package services

import (
	"platform/pkg/u"
	"platform/web/core"
	m "platform/web/models"
	q "platform/web/queries"
	"time"

	"golang.org/x/crypto/bcrypt"
	"gorm.io/gen/field"
)

var Admin = &adminService{}

type adminService struct{}

func (s *adminService) Page(req core.PageReq) (result []*m.Admin, count int64, err error) {
	return q.Admin.
		Preload(q.Admin.Roles).
		Omit(q.Admin.Password).
		Order(q.Admin.CreatedAt.Desc()).
		FindByPage(req.GetOffset(), req.GetLimit())
}

func (s *adminService) All() (result []*m.Admin, err error) {
	return q.Admin.
		Omit(q.Admin.Password).
		Order(q.Admin.CreatedAt.Desc()).
		Find()
}

func (s *adminService) Create(create *CreateAdmin) error {
	// 哈希密码
	hash, err := bcrypt.GenerateFromPassword([]byte(create.Password), bcrypt.DefaultCost)
	if err != nil {
		return core.NewServErr("密码加密失败", err)
	}

	return q.Q.Transaction(func(q *q.Query) error {
		// 创建管理员
		admin := &m.Admin{
			Username: create.Username,
			Password: string(hash),
			Name:     create.Name,
			Avatar:   create.Avatar,
			Phone:    create.Phone,
			Email:    create.Email,
			Status:   u.Else(create.Status, m.AdminStatusEnabled),
		}
		if err := q.Admin.Create(admin); err != nil {
			return err
		}

		// 关联角色
		if len(create.Roles) > 0 {
			links := make([]*m.LinkAdminRole, len(create.Roles))
			for i, roleID := range create.Roles {
				links[i] = &m.LinkAdminRole{
					AdminID: admin.ID,
					RoleID:  roleID,
				}
			}
			if err := q.LinkAdminRole.CreateInBatches(links, 1000); err != nil {
				return err
			}
		}

		return nil
	})
}

type CreateAdmin struct {
	Username string         `json:"username" validate:"required,min=3,max=50"`
	Password string         `json:"password" validate:"required,min=6,max=50"`
	Name     *string        `json:"name"`
	Avatar   *string        `json:"avatar"`
	Phone    *string        `json:"phone"`
	Email    *string        `json:"email"`
	Status   *m.AdminStatus `json:"status"`
	Roles    []int32        `json:"roles"`
}

func (s *adminService) Update(update *UpdateAdmin) error {
	simples := make([]field.AssignExpr, 0)

	if update.Password != nil {
		hash, err := bcrypt.GenerateFromPassword([]byte(*update.Password), bcrypt.DefaultCost)
		if err != nil {
			return core.NewServErr("密码加密失败", err)
		}
		simples = append(simples, q.Admin.Password.Value(string(hash)))
	}
	if update.Name != nil {
		simples = append(simples, q.Admin.Name.Value(*update.Name))
	}
	if update.Avatar != nil {
		simples = append(simples, q.Admin.Avatar.Value(*update.Avatar))
	}
	if update.Phone != nil {
		simples = append(simples, q.Admin.Phone.Value(*update.Phone))
	}
	if update.Email != nil {
		simples = append(simples, q.Admin.Email.Value(*update.Email))
	}
	if update.Status != nil {
		simples = append(simples, q.Admin.Status.Value(int(*update.Status)))
	}

	return q.Q.Transaction(func(q *q.Query) error {
		// 更新管理员基本信息
		if len(simples) > 0 {
			_, err := q.Admin.
				Where(
					q.Admin.ID.Eq(update.Id),
					q.Admin.Lock.Is(false),
				).
				UpdateSimple(simples...)
			if err != nil {
				return err
			}
		}

		// 更新角色关联
		if update.Roles != nil {
			roles := *update.Roles
			if _, err := q.LinkAdminRole.Where(q.LinkAdminRole.AdminID.Eq(update.Id)).Delete(); err != nil {
				return err
			}
			if len(roles) > 0 {
				links := make([]*m.LinkAdminRole, len(roles))
				for i, roleID := range roles {
					links[i] = &m.LinkAdminRole{
						AdminID: update.Id,
						RoleID:  roleID,
					}
				}
				if err := q.LinkAdminRole.CreateInBatches(links, 1000); err != nil {
					return err
				}
			}
		}

		return nil
	})
}

type UpdateAdmin struct {
	Id       int32          `json:"id" validate:"required"`
	Password *string        `json:"password"`
	Name     *string        `json:"name"`
	Avatar   *string        `json:"avatar"`
	Phone    *string        `json:"phone"`
	Email    *string        `json:"email"`
	Status   *m.AdminStatus `json:"status"`
	Roles    *[]int32       `json:"roles"`
}

func (s *adminService) Remove(id int32) error {
	_, err := q.Admin.
		Where(
			q.Admin.ID.Eq(id),
			q.Admin.Lock.Is(false),
		).
		UpdateColumn(q.Admin.DeletedAt, time.Now())
	return err
}