import { Logger } from '@nestjs/common';
import { AxiosError } from 'axios';
import { InquiryType } from '../../common/enums/inquiry-type.enum';
import { ProviderName } from '../../common/enums/provider-name.enum';
import { NormalizedErrorDto } from '../../common/dto/normalized-error.dto';
import {
  InquiryProvider,
  ProviderExecutionContext,
} from '../../common/interfaces/inquiry-provider.interface';
import { withRetry } from '../../common/helpers/retry.helper';
import { withTimeout } from '../../common/helpers/timeout.helper';
import { RequestLogger } from '../../common/helpers/request-logger.helper';
import { ProviderConfigSlice } from '../interfaces/provider-config.interface';

/**
 * Abstract base for all provider adapters.
 *
 * Responsibilities:
 * - Retry + timeout orchestration
 * - Standardized error normalization
 * - Response formatting hooks
 * - Structured logging
 *
 * Subclasses implement provider-specific HTTP/business logic only.
 */
export abstract class BaseProvider<TRequest = unknown, TResponse = unknown>
  implements InquiryProvider<TRequest, TResponse>
{
  abstract readonly name: ProviderName;
  abstract readonly supportedInquiryTypes: InquiryType[];

  protected readonly logger: RequestLogger;
  protected readonly nestLogger: Logger;

  constructor(protected readonly config: ProviderConfigSlice) {
    this.logger = new RequestLogger(this.constructor.name);
    this.nestLogger = new Logger(this.constructor.name);
  }

  isEnabled(): boolean {
    return this.config.enabled;
  }

  async execute(
    inquiryType: InquiryType,
    payload: TRequest,
    context: ProviderExecutionContext,
  ): Promise<TResponse> {
    if (!this.supportedInquiryTypes.includes(inquiryType)) {
      throw this.normalizeError({
        code: 'UNSUPPORTED_INQUIRY',
        message: `Provider ${this.name} does not support ${inquiryType}`,
      });
    }

    const start = Date.now();
    this.logger.logStart(
      {
        requestId: context.requestId,
        trackingCode: context.trackingCode,
        provider: this.name,
        inquiryType,
      },
      'Provider execution started',
    );

    try {
      const result = await this.executeWithResilience(
        () => this.callProvider(inquiryType, payload, context),
        context,
      );

      this.logger.logSuccess(
        {
          requestId: context.requestId,
          trackingCode: context.trackingCode,
          provider: this.name,
          inquiryType,
          durationMs: Date.now() - start,
        },
        'Provider execution succeeded',
      );

      return result;
    } catch (error) {
      this.logger.logFailure(
        {
          requestId: context.requestId,
          trackingCode: context.trackingCode,
          provider: this.name,
          inquiryType,
          durationMs: Date.now() - start,
        },
        'Provider execution failed',
        error,
      );
      throw error;
    }
  }

  protected async executeWithResilience<T>(
    fn: () => Promise<T>,
    context: ProviderExecutionContext,
  ): Promise<T> {
    const operation = () =>
      withTimeout(fn(), this.config.timeout, `${this.name} request`);

    return withRetry(operation, {
      maxAttempts: this.config.maxRetries,
      delayMs: 300,
      shouldRetry: (error) => this.isRetryable(error),
    });
  }

  protected isRetryable(error: unknown): boolean {
    if (error && typeof error === 'object' && 'code' in error) {
      const code = (error as { code?: string }).code;
      return code === 'ETIMEDOUT' || code === 'ECONNABORTED' || code === 'ECONNRESET';
    }
    return false;
  }

  protected normalizeError(partial: Partial<NormalizedErrorDto>): NormalizedErrorDto {
    return {
      code: partial.code ?? 'PROVIDER_ERROR',
      message: partial.message ?? 'Provider request failed',
      providerMessage: partial.providerMessage,
      providerCode: partial.providerCode,
      providerTrackingCode: partial.providerTrackingCode,
      details: partial.details,
      conflict: partial.conflict,
    };
  }

  protected formatProviderError(
    providerMessage?: string,
    providerCode?: string,
    fallbackMessage = 'Provider request failed',
    extras?: Pick<NormalizedErrorDto, 'providerTrackingCode' | 'details' | 'conflict'>,
  ): Error {
    const message = providerMessage?.trim() || fallbackMessage;
    const code = providerCode?.trim() || 'PROVIDER_ERROR';
    const normalized = this.normalizeError({
      code,
      message,
      providerMessage: message,
      providerCode: code,
      ...extras,
    });
    const err = new Error(message);
    (err as Error & { normalizedError: NormalizedErrorDto }).normalizedError = normalized;
    return err;
  }

  protected formatAxiosError(error: AxiosError): Error {
    const data = error.response?.data;
    if (typeof data === 'string') {
      const faultMatch = data.match(
        /<(?:\w+:)?faultstring[^>]*>([\s\S]*?)<\/(?:\w+:)?faultstring>/i,
      );
      if (faultMatch?.[1]) {
        return this.formatProviderError(
          faultMatch[1].trim().replace(/&amp;/g, '&').replace(/&lt;/g, '<').replace(/&gt;/g, '>'),
          String(error.response?.status ?? 'NETWORK_ERROR'),
        );
      }
    }

    return this.formatProviderError(
      error.message,
      String(error.response?.status ?? 'NETWORK_ERROR'),
    );
  }

  protected abstract callProvider(
    inquiryType: InquiryType,
    payload: TRequest,
    context: ProviderExecutionContext,
  ): Promise<TResponse>;
}