package cmdline

import (
	"context"
	"database/sql"
	"encoding/json"
	"fmt"
	"os"
	"path"
	"path/filepath"
	"strings"
	"time"

	"github.com/chzyer/readline"
	"github.com/spf13/cobra"
	"gitlink.org.cn/cloudream/common/pkgs/logger"
	"gitlink.org.cn/cloudream/jcs-pub/client/internal/accesstoken"
	clicfg "gitlink.org.cn/cloudream/jcs-pub/client/internal/config"
	"gitlink.org.cn/cloudream/jcs-pub/client/internal/db"
	"gitlink.org.cn/cloudream/jcs-pub/client/internal/downloader"
	"gitlink.org.cn/cloudream/jcs-pub/client/internal/http"
	mntcfg "gitlink.org.cn/cloudream/jcs-pub/client/internal/mount/config"
	"gitlink.org.cn/cloudream/jcs-pub/client/internal/ticktock"
	corrpc "gitlink.org.cn/cloudream/jcs-pub/common/pkgs/rpc/coordinator"
	hubrpc "gitlink.org.cn/cloudream/jcs-pub/common/pkgs/rpc/hub"
	"gitlink.org.cn/cloudream/jcs-pub/common/pkgs/sysevent"
)

var confs_file = path.Join("confs", "client.config.json")
var cli_certs_path = path.Join("confs", "cli_certs")
var pub_certs_path = path.Join("confs", "pub_certs")
var ca_key_file = "ca_key.pem"
var ca_cert_file = "ca_cert.pem"
var client_cert_file = "client_cert.pem"
var client_key_file = "client_key.pem"

func init() {
	cmd := cobra.Command{
		Use:   "init",
		Short: "initialize client configuration",
		Run: func(c *cobra.Command, args []string) {
			init2()
		},
	}
	RootCmd.AddCommand(&cmd)
}

func getPath() (exePath string, dirPath string, err error) {
	exePath, err = os.Executable()
	if err != nil {
		return "", "", fmt.Errorf("获取执行路径失败: %w", err)
	}
	dirPath = filepath.Dir(exePath)
	return exePath, dirPath, nil
}

func init2() error {
	rl, err := readline.New("> ")
	if err != nil {
		fmt.Printf("初始化命令行失败: %v\n", err)
		return err
	}
	defer rl.Close()

	// 1. 检查配置文件是否存在
	_, dirPath, err := getPath()
	if err != nil {
		return err
	}

	configFilePath := filepath.Join(dirPath, confs_file)
	cliCertsPath := filepath.Join(dirPath, cli_certs_path)
	pubCertsPath := filepath.Join(dirPath, pub_certs_path)

	_, err = os.Stat(configFilePath)
	if err == nil {
		fmt.Println("\033[33m━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━\033[0m")
		fmt.Println("\033[33m⚠ 配置文件已存在！重新初始化会覆盖原配置文件\033[0m")
		fmt.Println("\033[33m━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━\033[0m")
	checkLoop:
		for {
			// 2. 配置文件存在，询问是否覆盖
			rl.SetPrompt("\033[36m是否继续?(y/n): \033[0m")
			overwrite, err := rl.Readline()
			if err != nil {
				return err
			}

			switch strings.ToLower(strings.TrimSpace(overwrite)) {
			case "y", "yes":
				break checkLoop

			case "n", "no":
				fmt.Printf("\033[32m已保留原有配置文件，退出初始化\033[0m\n")
				return nil

			default:
				fmt.Println("\033[31m无效输入！请输入 y/n 或 yes/no \033[0m")
			}
		}
	}

	var cfg clicfg.Config

mysqlLoop:
	for {
		// 3. 询问数据库配置
		rl.SetPrompt("\033[36m请输入Mysql连接地址(例如127.0.0.1:3306): \033[0m")
		dbAddress, err := rl.Readline()
		if err != nil {
			return err
		}

		rl.SetPrompt("\033[36m请输入Mysql用户名(例如root): \033[0m")
		dbAccount, err := rl.Readline()
		if err != nil {
			return err
		}

		dbPasswordBytes, err := rl.ReadPassword("\033[36m请输入Mysql密码(例如123456): \033[0m")
		if err != nil {
			return err
		}
		dbPassword := string(dbPasswordBytes)

