import { Injectable } from '@nestjs/common';
import { DatabaseService } from '../../../infra/database/database.service';

@Injectable()
export class WhatsappTemplateRepository {
  constructor(private readonly database: DatabaseService) {}

  listTemplates() {
    return this.database.query(`
      SELECT
        wt.*,
        a.nome AS area_nome
      FROM whatsapp_templates wt
      LEFT JOIN areas a ON a.id = wt.area_id
      ORDER BY wt.id ASC
    `);
  }

  getTemplateById(id: number) {
    return this.database.query('SELECT * FROM whatsapp_templates WHERE id = $1 LIMIT 1', [id]);
  }

  saveTemplate(input: {
    name: string;
    content: string;
    category: string;
    areaId?: number | null;
    status: string;
    requestedByRole: string;
    adminApprovedAtSql: 'NULL' | 'CURRENT_TIMESTAMP';
    metaSubmittedAtSql: 'NULL' | 'CURRENT_TIMESTAMP';
  }) {
    return this.database.query(
      `
        INSERT INTO whatsapp_templates (
          name,
          content,
          category,
          area_id,
          status,
          requested_by_role,
          admin_approved_at,
          meta_submitted_at,
          meta_approved_at,
          updated_at
        )
        VALUES ($1, $2, $3, $4, $5, $6, ${input.adminApprovedAtSql}, ${input.metaSubmittedAtSql}, NULL, CURRENT_TIMESTAMP)
        ON CONFLICT (name) DO UPDATE SET
          content = EXCLUDED.content,
          category = EXCLUDED.category,
          area_id = EXCLUDED.area_id,
          status = EXCLUDED.status,
          requested_by_role = EXCLUDED.requested_by_role,
          admin_approved_at = EXCLUDED.admin_approved_at,
          meta_submitted_at = EXCLUDED.meta_submitted_at,
          meta_approved_at = NULL,
          updated_at = CURRENT_TIMESTAMP
        RETURNING *
      `,
      [input.name, input.content, input.category, input.areaId || null, input.status, input.requestedByRole],
    );
  }

  updateTemplate(id: number, input: { name: string; content: string; category: string; areaId?: number | null }) {
    return this.database.query(
      `
        UPDATE whatsapp_templates
        SET
          name = $1,
          content = $2,
          category = $3,
          area_id = $4,
          status = 'meta_review',
          admin_approved_at = CURRENT_TIMESTAMP,
          meta_submitted_at = CURRENT_TIMESTAMP,
          meta_approved_at = NULL,
          updated_at = CURRENT_TIMESTAMP
        WHERE id = $5
        RETURNING *
      `,
      [input.name, input.content, input.category, input.areaId || null, id],
    );
  }

  approveTemplateByAdmin(id: number) {
    return this.database.query(
      `
        UPDATE whatsapp_templates
        SET
          status = 'meta_review',
          admin_approved_at = CURRENT_TIMESTAMP,
          meta_submitted_at = CURRENT_TIMESTAMP,
          meta_approved_at = NULL,
          updated_at = CURRENT_TIMESTAMP
        WHERE id = $1
        RETURNING *
      `,
      [id],
    );
  }

  rejectTemplateByAdmin(id: number) {
    return this.database.query(
      `
        UPDATE whatsapp_templates
        SET
          status = 'rejected',
          updated_at = CURRENT_TIMESTAMP
        WHERE id = $1
        RETURNING *
      `,
      [id],
    );
  }

  deleteTemplate(id: number) {
    return this.database.query('DELETE FROM whatsapp_templates WHERE id = $1', [id]);
  }

  refreshMetaApprovals() {
    return this.database.query(`
      UPDATE whatsapp_templates
      SET
        status = 'approved',
        meta_approved_at = COALESCE(meta_approved_at, meta_submitted_at + INTERVAL '15 minutes'),
        updated_at = CURRENT_TIMESTAMP
      WHERE status = 'meta_review'
        AND meta_submitted_at IS NOT NULL
        AND meta_submitted_at <= CURRENT_TIMESTAMP - INTERVAL '15 minutes'
    `);
  }
}