package initialize

import (
	"os"
	"wails-app/internal/dao"

	"go.uber.org/zap"
	"gorm.io/gorm"
	"wails-app/internal/global"
	"wails-app/internal/model/example"
)

func Gorm() *gorm.DB {
	switch global.GVA_CONFIG.System.DbType {
	case "mysql":
		return GormMysql()
	case "pgsql":
		return GormPgSql()
	case "oracle":
		return GormOracle()
	case "mssql":
		return GormMssql()
	case "sqlite":
		return GormSqlite()
	default:
		return GormMysql()
	}
}

func RegisterTables() {
	db := global.GVA_DB
	err := db.AutoMigrate(

		dao.SysApi{},
		dao.SysUser{},
		dao.SysBaseMenu{},
		dao.JwtBlacklist{},
		dao.SysAuthority{},
		dao.SysDictionary{},
		dao.SysOperationRecord{},
		dao.SysDictionaryDetail{},
		dao.SysBaseMenuParameter{},
		dao.SysBaseMenuBtn{},
		dao.SysAuthorityBtn{},

		example.ExaFile{},
		example.ExaFileChunk{},
		dao.ExaFileUploadAndDownload{},

		dao.Vehicle{},
		dao.VehicleType{},
		dao.Owner{},
		dao.FeeConfig{},
		dao.Booth{},
		dao.Channel{},
		dao.ParkingLot{},
		dao.VehicleRecord{},
		dao.PaymentRecord{},
		dao.PaymentMethodConfig{},
		dao.PaymentEntryConfig{},
		dao.PaymentEntryMethod{},
		dao.UHFReader{},
		dao.Camera{},
		dao.Shortlist{},
		dao.MonthlyCard{},
		dao.DigitalTicket{},
		dao.ShiftRecord{},
		dao.Printer{},
	)
	if err != nil {
		global.GVA_LOG.Error("register table failed", zap.Error(err))
		os.Exit(0)
	}
	if err := reconcileParkingLotOccupancy(db); err != nil {
		global.GVA_LOG.Error("reconcile parking lot occupancy failed", zap.Error(err))
	}
	// 操作日志复合索引：created_at 位于 GVA_MODEL 内嵌字段（多表共用，不能加 tag），故显式创建
	// 覆盖高频查询：按用户 + 时间筛选操作日志
	if err := db.Exec("CREATE INDEX IF NOT EXISTS idx_op_user_time ON sys_operation_records (user_id, created_at)").Error; err != nil {
		global.GVA_LOG.Error("create idx_op_user_time failed", zap.Error(err))
	}
	global.GVA_LOG.Info("register table success")
}

// reconcileParkingLotOccupancy 在服务启动时以未出场停车会话为准校准占用数和余位。
func reconcileParkingLotOccupancy(db *gorm.DB) error {
	return db.Transaction(func(tx *gorm.DB) error {
		var lots []dao.ParkingLot
		if err := tx.Find(&lots).Error; err != nil {
			return err
		}
		for _, lot := range lots {
			var occupied int64
			if err := tx.Model(&dao.VehicleRecord{}).
				Where("parking_lot_id = ? AND exit_time IS NULL", lot.ID).
				Count(&occupied).Error; err != nil {
				return err
			}
			available := int64(lot.Capacity) - occupied
			if available < 0 {
				available = 0
			}
			if err := tx.Model(&lot).UpdateColumns(map[string]interface{}{
				"occupied":  occupied,
				"available": available,
			}).Error; err != nil {
				return err
			}
		}
		return nil
	})
}