import {
  Body,
  Controller,
  Delete,
  Get,
  HttpCode,
  Param,
  Patch,
  Post,
  Put,
  Query,
  Req,
  Res,
  UseGuards,
} from '@nestjs/common';
import {
  commentListQuerySchema,
  createCommentInputSchema,
  createLabelInputSchema,
  pageListQuerySchema,
  publicCreatePageInputSchema,
  publicSearchQuerySchema,
  publicUpdateLabelInputSchema,
  publicUpdatePageInputSchema,
  type CreateCommentInput,
  type CreateLabelInput,
  type LabelTreeNode,
  type LabelView,
  type PageCommentsView,
  type PublicCommentView,
  type PublicCreatePageInput,
  type PublicMeView,
  type PublicPageListItemView,
  type PublicPageView,
  type PublicPondView,
  type PublicSearchQuery,
  type PublicSearchResultView,
  type PublicUpdateLabelInput,
  type PublicUpdatePageInput,
} from '@dorfteich/shared';
import type { Response } from 'express';

import { Public } from '../auth/auth.guard';
import { ZodValidationPipe } from '../common/zod-validation.pipe';
import { ExportService } from '../import-export/export.service';
import { RequiresPagePermission, RequiresPondRole } from '../permissions/permission.decorators';
import { PublicApiGuard, RequiresWriteScope, type PublicApiRequest } from './public-api.guard';
import { PublicApiService } from './public-api.service';

/** Shorthands: every page route names the page the same way. */
const PAGE = { pondSlugParam: 'pondSlug', slugParam: 'pageSlug' } as const;
const POND = { slugParam: 'pondSlug' } as const;

/**
 * The public REST API v1 (issue #104), served outside the SPA prefix at
 * `/api/public/v1` (main.ts excludes it from the global prefix). `@Public()`
 * only skips the cookie-session AuthGuard — the {@link PublicApiGuard}
 * enforces PAT bearer auth, the instance switch, scope, per-token rate
 * limits, and the pond opt-in; the method-level permission decorators then
 * apply the unchanged permission model (404-vs-403 per #60) as the token's
 * user.
 */
@Controller('api/public/v1')
@Public()
@UseGuards(PublicApiGuard)
export class PublicApiController {
  constructor(
    private readonly publicApi: PublicApiService,
    private readonly exports: ExportService,
  ) {}

  @Get('me')
  me(@Req() request: PublicApiRequest): Promise<PublicMeView> {
    return this.publicApi.me(request.user!, request.apiToken!);
  }

  @Get('ponds')
  listPonds(@Req() request: PublicApiRequest): Promise<PublicPondView[]> {
    return this.publicApi.listPonds(request.user!, request.apiToken!);
  }

  @Get('ponds/:pondSlug')
  @RequiresPondRole('reader', POND)
  getPond(@Param('pondSlug') pondSlug: string): Promise<PublicPondView> {
    return this.publicApi.getPond(pondSlug);
  }

  @Get('ponds/:pondSlug/pages')
  @RequiresPondRole('reader', POND)
  listPages(
    @Param('pondSlug') pondSlug: string,
    @Query('createdSince') createdSince: string | undefined,
    @Query('updatedSince') updatedSince: string | undefined,
    @Req() request: PublicApiRequest,
  ): Promise<PublicPageListItemView[]> {
    // Optional time filters (issue #148); an invalid instant → 400.
    const query = new ZodValidationPipe(pageListQuerySchema).transform({
      createdSince: createdSince || undefined,
      updatedSince: updatedSince || undefined,
    });
    return this.publicApi.listPages(request.user!, pondSlug, query);
  }

  @Post('ponds/:pondSlug/pages')
  @RequiresWriteScope()
  @RequiresPondRole('editor', POND)
  createPage(
    @Param('pondSlug') pondSlug: string,
    @Body(new ZodValidationPipe(publicCreatePageInputSchema)) input: PublicCreatePageInput,
    @Req() request: PublicApiRequest,
  ): Promise<PublicPageView> {
    return this.publicApi.createPage(request.user!, request.apiToken!, pondSlug, input);
  }

