import { Buffer } from 'node:buffer';
import { existsSync, mkdirSync, readFileSync, writeFileSync } from 'node:fs';
import path from 'node:path';
import { fileURLToPath } from 'node:url';

const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);
const repoRoot = path.resolve(__dirname, '..');
const outputDir = path.join(
  repoRoot,
  'public',
  'branding',
  'taonier-logo-flow-concepts',
);
const timeoutMsDefault = 180000;

const args = new Map();
for (let index = 2; index < process.argv.length; index += 1) {
  const raw = process.argv[index];
  if (!raw.startsWith('--')) {
    continue;
  }
  const next = process.argv[index + 1];
  if (next && !next.startsWith('--')) {
    args.set(raw, next);
    index += 1;
  } else {
    args.set(raw, true);
  }
}

const basePrompt = [
  '请生成一枚全新的「陶泥儿」产品商标图形标概念稿，但画面中绝对不要出现任何中文字、英文字母、数字、符号字样或品牌字标。',
  '产品定位：精品 AI UGC 轻休闲小游戏创作与传播平台，用户可以像捏陶泥一样把脑洞、梗和灵感塑造成小游戏或趣味内容。',
  '这次必须彻底放弃方形底和中心星星：不要整体方形、不要圆角方块、不要 App 图标底板、不要中间星形、不要五角星、不要四角星、不要闪光、不要中心挖孔星。',
  '核心隐喻：连续的陶泥曲线。用一整块顺滑、亲和、可塑的陶泥大结构来表达「脑洞被揉开、灵感流动、内容成型」，图形要像一个完整的流动符号，而不是底板加中心图案。',
  '主结构：由平滑曲线组成的大轮廓，可以像柔软泥流、脑洞涟漪、捏合的回环、温和的旋拧、单线团块或开放结。整体必须连贯、圆润、有亲和力，不能分裂成多个碎片。',
  '风格：现代扁平矢量商标，轻微哑光陶泥质感；边缘干净、曲线饱满、负形明确，适合商标、App 图标、社区头像和启动页。',
  '配色：暖陶白、浅陶土、陶土橙、暖棕为主，可加入少量低饱和孔雀青或深泥灰作为曲线内侧阴影或小连接点。颜色要温暖、有吸引力，但不要糖果色。',
  '识别度：远看必须能记住一个独特的大曲线轮廓；不要靠中心图案识别。缩小到 64px 时仍能看出整体曲线姿态。',
  '亲和力：整体像可以被揉捏的柔软小世界，有陪伴感和创作感，但不要做成脸、表情、角色或吉祥物。',
  '禁止：方形底、圆角方块、中心星星、任何星形、闪光、徽章、印章、砖块、泥饼、石头、陶片、饼干、糖果、手、陶艺工具、笔刷、复杂场景、按钮、UI、边框、水印、文字。',
];

const variants = [
  {
    id: '01-soft-ribbon-loop',
    title: '柔泥回环',
    prompt: [
      ...basePrompt,
      '本张重点：一条宽厚柔软的陶泥带形成开放回环，像脑洞被揉开。轮廓连续，内部负形自然，不出现星形或方形底。',
    ],
  },
  {
    id: '02-clay-wave-knot',
    title: '陶泥波结',
    prompt: [
      ...basePrompt,
      '本张重点：像一个温和波浪结，由 2 条互相捏合的平滑曲线组成，但必须视觉上像一个整体符号，不要碎片化。',
    ],
  },
  {
    id: '03-imagination-ripple',
    title: '脑洞涟漪',
    prompt: [
      ...basePrompt,
      '本张重点：用一整块陶泥曲面形成涟漪状大轮廓，中间负形像柔和水滴或脑洞入口，不能像星星。',
    ],
  },
  {
    id: '04-friendly-clay-comet',
    title: '亲和泥流',
    prompt: [
      ...basePrompt,
      '本张重点：亲和泥流。整体像一个流动的陶泥小世界，前端圆润、尾部自然收束，有动势但不尖锐。',
    ],
  },
  {
    id: '05-single-stroke-blob',
    title: '单笔团块',
    prompt: [
      ...basePrompt,
      '本张重点：单笔成型。像用一笔连续曲线捏出的陶泥团，结构极简但有记忆点，适合后续矢量化。',
    ],
  },
  {
    id: '06-two-tone-soft-flow',
    title: '双色软流',
    prompt: [
      ...basePrompt,
      '本张重点：双色曲线。暖陶白主体配少量孔雀青或陶土橙内侧曲线，让图形更吸引人，但不能变成多片拼贴。',
    ],
  },
  {
    id: '07-open-clay-orbit',
    title: '开放泥环',
    prompt: [
      ...basePrompt,
      '本张重点：开放式泥环。不是闭合圆，也不是旋涡旧稿，而是一枚有缺口和呼吸感的平滑陶泥环形符号。',
    ],
  },
  {
    id: '08-brand-flow-glyph',
    title: '品牌曲线符',
    prompt: [
      ...basePrompt,
      '本张重点：最终品牌符号潜力。减少材质和细节，用 1 到 2 个大曲线色块形成独特、亲和、可注册的图形标。',
    ],
  },
];

