import {
  BadRequestException,
  Body,
  Controller,
  ForbiddenException,
  HttpCode,
  HttpStatus,
  NotFoundException,
  Post,
  UseGuards,
} from '@nestjs/common';
import { PageService } from './services/page.service';
import { CreatePageDto } from './dto/create-page.dto';
import { UpdatePageDto } from './dto/update-page.dto';
import { MovePageDto, MovePageToSpaceDto } from './dto/move-page.dto';
import {
  DeletePageDto,
  PageHistoryIdDto,
  PageIdDto,
  PageInfoDto,
} from './dto/page.dto';
import { PageHistoryService } from './services/page-history.service';
import { AuthUser } from '../../common/decorators/auth-user.decorator';
import { AuthWorkspace } from '../../common/decorators/auth-workspace.decorator';
import { JwtAuthGuard } from '../../common/guards/jwt-auth.guard';
import { PaginationOptions } from '@docmost/db/pagination/pagination-options';
import { User, Workspace } from '@docmost/db/types/entity.types';
import { SidebarPageDto } from './dto/sidebar-page.dto';
import {
  SpaceCaslAction,
  SpaceCaslSubject,
} from '../casl/interfaces/space-ability.type';
import SpaceAbilityFactory from '../casl/abilities/space-ability.factory';
import { PageRepo } from '@docmost/db/repos/page/page.repo';
import { RecentPageDto } from './dto/recent-page.dto';
import { DuplicatePageDto } from './dto/duplicate-page.dto';
import { DeletedPageDto } from './dto/deleted-page.dto';

@UseGuards(JwtAuthGuard)
@Controller('pages')
export class PageController {
  constructor(
    private readonly pageService: PageService,
    private readonly pageRepo: PageRepo,
    private readonly pageHistoryService: PageHistoryService,
    private readonly spaceAbility: SpaceAbilityFactory,
  ) {}

  @HttpCode(HttpStatus.OK)
  @Post('/info')
  async getPage(@Body() dto: PageInfoDto, @AuthUser() user: User) {
    const page = await this.pageRepo.findById(dto.pageId, {
      includeSpace: true,
      includeContent: true,
      includeCreator: true,
      includeLastUpdatedBy: true,
      includeContributors: true,
    });

    if (!page) {
      throw new NotFoundException('Page not found');
    }

    const ability = await this.spaceAbility.createForUser(user, page.spaceId);
    if (ability.cannot(SpaceCaslAction.Read, SpaceCaslSubject.Page)) {
      throw new ForbiddenException();
    }

    return page;
  }

  @HttpCode(HttpStatus.OK)
  @Post('create')
  async create(
    @Body() createPageDto: CreatePageDto,
    @AuthUser() user: User,
    @AuthWorkspace() workspace: Workspace,
  ) {
    const ability = await this.spaceAbility.createForUser(
      user,
      createPageDto.spaceId,
    );
    if (ability.cannot(SpaceCaslAction.Create, SpaceCaslSubject.Page)) {
      throw new ForbiddenException();
    }

    return this.pageService.create(user.id, workspace.id, createPageDto);
  }

  @HttpCode(HttpStatus.OK)
  @Post('update')
  async update(@Body() updatePageDto: UpdatePageDto, @AuthUser() user: User) {
    const page = await this.pageRepo.findById(updatePageDto.pageId);

    if (!page) {
      throw new NotFoundException('Page not found');
    }

    const ability = await this.spaceAbility.createForUser(user, page.spaceId);
    if (ability.cannot(SpaceCaslAction.Edit, SpaceCaslSubject.Page)) {
      throw new ForbiddenException();
    }

    return this.pageService.update(page, updatePageDto, user.id);
  }

  @HttpCode(HttpStatus.OK)
  @Post('delete')
  async delete(
    @Body() deletePageDto: DeletePageDto,
    @AuthUser() user: User,
    @AuthWorkspace() workspace: Workspace,
  ) {
    const page = await this.pageRepo.findById(deletePageDto.pageId);

    if (!page) {
      throw new NotFoundException('Page not found');
    }

    const ability = await this.spaceAbility.createForUser(user, page.spaceId);

    if (deletePageDto.permanentlyDelete) {
      // Permanent deletion requires space admin permissions
      if (ability.cannot(SpaceCaslAction.Manage, SpaceCaslSubject.Settings)) {
        throw new ForbiddenException(
          'Only space admins can permanently delete pages',
        );
      }
      await this.pageService.forceDelete(deletePageDto.pageId, workspace.id);
    } else {
      // Soft delete requires page manage permissions
      if (ability.cannot(SpaceCaslAction.Manage, SpaceCaslSubject.Page)) {
        throw new ForbiddenException();
      }
      await this.pageService.removePage(
        deletePageDto.pageId,
        user.id,
        workspace.id,
      );
    }
  }

