import "server-only";

import { getAiProvidersByType } from "@/lib/db/queries";
import { TripoApiError, tripoRequest } from "./client";
import type { TripoProviderConfig } from "./types";

const DEFAULT_TRIPO_BASE_URL = "https://api.tripo3d.ai/v2/openapi";
let tripoProviderCursor = 0;

function sanitizeTripoApiKey(value: string): string {
  return String(value || "")
    .replace(/[\u2028\u2029]/g, "")
    .replace(/[\u0000-\u001F\u007F]/g, "")
    .replace(/\s+/g, "")
    .trim();
}

function sanitizeTripoBaseUrl(value: string): string {
  return String(value || "")
    .replace(/[\u2028\u2029]/g, "")
    .replace(/[\u0000-\u001F\u007F]/g, "")
    .trim();
}

function isTripoTaskNotFoundError(error: unknown): error is TripoApiError {
  if (!(error instanceof TripoApiError)) return false;
  if (error.httpStatus === 404) return true;
  const normalizedMessage = String(error.message || "").toLowerCase();
  return (
    normalizedMessage.includes("task is not found") ||
    normalizedMessage.includes("task not found")
  );
}

export async function getTripoProviderConfigs(): Promise<TripoProviderConfig[]> {
  const providers = await getAiProvidersByType({
    type: "tripo-3d",
    enabledOnly: true,
  });

  const normalizedProviders = providers
    .map((provider): TripoProviderConfig | null => {
      const providerApiKey = sanitizeTripoApiKey(String(provider.apiKey || ""));
      if (!providerApiKey) return null;
      return {
        apiKey: providerApiKey,
        baseUrl:
          sanitizeTripoBaseUrl(String(provider.baseUrl || "")) ||
          DEFAULT_TRIPO_BASE_URL,
        providerId: provider.id,
        providerName: provider.name,
      };
    })
    .filter((item): item is TripoProviderConfig => Boolean(item));

  if (normalizedProviders.length > 0) {
    return normalizedProviders;
  }

  const envApiKey = sanitizeTripoApiKey(String(process.env.TRIPO_API_KEY || ""));
  if (!envApiKey) {
    return [];
  }

  return [
    {
      apiKey: envApiKey,
      baseUrl:
        sanitizeTripoBaseUrl(String(process.env.TRIPO_BASE_URL || "")) ||
        DEFAULT_TRIPO_BASE_URL,
      providerName: "TRIPO_API_KEY",
    },
  ];
}

export async function getTripoProviderConfig(
  preferredProviderId?: string | null,
): Promise<TripoProviderConfig> {
  const providers = await getTripoProviderConfigs();
  const normalizedPreferredProviderId = String(preferredProviderId || "").trim();

  if (normalizedPreferredProviderId) {
    const matchedProvider = providers.find(
      (provider) => provider.providerId === normalizedPreferredProviderId,
    );
    if (matchedProvider) return matchedProvider;
  }

  const tripoProvider =
    providers.length > 0
      ? providers[tripoProviderCursor % providers.length]
      : null;
  if (providers.length > 0) {
    tripoProviderCursor = (tripoProviderCursor + 1) % providers.length;
  }
  if (tripoProvider) return tripoProvider;

  throw new Error("未配置 Tripo3D API，请在系统设置-本地AI新增 Tripo3D 提供商");
}

export async function resolveTripoProviderConfigForTaskId(
  taskId: string,
  preferredProviderId?: string | null,
): Promise<TripoProviderConfig> {
  const normalizedTaskId = String(taskId || "").trim();
  if (!normalizedTaskId) {
    return getTripoProviderConfig(preferredProviderId);
  }

  const providers = await getTripoProviderConfigs();
  if (providers.length <= 1) {
    return getTripoProviderConfig(preferredProviderId);
  }

  const normalizedPreferredProviderId = String(preferredProviderId || "").trim();
  const preferredProvider = normalizedPreferredProviderId
    ? providers.find((provider) => provider.providerId === normalizedPreferredProviderId)
    : null;
  const orderedProviders = preferredProvider
    ? [
        preferredProvider,
        ...providers.filter(
          (provider) => provider.providerId !== preferredProvider.providerId,
        ),
      ]
    : providers;

  let lastTaskNotFoundError: TripoApiError | null = null;
  let lastUnexpectedError: unknown = null;

  for (const provider of orderedProviders) {
    try {
      await tripoRequest<Record<string, unknown>>(provider, {
        method: "GET",
        path: `/task/${encodeURIComponent(normalizedTaskId)}`,
      });
      return provider;
    } catch (error) {
      if (isTripoTaskNotFoundError(error)) {
        lastTaskNotFoundError = error;
        continue;
      }
      lastUnexpectedError = error;
    }
  }

  if (lastUnexpectedError) {
    throw lastUnexpectedError;
  }
  if (lastTaskNotFoundError) {
    throw lastTaskNotFoundError;
  }
  return getTripoProviderConfig(preferredProviderId);
}