import {
  BadRequestException,
  Body,
  Controller,
  Delete,
  Get,
  HttpCode,
  HttpStatus,
  Inject,
  NotFoundException,
  Param,
  Patch,
  Post,
  Query,
  UseGuards,
} from '@nestjs/common';
import fs from 'node:fs';
import path from 'node:path';
import { AuthGuard } from '../auth/auth.guard.js';
import { CurrentUser } from '../auth/current-user.decorator.js';
import { CoordService } from './coord.service.js';
import type {
  CreateDbMissionDto,
  UpdateDbMissionDto,
  CreateMissionTaskDto,
  UpdateMissionTaskDto,
} from './coord.dto.js';

/** Walk up from cwd to find the monorepo root (has pnpm-workspace.yaml). */
function findMonorepoRoot(start: string): string {
  let dir = start;
  for (let i = 0; i < 5; i++) {
    try {
      fs.accessSync(path.join(dir, 'pnpm-workspace.yaml'));
      return dir;
    } catch {
      const parent = path.dirname(dir);
      if (parent === dir) break;
      dir = parent;
    }
  }
  return start;
}

/** Only paths under these roots are allowed for coord queries. */
const WORKSPACE_ROOT = process.env['MOSAIC_WORKSPACE_ROOT'] ?? findMonorepoRoot(process.cwd());
const ALLOWED_ROOTS = [process.cwd(), WORKSPACE_ROOT];

function resolveAndValidatePath(raw: string | undefined): string {
  const resolved = path.resolve(raw ?? process.cwd());
  const isAllowed = ALLOWED_ROOTS.some(
    (root) => resolved === root || resolved.startsWith(`${root}/`),
  );
  if (!isAllowed) {
    throw new BadRequestException('projectPath is outside the allowed workspace');
  }
  return resolved;
}

@Controller('api/coord')
@UseGuards(AuthGuard)
export class CoordController {
  constructor(@Inject(CoordService) private readonly coordService: CoordService) {}

  // ── File-based coord endpoints (legacy) ──

  @Get('status')
  async missionStatus(@Query('projectPath') projectPath?: string) {
    const resolvedPath = resolveAndValidatePath(projectPath);
    const status = await this.coordService.getMissionStatus(resolvedPath);
    if (!status) throw new NotFoundException('No active coord mission found');
    return status;
  }

  @Get('tasks')
  async listTasks(@Query('projectPath') projectPath?: string) {
    const resolvedPath = resolveAndValidatePath(projectPath);
    return this.coordService.listTasks(resolvedPath);
  }

  @Get('tasks/:taskId')
  async taskStatus(@Param('taskId') taskId: string, @Query('projectPath') projectPath?: string) {
    const resolvedPath = resolveAndValidatePath(projectPath);
    const detail = await this.coordService.getTaskStatus(resolvedPath, taskId);
    if (!detail) throw new NotFoundException(`Task ${taskId} not found in coord mission`);
    return detail;
  }

  // ── DB-backed mission endpoints ──

  @Get('missions')
  async listDbMissions(@CurrentUser() user: { id: string }) {
    return this.coordService.getMissionsByUser(user.id);
  }

  @Get('missions/:id')
  async getDbMission(@Param('id') id: string, @CurrentUser() user: { id: string }) {
    const mission = await this.coordService.getMissionByIdAndUser(id, user.id);
    if (!mission) throw new NotFoundException('Mission not found');
    return mission;
  }

  @Post('missions')
  async createDbMission(@Body() dto: CreateDbMissionDto, @CurrentUser() user: { id: string }) {
    return this.coordService.createDbMission({
      name: dto.name,
      description: dto.description,
      projectId: dto.projectId,
      userId: user.id,
      phase: dto.phase,
      milestones: dto.milestones,
      config: dto.config,
      status: dto.status,
    });
  }

  @Patch('missions/:id')
  async updateDbMission(
    @Param('id') id: string,
    @Body() dto: UpdateDbMissionDto,
    @CurrentUser() user: { id: string },
  ) {
    const mission = await this.coordService.updateDbMission(id, user.id, dto);
    if (!mission) throw new NotFoundException('Mission not found');
    return mission;
  }

  @Delete('missions/:id')
  @HttpCode(HttpStatus.NO_CONTENT)
  async deleteDbMission(@Param('id') id: string, @CurrentUser() user: { id: string }) {
    const deleted = await this.coordService.deleteDbMission(id, user.id);
    if (!deleted) throw new NotFoundException('Mission not found');
  }

  // ── DB-backed mission task endpoints ──

  @Get('missions/:missionId/mission-tasks')
  async listMissionTasks(
    @Param('missionId') missionId: string,
    @CurrentUser() user: { id: string },
  ) {
    const mission = await this.coordService.getMissionByIdAndUser(missionId, user.id);
    if (!mission) throw new NotFoundException('Mission not found');
    return this.coordService.getMissionTasksByMissionAndUser(missionId, user.id);
  }

  @Get('missions/:missionId/mission-tasks/:taskId')
  async getMissionTask(
    @Param('missionId') missionId: string,
    @Param('taskId') taskId: string,
    @CurrentUser() user: { id: string },
  ) {
    const mission = await this.coordService.getMissionByIdAndUser(missionId, user.id);
    if (!mission) throw new NotFoundException('Mission not found');
    const task = await this.coordService.getMissionTaskByIdAndUser(taskId, user.id);
    if (!task) throw new NotFoundException('Mission task not found');
    return task;
  }

  @Post('missions/:missionId/mission-tasks')
  async createMissionTask(
    @Param('missionId') missionId: string,
    @Body() dto: CreateMissionTaskDto,
    @CurrentUser() user: { id: string },
  ) {
    const mission = await this.coordService.getMissionByIdAndUser(missionId, user.id);
    if (!mission) throw new NotFoundException('Mission not found');
    return this.coordService.createMissionTask({
      missionId,
      taskId: dto.taskId,
      userId: user.id,
      status: dto.status,
      description: dto.description,
      notes: dto.notes,
      pr: dto.pr,
    });
  }

  @Patch('missions/:missionId/mission-tasks/:taskId')
  async updateMissionTask(
    @Param('missionId') missionId: string,
    @Param('taskId') taskId: string,
    @Body() dto: UpdateMissionTaskDto,
    @CurrentUser() user: { id: string },
  ) {
    const mission = await this.coordService.getMissionByIdAndUser(missionId, user.id);
    if (!mission) throw new NotFoundException('Mission not found');
    const updated = await this.coordService.updateMissionTask(taskId, user.id, dto);
    if (!updated) throw new NotFoundException('Mission task not found');
    return updated;
  }

  @Delete('missions/:missionId/mission-tasks/:taskId')
  @HttpCode(HttpStatus.NO_CONTENT)
  async deleteMissionTask(
    @Param('missionId') missionId: string,
    @Param('taskId') taskId: string,
    @CurrentUser() user: { id: string },
  ) {
    const mission = await this.coordService.getMissionByIdAndUser(missionId, user.id);
    if (!mission) throw new NotFoundException('Mission not found');
    const deleted = await this.coordService.deleteMissionTask(taskId, user.id);
    if (!deleted) throw new NotFoundException('Mission task not found');
  }
}