package mdbc

import (
	"context"
	"fmt"
	"gitter.top/common/goref"
	"go.mongodb.org/mongo-driver/bson"
	"go.mongodb.org/mongo-driver/mongo/options"
)

type findScope struct {
	scope   *scope
	mdbc    *mdbc
	ctx     context.Context
	opts    any
	limit   *int64
	skip    *int64
	upsert  *bool
	sort    bson.D
	filter  any
	selects any
	doc     any
}

func (fs *findScope) SetContext(ctx context.Context) *findScope {
	fs.ctx = ctx
	return fs
}

func (fs *findScope) SetFilter(filter any) *findScope {
	if filter == nil {
		fs.filter = bson.M{}
		return fs
	}
	fs.filter = filter
	return fs
}

func (fs *findScope) SetFindOptions(opts options.FindOptions) *findScope {
	fs.opts = &opts
	return fs
}

func (fs *findScope) SetFindOneOptions(opts options.FindOneOptions) *findScope {
	fs.opts = &opts
	return fs
}

func (fs *findScope) SetFindOneAndDeleteOptions(opts options.FindOneAndDeleteOptions) *findScope {
	fs.opts = &opts
	return fs
}

func (fs *findScope) SetFindOneAndUpdateOptions(opts options.FindOneAndUpdateOptions) *findScope {
	fs.opts = &opts
	return fs
}

func (fs *findScope) SetFindOneAndReplaceOptions(opts options.FindOneAndReplaceOptions) *findScope {
	fs.opts = &opts
	return fs
}

func (fs *findScope) SetLimit(limit int64) *findScope {
	fs.limit = &limit
	return fs
}

func (fs *findScope) SetSkip(skip int64) *findScope {
	fs.skip = &skip
	return fs
}

func (fs *findScope) SetUpsert(upsert bool) *findScope {
	fs.upsert = &upsert
	return fs
}

// SetSelects select field, such as: {key: 1, key: 0}
// 1: display 0: hidden
func (fs *findScope) SetSelects(selects any) *findScope {
	if !goref.IsBaseMap(selects) {
		return fs
	}
	fs.selects = selects
	return fs
}

func (fs *findScope) SetSort(sort bson.D) *findScope {
	fs.sort = sort
	return fs
}

func (fs *findScope) findMergeOptions() {
	if fs.ctx == nil {
		fs.ctx = context.Background()
	}
	if fs.filter == nil {
		fs.filter = bson.M{}
	}
	if fs.opts == nil {
		fs.opts = new(options.FindOptions)
	}
	opts := fs.opts.(*options.FindOptions)
	if fs.limit != nil {
		opts.Limit = fs.limit
	}
	if fs.skip == nil {
		opts.Skip = fs.skip
	}
	if fs.sort != nil {
		opts.Sort = fs.sort
	}
	if fs.selects != nil {
		opts.Projection = fs.selects
	}
	fs.opts = opts
}

// GetList get record list, list type is *[]*struct
func (fs *findScope) GetList(list any) error {
	if !goref.IsBaseList(list) {
		return fmt.Errorf("invalid list type, must be *[]*struct")
	}
	fs.findMergeOptions()
	cursor, err := fs.mdbc.database.Collection(fs.scope.tableName).Find(fs.ctx, fs.filter, fs.opts.(*options.FindOptions))
	if err != nil {
		return err
	}
	err = cursor.All(fs.ctx, list)
	if err != nil {
		return err
	}
	return nil
}

// GetMap get record map, m type is *map[string]*struct, field is struct field
func (fs *findScope) GetMap(m any, field string) error {
	if !goref.IsBaseMap(m) {
		return fmt.Errorf("invalid m type, must be based on map")
	}
	fs.findMergeOptions()
	cursor, err := fs.mdbc.database.Collection(fs.scope.tableName).Find(fs.ctx, fs.filter, fs.opts.(*options.FindOptions))
	if err != nil {
		return err
	}
	list := goref.BuildSlice(fs.scope.modelKind)
	err = cursor.All(fs.ctx, list)
	if err != nil {
		return err
	}
	if err := goref.SliceStructToMap(list, m, field); err != nil {
		return err
	}
	return nil
}

func (fs *findScope) findOneMergeOptions() {
	if fs.ctx == nil {
		fs.ctx = context.Background()
	}
	if fs.filter == nil {
		fs.filter = bson.M{}
	}
	if fs.opts == nil {
		fs.opts = new(options.FindOneOptions)
	}
	opts := fs.opts.(*options.FindOneOptions)
	if fs.skip == nil {
		opts.Skip = fs.skip
	}
	if fs.sort != nil {
		opts.Sort = fs.sort
	}
	if fs.selects != nil {
		opts.Projection = fs.selects
	}
	fs.opts = opts
}