  @Get('ponds/:pondSlug/pages/:pageSlug')
  @RequiresPagePermission('read', PAGE)
  getPage(
    @Param('pondSlug') pondSlug: string,
    @Param('pageSlug') pageSlug: string,
    @Req() request: PublicApiRequest,
  ): Promise<PublicPageView> {
    return this.publicApi.getPage(request.user!, pondSlug, pageSlug);
  }

  @Patch('ponds/:pondSlug/pages/:pageSlug')
  @RequiresWriteScope()
  @RequiresPagePermission('write', PAGE)
  updatePage(
    @Param('pondSlug') pondSlug: string,
    @Param('pageSlug') pageSlug: string,
    @Body(new ZodValidationPipe(publicUpdatePageInputSchema)) input: PublicUpdatePageInput,
    @Req() request: PublicApiRequest,
  ): Promise<PublicPageView> {
    return this.publicApi.updatePage(request.user!, request.apiToken!, pondSlug, pageSlug, input);
  }

  @Delete('ponds/:pondSlug/pages/:pageSlug')
  @RequiresWriteScope()
  @RequiresPagePermission('write', PAGE)
  @HttpCode(204)
  async deletePage(
    @Param('pondSlug') pondSlug: string,
    @Param('pageSlug') pageSlug: string,
    @Req() request: PublicApiRequest,
  ): Promise<void> {
    await this.publicApi.deletePage(request.user!, request.apiToken!, pondSlug, pageSlug);
  }

  @Get('search')
  search(
    @Query('q') q: string,
    @Query('pond') pond: string | undefined,
    @Query('label') label: string | undefined,
    @Req() request: PublicApiRequest,
  ): Promise<PublicSearchResultView[]> {
    const query: PublicSearchQuery = new ZodValidationPipe(publicSearchQuerySchema).transform({
      q,
      pond: pond || undefined,
      label: label || undefined,
    });
    return this.publicApi.searchPages(request.user!, request.apiToken!, query);
  }

  @Get('ponds/:pondSlug/export/markdown')
  @RequiresPondRole('reader', POND)
  async exportMarkdown(
    @Param('pondSlug') pondSlug: string,
    @Req() request: PublicApiRequest,
    @Res() res: Response,
  ): Promise<void> {
    const pond = await this.publicApi.requirePond(pondSlug);
    await this.exports.streamPondMarkdownZip(request.user!, pond.id, res);
  }

  @Get('ponds/:pondSlug/labels')
  @RequiresPondRole('reader', POND)
  listLabels(
    @Param('pondSlug') pondSlug: string,
    @Req() request: PublicApiRequest,
  ): Promise<LabelTreeNode[]> {
    return this.publicApi.listLabels(request.user!, pondSlug);
  }

  @Post('ponds/:pondSlug/labels')
  @RequiresWriteScope()
  @RequiresPondRole('pond_admin', POND)
  createLabel(
    @Param('pondSlug') pondSlug: string,
    @Body(new ZodValidationPipe(createLabelInputSchema)) input: CreateLabelInput,
    @Req() request: PublicApiRequest,
  ): Promise<LabelView> {
    return this.publicApi.createLabel(request.user!, request.apiToken!, pondSlug, input);
  }

  @Patch('ponds/:pondSlug/labels/:labelId')
  @RequiresWriteScope()
  @RequiresPondRole('pond_admin', POND)
  updateLabel(
    @Param('pondSlug') pondSlug: string,
    @Param('labelId') labelId: string,
    @Body(new ZodValidationPipe(publicUpdateLabelInputSchema)) input: PublicUpdateLabelInput,
    @Req() request: PublicApiRequest,
  ): Promise<LabelView> {
    return this.publicApi.updateLabel(request.user!, request.apiToken!, pondSlug, labelId, input);
  }