		rl.SetPrompt("\033[36m请输入Mysql数据库名称(例如cloudream): \033[0m")
		dbName, err := rl.Readline()
		if err != nil {
			return err
		}

		cfg.DB = db.Config{
			Address:      dbAddress,
			Account:      dbAccount,
			Password:     dbPassword,
			DatabaseName: dbName,
		}

		rl.SetPrompt("\033[36m是否测试数据库连接？(y/n): \033[0m")
		needTest, err := rl.Readline()
		if err != nil {
			return err
		}

		switch strings.ToLower(strings.TrimSpace(needTest)) {
		case "y", "yes":
			// 4. 测试数据库连接
			fmt.Printf("\033[33m正在测试数据库连接...\033[0m\n")
			testDB, err := sql.Open("mysql", fmt.Sprintf("%s:%s@tcp(%s)/%s",
				dbAccount,
				dbPassword,
				dbAddress,
				dbName))
			if err != nil {
				fmt.Printf("\033[31m连接创建失败: %v\033[0m\n", err)
				testDB.Close()
			} else {
				ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
				defer cancel()

				err = testDB.PingContext(ctx)
				if err != nil {
					fmt.Printf("\033[31m数据库连接测试失败: %v\033[0m\n", err)
					testDB.Close()
				} else {
					fmt.Printf("\033[32m✓ 数据库连接测试成功!\033[0m\n\n")
					testDB.Close()
					break mysqlLoop
				}
			}

			rl.SetPrompt("\033[36m连接测试失败，是否重新输入配置?(y/n): \033[0m")
			retry, err := rl.Readline()
			if err != nil {
				return err
			}

			if strings.ToLower(retry) != "y" {
				fmt.Printf("\033[33m警告: 数据库连接尚未验证，将使用当前配置，如需后续更改，请查看配置文件client.config.json\033[0m\n")
				break mysqlLoop
			}

		case "n", "no":
			fmt.Printf("\033[33m警告: 数据库连接未测试，将直接使用当前配置，如需后续更改，请查看配置文件client.config.json\033[0m\n")
			break mysqlLoop

		default:
			fmt.Println("\033[31m无效输入！请输入 y/n 或 yes/no \033[0m")
		}
	}

	// 5. 询问证书配置
	rl.SetPrompt("\033[36m请输入HTTP API监听地址(例如127.0.0.1:3306): \033[0m")
	listen, err := rl.Readline()
	if err != nil {
		return err
	}

	// 6. 生成证书
	err = os.MkdirAll(cliCertsPath, 0755)
	if err != nil {
		return err
	}

	keyFilePath := filepath.Join(cliCertsPath, ca_key_file)
	certFilePath := filepath.Join(cliCertsPath, ca_cert_file)
	certRoot(cliCertsPath)
	certServer(certFilePath, keyFilePath, cliCertsPath)
	certClient(certFilePath, keyFilePath, cliCertsPath)

	cfg.HTTP = &http.ConfigJSON{
		Enabled:     true,
		Listen:      listen,
		UserSpaceID: 0,
		RootCA:      path.Join(cli_certs_path, "ca_cert.pem"),
		ServerCert:  path.Join(cli_certs_path, "server_cert.pem"),
		ServerKey:   path.Join(cli_certs_path, "server_key.pem"),
		ClientCerts: []string{path.Join(cli_certs_path, "client_cert.pem")},
		MaxBodySize: 5242880,
	}

cloudLoop:
	for {
		// 7. 填写云际基础设施配置
		rl.SetPrompt("\033[36m是否连接云际存储基础设施？(y/n): \033[0m")
		isConnect, err := rl.Readline()
		if err != nil {
			return err
		}

		switch strings.ToLower(strings.TrimSpace(isConnect)) {
		case "y", "yes":
			rl.SetPrompt("\033[36m请输入Coordinator地址: \033[0m")
			coorAddress, err := rl.Readline()
			if err != nil {
				return err
			}

