import { existsSync } from "node:fs";
import { resolve } from "node:path";
import cookie from "@fastify/cookie";
import cors from "@fastify/cors";
import helmet from "@fastify/helmet";
import jwt from "@fastify/jwt";
import fastifyMultipart from "@fastify/multipart";
import rateLimit from "@fastify/rate-limit";
import sensible from "@fastify/sensible";
import fastifyStatic from "@fastify/static";
import Fastify, { type FastifyInstance } from "fastify";
import { migrationsReady } from "./db/client.js";
import { getDataDir } from "./db/db-utils.js";
import { env } from "./plugins/env.js";
import { authRoutes } from "./routes/auth.js";
import { doseRoutes } from "./routes/doses.js";
import { exportRoutes } from "./routes/export.js";
import { healthRoutes } from "./routes/health.js";
import { medicationRoutes } from "./routes/medications.js";
import { oidcRoutes } from "./routes/oidc.js";
import { plannerRoutes } from "./routes/planner.js";
import { refillRoutes } from "./routes/refills.js";
import { reportRoutes } from "./routes/report.js";
import { settingsRoutes } from "./routes/settings.js";
import { shareRoutes } from "./routes/share.js";
import { startIntakeReminderScheduler } from "./services/intake-reminder-scheduler.js";
import { startReminderScheduler } from "./services/reminder-scheduler.js";

// Re-export utilities from server-config for external use
export {
	buildAppConfig,
	buildBaseCookieOptions,
	buildRefreshCookieOptions,
	ensureImagesDirectory,
	getJwtConfig,
	parseCorsOrigins,
} from "./utils/server-config.js";

import {
	buildAppConfig,
	buildBaseCookieOptions,
	buildRefreshCookieOptions,
	ensureImagesDirectory,
	getJwtConfig,
	parseCorsOrigins,
} from "./utils/server-config.js";

/** Create and configure Fastify app (without starting) */
export async function createApp(options?: {
	logLevel?: string;
	corsOrigins?: string[];
	authEnabled?: boolean;
	jwtSecret?: string;
	refreshSecret?: string;
	cookieSecret?: string;
	accessTtlMinutes?: number;
	refreshTtlDays?: number;
	isProduction?: boolean;
	imagesDir?: string;
}): Promise<FastifyInstance> {
	const opts = {
		logLevel: options?.logLevel ?? "info",
		corsOrigins: options?.corsOrigins ?? ["http://localhost:5173"],
		authEnabled: options?.authEnabled ?? false,
		jwtSecret: options?.jwtSecret,
		refreshSecret: options?.refreshSecret,
		cookieSecret: options?.cookieSecret ?? "dev-cookie-secret",
		accessTtlMinutes: options?.accessTtlMinutes ?? 15,
		refreshTtlDays: options?.refreshTtlDays ?? 7,
		isProduction: options?.isProduction ?? false,
		imagesDir: options?.imagesDir ?? resolve(getDataDir(), "images"),
	};

	const app = Fastify({
		logger: { level: opts.logLevel },
	});

	// Build config
	const appConfig = buildAppConfig({
		jwtSecret: opts.jwtSecret,
		refreshSecret: opts.refreshSecret,
		accessTtlMinutes: opts.accessTtlMinutes,
		refreshTtlDays: opts.refreshTtlDays,
		isProduction: opts.isProduction,
	});

	app.decorate("config", appConfig);

	// Register plugins
	await app.register(sensible);
	await app.register(helmet);
	await app.register(cors, { origin: opts.corsOrigins, credentials: true });
	await app.register(rateLimit, { max: 300, timeWindow: "1 minute" });
	await app.register(cookie, { secret: opts.cookieSecret });

	// JWT plugin
	const jwtConfig = getJwtConfig(opts.authEnabled, opts.jwtSecret);
	await app.register(jwt, jwtConfig);

	await app.register(fastifyMultipart, { limits: { fileSize: 10 * 1024 * 1024 } });

