package main

import (
	"fmt"

	"charm.land/huh/v2"
)

var encryptionOptions = []huh.Option[string]{
	huh.NewOption("STARTTLS", "starttls"),
	huh.NewOption("SSL/TLS", "ssl"),
	huh.NewOption("None", "none"),
}

func getEncryptionFromOption(option string) string {
	switch option {
	case "ssl":
		return "ssl"
	case "none":
		return "none"
	default:
		return "starttls"
	}
}

func runOnboarding() error {
	var accountName string
	var email string
	var provider string
	var smtpHost string
	var smtpPort string
	var imapHost string
	var imapPort string
	var smtpUsername string
	var smtpPassword string
	var smtpEncryption string
	var smtpInsecure bool
	var unsafeHTML bool

	form := huh.NewForm(
		huh.NewGroup(
			huh.NewNote().
				Title("欢迎使用 Pop").
				Description("让我们先配置一下邮件账户。"),
		),
		huh.NewGroup(
			huh.NewInput().
				Title("邮箱地址").
				Value(&email),
			huh.NewInput().
				Title("账户名称 (可选)").
				Value(&accountName),
		),
	)

	err := form.Run()
	if err != nil {
		return err
	}

	provider = getProviderName(email)
	hasDefaults := false
	if defaults, ok := providerDefaults[provider]; ok {
		hasDefaults = true
		smtpHost = defaults.SMTPHost
		smtpPort = fmt.Sprintf("%d", defaults.SMTPPort)
		imapHost = defaults.IMAPHost
		imapPort = fmt.Sprintf("%d", defaults.IMAPPort)
		smtpEncryption = defaults.SMTPEncryption
	}

	if !hasDefaults {
		provider = "custom"
	}

	var form2 *huh.Form
	if hasDefaults {
		form2 = huh.NewForm(
			huh.NewGroup(
				huh.NewNote().
					Title("已识别: "+provider).
					Description(fmt.Sprintf("SMTP: %s:%s | IMAP: %s:%s", smtpHost, smtpPort, imapHost, imapPort)),
			),
			huh.NewGroup(
				huh.NewConfirm().
					Title("使用默认配置?").
					Affirmative("是").
					Negative("否, 手动配置").
					Value(&hasDefaults),
			),
		)
	} else {
		form2 = huh.NewForm(
			huh.NewGroup(
				huh.NewNote().
					Title("未知邮箱服务商").
					Description("请手动配置服务器地址。"),
			),
			huh.NewGroup(
				huh.NewInput().
					Title("IMAP 服务器").
					Value(&imapHost),
				huh.NewInput().
					Title("IMAP 端口").
					Value(&imapPort),
			),
			huh.NewGroup(
				huh.NewInput().
					Title("SMTP 服务器").
					Value(&smtpHost),
				huh.NewInput().
					Title("SMTP 端口").
					Value(&smtpPort),
				huh.NewSelect[string]().
					Title("加密方式").
					Options(encryptionOptions...).
					Value(&smtpEncryption),
			),
		)
	}

	err = form2.Run()
	if err != nil {
		return err
	}

	form3 := huh.NewForm(
		huh.NewGroup(
			huh.NewInput().
				Title("用户名").
				Value(&smtpUsername),
			huh.NewInput().
				Title("密码/授权码").
				Password(true).
				Value(&smtpPassword),
		),
		huh.NewGroup(
			huh.NewConfirm().
				Title("跳过 TLS 验证?").
				Affirmative("是").
				Negative("否").
				Value(&smtpInsecure),
		),
		huh.NewGroup(
			huh.NewConfirm().
				Title("启用 unsafe HTML?").
				Affirmative("是").
				Negative("否").
				Value(&unsafeHTML),
		),
	)

	err = form3.Run()
	if err != nil {
		return err
	}

	cfg := Config{
		From:       email,
		Signature:  "",
		UnsafeHTML: unsafeHTML,
		Accounts: []Account{
			{
				Name:           accountName,
				Email:          email,
				Provider:       provider,
				Username:       smtpUsername,
				Password:       smtpPassword,
				SMTPEncryption: smtpEncryption,
				IMAP: IMAPConfig{
					Host:     imapHost,
					Password: smtpPassword,
				},
				SMTP: SMTPConfig{
					Host:               smtpHost,
					Username:           smtpUsername,
					Password:           smtpPassword,
					InsecureSkipVerify: smtpInsecure,
				},
			},
		},
	}

	if imapPort != "" {
		fmt.Sscanf(imapPort, "%d", &cfg.Accounts[0].IMAP.Port)
	}
	if smtpPort != "" {
		fmt.Sscanf(smtpPort, "%d", &cfg.Accounts[0].SMTP.Port)
	}
	if smtpEncryption == "" {
		cfg.Accounts[0].SMTP.Encryption = "starttls"
	} else {
		cfg.Accounts[0].SMTP.Encryption = getEncryptionFromOption(smtpEncryption)
	}

	if cfg.Accounts[0].Name == "" {
		cfg.Accounts[0].Name = provider
	}

	return saveConfig(cfg)
}