			cfg.CoordinatorRPC = corrpc.PoolConfigJSON{
				Address:    coorAddress,
				RootCA:     path.Join(".", pub_certs_path, ca_cert_file),
				ClientCert: path.Join(".", pub_certs_path, client_cert_file),
				ClientKey:  path.Join(".", pub_certs_path, client_key_file),
			}

			cfg.HubRPC = hubrpc.PoolConfigJSON{
				RootCA:     path.Join(".", pub_certs_path, ca_cert_file),
				ClientCert: path.Join(".", pub_certs_path, client_cert_file),
				ClientKey:  path.Join(".", pub_certs_path, client_key_file),
			}

			rl.SetPrompt("\033[36m请输入账户名(Account): \033[0m")
			account, err := rl.Readline()
			if err != nil {
				return err
			}

			passwordBytes, err := rl.ReadPassword("\033[36m请输入密码(Password): \033[0m")
			if err != nil {
				return err
			}
			password := string(passwordBytes)

			cfg.AccessToken = &accesstoken.Config{
				Account:  account,
				Password: password,
			}

			fmt.Printf("\033[33m注意：请将JCS-pub证书文件放置于 %s 目录下\033[0m\n", pubCertsPath)
			err = os.MkdirAll(pubCertsPath, 0755)
			if err != nil {
				return err
			}
			break cloudLoop

		case "n", "no":
			cfg.CoordinatorRPC.Address = "127.0.0.1:5009"
			cfg.AccessToken = &accesstoken.Config{}
			break cloudLoop

		default:
			fmt.Println("\033[31m无效输入！请输入 y/n 或 yes/no \033[0m")
		}
	}

	// 8. 生成配置文件
	err = saveConfig(&cfg, configFilePath)
	if err != nil {
		fmt.Printf("\033[31m保存配置文件失败: %v\033[0m\n", err)
		return err
	}
	fmt.Printf("\033[32m配置文件已生成: %s\033[0m\n", configFilePath)

dbLoop:
	for {
		// 9. 询问是否生成库表结构
		rl.SetPrompt("\033[36m是否生成数据库表？(y/n): \033[0m")
		isCreate, err := rl.Readline()
		if err != nil {
			return err
		}

		switch strings.ToLower(strings.TrimSpace(isCreate)) {
		case "y", "yes":
			// 10. 创建库表结构
			migrate(configFilePath)
			break dbLoop

		case "n", "no":
			fmt.Println("\033[33m请自行创建数据库表，如需更改配置，请查看配置文件client.config.json \033[0m")
			break dbLoop

		default:
			fmt.Println("\033[31m无效输入！请输入 y/n 或 yes/no \033[0m")
		}
	}
	return nil
}

func saveConfig(cfg *clicfg.Config, configPath string) error {
	cfg.Logger = logger.Config{
		Level:           "info",
		Output:          "file",
		OutputFileName:  "client.log",
		OutputDirectory: path.Join(".", "logs"),
	}
	cfg.SysEvent = sysevent.Config{
		Enabled:  false,
		Address:  "127.0.0.1:5672",
		Account:  "cloudream",
		Password: "123456",
		VHost:    "/",
		Exchange: "SysEvent",
		Queue:    "SysEvent",
	}
	cfg.Connectivity.TestInterval = 300
	cfg.Downloader = downloader.Config{
		MaxStripCacheCount:   100,
		ECStripPrefetchCount: 1,
	}
	cfg.DownloadStrategy.HighLatencyHubMs = 35
	cfg.TickTock = ticktock.Config{
		ECFileSizeThreshold:     5242880,
		AccessStatHistoryWeight: 0.8,
	}
	cfg.Mount = &mntcfg.Config{
		Enabled:             false,
		AttrTimeout:         time.Second * 10,
		UploadPendingTime:   time.Second * 30,
		CacheActiveTime:     time.Minute * 1,
		CacheExpireTime:     time.Minute * 1,
		ScanDataDirInterval: time.Minute * 10,
	}

	configData, err := json.MarshalIndent(cfg, "", "    ")
	if err != nil {
		return fmt.Errorf("序列化配置失败: %w", err)
	}

	configData = append(configData, '\n')

	err = os.WriteFile(configPath, configData, 0644)
	if err != nil {
		return fmt.Errorf("写入配置文件失败: %w", err)
	}
	return nil
}