// Copyright (c) 2012-present The upper.io/db authors. All rights reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

package cockroachdb

import (
	db "github.com/upper/db/v4"
	"github.com/upper/db/v4/internal/sqladapter"
)

type collectionAdapter struct {
}

func (*collectionAdapter) Insert(col sqladapter.Collection, item interface{}) (interface{}, error) {
	pKey, err := col.PrimaryKeys()
	if err != nil {
		return nil, err
	}

	q := col.SQL().InsertInto(col.Name()).Values(item)

	if len(pKey) == 0 {
		// There is no primary key.
		res, err := q.Exec()
		if err != nil {
			return nil, err
		}

		// Attempt to use LastInsertId() (probably won't work, but the Exec()
		// succeeded, so we can safely ignore the error from LastInsertId()).
		lastID, err := res.LastInsertId()
		if err != nil {
			return 0, nil
		}
		return lastID, nil
	}

	// Asking the database to return the primary key after insertion.
	q = q.Returning(pKey...)

	var keyMap db.Cond
	if err := q.Iterator().One(&keyMap); err != nil {
		return nil, err
	}

	// The IDSetter interface does not match, look for another interface match.
	if len(keyMap) == 1 {
		return keyMap[pKey[0]], nil
	}

	// This was a compound key and no interface matched it, let's return a map.
	return keyMap, nil
}