/**
 * ConfigSystem - Centralized configuration management for Tower of Time
 *
 * This system holds all game constants and configuration values in one place,
 * making it easy to tweak game balance and enable configuration from menus.
 *
 * Features:
 * - Centralized game constants
 * - Enemy type configurations
 * - Wave configurations
 * - Player settings
 * - Energy system settings
 * - Goal and building configurations
 * - Energy crystal properties
 */

import { Wave } from "./WaveSystem";

// Enemy type configuration interface
export interface EnemyTypeConfig {
  name: string;
  speed: number;
  maxHp: number;
  tintColor: number;
  boss?: boolean;
}

// Building configuration interface
export interface BuildingConfig {
  name: string;
  energyCost: number;
  texture: string;
  description: string;
}

// Tower-specific configuration interface
export interface TowerConfig extends BuildingConfig {
  range: number;
  damage: number;
  shootingInterval: number; // milliseconds between shots
  bulletSpeed?: number; // pixels per second (for bullet-based towers)
  effectInterval?: number; // milliseconds between effects (for effect-based towers)
  effectRadius?: number; // radius for area effects
  slowAmount?: number; // slow multiplier (0.5 = 50% speed)
  slowDuration?: number; // milliseconds slow effect lasts
}

// Energy crystal configuration
export interface EnergyCrystalConfig {
  energyValue: number;
  lifetimeDuration: number; // milliseconds
  warningDuration: number; // milliseconds before expiring
}

// Player configuration
export interface PlayerConfig {
  speed: number; // pixels per second
}

// Energy system configuration
export interface EnergyConfig {
  maxEnergy: number;
  regenerationRate: number; // frames between energy regeneration
  initialEnergy: number;
  rewindCostPerTick: number;
}

// Goal configuration
export interface GoalConfig {
  maxHP: number;
  initialHP: number;
  attackDamage: number; // damage enemies deal per attack
  attackInterval: number; // milliseconds between attacks
  collisionRadius: number; // distance at which enemies can attack
}

// Wave system configuration
export interface WaveSystemConfig {
  waveStartDelay: number; // milliseconds between waves
  overlayDisplayDuration: number; // milliseconds to show wave start overlay
}

// Main configuration interface
export interface GameConfig {
  version: number; // Configuration version for migration
  skipTutorial: boolean; // Skip tutorial and start waves immediately
  rewindRecordingInterval: number; // How often to record rewind states
  player: PlayerConfig;
  energy: EnergyConfig;
  goal: GoalConfig;
  waveSystem: WaveSystemConfig;
  energyCrystal: EnergyCrystalConfig;
  enemyTypes: Record<string, EnemyTypeConfig>;
  towers: Record<string, TowerConfig>;
  waves: Wave[];
}

/**
 * ConfigSystem class - manages all game configuration
 */
export default class ConfigSystem {
  private config: GameConfig;

  constructor(customConfig?: Partial<GameConfig>) {
    // Initialize with default configuration
    this.config = this.getDefaultConfig();

    // Try to load saved configuration from localStorage first
    const savedConfig = this.loadSavedConfig();
    if (savedConfig) {
      // Check if migration is needed
      const migratedConfig = this.migrateConfig(savedConfig);
      this.config = this.mergeConfig(this.config, migratedConfig);

      // If migration occurred, save the updated config
      if (migratedConfig !== savedConfig) {
        console.log(
          "ConfigSystem migrated configuration to version",
          this.config.version
        );
        this.saveToLocalStorage();
      } else {
        console.log(
          "ConfigSystem loaded saved configuration from localStorage"
        );
      }
    }

    // Apply any custom configuration overrides
    if (customConfig) {
      this.config = this.mergeConfig(this.config, customConfig);
    }

    console.log("ConfigSystem initialized with configuration:", this.config);
  }

  /**
   * Get the complete configuration object
   */
  public getConfig(): GameConfig {
    return { ...this.config };
  }

  /**
   * Get player configuration
   */
  public getPlayerConfig(): PlayerConfig {
    return { ...this.config.player };
  }

  /**
   * Get energy system configuration
   */
  public getEnergyConfig(): EnergyConfig {
    return { ...this.config.energy };
  }

  /**
   * Get goal configuration
   */
  public getGoalConfig(): GoalConfig {
    return { ...this.config.goal };
  }

  /**
   * Get wave system configuration
   */
  public getWaveSystemConfig(): WaveSystemConfig {
    return { ...this.config.waveSystem };
  }

