package repository

import (
	"gorm.io/gorm"
	"wails-app/internal/dao"
	"wails-app/internal/global"
)

type TicketRepository struct{}

func (r *TicketRepository) Create(ticket *dao.DigitalTicket) error {
	return r.CreateTx(global.GVA_DB, ticket)
}

func (r *TicketRepository) CreateTx(db *gorm.DB, ticket *dao.DigitalTicket) error {
	return db.Create(ticket).Error
}

func (r *TicketRepository) GetByTicketNo(ticketNo string) (*dao.DigitalTicket, error) {
	var t dao.DigitalTicket
	err := global.GVA_DB.Where("ticket_no = ?", ticketNo).First(&t).Error
	if err != nil {
		return nil, err
	}
	return &t, nil
}

func (r *TicketRepository) GetByID(id uint) (*dao.DigitalTicket, error) {
	return r.GetByIDTx(global.GVA_DB, id)
}

func (r *TicketRepository) GetByIDTx(db *gorm.DB, id uint) (*dao.DigitalTicket, error) {
	var t dao.DigitalTicket
	err := db.First(&t, id).Error
	if err != nil {
		return nil, err
	}
	return &t, nil
}

func (r *TicketRepository) UpdateState(id uint, state string, updates map[string]interface{}) error {
	return r.UpdateStateTx(global.GVA_DB, id, state, updates)
}

func (r *TicketRepository) GetByVehicleRecordID(recordID uint) (*dao.DigitalTicket, error) {
	return r.GetByVehicleRecordIDTx(global.GVA_DB, recordID)
}

func (r *TicketRepository) GetByVehicleRecordIDTx(db *gorm.DB, recordID uint) (*dao.DigitalTicket, error) {
	var t dao.DigitalTicket
	err := db.Where("vehicle_record_id = ?", recordID).Order("id DESC").First(&t).Error
	if err != nil {
		return nil, err
	}
	return &t, nil
}

func (r *TicketRepository) UpdateStateTx(db *gorm.DB, id uint, state string, updates map[string]interface{}) error {
	updates["state"] = state
	return db.Model(&dao.DigitalTicket{}).Where("id = ?", id).Updates(updates).Error
}

type TicketListQuery struct {
	PlateNumber string `form:"plate_number"`
	State       string `form:"state"`
	Page        int    `form:"page"`
	PageSize    int    `form:"page_size"`
}

type TicketSummary struct {
	Total   int64 `json:"total"`
	Pending int64 `json:"pending"`
	Paid    int64 `json:"paid"`
	Exited  int64 `json:"exited"`
	Expired int64 `json:"expired"`
}

func (r *TicketRepository) List(q TicketListQuery) ([]dao.DigitalTicket, int64, error) {
	db := ticketQuery(q, true)
	var total int64
	db.Count(&total)
	if q.Page <= 0 {
		q.Page = 1
	}
	if q.PageSize <= 0 {
		q.PageSize = 10
	}
	var list []dao.DigitalTicket
	err := db.Order("digital_ticket.id DESC").Offset((q.Page - 1) * q.PageSize).Limit(q.PageSize).Find(&list).Error
	return list, total, err
}

// Summary returns counts for the complete filtered result set. Pagination and
// the selected state tab are intentionally ignored so the dashboard totals do
// not change when the user moves between pages.
func (r *TicketRepository) Summary(q TicketListQuery) (TicketSummary, error) {
	db := ticketQuery(q, false)

	var rows []struct {
		State string
		Count int64
	}
	if err := db.Select("digital_ticket.state, COUNT(*) AS count").Group("digital_ticket.state").Scan(&rows).Error; err != nil {
		return TicketSummary{}, err
	}

	var summary TicketSummary
	for _, row := range rows {
		summary.Total += row.Count
		switch row.State {
		case "created", "pending_payment":
			summary.Pending += row.Count
		case "paid":
			summary.Paid += row.Count
		case "exited":
			summary.Exited += row.Count
		case "expired":
			summary.Expired += row.Count
		}
	}
	return summary, nil
}

// ticketQuery applies filters shared by the paged list and the unpaged
// summary. A left join keeps old tickets searchable even when their copied
// plate_number column is empty and the vehicle record still has the plate.
func ticketQuery(q TicketListQuery, includeState bool) *gorm.DB {
	db := global.GVA_DB.Model(&dao.DigitalTicket{})
	if q.PlateNumber != "" {
		like := "%" + q.PlateNumber + "%"
		db = db.Joins("LEFT JOIN vehicle_record ON vehicle_record.id = digital_ticket.vehicle_record_id").
			Where("(digital_ticket.plate_number LIKE ? OR vehicle_record.plate_number LIKE ?)", like, like)
	}
	if includeState && q.State != "" {
		if q.State == "pending_payment" {
			db = db.Where("digital_ticket.state IN ?", []string{"created", "pending_payment"})
		} else {
			db = db.Where("digital_ticket.state = ?", q.State)
		}
	}
	return db
}