// 功能描述：用户地址列表及本人客服工单创建、查询、确认和取消。
// 版本：1.1.0。
package user

import (
	"errors"
	"strings"
	"time"

	"git.apinb.com/bsm-sdk/core/errcode"
	"git.apinb.com/bsm-sdk/core/infra"
	"git.apinb.com/heqiapp/platforms/backend/api/internal/impl"
	common "git.apinb.com/heqiapp/platforms/backend/api/internal/logic/common"
	"git.apinb.com/heqiapp/platforms/backend/api/internal/models"
	"github.com/gin-gonic/gin"
	"gorm.io/gorm"
	"gorm.io/gorm/clause"
)

// ListAddresses 返回当前用户未归档地址。
func ListAddresses(ctx *gin.Context) {
	account, ok := common.UserAccount(ctx)
	if !ok {
		return
	}
	var list []models.UserAddress
	if err := impl.DBService.Where("user_account_id = ? AND status <> ?", account.ID, common.StatusArchived).Order("is_default desc, created_at desc").Find(&list).Error; err != nil {
		infra.Response.Error(ctx, err)
		return
	}
	infra.Response.Success(ctx, common.ResourceResponse(list))
}

var userTicketCategories = map[string]bool{
	"installation": true, "repair": true, "inspection": true, "reinspection": true, "customer_service": true,
}

// CreateTicket 创建工单，服务人员只能由后台分派。
func CreateTicket(ctx *gin.Context) {
	account, ok := common.UserAccount(ctx)
	if !ok {
		return
	}
	var request struct {
		RequestNo       string               `json:"request_no" binding:"required,max=128"`
		Category        string               `json:"category" binding:"required"`
		Description     string               `json:"description" binding:"required,max=2000"`
		AddressIdentity string               `json:"address_identity"`
		AppointmentAt   *time.Time           `json:"appointment_at"`
		FaultType       string               `json:"fault_type" binding:"omitempty,oneof=leak valve alarm other"`
		Photos          []ticketPhotoRequest `json:"photos" binding:"max=3,dive"`
	}
	if ctx.ShouldBindJSON(&request) != nil || !userTicketCategories[request.Category] || strings.TrimSpace(request.Description) == "" || strings.TrimSpace(request.RequestNo) == "" {
		infra.Response.Error(ctx, errcode.ErrInvalidArgument)
		return
	}
	var ticket models.CsTicket
	err := impl.DBService.Transaction(func(tx *gorm.DB) error {
		// 同一账户串行创建；重试先返回首次事实，不受地址后续修改或删除影响。
		if err := lockAddressOwner(tx, account.ID); err != nil {
			return err
		}
		err := tx.Where("request_no = ? AND user_account_id = ?", request.RequestNo, account.ID).First(&ticket).Error
		if err == nil {
			return nil
		}
		if !errors.Is(err, gorm.ErrRecordNotFound) {
			return err
		}
		if request.AppointmentAt != nil && request.AppointmentAt.Before(time.Now()) {
			return errcode.ErrInvalidArgument
		}
		var relation models.UserServiceRelation
		if err := tx.Where("user_account_id = ? AND status = ?", account.ID, common.StatusEnable).First(&relation).Error; err != nil && !errors.Is(err, gorm.ErrRecordNotFound) {
			return err
		}
		addressText, contactName, contactPhone := "", account.Name, account.Phone
		if request.AddressIdentity != "" {
			var address models.UserAddress
			if err := tx.Where("identity = ? AND user_account_id = ? AND status <> ?", request.AddressIdentity, account.ID, common.StatusArchived).First(&address).Error; err != nil {
				return errcode.ErrRecordNotFound
			}
			addressText = address.Address
			if address.ContactName != "" {
				contactName = address.ContactName
			}
			if address.ContactPhone != "" {
				contactPhone = address.ContactPhone
			}
		}
		ticket = models.CsTicket{
			Entity: common.NewEntity(common.StatusEnable), TicketStatus: 32, TicketNo: common.RecordNo("TK"), RequestNo: request.RequestNo,
			UserAccountID: account.ID, GasBasicID: relation.GasBasicID, DeliveryBasicID: relation.DeliveryBasicID,
			Category: request.Category, Priority: "normal", Description: strings.TrimSpace(request.Description), FaultType: request.FaultType,
			Address: addressText, ContactName: contactName, ContactPhone: contactPhone, AppointmentAt: request.AppointmentAt, OperatorIdentity: account.Identity,
		}
		if err := tx.Create(&ticket).Error; err != nil {
			return err
		}
		return saveTicketPhotos(tx, ticket, account.Identity, request.Photos)
	})
	if err != nil {
		infra.Response.Error(ctx, err)
		return
	}
	infra.Response.Success(ctx, gin.H{"identity": ticket.Identity, "ticket_no": ticket.TicketNo, "ticket_status": ticket.TicketStatus})
}

