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;
    language: string;
    metaTemplateName: string;
    headerType?: string | null;
    headerText?: string | null;
    footerText?: string | null;
    buttonsJson: string | null;
    bodyVariablesJson: string | null;
  }) {
    return this.database.query(
      `
        INSERT INTO whatsapp_templates (
          name, content, category, area_id, language,
          meta_template_name, header_type, header_text, footer_text,
          buttons, body_variables, status, updated_at
        )
        VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10::jsonb, $11::jsonb, 'draft', CURRENT_TIMESTAMP)
        ON CONFLICT (name) DO UPDATE SET
          content            = EXCLUDED.content,
          category           = EXCLUDED.category,
          area_id            = EXCLUDED.area_id,
          language           = EXCLUDED.language,
          meta_template_name = EXCLUDED.meta_template_name,
          header_type        = EXCLUDED.header_type,
          header_text        = EXCLUDED.header_text,
          footer_text        = EXCLUDED.footer_text,
          buttons            = EXCLUDED.buttons,
          body_variables     = EXCLUDED.body_variables,
          status             = 'draft',
          meta_status        = NULL,
          meta_template_id   = NULL,
          meta_submitted_at  = NULL,
          meta_approved_at   = NULL,
          updated_at         = CURRENT_TIMESTAMP
        RETURNING *
      `,
      [
        input.name,
        input.content,
        input.category,
        input.areaId || null,
        input.language,
        input.metaTemplateName,
        input.headerType || null,
        input.headerText || null,
        input.footerText || null,
        input.buttonsJson,
        input.bodyVariablesJson,
      ],
    );
  }

  updateTemplate(
    id: number,
    input: {
      name: string;
      content: string;
      category: string;
      areaId?: number | null;
      language: string;
      metaTemplateName: string;
      headerType?: string | null;
      headerText?: string | null;
      footerText?: string | null;
      buttonsJson: string | null;
      bodyVariablesJson: string | null;
    },
  ) {
    return this.database.query(
      `
        UPDATE whatsapp_templates SET
          name               = $1,
          content            = $2,
          category           = $3,
          area_id            = $4,
          language           = $5,
          meta_template_name = $6,
          header_type        = $7,
          header_text        = $8,
          footer_text        = $9,
          buttons            = $10::jsonb,
          body_variables     = $11::jsonb,
          status             = 'draft',
          meta_status        = NULL,
          meta_template_id   = NULL,
          meta_submitted_at  = NULL,
          meta_approved_at   = NULL,
          updated_at         = CURRENT_TIMESTAMP
        WHERE id = $12
        RETURNING *
      `,
      [
        input.name,
        input.content,
        input.category,
        input.areaId || null,
        input.language,
        input.metaTemplateName,
        input.headerType || null,
        input.headerText || null,
        input.footerText || null,
        input.buttonsJson,
        input.bodyVariablesJson,
        id,
      ],
    );
  }

  updateMetaInfo(
    id: number,
    info: { metaTemplateId?: string; metaTemplateName?: string; metaStatus: string },
  ) {
    return this.database.query(
      `UPDATE whatsapp_templates SET
        meta_template_id   = COALESCE($2, meta_template_id),
        meta_template_name = COALESCE($3, meta_template_name),
        meta_status        = $4,
        meta_submitted_at  = CURRENT_TIMESTAMP,
        status             = 'pending',
        updated_at         = CURRENT_TIMESTAMP
      WHERE id = $1
      RETURNING *`,
      [id, info.metaTemplateId || null, info.metaTemplateName || null, info.metaStatus],
    );
  }

  async updateMetaStatusByName(metaName: string, metaStatus: string, metaId: string): Promise<number> {
    const result = await this.database.query(
      `UPDATE whatsapp_templates SET
        meta_status      = $2,
        meta_template_id = COALESCE($3, meta_template_id),
        meta_approved_at = CASE WHEN $2 = 'APPROVED' THEN CURRENT_TIMESTAMP ELSE meta_approved_at END,
        updated_at       = CURRENT_TIMESTAMP
      WHERE meta_template_name = $1`,
      [metaName, metaStatus, metaId || null],
    );
    return result.rowCount || 0;
  }

  async importFromMeta(input: {
    metaTemplateId: string;
    metaTemplateName: string;
    metaStatus: string;
    language: string;
    category: string;
    content: string;
    headerType?: string | null;
    headerText?: string | null;
    footerText?: string | null;
    buttonsJson: string | null;
  }): Promise<boolean> {
    try {
      const result = await this.database.query(
        `INSERT INTO whatsapp_templates (
          name, content, category, language,
          meta_template_name, meta_template_id, meta_status,
          header_type, header_text, footer_text, buttons, body_variables,
          status, meta_approved_at, updated_at
        )
        VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11::jsonb, NULL,
          CASE WHEN $7 = 'APPROVED' THEN 'approved' ELSE 'pending' END,
          CASE WHEN $7 = 'APPROVED' THEN CURRENT_TIMESTAMP ELSE NULL END,
          CURRENT_TIMESTAMP
        )
        ON CONFLICT (meta_template_name) WHERE meta_template_name IS NOT NULL DO NOTHING`,
        [
          input.metaTemplateName,
          input.content,
          input.category,
          input.language,
          input.metaTemplateName,
          input.metaTemplateId,
          input.metaStatus,
          input.headerType || null,
          input.headerText || null,
          input.footerText || null,
          input.buttonsJson,
        ],
      );
      return (result.rowCount || 0) > 0;
    } catch {
      return false;
    }
  }

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