import { Body, Controller, Get, Param, Post, Req } from '@nestjs/common';
import {
  CreateVersionInput,
  PageVersionContentView,
  PageVersionView,
  createVersionInputSchema,
} from '@dorfteich/shared';

import { AuthedRequest } from '../auth/auth.guard';
import { ZodValidationPipe } from '../common/zod-validation.pipe';
import { RequiresPagePermission } from '../permissions/permission.decorators';
import { VersionsService } from './versions.service';

/**
 * Page version history (issue #41/#42, ADR 0013). Every route requires write
 * access to the page — viewing history is gated like editing (permissions.md).
 */
@Controller()
export class VersionsController {
  constructor(private readonly versions: VersionsService) {}

  /** List the page's versions, newest first. */
  @Get('pages/:id/versions')
  @RequiresPagePermission('write', { idParam: 'id' }) // history = write (ADR 0013)
  async list(@Param('id') id: string, @Req() request: AuthedRequest): Promise<PageVersionView[]> {
    return this.versions.list(request.user!, id);
  }

  /** A single version rendered read-only, with Markdown for diffing. */
  @Get('pages/:id/versions/:versionId')
  @RequiresPagePermission('write', { idParam: 'id' })
  async getContent(
    @Param('id') id: string,
    @Param('versionId') versionId: string,
    @Req() request: AuthedRequest,
  ): Promise<PageVersionContentView> {
    return this.versions.getContent(request.user!, id, versionId);
  }

  /** Create a named version of the page. */
  @Post('pages/:id/versions')
  @RequiresPagePermission('write', { idParam: 'id' })
  async createNamed(
    @Param('id') id: string,
    @Body(new ZodValidationPipe(createVersionInputSchema)) input: CreateVersionInput,
    @Req() request: AuthedRequest,
  ): Promise<PageVersionView> {
    return this.versions.createNamed(request.user!, id, input);
  }

  /** Restore the page to an earlier version (creates a pre-restore snapshot). */
  @Post('pages/:id/versions/:versionId/restore')
  @RequiresPagePermission('write', { idParam: 'id' })
  async restore(
    @Param('id') id: string,
    @Param('versionId') versionId: string,
    @Req() request: AuthedRequest,
  ): Promise<PageVersionView> {
    return this.versions.restore(request.user!, id, versionId);
  }
}