package runtime_test

import (
	"context"
	"errors"
	"fmt"
	"testing"

	"github.com/krow/krow-backend/go-api/internal/authctx"
	"github.com/krow/krow-backend/go-api/internal/repo"
	"github.com/krow/krow-backend/go-api/internal/runtime"
	"github.com/krow/krow-backend/go-api/internal/testutil"
)

type fixture struct {
	h         *testutil.Harness
	loader    *runtime.Loader
	engine    *runtime.Engine
	defRepo   *repo.DefinitionsRepo
	org1      string
	org2      string
	userA     authctx.Identity
	userB     authctx.Identity
	userOther authctx.Identity
}

func newFixture(t *testing.T) *fixture {
	t.Helper()
	h := testutil.New(t)
	ctx := context.Background()

	var org2 string
	if err := h.Pool.QueryRow(ctx,
		`INSERT INTO organizations (name, slug) VALUES ('Second Org', 'second-org') RETURNING id::text`).
		Scan(&org2); err != nil {
		t.Fatalf("create second org: %v", err)
	}

	var userAID, userBID, userOtherID string
	if err := h.Pool.QueryRow(ctx,
		`INSERT INTO users (org_id, full_name, email, role, status) VALUES ($1::uuid, 'User A', 'user-a@example.test', 'admin', 'active') RETURNING id::text`,
		h.OrgID).Scan(&userAID); err != nil {
		t.Fatalf("create userA: %v", err)
	}
	if err := h.Pool.QueryRow(ctx,
		`INSERT INTO users (org_id, full_name, email, role, status) VALUES ($1::uuid, 'User B', 'user-b@example.test', 'talent', 'active') RETURNING id::text`,
		h.OrgID).Scan(&userBID); err != nil {
		t.Fatalf("create userB: %v", err)
	}
	if err := h.Pool.QueryRow(ctx,
		`INSERT INTO users (org_id, full_name, email, role, status) VALUES ($1::uuid, 'User Other', 'user-other@example.test', 'admin', 'active') RETURNING id::text`,
		org2).Scan(&userOtherID); err != nil {
		t.Fatalf("create userOther: %v", err)
	}

	f := &fixture{
		h:       h,
		loader:  runtime.NewLoader(h.Pool),
		engine:  runtime.NewEngine(h.Pool),
		defRepo: repo.NewDefinitionsRepo(h.Pool),
		org1:    h.OrgID,
		org2:    org2,
		userA: authctx.Identity{
			UserID: userAID,
			OrgID:  h.OrgID,
			Role:   "admin",
			Email:  "user-a@example.test",
		},
		userB: authctx.Identity{
			UserID: userBID,
			OrgID:  h.OrgID,
			Role:   "talent",
			Email:  "user-b@example.test",
		},
		userOther: authctx.Identity{
			UserID: userOtherID,
			OrgID:  org2,
			Role:   "admin",
			Email:  "user-other@example.test",
		},
	}
	return f
}

/* ── 1. Loader Tests ──────────────────────────────────────────────────────── */

func TestRuntimeLoader_Agent(t *testing.T) {
	f := newFixture(t)
	ctx := context.Background()

	// 1. Published org agent
	agentMD := `---
id: talent-scout
name: Talent Scout
description: Discovers matching candidates
status: published
version: 2
pages:
  - candidates
icon: sparkles
reasoning: deep
trigger: manual
webSearch: true
skills:
  - resume-evaluator
subagents:
  - profile-enricher
---

## Instructions
Review candidate profiles with diligence.
`
	rec, err := f.defRepo.InsertAgent(ctx, f.userA, repo.AgentInsertInput{
		DefinitionID: "talent-scout",
		OrgID:        f.org1,
		Visibility:   "organization",
		CreatedBy:    &f.userA.UserID,
		Markdown:     agentMD,
		Status:       "published",
		Version:      2,
		Name:         "Talent Scout",
		Description:  "Discovers matching candidates",
		Pages:        []string{"candidates"},
	})
	if err != nil {
		t.Fatalf("insert agent: %v", err)
	}
	dbUUID := rec["id"].(string)

