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Swift data binding generator for multiple data formats including JSON and Avro.
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//
// Copyright 2015 Coursera Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//

import Foundation
import SwiftyJSON

/**
    Serializable to JSON via SwiftyJson
*/
public protocol JSONSerializable {

    /**
    Read from JSON via SwiftyJson.
    */
    static func readJSON(json: JSON) throws -> Self

    /**
    Write to JSON via SwiftyJson.
    */
    func writeJSON() -> JSON
}

/**
    Serializable to:
    "DataTrees" - a "JSON equivalent" data structure composed of the following
    Swift types:

    * `[String: AnyObject]` - Equivalent to a JSON object.
    * `[AnyObject]` - Equivalent to a JSON array.
    * `String`, `Boolean` and numeric types. - Equivalent their respective JSON primitive types.

    Structs and classes are represented as a "DataTree" by an `[String: AnyObject]` map where
    field names used as map keys. If a optional field is `nil` valued it is simply left absent
    from the map.
*/
public protocol DataTreeSerializable {

    /**
    Read from a "DataTree".
    */
    static func readData(data: [String: AnyObject]) throws -> Self

    /**
    Write to a "DataTree".
    */
    func writeData() -> [String: AnyObject]
}

/**
    Serializable to JSON and DataTrees.
*/
public protocol Serializable: JSONSerializable, DataTreeSerializable {}

extension Serializable {
    public static func readData(data: [String: AnyObject]) throws -> Self {
        return try readJSON(JSON(data))
    }

    public func writeJSON() -> JSON {
        return JSON(writeData())
    }
}

/**
    Coercers provide a means of customizing what Swift type Courier binds to a particular
    pegsus type.

    Coercers must be registered in the schema (.pdsc or .courier file).
*/
public protocol Coercer {
    typealias CustomType
    typealias DirectType

    static func coerceInput(value: DirectType) throws -> CustomType
    static func coerceOutput(value: CustomType) -> DirectType
}

public struct ReadError: ErrorType {
    let cause: String
}

extension Dictionary {
    public init(_ elements: [Element]){
        self.init()
        for (k, v) in elements {
            self[k] = v
        }
    }

    public func mapValues(transform: Value throws -> U) rethrows -> [Key : U] {
        return Dictionary(try self.map { (key, value) in (key, try transform(value)) })
    }
}

extension JSON {

    public func optional(expected: Type) throws -> JSON {
        if (self.type != expected && self.type != .Null) {
            throw ReadError(cause: "Wrong Type.")
        }
        return self;
    }

    public func required(expected: Type) throws -> JSON {
        if (self.type != expected) {
            throw ReadError(cause: "Wrong Type.")
        }
        return self;
    }

    //Optional JSON
    public var json: JSON? {
        get {
            switch self.type {
            case .Null:
                return nil
            default:
                return self
            }
        }
        set {
            if let value = newValue {
                self = value
            } else {
                self = nil
            }
        }
    }

    // Not needed, but added to maintain SwiftyJSON consistency.
    // SwiftyJSON expects a corresponding "xyzValue" expr for all "xyz" accessors.
    public var jsonValue: JSON {
        get {
            return self
        }
        set {
            self = newValue
        }
    }
}

// arrays of arrays
func ==(lhs: [[T]], rhs: [[T]]) -> Bool {
    for (var i = 0; i < lhs.count; i++) {
        if (lhs[i] != rhs[i]) {
            return false
        }
    }
    return true
}

// arrays of dictionaries
func ==(lhs: [[K:V]], rhs: [[K:V]]) -> Bool {
    for (var i = 0; i < lhs.count; i++) {
        if (lhs[i] != rhs[i]) {
            return false
        }
    }
    return true
}

// dictionaries of dictionaries
func ==(lhs: [K:[K2:V]], rhs: [K:[K2:V]]) -> Bool {
    if (lhs.count != rhs.count) {
        return false
    }
    for (k, v) in lhs {
        if let rhsv = rhs[k] {
            if (v != rhsv) {
                return false
            }
        } else {
            return false
        }
    }
    return true
}

// dictionaries of arrays
func ==(lhs: [K:[E]], rhs: [K:[E]]) -> Bool {
    if (lhs.count != rhs.count) {
        return false
    }
    for (k, v) in lhs {
        if let rhsv = rhs[k] {
            if (v != rhsv) {
                return false
            }
        } else {
            return false
        }
    }
    return true
}

// dictionaries of arrays of arrays
func ==(lhs: [K:[[E]]], rhs: [K:[[E]]]) -> Bool {
    if (lhs.count != rhs.count) {
        return false
    }
    for (k, v) in lhs {
        if let rhsv = rhs[k] {
            if (!(v == rhsv)) {
                return false
            }
        } else {
            return false
        }
    }
    return true
}