package contactusser

import (
	"context"
	"net/mail"
	"strings"
	"time"
	"unicode/utf8"
	"videoweb/app/api/proto"
	"videoweb/pub/common/srvdef"
	"videoweb/pub/models/contactusmod"
)

const (
	contactUsMaxEmailLen      = 100
	contactUsMaxTitleLen      = 100
	contactUsMaxContentLen    = 1000
	contactUsMaxAttachmentNum = 9
	contactUsSubmitMessage    = "提交成功，我们会在24小时内回复。"
)

const (
	ContactUsTypeOrder   int32 = 1 // 订单问题
	ContactUsTypeAccount int32 = 2 // 账号问题
	ContactUsTypeFeature int32 = 3 // 功能问题
	ContactUsTypeExp     int32 = 4 // 体验问题
	ContactUsTypeOther   int32 = 5 // 其他
)

// AddContactUs 提交联系我们记录
func AddContactUs(ctx context.Context, userId int64, req *proto.ContactUsAddReq) (*proto.ContactUsAddResp, *srvdef.SrvErr) {
	if req == nil || userId <= 0 {
		return nil, srvdef.New(srvdef.ErrParamError, "", "")
	}
	email := strings.TrimSpace(req.Email)
	if !isValidEmail(email) || utf8.RuneCountInString(email) > contactUsMaxEmailLen {
		return nil, srvdef.New(srvdef.ErrParamError, "邮箱格式错误")
	}
	if !isValidContactUsType(req.Type) {
		return nil, srvdef.New(srvdef.ErrParamError, "问题类型无效")
	}
	title := strings.TrimSpace(req.Title)
	if title == "" || utf8.RuneCountInString(title) > contactUsMaxTitleLen {
		return nil, srvdef.New(srvdef.ErrParamError, "标题不能为空且不能超过100字")
	}
	content := strings.TrimSpace(req.Content)
	if content == "" || utf8.RuneCountInString(content) > contactUsMaxContentLen {
		return nil, srvdef.New(srvdef.ErrParamError, "内容不能为空且不能超过1000字")
	}
	attachments := normalizeAttachments(req.Attachments)
	if len(attachments) > contactUsMaxAttachmentNum {
		return nil, srvdef.New(srvdef.ErrParamError, "附件不能超过9个")
	}
	now := time.Now()
	doc := &contactusmod.ContactUs{
		UserId:       userId,
		Email:        email,
		QuestionType: req.Type,
		Title:        title,
		Content:      content,
		Attachments:  attachments,
		Status:       0,
		CreatedAt:    now,
		UpdatedAt:    now,
	}
	if err := contactusmod.InsertOneContactUs(ctx, doc); err != nil {
		return nil, err
	}
	return &proto.ContactUsAddResp{Message: contactUsSubmitMessage}, nil
}

func isValidEmail(email string) bool {
	if email == "" {
		return false
	}
	_, err := mail.ParseAddress(email)
	return err == nil
}

func isValidContactUsType(questionType int32) bool {
	return questionType >= ContactUsTypeOrder && questionType <= ContactUsTypeOther
}

func normalizeAttachments(rawAttachments []string) []string {
	attachments := make([]string, 0, len(rawAttachments))
	for _, attachment := range rawAttachments {
		attachment = strings.TrimSpace(attachment)
		if attachment != "" {
			attachments = append(attachments, attachment)
		}
	}
	return attachments
}