  @HttpCode(HttpStatus.OK)
  @Post('restore')
  async restore(
    @Body() pageIdDto: PageIdDto,
    @AuthUser() user: User,
    @AuthWorkspace() workspace: Workspace,
  ) {
    const page = await this.pageRepo.findById(pageIdDto.pageId);

    if (!page) {
      throw new NotFoundException('Page not found');
    }

    const ability = await this.spaceAbility.createForUser(user, page.spaceId);
    if (ability.cannot(SpaceCaslAction.Manage, SpaceCaslSubject.Page)) {
      throw new ForbiddenException();
    }

    await this.pageRepo.restorePage(pageIdDto.pageId, workspace.id);

    return this.pageRepo.findById(pageIdDto.pageId, {
      includeHasChildren: true,
    });
  }

  @HttpCode(HttpStatus.OK)
  @Post('recent')
  async getRecentPages(
    @Body() recentPageDto: RecentPageDto,
    @Body() pagination: PaginationOptions,
    @AuthUser() user: User,
  ) {
    if (recentPageDto.spaceId) {
      const ability = await this.spaceAbility.createForUser(
        user,
        recentPageDto.spaceId,
      );

      if (ability.cannot(SpaceCaslAction.Read, SpaceCaslSubject.Page)) {
        throw new ForbiddenException();
      }

      return this.pageService.getRecentSpacePages(
        recentPageDto.spaceId,
        pagination,
      );
    }

    return this.pageService.getRecentPages(user.id, pagination);
  }

  @HttpCode(HttpStatus.OK)
  @Post('trash')
  async getDeletedPages(
    @Body() deletedPageDto: DeletedPageDto,
    @Body() pagination: PaginationOptions,
    @AuthUser() user: User,
  ) {
    if (deletedPageDto.spaceId) {
      const ability = await this.spaceAbility.createForUser(
        user,
        deletedPageDto.spaceId,
      );

      if (ability.cannot(SpaceCaslAction.Manage, SpaceCaslSubject.Page)) {
        throw new ForbiddenException();
      }

      return this.pageService.getDeletedSpacePages(
        deletedPageDto.spaceId,
        pagination,
      );
    }
  }

  // TODO: scope to workspaces
  @HttpCode(HttpStatus.OK)
  @Post('/history')
  async getPageHistory(
    @Body() dto: PageIdDto,
    @Body() pagination: PaginationOptions,
    @AuthUser() user: User,
  ) {
    const page = await this.pageRepo.findById(dto.pageId);
    if (!page) {
      throw new NotFoundException('Page not found');
    }

    const ability = await this.spaceAbility.createForUser(user, page.spaceId);
    if (ability.cannot(SpaceCaslAction.Read, SpaceCaslSubject.Page)) {
      throw new ForbiddenException();
    }

    return this.pageHistoryService.findHistoryByPageId(page.id, pagination);
  }

  @HttpCode(HttpStatus.OK)
  @Post('/history/info')
  async getPageHistoryInfo(
    @Body() dto: PageHistoryIdDto,
    @AuthUser() user: User,
  ) {
    const history = await this.pageHistoryService.findById(dto.historyId);
    if (!history) {
      throw new NotFoundException('Page history not found');
    }

    const ability = await this.spaceAbility.createForUser(
      user,
      history.spaceId,
    );
    if (ability.cannot(SpaceCaslAction.Read, SpaceCaslSubject.Page)) {
      throw new ForbiddenException();
    }
    return history;
  }

