import Fastify, { FastifyError } from "fastify";
import cookie from "@fastify/cookie";
import cors from "@fastify/cors";
import rateLimit from "@fastify/rate-limit";
import fastifyStatic from "@fastify/static";
import multipart from "@fastify/multipart";
import { resolve } from "node:path";
import { existsSync } from "node:fs";
import { createHmac } from "node:crypto";

import { config } from "./config.js";
import prisma from "./lib/prisma.js";
import securityPlugin from "./middleware/security.js";
import authPlugin from "./middleware/auth.js";
import { loadPlugins, startupPlugins, shutdownPlugins, getActivePluginInfo, getPluginAdminRoutes } from "./plugins/loader.js";
import { setLogger, initDynamicPlugins, shutdownDynamicPlugins, getDynamicPluginInfo, getDynamicPluginAdminRoutes } from "./plugins/registry.js";
import { seedAllBoardTemplates } from "./lib/default-templates.js";

import boardRoutes from "./routes/boards.js";
import postRoutes from "./routes/posts.js";
import voteRoutes from "./routes/votes.js";
import commentRoutes from "./routes/comments.js";
import reactionRoutes from "./routes/reactions.js";
import identityRoutes from "./routes/identity.js";
import passkeyRoutes from "./routes/passkey.js";
import feedRoutes from "./routes/feed.js";
import activityRoutes from "./routes/activity.js";
import pushRoutes from "./routes/push.js";
import privacyRoutes from "./routes/privacy.js";
import adminAuthRoutes from "./routes/admin/auth.js";
import adminPostRoutes from "./routes/admin/posts.js";
import adminBoardRoutes from "./routes/admin/boards.js";
import adminCategoryRoutes from "./routes/admin/categories.js";
import adminStatsRoutes from "./routes/admin/stats.js";
import searchRoutes from "./routes/search.js";
import roadmapRoutes from "./routes/roadmap.js";
import similarRoutes from "./routes/similar.js";
import adminTagRoutes from "./routes/admin/tags.js";
import adminNoteRoutes from "./routes/admin/notes.js";
import adminChangelogRoutes from "./routes/admin/changelog.js";
import adminWebhookRoutes from "./routes/admin/webhooks.js";
import changelogRoutes from "./routes/changelog.js";
import notificationRoutes from "./routes/notifications.js";
import embedRoutes from "./routes/embed.js";
import adminStatusRoutes from "./routes/admin/statuses.js";
import adminExportRoutes from "./routes/admin/export.js";
import adminTemplateRoutes from "./routes/admin/templates.js";
import templateRoutes from "./routes/templates.js";
import attachmentRoutes from "./routes/attachments.js";
import avatarRoutes from "./routes/avatars.js";
import recoveryRoutes from "./routes/recovery.js";
import settingsRoutes from "./routes/admin/settings.js";
import adminTeamRoutes from "./routes/admin/team.js";
import adminPluginRoutes from "./routes/admin/plugins.js";
import pluginApiRoutes from "./routes/plugins-api.js";

export async function createServer() {
  const app = Fastify({
    logger: {
      serializers: {
        req(req) {
          return {
            method: req.method,
            url: req.url,
            remoteAddress: req.ip,
          };
        },
      },
    },
  });

  const cookieSecret = createHmac("sha256", config.TOKEN_SECRET).update("echoboard:cookie").digest("hex");
  await app.register(cookie, { secret: cookieSecret });
  await app.register(cors, {
    origin: process.env.NODE_ENV === "production"
      ? config.WEBAUTHN_ORIGIN
      : ["http://localhost:3000", "http://localhost:5173", "http://127.0.0.1:3000", "http://127.0.0.1:5173"],
    credentials: true,
  });

  const allowedOrigins = new Set(
    process.env.NODE_ENV === "production"
      ? [config.WEBAUTHN_ORIGIN]
      : [config.WEBAUTHN_ORIGIN, "http://localhost:3000", "http://localhost:5173", "http://127.0.0.1:3000", "http://127.0.0.1:5173"]
  );
  app.addHook("onRequest", async (req, reply) => {
    if (["POST", "PUT", "PATCH", "DELETE"].includes(req.method)) {
      const origin = req.headers.origin;
      // Server-to-server webhook calls don't send Origin headers
      if (!origin && req.url.startsWith('/api/v1/plugins/') && req.url.includes('/webhook')) return;
      if (!origin || !allowedOrigins.has(origin)) {
        return reply.status(403).send({ error: "Forbidden" });
      }
    }
  });

  await app.register(multipart, { limits: { fileSize: 5 * 1024 * 1024 } });
  await app.register(rateLimit, {
    max: 100,
    timeWindow: "1 minute",
  });

  app.setErrorHandler((error: FastifyError, req, reply) => {
    req.log.error(error);

