import "server-only";

import { createHash } from "node:crypto";
import { getSystemSetting } from "@/lib/db/queries";
import {
  AGENT_WORKFLOW_MATERIAL_API_CONFIG_KEY,
  buildAgentWorkflowMaterialApiUrl,
  isAgentWorkflowMaterialResourceEnabled,
  normalizeAgentWorkflowMaterialApiConfig,
} from "@/lib/agents/workflow-material-config";
import type {
  AgentWorkflowMaterialQueryType,
  AgentWorkflowMaterialResourceType,
} from "@/types/agent";

type UpstreamMaterialResponse = {
  success?: boolean;
  data?: Record<string, unknown>;
  error?: {
    code?: string;
    message?: string;
  };
};

type UpstreamImageRecord = {
  key?: string;
  label?: string;
  fileName?: string;
  fileSize?: number;
  previewUrl?: string;
  downloadUrl?: string;
};

type ThirdPartyImageMaterialDiagnostics = {
  status: number;
  traceId: string | null;
  serverDurationMs: string | null;
  serverTiming: string | null;
  resourceType: string | null;
  requestSku: string | null;
  requestSpu: string | null;
};

export class ThirdPartyImageMaterialError extends Error {
  readonly code: string;
  readonly status: number;

  constructor(code: string, message: string, status = 500) {
    super(message);
    this.name = "ThirdPartyImageMaterialError";
    this.code = code;
    this.status = status;
  }
}

function sanitizeText(value: unknown, maxLength = 500) {
  return String(value || "").trim().slice(0, maxLength);
}

function normalizeUrlList(value: unknown) {
  if (!Array.isArray(value)) return [];
  return Array.from(
    new Set(
      value
        .map((item) => sanitizeText(item, 2000))
        .filter((item) => /^https?:\/\//i.test(item))
    )
  );
}

function inferMimeTypeFromFilename(filename: string) {
  const normalized = filename.toLowerCase();
  if (normalized.endsWith(".jpg") || normalized.endsWith(".jpeg")) return "image/jpeg";
  if (normalized.endsWith(".webp")) return "image/webp";
  if (normalized.endsWith(".gif")) return "image/gif";
  return "image/png";
}

function getRecord(value: unknown): Record<string, unknown> {
  return value && typeof value === "object" && !Array.isArray(value)
    ? (value as Record<string, unknown>)
    : {};
}

function getDownloadUrls(value: unknown) {
  return getRecord(value).downloadUrls &&
    typeof getRecord(value).downloadUrls === "object" &&
    !Array.isArray(getRecord(value).downloadUrls)
    ? (getRecord(value).downloadUrls as Record<string, unknown>)
    : {};
}

function mapUpstreamErrorStatus(code: string) {
  if (code === "MISSING_PARAM" || code === "RESOURCE_TYPE_INVALID") return 400;
  if (
    code === "SKU_NOT_FOUND" ||
    code === "SPU_NOT_FOUND" ||
    code === "NO_SKUS" ||
    code === "WHITE_BACKGROUND_NOT_FOUND" ||
    code === "TASK_DETAIL_NOT_FOUND" ||
    code === "FULL_SET_NOT_FOUND"
  ) {
    return 404;
  }
  if (code === "SKU_NOT_UNIQUE") return 409;
  if (code === "INVALID_API_KEY") return 500;
  return 502;
}

function readDiagnostics(response: Response): ThirdPartyImageMaterialDiagnostics {
  return {
    status: response.status,
    traceId: response.headers.get("x-trace-id"),
    serverDurationMs: response.headers.get("x-server-duration-ms"),
    serverTiming: response.headers.get("server-timing"),
    resourceType: response.headers.get("x-resource-type"),
    requestSku: response.headers.get("x-request-sku"),
    requestSpu: response.headers.get("x-request-spu"),
  };
}