  /**
   * Get energy crystal configuration
   */
  public getEnergyCrystalConfig(): EnergyCrystalConfig {
    return { ...this.config.energyCrystal };
  }

  /**
   * Get enemy types configuration
   */
  public getEnemyTypesConfig(): Record<string, EnemyTypeConfig> {
    return { ...this.config.enemyTypes };
  }

  /**
   * Get towers configuration
   */
  public getTowersConfig(): Record<string, TowerConfig> {
    return { ...this.config.towers };
  }

  /**
   * Get specific tower configuration
   */
  public getTowerConfig(towerType: string): TowerConfig | null {
    return this.config.towers[towerType]
      ? { ...this.config.towers[towerType] }
      : null;
  }

  /**
   * Get wave configurations
   */
  public getWavesConfig(): Wave[] {
    return [...this.config.waves];
  }

  /**
   * Get skip tutorial setting
   */
  public getSkipTutorial(): boolean {
    return this.config.skipTutorial;
  }

  /**
   * Update player configuration
   */
  public updatePlayerConfig(updates: Partial<PlayerConfig>): void {
    this.config.player = { ...this.config.player, ...updates };
    console.log("Player config updated:", this.config.player);
  }

  /**
   * Update energy configuration
   */
  public updateEnergyConfig(updates: Partial<EnergyConfig>): void {
    this.config.energy = { ...this.config.energy, ...updates };
    console.log("Energy config updated:", this.config.energy);
  }

  /**
   * Update goal configuration
   */
  public updateGoalConfig(updates: Partial<GoalConfig>): void {
    this.config.goal = { ...this.config.goal, ...updates };
    console.log("Goal config updated:", this.config.goal);
  }

  /**
   * Update wave system configuration
   */
  public updateWaveSystemConfig(updates: Partial<WaveSystemConfig>): void {
    this.config.waveSystem = { ...this.config.waveSystem, ...updates };
    console.log("Wave system config updated:", this.config.waveSystem);
  }

  /**
   * Update energy crystal configuration
   */
  public updateEnergyCrystalConfig(
    updates: Partial<EnergyCrystalConfig>
  ): void {
    this.config.energyCrystal = { ...this.config.energyCrystal, ...updates };
    console.log("Energy crystal config updated:", this.config.energyCrystal);
  }

  /**
   * Update skip tutorial setting
   */
  public updateSkipTutorial(skipTutorial: boolean): void {
    this.config.skipTutorial = skipTutorial;
    console.log("Skip tutorial setting updated:", skipTutorial);
  }

  /**
   * Update enemy type configuration
   */
  public updateEnemyTypeConfig(
    enemyType: string,
    updates: Partial<EnemyTypeConfig>
  ): void {
    if (this.config.enemyTypes[enemyType]) {
      this.config.enemyTypes[enemyType] = {
        ...this.config.enemyTypes[enemyType],
        ...updates,
      };
      console.log(
        `Enemy type ${enemyType} config updated:`,
        this.config.enemyTypes[enemyType]
      );
    } else {
      console.warn(`Enemy type ${enemyType} not found in configuration`);
    }
  }

