// Copyright 2022 E99p1ant. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.

package cmd

import (
	"fmt"
	"net/http"
	"time"

	"github.com/pkg/errors"
	"github.com/sirupsen/logrus"
	"github.com/uptrace/opentelemetry-go-extra/otellogrus"
	"github.com/uptrace/uptrace-go/uptrace"
	"github.com/urfave/cli/v2"

	"github.com/tamakyi/TamaBox/internal/conf"
	"github.com/tamakyi/TamaBox/internal/db"
	"github.com/tamakyi/TamaBox/internal/route"
	"github.com/tamakyi/TamaBox/internal/shared"
	"github.com/tamakyi/TamaBox/internal/tracing"
)

var Web = &cli.Command{
	Name:   "web",
	Usage:  "Start web server",
	Action: runWeb,
}

func runWeb(ctx *cli.Context) error {
	if err := conf.Init(); err != nil {
		return errors.Wrap(err, "load configuration")
	}

	// 解析可信代理网段（用于客户端 IP 解析，避免维护 Cloudflare 庞大 CIDR 清单）。
	if err := shared.InitTrustedProxies(); err != nil {
		return errors.Wrap(err, "init trusted proxies")
	}

	if conf.App.UptraceDSN != "" {
		uptrace.ConfigureOpentelemetry(
			uptrace.WithDSN(conf.App.UptraceDSN),
			uptrace.WithServiceName("tamabox"),
			uptrace.WithServiceVersion(conf.BuildCommit),
		)
		logrus.WithContext(ctx.Context).Debug("Tracing enabled.")
	}

	logrus.AddHook(otellogrus.NewHook(otellogrus.WithLevels(
		logrus.PanicLevel,
		logrus.FatalLevel,
		logrus.ErrorLevel,
		logrus.WarnLevel,
	)))

	dbType := conf.Database.Type

	var dsn string
	switch dbType {
	case "mysql", "":
		dsn = conf.MySQLDsn()
	case "postgres":
		dsn = conf.PostgresDsn()
	default:
		return errors.Errorf("unknown database type: %q", dbType)
	}
	conf.Database.DSN = dsn

	_, err := db.Init(dbType, dsn)
	if err != nil {
		return errors.Wrap(err, "connect to database")
	}

	// 蜜罐命中记录保留期清理：honeypot_hits 是只追加的审计表，写入完全由
	// 外部扫描流量驱动（不可预期、不可节流）。没有自动清理的话，表体积只增不减。
	// 保留期复用 honeypot_retain_days（与 CLI prune 同一个口径），开关为 honeypot_auto_clean。
	stopRetention := make(chan struct{})
	if conf.Security.HoneypotAutoClean {
		db.NewHoneypotRetention(db.Honeypots, conf.Security.HoneypotRetainDays, conf.Security.HoneypotMaxRows, 0).Start(stopRetention)
		defer close(stopRetention)
	}

	logrus.WithContext(ctx.Context).WithField("external_url", conf.App.ExternalURL).Info("Starting web server")

	// 站点默认语言初始化（default_lang 配置，未配置时回退 zh-CN）
	shared.App.SetLang(conf.App.DefaultLang)

	r := route.New()
	r.Use(tracing.Middleware("TamaBox"))

	// 最外层挂载 gzip 压缩，并在 http.Server 上配置超时：
	// - ReadHeaderTimeout 防止慢速客户端占用连接
	// - ReadTimeout / WriteTimeout 防止读写挂死
	// - IdleTimeout 复用 keep-alive 连接
	// listen 留空时回退到 ":port"（监听所有网卡）；Cloudflare Tunnel 部署建议设为
	// "127.0.0.1:<port>"，使源站端口仅对本地 cloudflared 可见，即使防火墙误配也无法被外部直连。
	addr := conf.Server.Listen
	if addr == "" {
		addr = fmt.Sprintf(":%d", conf.Server.Port)
	}
	server := &http.Server{
		Addr:              addr,
		Handler:           route.GzipHandler(r),
		ReadHeaderTimeout: 10 * time.Second,
		ReadTimeout:       30 * time.Second,
		WriteTimeout:      60 * time.Second,
		IdleTimeout:       120 * time.Second,
	}

	logrus.WithContext(ctx.Context).WithField("port", conf.Server.Port).Info("Listening on")
	if err := server.ListenAndServe(); err != nil && err != http.ErrServerClosed {
		return errors.Wrap(err, "start http server")
	}
	return nil
}