import * as plugins from './smartenv.plugins.js';
import * as interfaces from './interfaces/index.js';

// interfaces
export interface IEnvObject {
  name: string;
  value: string;
}

/**
 * Smartenv class that makes it easy
 */
export class Smartenv {
  public async getEnvAwareModule(optionsArg: {
    nodeModuleName: string;
    webUrlArg: string;
    getFunction: () => any;
  }) {
    if (this.isNode) {
      const moduleResult = await this.getSafeNodeModule(optionsArg.nodeModuleName);
      return moduleResult;
    } else if (this.isBrowser) {
      const moduleResult = await this.getSafeWebModule(
        optionsArg.webUrlArg,
        optionsArg.getFunction
      );
      return moduleResult;
    } else {
      console.error('platform for loading not supported by smartenv');
    }
  }

  public async getSafeNodeModule<T = any>(moduleNameArg: string, runAfterFunc?: (moduleArg: T) => Promise<any>): Promise<T> {
    if (!this.isNode && !this.isDeno && !this.isBun) {
      console.error(`You tried to load a server module in a wrong context: ${moduleNameArg}. This does not throw.`);
      return;
    }
    // tslint:disable-next-line: function-constructor
    const returnValue: T = await (new Function(`return import('${moduleNameArg}')`)() as Promise<T>);
    if (runAfterFunc) {
      await runAfterFunc(returnValue);
    }
    return returnValue;
  }

  public loadedScripts: string[] = [];
  public async getSafeWebModule(urlArg: string, getFunctionArg: () => any) {
    if (!this.isBrowser) {
      console.error('You tried to load a web module in a wrong context');
      return;
    }

    if (this.loadedScripts.includes(urlArg)) {
      return getFunctionArg();
    } else {
      this.loadedScripts.push(urlArg);
    }

    const done = plugins.smartpromise.defer();
    if (globalThis.importScripts) {
      globalThis.importScripts(urlArg);
      done.resolve();
    } else {
      const script = document.createElement('script');
      script.onload = () => {
        done.resolve();
      };
      script.src = urlArg;
      document.head.appendChild(script);
    }
    await done.promise;
    return getFunctionArg();
  }

  public get runtimeEnv(): interfaces.TRuntimeType {
    // Check Deno first (most distinctive)
    if (typeof globalThis.Deno !== 'undefined' &&
        typeof (globalThis as any).Deno?.version !== 'undefined') {
      return 'deno';
    }

    // Check Bun second (most distinctive)
    if (typeof globalThis.Bun !== 'undefined' &&
        typeof (globalThis as any).Bun?.version !== 'undefined') {
      return 'bun';
    }

    // Check Node.js (be explicit about versions to avoid Deno/Bun false positives)
    if (typeof globalThis.process !== 'undefined' &&
        typeof (globalThis as any).process?.versions?.node !== 'undefined') {
      return 'node';
    }

    // Check Browser (default fallback)
    if (typeof globalThis.window !== 'undefined' &&
        typeof (globalThis as any).document !== 'undefined') {
      return 'browser';
    }

    // Safe fallback
    return 'browser';
  }

  public get isBrowser(): boolean {
    return this.runtimeEnv === 'browser';
  }

  public get isNode(): boolean {
    return this.runtimeEnv === 'node';
  }

  public get isDeno(): boolean {
    return this.runtimeEnv === 'deno';
  }

  public get isBun(): boolean {
    return this.runtimeEnv === 'bun';
  }

  public get userAgent(): string {
    if (this.isBrowser) {
      // make sure we are in Browser
      return navigator.userAgent;
    } else {
      return 'undefined';
    }
  }

  public get nodeVersion(): string {
    if (this.isNode) {
      return process.version;
    }
    return 'undefined';
  }

  public get denoVersion(): string {
    if (this.isDeno) {
      return (globalThis as any).Deno.version.deno;
    }
    return 'undefined';
  }

  public get bunVersion(): string {
    if (this.isBun) {
      return (globalThis as any).Bun.version;
    }
    return 'undefined';
  }

  /**
   * Load a module only if the current runtime matches the target runtime(s)
   * @param target - Single runtime, array of runtimes, or 'server' for all server-side runtimes
   * @param moduleNameOrUrl - Module name (for Node/Deno/Bun) or URL (for browser)
   * @param getFunction - Optional function to retrieve the module in browser context
   * @returns The loaded module or undefined if runtime doesn't match
   */
  public async getSafeModuleFor<T = any>(
    target: interfaces.TRuntimeTarget | interfaces.TRuntimeTarget[],
    moduleNameOrUrl: string,
    getFunction?: () => any
  ): Promise<T | undefined> {
    // Normalize target to array
    let targetRuntimes: interfaces.TRuntimeType[];

    if (Array.isArray(target)) {
      // Expand 'server' if present in array
      targetRuntimes = target.flatMap(t =>
        t === 'server' ? ['node', 'deno', 'bun'] as interfaces.TRuntimeType[] : [t as interfaces.TRuntimeType]
      );
    } else if (target === 'server') {
      targetRuntimes = ['node', 'deno', 'bun'];
    } else {
      targetRuntimes = [target];
    }

    // Check if current runtime matches any target
    if (!targetRuntimes.includes(this.runtimeEnv)) {
      console.warn(
        `Module "${moduleNameOrUrl}" requested for runtime(s) [${targetRuntimes.join(', ')}] ` +
        `but current runtime is "${this.runtimeEnv}". Skipping load.`
      );
      return undefined;
    }

    // Load based on current runtime
    if (this.isNode || this.isDeno || this.isBun) {
      // Server-side runtimes use dynamic import
      const moduleResult = await this.getSafeNodeModule<T>(moduleNameOrUrl);
      return moduleResult;
    } else if (this.isBrowser) {
      if (!getFunction) {
        console.error(`Browser module load requires getFunction parameter for "${moduleNameOrUrl}"`);
        return undefined;
      }
      const moduleResult = await this.getSafeWebModule(moduleNameOrUrl, getFunction);
      return moduleResult as T;
    }

    return undefined;
  }

  public get isCI(): boolean {
    if (this.isNode) {
      if (process.env.CI) {
        return true;
      } else {
        return false;
      }
    } else {
      return false;
    }
  }

  public async isMacAsync(): Promise<boolean> {
    if (this.isNode) {
      const os = await this.getSafeNodeModule('os');
      return os.platform() === 'darwin';
    } else {
      return false;
    }
  }

  public async isWindowsAsync(): Promise<boolean> {
    if (this.isNode) {
      const os = await this.getSafeNodeModule('os');
      return os.platform() === 'win32';
    } else {
      return false;
    }
  }

  public async isLinuxAsync(): Promise<boolean> {
    if (this.isNode) {
      const os = await this.getSafeNodeModule('os');
      return os.platform() === 'linux';
    } else {
      return false;
    }
  }

  /**
   * prints the environment to console
   */
  public async printEnv() {
    if (this.isNode) {
      console.log('running on NODE');
      console.log('node version is ' + this.nodeVersion);
    } else if (this.isDeno) {
      console.log('running on DENO');
      console.log('deno version is ' + this.denoVersion);
    } else if (this.isBun) {
      console.log('running on BUN');
      console.log('bun version is ' + this.bunVersion);
    } else {
      console.log('running on BROWSER');
      console.log('browser is ' + this.userAgent);
    }
  }
}