function mapWhiteBackgroundImage(params: {
  matchedSku: string;
  group: "fixed" | "other";
  sortOrder: number;
  image: UpstreamImageRecord;
}) {
  const previewUrl = sanitizeText(params.image.previewUrl, 2000);
  const downloadUrl = sanitizeText(params.image.downloadUrl, 2000);
  const imageUrl = previewUrl || downloadUrl;
  if (!imageUrl) return null;

  const filename =
    sanitizeText(params.image.fileName, 255) ||
    sanitizeText(params.image.label, 128) ||
    `${params.matchedSku}-${params.group}-${params.sortOrder + 1}.webp`;
  const identityHash = createHash("sha1")
    .update(`${params.group}:${params.sortOrder}:${imageUrl}`, "utf8")
    .digest("hex")
    .slice(0, 12);

  return {
    id: `third-party-${params.group}-${params.sortOrder + 1}-${identityHash}`,
    key: sanitizeText(params.image.key, 64) || `${params.group}-${params.sortOrder + 1}`,
    label: sanitizeText(params.image.label, 128) || `图片${params.sortOrder + 1}`,
    fileName: filename,
    fileSize: Number.isFinite(Number(params.image.fileSize))
      ? Math.max(0, Math.round(Number(params.image.fileSize)))
      : null,
    imageUrl,
    previewUrl: previewUrl || null,
    downloadUrl: downloadUrl || null,
    mimeType: inferMimeTypeFromFilename(filename),
    group: params.group,
    sortOrder: params.sortOrder,
  };
}

function normalizeWhiteBackgroundData(params: {
  query: string;
  queryType: AgentWorkflowMaterialQueryType;
  data: Record<string, unknown>;
}) {
  const data = params.data;
  const matchedSku = sanitizeText(data.sku, 64);
  const matchedSpu =
    sanitizeText(data.spu, 64) || sanitizeText(data.productModel, 128) || null;
  const skuList = Array.isArray(data.skuList) ? data.skuList : [];
  const skuOptions = skuList
    .map((item) => {
      const raw = getRecord(item);
      const skuName = sanitizeText(raw.skuName, 64);
      if (!skuName) return null;
      const previewImage = getRecord(raw.previewImage);
      return {
        skuName,
        skuId: sanitizeText(raw.skuId, 128) || null,
        hasWhiteBackground: raw.hasWhiteBackground === true,
        whiteBackgroundCount: Number.isFinite(Number(raw.whiteBackgroundCount))
          ? Math.max(0, Math.round(Number(raw.whiteBackgroundCount)))
          : 0,
        previewImageUrl: sanitizeText(previewImage.previewUrl, 2000) || null,
        downloadUrl: sanitizeText(previewImage.downloadUrl, 2000) || null,
        previewFileName: sanitizeText(previewImage.fileName, 255) || null,
        previewFileSize: Number.isFinite(Number(previewImage.fileSize))
          ? Math.max(0, Math.round(Number(previewImage.fileSize)))
          : null,
      };
    })
    .filter((item): item is NonNullable<typeof item> => Boolean(item));

  const whiteBackground = getRecord(data.whiteBackground);
  const fixedImages = Array.isArray(whiteBackground.fixed) ? whiteBackground.fixed : [];
  const otherImages = Array.isArray(whiteBackground.other) ? whiteBackground.other : [];
  const images = [
    ...fixedImages.map((image, index) =>
      mapWhiteBackgroundImage({
        matchedSku: matchedSku || params.query,
        group: "fixed",
        sortOrder: index,
        image: getRecord(image),
      })
    ),
    ...otherImages.map((image, index) =>
      mapWhiteBackgroundImage({
        matchedSku: matchedSku || params.query,
        group: "other",
        sortOrder: fixedImages.length + index,
        image: getRecord(image),
      })
    ),
  ].filter((item): item is NonNullable<typeof item> => Boolean(item));

