'use strict';

const axios = require('axios');
const { uploadBufferToDefaultS3 } = require('./objectStorage');
const { getSelectionFissionImageGenerationConfig } = require('./selectionFissionAiSettings');

const QWEN_GENERATION_PATH = '/api/v1/services/aigc/multimodal-generation/generation';

function normalizeText(value, maxLength = 1000) {
  return String(value ?? '').trim().slice(0, maxLength);
}

function stripTrailingSlash(value) {
  return normalizeText(value, 1000).replace(/\/+$/, '');
}

function getProviderConfig(config) {
  const provider = config?.provider === 'qwen' ? 'qwen' : 'external';
  return { provider, ...(config?.[provider] || {}), timeoutMs: config?.timeoutMs };
}

function resolveQwenImageDimensions() {
  return '800*800';
}

function getRequestErrorMessage(error, fallback = '生图请求失败') {
  return normalizeText(
    error?.response?.data?.error?.message
      || error?.response?.data?.message
      || error?.response?.data?.error
      || error?.message
      || fallback,
    1000
  ) || fallback;
}

async function persistQwenImage(imageUrl, timeoutMs) {
  const response = await axios.get(imageUrl, {
    responseType: 'arraybuffer',
    timeout: Math.min(Number(timeoutMs) || 120000, 120000),
    maxContentLength: 20 * 1024 * 1024,
  });
  const mimeType = normalizeText(response.headers?.['content-type'], 120).split(';')[0] || 'image/png';
  const extension = mimeType.includes('jpeg') ? 'jpg' : (mimeType.split('/')[1] || 'png');
  const uploaded = await uploadBufferToDefaultS3(
    Buffer.from(response.data),
    mimeType,
    'selection-fission/generated-images',
    extension
  );
  return uploaded.url;
}

async function requestExternalImage(providerConfig, input) {
  const response = await axios.post(`${stripTrailingSlash(providerConfig.baseUrl)}/api/external/image/generate`, {
    prompt: input.prompt,
    negativePrompt: input.negativePrompt,
    imageCount: 1,
    aspectRatio: '1:1',
    imageSize: '1K',
    width: 800,
    height: 800,
    referenceImages: input.referenceImages,
    metadata: input.metadata,
  }, {
    timeout: providerConfig.timeoutMs,
    headers: {
      Authorization: `Bearer ${providerConfig.apiKey}`,
      'x-api-key': providerConfig.apiKey,
      'Content-Type': 'application/json',
    },
    maxBodyLength: 15 * 1024 * 1024,
  });
  const responseImages = response.data?.data?.images || response.data?.images || [];
  const first = Array.isArray(responseImages) ? responseImages[0] : null;
  return {
    imageUrl: normalizeText(first?.originalUrl || first?.url || first?.thumbnailUrl, 4000),
    requestId: normalizeText(response.data?.data?.requestId || response.data?.requestId, 160),
    provider: 'external',
    model: providerConfig.model || 'provider-default',
    raw: response.data,
  };
}

