import { ErrorCode, ErrorContext } from './types.js';

/**
 * Base error class for all Elasticsearch client errors
 *
 * @example
 * ```typescript
 * throw new ElasticsearchError('Connection failed', {
 *   code: ErrorCode.CONNECTION_FAILED,
 *   retryable: true,
 *   context: {
 *     timestamp: new Date(),
 *     operation: 'connect',
 *     statusCode: 503
 *   }
 * });
 * ```
 */
export class ElasticsearchError extends Error {
  /** Error code for categorization */
  public readonly code: ErrorCode;

  /** Whether this error is retryable */
  public readonly retryable: boolean;

  /** Additional context about the error */
  public readonly context: ErrorContext;

  constructor(
    message: string,
    options: {
      code: ErrorCode;
      retryable: boolean;
      context: ErrorContext;
      cause?: Error;
    }
  ) {
    super(message, { cause: options.cause });
    this.name = this.constructor.name;
    this.code = options.code;
    this.retryable = options.retryable;
    this.context = {
      ...options.context,
      timestamp: options.context.timestamp || new Date(),
    };

    // Maintains proper stack trace for where error was thrown (V8 only)
    if (Error.captureStackTrace) {
      Error.captureStackTrace(this, this.constructor);
    }
  }

  /**
   * Convert error to JSON for logging/serialization
   */
  toJSON(): Record<string, unknown> {
    return {
      name: this.name,
      message: this.message,
      code: this.code,
      retryable: this.retryable,
      context: this.context,
      stack: this.stack,
    };
  }

  /**
   * Check if error is of a specific code
   */
  is(code: ErrorCode): boolean {
    return this.code === code;
  }

  /**
   * Check if error is retryable
   */
  canRetry(): boolean {
    return this.retryable;
  }
}

/**
 * Connection-related errors
 */
export class ConnectionError extends ElasticsearchError {
  constructor(message: string, context: Partial<ErrorContext> = {}, cause?: Error) {
    super(message, {
      code: ErrorCode.CONNECTION_FAILED,
      retryable: true,
      context: {
        ...context,
        timestamp: new Date(),
      },
      cause,
    });
  }
}

/**
 * Timeout errors
 */
export class TimeoutError extends ElasticsearchError {
  constructor(
    message: string,
    operation: string,
    timeoutMs: number,
    context: Partial<ErrorContext> = {},
    cause?: Error
  ) {
    super(message, {
      code: ErrorCode.REQUEST_TIMEOUT,
      retryable: true,
      context: {
        ...context,
        operation,
        timeout: timeoutMs,
        timestamp: new Date(),
      },
      cause,
    });
  }
}

/**
 * Index not found error
 */
export class IndexNotFoundError extends ElasticsearchError {
  constructor(indexName: string, context: Partial<ErrorContext> = {}, cause?: Error) {
    super(`Index not found: ${indexName}`, {
      code: ErrorCode.INDEX_NOT_FOUND,
      retryable: false,
      context: {
        ...context,
        index: indexName,
        timestamp: new Date(),
      },
      cause,
    });
  }
}

/**
 * Document not found error
 */
export class DocumentNotFoundError extends ElasticsearchError {
  constructor(
    documentId: string,
    indexName?: string,
    context: Partial<ErrorContext> = {},
    cause?: Error
  ) {
    super(`Document not found: ${documentId}${indexName ? ` in index ${indexName}` : ''}`, {
      code: ErrorCode.DOCUMENT_NOT_FOUND,
      retryable: false,
      context: {
        ...context,
        documentId,
        index: indexName,
        timestamp: new Date(),
      },
      cause,
    });
  }
}

/**
 * Document conflict error (version mismatch, optimistic locking)
 */
export class DocumentConflictError extends ElasticsearchError {
  constructor(
    documentId: string,
    message: string,
    context: Partial<ErrorContext> = {},
    cause?: Error
  ) {
    super(message, {
      code: ErrorCode.DOCUMENT_CONFLICT,
      retryable: true, // Can retry with updated version
      context: {
        ...context,
        documentId,
        timestamp: new Date(),
      },
      cause,
    });
  }
}

/**
 * Authentication error
 */
export class AuthenticationError extends ElasticsearchError {
  constructor(message: string, context: Partial<ErrorContext> = {}, cause?: Error) {
    super(message, {
      code: ErrorCode.AUTHENTICATION_FAILED,
      retryable: false,
      context: {
        ...context,
        timestamp: new Date(),
      },
      cause,
    });
  }
}

/**
 * Authorization error (insufficient permissions)
 */
export class AuthorizationError extends ElasticsearchError {
  constructor(
    operation: string,
    resource: string,
    context: Partial<ErrorContext> = {},
    cause?: Error
  ) {
    super(`Not authorized to perform ${operation} on ${resource}`, {
      code: ErrorCode.AUTHORIZATION_FAILED,
      retryable: false,
      context: {
        ...context,
        operation,
        resource,
        timestamp: new Date(),
      },
      cause,
    });
  }
}

/**
 * Configuration error
 */
export class ConfigurationError extends ElasticsearchError {
  constructor(message: string, context: Partial<ErrorContext> = {}, cause?: Error) {
    super(message, {
      code: ErrorCode.INVALID_CONFIGURATION,
      retryable: false,
      context: {
        ...context,
        timestamp: new Date(),
      },
      cause,
    });
  }
}

/**
 * Query parsing error
 */
export class QueryParseError extends ElasticsearchError {
  constructor(query: unknown, reason: string, context: Partial<ErrorContext> = {}, cause?: Error) {
    super(`Failed to parse query: ${reason}`, {
      code: ErrorCode.QUERY_PARSE_ERROR,
      retryable: false,
      context: {
        ...context,
        query,
        timestamp: new Date(),
      },
      cause,
    });
  }
}

/**
 * Bulk operation error with partial failures
 */
export class BulkOperationError extends ElasticsearchError {
  public readonly successfulCount: number;
  public readonly failedCount: number;
  public readonly failures: Array<{
    documentId?: string;
    error: string;
    status: number;
  }>;

  constructor(
    message: string,
    successful: number,
    failed: number,
    failures: Array<{ documentId?: string; error: string; status: number }>,
    context: Partial<ErrorContext> = {},
    cause?: Error
  ) {
    super(message, {
      code: failed === 0 ? ErrorCode.BULK_REQUEST_FAILED : ErrorCode.PARTIAL_BULK_FAILURE,
      retryable: true, // Failed items can be retried
      context: {
        ...context,
        successfulCount: successful,
        failedCount: failed,
        timestamp: new Date(),
      },
      cause,
    });

    this.successfulCount = successful;
    this.failedCount = failed;
    this.failures = failures;
  }

  toJSON(): Record<string, unknown> {
    return {
      ...super.toJSON(),
      successfulCount: this.successfulCount,
      failedCount: this.failedCount,
      failures: this.failures,
    };
  }
}

/**
 * Cluster unavailable error
 */
export class ClusterUnavailableError extends ElasticsearchError {
  constructor(message: string, context: Partial<ErrorContext> = {}, cause?: Error) {
    super(message, {
      code: ErrorCode.CLUSTER_UNAVAILABLE,
      retryable: true,
      context: {
        ...context,
        timestamp: new Date(),
      },
      cause,
    });
  }
}