/**
 * Gitea API Client — Lightweight helper for posting test results to Gitea Issues.
 *
 * Auth flow: Basic Auth → create token → use token for API calls.
 *
 * Usage:
 *   const gitea = require('./lib/gitea-client');
 *   await gitea.postComment(issueNumber, body);
 *   await gitea.uploadAttachment(issueNumber, filePath);
 *
 * Environment:
 *   GITEA_API_URL  - API base (default: https://git.softuniq.eu/api/v1)
 *   GITEA_TOKEN    - Pre-existing API token (skips Basic Auth if set)
 *   GITEA_USER     - Username for Basic Auth (default: NW)
 *   GITEA_PASSWORD - Password for Basic Auth (required if no token)
 *   GITEA_REPO     - Repository path (default: UniqueSoft/APAW)
 */

const https = require('https');
const http = require('http');
const fs = require('fs');
const path = require('path');

const GITEA_API_URL = process.env.GITEA_API_URL || 'https://git.softuniq.eu/api/v1';
const GITEA_USER = process.env.GITEA_USER || '';
const GITEA_PASSWORD = process.env.GITEA_PASSWORD || '';
const GITEA_REPO = process.env.GITEA_REPO || 'UniqueSoft/APAW';

let _cachedToken = process.env.GITEA_TOKEN || null;

function request(urlStr, options, body) {
  return new Promise((resolve, reject) => {
    const url = new URL(urlStr);
    const mod = url.protocol === 'https:' ? https : http;
    const opts = {
      hostname: url.hostname,
      port: url.port || (url.protocol === 'https:' ? 443 : 80),
      path: url.pathname + url.search,
      method: options.method || 'GET',
      headers: options.headers || {},
    };
    const req = mod.request(opts, (res) => {
      let data = '';
      res.on('data', chunk => data += chunk);
      res.on('end', () => {
        if (res.statusCode >= 200 && res.statusCode < 300) {
          try { resolve(JSON.parse(data)); } catch { resolve(data); }
        } else {
          reject(new Error(`Gitea API ${res.statusCode}: ${data.slice(0, 300)}`));
        }
      });
    });
    req.on('error', reject);
    if (body) req.write(body);
    req.end();
  });
}

async function getToken() {
  if (_cachedToken) return _cachedToken;

  const credentials = Buffer.from(`${GITEA_USER}:${GITEA_PASSWORD}`).toString('base64');
  const urlStr = `${GITEA_API_URL}/users/${GITEA_USER}/tokens`;
  const body = JSON.stringify({ name: `vt-${Date.now()}`, scopes: ['all'] });

  const result = await request(urlStr, {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
      'Authorization': `Basic ${credentials}`,
    },
  }, body);

  _cachedToken = result.sha1;
  return _cachedToken;
}

async function authHeaders() {
  const token = await getToken();
  return { 'Authorization': `token ${token}`, 'Content-Type': 'application/json' };
}

async function postComment(issueNumber, body) {
  const headers = await authHeaders();
  const url = `${GITEA_API_URL}/repos/${GITEA_REPO}/issues/${issueNumber}/comments`;
  return request(url, { method: 'POST', headers }, JSON.stringify({ body }));
}

async function uploadAttachment(issueNumber, filePath) {
  const token = await getToken();
  const fileContent = fs.readFileSync(filePath);
  const filename = path.basename(filePath);
  const boundary = `----FormBoundary${Date.now()}`;

  let body = `--${boundary}\r\n`.getBytes?.() || Buffer.from(`--${boundary}\r\n`);
  body = Buffer.concat([
    Buffer.from(`--${boundary}\r\n`),
    Buffer.from(`Content-Disposition: form-data; name="attachment"; filename="${filename}"\r\n`),
    Buffer.from(`Content-Type: image/png\r\n\r\n`),
    fileContent,
    Buffer.from(`\r\n--${boundary}--\r\n`),
  ]);

  const url = new URL(`${GITEA_API_URL}/repos/${GITEA_REPO}/issues/${issueNumber}/assets`);
  const mod = url.protocol === 'https:' ? https : http;

  return new Promise((resolve, reject) => {
    const req = mod.request({
      hostname: url.hostname,
      port: url.port || 443,
      path: url.pathname,
      method: 'POST',
      headers: {
        'Authorization': `token ${token}`,
        'Content-Type': `multipart/form-data; boundary=${boundary}`,
        'Content-Length': body.length,
      },
    }, (res) => {
      let data = '';
      res.on('data', chunk => data += chunk);
      res.on('end', () => {
        if (res.statusCode >= 200 && res.statusCode < 300) {
          try { resolve(JSON.parse(data)); } catch { resolve(data); }
        } else {
          reject(new Error(`Gitea upload ${res.statusCode}: ${data.slice(0, 300)}`));
        }
      });
    });
    req.on('error', reject);
    req.write(body);
    req.end();
  });
}