	// Load by definition_id
	agentByDefID, err := f.loader.LoadAgent(ctx, f.userB, "talent-scout")
	if err != nil {
		t.Fatalf("load agent by definition_id: %v", err)
	}
	if agentByDefID.ID != "talent-scout" || agentByDefID.DatabaseID != dbUUID {
		t.Errorf("agent ID mismatch: %+v", agentByDefID)
	}
	if agentByDefID.Name != "Talent Scout" || agentByDefID.Version != 2 || agentByDefID.Status != "published" {
		t.Errorf("agent fields mismatch: %+v", agentByDefID)
	}
	if agentByDefID.Icon != "sparkles" || agentByDefID.Reasoning != "deep" || !agentByDefID.WebSearch {
		t.Errorf("agent config mismatch: %+v", agentByDefID)
	}
	if len(agentByDefID.Skills) != 1 || agentByDefID.Skills[0] != "resume-evaluator" {
		t.Errorf("agent skills mismatch: %v", agentByDefID.Skills)
	}
	if agentByDefID.Instructions == "" || agentByDefID.RawMarkdown != agentMD {
		t.Errorf("agent markdown/instructions mismatch")
	}

	// Load by UUID
	agentByUUID, err := f.loader.LoadAgent(ctx, f.userA, dbUUID)
	if err != nil {
		t.Fatalf("load agent by UUID: %v", err)
	}
	if agentByUUID.ID != "talent-scout" {
		t.Errorf("agent by UUID ID mismatch: %+v", agentByUUID)
	}

	// Personal agent for User B
	persMD := `---
id: personal-agent
name: Personal Agent
status: draft
version: 1
pages:
  - candidates
---
## Instructions
Personal instructions.
`
	persRec, err := f.defRepo.InsertAgent(ctx, f.userB, repo.AgentInsertInput{
		DefinitionID: "personal-agent",
		OrgID:        f.org1,
		Visibility:   "personal",
		OwnerUserID:  &f.userB.UserID,
		CreatedBy:    &f.userB.UserID,
		Markdown:     persMD,
		Status:       "draft",
		Version:      1,
		Name:         "Personal Agent",
		Pages:        []string{"candidates"},
	})
	if err != nil {
		t.Fatalf("insert personal agent: %v", err)
	}
	persUUID := persRec["id"].(string)

	// Owner (User B) can load personal agent
	persAgent, err := f.loader.LoadAgent(ctx, f.userB, "personal-agent")
	if err != nil {
		t.Fatalf("load own personal agent: %v", err)
	}
	if persAgent.DatabaseID != persUUID {
		t.Errorf("personal agent uuid mismatch: %s != %s", persAgent.DatabaseID, persUUID)
	}

	// Other user in same org (User A) CANNOT load User B's personal agent -> ErrNotFound
	_, err = f.loader.LoadAgent(ctx, f.userA, "personal-agent")
	if !errors.Is(err, runtime.ErrNotFound) {
		t.Errorf("userA loading userB personal agent: got error %v, want ErrNotFound", err)
	}

	// Outsider CANNOT load org agent from org 1 -> ErrNotFound
	_, err = f.loader.LoadAgent(ctx, f.userOther, "talent-scout")
	if !errors.Is(err, runtime.ErrNotFound) {
		t.Errorf("outsider loading org1 agent: got error %v, want ErrNotFound", err)
	}

	// Missing agent -> ErrNotFound
	_, err = f.loader.LoadAgent(ctx, f.userA, "nonexistent-agent")
	if !errors.Is(err, runtime.ErrNotFound) {
		t.Errorf("load nonexistent agent: got %v, want ErrNotFound", err)
	}
}

func TestRuntimeLoader_Skill(t *testing.T) {
	f := newFixture(t)
	ctx := context.Background()

	skillMD := `---
id: resume-evaluator
name: Resume Evaluator
description: Evaluates candidate resume text
status: active
pages:
  - candidates
category: screening
actions:
  - score
  - summarize
triggers:
  - resume
  - cv
prompt: Evaluate the candidate resume thoroughly.
---

# Resume Evaluator Body
Detailed skill instructions.
`
	rec, err := f.defRepo.InsertSkill(ctx, f.userA, repo.SkillInsertInput{
		DefinitionID: "resume-evaluator",
		OrgID:        f.org1,
		Visibility:   "organization",
		CreatedBy:    &f.userA.UserID,
		Markdown:     skillMD,
		Status:       "active",
		Name:         "Resume Evaluator",
		Description:  "Evaluates candidate resume text",
		Pages:        []string{"candidates"},
	})
	if err != nil {
		t.Fatalf("insert skill: %v", err)
	}
	skillUUID := rec["id"].(string)