  @HttpCode(HttpStatus.OK)
  @Post('/sidebar-pages')
  async getSidebarPages(
    @Body() dto: SidebarPageDto,
    @Body() pagination: PaginationOptions,
    @AuthUser() user: User,
  ) {
    if (!dto.spaceId && !dto.pageId) {
      throw new BadRequestException(
        'Either spaceId or pageId must be provided',
      );
    }
    let spaceId = dto.spaceId;

    if (dto.pageId) {
      const page = await this.pageRepo.findById(dto.pageId);
      if (!page) {
        throw new ForbiddenException();
      }

      spaceId = page.spaceId;
    }

    const ability = await this.spaceAbility.createForUser(user, spaceId);
    if (ability.cannot(SpaceCaslAction.Read, SpaceCaslSubject.Page)) {
      throw new ForbiddenException();
    }

    return this.pageService.getSidebarPages(spaceId, pagination, dto.pageId);
  }

  @HttpCode(HttpStatus.OK)
  @Post('move-to-space')
  async movePageToSpace(
    @Body() dto: MovePageToSpaceDto,
    @AuthUser() user: User,
  ) {
    const movedPage = await this.pageRepo.findById(dto.pageId);
    if (!movedPage) {
      throw new NotFoundException('Page to move not found');
    }
    if (movedPage.spaceId === dto.spaceId) {
      throw new BadRequestException('Page is already in this space');
    }

    const abilities = await Promise.all([
      this.spaceAbility.createForUser(user, movedPage.spaceId),
      this.spaceAbility.createForUser(user, dto.spaceId),
    ]);

    if (
      abilities.some((ability) =>
        ability.cannot(SpaceCaslAction.Edit, SpaceCaslSubject.Page),
      )
    ) {
      throw new ForbiddenException();
    }

    return this.pageService.movePageToSpace(movedPage, dto.spaceId);
  }

  @HttpCode(HttpStatus.OK)
  @Post('duplicate')
  async duplicatePage(@Body() dto: DuplicatePageDto, @AuthUser() user: User) {
    const copiedPage = await this.pageRepo.findById(dto.pageId);
    if (!copiedPage) {
      throw new NotFoundException('Page to copy not found');
    }

    // If spaceId is provided, it's a copy to different space
    if (dto.spaceId) {
      const abilities = await Promise.all([
        this.spaceAbility.createForUser(user, copiedPage.spaceId),
        this.spaceAbility.createForUser(user, dto.spaceId),
      ]);

      if (
        abilities.some((ability) =>
          ability.cannot(SpaceCaslAction.Edit, SpaceCaslSubject.Page),
        )
      ) {
        throw new ForbiddenException();
      }

      return this.pageService.duplicatePage(copiedPage, dto.spaceId, user);
    } else {
      // If no spaceId, it's a duplicate in same space
      const ability = await this.spaceAbility.createForUser(
        user,
        copiedPage.spaceId,
      );
      if (ability.cannot(SpaceCaslAction.Edit, SpaceCaslSubject.Page)) {
        throw new ForbiddenException();
      }

      return this.pageService.duplicatePage(copiedPage, undefined, user);
    }
  }

  @HttpCode(HttpStatus.OK)
  @Post('move')
  async movePage(@Body() dto: MovePageDto, @AuthUser() user: User) {
    const movedPage = await this.pageRepo.findById(dto.pageId);
    if (!movedPage) {
      throw new NotFoundException('Moved page not found');
    }

    const ability = await this.spaceAbility.createForUser(
      user,
      movedPage.spaceId,
    );
    if (ability.cannot(SpaceCaslAction.Edit, SpaceCaslSubject.Page)) {
      throw new ForbiddenException();
    }

    return this.pageService.movePage(dto, movedPage);
  }

  @HttpCode(HttpStatus.OK)
  @Post('/breadcrumbs')
  async getPageBreadcrumbs(@Body() dto: PageIdDto, @AuthUser() user: User) {
    const page = await this.pageRepo.findById(dto.pageId);
    if (!page) {
      throw new NotFoundException('Page not found');
    }

    const ability = await this.spaceAbility.createForUser(user, page.spaceId);
    if (ability.cannot(SpaceCaslAction.Read, SpaceCaslSubject.Page)) {
      throw new ForbiddenException();
    }
    return this.pageService.getPageBreadCrumbs(page.id);
  }
}