package polecat

import (
	"os"
	"os/exec"
	"path/filepath"
	"testing"

	"github.com/steveyegge/gastown/internal/git"
	"github.com/steveyegge/gastown/internal/rig"
)

func TestStateIsActive(t *testing.T) {
	tests := []struct {
		state  State
		active bool
	}{
		{StateWorking, true},
		{StateDone, false},
		{StateStuck, false},
		// Legacy active state is treated as active
		{StateActive, true},
	}

	for _, tt := range tests {
		if got := tt.state.IsActive(); got != tt.active {
			t.Errorf("%s.IsActive() = %v, want %v", tt.state, got, tt.active)
		}
	}
}

func TestStateIsWorking(t *testing.T) {
	tests := []struct {
		state   State
		working bool
	}{
		{StateActive, false},
		{StateWorking, true},
		{StateDone, false},
		{StateStuck, false},
	}

	for _, tt := range tests {
		if got := tt.state.IsWorking(); got != tt.working {
			t.Errorf("%s.IsWorking() = %v, want %v", tt.state, got, tt.working)
		}
	}
}

func TestPolecatSummary(t *testing.T) {
	p := &Polecat{
		Name:  "Toast",
		State: StateWorking,
		Issue: "gt-abc",
	}

	summary := p.Summary()
	if summary.Name != "Toast" {
		t.Errorf("Name = %q, want Toast", summary.Name)
	}
	if summary.State != StateWorking {
		t.Errorf("State = %v, want StateWorking", summary.State)
	}
	if summary.Issue != "gt-abc" {
		t.Errorf("Issue = %q, want gt-abc", summary.Issue)
	}
}

func TestListEmpty(t *testing.T) {
	root := t.TempDir()
	r := &rig.Rig{
		Name: "test-rig",
		Path: root,
	}
	m := NewManager(r, git.NewGit(root))

	polecats, err := m.List()
	if err != nil {
		t.Fatalf("List: %v", err)
	}
	if len(polecats) != 0 {
		t.Errorf("polecats count = %d, want 0", len(polecats))
	}
}

func TestGetNotFound(t *testing.T) {
	root := t.TempDir()
	r := &rig.Rig{
		Name: "test-rig",
		Path: root,
	}
	m := NewManager(r, git.NewGit(root))

	_, err := m.Get("nonexistent")
	if err != ErrPolecatNotFound {
		t.Errorf("Get = %v, want ErrPolecatNotFound", err)
	}
}

func TestRemoveNotFound(t *testing.T) {
	root := t.TempDir()
	r := &rig.Rig{
		Name: "test-rig",
		Path: root,
	}
	m := NewManager(r, git.NewGit(root))

	err := m.Remove("nonexistent", false)
	if err != ErrPolecatNotFound {
		t.Errorf("Remove = %v, want ErrPolecatNotFound", err)
	}
}

func TestPolecatDir(t *testing.T) {
	r := &rig.Rig{
		Name: "test-rig",
		Path: "/home/user/ai/test-rig",
	}
	m := NewManager(r, git.NewGit(r.Path))

	dir := m.polecatDir("Toast")
	expected := "/home/user/ai/test-rig/polecats/Toast"
	if dir != expected {
		t.Errorf("polecatDir = %q, want %q", dir, expected)
	}
}

func TestAssigneeID(t *testing.T) {
	r := &rig.Rig{
		Name: "test-rig",
		Path: "/home/user/ai/test-rig",
	}
	m := NewManager(r, git.NewGit(r.Path))

	id := m.assigneeID("Toast")
	expected := "test-rig/Toast"
	if id != expected {
		t.Errorf("assigneeID = %q, want %q", id, expected)
	}
}

// Note: State persistence tests removed - state is now derived from beads assignee field.
// Integration tests should verify beads-based state management.

func TestGetReturnsWorkingWithoutBeads(t *testing.T) {
	// When beads is not available, Get should return StateWorking
	// (assume the polecat is doing something if it exists)
	//
	// Skip if bd is installed - the test assumes bd is unavailable, but when bd
	// is present it queries beads and returns actual state instead of defaulting.
	if _, err := exec.LookPath("bd"); err == nil {
		t.Skip("skipping: bd is installed, test requires bd to be unavailable")
	}

	root := t.TempDir()
	polecatDir := filepath.Join(root, "polecats", "Test")
	if err := os.MkdirAll(polecatDir, 0755); err != nil {
		t.Fatalf("mkdir: %v", err)
	}

	// Create mayor/rig directory for beads (but no actual beads)
	mayorRigDir := filepath.Join(root, "mayor", "rig")
	if err := os.MkdirAll(mayorRigDir, 0755); err != nil {
		t.Fatalf("mkdir mayor/rig: %v", err)
	}

	r := &rig.Rig{
		Name: "test-rig",
		Path: root,
	}
	m := NewManager(r, git.NewGit(root))

