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-mascot-symbol-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 logoBrief = {
  brand: '陶泥儿',
  coreBelief: '好玩会创造',
  logoType: 'symbol/icon-only mascot mark, no wordmark',
  product:
    'AI UGC 轻休闲小游戏创作与传播平台，用户像捏陶泥一样把脑洞、梗和灵感塑造成可分享的作品',
  direction: '抽象吉祥物符号，从人形、精灵、怪物、动物等形态提炼',
  audience: '女性用户友好、全年龄向、年轻明亮但不低幼',
  mascotRules: [
    '必须是 logo 符号级别，不是完整角色立绘',
    '轮廓要有记忆点，32px 可读',
    '表情最多极简两点或无表情',
    '身体结构要高度抽象、可矢量化',
    '保留一点陶泥被捏出的柔软感',
  ],
  avoid: [
    '复杂角色',
    '儿童玩具感',
    '怪物恐怖感',
    '真实动物',
    '食品感',
    '文字',
    '星星',
    '写实泥土纹理',
  ],
};

const basePrompt = [
  'Create an icon-only mascot logo symbol for the Chinese product named "陶泥儿"; do not render any Chinese, English, letters, numbers, wordmark, tagline, or text.',
  'Brand core belief: fun creation. Users can turn imagination, memes, and ideas into playable AI/UGC casual game works and share them with others.',
  'Logo type: abstract mascot symbol only. It must be a simple brand mark, not a full character illustration, not a scene, not a sticker sheet, not an app-icon rounded-square background.',
  'Mascot meaning: a soft clay-born little being that represents playful creation, shareable ideas, and a friendly AI/UGC companion.',
  'Style: modern minimalist vector mascot mark, compact silhouette, broad simple shapes, fresh bright palette, very light clay warmth only. It must look good and recognizable at 32px favicon size.',
  'Character abstraction: use a highly simplified head/body silhouette or creature glyph. No detailed anatomy. No clothing. No props. No complex limbs. Optional face should be extremely minimal, at most two small eyes; no mouth unless it is a tiny simple mark.',
  'Shape language: soft, rounded, slightly irregular, as if gently pinched from clay, but clean and designer-ready. Friendly and memorable, not childish.',
  'Color direction: women-friendly and all-age fresh palette: coral orange, peach pink, cream white, clear soft teal or mint green. Use flat brand-color shapes, not candy rendering.',
  'Avoid realistic clay texture, dirty clay, brick, pottery shard, mud pie, rough craft class object, and archaeology stamp feeling.',
  'Food avoidance: do not make it look like bread, mochi, dumpling, cake, cookie, candy, jelly, donut, dessert, or food packaging.',
  'Avoid scary monster, aggressive teeth, claws, realistic animal, pet-shop icon, emoji face, toy mascot, chibi over-detailing, or generic blob.',
  'No star, no spark, no halo, no magic wand, no hand, no pottery tool, no UI, no border, no watermark.',
  'Composition: centered on a clean light background, generous safe area. Use simple readable silhouette first.',
  'Validation targets: black-and-white version should still read clearly; the mascot silhouette should be recognizable at 32px.',
];

const variants = [
  {
    id: '01-clay-humanoid',
    title: '抽象人形',
    prompt: [
      ...basePrompt,
      'Variant focus: abstract humanoid mascot. A tiny soft clay person-like glyph with rounded head and merged body, no limbs or very minimal arms, friendly but not childish.',
    ],
  },
  {
    id: '02-clay-sprite',
    title: '陶泥精灵',
    prompt: [
      ...basePrompt,
      'Variant focus: clay sprite. A small semi-dome spirit with a gentle lifted silhouette, like a friendly creative helper, no wings, no magic stars, no fantasy clutter.',
    ],
  },
  {
    id: '03-soft-monster',
    title: '软萌怪物',
    prompt: [
      ...basePrompt,
      'Variant focus: soft friendly monster glyph. Cute but not scary, no teeth, no claws, one distinctive head shape, perhaps tiny horn-like soft bumps but not devilish.',
    ],
  },
  {
    id: '04-animal-abstract',
    title: '抽象动物',
    prompt: [
      ...basePrompt,
      'Variant focus: abstract animal-like mascot. Suggest a small rounded creature through ears or tail-like curves, but not a specific real animal and not pet logo.',
    ],
  },
  {
    id: '05-clay-orb-being',
    title: '泥团小灵',
    prompt: [
      ...basePrompt,
      'Variant focus: orb-like clay being. A simple irregular rounded body with minimal face or no face, strong silhouette, playful creation companion.',
    ],
  },
  {
    id: '06-playful-creature',
    title: '轻玩小怪',
    prompt: [
      ...basePrompt,
      'Variant focus: more playful creature mark. Dynamic but compact, one distinctive asymmetric curve, readable at 32px, still premium and not a toy brand.',
    ],
  },
  {
    id: '07-avatar-readable',
    title: '头像可读',
    prompt: [
      ...basePrompt,
      'Variant focus: social avatar and favicon readability. Bold compact mascot head/body silhouette, minimal inner detail, high black-and-white clarity.',
    ],
  },
  {
    id: '08-vector-ready',
    title: '矢量符号感',
    prompt: [
      ...basePrompt,
      'Variant focus: designer-ready vector mascot concept. 2-3 flat shapes, crisp boundaries, distinctive silhouette, minimal material cue, no illustration shading.',
    ],
  },
];

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-mascot-symbol-${variant.id}.${image.extension}`);
  writeFileSync(outputPath, image.bytes);
  return outputPath;
}

function writeManifest(files) {
  const manifestPath = path.join(outputDir, 'taonier-logo-mascot-symbol-manifest.json');
  writeFileSync(
    manifestPath,
    `${JSON.stringify(
      {
        model: 'gpt-image-2-all',
        size: '1024x1024',
        generatedAt: new Date().toISOString(),
        logoSkillSummary: {
          requiredReview: 'visual inspection, 32px readability, black-white viability',
          outputStatus: 'AI concept only; final logo needs vector cleanup',
        },
        brief: logoBrief,
        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,
        brief: logoBrief,
        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,
  ),
);