import { GlobalFunctions, TransferAreaProperties } from '@/GlobalFunctions';
import { apiService } from './api';

export interface TranscriptionResponse {
  success: boolean;
  transcription_id: string;
  audio_url: string;
  message: string;
}

export interface TranscriptionRecord {
  id: string;
  user_email: string;
  estabelecimento_id: number;
  audio_file_name: string;
  audio_duration_seconds: number;
  transcription_text: string;
  model: string;
  audio_url: string;
  cost_usd: string;
  created_at: string;
}

export interface TranscriptionRequest {
  audioFile: File;
  userEmail?: string;
  estabelecimentoId?: number;
}

type ApiErrorShape = { message?: string; status?: number };

class TranscriptionService {
  private readonly TRANSCRIPTION_ENDPOINT = '/webhook/codex/transcrever_audio';
  private readonly GET_TRANSCRIPTIONS_ENDPOINT = '/webhook/fd073ec0-81ab-4681-8acd-b0da71f6ad30/codex/get_transcrever_audio';
  private readonly DELETE_TRANSCRIPTION_ENDPOINT = '/webhook/fd073ec0-81ab-4681-8acd-b0da71f6ad30/codex/delete_transcrever_audio';

  private readonly SUPPORTED_FORMATS = ['flac', 'm4a', 'mp3', 'mp4', 'mpeg', 'mpga', 'oga', 'ogg', 'wav', 'webm'];

  private resolveEmail(userEmail?: string): string {
    return userEmail || GlobalFunctions.getTransferProperty(TransferAreaProperties.UsuarioEmail);
  }

  private toApiError(error: unknown, fallback: string): never {
    const e = error as ApiErrorShape;
    throw { success: false, message: e?.message || fallback, status: e?.status };
  }

  private extractArray<T>(data: unknown, keys: string[]): T[] {
    if (Array.isArray(data)) return data as T[];
    if (data && typeof data === 'object') {
      for (const key of keys) {
        const candidate = (data as Record<string, unknown>)[key];
        if (Array.isArray(candidate)) return candidate as T[];
      }
    }
    return [];
  }

  validateAudioFile(file: File, maxSizeMB = 25): { valid: boolean; error?: string } {
    const maxBytes = maxSizeMB * 1024 * 1024;
    if (file.size > maxBytes) {
      return { valid: false, error: `Arquivo muito grande. Tamanho máximo: ${maxSizeMB}MB` };
    }
    const ext = file.name.split('.').pop()?.toLowerCase();
    if (!ext || !this.SUPPORTED_FORMATS.includes(ext)) {
      return { valid: false, error: `Formato não suportado. Formatos aceitos: ${this.SUPPORTED_FORMATS.join(', ')}` };
    }
    return { valid: true };
  }

  async transcribeAudio(request: TranscriptionRequest): Promise<TranscriptionResponse> {
    const { audioFile } = request;

    const email = GlobalFunctions.getTransferProperty(TransferAreaProperties.UsuarioEmail);
    const estabId = GlobalFunctions.getTransferProperty(TransferAreaProperties.EstabelecimentoCodigo);

    const formData = new FormData();
    formData.append('data', audioFile);
    formData.append('user_email', email);
    formData.append('estabelecimento_id', estabId.toString());

    try {
      const response = await apiService.postFormData<TranscriptionResponse>(
        this.TRANSCRIPTION_ENDPOINT,
        formData
      );
      return response.data;
    } catch (error: unknown) {
      console.error('Erro na transcrição:', error);
      this.toApiError(error, 'Erro ao transcrever áudio');
    }
  }

  async getTranscriptions(userEmail?: string, page = 1, perPage = 10): Promise<TranscriptionRecord[]> {
    const email = this.resolveEmail(userEmail);
    if (!email) throw { success: false, message: 'Email do usuário não fornecido' };

    try {
      const response = await apiService.get<unknown>(
        `${this.GET_TRANSCRIPTIONS_ENDPOINT}/${email}`,
        { params: { page: page.toString(), per_page: perPage.toString() } }
      );
      return this.extractArray<TranscriptionRecord>(response.data, ['transcriptions', 'data']);
    } catch (error: unknown) {
      console.error('Erro ao buscar transcrições:', error);
      this.toApiError(error, 'Erro ao buscar transcrições');
    }
  }

  async deleteTranscription(transcriptionId: string, userEmail?: string): Promise<{ success: boolean; message?: string }> {
    const email = this.resolveEmail(userEmail);
    if (!email) throw { success: false, message: 'Email do usuário não fornecido' };
    if (!transcriptionId) throw { success: false, message: 'ID da transcrição não fornecido' };

    try {
      const response = await apiService.delete<{ success: boolean; message?: string } | Array<{ success: boolean; message?: string }>>(
        `${this.DELETE_TRANSCRIPTION_ENDPOINT}/${email}/${transcriptionId}`
      );
      const result = Array.isArray(response.data) ? response.data[0] : response.data;
      return { success: result.success ?? true, message: result.message || 'Transcrição deletada com sucesso' };
    } catch (error: unknown) {
      console.error('Erro ao deletar transcrição:', error);
      this.toApiError(error, 'Erro ao deletar transcrição');
    }
  }
}

export const transcriptionService = new TranscriptionService();