  /**
   * Get default configuration with values extracted from current codebase
   */
  private getDefaultConfig(): GameConfig {
    return {
      version: 1,
      skipTutorial: false,
      rewindRecordingInterval: 4,
      player: {
        speed: 200,
      },
      energy: {
        maxEnergy: 500,
        regenerationRate: 50,
        initialEnergy: 300,
        rewindCostPerTick: 0.2,
      },
      goal: {
        maxHP: 100,
        initialHP: 100,
        attackDamage: 5,
        attackInterval: 1000,
        collisionRadius: 30,
      },
      waveSystem: {
        waveStartDelay: 2000,
        overlayDisplayDuration: 2000,
      },
      energyCrystal: {
        energyValue: 10,
        lifetimeDuration: 8000,
        warningDuration: 4000,
      },
      enemyTypes: {
        BASIC: {
          name: "Basic",
          speed: 60,
          maxHp: 4,
          tintColor: 16777215,
        },
        FAST: {
          name: "Fast",
          speed: 100,
          maxHp: 2,
          tintColor: 6750054,
        },
        TANK: {
          name: "Tank",
          speed: 40,
          maxHp: 10,
          tintColor: 16737894,
        },
        BOSS: {
          name: "Boss",
          speed: 20,
          maxHp: 250,
          boss: true,
          tintColor: 11534591,
        },
      },
      towers: {
        basic_tower: {
          name: "Basic Turret",
          energyCost: 200,
          texture: "tower1",
          description: "A basic defensive turret",
          range: 100,
          damage: 1,
          shootingInterval: 1000,
          bulletSpeed: 500,
        },
        sniper_tower: {
          name: "Sniper Turret",
          energyCost: 300,
          texture: "tower2",
          description:
            "Long range turret with high bullet speed but slow firing rate",
          range: 200,
          damage: 2,
          shootingInterval: 2000,
          bulletSpeed: 1000,
        },
        slowdown_tower: {
          name: "Slowdown Turret",
          energyCost: 300,
          texture: "tower3",
          description: "Applies slow effect to enemies in range",
          range: 80,
          damage: 0,
          shootingInterval: 0,
          effectInterval: 2500,
          effectRadius: 80,
          slowAmount: 0.5,
          slowDuration: 2500,
        },
        splash_tower: {
          name: "Splash Turret",
          energyCost: 350,
          texture: "tower4",
          description:
            "Fires area-of-effect blasts that damage all enemies in radius",
          range: 60,
          damage: 1,
          shootingInterval: 3500,
          effectRadius: 60,
        },
      },
      waves: [
        {
          name: "First Contact",
          enemies: [
            {
              type: "BASIC",
              amount: 3,
              interval: 2500,
              delay: 1000,
            },
          ],
        },
        {
          name: "Second Contact",
          enemies: [
            {
              type: "BASIC",
              amount: 5,
              interval: 1500,
              delay: 3000,
            },
            {
              type: "BASIC",
              amount: 5,
              interval: 1200,
              delay: 20000,
            },
          ],
        },
        {
          name: "Growing Threat",
          enemies: [
            {
              type: "BASIC",
              amount: 5,
              interval: 800,
              delay: 2000,
            },
            {
              type: "FAST",
              amount: 4,
              interval: 2000,
              delay: 10000,
            },
            {
              type: "BASIC",
              amount: 6,
              interval: 2000,
              delay: 20000,
            },
            {
              type: "FAST",
              amount: 5,
              interval: 2000,
              delay: 28000,
            },
          ],
        },
        {
          name: "Full Assault",
          enemies: [
            {
              type: "BASIC",
              amount: 10,
              interval: 600,
              delay: 2000,
            },
            {
              type: "FAST",
              amount: 8,
              interval: 1500,
              delay: 8000,
            },
            {
              type: "TANK",
              amount: 3,
              interval: 3500,
              delay: 16000,
            },
          ],
        },
        {
          name: "Armored Division",
          enemies: [
            {
              type: "BASIC",
              amount: 10,
              interval: 2000,
              delay: 2000,
            },
            {
              type: "TANK",
              amount: 3,
              interval: 2500,
              delay: 3000,
            },
          ],
        },
        {
          name: "Lightning Strike",
          enemies: [
            {
              type: "FAST",
              amount: 10,
              interval: 800,
              delay: 2000,
            },
            {
              type: "FAST",
              amount: 10,
              interval: 1200,
              delay: 6000,
            },
          ],
        },
        {
          name: "Hard 1",
          enemies: [
            {
              type: "TANK",
              amount: 7,
              interval: 2000,
              delay: 2000,
            },
            {
              type: "FAST",
              amount: 15,
              interval: 1400,
              delay: 4000,
              energyDropRate: 0.5,
            },
            {
              type: "BASIC",
              amount: 15,
              interval: 500,
              delay: 12000,
              energyDropRate: 0.5,
            },
          ],
        },
        {
          name: "Hard 2",
          enemies: [
            {
              type: "FAST",
              amount: 20,
              interval: 200,
              delay: 2000,
              energyDropRate: 0.5,
            },
            {
              type: "FAST",
              amount: 20,
              interval: 400,
              delay: 4000,
              energyDropRate: 0.5,
            },
          ],
        },
        {
          name: "Hard 3",
          enemies: [
            {
              type: "TANK",
              amount: 20,
              interval: 2000,
              delay: 2000,
              energyDropRate: 0.5,
            },
            {
              type: "BASIC",
              amount: 22,
              interval: 1200,
              delay: 6000,
              energyDropRate: 0.5,
            },
          ],
        },
        {
          name: "Final",
          enemies: [
            {
              type: "BASIC",
              amount: 30,
              interval: 50,
              delay: 2000,
              energyDropRate: 0.3,
            },
            {
              type: "TANK",
              amount: 25,
              interval: 1500,
              delay: 3000,
              energyDropRate: 0.3,
            },
            {
              type: "BASIC",
              amount: 30,
              interval: 200,
              delay: 6000,
              energyDropRate: 0.3,
            },
            {
              type: "FAST",
              amount: 40,
              interval: 400,
              delay: 16000,
              energyDropRate: 0.3,
            },
            {
              type: "FAST",
              amount: 40,
              interval: 450,
              delay: 16000,
              energyDropRate: 0.3,
            },
          ],
        },
        {
          name: "Final Boss",
          enemies: [
            {
              type: "BOSS",
              amount: 1,
              interval: 50,
              delay: 4000,
              energyDropRate: 0.1,
            },
          ],
        },
      ],
    };
  }

