import { describe, test, expect } from 'bun:test';
import { validateSkill, extractRemoteSlugPatterns, extractWeightsFromTable } from './helpers/skill-parser';
import { ALL_COMMANDS, COMMAND_DESCRIPTIONS, READ_COMMANDS, WRITE_COMMANDS, META_COMMANDS } 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('SKILL.md command validation', () => {
  test('all $B commands in SKILL.md are valid browse commands', () => {
    const result = validateSkill(path.join(ROOT, 'SKILL.md'));
    expect(result.invalid).toHaveLength(0);
    expect(result.valid.length).toBeGreaterThan(0);
  });

  test('all snapshot flags in SKILL.md are valid', () => {
    const result = validateSkill(path.join(ROOT, 'SKILL.md'));
    expect(result.snapshotFlagErrors).toHaveLength(0);
  });

  test('all $B commands in browse/SKILL.md are valid browse commands', () => {
    const result = validateSkill(path.join(ROOT, 'browse', 'SKILL.md'));
    expect(result.invalid).toHaveLength(0);
    expect(result.valid.length).toBeGreaterThan(0);
  });

  test('all snapshot flags in browse/SKILL.md are valid', () => {
    const result = validateSkill(path.join(ROOT, 'browse', 'SKILL.md'));
    expect(result.snapshotFlagErrors).toHaveLength(0);
  });

  test('all $B commands in qa/SKILL.md are valid browse commands', () => {
    const qaSkill = path.join(ROOT, 'qa', 'SKILL.md');
    if (!fs.existsSync(qaSkill)) return; // skip if missing
    const result = validateSkill(qaSkill);
    expect(result.invalid).toHaveLength(0);
  });

  test('all snapshot flags in qa/SKILL.md are valid', () => {
    const qaSkill = path.join(ROOT, 'qa', 'SKILL.md');
    if (!fs.existsSync(qaSkill)) return;
    const result = validateSkill(qaSkill);
    expect(result.snapshotFlagErrors).toHaveLength(0);
  });

  test('all $B commands in qa-only/SKILL.md are valid browse commands', () => {
    const qaOnlySkill = path.join(ROOT, 'qa-only', 'SKILL.md');
    if (!fs.existsSync(qaOnlySkill)) return;
    const result = validateSkill(qaOnlySkill);
    expect(result.invalid).toHaveLength(0);
  });

  test('all snapshot flags in qa-only/SKILL.md are valid', () => {
    const qaOnlySkill = path.join(ROOT, 'qa-only', 'SKILL.md');
    if (!fs.existsSync(qaOnlySkill)) return;
    const result = validateSkill(qaOnlySkill);
    expect(result.snapshotFlagErrors).toHaveLength(0);
  });
});

describe('Command registry consistency', () => {
  test('COMMAND_DESCRIPTIONS covers all commands in sets', () => {
    const allCmds = new Set([...READ_COMMANDS, ...WRITE_COMMANDS, ...META_COMMANDS]);
    const descKeys = new Set(Object.keys(COMMAND_DESCRIPTIONS));
    for (const cmd of allCmds) {
      expect(descKeys.has(cmd)).toBe(true);
    }
  });

  test('COMMAND_DESCRIPTIONS has no extra commands not in sets', () => {
    const allCmds = new Set([...READ_COMMANDS, ...WRITE_COMMANDS, ...META_COMMANDS]);
    for (const key of Object.keys(COMMAND_DESCRIPTIONS)) {
      expect(allCmds.has(key)).toBe(true);
    }
  });

  test('ALL_COMMANDS matches union of all sets', () => {
    const union = new Set([...READ_COMMANDS, ...WRITE_COMMANDS, ...META_COMMANDS]);
    expect(ALL_COMMANDS.size).toBe(union.size);
    for (const cmd of union) {
      expect(ALL_COMMANDS.has(cmd)).toBe(true);
    }
  });

