package packagecustomer

import (
	"context"
	"strings"

	"git.5iot.com/iotlcm-public/iotlcm-admin-svr/internal/dao"
	"git.5iot.com/iotlcm-public/iotlcm-admin-svr/internal/model/do"
	"git.5iot.com/iotlcm-public/iotlcm-admin-svr/internal/model/entity"

	"github.com/gogf/gf/v2/database/gdb"
	"github.com/gogf/gf/v2/errors/gerror"
	"github.com/gogf/gf/v2/frame/g"
	"github.com/gogf/gf/v2/os/gtime"
)

type packageRow struct {
	PackageCode string `orm:"package_code"`
	PackageName string `orm:"package_name"`
}

func SyncDeptPackagesByDept(ctx context.Context, tenantId string, deptId int64, userId int64) error {
	tenantId = strings.TrimSpace(tenantId)
	if tenantId == "" {
		return gerror.New("tenantId is empty")
	}
	if deptId <= 0 {
		return gerror.New("deptId is empty")
	}
	return g.DB().Transaction(ctx, func(ctx context.Context, tx gdb.TX) error {
		dept, err := lockDept(ctx, tx, tenantId, deptId)
		if err != nil {
			return err
		}
		packages, err := loadDeptPackages(ctx, tx, tenantId, dept)
		if err != nil {
			return err
		}
		return rebuildDeptPackages(ctx, tx, tenantId, dept, userId, packages)
	})
}

func lockDept(ctx context.Context, tx gdb.TX, tenantId string, deptId int64) (*entity.SysDept, error) {
	var dept *entity.SysDept
	err := tx.Ctx(ctx).Model(dao.SysDept.Table()).
		Where(dao.SysDept.Columns().TenantId, tenantId).
		Where(dao.SysDept.Columns().DeptId, deptId).
		WhereNull(dao.SysDept.Columns().DeletedAt).
		LockUpdate().
		Limit(1).
		Scan(&dept)
	if err != nil {
		return nil, gerror.Wrap(err, "load package customer sync dept failed")
	}
	if dept == nil || dept.DeptId <= 0 {
		return nil, gerror.New("package customer sync dept not found")
	}
	return dept, nil
}

func loadDeptPackages(ctx context.Context, tx gdb.TX, tenantId string, dept *entity.SysDept) ([]packageRow, error) {
	if deptIsTop(dept) {
		var packages []packageRow
		err := tx.Ctx(ctx).Model(dao.TSimFlowPackageInfo.Table()).
			Fields(dao.TSimFlowPackageInfo.Columns().PackageCode, dao.TSimFlowPackageInfo.Columns().PackageName).
			Where(dao.TSimFlowPackageInfo.Columns().TenantId, tenantId).
			Scan(&packages)
		if err != nil {
			return nil, gerror.Wrap(err, "load top dept packages failed")
		}
		return packages, nil
	}

	cardTable := dao.TSimCardInfo.Table()
	pkgTable := dao.TSimFlowPackageInfo.Table()
	var packages []packageRow
	err := tx.Ctx(ctx).Model(dao.TSimCardInfo.Table()).
		LeftJoin(pkgTable, cardTable+"."+dao.TSimCardInfo.Columns().CurrentPackageCode+" = "+pkgTable+"."+dao.TSimFlowPackageInfo.Columns().PackageCode).
		Fields(
			"DISTINCT "+cardTable+"."+dao.TSimCardInfo.Columns().CurrentPackageCode+" AS package_code",
			pkgTable+"."+dao.TSimFlowPackageInfo.Columns().PackageName+" AS package_name",
		).
		Where(cardTable+"."+dao.TSimCardInfo.Columns().TenantId, tenantId).
		Where(cardTable+"."+dao.TSimCardInfo.Columns().DeptId, dept.DeptId).
		Where(pkgTable+"."+dao.TSimFlowPackageInfo.Columns().TenantId, tenantId).
		Where(cardTable+"."+dao.TSimCardInfo.Columns().CurrentPackageCode+" IS NOT NULL").
		Where(cardTable+"."+dao.TSimCardInfo.Columns().CurrentPackageCode+" <> ?", "").
		Where(pkgTable + "." + dao.TSimFlowPackageInfo.Columns().PackageCode + " IS NOT NULL").
		Scan(&packages)
	if err != nil {
		return nil, gerror.Wrap(err, "load dept packages failed")
	}
	return packages, nil
}

func rebuildDeptPackages(ctx context.Context, tx gdb.TX, tenantId string, dept *entity.SysDept, userId int64, packages []packageRow) error {
	if _, err := tx.Ctx(ctx).Model(dao.TPackageCustomer.Table()).
		Where(dao.TPackageCustomer.Columns().TenantId, tenantId).
		Where(dao.TPackageCustomer.Columns().DeptId, dept.DeptId).
		Delete(); err != nil {
		return gerror.Wrap(err, "clear dept package customer relation failed")
	}

	now := gtime.Now()
	rows := make([]do.TPackageCustomer, 0, len(packages))
	seen := make(map[string]struct{}, len(packages))
	for _, item := range packages {
		packageCode := strings.TrimSpace(item.PackageCode)
		if packageCode == "" {
			continue
		}
		if _, ok := seen[packageCode]; ok {
			continue
		}
		seen[packageCode] = struct{}{}
		rows = append(rows, do.TPackageCustomer{
			PackageCode: packageCode,
			PackageName: strings.TrimSpace(item.PackageName),
			DeptId:      dept.DeptId,
			DeptName:    strings.TrimSpace(dept.DeptName),
			TenantId:    tenantId,
			CreatedDept: dept.DeptId,
			CreatedBy:   userId,
			CreatedAt:   now,
			UpdatedBy:   userId,
			UpdatedAt:   now,
		})
	}
	if len(rows) == 0 {
		return nil
	}
	if _, err := tx.Ctx(ctx).Model(dao.TPackageCustomer.Table()).Data(rows).Insert(); err != nil {
		return gerror.Wrap(err, "insert dept package customer relation failed")
	}
	return nil
}

func deptIsTop(dept *entity.SysDept) bool {
	if dept == nil {
		return false
	}
	return dept.ParentId == 0 || strings.Trim(dept.Ancestors, ",") == "0"
}