/**
 * WIA-AI-011: AI Chip Interface Standard
 * TypeScript SDK
 *
 * 弘益人間 (홍익인간) · Benefit All Humanity
 *
 * @packageDocumentation
 */

export * from './types';

import {
  Device,
  DeviceType,
  DeviceInfo,
  DeviceCapabilities,
  Context,
  ContextConfig,
  Stream,
  StreamType,
  Event,
  Buffer,
  MemoryDescriptor,
  Tensor,
  TensorDescriptor,
  MatMulConfig,
  Conv2DConfig,
  SoftmaxConfig,
  Communicator,
  CollectiveConfig,
  ProfilingConfig,
  ProfileResults,
  Status,
  ErrorInfo,
} from './types';

/**
 * WIA Runtime - Main entry point for WIA-AI-011 operations
 */
export class WIARuntime {
  private static instance: WIARuntime | null = null;

  private constructor() {
    // Initialize native bindings
  }

  /**
   * Get singleton instance of WIA Runtime
   */
  static getInstance(): WIARuntime {
    if (!WIARuntime.instance) {
      WIARuntime.instance = new WIARuntime();
    }
    return WIARuntime.instance;
  }

  /**
   * Enumerate all WIA-compatible devices
   */
  async enumerateDevices(): Promise<Device[]> {
    // TODO: Implement native binding
    throw new Error('Not implemented - requires native binding');
  }

  /**
   * Get device by ID and type
   */
  async getDevice(id: number, type: DeviceType): Promise<Device> {
    // TODO: Implement native binding
    throw new Error('Not implemented - requires native binding');
  }

  /**
   * Get current active device
   */
  async getCurrentDevice(): Promise<Device> {
    // TODO: Implement native binding
    throw new Error('Not implemented - requires native binding');
  }

  /**
   * Set current active device
   */
  async setCurrentDevice(device: Device): Promise<void> {
    // TODO: Implement native binding
    throw new Error('Not implemented - requires native binding');
  }

  /**
   * Get version of WIA-AI-011 implementation
   */
  getVersion(): string {
    return '1.0.0';
  }
}

/**
 * Device implementation
 */
export class WIADevice implements Device {
  constructor(
    public readonly id: number,
    public readonly type: DeviceType
  ) {}

  async getInfo(): Promise<DeviceInfo> {
    // TODO: Implement native binding
    throw new Error('Not implemented - requires native binding');
  }

  async getCapabilities(): Promise<DeviceCapabilities> {
    // TODO: Implement native binding
    throw new Error('Not implemented - requires native binding');
  }

  async createContext(config: ContextConfig): Promise<Context> {
    return new WIAContext(config);
  }

  async allocateMemory(descriptor: MemoryDescriptor): Promise<Buffer> {
    // TODO: Implement native binding
    throw new Error('Not implemented - requires native binding');
  }

  async createTensor(descriptor: TensorDescriptor): Promise<Tensor> {
    // TODO: Implement native binding
    throw new Error('Not implemented - requires native binding');
  }
}

/**
 * Context implementation
 */
export class WIAContext implements Context {
  constructor(public readonly config: ContextConfig) {}

  async synchronize(): Promise<void> {
    // TODO: Implement native binding
    throw new Error('Not implemented - requires native binding');
  }

  async destroy(): Promise<void> {
    // TODO: Implement native binding
    throw new Error('Not implemented - requires native binding');
  }

  async createStream(type: StreamType): Promise<Stream> {
    return new WIAStream(type);
  }

  async createEvent(): Promise<Event> {
    return new WIAEvent();
  }

  async matmul(
    A: Tensor,
    B: Tensor,
    C: Tensor,
    config: MatMulConfig,
    stream?: Stream
  ): Promise<void> {
    // TODO: Implement native binding
    throw new Error('Not implemented - requires native binding');
  }

  async conv2d(
    input: Tensor,
    weight: Tensor,
    bias: Tensor | null,
    output: Tensor,
    config: Conv2DConfig,
    stream?: Stream
  ): Promise<void> {
    // TODO: Implement native binding
    throw new Error('Not implemented - requires native binding');
  }

  async relu(input: Tensor, output: Tensor, stream?: Stream): Promise<void> {
    // TODO: Implement native binding
    throw new Error('Not implemented - requires native binding');
  }

  async softmax(input: Tensor, output: Tensor, config: SoftmaxConfig, stream?: Stream): Promise<void> {
    // TODO: Implement native binding
    throw new Error('Not implemented - requires native binding');
  }

  async startProfiling(config: ProfilingConfig): Promise<void> {
    // TODO: Implement native binding
    throw new Error('Not implemented - requires native binding');
  }

  async stopProfiling(): Promise<void> {
    // TODO: Implement native binding
    throw new Error('Not implemented - requires native binding');
  }

  async getProfileResults(): Promise<ProfileResults> {
    // TODO: Implement native binding
    throw new Error('Not implemented - requires native binding');
  }
}