  test('SNAPSHOT_FLAGS option keys are valid SnapshotOptions fields', () => {
    const validKeys = new Set([
      'interactive', 'compact', 'depth', 'selector',
      'diff', 'annotate', 'outputPath', 'cursorInteractive',
    ]);
    for (const flag of SNAPSHOT_FLAGS) {
      expect(validKeys.has(flag.optionKey)).toBe(true);
    }
  });
});

describe('Usage string consistency', () => {
  // Normalize a usage string to its structural skeleton for comparison.
  // Replaces <param-names> with <>, [optional] with [], strips parenthetical hints.
  // This catches format mismatches (e.g., <name>:<value> vs <name> <value>)
  // without tripping on abbreviation differences (e.g., <sel> vs <selector>).
  function skeleton(usage: string): string {
    return usage
      .replace(/\(.*?\)/g, '')        // strip parenthetical hints like (e.g., Enter, Tab)
      .replace(/<[^>]*>/g, '<>')      // normalize <param-name> → <>
      .replace(/\[[^\]]*\]/g, '[]')   // normalize [optional] → []
      .replace(/\s+/g, ' ')           // collapse whitespace
      .trim();
  }

  // Cross-check Usage: patterns in implementation against COMMAND_DESCRIPTIONS
  test('implementation Usage: structural format matches COMMAND_DESCRIPTIONS', () => {
    const implFiles = [
      path.join(ROOT, 'browse', 'src', 'write-commands.ts'),
      path.join(ROOT, 'browse', 'src', 'read-commands.ts'),
      path.join(ROOT, 'browse', 'src', 'meta-commands.ts'),
    ];

    // Extract "Usage: browse <pattern>" from throw new Error(...) calls
    const usagePattern = /throw new Error\(['"`]Usage:\s*browse\s+(.+?)['"`]\)/g;
    const implUsages = new Map<string, string>();

    for (const file of implFiles) {
      const content = fs.readFileSync(file, 'utf-8');
      let match;
      while ((match = usagePattern.exec(content)) !== null) {
        const usage = match[1].split('\\n')[0].trim();
        const cmd = usage.split(/\s/)[0];
        implUsages.set(cmd, usage);
      }
    }

    // Compare structural skeletons
    const mismatches: string[] = [];
    for (const [cmd, implUsage] of implUsages) {
      const desc = COMMAND_DESCRIPTIONS[cmd];
      if (!desc) continue;
      if (!desc.usage) continue;
      const descSkel = skeleton(desc.usage);
      const implSkel = skeleton(implUsage);
      if (descSkel !== implSkel) {
        mismatches.push(`${cmd}: docs "${desc.usage}" (${descSkel}) vs impl "${implUsage}" (${implSkel})`);
      }
    }

    expect(mismatches).toEqual([]);
  });
});

describe('Generated SKILL.md freshness', () => {
  test('no unresolved {{placeholders}} in generated SKILL.md', () => {
    const content = fs.readFileSync(path.join(ROOT, 'SKILL.md'), 'utf-8');
    const unresolved = content.match(/\{\{\w+\}\}/g);
    expect(unresolved).toBeNull();
  });

  test('no unresolved {{placeholders}} in generated browse/SKILL.md', () => {
    const content = fs.readFileSync(path.join(ROOT, 'browse', 'SKILL.md'), 'utf-8');
    const unresolved = content.match(/\{\{\w+\}\}/g);
    expect(unresolved).toBeNull();
  });

  test('generated SKILL.md has AUTO-GENERATED header', () => {
    const content = fs.readFileSync(path.join(ROOT, 'SKILL.md'), 'utf-8');
    expect(content).toContain('AUTO-GENERATED');
  });
});

