import { Injectable } from '@nestjs/common';
import { DatabaseService } from '../database/database.service';
import type { ModuleConfigurationField, ModuleManifest, ModuleRecord, ModuleStatus } from './manifest.types';

interface ModuleRow {
  id: string;
  module_id: string;
  name: string;
  slug: string;
  version: string;
  description: string;
  author: string;
  path: string;
  status: ModuleStatus;
  internal_port: number;
  healthcheck_url: string;
  enabled: boolean;
  created_at: Date;
  updated_at: Date;
  compose_file: string | null;
  app_service: string | null;
  configuration_schema: ModuleConfigurationField[];
  configuration_ready: boolean;
}

const MODULE_COLUMNS = `id, module_id, name, slug, version, description, author, path,
                        status, internal_port, healthcheck_url, enabled, created_at, updated_at,
                        compose_file, app_service, configuration_schema, configuration_ready`;

/**
 * Modul-Repository (Infrastructure): Datenbankzugriffe für die Modul-Registry.
 * Keine Business-Logik – nur parametrisierten Datenzugriff.
 */
@Injectable()
export class ModuleRepository {
  constructor(private readonly database: DatabaseService) {}

  async list(): Promise<ModuleRecord[]> {
    const result = await this.database.query<ModuleRow>(
      `SELECT ${MODULE_COLUMNS} FROM modules ORDER BY created_at ASC`,
    );
    return result.rows.map((row) => this.mapRow(row));
  }

  async findByModuleId(moduleId: string): Promise<ModuleRecord | null> {
    const result = await this.database.query<ModuleRow>(
      `SELECT ${MODULE_COLUMNS} FROM modules WHERE module_id = $1`,
      [moduleId],
    );
    return result.rows[0] ? this.mapRow(result.rows[0]) : null;
  }

  async findBySlug(slug: string): Promise<ModuleRecord | null> {
    const result = await this.database.query<ModuleRow>(
      `SELECT ${MODULE_COLUMNS} FROM modules WHERE slug = $1`,
      [slug],
    );
    return result.rows[0] ? this.mapRow(result.rows[0]) : null;
  }

  async findByPort(port: number): Promise<ModuleRecord | null> {
    const result = await this.database.query<ModuleRow>(
      `SELECT ${MODULE_COLUMNS} FROM modules WHERE internal_port = $1`,
      [port],
    );
    return result.rows[0] ? this.mapRow(result.rows[0]) : null;
  }

  async findById(id: string): Promise<ModuleRecord | null> {
    const result = await this.database.query<ModuleRow>(
      `SELECT ${MODULE_COLUMNS} FROM modules WHERE id = $1`,
      [id],
    );
    return result.rows[0] ? this.mapRow(result.rows[0]) : null;
  }

  async findByStatus(statuses: readonly ModuleStatus[]): Promise<ModuleRecord[]> {
    const result = await this.database.query<ModuleRow>(
      `SELECT ${MODULE_COLUMNS} FROM modules WHERE status = ANY($1::text[])`,
      [statuses],
    );
    return result.rows.map((row) => this.mapRow(row));
  }

  async create(manifest: ModuleManifest, directory: string): Promise<ModuleRecord> {
    const result = await this.database.query<ModuleRow>(
      `INSERT INTO modules
         (module_id, name, slug, version, description, author, path, status, internal_port, healthcheck_url,
          compose_file, app_service, configuration_schema, configuration_ready)
       VALUES ($1, $2, $3, $4, $5, $6, $7, 'INSTALLED', $8, $9, $10, $11, $12::jsonb, $13)
       RETURNING ${MODULE_COLUMNS}`,
      [
        manifest.id,
        manifest.name,
        manifest.slug,
        manifest.version,
        manifest.description,
        manifest.author,
        directory,
        manifest.port,
        manifest.healthcheck,
        manifest.composeFile ?? null,
        manifest.appService ?? null,
        JSON.stringify(manifest.configuration),
        manifest.configuration.every((field) => !field.required || field.defaultValue !== undefined),
      ],
    );
    return this.mapRow(result.rows[0]);
  }

  async updateStatus(id: string, status: ModuleStatus): Promise<void> {
    await this.database.query(
      'UPDATE modules SET status = $2, updated_at = now() WHERE id = $1',
      [id, status],
    );
  }

  async updateEnabled(id: string, enabled: boolean): Promise<void> {
    await this.database.query(
      'UPDATE modules SET enabled = $2, updated_at = now() WHERE id = $1',
      [id, enabled],
    );
  }

  async updateManifest(id: string, manifest: ModuleManifest, configurationReady: boolean): Promise<void> {
    await this.database.query(
      `UPDATE modules SET name = $2, version = $3, description = $4, author = $5,
         internal_port = $6, healthcheck_url = $7, compose_file = $8, app_service = $9,
         configuration_schema = $10::jsonb, configuration_ready = $11, updated_at = now()
       WHERE id = $1`,
      [id, manifest.name, manifest.version, manifest.description, manifest.author, manifest.port,
        manifest.healthcheck, manifest.composeFile ?? null, manifest.appService ?? null,
        JSON.stringify(manifest.configuration), configurationReady],
    );
  }

  async delete(id: string): Promise<void> {
    await this.database.query('DELETE FROM modules WHERE id = $1', [id]);
  }

  private mapRow(row: ModuleRow): ModuleRecord {
    return {
      id: row.id,
      moduleId: row.module_id,
      name: row.name,
      slug: row.slug,
      version: row.version,
      description: row.description,
      author: row.author,
      path: row.path,
      status: row.status,
      internalPort: row.internal_port,
      healthcheckUrl: row.healthcheck_url,
      enabled: row.enabled,
      createdAt: row.created_at,
      updatedAt: row.updated_at,
      composeFile: row.compose_file,
      appService: row.app_service,
      configuration: row.configuration_schema,
      configurationReady: row.configuration_ready,
    };
  }

  async updateConfigurationReady(id: string, ready: boolean): Promise<void> {
    await this.database.query(
      'UPDATE modules SET configuration_ready = $2, updated_at = now() WHERE id = $1',
      [id, ready],
    );
  }
}