async function requestQwenImage(providerConfig, input, dependencies = {}) {
  const post = dependencies.post || axios.post;
  const persistImage = dependencies.persistImage || persistQwenImage;
  const content = input.referenceImages.slice(0, 3).map((imageUrl) => ({ image: imageUrl }));
  content.push({ text: input.prompt });
  const response = await post(
    `${stripTrailingSlash(providerConfig.baseUrl)}${QWEN_GENERATION_PATH}`,
    {
      model: providerConfig.model,
      input: { messages: [{ role: 'user', content }] },
      parameters: {
        n: 1,
        negative_prompt: normalizeText(input.negativePrompt, 500),
        prompt_extend: input.metadata?.disablePromptExtend === true
          ? false
          : providerConfig.promptExtend !== false,
        watermark: Boolean(providerConfig.watermark),
        size: resolveQwenImageDimensions(input.aspectRatio, providerConfig.imageSize),
      },
    },
    {
      timeout: providerConfig.timeoutMs,
      headers: {
        Authorization: `Bearer ${providerConfig.apiKey}`,
        'Content-Type': 'application/json',
      },
      maxBodyLength: 30 * 1024 * 1024,
    }
  );
  const contentRows = response.data?.output?.choices?.[0]?.message?.content || [];
  const temporaryImageUrl = Array.isArray(contentRows)
    ? normalizeText(contentRows.find((row) => row?.image)?.image, 4000)
    : '';
  if (!temporaryImageUrl) {
    const error = new Error(response.data?.message || '千问生图接口未返回图片');
    error.code = response.data?.code || 'QWEN_IMAGE_EMPTY';
    throw error;
  }
  const imageUrl = await persistImage(temporaryImageUrl, providerConfig.timeoutMs);
  return {
    imageUrl,
    requestId: normalizeText(response.data?.request_id, 160),
    provider: 'qwen',
    model: providerConfig.model,
    usage: response.data?.usage || null,
    raw: response.data,
  };
}

async function generateSelectionImage(input = {}) {
  const config = await getSelectionFissionImageGenerationConfig();
  const providerConfig = { ...getProviderConfig(config), imageSize: '1K' };
  if (!providerConfig.baseUrl || !providerConfig.apiKey) {
    const error = new Error(
      providerConfig.provider === 'qwen'
        ? '千问生图服务尚未配置 API Key'
        : '现有生图服务尚未配置 API Key'
    );
    error.status = 409;
    error.code = 'SELECTION_IMAGE_API_KEY_MISSING';
    throw error;
  }
  try {
    return providerConfig.provider === 'qwen'
      ? await requestQwenImage(providerConfig, input)
      : await requestExternalImage(providerConfig, input);
  } catch (error) {
    if (error.code === 'SELECTION_IMAGE_API_KEY_MISSING') throw error;
    const wrapped = new Error(
      `${providerConfig.provider === 'qwen' ? '千问官方' : '现有第三方'}生图失败：${getRequestErrorMessage(error)}`
    );
    wrapped.status = error.response?.status || error.status || 502;
    wrapped.code = error.response?.data?.code || error.code || 'SELECTION_IMAGE_REQUEST_FAILED';
    throw wrapped;
  }
}

async function testSelectionImageGenerationConfig() {
  const config = await getSelectionFissionImageGenerationConfig();
  const providerConfig = getProviderConfig(config);
  if (!providerConfig.apiKey) {
    const error = new Error(providerConfig.provider === 'qwen'
      ? '千问生图服务尚未配置 API Key'
      : '现有生图服务尚未配置 API Key');
    error.status = 409;
    throw error;
  }
  const input = {
    prompt: '生成一张简洁的白色摄影棚背景测试图，不要文字、图标或水印。',
    negativePrompt: '文字，水印，标志，复杂物体',
    aspectRatio: '1:1',
    referenceImages: providerConfig.provider === 'qwen'
      ? []
      : ['https://help-static-aliyun-doc.aliyuncs.com/file-manage-files/zh-CN/20260310/jiydyi/image+%2818%29-2026-03-10-16-39-59.webp'],
    metadata: { task: 'settings_connection_test' },
  };
  const result = providerConfig.provider === 'qwen'
    ? await requestQwenImage({ ...providerConfig, imageSize: '1K' }, input)
    : await requestExternalImage({ ...providerConfig, imageSize: '1K' }, input);
  return {
    provider: result.provider,
    model: result.model,
    imageUrl: result.imageUrl,
    requestId: result.requestId,
    message: '生图服务连接成功',
  };
}

module.exports = {
  QWEN_GENERATION_PATH,
  generateSelectionImage,
  getProviderConfig,
  requestExternalImage,
  requestQwenImage,
  resolveQwenImageDimensions,
  testSelectionImageGenerationConfig,
};