// --- Update check preamble validation ---

describe('Update check preamble', () => {
  const skillsWithUpdateCheck = [
    'SKILL.md', 'browse/SKILL.md', 'qa/SKILL.md',
    'qa-only/SKILL.md',
    'setup-browser-cookies/SKILL.md',
    'ship/SKILL.md', 'review/SKILL.md',
    'plan-ceo-review/SKILL.md', 'plan-eng-review/SKILL.md',
    'retro/SKILL.md',
  ];

  for (const skill of skillsWithUpdateCheck) {
    test(`${skill} update check line ends with || true`, () => {
      const content = fs.readFileSync(path.join(ROOT, skill), 'utf-8');
      // The second line of the bash block must end with || true
      // to avoid exit code 1 when _UPD is empty (up to date)
      const match = content.match(/\[ -n "\$_UPD" \].*$/m);
      expect(match).not.toBeNull();
      expect(match![0]).toContain('|| true');
    });
  }

  test('all skills with update check are generated from .tmpl', () => {
    for (const skill of skillsWithUpdateCheck) {
      const tmplPath = path.join(ROOT, skill + '.tmpl');
      expect(fs.existsSync(tmplPath)).toBe(true);
    }
  });

  test('update check bash block exits 0 when up to date', () => {
    // Simulate the exact preamble command from SKILL.md
    const result = Bun.spawnSync(['bash', '-c',
      '_UPD=$(echo "" || true); [ -n "$_UPD" ] && echo "$_UPD" || true'
    ], { stdout: 'pipe', stderr: 'pipe' });
    expect(result.exitCode).toBe(0);
  });

  test('update check bash block exits 0 when upgrade available', () => {
    const result = Bun.spawnSync(['bash', '-c',
      '_UPD=$(echo "UPGRADE_AVAILABLE 0.3.3 0.4.0" || true); [ -n "$_UPD" ] && echo "$_UPD" || true'
    ], { stdout: 'pipe', stderr: 'pipe' });
    expect(result.exitCode).toBe(0);
    expect(result.stdout.toString().trim()).toBe('UPGRADE_AVAILABLE 0.3.3 0.4.0');
  });
});

// --- Part 7: Cross-skill path consistency (A1) ---

describe('Cross-skill path consistency', () => {
  test('REMOTE_SLUG derivation pattern is identical across files that use it', () => {
    const patterns = extractRemoteSlugPatterns(ROOT, ['qa', 'review']);
    const allPatterns: string[] = [];

    for (const [, filePatterns] of patterns) {
      allPatterns.push(...filePatterns);
    }

    // Should find at least 2 occurrences (qa/SKILL.md + review/greptile-triage.md)
    expect(allPatterns.length).toBeGreaterThanOrEqual(2);

    // All occurrences must be character-for-character identical
    const unique = new Set(allPatterns);
    if (unique.size > 1) {
      const variants = Array.from(unique);
      throw new Error(
        `REMOTE_SLUG pattern differs across files:\n` +
        variants.map((v, i) => `  ${i + 1}: ${v}`).join('\n')
      );
    }
  });

  test('all greptile-history write references specify both per-project and global paths', () => {
    const filesToCheck = [
      'review/SKILL.md',
      'ship/SKILL.md',
      'review/greptile-triage.md',
    ];

    for (const file of filesToCheck) {
      const filePath = path.join(ROOT, file);
      if (!fs.existsSync(filePath)) continue;
      const content = fs.readFileSync(filePath, 'utf-8');

      const hasBoth = (content.includes('per-project') && content.includes('global')) ||
        (content.includes('$REMOTE_SLUG/greptile-history') && content.includes('~/.gstack/greptile-history'));

      expect(hasBoth).toBe(true);
    }
  });

  test('greptile-triage.md contains both project and global history paths', () => {
    const content = fs.readFileSync(path.join(ROOT, 'review', 'greptile-triage.md'), 'utf-8');
    expect(content).toContain('$REMOTE_SLUG/greptile-history.md');
    expect(content).toContain('~/.gstack/greptile-history.md');
  });

  test('retro/SKILL.md reads global greptile-history (not per-project)', () => {
    const content = fs.readFileSync(path.join(ROOT, 'retro', 'SKILL.md'), 'utf-8');
    expect(content).toContain('~/.gstack/greptile-history.md');
    // Should NOT reference per-project path for reads
    expect(content).not.toContain('$REMOTE_SLUG/greptile-history.md');
  });
});