  return {
    resourceType: "white-background" as const,
    query: params.query,
    queryType: params.queryType,
    matchedSku: matchedSku || null,
    matchedSpu,
    materialId: sanitizeText(data.materialId, 128) || null,
    productModel: sanitizeText(data.productModel, 128) || matchedSpu,
    categoryName: sanitizeText(data.categoryName, 128) || null,
    shopName: sanitizeText(data.shopName, 128) || sanitizeText(data.categoryName, 128) || null,
    whiteBackgroundUploaded: data.whiteBackgroundUploaded === true,
    whiteBackgroundComplete: data.whiteBackgroundComplete === true,
    fixedCount: Number.isFinite(Number(data.whiteBackgroundFixedCount))
      ? Math.max(0, Math.round(Number(data.whiteBackgroundFixedCount)))
      : images.filter((item) => item.group === "fixed").length,
    otherCount: Number.isFinite(Number(data.whiteBackgroundOtherCount))
      ? Math.max(0, Math.round(Number(data.whiteBackgroundOtherCount)))
      : images.filter((item) => item.group === "other").length,
    totalCount: Number.isFinite(Number(data.whiteBackgroundCount))
      ? Math.max(0, Math.round(Number(data.whiteBackgroundCount)))
      : images.length || skuOptions.length,
    missingViews: Array.isArray(data.missingViews) ? data.missingViews : [],
    images,
    skuOptions,
    downloadUrls: {
      zip: sanitizeText(getDownloadUrls(data).zip, 2000) || null,
    },
  };
}

function normalizeTaskDetailData(params: {
  query: string;
  queryType: AgentWorkflowMaterialQueryType;
  data: Record<string, unknown>;
}) {
  const candidates = (Array.isArray(params.data.candidates) ? params.data.candidates : [])
    .map((item, index) => {
      const raw = getRecord(item);
      const downloadUrls = getDownloadUrls(raw);
      const mainImageUrls = normalizeUrlList(downloadUrls.main);
      const skuImageUrls = normalizeUrlList(downloadUrls.sku);
      const detailImageUrls = normalizeUrlList(downloadUrls.detail);
      const allImageUrls = normalizeUrlList(downloadUrls.all);
      const mergedAllImageUrls =
        allImageUrls.length > 0
          ? allImageUrls
          : Array.from(new Set([...mainImageUrls, ...skuImageUrls, ...detailImageUrls]));
      const materialId = sanitizeText(raw.materialId, 128) || null;
      const taskNo = sanitizeText(raw.taskNo, 128) || null;
      return {
        id: taskNo || materialId || `candidate-${index + 1}`,
        materialId,
        taskNo,
        productModel: sanitizeText(raw.productModel, 128) || null,
        categoryName: sanitizeText(raw.categoryName, 128) || null,
        shopName: sanitizeText(raw.shopName, 128) || sanitizeText(raw.categoryName, 128) || null,
        sceneName: sanitizeText(raw.sceneName, 128) || null,
        uploadedAt: sanitizeText(raw.uploadedAt, 64) || null,
        isFullSet: raw.isFullSet !== false,
        mainImageUrls,
        skuImageUrls,
        detailImageUrls,
        allImageUrls: mergedAllImageUrls,
      };
    })
    .sort((left, right) => {
      const leftTime = left.uploadedAt ? new Date(left.uploadedAt).getTime() : 0;
      const rightTime = right.uploadedAt ? new Date(right.uploadedAt).getTime() : 0;
      return rightTime - leftTime;
    });

  return {
    resourceType: "task-detail" as const,
    query: params.query,
    queryType: params.queryType,
    matchedSku: sanitizeText(params.data.sku, 64) || null,
    matchedSpu: sanitizeText(params.data.spu, 64) || null,
    categoryName: sanitizeText(params.data.categoryName, 128) || null,
    shopName:
      sanitizeText(params.data.shopName, 128) ||
      sanitizeText(params.data.categoryName, 128) ||
      null,
    candidateCount: Number.isFinite(Number(params.data.candidateCount))
      ? Math.max(0, Math.round(Number(params.data.candidateCount)))
      : candidates.length,
    candidates,
  };
}

export async function getThirdPartyImageMaterialPublicConfig() {
  const setting = await getSystemSetting({
    key: AGENT_WORKFLOW_MATERIAL_API_CONFIG_KEY,
  });
  const config = normalizeAgentWorkflowMaterialApiConfig(setting?.value);

