package evolution_test

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

	"github.com/sipeed/picoclaw/pkg/evolution"
)

func TestRecallSimilarSkills_ReturnsWorkspaceSkillFirst(t *testing.T) {
	workspace := t.TempDir()
	globalHome := t.TempDir()
	builtinRoot := t.TempDir()

	t.Setenv("HOME", globalHome)
	t.Setenv("PICOCLAW_BUILTIN_SKILLS", builtinRoot)

	mustWriteSkill := func(root, name, content string) {
		t.Helper()
		dir := filepath.Join(root, name)
		if err := os.MkdirAll(dir, 0o755); err != nil {
			t.Fatalf("MkdirAll(%s): %v", dir, err)
		}
		if err := os.WriteFile(filepath.Join(dir, "SKILL.md"), []byte(content), 0o644); err != nil {
			t.Fatalf("WriteFile(%s): %v", name, err)
		}
	}

	mustWriteSkill(
		filepath.Join(workspace, "skills"),
		"weather",
		"---\nname: weather\ndescription: weather lookup\n---\n# Weather\nUse weather queries.\n",
	)
	mustWriteSkill(
		filepath.Join(globalHome, ".picoclaw", "skills"),
		"release",
		"---\nname: release\ndescription: release flow\n---\n# Release\nRelease build.\n",
	)
	mustWriteSkill(
		builtinRoot,
		"weather-fallback",
		"---\nname: weather-fallback\ndescription: weather backup\n---\n# Weather Fallback\nBackup weather path.\n",
	)

	recaller := evolution.NewSkillsRecaller(workspace)
	matches, err := recaller.RecallSimilarSkills(evolution.LearningRecord{
		Kind:       evolution.RecordKindRule,
		Summary:    "weather native-name path",
		EventCount: 4,
	})
	if err != nil {
		t.Fatalf("RecallSimilarSkills: %v", err)
	}
	if len(matches) == 0 {
		t.Fatal("expected at least one match")
	}
	if matches[0].Name != "weather" {
		t.Fatalf("first match = %q, want weather", matches[0].Name)
	}
}

func TestRecallSimilarSkills_UsesExplicitWinningPathOnly(t *testing.T) {
	workspace := t.TempDir()
	globalHome := t.TempDir()
	builtinRoot := t.TempDir()

	t.Setenv("HOME", globalHome)
	t.Setenv("PICOCLAW_BUILTIN_SKILLS", builtinRoot)

	mustWriteSkill := func(root, name, description string) {
		t.Helper()
		dir := filepath.Join(root, name)
		if err := os.MkdirAll(dir, 0o755); err != nil {
			t.Fatalf("MkdirAll(%s): %v", dir, err)
		}
		content := "---\nname: " + name + "\ndescription: " + description + "\n---\n# " + name + "\nUse this skill.\n"
		if err := os.WriteFile(filepath.Join(dir, "SKILL.md"), []byte(content), 0o644); err != nil {
			t.Fatalf("WriteFile(%s): %v", name, err)
		}
	}

	workspaceSkills := filepath.Join(workspace, "skills")
	mustWriteSkill(workspaceSkills, "three-one-theorem", "Add 31 and continue theorem calculation.")
	mustWriteSkill(workspaceSkills, "four-two-theorem", "Add 42 and continue theorem calculation.")
	mustWriteSkill(workspaceSkills, "five-three-theorem", "Subtract 53 and finish theorem calculation.")
	mustWriteSkill(workspaceSkills, "github", "Interact with GitHub using the gh CLI.")
	mustWriteSkill(workspaceSkills, "tmux", "Remote-control tmux sessions by sending keystrokes.")

	recaller := evolution.NewSkillsRecaller(workspace)
	matches, err := recaller.RecallSimilarSkills(evolution.LearningRecord{
		Kind:    evolution.RecordKindPattern,
		Summary: "Calculate a value by applying the Three-One Theorem rules",
		WinningPath: []string{
			"three-one-theorem",
			"four-two-theorem",
			"five-three-theorem",
		},
		MatchedSkillNames: []string{
			"three-one-theorem",
			"four-two-theorem",
			"five-three-theorem",
		},
	})
	if err != nil {
		t.Fatalf("RecallSimilarSkills: %v", err)
	}

	got := make([]string, 0, len(matches))
	for _, match := range matches {
		got = append(got, match.Name)
	}
	want := []string{"three-one-theorem", "four-two-theorem", "five-three-theorem"}
	if strings.Join(got, ",") != strings.Join(want, ",") {
		t.Fatalf("matches = %v, want %v", got, want)
	}
}