func (fs *findScope) FindOne(doc any) error {
	if !goref.IsBaseStruct(doc) {
		return fmt.Errorf("invalid doc type, must be *struct")
	}
	fs.findOneMergeOptions()
	result := fs.mdbc.database.Collection(fs.scope.tableName).FindOne(fs.ctx, fs.filter, fs.opts.(*options.FindOneOptions))
	if result.Err() != nil {
		return result.Err()
	}
	if err := result.Decode(doc); err != nil {
		return err
	}
	return nil
}

func (fs *findScope) findOneAndDeleteMergeOptions() {
	if fs.ctx == nil {
		fs.ctx = context.Background()
	}
	if fs.filter == nil {
		fs.filter = bson.M{}
	}
	if fs.opts == nil {
		fs.opts = new(options.FindOneAndDeleteOptions)
	}
	opts := fs.opts.(*options.FindOneAndDeleteOptions)
	if fs.sort != nil {
		opts.Sort = fs.sort
	}
	if fs.selects != nil {
		opts.Projection = fs.selects
	}
	fs.opts = opts
}

func (fs *findScope) FindOneAndDelete() error {
	fs.findOneAndDeleteMergeOptions()
	result := fs.mdbc.database.Collection(fs.scope.tableName).FindOneAndDelete(fs.ctx, fs.filter, fs.opts.(*options.FindOneAndDeleteOptions))
	if result.Err() != nil {
		return result.Err()
	}
	return nil
}

func (fs *findScope) FindOneAndDeleteWithValue(doc any) error {
	if !goref.IsBaseStruct(doc) {
		return fmt.Errorf("invalid doc type, must be *struct")
	}
	fs.findOneAndDeleteMergeOptions()
	result := fs.mdbc.database.Collection(fs.scope.tableName).FindOneAndDelete(fs.ctx, fs.filter, fs.opts.(*options.FindOneAndDeleteOptions))
	if result.Err() != nil {
		return result.Err()
	}
	if err := result.Decode(doc); err != nil {
		return err
	}
	return nil
}

func (fs *findScope) findOneAndUpdateMergeOptions() {
	if fs.ctx == nil {
		fs.ctx = context.Background()
	}
	if fs.filter == nil {
		fs.filter = bson.M{}
	}
	if fs.opts == nil {
		fs.opts = new(options.FindOneAndUpdateOptions)
	}
	opts := fs.opts.(*options.FindOneAndUpdateOptions)
	if fs.sort != nil {
		opts.Sort = fs.sort
	}
	if fs.upsert != nil {
		opts.Upsert = fs.upsert
	}
	if fs.selects != nil {
		opts.Projection = fs.selects
	}
	fs.opts = opts
	if goref.IsBaseStruct(fs.doc) {
		fs.doc = bson.M{"$set": fs.doc}
	}
	if goref.IsBaseMap(fs.doc) && !goref.ExistMapKey(fs.doc, "$set") {
		fs.doc = bson.M{"$set": fs.doc}
	}
}

// FindOneAndUpdate find one and update, doc type *struct or map
func (fs *findScope) FindOneAndUpdate(doc any) error {
	fs.doc = doc
	fs.findOneAndUpdateMergeOptions()
	result := fs.mdbc.database.Collection(fs.scope.tableName).FindOneAndUpdate(fs.ctx, fs.filter, fs.doc, fs.opts.(*options.FindOneAndUpdateOptions))
	if result.Err() != nil {
		return result.Err()
	}
	return nil
}

func (fs *findScope) findOneAndReplaceMergeOptions() {
	if fs.ctx == nil {
		fs.ctx = context.Background()
	}
	if fs.filter == nil {
		fs.filter = bson.M{}
	}
	if fs.opts == nil {
		fs.opts = new(options.FindOneAndReplaceOptions)
	}
	opts := fs.opts.(*options.FindOneAndReplaceOptions)
	if fs.sort != nil {
		opts.Sort = fs.sort
	}
	if fs.upsert != nil {
		opts.Upsert = fs.upsert
	}
	if fs.selects != nil {
		opts.Projection = fs.selects
	}
	fs.opts = opts
	if goref.IsBaseStruct(fs.doc) {
		fs.doc = bson.M{"$set": fs.doc}
	}
	if goref.IsBaseMap(fs.doc) && !goref.ExistMapKey(fs.doc, "$set") {
		fs.doc = bson.M{"$set": fs.doc}
	}
}

// FindOneAndReplace find one and replace, doc type *struct or map
func (fs *findScope) FindOneAndReplace(doc any) error {
	fs.doc = doc
	fs.findOneAndReplaceMergeOptions()
	result := fs.mdbc.database.Collection(fs.scope.tableName).FindOneAndReplace(fs.ctx, fs.filter, fs.doc, fs.opts.(*options.FindOneAndReplaceOptions))
	if result.Err() != nil {
		return result.Err()
	}
	return nil
}