	// Load by definition_id
	skillByDefID, err := f.loader.LoadSkill(ctx, f.userB, "resume-evaluator")
	if err != nil {
		t.Fatalf("load skill by definition_id: %v", err)
	}
	if skillByDefID.ID != "resume-evaluator" || skillByDefID.DatabaseID != skillUUID {
		t.Errorf("skill ID mismatch: %+v", skillByDefID)
	}
	if skillByDefID.Name != "Resume Evaluator" || skillByDefID.Status != "active" {
		t.Errorf("skill fields mismatch: %+v", skillByDefID)
	}
	if skillByDefID.Category != "screening" || len(skillByDefID.Actions) != 2 || len(skillByDefID.Triggers) != 2 {
		t.Errorf("skill actions/triggers mismatch: %+v", skillByDefID)
	}
	if skillByDefID.Prompt == nil || *skillByDefID.Prompt != "Evaluate the candidate resume thoroughly." {
		t.Errorf("skill prompt mismatch: %v", skillByDefID.Prompt)
	}
	if skillByDefID.RawMarkdown != skillMD {
		t.Errorf("skill raw markdown not verbatim")
	}

	// Load by UUID
	skillByUUID, err := f.loader.LoadSkill(ctx, f.userA, skillUUID)
	if err != nil {
		t.Fatalf("load skill by UUID: %v", err)
	}
	if skillByUUID.ID != "resume-evaluator" {
		t.Errorf("skill by UUID mismatch: %+v", skillByUUID)
	}

	// Missing skill -> ErrNotFound
	_, err = f.loader.LoadSkill(ctx, f.userA, "nonexistent-skill")
	if !errors.Is(err, runtime.ErrNotFound) {
		t.Errorf("missing skill: got %v, want ErrNotFound", err)
	}

	// Cross-org skill -> ErrNotFound
	_, err = f.loader.LoadSkill(ctx, f.userOther, "resume-evaluator")
	if !errors.Is(err, runtime.ErrNotFound) {
		t.Errorf("cross-org skill: got %v, want ErrNotFound", err)
	}
}

/* ── 2. Status Eligibility Tests ─────────────────────────────────────────── */

func TestRuntime_StatusEligibility(t *testing.T) {
	f := newFixture(t)
	ctx := context.Background()

	// 1. Draft Agent
	draftMD := `---
id: draft-agent
name: Draft Agent
status: draft
version: 1
pages:
  - candidates
---
`
	_, _ = f.defRepo.InsertAgent(ctx, f.userA, repo.AgentInsertInput{
		DefinitionID: "draft-agent",
		OrgID:        f.org1,
		Visibility:   "organization",
		CreatedBy:    &f.userA.UserID,
		Markdown:     draftMD,
		Status:       "draft",
		Version:      1,
		Name:         "Draft Agent",
		Pages:        []string{"candidates"},
	})

	_, err := f.loader.LoadExecutableAgent(ctx, f.userA, "draft-agent")
	if !errors.Is(err, runtime.ErrDraftAgent) {
		t.Errorf("draft agent: got %v, want ErrDraftAgent", err)
	}

	// 2. Archived Agent
	archivedMD := `---
id: archived-agent
name: Archived Agent
status: archived
version: 1
pages:
  - candidates
---
`
	_, _ = f.defRepo.InsertAgent(ctx, f.userA, repo.AgentInsertInput{
		DefinitionID: "archived-agent",
		OrgID:        f.org1,
		Visibility:   "organization",
		CreatedBy:    &f.userA.UserID,
		Markdown:     archivedMD,
		Status:       "archived",
		Version:      1,
		Name:         "Archived Agent",
		Pages:        []string{"candidates"},
	})

	_, err = f.loader.LoadExecutableAgent(ctx, f.userA, "archived-agent")
	if !errors.Is(err, runtime.ErrArchivedAgent) {
		t.Errorf("archived agent: got %v, want ErrArchivedAgent", err)
	}

