package skills

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

func TestLoader(t *testing.T) {
	// Create temporary skills directory structure
	tmpDir := t.TempDir()

	// Create a test skill
	skillDir := filepath.Join(tmpDir, "devops", "test-skill")
	if err := os.MkdirAll(skillDir, 0755); err != nil {
		t.Fatal(err)
	}

	// Write SKILL.md
	skillMD := `---
name: test-skill
description: A test skill for unit testing
---

# Test Skill

This is the instructions body.
It has multiple lines.
`
	skillMDPath := filepath.Join(skillDir, "SKILL.md")
	if err := os.WriteFile(skillMDPath, []byte(skillMD), 0644); err != nil {
		t.Fatal(err)
	}

	// Create scripts/ directory with a test script
	scriptsDir := filepath.Join(skillDir, "scripts")
	if err := os.MkdirAll(scriptsDir, 0755); err != nil {
		t.Fatal(err)
	}
	scriptPath := filepath.Join(scriptsDir, "test.sh")
	if err := os.WriteFile(scriptPath, []byte("#!/bin/bash\necho test"), 0755); err != nil {
		t.Fatal(err)
	}

	// Create references/ directory with a test reference
	refsDir := filepath.Join(skillDir, "references")
	if err := os.MkdirAll(refsDir, 0755); err != nil {
		t.Fatal(err)
	}
	refPath := filepath.Join(refsDir, "api.md")
	if err := os.WriteFile(refPath, []byte("# API Reference"), 0644); err != nil {
		t.Fatal(err)
	}

	loader := NewLoader(tmpDir)

	// Test LoadMeta
	t.Run("LoadMeta", func(t *testing.T) {
		metas, err := loader.LoadMeta()
		if err != nil {
			t.Fatalf("LoadMeta failed: %v", err)
		}

		if len(metas) != 1 {
			t.Fatalf("expected 1 skill, got %d", len(metas))
		}

		meta := metas[0]
		if meta.Name != "test-skill" {
			t.Errorf("expected name 'test-skill', got %q", meta.Name)
		}
		if meta.Category != "devops" {
			t.Errorf("expected category 'devops', got %q", meta.Category)
		}
		if meta.Description != "A test skill for unit testing" {
			t.Errorf("expected description 'A test skill for unit testing', got %q", meta.Description)
		}
	})

	// Test LoadSkill
	t.Run("LoadSkill", func(t *testing.T) {
		skill, err := loader.LoadSkill("test-skill")
		if err != nil {
			t.Fatalf("LoadSkill failed: %v", err)
		}

		if skill.Meta.Name != "test-skill" {
			t.Errorf("expected name 'test-skill', got %q", skill.Meta.Name)
		}

		if skill.Instructions == "" {
			t.Error("instructions should not be empty")
		}

		if len(skill.Scripts) != 1 || skill.Scripts[0] != "test.sh" {
			t.Errorf("expected Scripts=['test.sh'], got %v", skill.Scripts)
		}

		if len(skill.References) != 1 || skill.References[0] != "api.md" {
			t.Errorf("expected References=['api.md'], got %v", skill.References)
		}
	})

	// Test LoadSkill nonexistent
	t.Run("LoadSkill_nonexistent", func(t *testing.T) {
		_, err := loader.LoadSkill("nonexistent")
		if err == nil {
			t.Error("expected error for nonexistent skill")
		}
	})

	// Test ReadResource
	t.Run("ReadResource", func(t *testing.T) {
		content, err := loader.ReadResource("test-skill", "scripts/test.sh")
		if err != nil {
			t.Fatalf("ReadResource failed: %v", err)
		}

		if content != "#!/bin/bash\necho test" {
			t.Errorf("unexpected content: %q", content)
		}
	})

	// Test ReadResource path traversal protection
	t.Run("ReadResource_path_traversal", func(t *testing.T) {
		_, err := loader.ReadResource("test-skill", "../../../etc/passwd")
		if err == nil {
			t.Error("expected error for path traversal attempt")
		}
	})
}