import type { NextConfig } from "next";
import withSerwistInit from "@serwist/next";
import { PHASE_PRODUCTION_BUILD } from "next/constants.js";
import pkg from "./package.json";

const BUILD_MODE = process.env.NEXT_PUBLIC_BUILD_MODE;
// AI provider API base url
const API_PROXY_BASE_URL = process.env.API_PROXY_BASE_URL || "";
const GOOGLE_GENERATIVE_AI_API_BASE_URL =
  process.env.GOOGLE_GENERATIVE_AI_API_BASE_URL ||
  "https://generativelanguage.googleapis.com";
const OPENROUTER_API_BASE_URL =
  process.env.OPENROUTER_API_BASE_URL || "https://openrouter.ai/api";
const OPENAI_API_BASE_URL =
  process.env.OPENAI_API_BASE_URL || "https://api.openai.com";
const ANTHROPIC_API_BASE_URL =
  process.env.ANTHROPIC_API_BASE_URL || "https://api.anthropic.com";
const DEEPSEEK_API_BASE_URL =
  process.env.DEEPSEEK_API_BASE_URL || "https://api.deepseek.com";
const XAI_API_BASE_URL = process.env.XAI_API_BASE_URL || "https://api.x.ai";
const MISTRAL_API_BASE_URL =
  process.env.MISTRAL_API_BASE_URL || "https://api.mistral.ai";
const AZURE_API_BASE_URL = `https://${process.env.AZURE_RESOURCE_NAME}.openai.azure.com/openai/deployments`;
const OPENAI_COMPATIBLE_API_BASE_URL =
  process.env.OPENAI_COMPATIBLE_API_BASE_URL || "";
const POLLINATIONS_API_BASE_URL =
  process.env.POLLINATIONS_API_BASE_URL ||
  "https://text.pollinations.ai/openai";
const OLLAMA_API_BASE_URL =
  process.env.OLLAMA_API_BASE_URL || "http://0.0.0.0:11434";
// Search provider API base url
const TAVILY_API_BASE_URL =
  process.env.TAVILY_API_BASE_URL || "https://api.tavily.com";
const FIRECRAWL_API_BASE_URL =
  process.env.FIRECRAWL_API_BASE_URL || "https://api.firecrawl.dev";
const EXA_API_BASE_URL = process.env.EXA_API_BASE_URL || "https://api.exa.ai";
const BOCHA_API_BASE_URL =
  process.env.BOCHA_API_BASE_URL || "https://api.bochaai.com";
const SEARXNG_API_BASE_URL =
  process.env.SEARXNG_API_BASE_URL || "http://0.0.0.0:8080";

export default async function Config(phase: string) {
  const nextConfig: NextConfig = {
    /* config options here */
    experimental: {
      reactCompiler: true,
    },
    env: {
      NEXT_PUBLIC_VERSION: pkg.version,
    },
    transpilePackages: ["pdfjs-dist", "mermaid"],
  };

  if (BUILD_MODE === "export") {
    nextConfig.output = "export";
    // Only used for static deployment, the default deployment directory is the root directory
    nextConfig.basePath = "";
    // Statically exporting a Next.js application via `next export` disables API routes and middleware.
    nextConfig.webpack = (config) => {
      config.module.rules.push({
        test: /src\/app\/api/,
        loader: "ignore-loader",
      });
      config.module.rules.push({
        test: /src\/middleware/,
        loader: "ignore-loader",
      });
      return config;
    };
  } else if (BUILD_MODE === "standalone") {
    nextConfig.output = "standalone";
  } else {
    nextConfig.rewrites = async () => {
      return [
        {
          source: "/api/ai/google/:path*",
          destination: `${
            GOOGLE_GENERATIVE_AI_API_BASE_URL || API_PROXY_BASE_URL
          }/:path*`,
        },
        {
          source: "/api/ai/openrouter/:path*",
          destination: `${OPENROUTER_API_BASE_URL}/:path*`,
        },
        {
          source: "/api/ai/openai/:path*",
          destination: `${OPENAI_API_BASE_URL}/:path*`,
        },
        {
          source: "/api/ai/anthropic/:path*",
          destination: `${ANTHROPIC_API_BASE_URL}/:path*`,
        },
        {
          source: "/api/ai/deepseek/:path*",
          destination: `${DEEPSEEK_API_BASE_URL}/:path*`,
        },
        {
          source: "/api/ai/xai/:path*",
          destination: `${XAI_API_BASE_URL}/:path*`,
        },
        {
          source: "/api/ai/mistral/:path*",
          destination: `${MISTRAL_API_BASE_URL}/:path*`,
        },
        {
          source: "/api/ai/azure/:path*",
          destination: `${AZURE_API_BASE_URL}/:path*`,
        },
        {
          source: "/api/ai/openaicompatible/:path*",
          destination: `${OPENAI_COMPATIBLE_API_BASE_URL}/:path*`,
        },
        {
          source: "/api/ai/pollinations/:path*",
          destination: `${POLLINATIONS_API_BASE_URL}/:path*`,
        },
        {
          source: "/api/ai/ollama/:path*",
          destination: `${OLLAMA_API_BASE_URL}/:path*`,
        },
        {
          source: "/api/search/tavily/:path*",
          destination: `${TAVILY_API_BASE_URL}/:path*`,
        },
        {
          source: "/api/search/firecrawl/:path*",
          destination: `${FIRECRAWL_API_BASE_URL}/:path*`,
        },
        {
          source: "/api/search/exa/:path*",
          destination: `${EXA_API_BASE_URL}/:path*`,
        },
        {
          source: "/api/search/bocha/:path*",
          destination: `${BOCHA_API_BASE_URL}/:path*`,
        },
        {
          source: "/api/search/searxng/:path*",
          destination: `${SEARXNG_API_BASE_URL}/:path*`,
        },
      ];
    };
  }

  if (phase === PHASE_PRODUCTION_BUILD) {
    const withSerwist = withSerwistInit({
      // Note: This is only an example. If you use Pages Router,
      // use something else that works, such as "service-worker/index.ts".
      swSrc: "src/app/sw.ts",
      swDest: "public/sw.js",
      register: false,
    });

    return withSerwist(nextConfig);
  }

  return nextConfig;
}