import { AppSettings } from './stores/appSettings';
import {
  STORAGE_KEYS,
  PERFORMANCE,
  DEFAULTS,
  ValueMode,
} from './utils/constants';

export interface SavedShader {
  id: string;
  name: string;
  code: string;
  created: number;
  lastUsed: number;
  // Visual settings
  resolution?: number;
  fps?: number;
  renderMode?: string;
  valueMode?: ValueMode;
  uiOpacity?: number;
  hueShift?: number;
}

export class Storage {
  private static readonly SHADERS_KEY = STORAGE_KEYS.SHADERS;
  private static readonly SETTINGS_KEY = STORAGE_KEYS.SETTINGS;

  static saveShader(
    name: string,
    code: string,
    settings?: Partial<AppSettings>
  ): SavedShader {
    const shaders = this.getShaders();
    const id = this.generateId();
    const timestamp = Date.now();

    const shader: SavedShader = {
      id,
      name: name.trim() || `Shader ${shaders.length + 1}`,
      code,
      created: timestamp,
      lastUsed: timestamp,
      // Include settings if provided
      ...(settings && {
        resolution: settings.resolution,
        fps: settings.fps,
        renderMode: settings.renderMode,
        valueMode: settings.valueMode,
        uiOpacity: settings.uiOpacity,
        hueShift: settings.hueShift,
      }),
    };

    shaders.push(shader);
    this.setShaders(shaders);
    return shader;
  }

  static getShaders(): SavedShader[] {
    try {
      const stored = localStorage.getItem(this.SHADERS_KEY);
      return stored ? JSON.parse(stored) : [];
    } catch (error) {
      console.error('Failed to load shaders:', error);
      return [];
    }
  }

  static deleteShader(id: string): void {
    const shaders = this.getShaders().filter((s) => s.id !== id);
    this.setShaders(shaders);
  }

  static updateShaderUsage(id: string): void {
    const shaders = this.getShaders();
    const shader = shaders.find((s) => s.id === id);
    if (shader) {
      shader.lastUsed = Date.now();
      this.setShaders(shaders);
    }
  }

  static renameShader(id: string, newName: string): void {
    const shaders = this.getShaders();
    const shader = shaders.find((s) => s.id === id);
    if (shader) {
      shader.name = newName.trim() || shader.name;
      this.setShaders(shaders);
    }
  }

  private static setShaders(shaders: SavedShader[]): void {
    try {
      // Keep only the most recent shaders
      const sortedShaders = shaders
        .sort((a, b) => b.lastUsed - a.lastUsed)
        .slice(0, PERFORMANCE.MAX_SAVED_SHADERS);
      localStorage.setItem(this.SHADERS_KEY, JSON.stringify(sortedShaders));
    } catch (error) {
      console.error('Failed to save shaders:', error);
    }
  }

  static saveSettings(settings: Partial<AppSettings>): void {
    try {
      const current = this.getSettings();
      const updated = { ...current, ...settings };
      localStorage.setItem(this.SETTINGS_KEY, JSON.stringify(updated));
    } catch (error) {
      console.error('Failed to save settings:', error);
    }
  }

  static getSettings(): AppSettings {
    try {
      const stored = localStorage.getItem(this.SETTINGS_KEY);
      const defaults: AppSettings = {
        resolution: DEFAULTS.RESOLUTION,
        fps: DEFAULTS.FPS,
        lastShaderCode: DEFAULTS.SHADER_CODE,
        renderMode: DEFAULTS.RENDER_MODE,
        valueMode: DEFAULTS.VALUE_MODE,
        uiOpacity: DEFAULTS.UI_OPACITY,
      };
      return stored ? { ...defaults, ...JSON.parse(stored) } : defaults;
    } catch (error) {
      console.error('Failed to load settings:', error);
      return {
        resolution: DEFAULTS.RESOLUTION,
        fps: DEFAULTS.FPS,
        lastShaderCode: DEFAULTS.SHADER_CODE,
        renderMode: DEFAULTS.RENDER_MODE,
        valueMode: DEFAULTS.VALUE_MODE,
        uiOpacity: DEFAULTS.UI_OPACITY,
      };
    }
  }

  static clearAll(): void {
    try {
      localStorage.removeItem(this.SHADERS_KEY);
      localStorage.removeItem(this.SETTINGS_KEY);
    } catch (error) {
      console.error('Failed to clear storage:', error);
    }
  }

  private static generateId(): string {
    return Date.now().toString(36) + Math.random().toString(36).substr(2);
  }

  static exportShaders(): string {
    const shaders = this.getShaders();
    return JSON.stringify(shaders, null, 2);
  }

  static importShaders(jsonData: string): boolean {
    try {
      const imported = JSON.parse(jsonData) as SavedShader[];
      if (!Array.isArray(imported)) {
        return false;
      }

      // Validate structure
      const valid = imported.every(
        (shader) =>
          shader.id &&
          shader.name &&
          shader.code &&
          typeof shader.created === 'number' &&
          typeof shader.lastUsed === 'number'
      );

      if (!valid) {
        return false;
      }

      const existing = this.getShaders();
      const merged = [...existing, ...imported];
      this.setShaders(merged);
      return true;
    } catch (error) {
      console.error('Failed to import shaders:', error);
      return false;
    }
  }
}