/**
 * RoutePlansController
 *
 * Routes:
 *   POST /api/missions/:missionId/route-plan   — trigger route plan generation (202)
 *   GET  /api/missions/:missionId/route-plan   — get latest non-superseded route plan
 *
 * Idempotency-Key header is accepted on POST and forwarded to the workflow
 * (CLAUDE.md #7 — idempotent writes).
 */
import {
  Controller,
  Get,
  Headers,
  HttpCode,
  HttpStatus,
  Inject,
  Param,
  Post,
  UseGuards,
  NotFoundException,
  ForbiddenException,
} from "@nestjs/common";
import { eq } from "drizzle-orm";
import { schema, type Database } from "@courtmitra/db";
import { RoutePlansService } from "./route-plans.service.js";
import { DB } from "../db/db.module.js";
import { CurrentUser } from "../auth/current-user.decorator.js";
import { ClerkAuthGuard } from "../auth/clerk-auth.guard.js";

@UseGuards(ClerkAuthGuard)
@Controller("missions/:missionId/route-plan")
export class RoutePlansController {
  constructor(
    @Inject(RoutePlansService) private readonly routePlans: RoutePlansService,
    @Inject(DB) private readonly db: Database,
  ) {}

  /** Verify the mission belongs to the requesting user. */
  private async assertMissionOwnership(missionId: string, userId: string) {
    const [missionRow] = await this.db
      .select({ userId: schema.missions.userId })
      .from(schema.missions)
      .where(eq(schema.missions.id, missionId))
      .limit(1);
    if (!missionRow) throw new NotFoundException(`Mission not found: ${missionId}`);
    if (missionRow.userId !== userId) throw new ForbiddenException("You do not own this mission");
  }

  @Post()
  @HttpCode(HttpStatus.ACCEPTED)
  async trigger(
    @Param("missionId") missionId: string,
    @CurrentUser() userId: string,
    @Headers("idempotency-key") idempotencyKey?: string,
  ) {
    await this.assertMissionOwnership(missionId, userId);
    return this.routePlans.trigger(missionId, idempotencyKey);
  }

  @Get()
  async getLatest(@Param("missionId") missionId: string, @CurrentUser() userId: string) {
    await this.assertMissionOwnership(missionId, userId);
    return this.routePlans.getLatest(missionId);
  }
}