async function uploadAndComment(issueNumber, filePaths, commentBody) {
  const uuids = [];
  for (const fp of filePaths) {
    try {
      const result = await uploadAttachment(issueNumber, fp);
      uuids.push({ filename: path.basename(fp), uuid: result.uuid });
    } catch (err) {
      console.error(`  ⚠️  Upload failed ${path.basename(fp)}: ${err.message}`);
    }
  }

  let fullBody = commentBody;
  if (uuids.length > 0) {
    fullBody += '\n\n### 📸 Screenshots\n\n';
    for (const u of uuids) {
      fullBody += `![${u.filename}](/attachments/${u.uuid})\n`;
    }
  }

  return postComment(issueNumber, fullBody);
}

function formatVisualReport(report) {
  const s = report.summary;
  const lines = [
    '## 📊 Visual Test Results',
    '',
    `**URL**: \`${report.targetUrl}\``,
    `**Pages**: ${report.pages.join(', ')}`,
    `**Viewports**: ${report.viewports.join(', ')}`,
    `**Threshold**: ${report.threshold * 100}%`,
    '',
    '### Summary',
    '',
    `| Metric | Count |`,
    `|--------|-------|`,
    `| Screenshots captured | ${s.screenshotsCaptured} |`,
    `| Screenshots failed | ${s.screenshotsFailed} |`,
    `| Comparisons passed | ${s.comparisonsPassed} |`,
    `| Comparisons failed | ${s.comparisonsFailed} |`,
    `| UI elements extracted | ${s.totalElements} |`,
    `| Console errors | ${s.totalConsoleErrors} |`,
    `| Network errors | ${s.totalNetworkErrors} |`,
    '',
    `**Overall**: ${s.overallPassed ? '✅ PASSED' : '❌ FAILED'}`,
  ];

  if (report.comparison?.length) {
    lines.push('', '### Comparison Details', '');
    lines.push('| Screenshot | Status | Diff % |');
    lines.push('|------------|--------|--------|');
    for (const c of report.comparison) {
      lines.push(`| ${c.filename} | ${c.status === 'PASS' ? '✅' : '❌'} ${c.status} | ${c.diffPercent || 'N/A'} |`);
    }
  }

  if (report.consoleErrors?.length > 0) {
    lines.push('', '### Console Errors', '');
    for (const e of report.consoleErrors.slice(0, 5)) {
      lines.push(`- [${e.page}/${e.viewport}] ${e.error?.slice(0, 120)}`);
    }
    if (report.consoleErrors.length > 5) {
      lines.push(`- ... and ${report.consoleErrors.length - 5} more`);
    }
  }

  if (report.networkErrors?.length > 0) {
    lines.push('', '### Network Errors', '');
    for (const e of report.networkErrors.slice(0, 5)) {
      lines.push(`- [${e.page}/${e.viewport}] ${e.status || e.failure} ${e.url?.slice(0, 80)}`);
    }
    if (report.networkErrors.length > 5) {
      lines.push(`- ... and ${report.networkErrors.length - 5} more`);
    }
  }

  return lines.join('\n');
}

function formatConsoleReport(report) {
  const s = report.summary;
  const lines = [
    '## 📊 Console Error Monitor Results',
    '',
    `**URL**: \`${report.targetUrl}\``,
    `**Pages**: ${report.pages.join(', ')}`,
    '',
    '### Summary',
    '',
    `| Metric | Count |`,
    `|--------|-------|`,
    `| Console errors | ${s.consoleErrors} |`,
    `| Console warnings | ${s.consoleWarnings} |`,
    `| Network errors | ${s.networkErrors} |`,
    `| **Total issues** | **${s.totalIssues}** |`,
    '',
    `**Status**: ${s.totalIssues === 0 ? '✅ CLEAN' : '❌ ISSUES FOUND'}`,
  ];

  if (report.consoleErrors?.length > 0) {
    lines.push('', '### Console Errors', '');
    for (const e of report.consoleErrors.slice(0, 8)) {
      lines.push(`- [${e.page}] ${e.text?.slice(0, 120)}`);
    }
    if (report.consoleErrors.length > 8) {
      lines.push(`- ... and ${report.consoleErrors.length - 8} more`);
    }
  }

  if (report.networkErrors?.length > 0) {
    lines.push('', '### Network Errors', '');
    for (const e of report.networkErrors.slice(0, 8)) {
      lines.push(`- [${e.page}] ${e.status || e.failure} ${e.url?.slice(0, 80)}`);
    }
    if (report.networkErrors.length > 8) {
      lines.push(`- ... and ${report.networkErrors.length - 8} more`);
    }
  }

  return lines.join('\n');
}

module.exports = {
  postComment,
  uploadAttachment,
  uploadAndComment,
  formatVisualReport,
  formatConsoleReport,
};