/**
 * Stream implementation
 */
export class WIAStream implements Stream {
  constructor(public readonly type: StreamType) {}

  async synchronize(): Promise<void> {
    // TODO: Implement native binding
    throw new Error('Not implemented - requires native binding');
  }

  async query(): Promise<boolean> {
    // TODO: Implement native binding
    throw new Error('Not implemented - requires native binding');
  }

  async destroy(): Promise<void> {
    // TODO: Implement native binding
    throw new Error('Not implemented - requires native binding');
  }
}

/**
 * Event implementation
 */
export class WIAEvent implements Event {
  async record(stream: Stream): Promise<void> {
    // TODO: Implement native binding
    throw new Error('Not implemented - requires native binding');
  }

  async synchronize(): Promise<void> {
    // TODO: Implement native binding
    throw new Error('Not implemented - requires native binding');
  }

  async destroy(): Promise<void> {
    // TODO: Implement native binding
    throw new Error('Not implemented - requires native binding');
  }
}

/**
 * Communicator implementation for multi-device operations
 */
export class WIACommunicator implements Communicator {
  constructor(
    public readonly devices: Device[],
    public readonly rank: number
  ) {}

  get num_devices(): number {
    return this.devices.length;
  }

  async allReduce(
    sendBuffer: Buffer,
    recvBuffer: Buffer,
    count: number,
    config: CollectiveConfig,
    stream?: Stream
  ): Promise<void> {
    // TODO: Implement native binding
    throw new Error('Not implemented - requires native binding');
  }

  async broadcast(
    buffer: Buffer,
    count: number,
    root: number,
    datatype: string,
    stream?: Stream
  ): Promise<void> {
    // TODO: Implement native binding
    throw new Error('Not implemented - requires native binding');
  }

  async allGather(
    sendBuffer: Buffer,
    recvBuffer: Buffer,
    count: number,
    datatype: string,
    stream?: Stream
  ): Promise<void> {
    // TODO: Implement native binding
    throw new Error('Not implemented - requires native binding');
  }

  async barrier(stream?: Stream): Promise<void> {
    // TODO: Implement native binding
    throw new Error('Not implemented - requires native binding');
  }

  async synchronize(): Promise<void> {
    // TODO: Implement native binding
    throw new Error('Not implemented - requires native binding');
  }

  async destroy(): Promise<void> {
    // TODO: Implement native binding
    throw new Error('Not implemented - requires native binding');
  }
}

/**
 * Utility functions
 */
export class WIAUtils {
  /**
   * Calculate tensor size in bytes
   */
  static calculateTensorSize(descriptor: TensorDescriptor): number {
    const shape = descriptor.shape.dimensions as number[];
    const elements = shape.reduce((a, b) => a * b, 1);
    const bytesPerElement = this.getBytesPerElement(descriptor.dtype.base_type);
    return elements * bytesPerElement;
  }

  /**
   * Get bytes per element for data type
   */
  static getBytesPerElement(dtype: string): number {
    const sizeMap: Record<string, number> = {
      FLOAT64: 8,
      FLOAT32: 4,
      FLOAT16: 2,
      BFLOAT16: 2,
      TF32: 4,
      FP8_E4M3: 1,
      FP8_E5M2: 1,
      INT64: 8,
      INT32: 4,
      INT16: 2,
      INT8: 1,
      INT4: 0.5,
      UINT64: 8,
      UINT32: 4,
      UINT16: 2,
      UINT8: 1,
      UINT4: 0.5,
    };
    return sizeMap[dtype] || 4;
  }

  /**
   * Validate tensor descriptor
   */
  static validateTensorDescriptor(descriptor: TensorDescriptor): boolean {
    if (!descriptor.version.startsWith('WIA-AI-011')) {
      return false;
    }
    if (descriptor.shape.dimensions.length === 0) {
      return false;
    }
    if (descriptor.memory.alignment < 64) {
      return false;
    }
    return true;
  }
}

/**
 * Default export: WIARuntime instance
 */
export default WIARuntime.getInstance();