	// 3. Published Agent without dependencies -> Success
	pubMD := `---
id: published-agent
name: Published Agent
status: published
version: 1
pages:
  - candidates
---
`
	_, _ = f.defRepo.InsertAgent(ctx, f.userA, repo.AgentInsertInput{
		DefinitionID: "published-agent",
		OrgID:        f.org1,
		Visibility:   "organization",
		CreatedBy:    &f.userA.UserID,
		Markdown:     pubMD,
		Status:       "published",
		Version:      1,
		Name:         "Published Agent",
		Pages:        []string{"candidates"},
	})

	pubAgent, err := f.loader.LoadExecutableAgent(ctx, f.userA, "published-agent")
	if err != nil {
		t.Fatalf("load published agent: %v", err)
	}
	if pubAgent.Status != "published" {
		t.Errorf("published agent status: %s", pubAgent.Status)
	}

	// 4. Inactive Skill
	inactiveSkillMD := `---
id: inactive-skill
name: Inactive Skill
status: inactive
pages:
  - candidates
---
`
	_, _ = f.defRepo.InsertSkill(ctx, f.userA, repo.SkillInsertInput{
		DefinitionID: "inactive-skill",
		OrgID:        f.org1,
		Visibility:   "organization",
		CreatedBy:    &f.userA.UserID,
		Markdown:     inactiveSkillMD,
		Status:       "inactive",
		Name:         "Inactive Skill",
		Pages:        []string{"candidates"},
	})

	_, err = f.loader.LoadExecutableSkill(ctx, f.userA, "inactive-skill")
	if !errors.Is(err, runtime.ErrInactiveSkill) {
		t.Errorf("inactive skill: got %v, want ErrInactiveSkill", err)
	}

	// 5. Active Skill -> Success
	activeSkillMD := `---
id: active-skill
name: Active Skill
status: active
pages:
  - candidates
---
`
	_, _ = f.defRepo.InsertSkill(ctx, f.userA, repo.SkillInsertInput{
		DefinitionID: "active-skill",
		OrgID:        f.org1,
		Visibility:   "organization",
		CreatedBy:    &f.userA.UserID,
		Markdown:     activeSkillMD,
		Status:       "active",
		Name:         "Active Skill",
		Pages:        []string{"candidates"},
	})

	activeSkill, err := f.loader.LoadExecutableSkill(ctx, f.userA, "active-skill")
	if err != nil {
		t.Fatalf("load active skill: %v", err)
	}
	if activeSkill.Status != "active" {
		t.Errorf("active skill status: %s", activeSkill.Status)
	}
}

/* ── 3. Version Semantics Tests ──────────────────────────────────────────── */

func TestRuntime_VersionSemantics(t *testing.T) {
	f := newFixture(t)
	ctx := context.Background()

	v5MD := `---
id: v5-agent
name: Version 5 Agent
version: 5
status: published
pages:
  - candidates
---
`
	_, err := f.defRepo.InsertAgent(ctx, f.userA, repo.AgentInsertInput{
		DefinitionID: "v5-agent",
		OrgID:        f.org1,
		Visibility:   "organization",
		CreatedBy:    &f.userA.UserID,
		Markdown:     v5MD,
		Status:       "published",
		Version:      5,
		Name:         "Version 5 Agent",
		Pages:        []string{"candidates"},
	})
	if err != nil {
		t.Fatalf("insert v5 agent: %v", err)
	}

	agent, err := f.loader.LoadAgent(ctx, f.userA, "v5-agent")
	if err != nil {
		t.Fatalf("load v5 agent: %v", err)
	}
	if agent.Version != 5 {
		t.Errorf("agent version = %d, want 5", agent.Version)
	}
}

/* ── 4. Dependency Resolution Tests ──────────────────────────────────────── */

func TestRuntime_DependencyResolution(t *testing.T) {
	f := newFixture(t)
	ctx := context.Background()

	// 1. Create active skill 1
	skill1MD := `---
id: skill-one
name: Skill One
status: active
pages:
  - candidates
---
`
	_, _ = f.defRepo.InsertSkill(ctx, f.userA, repo.SkillInsertInput{
		DefinitionID: "skill-one",
		OrgID:        f.org1,
		Visibility:   "organization",
		CreatedBy:    &f.userA.UserID,
		Markdown:     skill1MD,
		Status:       "active",
		Name:         "Skill One",
		Pages:        []string{"candidates"},
	})

	// 2. Create active skill 2 (personal for userB)
	skill2MD := `---
id: skill-two
name: Skill Two
status: active
pages:
  - candidates
---
`
	_, _ = f.defRepo.InsertSkill(ctx, f.userB, repo.SkillInsertInput{
		DefinitionID: "skill-two",
		OrgID:        f.org1,
		Visibility:   "personal",
		OwnerUserID:  &f.userB.UserID,
		CreatedBy:    &f.userB.UserID,
		Markdown:     skill2MD,
		Status:       "active",
		Name:         "Skill Two",
		Pages:        []string{"candidates"},
	})