// --- Part 7: QA skill structure validation (A2) ---

describe('QA skill structure validation', () => {
  const qaContent = fs.readFileSync(path.join(ROOT, 'qa', 'SKILL.md'), 'utf-8');

  test('qa/SKILL.md has all 11 phases', () => {
    const phases = [
      'Phase 1', 'Initialize',
      'Phase 2', 'Authenticate',
      'Phase 3', 'Orient',
      'Phase 4', 'Explore',
      'Phase 5', 'Document',
      'Phase 6', 'Wrap Up',
      'Phase 7', 'Triage',
      'Phase 8', 'Fix Loop',
      'Phase 9', 'Final QA',
      'Phase 10', 'Report',
      'Phase 11', 'TODOS',
    ];
    for (const phase of phases) {
      expect(qaContent).toContain(phase);
    }
  });

  test('has all four QA modes defined', () => {
    const modes = [
      'Diff-aware',
      'Full',
      'Quick',
      'Regression',
    ];
    for (const mode of modes) {
      expect(qaContent).toContain(mode);
    }

    // Mode triggers/flags
    expect(qaContent).toContain('--quick');
    expect(qaContent).toContain('--regression');
  });

  test('has all three tiers defined', () => {
    const tiers = ['Quick', 'Standard', 'Exhaustive'];
    for (const tier of tiers) {
      expect(qaContent).toContain(tier);
    }
  });

  test('health score weights sum to 100%', () => {
    const weights = extractWeightsFromTable(qaContent);
    expect(weights.size).toBeGreaterThan(0);

    let sum = 0;
    for (const pct of weights.values()) {
      sum += pct;
    }
    expect(sum).toBe(100);
  });

  test('health score has all 8 categories', () => {
    const weights = extractWeightsFromTable(qaContent);
    const expectedCategories = [
      'Console', 'Links', 'Visual', 'Functional',
      'UX', 'Performance', 'Content', 'Accessibility',
    ];
    for (const cat of expectedCategories) {
      expect(weights.has(cat)).toBe(true);
    }
    expect(weights.size).toBe(8);
  });

  test('has four mode definitions (Diff-aware/Full/Quick/Regression)', () => {
    expect(qaContent).toContain('### Diff-aware');
    expect(qaContent).toContain('### Full');
    expect(qaContent).toContain('### Quick');
    expect(qaContent).toContain('### Regression');
  });

  test('output structure references report directory layout', () => {
    expect(qaContent).toContain('qa-report-');
    expect(qaContent).toContain('baseline.json');
    expect(qaContent).toContain('screenshots/');
    expect(qaContent).toContain('.gstack/qa-reports/');
  });
});

// --- Part 7: Greptile history format consistency (A3) ---

describe('Greptile history format consistency', () => {
  test('greptile-triage.md defines the canonical history format', () => {
    const content = fs.readFileSync(path.join(ROOT, 'review', 'greptile-triage.md'), 'utf-8');
    expect(content).toContain('<YYYY-MM-DD>');
    expect(content).toContain('<owner/repo>');
    expect(content).toContain('<type');
    expect(content).toContain('<file-pattern>');
    expect(content).toContain('<category>');
  });

  test('review/SKILL.md and ship/SKILL.md both reference greptile-triage.md for write details', () => {
    const reviewContent = fs.readFileSync(path.join(ROOT, 'review', 'SKILL.md'), 'utf-8');
    const shipContent = fs.readFileSync(path.join(ROOT, 'ship', 'SKILL.md'), 'utf-8');

    expect(reviewContent.toLowerCase()).toContain('greptile-triage.md');
    expect(shipContent.toLowerCase()).toContain('greptile-triage.md');
  });

  test('greptile-triage.md defines all 9 valid categories', () => {
    const content = fs.readFileSync(path.join(ROOT, 'review', 'greptile-triage.md'), 'utf-8');
    const categories = [
      'race-condition', 'null-check', 'error-handling', 'style',
      'type-safety', 'security', 'performance', 'correctness', 'other',
    ];
    for (const cat of categories) {
      expect(content).toContain(cat);
    }
  });
});