  return {
    enabled: config.enabled,
    endpoint: "/api/third-party-image-materials/search",
    queryTypes: ["sku", "spu"] as const,
    resourceTypes: [
      {
        value: "white-background" as const,
        label: "标准模型白底图",
        enabled:
          config.enabled &&
          isAgentWorkflowMaterialResourceEnabled(config, "white-background"),
      },
      {
        value: "task-detail" as const,
        label: "任务-详情整套预览",
        enabled:
          config.enabled &&
          isAgentWorkflowMaterialResourceEnabled(config, "task-detail"),
      },
    ],
    requestTimeoutMs: config.requestTimeoutMs || 30_000,
  };
}

export async function queryThirdPartyImageMaterials(params: {
  resourceType: AgentWorkflowMaterialResourceType;
  queryType: AgentWorkflowMaterialQueryType;
  keyword: string;
}) {
  const setting = await getSystemSetting({
    key: AGENT_WORKFLOW_MATERIAL_API_CONFIG_KEY,
  });
  const config = normalizeAgentWorkflowMaterialApiConfig(setting?.value);
  const keyword = sanitizeText(params.keyword, 64).toUpperCase();

  if (!config.enabled) {
    throw new ThirdPartyImageMaterialError(
      "MATERIAL_API_DISABLED",
      "第三方图片素材接口未开启，请先在系统设置中启用",
      400
    );
  }
  if (!isAgentWorkflowMaterialResourceEnabled(config, params.resourceType)) {
    throw new ThirdPartyImageMaterialError(
      "RESOURCE_TYPE_DISABLED",
      params.resourceType === "task-detail"
        ? "任务-详情整套素材接口未开启，请先在系统设置中启用"
        : "白底图素材接口未开启，请先在系统设置中启用",
      400
    );
  }
  if (!config.apiKey) {
    throw new ThirdPartyImageMaterialError(
      "MATERIAL_API_KEY_MISSING",
      "第三方图片素材 API Key 未配置，请先在系统设置中保存",
      500
    );
  }
  if (!keyword) {
    throw new ThirdPartyImageMaterialError("MISSING_PARAM", "sku 和 spu 二选一必填", 400);
  }

  const upstreamUrl = buildAgentWorkflowMaterialApiUrl(config, {
    resourceType: params.resourceType,
    queryType: params.queryType,
    keyword,
  });

  let response: Response;
  try {
    response = await fetch(upstreamUrl, {
      method: "GET",
      headers: {
        Accept: "application/json",
        "X-API-Key": config.apiKey,
      },
      cache: "no-store",
      signal: AbortSignal.timeout(config.requestTimeoutMs || 30_000),
    });
  } catch (error) {
    const message = error instanceof Error ? error.message : "上游接口访问失败";
    throw new ThirdPartyImageMaterialError(
      "UPSTREAM_FETCH_FAILED",
      message.includes("timeout") ? "第三方图片素材接口访问超时" : "第三方图片素材接口访问失败",
      message.includes("timeout") ? 504 : 502
    );
  }

  const diagnostics = readDiagnostics(response);
  const upstreamResult = (await response.json().catch(() => ({}))) as UpstreamMaterialResponse;

  if (!response.ok || upstreamResult.success !== true || !upstreamResult.data) {
    const code = sanitizeText(upstreamResult.error?.code, 64) || "UPSTREAM_ERROR";
    const message =
      sanitizeText(upstreamResult.error?.message, 500) ||
      `第三方图片素材接口返回异常(${response.status})`;
    throw new ThirdPartyImageMaterialError(code, message, mapUpstreamErrorStatus(code));
  }

  const data =
    params.resourceType === "task-detail"
      ? normalizeTaskDetailData({
          query: keyword,
          queryType: params.queryType,
          data: upstreamResult.data,
        })
      : normalizeWhiteBackgroundData({
          query: keyword,
          queryType: params.queryType,
          data: upstreamResult.data,
        });

  return {
    success: true,
    data,
    diagnostics,
  };
}