function readDotenv(fileName) {
  const filePath = path.join(repoRoot, fileName);
  if (!existsSync(filePath)) {
    return {};
  }

  const values = {};
  for (const line of readFileSync(filePath, 'utf8').split(/\r?\n/u)) {
    const trimmed = line.trim();
    if (!trimmed || trimmed.startsWith('#')) {
      continue;
    }
    const match = /^([A-Za-z_][A-Za-z0-9_]*)=(.*)$/u.exec(trimmed);
    if (!match) {
      continue;
    }
    let value = match[2].trim();
    if (
      (value.startsWith('"') && value.endsWith('"')) ||
      (value.startsWith("'") && value.endsWith("'"))
    ) {
      value = value.slice(1, -1);
    }
    values[match[1]] = value;
  }
  return values;
}

function resolveEnv() {
  const loaded = {
    ...readDotenv('.env.example'),
    ...readDotenv('.env.local'),
    ...readDotenv('.env.secrets.local'),
    ...process.env,
  };
  return {
    baseUrl: String(loaded.VECTOR_ENGINE_BASE_URL || '')
      .trim()
      .replace(/\/+$/u, ''),
    apiKey: String(loaded.VECTOR_ENGINE_API_KEY || '').trim(),
    timeoutMs: Number.parseInt(
      String(loaded.VECTOR_ENGINE_IMAGE_REQUEST_TIMEOUT_MS || timeoutMsDefault),
      10,
    ),
  };
}

function buildVectorEngineImagesGenerationUrl(baseUrl) {
  return baseUrl.endsWith('/v1')
    ? `${baseUrl}/images/generations`
    : `${baseUrl}/v1/images/generations`;
}

function buildRequestBody(variant) {
  return {
    model: 'gpt-image-2-all',
    prompt: variant.prompt.join('\n'),
    n: 1,
    size: '1024x1024',
  };
}

function collectStringsByKey(value, targetKey, output) {
  if (Array.isArray(value)) {
    value.forEach((entry) => collectStringsByKey(entry, targetKey, output));
    return;
  }
  if (!value || typeof value !== 'object') {
    return;
  }

  for (const [key, nested] of Object.entries(value)) {
    if (key === targetKey) {
      if (typeof nested === 'string' && nested.trim()) {
        output.push(nested.trim());
      }
      if (Array.isArray(nested)) {
        nested.forEach((entry) => {
          if (typeof entry === 'string' && entry.trim()) {
            output.push(entry.trim());
          }
        });
      }
    }
    collectStringsByKey(nested, targetKey, output);
  }
}

function extractImageUrls(payload) {
  const urls = [];
  collectStringsByKey(payload, 'url', urls);
  collectStringsByKey(payload, 'image', urls);
  collectStringsByKey(payload, 'image_url', urls);
  return [...new Set(urls)].filter((url) => /^https?:\/\//u.test(url));
}

function extractBase64Images(payload) {
  const values = [];
  collectStringsByKey(payload, 'b64_json', values);
  return values;
}

function inferExtensionFromContentType(contentType) {
  const normalized = contentType.split(';')[0]?.trim().toLowerCase();
  if (normalized === 'image/png') {
    return 'png';
  }
  if (normalized === 'image/webp') {
    return 'webp';
  }
  if (normalized === 'image/gif') {
    return 'gif';
  }
  return 'jpg';
}

function inferExtensionFromBytes(bytes) {
  if (bytes.subarray(0, 8).equals(Buffer.from('\x89PNG\r\n\x1A\n', 'binary'))) {
    return 'png';
  }
  if (bytes.subarray(0, 3).equals(Buffer.from([0xff, 0xd8, 0xff]))) {
    return 'jpg';
  }
  if (
    bytes.subarray(0, 4).toString('ascii') === 'RIFF' &&
    bytes.subarray(8, 12).toString('ascii') === 'WEBP'
  ) {
    return 'webp';
  }
  return 'png';
}

