import { Injectable } from '@nestjs/common';
import { WhatsappTemplateRepository } from './repositories/whatsapp-template.repository';

@Injectable()
export class WhatsappTemplateService {
  constructor(private readonly whatsappTemplateRepository: WhatsappTemplateRepository) {}

  async getTemplates() {
    await this.whatsappTemplateRepository.refreshMetaApprovals();
    const result = await this.whatsappTemplateRepository.listTemplates();
    return result.rows;
  }

  async getTemplateById(id: number) {
    await this.whatsappTemplateRepository.refreshMetaApprovals();
    const result = await this.whatsappTemplateRepository.getTemplateById(id);
    return result.rows[0] || null;
  }

  async saveTemplate(name: string, content: string, areaId?: number | null, requestedByRole = 'admin', category = 'UTILITY') {
    const isSupervisor = requestedByRole === 'supervisor';
    const result = await this.whatsappTemplateRepository.saveTemplate({
      name,
      content,
      category: this.normalizeTemplateCategory(category),
      areaId,
      status: isSupervisor ? 'admin_review' : 'meta_review',
      requestedByRole,
      adminApprovedAtSql: isSupervisor ? 'NULL' : 'CURRENT_TIMESTAMP',
      metaSubmittedAtSql: isSupervisor ? 'NULL' : 'CURRENT_TIMESTAMP',
    });

    return result.rows[0];
  }

  async updateTemplate(id: number, name: string, content: string, areaId?: number | null, category = 'UTILITY') {
    const result = await this.whatsappTemplateRepository.updateTemplate(id, {
      name,
      content,
      areaId,
      category: this.normalizeTemplateCategory(category),
    });

    return result.rows[0];
  }

  async approveTemplateByAdmin(id: number) {
    const result = await this.whatsappTemplateRepository.approveTemplateByAdmin(id);
    return result.rows[0];
  }

  async rejectTemplateByAdmin(id: number) {
    const result = await this.whatsappTemplateRepository.rejectTemplateByAdmin(id);
    return result.rows[0];
  }

  async deleteTemplate(id: number) {
    await this.whatsappTemplateRepository.deleteTemplate(id);
    return { success: true };
  }

  private normalizeTemplateCategory(category?: string) {
    const normalized = String(category || 'UTILITY').trim().toUpperCase();
    return ['UTILITY', 'MARKETING', 'AUTHENTICATION'].includes(normalized) ? normalized : 'UTILITY';
  }
}