// ListTickets 仅返回当前用户自己的工单。
func ListTickets(ctx *gin.Context) {
	account, ok := common.UserAccount(ctx)
	if !ok {
		return
	}
	var list []models.CsTicket
	if err := impl.DBService.Where("user_account_id = ? AND status <> ?", account.ID, common.StatusArchived).Order("created_at desc").Find(&list).Error; err != nil {
		infra.Response.Error(ctx, err)
		return
	}
	items := make([]any, 0, len(list))
	photos, err := ticketPhotosForList(list)
	if err != nil {
		infra.Response.Error(ctx, err)
		return
	}
	for _, ticket := range list {
		item := common.ResourceResponse(ticket).(map[string]any)
		item["status_name"], item["allowed_actions"] = ticketState(ticket.TicketStatus)
		item["photos"] = photos[ticket.ID]
		items = append(items, item)
	}
	infra.Response.Success(ctx, items)
}

// ticketState 发布已有状态机允许的动作；未知状态不授予任何写权限。
func ticketState(status int) (string, []string) {
	names := map[int]string{32: "待受理", 18: "已派单", 11: "处理中", 21: "处理异常", 34: "待确认", 23: "已完成", 22: "已取消"}
	name, exists := names[status]
	if !exists {
		name = "状态待核实"
	}
	actions := []string{}
	switch status {
	case 32, 18, 11, 21, 34:
		actions = append(actions, "cancel")
	}
	if status == 34 {
		actions = append(actions, "confirm")
	}
	return name, actions
}

// ConfirmTicket 用户确认工作人员提交的处理结果，重复确认不覆盖完成时间。
func ConfirmTicket(ctx *gin.Context) {
	changeTicketState(ctx, "confirm", 23)
}

// CancelTicket 取消尚未完成的本人工单。
func CancelTicket(ctx *gin.Context) {
	changeTicketState(ctx, "cancel", 22)
}

// changeTicketState 锁定本人工单并校验状态，归档和其他用户的记录不可操作。
func changeTicketState(ctx *gin.Context, action string, target int) {
	account, ok := common.UserAccount(ctx)
	if !ok {
		return
	}
	err := impl.DBService.Transaction(func(tx *gorm.DB) error {
		var ticket models.CsTicket
		if err := tx.Clauses(clause.Locking{Strength: "UPDATE"}).Where("identity = ? AND user_account_id = ? AND status <> ?", ctx.Param("identity"), account.ID, common.StatusArchived).First(&ticket).Error; err != nil {
			return errcode.ErrRecordNotFound
		}
		if ticket.TicketStatus == target {
			return nil
		}
		_, actions := ticketState(ticket.TicketStatus)
		allowed := false
		for _, candidate := range actions {
			allowed = allowed || candidate == action
		}
		if !allowed {
			return errcode.ErrInvalidArgument
		}
		values := map[string]any{"ticket_status": target, "operator_identity": account.Identity}
		if action == "confirm" {
			values["completed_at"] = time.Now()
		}
		return tx.Model(&ticket).Updates(values).Error
	})
	if err != nil {
		infra.Response.Error(ctx, err)
		return
	}
	if action == "confirm" {
		infra.Response.Success(ctx, gin.H{"confirmed": true})
	} else {
		infra.Response.Success(ctx, gin.H{"cancelled": true})
	}
}