#!/usr/bin/env node
/**
 * Upload overview screenshots to a Gitea issue and update its attachment index.
 * The manifest is produced by the preview step and contains local PNG paths and hashes.
 */
import { existsSync, readFileSync } from 'node:fs';
import { resolve } from 'node:path';
import {
  ScriptError,
  expectOk,
  fetchIssue,
  giteaRequest,
  giteaUpload,
  main,
  parseFlags,
  parseIndex,
  parseRepo,
  preflight,
  resolveLogin,
} from './lib.js';
import { upsertLineInSection } from './issue-body.js';

const INDEX_LINE = '圖解版總覽附件：';

main(async () => {
  const flags = parseFlags(process.argv.slice(2), {
    required: ['repo', 'index', 'manifest'],
    optional: ['host'],
    booleans: ['dry-run'],
  });
  const repo = parseRepo(flags.repo);
  const index = parseIndex(flags.index);
  const manifest = JSON.parse(readFileSync(resolve(flags.manifest), 'utf8'));
  const screenshots = manifest.screenshots;
  if (!Array.isArray(screenshots) || screenshots.length === 0) {
    throw new ScriptError('MANIFEST_INVALID', 'manifest 必須包含至少一張 screenshots');
  }
  for (const item of screenshots) {
    if (!item.role || !item.path || !item.fileName || !item.sha256 || !existsSync(resolve(item.path))) {
      throw new ScriptError('MANIFEST_INVALID', '每張截圖都必須有 role、path、fileName、sha256 且檔案存在');
    }
  }
  const login = resolveLogin({ host: flags.host });
  const issuePath = `/repos/${repo}/issues/${index}`;
  const assetsPath = `${issuePath}/assets`;
  if (flags['dry-run']) {
    return {
      dryRun: true,
      repo,
      index,
      requests: [
        { method: 'GET', path: issuePath },
        { method: 'GET', path: assetsPath },
        ...screenshots.map((item) => ({ method: 'POST', path: assetsPath, file: item.path })),
      ],
    };
  }
  await preflight(login, repo);
  const issue = await fetchIssue(login, repo, index);
  const assets = expectOk(await giteaRequest(login, 'GET', assetsPath), `GET ${assetsPath}`);
  const existing = Array.isArray(assets) ? assets : [];
  const indexed = parseIndexedAssets(issue.body ?? '');
  const uploaded = [];
  for (const item of screenshots) {
    const indexedAsset = indexed.find((asset) => asset.fileName === item.fileName && asset.sha256 === item.sha256);
    const existingAsset = existing.find((asset) => asset.name === item.fileName && asset.sha256 === item.sha256);
    const asset = indexedAsset ?? existingAsset;
    if (asset) {
      uploaded.push({ ...item, url: asset.url ?? asset.browser_download_url ?? asset.download_url, reused: true });
      continue;
    }
    const response = expectOk(
      await giteaUpload(login, `${assetsPath}?name=${encodeURIComponent(item.fileName)}`, resolve(item.path), item.fileName),
      `POST ${assetsPath}`,
    );
    uploaded.push({ ...item, url: response.browser_download_url ?? response.download_url, reused: false });
  }
  const body = updateIndex(issue.body ?? '', uploaded);
  const update = body === issue.body ? null : expectOk(await giteaRequest(login, 'PATCH', issuePath, { body: { body } }), `PATCH ${issuePath}`);
  return { repo, index, uploaded, updated: update !== null, url: update?.html_url ?? issue.html_url };
});

function parseIndexedAssets(body) {
  const line = body.split('\n').find((row) => row.startsWith(INDEX_LINE)) ?? '';
  return [...line.matchAll(/([^=；\s]+)=([^；\s]+)\s+sha256=([a-f0-9]{64})\s+(\S+)/g)].map((match) => ({
    role: match[1],
    fileName: match[2],
    sha256: match[3],
    url: match[4],
  }));
}

function updateIndex(body, assets) {
  const lines = assets.map((asset) => `${asset.role}=${asset.fileName} sha256=${asset.sha256} ${asset.url ?? '(網址未回傳)'}`);
  return upsertLineInSection(body, '總覽', `${INDEX_LINE}${lines.join('；')}`);
}