	// Only register static if directory exists
	if (existsSync(opts.imagesDir)) {
		await app.register(fastifyStatic, {
			root: opts.imagesDir,
			prefix: "/images/",
			decorateReply: false,
		});
	}

	// Register routes
	await app.register(healthRoutes);
	await app.register(authRoutes);
	await app.register(oidcRoutes);
	await app.register(medicationRoutes);
	await app.register(settingsRoutes);
	await app.register(plannerRoutes);
	await app.register(shareRoutes);
	await app.register(doseRoutes);
	await app.register(exportRoutes);
	await app.register(refillRoutes);
	await app.register(reportRoutes);

	return app;
}

// =============================================================================
// Server initialization (runs on import)
// =============================================================================

import { log } from "./utils/logger.js";

// Wait for database migrations before anything else
await migrationsReady;
log.info("[DB] Migrations complete, starting server...");

// Ensure images directory exists
const imagesDir = ensureImagesDirectory();

const app = Fastify({
	logger: {
		level: env.LOG_LEVEL,
	},
});

const origins = parseCorsOrigins(env.CORS_ORIGINS);

// Auth token TTLs (hardcoded - no need for user configuration)
const accessTtlMinutes = env.ACCESS_TOKEN_TTL_MINUTES; // Access token TTL
const refreshTtlDays = env.REFRESH_TOKEN_TTL_DAYS; // Refresh token TTL

const baseCookieOptions = buildBaseCookieOptions(accessTtlMinutes, env.NODE_ENV === "production");
const refreshCookieOptions = buildRefreshCookieOptions(baseCookieOptions, refreshTtlDays);

// Config decorator - only include secrets if auth is enabled
app.decorate("config", {
	accessSecret: env.JWT_SECRET ?? "",
	refreshSecret: env.REFRESH_SECRET ?? "",
	accessTtl: accessTtlMinutes,
	refreshTtl: refreshTtlDays,
	cookieOptions: baseCookieOptions,
	refreshCookieOptions,
});

await app.register(sensible);
await app.register(helmet);
await app.register(cors, { origin: origins, credentials: true });
await app.register(rateLimit, {
	max: Number(process.env.RATE_LIMIT_MAX) || 100,
	timeWindow: "1 minute",
});
await app.register(cookie, { secret: env.COOKIE_SECRET ?? "dev-cookie-secret" });

// JWT plugin - only register with valid secret if auth is enabled
const jwtConfig = getJwtConfig(env.AUTH_ENABLED, env.JWT_SECRET);
await app.register(jwt, jwtConfig);

await app.register(fastifyMultipart, { limits: { fileSize: 10 * 1024 * 1024 } }); // 10MB limit
await app.register(fastifyStatic, {
	root: imagesDir,
	prefix: "/images/",
	decorateReply: false,
});

await app.register(healthRoutes);
await app.register(authRoutes);
await app.register(oidcRoutes);
await app.register(medicationRoutes);
await app.register(settingsRoutes);
await app.register(plannerRoutes);
await app.register(shareRoutes);
await app.register(doseRoutes);
await app.register(exportRoutes);
await app.register(refillRoutes);
await app.register(reportRoutes);

const start = async () => {
	try {
		await app.listen({ port: env.PORT, host: "0.0.0.0" });
		app.log.info(`Server running on ${env.PORT}`);

		// Start the automatic reminder scheduler
		startReminderScheduler({
			info: (msg) => app.log.info(msg),
			debug: (msg) => app.log.debug(msg),
			error: (msg) => app.log.error(msg),
		});

		// Start the intake reminder scheduler (checks every minute)
		startIntakeReminderScheduler({
			info: (msg) => app.log.info(msg),
			debug: (msg) => app.log.debug(msg),
			error: (msg) => app.log.error(msg),
		});
	} catch (err) {
		app.log.error(err);
		process.exit(1);
	}
};

start();