	// Get should return polecat with StateWorking (assume active if beads unavailable)
	polecat, err := m.Get("Test")
	if err != nil {
		t.Fatalf("Get: %v", err)
	}

	if polecat.Name != "Test" {
		t.Errorf("Name = %q, want Test", polecat.Name)
	}
	if polecat.State != StateWorking {
		t.Errorf("State = %v, want StateWorking (beads not available)", polecat.State)
	}
}

func TestListWithPolecats(t *testing.T) {
	root := t.TempDir()

	// Create some polecat directories (state is now derived from beads, not state files)
	for _, name := range []string{"Toast", "Cheedo"} {
		polecatDir := filepath.Join(root, "polecats", name)
		if err := os.MkdirAll(polecatDir, 0755); err != nil {
			t.Fatalf("mkdir: %v", err)
		}
	}
	if err := os.MkdirAll(filepath.Join(root, "polecats", ".claude"), 0755); err != nil {
		t.Fatalf("mkdir .claude: %v", err)
	}
	// Create mayor/rig for beads path
	mayorRig := filepath.Join(root, "mayor", "rig")
	if err := os.MkdirAll(mayorRig, 0755); err != nil {
		t.Fatalf("mkdir mayor/rig: %v", err)
	}

	r := &rig.Rig{
		Name: "test-rig",
		Path: root,
	}
	m := NewManager(r, git.NewGit(root))

	polecats, err := m.List()
	if err != nil {
		t.Fatalf("List: %v", err)
	}
	if len(polecats) != 2 {
		t.Errorf("polecats count = %d, want 2", len(polecats))
	}
}

// Note: TestSetState, TestAssignIssue, and TestClearIssue were removed.
// These operations now require a running beads instance and are tested
// via integration tests. The unit tests here focus on testing the basic
// polecat lifecycle operations that don't require beads.

func TestSetStateWithoutBeads(t *testing.T) {
	// SetState should not error when beads is not available
	root := t.TempDir()
	polecatDir := filepath.Join(root, "polecats", "Test")
	if err := os.MkdirAll(polecatDir, 0755); err != nil {
		t.Fatalf("mkdir: %v", err)
	}
	// Create mayor/rig for beads path
	mayorRig := filepath.Join(root, "mayor", "rig")
	if err := os.MkdirAll(mayorRig, 0755); err != nil {
		t.Fatalf("mkdir mayor/rig: %v", err)
	}

	r := &rig.Rig{
		Name: "test-rig",
		Path: root,
	}
	m := NewManager(r, git.NewGit(root))

	// SetState should succeed (no-op when no issue assigned)
	err := m.SetState("Test", StateActive)
	if err != nil {
		t.Errorf("SetState: %v (expected no error when no beads/issue)", err)
	}
}

func TestClearIssueWithoutAssignment(t *testing.T) {
	// ClearIssue should not error when no issue is assigned
	root := t.TempDir()
	polecatDir := filepath.Join(root, "polecats", "Test")
	if err := os.MkdirAll(polecatDir, 0755); err != nil {
		t.Fatalf("mkdir: %v", err)
	}
	// Create mayor/rig for beads path
	mayorRig := filepath.Join(root, "mayor", "rig")
	if err := os.MkdirAll(mayorRig, 0755); err != nil {
		t.Fatalf("mkdir mayor/rig: %v", err)
	}

	r := &rig.Rig{
		Name: "test-rig",
		Path: root,
	}
	m := NewManager(r, git.NewGit(root))

	// ClearIssue should succeed even when no issue assigned
	err := m.ClearIssue("Test")
	if err != nil {
		t.Errorf("ClearIssue: %v (expected no error when no assignment)", err)
	}
}

// NOTE: TestInstallCLAUDETemplate tests were removed.
// We no longer write CLAUDE.md to worktrees - Gas Town context is injected
// ephemerally via SessionStart hook (gt prime) to prevent leaking internal
// architecture into project repos.

func TestAddWithOptions_HasAgentsMD(t *testing.T) {
	// This test verifies that AGENTS.md exists in polecat worktrees after creation.
	// AGENTS.md is critical for polecats to "land the plane" properly.

	root := t.TempDir()

	// Create mayor/rig directory structure (this acts as repo base when no .repo.git)
	mayorRig := filepath.Join(root, "mayor", "rig")
	if err := os.MkdirAll(mayorRig, 0755); err != nil {
		t.Fatalf("mkdir mayor/rig: %v", err)
	}

	// Initialize git repo in mayor/rig
	cmd := exec.Command("git", "init")
	cmd.Dir = mayorRig
	if out, err := cmd.CombinedOutput(); err != nil {
		t.Fatalf("git init: %v\n%s", err, out)
	}

	// Create AGENTS.md with test content
	agentsMDContent := []byte("# AGENTS.md\n\nTest content for polecats.\n")
	agentsMDPath := filepath.Join(mayorRig, "AGENTS.md")
	if err := os.WriteFile(agentsMDPath, agentsMDContent, 0644); err != nil {
		t.Fatalf("write AGENTS.md: %v", err)
	}

