(t *testing.T) {
	h := testutil.New(t)
	srv := newServer(t, h, nil)
	// Closing the pool is the fastest honest way to make the database
	// unreachable: every Acquire fails immediately, with no network involved.
	// The harness drops its database over a separate admin connection, so
	// cleanup is unaffected.
	h.Pool.Close()

	rec := httptest.NewRecorder()
	srv.Handler().ServeHTTP(rec, httptest.NewRequest("GET", "/health", nil))

	if rec.Code != http.StatusServiceUnavailable {
		t.Fatalf("health with a dead database = %d, want 503", rec.Code)
	}
	var body map[string]any
	if err := json.Unmarshal(rec.Body.Bytes(), &body); err != nil {
		t.Fatalf("response is not JSON: %s", rec.Body.String())
	}
	if body["status"] != "unavailable" {
		t.Errorf("status = %v, want unavailable", body["status"])
	}
	if len(body) != 1 {
		t.Errorf("the unhealthy body has %d fields (%v), want exactly 1", len(body), keysOf(body))
	}
	if strings.Contains(strings.ToLower(rec.Body.String()), "error") {
		t.Errorf("the unhealthy response carries the connection error:\n%s", rec.Body.String())
	}
}

func keysOf(m map[string]any) []string {
	out := make([]string, 0, len(m))
	for k := range m {
		out = append(out, k)
	}
	sort.Strings(out)
	return out
}

// The build identifier has to be reachable, or "did my deploy land?" has no
// answer. It was reported nowhere: the Dockerfile declared a VERSION arg,
// compose passed it, and it reached no linker flag — so every deployment
// described itself as nothing at all.
//
// Under /api/v1 rather than on /health on purpose: /health is public and
// deliberately withholds its detail from the internet, and a build identifier
// tells an unauthenticated reader exactly which source to go and read.
func TestVersionEndpointReportsTheBuild(t *testing.T) {
	a := newAPI(t)

	r := a.do("GET", "/api/v1/version", nil)
	if r.code != http.StatusOK {
		t.Fatalf("code = %d, want 200", r.code)
	}
	data, _ := r.body["data"].(map[string]any)
	if data == nil {
		t.Fatalf("no data envelope: %v", r.body)
	}
	if v, _ := data["version"].(string); v == "" {
		t.Errorf("version is empty; an unstamped build should still say \"dev\": %v", data)
	}
	if e, _ := data["env"].(string); e == "" {
		t.Errorf("env is empty: %v", data)
	}
	if n, _ := data["endpoints"].(float64); n < 1 {
		t.Errorf("endpoints = %v, want the served route count", data["endpoints"])
	}
}

// It is behind the session like every other /api/v1 route.
func TestVersionEndpointNeedsASession(t *testing.T) {
	a := newAPI(t)
	r := a.doAnon("GET", "/api/v1/version", nil)
	if r.code != http.StatusUnauthorized && r.code != http.StatusForbidden {
		t.Errorf("anonymous GET /api/v1/version = %d, want 401/403", r.code)
	}
}

// An agent author picks capabilities from the real tool set, not a copy of it
// kept in the frontend. A second list would drift, and the failure is silent:
// the author picks a tool that no longer exists and gets an agent that quietly
// cannot do the thing they picked.
func TestToolsCatalogueIsServed(t *testing.T) {
	a := newAPI(t)

	r := a.do("GET", "/api/v1/tools", nil)
	if r.code != http.StatusOK {
		t.Fatalf("code = %d, want 200", r.code)
	}
	list, _ := r.body["data"].([]any)
	if len(list) == 0 {
		t.Fatalf("no tools served: %v", r.body)
	}

	seenWrite := false
	for _, raw := range list {
		tool, _ := raw.(map[string]any)
		name, _ := tool["name"].(string)
		desc, _ := tool["description"].(string)
		effect, _ := tool["effect"].(string)
		if name == "" || desc == "" {
			t.Errorf("a tool has no name or description: %v", tool)
		}
		if effect != "read" && effect != "write" {
			t.Errorf("%s has effect %q, want read or write", name, effect)
		}
		if effect == "write" {
			seenWrite = true
			// An author must be able to see that this one proposes changes.
			if confirm, _ := tool["requiresConfirmation"].(bool); !confirm {
				t.Errorf("%s writes but does not report requiring confirmation", name)
			}
		}
	}
	if !seenWrite {
		t.Error("no write tool in the catalogue; the effect distinction is untested")
	}
}

func TestToolsCatalogueNeedsASession(t *testing.T) {
	a := newAPI(t)
	if r := a.doAnon("GET", "/api/v1/tools", nil); r.code != http.StatusUnauthorized && r.code != http.StatusForbidden {
		t.Errorf("anonymous GET /api/v1/tools = %d, want 401/403", r.code)
	}
}