package repository

import (
	"context"
	"fmt"
	"time"

	"code.30cm.net/digimon/app-cloudep-permission-server/pkg/domain/entity"
	"code.30cm.net/digimon/app-cloudep-permission-server/pkg/domain/repository"
	mgo "code.30cm.net/digimon/library-go/mongo"
	"github.com/zeromicro/go-zero/core/stores/mon"
	"go.mongodb.org/mongo-driver/bson"
	"go.mongodb.org/mongo-driver/bson/primitive"
	"go.mongodb.org/mongo-driver/mongo"
)

// UserRoleRepositoryParam 定義 MongoDB 配置參數
type UserRoleRepositoryParam struct {
	Conf   *mgo.Conf
	DBOpts []mon.Option
}

// userRoleRepository 實作 repository.UserRoleRepository 介面
type userRoleRepository struct {
	DB mgo.DocumentDBUseCase
}

// NewUserRoleRepository 初始化 `UserRoleRepository`
func NewUserRoleRepository(param UserRoleRepositoryParam) repository.UserRoleRepository {
	e := entity.UserRole{}
	db, err := mgo.NewDocumentDB(param.Conf, e.Collection(), param.DBOpts...)
	if err != nil {
		panic(err)
	}

	return &userRoleRepository{
		DB: db,
	}
}

// GetAll 取得所有 UserRole
func (repo *userRoleRepository) GetAll(ctx context.Context) ([]*entity.UserRole, error) {
	var result []*entity.UserRole
	err := repo.DB.GetClient().Find(ctx, &result, bson.M{})
	if err != nil {
		return nil, err
	}

	return result, nil
}

// GetByUserID 透過 UID 查詢 UserRole
func (repo *userRoleRepository) GetByUserID(ctx context.Context, uid string) (entity.UserRole, error) {
	var result entity.UserRole
	err := repo.DB.GetClient().FindOne(ctx, &result, bson.M{"uid": uid})
	if err != nil {
		return entity.UserRole{}, err
	}

	return result, nil
}

// GetUsersByRoleID 透過 RoleID 查詢所有使用此角色的使用者
func (repo *userRoleRepository) GetUsersByRoleID(ctx context.Context, roleID string) ([]entity.UserRole, error) {
	var result []entity.UserRole
	err := repo.DB.GetClient().Find(ctx, &result, bson.M{"role_id": roleID})
	if err != nil {
		return nil, err
	}

	return result, nil
}

// CountUsersByRole 統計每個角色的使用者數量
func (repo *userRoleRepository) CountUsersByRole(ctx context.Context) ([]repository.RoleUserCount, error) {
	pipeline := []bson.M{
		{"$group": bson.M{
			"_id":   "$role_id",
			"count": bson.M{"$sum": 1},
		}},
	}

	var result []repository.RoleUserCount
	err := repo.DB.GetClient().Aggregate(ctx, &result, pipeline)
	if err != nil {
		return nil, err
	}

	return result, nil
}

// CreateUserRole 新增使用者角色
func (repo *userRoleRepository) CreateUserRole(ctx context.Context, param entity.UserRole) error {
	if param.UID == "" {
		return fmt.Errorf("uid can't be empty")
	}

	if param.RoleID == "" {
		return fmt.Errorf("role_id can't be empty")
	}

	if param.ID.IsZero() {
		now := time.Now().UTC().UnixNano()
		param.ID = primitive.NewObjectID()
		param.CreateAt = now
		param.UpdateAt = now
	}

	_, err := repo.DB.GetClient().InsertOne(ctx, param)

	return err
}

// UpdateUserRole 更新使用者角色
func (repo *userRoleRepository) UpdateUserRole(ctx context.Context, uid, roleID string) (entity.UserRole, error) {
	filter := bson.M{"uid": uid}
	update := bson.M{
		"$set": bson.M{
			"role_id":   roleID,
			"update_at": time.Now().UTC().UnixNano(),
		},
	}

	var updated entity.UserRole
	err := repo.DB.GetClient().FindOneAndUpdate(ctx, &updated, filter, update)
	if err != nil {
		return entity.UserRole{}, err
	}

	return updated, nil
}

func (repo *userRoleRepository) Index20250225UP(ctx context.Context) (*mongo.Cursor, error) {
	repo.DB.PopulateIndex(ctx, "role_id", 1, false)
	repo.DB.PopulateIndex(ctx, "uid", 1, true)

	return repo.DB.GetClient().Indexes().List(ctx)
}