/**
 * Tests for the bundled skill-creator scripts
 */

import { afterEach, beforeEach, describe, expect, test } from "bun:test";
import { existsSync, mkdirSync, rmSync, writeFileSync } from "node:fs";
import { join } from "node:path";
import {
  initSkill,
  titleCaseSkillName,
} from "../../skills/builtin/creating-skills/scripts/init-skill";
import { packageSkill } from "../../skills/builtin/creating-skills/scripts/package-skill";
import { validateSkill } from "../../skills/builtin/creating-skills/scripts/validate-skill";

const TEST_DIR = join(import.meta.dir, ".test-skill-creator");

describe("validate-skill", () => {
  beforeEach(() => {
    if (existsSync(TEST_DIR)) {
      rmSync(TEST_DIR, { recursive: true });
    }
    mkdirSync(TEST_DIR, { recursive: true });
  });

  afterEach(() => {
    if (existsSync(TEST_DIR)) {
      rmSync(TEST_DIR, { recursive: true });
    }
  });

  test("validates a valid skill", () => {
    const skillDir = join(TEST_DIR, "valid-skill");
    mkdirSync(skillDir);
    writeFileSync(
      join(skillDir, "SKILL.md"),
      `---
name: valid-skill
description: A valid test skill
---

# Valid Skill

This is a valid skill.
`,
    );

    const result = validateSkill(skillDir);
    expect(result.valid).toBe(true);
    expect(result.message).toBe("Skill is valid!");
  });

  test("fails when SKILL.md is missing", () => {
    const skillDir = join(TEST_DIR, "missing-skill");
    mkdirSync(skillDir);

    const result = validateSkill(skillDir);
    expect(result.valid).toBe(false);
    expect(result.message).toBe("SKILL.md not found");
  });

  test("fails when frontmatter is missing", () => {
    const skillDir = join(TEST_DIR, "no-frontmatter");
    mkdirSync(skillDir);
    writeFileSync(
      join(skillDir, "SKILL.md"),
      `# No Frontmatter

This skill has no frontmatter.
`,
    );

    const result = validateSkill(skillDir);
    expect(result.valid).toBe(false);
    expect(result.message).toBe("No YAML frontmatter found");
  });

  test("fails when name is missing", () => {
    const skillDir = join(TEST_DIR, "no-name");
    mkdirSync(skillDir);
    writeFileSync(
      join(skillDir, "SKILL.md"),
      `---
description: A skill without a name
---

# No Name
`,
    );

    const result = validateSkill(skillDir);
    expect(result.valid).toBe(false);
    expect(result.message).toBe("Missing 'name' in frontmatter");
  });

  test("fails when description is missing", () => {
    const skillDir = join(TEST_DIR, "no-description");
    mkdirSync(skillDir);
    writeFileSync(
      join(skillDir, "SKILL.md"),
      `---
name: no-description
---

# No Description
`,
    );

    const result = validateSkill(skillDir);
    expect(result.valid).toBe(false);
    expect(result.message).toBe("Missing 'description' in frontmatter");
  });

  test("fails when name has invalid characters", () => {
    const skillDir = join(TEST_DIR, "invalid-name");
    mkdirSync(skillDir);
    writeFileSync(
      join(skillDir, "SKILL.md"),
      `---
name: Invalid_Name
description: A skill with invalid name
---

# Invalid Name
`,
    );

    const result = validateSkill(skillDir);
    expect(result.valid).toBe(false);
    expect(result.message).toContain("should be hyphen-case");
  });

  test("fails when name starts with hyphen", () => {
    const skillDir = join(TEST_DIR, "hyphen-start");
    mkdirSync(skillDir);
    writeFileSync(
      join(skillDir, "SKILL.md"),
      `---
name: -invalid-start
description: A skill with invalid name
---

# Invalid Start
`,
    );

    const result = validateSkill(skillDir);
    expect(result.valid).toBe(false);
    expect(result.message).toContain("cannot start/end with hyphen");
  });

  test("fails when description contains angle brackets", () => {
    const skillDir = join(TEST_DIR, "angle-brackets");
    mkdirSync(skillDir);
    writeFileSync(
      join(skillDir, "SKILL.md"),
      `---
name: angle-brackets
description: A skill with <invalid> description
---

# Angle Brackets
`,
    );

    const result = validateSkill(skillDir);
    expect(result.valid).toBe(false);
    expect(result.message).toContain("cannot contain angle brackets");
  });

  test("warns but passes when unknown frontmatter keys are present", () => {
    const skillDir = join(TEST_DIR, "unknown-keys");
    mkdirSync(skillDir);
    writeFileSync(
      join(skillDir, "SKILL.md"),
      `---
name: unknown-keys
description: A skill with unknown keys
author: Someone
version: 1.0.0
---