	// Commit AGENTS.md so it's part of the repo
	mayorGit := git.NewGit(mayorRig)
	if err := mayorGit.Add("AGENTS.md"); err != nil {
		t.Fatalf("git add: %v", err)
	}
	if err := mayorGit.Commit("Add AGENTS.md"); err != nil {
		t.Fatalf("git commit: %v", err)
	}

	// AddWithOptions needs origin/main to exist. Add self as origin and fetch.
	cmd = exec.Command("git", "remote", "add", "origin", mayorRig)
	cmd.Dir = mayorRig
	if out, err := cmd.CombinedOutput(); err != nil {
		t.Fatalf("git remote add: %v\n%s", err, out)
	}
	if err := mayorGit.Fetch("origin"); err != nil {
		t.Fatalf("git fetch: %v", err)
	}

	// Create rig pointing to root
	r := &rig.Rig{
		Name: "rig",
		Path: root,
	}
	m := NewManager(r, git.NewGit(root))

	// Create polecat via AddWithOptions
	polecat, err := m.AddWithOptions("TestAgent", AddOptions{})
	if err != nil {
		t.Fatalf("AddWithOptions: %v", err)
	}

	// Verify AGENTS.md exists in the worktree
	worktreeAgentsMD := filepath.Join(polecat.ClonePath, "AGENTS.md")
	if _, err := os.Stat(worktreeAgentsMD); os.IsNotExist(err) {
		t.Errorf("AGENTS.md does not exist in worktree at %s", worktreeAgentsMD)
	}

	// Verify content matches
	content, err := os.ReadFile(worktreeAgentsMD)
	if err != nil {
		t.Fatalf("read worktree AGENTS.md: %v", err)
	}
	if string(content) != string(agentsMDContent) {
		t.Errorf("AGENTS.md content = %q, want %q", string(content), string(agentsMDContent))
	}
}

func TestAddWithOptions_AgentsMDFallback(t *testing.T) {
	// This test verifies the fallback: if AGENTS.md is not in git,
	// it should be copied from mayor/rig.

	root := t.TempDir()

	// Create mayor/rig directory structure
	mayorRig := filepath.Join(root, "mayor", "rig")
	if err := os.MkdirAll(mayorRig, 0755); err != nil {
		t.Fatalf("mkdir mayor/rig: %v", err)
	}

	// Initialize git repo in mayor/rig WITHOUT AGENTS.md in git
	cmd := exec.Command("git", "init")
	cmd.Dir = mayorRig
	if out, err := cmd.CombinedOutput(); err != nil {
		t.Fatalf("git init: %v\n%s", err, out)
	}

	// Create a dummy file and commit (repo needs at least one commit)
	dummyPath := filepath.Join(mayorRig, "README.md")
	if err := os.WriteFile(dummyPath, []byte("# Test\n"), 0644); err != nil {
		t.Fatalf("write README.md: %v", err)
	}
	mayorGit := git.NewGit(mayorRig)
	if err := mayorGit.Add("README.md"); err != nil {
		t.Fatalf("git add: %v", err)
	}
	if err := mayorGit.Commit("Initial commit"); err != nil {
		t.Fatalf("git commit: %v", err)
	}

	// AddWithOptions needs origin/main to exist. Add self as origin and fetch.
	cmd = exec.Command("git", "remote", "add", "origin", mayorRig)
	cmd.Dir = mayorRig
	if out, err := cmd.CombinedOutput(); err != nil {
		t.Fatalf("git remote add: %v\n%s", err, out)
	}
	if err := mayorGit.Fetch("origin"); err != nil {
		t.Fatalf("git fetch: %v", err)
	}

	// Now create AGENTS.md in mayor/rig (but NOT committed to git)
	// This simulates the fallback scenario
	agentsMDContent := []byte("# AGENTS.md\n\nFallback content.\n")
	agentsMDPath := filepath.Join(mayorRig, "AGENTS.md")
	if err := os.WriteFile(agentsMDPath, agentsMDContent, 0644); err != nil {
		t.Fatalf("write AGENTS.md: %v", err)
	}

	// Create rig pointing to root
	r := &rig.Rig{
		Name: "rig",
		Path: root,
	}
	m := NewManager(r, git.NewGit(root))

	// Create polecat via AddWithOptions
	polecat, err := m.AddWithOptions("TestFallback", AddOptions{})
	if err != nil {
		t.Fatalf("AddWithOptions: %v", err)
	}

	// Verify AGENTS.md exists in the worktree (via fallback copy)
	worktreeAgentsMD := filepath.Join(polecat.ClonePath, "AGENTS.md")
	if _, err := os.Stat(worktreeAgentsMD); os.IsNotExist(err) {
		t.Errorf("AGENTS.md does not exist in worktree (fallback failed) at %s", worktreeAgentsMD)
	}

	// Verify content matches the fallback source
	content, err := os.ReadFile(worktreeAgentsMD)
	if err != nil {
		t.Fatalf("read worktree AGENTS.md: %v", err)
	}
	if string(content) != string(agentsMDContent) {
		t.Errorf("AGENTS.md content = %q, want %q", string(content), string(agentsMDContent))
	}
}