package api

import (
	"net/http"
	"strings"
	"testing"
)

func TestVisitorRefRoundTrips(t *testing.T) {
	for _, n := range []int64{1, 42, 999999} {
		ref := VisitorRef(n)
		got, ok := ParseVisitorRef(ref)
		if !ok || got != n {
			t.Fatalf("VisitorRef(%d) = %q, parsed back as (%d, %v)", n, ref, got, ok)
		}
	}
	if got := VisitorRef(0); got != "" {
		t.Fatalf("an unnumbered visitor must render as no reference, got %q", got)
	}
}

// A shop assistant reading "Visitor 42" off a screen types 42. Refusing that
// teaches them the field is unreliable, so bare digits are accepted - and there
// is nothing for them to collide with, because a uuid is checked first and is
// never all digits.
func TestVisitorRefAcceptsWhatSomebodyWouldActuallyType(t *testing.T) {
	for _, in := range []string{"V-42", "v-42", "42", " V-42 "} {
		n, ok := ParseVisitorRef(in)
		if !ok || n != 42 {
			t.Fatalf("ParseVisitorRef(%q) = (%d, %v), want 42", in, n, ok)
		}
	}
	for _, in := range []string{"", "V-", "V-0", "-1", "V-x", "abc", "4 2",
		"3446ec35-2c1f-4c8e-9a77-0d1e2f3a4b5c"} {
		if _, ok := ParseVisitorRef(in); ok {
			t.Fatalf("ParseVisitorRef(%q) accepted a reference it should not", in)
		}
	}
}

func TestLooksLikeNameRejectsJunkBeforeItReachesSQL(t *testing.T) {
	for _, ok := range []string{"chennai", "Office1", "cam_2", "a.b-c"} {
		if !looksLikeName(ok) {
			t.Fatalf("%q should be a usable name", ok)
		}
	}
	for _, bad := range []string{"", "a b", "a/b", "a'b", "../etc", "%", string(make([]byte, 65))} {
		if looksLikeName(bad) {
			t.Fatalf("%q should not reach a query", bad)
		}
	}
}

// The point of the whole scheme: a customer is addressable by the number staff
// read on screen, and the uuid that clients already stored keeps working.
func TestACustomerIsReachableByNumberAndByUUID(t *testing.T) {
	const id = "3446ec35-2c1f-4c8e-9a77-0d1e2f3a4b5c"
	srv, fs := newServer(t)
	seedUser(fs)
	fs.visitors = []Customer{{ID: id, Ref: "V-42", Label: "Visitor 42"}}
	fs.history = []VisitRow{{Site: "Chennai"}}
	tok := login(t, srv, "manager@acme.com", "correct horse battery").Token

	for _, path := range []string{"/api/visitors/" + id + "/history",
		"/api/visitors/V-42/history", "/api/visitors/42/history"} {
		rec := do(t, srv, http.MethodGet, path, tok, nil)
		if rec.Code != http.StatusOK {
			t.Fatalf("GET %s = %d, want 200", path, rec.Code)
		}
	}
}

// A reference that names nobody is 404 on a path, and a filter that names no
// shop is 400 on a query string. The difference matters: `/api/visits` answered
// fine and what was wrong was the filter, so a 404 there would send somebody
// looking for a missing arrivals feed.
func TestAnUnknownReferenceIs404OnAPathAnd400OnAFilter(t *testing.T) {
	srv, fs := newServer(t)
	seedUser(fs)
	tok := login(t, srv, "manager@acme.com", "correct horse battery").Token

	rec := do(t, srv, http.MethodGet, "/api/visitors/V-999/history", tok, nil)
	if rec.Code != http.StatusNotFound {
		t.Fatalf("unknown customer = %d, want 404", rec.Code)
	}
	rec = do(t, srv, http.MethodGet, "/api/visits?site=nowhere", tok, nil)
	if rec.Code != http.StatusBadRequest {
		t.Fatalf("unknown shop filter = %d, want 400", rec.Code)
	}
}

// Reports have always taken `site` and the arrivals feed `site_id`. Both work
// everywhere now, because an unknown query parameter is silently ignored - so
// getting it the wrong way round returned the whole estate rather than an
// error, which is a wrong number nobody would question.
func TestBothSiteParameterNamesAreAccepted(t *testing.T) {
	srv, fs := newServer(t)
	seedUser(fs)
	fs.sites = []SiteHealth{{SiteID: "11111111-1111-4111-8111-111111111111", Slug: "chennai"}}
	tok := login(t, srv, "manager@acme.com", "correct horse battery").Token

	for _, q := range []string{"site=chennai", "site_id=chennai"} {
		fs.arrivalQ = ArrivalQuery{}
		if rec := do(t, srv, http.MethodGet, "/api/visits?"+q, tok, nil); rec.Code != http.StatusOK {
			t.Fatalf("GET /api/visits?%s = %d", q, rec.Code)
		}
		if got := fs.arrivalQ.SiteID; got != "11111111-1111-4111-8111-111111111111" {
			t.Fatalf("%s resolved to %q", q, got)
		}
	}
}

// An arrival names its shop three ways, and the one a client can filter by must
// be among them. Reading "TeNext Chennai" off a row and then having no way to
// ask for that shop except by uuid is the exact gap the reference scheme
// exists to close.
func TestAnArrivalCarriesTheShopReferenceItCanBeFilteredBy(t *testing.T) {
	srv, fs := newServer(t)
	seedUser(fs)
	fs.arrivals = []Arrival{{
		VisitID: "c64dc53f-c7f0-4e61-a3b4-9a230f52b3a3", Seq: 265,
		SiteID: "7c9bb456-e0c6-436d-ba01-5d6cc4e3f466",
		Site:   "TeNext Chennai", SiteSlug: "chennai",
	}}
	tok := login(t, srv, "manager@acme.com", "correct horse battery").Token

	rec := do(t, srv, http.MethodGet, "/api/visits", tok, nil)
	if rec.Code != http.StatusOK {
		t.Fatalf("got %d: %s", rec.Code, rec.Body.String())
	}
	body := rec.Body.String()
	if !strings.Contains(body, `"site_slug":"chennai"`) {
		t.Fatalf("an arrival must carry the shop's reference: %s", body)
	}

	// seq is a plain bigserial, so it counts every visit on the PLATFORM. It
	// must not travel: that is the total footfall of every customer we have,
	// on every row of every tenant's feed.
	if strings.Contains(body, `"seq"`) {
		t.Fatalf("the platform-wide visit counter leaked into the feed: %s", body)
	}
}