/*

    Copyright (C) 2016 Apple Inc. All Rights Reserved.

    See LICENSE.txt for this sample’s licensing information

    Abstract:

    A structure that encapsulates the initial configuration of a level in the game, including the initial states and positions of `TaskBot`s. This information is loaded from a property list.

*/

import Foundation

/// Encapsulates the starting configuration of a level in the game.

struct LevelConfiguration {

    // MARK: Types

    /// Encapsulates the starting configuration of a single `GroundBot` or `FlyingBot`.

    struct TaskBotConfiguration {

        // MARK: Properties

        /// The different types of `TaskBot` that can exist in a level.

        enum Locomotion {

            case ground

            case flying

        }

        let locomotion: Locomotion

        /// The initial orientation of this `TaskBot` when the level is first loaded.

        let initialOrientation: CompassDirection

        /// The names of the nodes for this `TaskBot`'s patrol path when it is "good" and not hunting.

        let goodPathNodeNames: [String]

        /// The names of the nodes for this `TaskBot`'s patrol path when it is "bad" and not hunting.

        let badPathNodeNames: [String]

        /// Whether the bot should be in its "bad" state when the level begins.

        let startsBad: Bool

        // MARK: Initialization

        init(botConfigurationInfo: [String: AnyObject]) {

            switch botConfigurationInfo["locomotion"] as! String {

                case "ground":

                    locomotion = .ground

                case "flying":

                    locomotion = .flying

                default:

                    fatalError("Unknown locomotion found while parsing `taskBot` data")

            }

            initialOrientation = CompassDirection(string: botConfigurationInfo["initialOrientation"] as! String)

            goodPathNodeNames = botConfigurationInfo["goodPathNodeNames"] as! [String]

            badPathNodeNames = botConfigurationInfo["badPathNodeNames"] as! [String]

            startsBad = botConfigurationInfo["startsBad"] as! Bool

        }

    }

    // MARK: Properties

    /// Cached data loaded from the level's data file.

    private let configurationInfo: [String: AnyObject]

    /// The initial orientation of the `PlayerBot` when the level is first loaded.

    let initialPlayerBotOrientation: CompassDirection

    /// The configuration settings for `TaskBots` on this level.

    let taskBotConfigurations: [TaskBotConfiguration]

    /// The file name identifier for this level. Used for loading files and assets.

    let fileName: String

    /**

        Returns the name of the next level, if any. The final level doesn't have a

        next level name, so this property is optional.

    */

    var nextLevelName: String? {

        return configurationInfo["nextLevel"] as! String?

    }

    /// The time limit (in seconds) for this level.

    var timeLimit: TimeInterval {

        return configurationInfo["timeLimit"] as! TimeInterval

    }

    /// The factor used to normalize distances between characters for 'fuzzy' logic.

    var proximityFactor: Float {

        return configurationInfo["proximityFactor"] as! Float

    }

    // MARK: Initialization

    init(fileName: String) {

        self.fileName = fileName

        let url = Bundle.main.url(forResource: fileName, withExtension: "plist")

        configurationInfo = NSDictionary(contentsOf: url!) as! [String: AnyObject]

        // Extract the data for every `TaskBot` in this level as an array of `TaskBotConfiguration` values.

        let botConfigurations = configurationInfo["taskBotConfigurations"] as! [[String: AnyObject]]

        // Map the array of `TaskBot` configuration dictionaries to an array of `TaskBotConfiguration` instances.

        taskBotConfigurations = botConfigurations.map { TaskBotConfiguration(botConfigurationInfo: $0) }

        initialPlayerBotOrientation = CompassDirection(string: configurationInfo["initialPlayerBotOrientation"] as! String)

    }

}