  @Delete('ponds/:pondSlug/labels/:labelId')
  @RequiresWriteScope()
  @RequiresPondRole('pond_admin', POND)
  @HttpCode(204)
  async deleteLabel(
    @Param('pondSlug') pondSlug: string,
    @Param('labelId') labelId: string,
    @Req() request: PublicApiRequest,
  ): Promise<void> {
    await this.publicApi.deleteLabel(request.user!, request.apiToken!, pondSlug, labelId);
  }

  @Put('ponds/:pondSlug/pages/:pageSlug/labels/:labelId')
  @RequiresWriteScope()
  @RequiresPagePermission('write', PAGE)
  assignLabel(
    @Param('pondSlug') pondSlug: string,
    @Param('pageSlug') pageSlug: string,
    @Param('labelId') labelId: string,
    @Req() request: PublicApiRequest,
  ): Promise<LabelView[]> {
    return this.publicApi.assignLabel(
      request.user!,
      request.apiToken!,
      pondSlug,
      pageSlug,
      labelId,
    );
  }

  @Delete('ponds/:pondSlug/pages/:pageSlug/labels/:labelId')
  @RequiresWriteScope()
  @RequiresPagePermission('write', PAGE)
  @HttpCode(204)
  async unassignLabel(
    @Param('pondSlug') pondSlug: string,
    @Param('pageSlug') pageSlug: string,
    @Param('labelId') labelId: string,
    @Req() request: PublicApiRequest,
  ): Promise<void> {
    await this.publicApi.unassignLabel(
      request.user!,
      request.apiToken!,
      pondSlug,
      pageSlug,
      labelId,
    );
  }

  @Get('ponds/:pondSlug/pages/:pageSlug/comments')
  @RequiresPagePermission('read', PAGE)
  listComments(
    @Param('pondSlug') pondSlug: string,
    @Param('pageSlug') pageSlug: string,
    @Query('filter') filter: string | undefined,
  ): Promise<PageCommentsView> {
    const parsed = commentListQuerySchema.parse({ filter: filter || undefined });
    return this.publicApi.listComments(pondSlug, pageSlug, parsed.filter);
  }

  @Post('ponds/:pondSlug/pages/:pageSlug/comments')
  @RequiresWriteScope()
  // Read at route level: whether the token's user may COMMENT is the pond's
  // comment policy, enforced in CommentsService (readers vs editors, #91).
  @RequiresPagePermission('read', PAGE)
  createComment(
    @Param('pondSlug') pondSlug: string,
    @Param('pageSlug') pageSlug: string,
    @Body(new ZodValidationPipe(createCommentInputSchema)) input: CreateCommentInput,
    @Req() request: PublicApiRequest,
  ): Promise<PublicCommentView> {
    return this.publicApi.createComment(
      request.user!,
      request.apiToken!,
      pondSlug,
      pageSlug,
      input,
    );
  }

  @Post('ponds/:pondSlug/pages/:pageSlug/comments/:commentId/resolve')
  @RequiresWriteScope()
  @RequiresPagePermission('read', PAGE)
  resolveComment(
    @Param('pondSlug') pondSlug: string,
    @Param('pageSlug') pageSlug: string,
    @Param('commentId') commentId: string,
    @Req() request: PublicApiRequest,
  ): Promise<PublicCommentView> {
    return this.publicApi.setCommentResolved(
      request.user!,
      request.apiToken!,
      pondSlug,
      pageSlug,
      commentId,
      true,
    );
  }

  @Delete('ponds/:pondSlug/pages/:pageSlug/comments/:commentId/resolve')
  @RequiresWriteScope()
  @RequiresPagePermission('read', PAGE)
  unresolveComment(
    @Param('pondSlug') pondSlug: string,
    @Param('pageSlug') pageSlug: string,
    @Param('commentId') commentId: string,
    @Req() request: PublicApiRequest,
  ): Promise<PublicCommentView> {
    return this.publicApi.setCommentResolved(
      request.user!,
      request.apiToken!,
      pondSlug,
      pageSlug,
      commentId,
      false,
    );
  }
}