async function fetchJson(url, options, timeoutMs) {
  const abortController = new AbortController();
  const timer = setTimeout(() => abortController.abort(), timeoutMs);
  try {
    const response = await fetch(url, {
      ...options,
      signal: abortController.signal,
    });
    const text = await response.text();
    if (!response.ok) {
      throw new Error(`VectorEngine ${response.status}: ${text.slice(0, 600)}`);
    }
    return JSON.parse(text);
  } catch (error) {
    if (error?.name === 'AbortError') {
      throw new Error(`VectorEngine request timed out after ${timeoutMs}ms`);
    }
    throw error;
  } finally {
    clearTimeout(timer);
  }
}

async function downloadUrl(url, timeoutMs) {
  const abortController = new AbortController();
  const timer = setTimeout(() => abortController.abort(), timeoutMs);
  try {
    const response = await fetch(url, { signal: abortController.signal });
    if (!response.ok) {
      throw new Error(`download ${response.status}`);
    }
    const bytes = Buffer.from(await response.arrayBuffer());
    return {
      bytes,
      extension: inferExtensionFromContentType(
        response.headers.get('content-type') || 'image/jpeg',
      ),
    };
  } catch (error) {
    if (error?.name === 'AbortError') {
      throw new Error(`Generated image download timed out after ${timeoutMs}ms`);
    }
    throw error;
  } finally {
    clearTimeout(timer);
  }
}

async function generateOne(env, variant) {
  const requestBody = buildRequestBody(variant);
  const payload = await fetchJson(
    buildVectorEngineImagesGenerationUrl(env.baseUrl),
    {
      method: 'POST',
      headers: {
        Authorization: `Bearer ${env.apiKey}`,
        Accept: 'application/json',
        'Content-Type': 'application/json',
      },
      body: JSON.stringify(requestBody),
    },
    env.timeoutMs,
  );

  const urls = extractImageUrls(payload);
  const b64Images = extractBase64Images(payload);
  let image;
  if (urls[0]) {
    image = await downloadUrl(urls[0], env.timeoutMs);
  } else if (b64Images[0]) {
    const bytes = Buffer.from(b64Images[0], 'base64');
    image = {
      bytes,
      extension: inferExtensionFromBytes(bytes),
    };
  } else {
    throw new Error(`VectorEngine returned no image for ${variant.id}`);
  }

  mkdirSync(outputDir, { recursive: true });
  const outputPath = path.join(outputDir, `taonier-flow-${variant.id}.${image.extension}`);
  writeFileSync(outputPath, image.bytes);
  return outputPath;
}

function writeManifest(files) {
  const manifestPath = path.join(outputDir, 'taonier-logo-flow-manifest.json');
  writeFileSync(
    manifestPath,
    `${JSON.stringify(
      {
        model: 'gpt-image-2-all',
        size: '1024x1024',
        generatedAt: new Date().toISOString(),
        creativeDirection: {
          name: '陶泥儿连续曲线亲和图形标',
          textPolicy: 'no Chinese, no English, no wordmark',
          correction:
            'no square base, no center star, use one continuous friendly clay curve structure',
          motif: '柔泥回环、脑洞涟漪、开放泥环、品牌曲线符',
        },
        variants: variants.map((variant) => {
          const file = files.find((item) => path.basename(item).includes(variant.id));
          return {
            id: variant.id,
            title: variant.title,
            file: file ? path.basename(file) : null,
            prompt: variant.prompt.join('\n'),
          };
        }),
      },
      null,
      2,
    )}\n`,
    'utf8',
  );
  return manifestPath;
}

const dryRun = args.has('--dry-run') || !args.has('--live');
const limit = Number.parseInt(String(args.get('--limit') || variants.length), 10);
const selectedVariants = variants.slice(0, limit);

if (dryRun) {
  console.log(
    JSON.stringify(
      {
        mode: 'dry-run',
        outputDir,
        count: selectedVariants.length,
        requests: selectedVariants.map((variant) => ({
          id: variant.id,
          title: variant.title,
          body: buildRequestBody(variant),
        })),
      },
      null,
      2,
    ),
  );
  process.exit(0);
}

const env = resolveEnv();
if (!env.baseUrl || !env.apiKey) {
  console.error(
    JSON.stringify({
      ok: false,
      error: 'Missing VECTOR_ENGINE_BASE_URL or VECTOR_ENGINE_API_KEY',
      hasBaseUrl: Boolean(env.baseUrl),
      hasApiKey: Boolean(env.apiKey),
    }),
  );
  process.exit(1);
}

const generated = [];
for (const variant of selectedVariants) {
  console.log(`Generating ${variant.id} ${variant.title}...`);
  generated.push(await generateOne(env, variant));
}

const manifestPath = writeManifest(generated);
console.log(
  JSON.stringify(
    {
      ok: true,
      count: generated.length,
      files: generated,
      manifest: manifestPath,
    },
    null,
    2,
  ),
);