PostgreSQLDataTypeStaticRepresentable.swift

/// Statically representable as a `PostgreSQLDataType`.
public protocol PostgreSQLDataTypeStaticRepresentable {
    /// Appropriate PostgreSQL column type for storing this type.
    static var postgreSQLDataType: PostgreSQLDataType { get }
}

/// MARK: Default Implementations

extension Data: PostgreSQLDataTypeStaticRepresentable {
    /// See `PostgreSQLDataTypeStaticRepresentable`.
    public static var postgreSQLDataType: PostgreSQLDataType { return .bytea }
}

extension UUID: PostgreSQLDataTypeStaticRepresentable {
    /// See `PostgreSQLDataTypeStaticRepresentable`.
    public static var postgreSQLDataType: PostgreSQLDataType { return .uuid }
}

extension Date: PostgreSQLDataTypeStaticRepresentable {
    /// See `PostgreSQLDataTypeStaticRepresentable`.
    public static var postgreSQLDataType: PostgreSQLDataType { return .timestamp }
}

extension Int: PostgreSQLDataTypeStaticRepresentable {
    /// See `PostgreSQLDataTypeStaticRepresentable`.
    public static var postgreSQLDataType: PostgreSQLDataType { return .bigint }
}

extension Int8: PostgreSQLDataTypeStaticRepresentable  {
    /// See `PostgreSQLDataTypeStaticRepresentable`.
    public static var postgreSQLDataType: PostgreSQLDataType {
        // PSQL has no single byte int type
        return .smallint
    }
}

extension Int16: PostgreSQLDataTypeStaticRepresentable {
    /// See `PostgreSQLDataTypeStaticRepresentable`.
    public static var postgreSQLDataType: PostgreSQLDataType { return .smallint }
}

extension Int32: PostgreSQLDataTypeStaticRepresentable {
    /// See `PostgreSQLDataTypeStaticRepresentable`.
    public static var postgreSQLDataType: PostgreSQLDataType { return .int }
}

extension Int64: PostgreSQLDataTypeStaticRepresentable {
    /// See `PostgreSQLDataTypeStaticRepresentable`.
    public static var postgreSQLDataType: PostgreSQLDataType { return .bigint }
}

extension UInt: PostgreSQLDataTypeStaticRepresentable {
    /// See `PostgreSQLDataTypeStaticRepresentable`.
    public static var postgreSQLDataType: PostgreSQLDataType { return .bigint }
}

extension UInt8: PostgreSQLDataTypeStaticRepresentable {
    /// See `PostgreSQLDataTypeStaticRepresentable`.
    public static var postgreSQLDataType: PostgreSQLDataType {
        // PSQL has no single byte int type
        return .smallint
    }
}

extension UInt16: PostgreSQLDataTypeStaticRepresentable {
    /// See `PostgreSQLDataTypeStaticRepresentable`.
    public static var postgreSQLDataType: PostgreSQLDataType { return .smallint }
}

extension UInt32: PostgreSQLDataTypeStaticRepresentable {
    /// See `PostgreSQLDataTypeStaticRepresentable`.
    public static var postgreSQLDataType: PostgreSQLDataType { return .int }
}

extension UInt64: PostgreSQLDataTypeStaticRepresentable {
    /// See `PostgreSQLDataTypeStaticRepresentable`.
    public static var postgreSQLDataType: PostgreSQLDataType { return .bigint }
}

extension Float: PostgreSQLDataTypeStaticRepresentable {
    /// See `PostgreSQLDataTypeStaticRepresentable`.
    public static var postgreSQLDataType: PostgreSQLDataType { return .real }
}

extension Double: PostgreSQLDataTypeStaticRepresentable {
    /// See `PostgreSQLDataTypeStaticRepresentable`.
    public static var postgreSQLDataType: PostgreSQLDataType { return .doublePrecision }
}

extension String: PostgreSQLDataTypeStaticRepresentable {
    /// See `PostgreSQLDataTypeStaticRepresentable`.
    public static var postgreSQLDataType: PostgreSQLDataType { return .text }
}

extension Bool: PostgreSQLDataTypeStaticRepresentable {
    /// See `PostgreSQLDataTypeStaticRepresentable`.
    public static var postgreSQLDataType: PostgreSQLDataType { return .bool }
}

extension PostgreSQLPoint: PostgreSQLDataTypeStaticRepresentable, ReflectionDecodable {
    /// See `PostgreSQLDataTypeStaticRepresentable`.
    public static var postgreSQLDataType: PostgreSQLDataType { return .point }
    
    /// See `ReflectionDecodable`.
    public static func reflectDecoded() throws -> (PostgreSQLPoint, PostgreSQLPoint) {
        return (.init(x: 0, y: 0), .init(x: 1, y: 1))
    }
}

extension PostgreSQLPolygon: PostgreSQLDataTypeStaticRepresentable, ReflectionDecodable {
    /// See `PostgreSQLDataTypeStaticRepresentable`.
    public static var postgreSQLDataType: PostgreSQLDataType { return .polygon }
    
    /// See `ReflectionDecodable`.
    public static func reflectDecoded() throws -> (PostgreSQLPolygon, PostgreSQLPolygon) {
        return (.init(points: [PostgreSQLPoint(x: 0, y: 0)]), .init(points: [PostgreSQLPoint(x: 1, y: 1)]))
    }
}