	// 3. Create inactive skill 3
	skill3MD := `---
id: skill-inactive
name: Skill Inactive
status: inactive
pages:
  - candidates
---
`
	_, _ = f.defRepo.InsertSkill(ctx, f.userA, repo.SkillInsertInput{
		DefinitionID: "skill-inactive",
		OrgID:        f.org1,
		Visibility:   "organization",
		CreatedBy:    &f.userA.UserID,
		Markdown:     skill3MD,
		Status:       "inactive",
		Name:         "Skill Inactive",
		Pages:        []string{"candidates"},
	})

	// Agent with valid and duplicate dependencies
	validDepMD := `---
id: dep-agent
name: Dependency Agent
status: published
version: 1
pages:
  - candidates
skills:
  - skill-one
  - skill-two
  - skill-one
---
`
	_, _ = f.defRepo.InsertAgent(ctx, f.userB, repo.AgentInsertInput{
		DefinitionID: "dep-agent",
		OrgID:        f.org1,
		Visibility:   "personal",
		OwnerUserID:  &f.userB.UserID,
		CreatedBy:    &f.userB.UserID,
		Markdown:     validDepMD,
		Status:       "published",
		Version:      1,
		Name:         "Dependency Agent",
		Pages:        []string{"candidates"},
	})

	// User B resolves dep-agent: sees skill-one (org) and skill-two (personal), deduplicates skill-one
	loadedAgent, err := f.loader.LoadExecutableAgent(ctx, f.userB, "dep-agent")
	if err != nil {
		t.Fatalf("load executable agent with deps: %v", err)
	}
	if len(loadedAgent.ResolvedSkills) != 2 {
		t.Fatalf("expected 2 resolved skills (deduplicated), got %d", len(loadedAgent.ResolvedSkills))
	}
	if loadedAgent.ResolvedSkills[0].ID != "skill-one" || loadedAgent.ResolvedSkills[1].ID != "skill-two" {
		t.Errorf("resolved skill IDs mismatch: %v, %v", loadedAgent.ResolvedSkills[0].ID, loadedAgent.ResolvedSkills[1].ID)
	}

	// Agent with missing dependency
	missingDepMD := `---
id: missing-dep-agent
name: Missing Dep Agent
status: published
version: 1
pages:
  - candidates
skills:
  - nonexistent-skill
---
`
	_, _ = f.defRepo.InsertAgent(ctx, f.userA, repo.AgentInsertInput{
		DefinitionID: "missing-dep-agent",
		OrgID:        f.org1,
		Visibility:   "organization",
		CreatedBy:    &f.userA.UserID,
		Markdown:     missingDepMD,
		Status:       "published",
		Version:      1,
		Name:         "Missing Dep Agent",
		Pages:        []string{"candidates"},
	})

	_, err = f.loader.LoadExecutableAgent(ctx, f.userA, "missing-dep-agent")
	if !errors.Is(err, runtime.ErrDependencyMissing) {
		t.Errorf("missing dep agent: got %v, want ErrDependencyMissing", err)
	}

	// Agent with inactive dependency
	inactiveDepMD := `---
id: inactive-dep-agent
name: Inactive Dep Agent
status: published
version: 1
pages:
  - candidates
skills:
  - skill-inactive
---
`
	_, _ = f.defRepo.InsertAgent(ctx, f.userA, repo.AgentInsertInput{
		DefinitionID: "inactive-dep-agent",
		OrgID:        f.org1,
		Visibility:   "organization",
		CreatedBy:    &f.userA.UserID,
		Markdown:     inactiveDepMD,
		Status:       "published",
		Version:      1,
		Name:         "Inactive Dep Agent",
		Pages:        []string{"candidates"},
	})

	_, err = f.loader.LoadExecutableAgent(ctx, f.userA, "inactive-dep-agent")
	if !errors.Is(err, runtime.ErrDependencyInactive) {
		t.Errorf("inactive dep agent: got %v, want ErrDependencyInactive", err)
	}