// --- Part 7b: TODOS-format.md reference consistency ---

describe('TODOS-format.md reference consistency', () => {
  test('review/TODOS-format.md exists and defines canonical format', () => {
    const content = fs.readFileSync(path.join(ROOT, 'review', 'TODOS-format.md'), 'utf-8');
    expect(content).toContain('**What:**');
    expect(content).toContain('**Why:**');
    expect(content).toContain('**Priority:**');
    expect(content).toContain('**Effort:**');
    expect(content).toContain('## Completed');
  });

  test('skills that write TODOs reference TODOS-format.md', () => {
    const shipContent = fs.readFileSync(path.join(ROOT, 'ship', 'SKILL.md'), 'utf-8');
    const ceoPlanContent = fs.readFileSync(path.join(ROOT, 'plan-ceo-review', 'SKILL.md'), 'utf-8');
    const engPlanContent = fs.readFileSync(path.join(ROOT, 'plan-eng-review', 'SKILL.md'), 'utf-8');

    expect(shipContent).toContain('TODOS-format.md');
    expect(ceoPlanContent).toContain('TODOS-format.md');
    expect(engPlanContent).toContain('TODOS-format.md');
  });
});

// --- Part 7: Planted-bug fixture validation (A4) ---

describe('Planted-bug fixture validation', () => {
  test('qa-eval ground truth has exactly 5 planted bugs', () => {
    const groundTruth = JSON.parse(
      fs.readFileSync(path.join(ROOT, 'test', 'fixtures', 'qa-eval-ground-truth.json'), 'utf-8')
    );
    expect(groundTruth.bugs).toHaveLength(5);
    expect(groundTruth.total_bugs).toBe(5);
  });

  test('qa-eval-spa ground truth has exactly 5 planted bugs', () => {
    const groundTruth = JSON.parse(
      fs.readFileSync(path.join(ROOT, 'test', 'fixtures', 'qa-eval-spa-ground-truth.json'), 'utf-8')
    );
    expect(groundTruth.bugs).toHaveLength(5);
    expect(groundTruth.total_bugs).toBe(5);
  });

  test('qa-eval-checkout ground truth has exactly 5 planted bugs', () => {
    const groundTruth = JSON.parse(
      fs.readFileSync(path.join(ROOT, 'test', 'fixtures', 'qa-eval-checkout-ground-truth.json'), 'utf-8')
    );
    expect(groundTruth.bugs).toHaveLength(5);
    expect(groundTruth.total_bugs).toBe(5);
  });

  test('qa-eval.html contains the planted bugs', () => {
    const html = fs.readFileSync(path.join(ROOT, 'browse', 'test', 'fixtures', 'qa-eval.html'), 'utf-8');
    // BUG 1: broken link
    expect(html).toContain('/nonexistent-404-page');
    // BUG 2: disabled submit
    expect(html).toContain('disabled');
    // BUG 3: overflow
    expect(html).toContain('overflow: hidden');
    // BUG 4: missing alt
    expect(html).toMatch(/<img[^>]*src="\/logo\.png"[^>]*>/);
    expect(html).not.toMatch(/<img[^>]*src="\/logo\.png"[^>]*alt=/);
    // BUG 5: console error
    expect(html).toContain("Cannot read properties of undefined");
  });

  test('review-eval-vuln.rb contains expected vulnerability patterns', () => {
    const content = fs.readFileSync(path.join(ROOT, 'test', 'fixtures', 'review-eval-vuln.rb'), 'utf-8');
    expect(content).toContain('params[:id]');
    expect(content).toContain('update_column');
  });
});