import {
  Body,
  Controller,
  Delete,
  Get,
  Param,
  Post,
  Put,
  Patch,
  Req,
  UnauthorizedException,
} from '@nestjs/common';
import { CanvasService } from './canvas.service.js';

type AuthedRequest = { userId?: string };
type CanvasBody = { title?: string; format?: string; source?: string };

@Controller('channels/:id/canvas')
export class CanvasController {
  constructor(private readonly canvas: CanvasService) {}

  private uid(req: AuthedRequest): string {
    const userId = req.userId ?? '';
    if (!userId) throw new UnauthorizedException('missing user');
    return userId;
  }

  @Get()
  get(@Req() req: AuthedRequest, @Param('id') channelId: string) {
    return this.canvas.get(channelId, this.uid(req));
  }

  // share / replace (caller becomes the sharer)
  @Put()
  @Post()
  share(
    @Req() req: AuthedRequest,
    @Param('id') channelId: string,
    @Body() body: CanvasBody,
  ) {
    return this.canvas.share(channelId, this.uid(req), body ?? {});
  }

  // update in place (original sharer only)
  @Patch()
  update(
    @Req() req: AuthedRequest,
    @Param('id') channelId: string,
    @Body() body: CanvasBody,
  ) {
    return this.canvas.update(channelId, this.uid(req), body ?? {});
  }

  @Delete()
  remove(@Req() req: AuthedRequest, @Param('id') channelId: string) {
    return this.canvas.remove(channelId, this.uid(req));
  }
}