import {
  BadRequestException,
  Body,
  ConflictException,
  ForbiddenException,
  Controller,
  Delete,
  Get,
  HttpCode,
  HttpException,
  NotFoundException,
  Param,
  Patch,
  PayloadTooLargeException,
  Post,
  Req,
  UploadedFile,
  UseGuards,
  UseInterceptors,
} from '@nestjs/common';
import { FileInterceptor } from '@nestjs/platform-express';
import { pluginModeInputSchema, type PluginModeInput, type PluginView } from '@dorfteich/shared';

import { SiteAdminGuard } from '../admin/site-admin.guard';
import { AuthedRequest } from '../auth/auth.guard';
import { ZodValidationPipe } from '../common/zod-validation.pipe';

import { PluginsEnabledGuard } from './plugins-enabled.guard';
import { PluginsService } from './plugins.service';
import { MAX_PLUGIN_ZIP_BYTES, PluginPackageError } from './plugin.constants';

/** Maps a package/registry error to the HTTP status that fits its class. */
function toHttpException(error: PluginPackageError): HttpException {
  const body = error.details
    ? { code: error.code, message: error.message, details: error.details }
    : { code: error.code, message: error.message };
  switch (error.code) {
    case 'plugin_not_found':
      return new NotFoundException(body);
    case 'plugin_required_cannot_uninstall':
    case 'plugin_version_not_higher':
    case 'plugin_not_optional':
      return new ConflictException(body);
    // Hash pinning (#232): the upload is well-formed, the policy says no.
    case 'plugin_not_pinned':
    case 'plugin_hash_mismatch':
      return new ForbiddenException(body);
    case 'plugin_too_large':
      return new PayloadTooLargeException(body);
    default:
      return new BadRequestException(body);
  }
}

/**
 * Site Admin plugin administration (ADR 0008, issue #71). Installing is
 * deliberately restricted to Site Admins (kickoff decision); the instance-mode
 * and per-pond-activation writes arrive with the admin UI (#72).
 */
@Controller('admin/plugins')
// Kill switch first (issue #200): while plugins are disabled instance-wide,
// even a Site Admin sees 404 here — the switch is flipped in the settings
// panel, not by probing dead routes.
@UseGuards(PluginsEnabledGuard, SiteAdminGuard)
export class PluginAdminController {
  constructor(private readonly plugins: PluginsService) {}

  /** Upload and install (or update) a plugin ZIP. */
  @Post()
  @UseInterceptors(FileInterceptor('file', { limits: { fileSize: MAX_PLUGIN_ZIP_BYTES } }))
  async install(
    @UploadedFile() file: Express.Multer.File | undefined,
    @Req() request: AuthedRequest,
  ): Promise<PluginView> {
    if (!file) throw new BadRequestException({ code: 'bad_request', message: 'No file uploaded' });
    try {
      return await this.plugins.install(file.buffer, request.user!);
    } catch (error) {
      if (error instanceof PluginPackageError) throw toHttpException(error);
      throw error;
    }
  }

  /** All installed plugins. */
  @Get()
  list(): Promise<PluginView[]> {
    return this.plugins.list();
  }

  /** Set a plugin's instance mode: disabled | optional | required (#72). */
  @Patch(':id/mode')
  async setMode(
    @Param('id') id: string,
    @Body(new ZodValidationPipe(pluginModeInputSchema)) body: PluginModeInput,
    @Req() request: AuthedRequest,
  ): Promise<PluginView> {
    try {
      return await this.plugins.setMode(id, body.mode, request.user!);
    } catch (error) {
      if (error instanceof PluginPackageError) throw toHttpException(error);
      throw error;
    }
  }

  /** Uninstall a plugin (refused while `required`). */
  @Delete(':id')
  @HttpCode(204)
  async uninstall(@Param('id') id: string, @Req() request: AuthedRequest): Promise<void> {
    try {
      await this.plugins.uninstall(id, request.user!);
    } catch (error) {
      if (error instanceof PluginPackageError) throw toHttpException(error);
      throw error;
    }
  }
}