package maker

import (
	"context"
	"encoding/json"
	"os"
	"path/filepath"

	"gitea.loveuer.com/yizhisec/pkg3/logger"
	"yizhisec.com/hsv2/forge/pkg/downloader"
	"yizhisec.com/hsv2/forge/pkg/model"
)

func (m *maker) Proxy(ctx context.Context) error {
	const (
		binURL     = "https://artifactory.yizhisec.com:443/artifactory/filestore/hsv2/bin/caddy"
		systemdSvc = `[Unit]
Description=YiZhiSec Caddy Reverse Proxy
After=network.target

[Service]
Type=simple
User=root
ExecStart=/usr/local/bin/caddy run --config /etc/caddy/caddy.json
StandardOutput=journal
StandardError=journal
Nice=-20
Restart=always
RestartSec=5

[Install]
WantedBy=multi-user.target`
	)

	location := filepath.Join(m.workdir, "dependency", "proxy")

	logger.Info("☑️ maker.Proxy: 开始构建 caddy 反向代理...")
	logger.Debug("☑️ maker.Proxy: 创建目录 %s", location)
	if err := os.MkdirAll(location, 0755); err != nil {
		logger.Debug("❌ maker.Proxy: 创建目录失败: %v", err)
		return err
	}
	logger.Debug("✅ maker.Proxy: 创建目录 %s 成功", location)

	logger.Debug("☑️ maker.Proxy: 下载 caddy 二进制..., url = %s, dest = %s", binURL, filepath.Join(location, "caddy"))
	if err := downloader.Download(
		ctx,
		binURL,
		filepath.Join(location, "caddy"),
		downloader.WithInsecureSkipVerify(),
		downloader.WithFileMode(0755),
	); err != nil {
		logger.Debug("❌ maker.Proxy: 下载 caddy 失败, url = %s, err = %v", binURL, err)
		return err
	}
	logger.Debug("✅ maker.Proxy: 下载 caddy 成功, url = %s", binURL)

	logger.Debug("☑️ maker.Proxy: 写入 caddy.json 文件..., dest = %s", filepath.Join(location, "caddy.json"))
	caddyConfig := model.CaddyConfig{
		"apps": &model.CaddyApp{
			Layer4: &model.CaddyLayer4{
				Servers: map[string]*model.CaddyServer{
					"proxy_8443": {
						Listen: []string{":8443"},
						Routes: []*model.CaddyRoute{
							{
								Handle: []*model.CaddyHandle{
									{
										Handler: "proxy",
										Upstreams: []*model.CaddyUpstream{
											{Dial: []string{"__ip_1__:32443"}},
											{Dial: []string{"__ip_2__:32443"}},
										},
										HealthChecks: &model.CaddyHealthCheck{
											Active: &model.CaddyActive{
												Interval: "10s",
												Timeout:  "2s",
												Port:     32443,
											},
											Passive: &model.CaddyPassive{
												FailDuration: "30s",
												MaxFails:     2,
											},
										},
										LoadBalancing: &model.CaddyLoadBalancing{
											Selection: &model.CaddySelection{
												Policy: "round_robin",
											},
										},
									},
								},
							},
						},
					},
					"proxy_443": {
						Listen: []string{":443"},
						Routes: []*model.CaddyRoute{
							{
								Handle: []*model.CaddyHandle{
									{
										Handler: "proxy",
										Upstreams: []*model.CaddyUpstream{
											{Dial: []string{"__ip_1__:31443"}},
											{Dial: []string{"__ip_2__:31443"}},
										},
										HealthChecks: &model.CaddyHealthCheck{
											Active: &model.CaddyActive{
												Interval: "10s",
												Timeout:  "2s",
												Port:     31443,
											},
											Passive: &model.CaddyPassive{
												FailDuration: "30s",
												MaxFails:     2,
											},
										},
										LoadBalancing: &model.CaddyLoadBalancing{
											Selection: &model.CaddySelection{
												Policy: "round_robin",
											},
										},
									},
								},
							},
						},
					},
				},
			},
		},
	}
	bs, _ := json.MarshalIndent(caddyConfig, "", "  ")
	if err := os.WriteFile(filepath.Join(location, "caddy.json"), []byte(bs), 0644); err != nil {
		logger.Debug("❌ maker.Proxy: 写入 Caddyfile 失败, dest = %s, err = %v", filepath.Join(location, "caddy.json"), err)
		return err
	}
	logger.Debug("✅ maker.Proxy: 写入 Caddyfile 文件成功, dest = %s", filepath.Join(location, "caddy.json"))

	logger.Debug("☑️ maker.Proxy: 写入 caddy.service 文件..., dest = %s", filepath.Join(location, "caddy.service"))
	if err := os.WriteFile(filepath.Join(location, "caddy.service"), []byte(systemdSvc), 0644); err != nil {
		logger.Debug("❌ maker.Proxy: 写入 caddy.service 失败, dest = %s, err = %v", filepath.Join(location, "caddy.service"), err)
		return err
	}
	logger.Debug("✅ maker.Proxy: 写入 caddy.service 文件成功, dest = %s", filepath.Join(location, "caddy.service"))

	logger.Info("✅ maker.Proxy: 构建 caddy 反向代理成功!!!")
	return nil
}