package service

import (
	"fmt"
	"time"
	"wails-app/internal/dao"
	"wails-app/internal/global"
)

type PrintService struct{}

func NewPrintService() *PrintService { return &PrintService{} }

type csnUSBDevice struct{}

func (csnUSBDevice) Write(data []byte) int              { return Csn_WriteData(data) }
func (csnUSBDevice) FeedLines(n int)                    { csn_FeedLines(n) }
func (csnUSBDevice) QRCode(data string, width int) bool { return csn_QRCode(data, width) }
func (csnUSBDevice) FullCut()                           { csn_FullCut() }

func (s *PrintService) PrintTicket(printerID uint, lotName, channelCode, plateNo string, ticketID uint, ticketNo string) error {
	var printer dao.Printer
	if err := global.GVA_DB.First(&printer, printerID).Error; err != nil {
		return fmt.Errorf("打印机未配置: id=%d", printerID)
	}

	var err error
	var srl *SerialPrinter
	var usbHandle uintptr
	useCSN := false

	if len(printer.PortName) >= 3 && printer.PortName[:3] == "COM" {
		srl, err = NewSerialPrinter(printer.PortName, printer.BaudRate)
		if err == nil {
			defer srl.Close()
		}
	} else {
		// USB → CSN SDK 直连
		err = InitCSN(FindCsnDllPath())
		if err != nil {
			return fmt.Errorf("加载 CSN DLL 失败: %w", err)
		}
		Csn_EnumUSB()
		Csn_EnumPRN()
		name := printer.PortName
		usbHandle, err = Csn_OpenUSB(name)
		if err != nil {
			usbHandle, err = Csn_OpenPRN(name)
		}
		if err != nil {
			return fmt.Errorf("打开打印机失败: %w (name=%s)", err, name)
		}
		useCSN = true
		Csn_SetPort(usbHandle)
		defer csn_Close(usbHandle)
	}

	now := time.Now().Format("02-01-2006 15:04:05")
	slipNo := fmt.Sprintf("%d", ticketID)

	if useCSN {
		ops := buildUSBTicketLayout(usbTicketData{
			lotName: lotName, channelCode: channelCode, plateNo: plateNo,
			entryTime: now, slipNo: slipNo, ticketNo: ticketNo,
		})
		if err := executeUSBLayout(csnUSBDevice{}, ops); err != nil {
			return err
		}

		global.GVA_DB.Model(&printer).Update("status", "online")
		return nil
	}

	// === 串口模式 (保持不变) ===
	write := func(data []byte) { srl.Write(data) }
	line32 := "================================"
	write(InitCmd)
	write(AlignCenterCmd)
	write(DoubleHeightCmd)
	write(BoldOnCmd)
	write(ESCPOS_Text("PARKING TICKET"))
	write(BoldOffCmd)
	write(NormalCmd)
	write(ESCPOS_Text(""))
	write(ESCPOS_Text(lotName))
	write(ESCPOS_Text("A-General Car"))
	write(ESCPOS_Text(""))
	write(ESCPOS_Text("PARK AT YOUR OWN RISK"))
	write(ESCPOS_Text(line32))
	write(AlignLeftCmd)
	write(ESCPOS_Text("In-Time::" + now))
	if channelCode != "" {
		write(ESCPOS_Text("InGate::" + channelCode))
	}
	if plateNo != "" {
		write(ESCPOS_Text("Veh No::" + plateNo))
	}
	write(ESCPOS_Text(line32))
	write(ESCPOS_Text("Slip No::" + slipNo))
	write(ESCPOS_Text(line32))
	write(AlignCenterCmd)
	write(ESCPOS_Text(""))
	write(ESCPOS_QRCode(ticketNo))
	write(ESCPOS_Text(""))
	write(AlignCenterCmd)
	write(ESCPOS_Text("SCAN AND PAY WITH"))
	write(ESCPOS_Text("NEW THE CANADIA BANK APP"))
	write(InitCmd)
	write(ESCPOS_Text(""))
	write(ESCPOS_Text(""))
	write(ESCPOS_Text(""))
	write(CutPaperCmd)

	global.GVA_DB.Model(&printer).Update("status", "online")
	return nil
}