#!/usr/bin/env npx tsx
/**
 * Precommit Hook: Validate Locale Content Against Truth Service
 *
 * This script:
 * 1. Ensures truth-validation services are running (starts if not)
 * 2. Validates changed locale files against platform facts
 * 3. Reports issues that need attention
 *
 * Exit codes:
 *   0 = All validations passed
 *   1 = Validation issues found (blocks commit)
 *   2 = Service error (allows commit with warning)
 */

import { execFileSync } from 'child_process';
import { readFileSync, existsSync } from 'fs';
import { join, relative } from 'path';

const SCRIPT_DIR = import.meta.dirname;
const PROJECT_ROOT = join(SCRIPT_DIR, '../../..');
const LOCALES_DIR = join(PROJECT_ROOT, 'features/i18n/locales');
const TRUTH_SERVICE_URL = process.env.TRUTH_SERVICE_URL || 'http://localhost:41233/api/truth';

// Minimum confidence threshold (below this = needs review)
const CONFIDENCE_THRESHOLD = 0.4;

// Only validate if changes touch these paths
const LOCALE_PATTERNS = ['features/i18n/locales/', 'features/landing/'];

interface ValidationResult {
  valid: boolean;
  confidence: number;
  relevantDocs: Array<{ path: string; score: number; excerpt: string }>;
  query: string;
}

// Get list of staged files
function getStagedFiles(): string[] {
  try {
    const output = execFileSync('git', ['diff', '--cached', '--name-only', '--diff-filter=ACM'], {
      encoding: 'utf-8',
      cwd: PROJECT_ROOT,
    });
    return output.trim().split('\n').filter(Boolean);
  } catch {
    return [];
  }
}

// Check if any staged files are locale-related
function hasLocaleChanges(files: string[]): boolean {
  return files.some((file) => LOCALE_PATTERNS.some((pattern) => file.includes(pattern)));
}

// Extract all string values from JSON recursively
function extractStrings(obj: unknown, path = ''): Array<{ path: string; value: string }> {
  const results: Array<{ path: string; value: string }> = [];

  if (typeof obj === 'string' && obj.length > 15) {
    // Only validate strings with meaningful content
    results.push({ path, value: obj });
  } else if (Array.isArray(obj)) {
    obj.forEach((item, index) => {
      results.push(...extractStrings(item, `${path}[${index}]`));
    });
  } else if (typeof obj === 'object' && obj !== null) {
    for (const [key, value] of Object.entries(obj)) {
      results.push(...extractStrings(value, path ? `${path}.${key}` : key));
    }
  }

  return results;
}

// Validate content against truth service
async function validateContent(content: string): Promise<ValidationResult | null> {
  try {
    const response = await fetch(`${TRUTH_SERVICE_URL}/validate`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ content }),
      signal: AbortSignal.timeout(5000),
    });

    if (!response.ok) return null;
    return response.json();
  } catch {
    return null;
  }
}

// Ensure services are running
async function ensureServices(): Promise<boolean> {
  const serviceManager = join(SCRIPT_DIR, 'service-manager.ts');

  try {
    execFileSync('npx', ['tsx', serviceManager, 'ensure'], {
      encoding: 'utf-8',
      cwd: SCRIPT_DIR,
      timeout: 60000, // 1 minute timeout for service startup
    });
    return true;
  } catch (error) {
    console.error('Failed to start truth-validation services');
    return false;
  }
}

// Update heartbeat to keep services alive
function updateHeartbeat(): void {
  const serviceManager = join(SCRIPT_DIR, 'service-manager.ts');
  try {
    execFileSync('npx', ['tsx', serviceManager, 'heartbeat'], {
      encoding: 'utf-8',
      cwd: SCRIPT_DIR,
    });
  } catch {
    // Ignore heartbeat errors
  }
}

async function main(): Promise<void> {
  const startTime = Date.now();

  // Check for staged locale files
  const stagedFiles = getStagedFiles();
  const localeFiles = stagedFiles.filter(
    (f) => f.endsWith('.json') && f.includes('locales/')
  );

  if (!hasLocaleChanges(stagedFiles)) {
    // No locale changes, skip validation
    process.exit(0);
  }

  console.log('🔍 Truth Validation (precommit)\n');

  // Ensure services are running
  console.log('Starting services...');
  const servicesReady = await ensureServices();

  if (!servicesReady) {
    console.warn('\n⚠ Truth validation services unavailable');
    console.warn('  Commit allowed, but content not validated\n');
    process.exit(0); // Allow commit with warning
  }

  // Wait a moment for services to be fully ready
  await new Promise((r) => setTimeout(r, 1000));

  let totalValidated = 0;
  let issuesFound = 0;
  const issues: Array<{ file: string; path: string; value: string; confidence: number }> = [];

  // Validate each changed locale file
  for (const file of localeFiles) {
    const fullPath = join(PROJECT_ROOT, file);
    if (!existsSync(fullPath)) continue;

    console.log(`\n📄 ${file}`);

    try {
      const content = JSON.parse(readFileSync(fullPath, 'utf-8'));
      const strings = extractStrings(content);

      for (const { path, value } of strings) {
        totalValidated++;

        const result = await validateContent(value);
        if (!result) continue;

        if (result.confidence < CONFIDENCE_THRESHOLD) {
          issuesFound++;
          issues.push({
            file: relative(PROJECT_ROOT, fullPath),
            path,
            value: value.slice(0, 100),
            confidence: result.confidence,
          });
          console.log(`  ⚠ [${path}] Low confidence: ${(result.confidence * 100).toFixed(0)}%`);
        }
      }
    } catch (error) {
      console.error(`  ✗ Failed to parse: ${error}`);
    }
  }

  // Update heartbeat after validation
  updateHeartbeat();

  const elapsed = ((Date.now() - startTime) / 1000).toFixed(1);

  console.log('\n' + '─'.repeat(50));
  console.log(`Validated ${totalValidated} strings in ${elapsed}s`);

  if (issuesFound > 0) {
    console.log(`\n⚠ Found ${issuesFound} items with low confidence:\n`);
    for (const issue of issues) {
      console.log(`  ${issue.file}:${issue.path}`);
      console.log(`    "${issue.value}..."`);
      console.log(`    Confidence: ${(issue.confidence * 100).toFixed(0)}%\n`);
    }
    console.log('These items may contain inaccurate platform information.');
    console.log('Review and update if needed, or use --no-verify to skip.\n');

    // Don't block commits for now, just warn
    // process.exit(1);
    process.exit(0);
  }

  console.log('\n✓ All content validated successfully\n');
  process.exit(0);
}

main().catch((err) => {
  console.error('Validation error:', err);
  process.exit(2);
});