package model

import (
	"context"
	"fmt"

	"permission/reborn-mongo/domain/entity"

	"github.com/zeromicro/go-zero/core/stores/cache"
	"github.com/zeromicro/go-zero/core/stores/monc"
	"go.mongodb.org/mongo-driver/bson"
	"go.mongodb.org/mongo-driver/bson/primitive"
	"go.mongodb.org/mongo-driver/mongo/options"
)

var _ PermissionModel = (*customPermissionModel)(nil)

type (
	// PermissionModel go-zero model 介面
	PermissionModel interface {
		Insert(ctx context.Context, data *entity.Permission) error
		FindOne(ctx context.Context, id primitive.ObjectID) (*entity.Permission, error)
		FindOneByName(ctx context.Context, name string) (*entity.Permission, error)
		FindOneByHTTP(ctx context.Context, path, method string) (*entity.Permission, error)
		FindMany(ctx context.Context, filter bson.M, opts ...*options.FindOptions) ([]*entity.Permission, error)
		FindAllActive(ctx context.Context) ([]*entity.Permission, error)
		Update(ctx context.Context, data *entity.Permission) error
		Delete(ctx context.Context, id primitive.ObjectID) error
	}

	customPermissionModel struct {
		*monc.Model
	}
)

// NewPermissionModel 建立 Permission Model (帶 cache)
func NewPermissionModel(url, db, collection string, c cache.CacheConf) PermissionModel {
	return &customPermissionModel{
		Model: monc.MustNewModel(url, db, collection, c),
	}
}

func (m *customPermissionModel) Insert(ctx context.Context, data *entity.Permission) error {
	if data.ID.IsZero() {
		data.ID = primitive.NewObjectID()
	}
	data.TimeStamp = entity.NewTimeStamp()

	key := permissionIDKey(data.ID)
	_, err := m.InsertOneNoCache(ctx, key, data)
	return err
}

func (m *customPermissionModel) FindOne(ctx context.Context, id primitive.ObjectID) (*entity.Permission, error) {
	var data entity.Permission
	key := permissionIDKey(id)

	err := m.Model.FindOneNoCache(ctx, &data, bson.M{
		"_id":    id,
		"status": bson.M{"$ne": entity.StatusDeleted},
	})

	if err != nil {
		if err == monc.ErrNotFound {
			return nil, ErrNotFound
		}
		return nil, err
	}

	return &data, nil
}

func (m *customPermissionModel) FindOneByName(ctx context.Context, name string) (*entity.Permission, error) {
	var data entity.Permission
	key := permissionNameKey(name)

	err := m.FindOne(ctx, key, &data, func() (interface{}, error) {
		err := m.Model.FindOne(ctx, &data, bson.M{
			"name":   name,
			"status": bson.M{"$ne": entity.StatusDeleted},
		})
		if err != nil {
			return nil, err
		}
		return &data, nil
	})

	if err != nil {
		if err == monc.ErrNotFound {
			return nil, ErrNotFound
		}
		return nil, err
	}

	return &data, nil
}

func (m *customPermissionModel) FindOneByHTTP(ctx context.Context, path, method string) (*entity.Permission, error) {
	var data entity.Permission
	key := permissionHTTPKey(path, method)

	err := m.FindOne(ctx, key, &data, func() (interface{}, error) {
		err := m.Model.FindOne(ctx, &data, bson.M{
			"http_path":   path,
			"http_method": method,
			"status":      bson.M{"$ne": entity.StatusDeleted},
		})
		if err != nil {
			return nil, err
		}
		return &data, nil
	})

	if err != nil {
		if err == monc.ErrNotFound {
			return nil, ErrNotFound
		}
		return nil, err
	}

	return &data, nil
}

func (m *customPermissionModel) FindMany(ctx context.Context, filter bson.M, opts ...*options.FindOptions) ([]*entity.Permission, error) {
	if filter == nil {
		filter = bson.M{}
	}
	filter["status"] = bson.M{"$ne": entity.StatusDeleted}

	var data []*entity.Permission
	err := m.Model.Find(ctx, &data, filter, opts...)
	if err != nil {
		return nil, err
	}

	return data, nil
}

func (m *customPermissionModel) FindAllActive(ctx context.Context) ([]*entity.Permission, error) {
	key := "cache:permission:list:active"

	var data []*entity.Permission
	err := m.QueryRow(ctx, &data, key, func(conn *monc.Model) error {
		return m.Model.Find(ctx, &data, bson.M{"status": entity.StatusActive}, options.Find().SetSort(bson.D{{Key: "parent_id", Value: 1}, {Key: "_id", Value: 1}}))
	})

	if err != nil {
		return nil, err
	}

	return data, nil
}

func (m *customPermissionModel) Update(ctx context.Context, data *entity.Permission) error {
	data.UpdateTimestamp()

	key := permissionIDKey(data.ID)
	_, err := m.Model.ReplaceOneNoCache(ctx, key, bson.M{"_id": data.ID}, data)
	return err
}

func (m *customPermissionModel) Delete(ctx context.Context, id primitive.ObjectID) error {
	key := permissionIDKey(id)

	_, err := m.Model.UpdateOneNoCache(ctx, key, bson.M{"_id": id}, bson.M{
		"$set": bson.M{
			"status":      entity.StatusDeleted,
			"update_time": entity.NewTimeStamp().UpdateTime,
		},
	})

	return err
}

// Cache keys
func permissionIDKey(id primitive.ObjectID) string {
	return fmt.Sprintf("cache:permission:id:%s", id.Hex())
}

func permissionNameKey(name string) string {
	return fmt.Sprintf("cache:permission:name:%s", name)
}

func permissionHTTPKey(path, method string) string {
	return fmt.Sprintf("cache:permission:http:%s:%s", method, path)
}