	// Agent with cross-org dependency: outsider creates agent referencing org1's skill
	outsiderAgentMD := `---
id: outsider-agent
name: Outsider Agent
status: published
version: 1
pages:
  - candidates
skills:
  - skill-one
---
`
	_, _ = f.defRepo.InsertAgent(ctx, f.userOther, repo.AgentInsertInput{
		DefinitionID: "outsider-agent",
		OrgID:        f.org2,
		Visibility:   "organization",
		CreatedBy:    &f.userOther.UserID,
		Markdown:     outsiderAgentMD,
		Status:       "published",
		Version:      1,
		Name:         "Outsider Agent",
		Pages:        []string{"candidates"},
	})

	_, err = f.loader.LoadExecutableAgent(ctx, f.userOther, "outsider-agent")
	if !errors.Is(err, runtime.ErrDependencyMissing) {
		t.Errorf("outsider cross-org dep: got %v, want ErrDependencyMissing", err)
	}
}

/* ── 5. Executor Boundary Tests ──────────────────────────────────────────── */

type testEchoExecutor struct {
	lastAgent *runtime.Agent
	lastInput runtime.ExecutionInput
}

func (e *testEchoExecutor) ExecuteAgent(_ context.Context, agent *runtime.Agent, input runtime.ExecutionInput) (*runtime.ExecutionResult, error) {
	e.lastAgent = agent
	e.lastInput = input
	return &runtime.ExecutionResult{
		Success:      true,
		Output:       fmt.Sprintf("executed %s with %s", agent.Name, input.Input),
		AgentID:      agent.ID,
		AgentVersion: agent.Version,
	}, nil
}

func (e *testEchoExecutor) ExecuteSkill(_ context.Context, skill *runtime.Skill, input runtime.ExecutionInput) (*runtime.ExecutionResult, error) {
	return &runtime.ExecutionResult{
		Success: true,
		Output:  fmt.Sprintf("executed skill %s", skill.Name),
	}, nil
}

func TestRuntime_ExecutorBoundary(t *testing.T) {
	f := newFixture(t)
	ctx := context.Background()

	pubMD := `---
id: exec-agent
name: Exec Agent
status: published
version: 1
pages:
  - candidates
---
`
	_, _ = f.defRepo.InsertAgent(ctx, f.userA, repo.AgentInsertInput{
		DefinitionID: "exec-agent",
		OrgID:        f.org1,
		Visibility:   "organization",
		CreatedBy:    &f.userA.UserID,
		Markdown:     pubMD,
		Status:       "published",
		Version:      1,
		Name:         "Exec Agent",
		Pages:        []string{"candidates"},
	})

	// 1. Default engine without configured executor returns ErrExecutorUnavailable
	res, err := f.engine.RunAgent(ctx, f.userA, "exec-agent", runtime.ExecutionInput{
		Identity: f.userA,
		Input:    "Hello agent",
	})
	if !errors.Is(err, runtime.ErrExecutorUnavailable) {
		t.Errorf("default engine run agent: got %v, want ErrExecutorUnavailable", err)
	}
	if res.Success {
		t.Errorf("default engine must not succeed without executor")
	}

	// 2. Custom executor plugged in
	echo := &testEchoExecutor{}
	customEngine := runtime.NewEngine(f.h.Pool, runtime.WithAgentExecutor(echo), runtime.WithSkillExecutor(echo))

	resCustom, err := customEngine.RunAgent(ctx, f.userA, "exec-agent", runtime.ExecutionInput{
		Identity: f.userA,
		Input:    "Hello agent",
	})
	if err != nil {
		t.Fatalf("custom engine run agent failed: %v", err)
	}
	if !resCustom.Success || resCustom.Output != "executed Exec Agent with Hello agent" {
		t.Errorf("custom executor output mismatch: %+v", resCustom)
	}
	if echo.lastAgent.ID != "exec-agent" || echo.lastInput.Input != "Hello agent" {
		t.Errorf("executor received incorrect arguments: agent=%v, input=%v", echo.lastAgent, echo.lastInput)
	}
}

func TestRuntime_PersonalSkillShadowing(t *testing.T) {
	f := newFixture(t)
	ctx := context.Background()

	// Org skill
	orgSkillMD := `---
id: shadow-skill
name: Org Shadow Skill
status: active
pages:
  - candidates
---
`
	_, _ = f.defRepo.InsertSkill(ctx, f.userA, repo.SkillInsertInput{
		DefinitionID: "shadow-skill",
		OrgID:        f.org1,
		Visibility:   "organization",
		CreatedBy:    &f.userA.UserID,
		Markdown:     orgSkillMD,
		Status:       "active",
		Name:         "Org Shadow Skill",
		Pages:        []string{"candidates"},
	})