    // zod validation errors
    if (error.validation) {
      reply.status(400).send({ error: "Validation failed" });
      return;
    }

    // fastify rate limit
    if (error.statusCode === 429) {
      reply.status(429).send({ error: "Too many requests" });
      return;
    }

    const status = error.statusCode ?? 500;
    reply.status(status).send({
      error: status >= 500 ? "Internal server error" : error.message,
    });
  });

  await app.register(securityPlugin);
  await app.register(authPlugin);

  app.decorate("prisma", prisma);

  // api routes under /api/v1
  await app.register(async (api) => {
    await api.register(boardRoutes);
    await api.register(postRoutes);
    await api.register(voteRoutes);
    await api.register(commentRoutes);
    await api.register(reactionRoutes);
    await api.register(identityRoutes);
    await api.register(passkeyRoutes);
    await api.register(feedRoutes);
    await api.register(activityRoutes);
    await api.register(pushRoutes);
    await api.register(privacyRoutes);
    await api.register(adminAuthRoutes);
    await api.register(adminPostRoutes);
    await api.register(adminBoardRoutes);
    await api.register(adminCategoryRoutes);
    await api.register(adminStatsRoutes);
    await api.register(searchRoutes);
    await api.register(roadmapRoutes);
    await api.register(similarRoutes);
    await api.register(adminTagRoutes);
    await api.register(adminNoteRoutes);
    await api.register(adminChangelogRoutes);
    await api.register(adminWebhookRoutes);
    await api.register(changelogRoutes);
    await api.register(notificationRoutes);
    await api.register(embedRoutes);
    await api.register(adminStatusRoutes);
    await api.register(adminExportRoutes);
    await api.register(adminTemplateRoutes);
    await api.register(templateRoutes);
    await api.register(attachmentRoutes);
    await api.register(avatarRoutes);
    await api.register(recoveryRoutes);
    await api.register(settingsRoutes);
    await api.register(adminTeamRoutes);
    await api.register(adminPluginRoutes);
    await api.register(pluginApiRoutes);
  }, { prefix: "/api/v1" });

  // serve static frontend build in production
  const webDist = resolve(process.cwd(), "../web/dist");
  if (process.env.NODE_ENV === "production" && existsSync(webDist)) {
    await app.register(fastifyStatic, {
      root: webDist,
      wildcard: false,
    });

    app.setNotFoundHandler((_req, reply) => {
      reply.sendFile("index.html");
    });
  }

  await loadPlugins(app);
  await startupPlugins();
  setLogger(app.log);
  await initDynamicPlugins();

  // seed default templates for boards that have none
  await seedAllBoardTemplates(prisma);

  // register plugin discovery endpoint and admin routes
  await app.register(async (api) => {
    api.get("/plugins/active", {
      config: { rateLimit: { max: 30, timeWindow: "1 minute" } },
    }, async () => [...getActivePluginInfo(), ...getDynamicPluginInfo()]);

    // register plugin-provided admin routes
    for (const route of getPluginAdminRoutes()) {
      api.get(`/plugins${route.path}`, { preHandler: [app.requireAdmin] }, async () => ({
        label: route.label,
        component: route.component,
      }));
    }

    // register dynamic plugin admin routes
    for (const route of getDynamicPluginAdminRoutes()) {
      api.get(`/plugins${route.path}`, { preHandler: [app.requireAdmin] }, async () => ({
        label: route.label,
      }));
    }
  }, { prefix: "/api/v1" });

  app.addHook("onClose", async () => {
    await shutdownPlugins();
    await shutdownDynamicPlugins();
  });

  return app;
}