import {
  Body,
  Controller,
  Delete,
  ForbiddenException,
  Get,
  HttpCode,
  HttpStatus,
  NotFoundException,
  Param,
  ParseIntPipe,
  Post,
} from '@nestjs/common';
import { Session, type UserSession } from '@thallesp/nestjs-better-auth';
import { ListIssueAttachmentsUseCase } from '../../application/use-cases/list-issue-attachments/list-issue-attachments.use-case.js';
import { AttachFileUseCase } from '../../application/use-cases/attach-file/attach-file.use-case.js';
import { DetachFileUseCase } from '../../application/use-cases/detach-file/detach-file.use-case.js';
import { ListIssueAttachmentsQuery } from '../../application/use-cases/list-issue-attachments/list-issue-attachments.query.js';
import { AttachFileCommand } from '../../application/use-cases/attach-file/attach-file.command.js';
import { DetachFileCommand } from '../../application/use-cases/detach-file/detach-file.command.js';
import { AttachFileRequestDto } from '../dto/attach-file.dto.js';
import { IssueAttachmentNotFoundException } from '../../domain/exceptions/issue-attachment-not-found.exception.js';
import { IssueNotFoundException } from '../../../issue/domain/exceptions/issue-not-found.exception.js';
import { FileNotFoundException } from '../../../file/domain/exceptions/file-not-found.exception.js';
import { FileForbiddenException } from '../../../file/domain/exceptions/file-forbidden.exception.js';
import { IssueEditForbiddenException } from '../../../issue/domain/exceptions/issue-edit-forbidden.exception.js';

/**
 * Вложения задачи. Сам файл загружается отдельно (POST /files),
 * здесь — только привязка к задаче. Скачивание — GET /files/:id/download.
 */
@Controller('issues/:issueId/attachments')
export class IssueAttachmentController {
  constructor(
    private readonly listIssueAttachmentsUseCase: ListIssueAttachmentsUseCase,
    private readonly attachFileUseCase: AttachFileUseCase,
    private readonly detachFileUseCase: DetachFileUseCase,
  ) {}

  @Get()
  list(@Param('issueId', ParseIntPipe) issueId: number, @Session() session: UserSession) {
    return this.handleErrors(() =>
      this.listIssueAttachmentsUseCase.execute(new ListIssueAttachmentsQuery(issueId, session.user.id)),
    );
  }

  @Post()
  attach(
    @Param('issueId', ParseIntPipe) issueId: number,
    @Body() dto: AttachFileRequestDto,
    @Session() session: UserSession,
  ) {
    return this.handleErrors(() =>
      this.attachFileUseCase.execute(new AttachFileCommand(issueId, dto.fileId, session.user.id)),
    );
  }

  @Delete(':fileId')
  @HttpCode(HttpStatus.NO_CONTENT)
  async detach(
    @Param('issueId', ParseIntPipe) issueId: number,
    @Param('fileId') fileId: string,
    @Session() session: UserSession,
  ) {
    await this.handleErrors(() =>
      this.detachFileUseCase.execute(new DetachFileCommand(issueId, fileId, session.user.id)),
    );
  }

  /** Транслирует доменные исключения в HTTP-ответ — это забота presentation-слоя */
  private async handleErrors<T>(fn: () => Promise<T>): Promise<T> {
    try {
      return await fn();
    } catch (error) {
      if (
        error instanceof IssueNotFoundException ||
        error instanceof FileNotFoundException ||
        error instanceof IssueAttachmentNotFoundException
      ) {
        throw new NotFoundException(error.message);
      }
      if (error instanceof FileForbiddenException || error instanceof IssueEditForbiddenException) {
        throw new ForbiddenException(error.message);
      }
      throw error;
    }
  }
}