	// User B's personal skill with the SAME definition_id
	persSkillMD := `---
id: shadow-skill
name: User B Personal Shadow Skill
status: active
pages:
  - candidates
---
`
	persRec, _ := f.defRepo.InsertSkill(ctx, f.userB, repo.SkillInsertInput{
		DefinitionID: "shadow-skill",
		OrgID:        f.org1,
		Visibility:   "personal",
		OwnerUserID:  &f.userB.UserID,
		CreatedBy:    &f.userB.UserID,
		Markdown:     persSkillMD,
		Status:       "active",
		Name:         "User B Personal Shadow Skill",
		Pages:        []string{"candidates"},
	})
	persUUID := persRec["id"].(string)

	// When User A loads shadow-skill -> gets Org Shadow Skill
	skillA, err := f.loader.LoadSkill(ctx, f.userA, "shadow-skill")
	if err != nil {
		t.Fatalf("userA load shadow skill: %v", err)
	}
	if skillA.Name != "Org Shadow Skill" {
		t.Errorf("userA got %s, want Org Shadow Skill", skillA.Name)
	}

	// When User B loads shadow-skill -> gets User B Personal Shadow Skill (shadow precedence)
	skillB, err := f.loader.LoadSkill(ctx, f.userB, "shadow-skill")
	if err != nil {
		t.Fatalf("userB load shadow skill: %v", err)
	}
	if skillB.Name != "User B Personal Shadow Skill" || skillB.DatabaseID != persUUID {
		t.Errorf("userB got %s, want User B Personal Shadow Skill", skillB.Name)
	}
}

func TestRuntime_MalformedMarkdown(t *testing.T) {
	f := newFixture(t)
	ctx := context.Background()

	// Broken YAML
	brokenMD := `---
id: [broken-id
name: Invalid
---
`
	_, _ = f.h.Pool.Exec(ctx, `INSERT INTO agent_definitions (definition_id, org_id, visibility, created_by, markdown, status, version, name, description, pages)
		VALUES ('broken-agent', $1::uuid, 'organization', $2::uuid, $3::text, 'published', 1, 'Broken', '', ARRAY['candidates'])`,
		f.org1, f.userA.UserID, brokenMD)

	_, err := f.loader.LoadAgent(ctx, f.userA, "broken-agent")
	if !errors.Is(err, runtime.ErrInvalidDefinition) {
		t.Errorf("load broken agent: got %v, want ErrInvalidDefinition", err)
	}
}

func TestRuntime_SkillExecution(t *testing.T) {
	f := newFixture(t)
	ctx := context.Background()

	skillMD := `---
id: run-skill
name: Runnable Skill
status: active
pages:
  - candidates
---
`
	_, _ = f.defRepo.InsertSkill(ctx, f.userA, repo.SkillInsertInput{
		DefinitionID: "run-skill",
		OrgID:        f.org1,
		Visibility:   "organization",
		CreatedBy:    &f.userA.UserID,
		Markdown:     skillMD,
		Status:       "active",
		Name:         "Runnable Skill",
		Pages:        []string{"candidates"},
	})

	// Default engine
	res, err := f.engine.RunSkill(ctx, f.userA, "run-skill", runtime.ExecutionInput{
		Identity: f.userA,
		Input:    "skill input",
	})
	if !errors.Is(err, runtime.ErrExecutorUnavailable) {
		t.Errorf("default engine run skill: got %v, want ErrExecutorUnavailable", err)
	}
	if res.Success {
		t.Errorf("default engine run skill must not succeed")
	}

	// Custom executor
	echo := &testEchoExecutor{}
	customEngine := runtime.NewEngine(f.h.Pool, runtime.WithSkillExecutor(echo))
	resCustom, err := customEngine.RunSkill(ctx, f.userA, "run-skill", runtime.ExecutionInput{
		Identity: f.userA,
	})
	if err != nil {
		t.Fatalf("custom engine run skill failed: %v", err)
	}
	if !resCustom.Success || resCustom.Output != "executed skill Runnable Skill" {
		t.Errorf("custom skill output mismatch: %+v", resCustom)
	}
}