import { describe, test, expect } from 'bun:test';
import { COMMAND_DESCRIPTIONS } from '../browse/src/commands';
import { SNAPSHOT_FLAGS } from '../browse/src/snapshot';
import * as fs from 'fs';
import * as path from 'path';

const ROOT = path.resolve(import.meta.dir, '..');

describe('gen-skill-docs', () => {
  test('generated SKILL.md contains all command categories', () => {
    const content = fs.readFileSync(path.join(ROOT, 'SKILL.md'), 'utf-8');
    const categories = new Set(Object.values(COMMAND_DESCRIPTIONS).map(d => d.category));
    for (const cat of categories) {
      expect(content).toContain(`### ${cat}`);
    }
  });

  test('generated SKILL.md contains all commands', () => {
    const content = fs.readFileSync(path.join(ROOT, 'SKILL.md'), 'utf-8');
    for (const [cmd, meta] of Object.entries(COMMAND_DESCRIPTIONS)) {
      const display = meta.usage || cmd;
      expect(content).toContain(display);
    }
  });

  test('command table is sorted alphabetically within categories', () => {
    const content = fs.readFileSync(path.join(ROOT, 'SKILL.md'), 'utf-8');
    // Extract command names from the Navigation section as a test
    const navSection = content.match(/### Navigation\n\|.*\n\|.*\n([\s\S]*?)(?=\n###|\n## )/);
    expect(navSection).not.toBeNull();
    const rows = navSection![1].trim().split('\n');
    const commands = rows.map(r => {
      const match = r.match(/\| `(\w+)/);
      return match ? match[1] : '';
    }).filter(Boolean);
    const sorted = [...commands].sort();
    expect(commands).toEqual(sorted);
  });

  test('generated header is present in SKILL.md', () => {
    const content = fs.readFileSync(path.join(ROOT, 'SKILL.md'), 'utf-8');
    expect(content).toContain('AUTO-GENERATED from SKILL.md.tmpl');
    expect(content).toContain('Regenerate: bun run gen:skill-docs');
  });

  test('generated header is present in browse/SKILL.md', () => {
    const content = fs.readFileSync(path.join(ROOT, 'browse', 'SKILL.md'), 'utf-8');
    expect(content).toContain('AUTO-GENERATED from SKILL.md.tmpl');
  });

  test('snapshot flags section contains all flags', () => {
    const content = fs.readFileSync(path.join(ROOT, 'SKILL.md'), 'utf-8');
    for (const flag of SNAPSHOT_FLAGS) {
      expect(content).toContain(flag.short);
      expect(content).toContain(flag.description);
    }
  });

  test('template files exist for generated SKILL.md files', () => {
    expect(fs.existsSync(path.join(ROOT, 'SKILL.md.tmpl'))).toBe(true);
    expect(fs.existsSync(path.join(ROOT, 'browse', 'SKILL.md.tmpl'))).toBe(true);
  });

  test('templates contain placeholders', () => {
    const rootTmpl = fs.readFileSync(path.join(ROOT, 'SKILL.md.tmpl'), 'utf-8');
    expect(rootTmpl).toContain('{{COMMAND_REFERENCE}}');
    expect(rootTmpl).toContain('{{SNAPSHOT_FLAGS}}');

    const browseTmpl = fs.readFileSync(path.join(ROOT, 'browse', 'SKILL.md.tmpl'), 'utf-8');
    expect(browseTmpl).toContain('{{COMMAND_REFERENCE}}');
    expect(browseTmpl).toContain('{{SNAPSHOT_FLAGS}}');
  });
});

/**
 * Quality evals — catch description regressions.
 *
 * These test that generated output is *useful for an AI agent*,
 * not just structurally valid. Each test targets a specific
 * regression we actually shipped and caught in review.
 */
describe('description quality evals', () => {
  // Regression: snapshot flags lost value hints (-d <N>, -s <sel>, -o <path>)
  test('snapshot flags with values include value hints in output', () => {
    const content = fs.readFileSync(path.join(ROOT, 'SKILL.md'), 'utf-8');
    for (const flag of SNAPSHOT_FLAGS) {
      if (flag.takesValue) {
        expect(flag.valueHint).toBeDefined();
        expect(content).toContain(`${flag.short} ${flag.valueHint}`);
      }
    }
  });

  // Regression: "is" lost the valid states enum
  test('is command lists valid state values', () => {
    const desc = COMMAND_DESCRIPTIONS['is'].description;
    for (const state of ['visible', 'hidden', 'enabled', 'disabled', 'checked', 'editable', 'focused']) {
      expect(desc).toContain(state);
    }
  });

  // Regression: "press" lost common key examples
  test('press command lists example keys', () => {
    const desc = COMMAND_DESCRIPTIONS['press'].description;
    expect(desc).toContain('Enter');
    expect(desc).toContain('Tab');
    expect(desc).toContain('Escape');
  });

  // Regression: "console" lost --errors filter note
  test('console command describes --errors behavior', () => {
    const desc = COMMAND_DESCRIPTIONS['console'].description;
    expect(desc).toContain('--errors');
  });

  // Regression: snapshot -i lost "@e refs" context
  test('snapshot -i mentions @e refs', () => {
    const flag = SNAPSHOT_FLAGS.find(f => f.short === '-i')!;
    expect(flag.description).toContain('@e');
  });

  // Regression: snapshot -C lost "@c refs" context
  test('snapshot -C mentions @c refs', () => {
    const flag = SNAPSHOT_FLAGS.find(f => f.short === '-C')!;
    expect(flag.description).toContain('@c');
  });

  // Guard: every description must be at least 8 chars (catches empty or stub descriptions)
  test('all command descriptions have meaningful length', () => {
    for (const [cmd, meta] of Object.entries(COMMAND_DESCRIPTIONS)) {
      expect(meta.description.length).toBeGreaterThanOrEqual(8);
    }
  });

  // Guard: snapshot flag descriptions must be at least 10 chars
  test('all snapshot flag descriptions have meaningful length', () => {
    for (const flag of SNAPSHOT_FLAGS) {
      expect(flag.description.length).toBeGreaterThanOrEqual(10);
    }
  });

  // Guard: generated output uses → not ->
  test('generated SKILL.md uses unicode arrows', () => {
    const content = fs.readFileSync(path.join(ROOT, 'SKILL.md'), 'utf-8');
    // Check the Tips section specifically (where we regressed -> from →)
    const tipsSection = content.slice(content.indexOf('## Tips'));
    expect(tipsSection).toContain('→');
    expect(tipsSection).not.toContain('->');
  });
});