//
// Copyright 2019 Signal Messenger, LLC
// SPDX-License-Identifier: AGPL-3.0-only
//

import Foundation
import GRDB
import SignalCoreKit

// TODO: We need to revise this.
@objc
public enum SDSColumnType: Int32 {
    case unicodeString
    case blob
    case bool
    case int
    case int64
    case double
    case primaryKey
}

@objc
public class SDSColumnMetadata: NSObject {

    @objc
    public let columnName: String

    @objc
    public let columnType: SDSColumnType

    @objc
    public let isOptional: Bool

    @objc
    public let isUnique: Bool

    // If true, this column isn't needed for deserialization and can be skipped in SELECT statements.
    @objc
    public let skipSelect: Bool

    @objc
    public init(columnName: String, columnType: SDSColumnType, isOptional: Bool = false, isUnique: Bool = false, skipSelect: Bool = false) {
        self.columnName = columnName
        self.columnType = columnType
        self.isOptional = isOptional
        self.isUnique = isUnique
        self.skipSelect = skipSelect
    }
}

// MARK: -

// TODO: Consider adding uniqueIdColumn field.
@objc
public class SDSTableMetadata: NSObject {

    @objc
    public let collection: String

    @objc
    public let tableName: String

    @objc
    public let columns: [SDSColumnMetadata]

    public let databaseSelectionColumns: [Column]

    public let selectColumnNames: [String]

    @objc
    public init(collection: String, tableName: String, columns: [SDSColumnMetadata]) {
        self.collection = collection
        self.tableName = tableName
        self.columns = columns

        databaseSelectionColumns = columns.filter { (columMetaData) in
            return !columMetaData.skipSelect
            }.map { (columMetaData) in
                Column(columMetaData.columnName)
        }

        selectColumnNames = columns.filter { !$0.skipSelect }.map { $0.columnName }
    }

    public var columnNames: [String] {
        return columns.map { $0.columnName }
    }
}