  /**
   * Migrate configuration from older versions
   */
  private migrateConfig(config: Partial<GameConfig>): Partial<GameConfig> {
    const currentVersion = this.getDefaultConfig().version;
    const configVersion = config.version || 0;

    if (configVersion >= currentVersion) {
      return config; // No migration needed
    }

    console.log(
      `Migrating config from version ${configVersion} to ${currentVersion}`
    );

    // Create a copy to avoid modifying the original
    const migratedConfig = { ...config };

    // Migration from version 0 to 1: Add towers configuration
    if (configVersion < 1) {
      migratedConfig.version = 1;
      // Add towers config if missing - will be merged with defaults
      if (!migratedConfig.towers) {
        migratedConfig.towers = {};
      }
    }

    return migratedConfig;
  }

  /**
   * Deep merge configuration objects
   */
  private mergeConfig(
    base: GameConfig,
    override: Partial<GameConfig>
  ): GameConfig {
    const result = { ...base };

    for (const key in override) {
      const value = override[key as keyof GameConfig];
      if (value !== undefined) {
        if (
          typeof value === "object" &&
          !Array.isArray(value) &&
          value !== null
        ) {
          // Handle object merging with proper typing
          const baseValue = result[key as keyof GameConfig];
          if (
            typeof baseValue === "object" &&
            !Array.isArray(baseValue) &&
            baseValue !== null
          ) {
            (result as any)[key] = {
              ...baseValue,
              ...value,
            };
          } else {
            (result as any)[key] = value;
          }
        } else {
          (result as any)[key] = value;
        }
      }
    }

    return result;
  }

  /**
   * Reset configuration to defaults
   */
  public resetToDefaults(): void {
    this.config = this.getDefaultConfig();
    console.log("Configuration reset to defaults");
  }

  /**
   * Export configuration as JSON string
   */
  public exportConfig(): string {
    return JSON.stringify(this.config, null, 2);
  }

  /**
   * Import configuration from JSON string
   */
  public importConfig(configJson: string): boolean {
    try {
      const importedConfig = JSON.parse(configJson);
      this.config = this.mergeConfig(this.getDefaultConfig(), importedConfig);
      console.log("Configuration imported successfully");
      return true;
    } catch (error) {
      console.error("Failed to import configuration:", error);
      return false;
    }
  }

  /**
   * Load saved configuration from localStorage
   */
  private loadSavedConfig(): Partial<GameConfig> | null {
    try {
      const saved = localStorage.getItem("towerOfTimeConfig");
      if (saved) {
        return JSON.parse(saved);
      }
    } catch (error) {
      console.error("Failed to load saved configuration:", error);
    }
    return null;
  }

  /**
   * Save current configuration to localStorage
   */
  public saveToLocalStorage(): boolean {
    try {
      const configJson = this.exportConfig();
      localStorage.setItem("towerOfTimeConfig", configJson);
      console.log("Configuration saved to localStorage");
      return true;
    } catch (error) {
      console.error("Failed to save configuration to localStorage:", error);
      return false;
    }
  }

  /**
   * Clear saved configuration from localStorage
   */
  public clearSavedConfig(): void {
    localStorage.removeItem("towerOfTimeConfig");
    console.log("Saved configuration cleared from localStorage");
  }

  /**
   * Check if there is a saved configuration
   */
  public hasSavedConfig(): boolean {
    return localStorage.getItem("towerOfTimeConfig") !== null;
  }
}