# Unknown Keys
`,
    );

    const result = validateSkill(skillDir);
    expect(result.valid).toBe(true);
    expect(result.warnings).toBeDefined();
    expect(result.warnings?.length).toBeGreaterThan(0);
    expect(result.warnings?.[0]).toContain("Unknown frontmatter key(s)");
  });

  test("accepts all official spec frontmatter fields without warnings", () => {
    const skillDir = join(TEST_DIR, "full-spec");
    mkdirSync(skillDir);
    writeFileSync(
      join(skillDir, "SKILL.md"),
      `---
name: full-spec
description: A skill with all official spec fields
license: MIT
compatibility: Requires Node.js 18+
metadata:
  author: test
  version: "1.0"
allowed-tools: Bash Read Write
---

# Full Spec Skill
`,
    );

    const result = validateSkill(skillDir);
    expect(result.valid).toBe(true);
    expect(result.warnings).toBeUndefined();
  });

  test("warns when name doesn't match directory name", () => {
    const skillDir = join(TEST_DIR, "my-directory");
    mkdirSync(skillDir);
    writeFileSync(
      join(skillDir, "SKILL.md"),
      `---
name: different-name
description: Name doesn't match directory
---

# Mismatched Name
`,
    );

    const result = validateSkill(skillDir);
    expect(result.valid).toBe(true);
    expect(result.warnings).toBeDefined();
    expect(result.warnings?.[0]).toContain("doesn't match directory name");
  });
});

describe("init-skill", () => {
  beforeEach(() => {
    if (existsSync(TEST_DIR)) {
      rmSync(TEST_DIR, { recursive: true });
    }
    mkdirSync(TEST_DIR, { recursive: true });
  });

  afterEach(() => {
    if (existsSync(TEST_DIR)) {
      rmSync(TEST_DIR, { recursive: true });
    }
  });

  test("titleCaseSkillName converts hyphenated names", () => {
    expect(titleCaseSkillName("my-skill")).toBe("My Skill");
    expect(titleCaseSkillName("pdf-editor")).toBe("Pdf Editor");
    expect(titleCaseSkillName("big-query-helper")).toBe("Big Query Helper");
  });

  test("creates a new skill directory with all files", () => {
    const result = initSkill("test-skill", TEST_DIR);

    expect(result).not.toBeNull();
    expect(existsSync(join(TEST_DIR, "test-skill"))).toBe(true);
    expect(existsSync(join(TEST_DIR, "test-skill", "SKILL.md"))).toBe(true);
    expect(existsSync(join(TEST_DIR, "test-skill", "scripts"))).toBe(true);
    expect(existsSync(join(TEST_DIR, "test-skill", "references"))).toBe(true);
    expect(existsSync(join(TEST_DIR, "test-skill", "assets"))).toBe(true);
  });

  test("created skill passes validation", () => {
    initSkill("valid-init", TEST_DIR);

    // The initialized skill should pass validation (except for TODO in description)
    const skillDir = join(TEST_DIR, "valid-init");
    expect(existsSync(join(skillDir, "SKILL.md"))).toBe(true);
  });

  test("fails when directory already exists", () => {
    const skillDir = join(TEST_DIR, "existing-skill");
    mkdirSync(skillDir, { recursive: true });

    const result = initSkill("existing-skill", TEST_DIR);
    expect(result).toBeNull();
  });
});

describe("package-skill", () => {
  beforeEach(() => {
    if (existsSync(TEST_DIR)) {
      rmSync(TEST_DIR, { recursive: true });
    }
    mkdirSync(TEST_DIR, { recursive: true });
  });

  afterEach(() => {
    if (existsSync(TEST_DIR)) {
      rmSync(TEST_DIR, { recursive: true });
    }
  });

  test("packages a valid skill into a .skill file", () => {
    // Create a valid skill
    const skillDir = join(TEST_DIR, "packagable-skill");
    mkdirSync(skillDir);
    writeFileSync(
      join(skillDir, "SKILL.md"),
      `---
name: packagable-skill
description: A skill that can be packaged
---

# Packagable Skill

This skill can be packaged.
`,
    );

    const result = packageSkill(skillDir, TEST_DIR);
    expect(result).not.toBeNull();
    expect(existsSync(join(TEST_DIR, "packagable-skill.skill"))).toBe(true);
  });

  test("fails when skill directory does not exist", () => {
    const result = packageSkill(join(TEST_DIR, "nonexistent"), TEST_DIR);
    expect(result).toBeNull();
  });

  test("fails when SKILL.md is missing", () => {
    const skillDir = join(TEST_DIR, "no-skill-md");
    mkdirSync(skillDir);

    const result = packageSkill(skillDir, TEST_DIR);
    expect(result).toBeNull();
  });

  test("fails when skill validation fails", () => {
    const skillDir = join(TEST_DIR, "invalid-skill");
    mkdirSync(skillDir);
    writeFileSync(
      join(skillDir, "SKILL.md"),
      `---
name: Invalid_Name
description: Invalid skill
---

# Invalid
`,
    );

    const result = packageSkill(skillDir, TEST_DIR);
    expect(result).toBeNull();
  });
});