import { Injectable, Logger } from '@nestjs/common';
import {
  loadMission,
  getMissionStatus,
  getTaskStatus,
  parseTasksFile,
  type Mission,
  type MissionStatusSummary,
  type MissionTask,
  type TaskDetail,
} from '@mosaicstack/coord';
import { promises as fs } from 'node:fs';
import path from 'node:path';

/**
 * File-based coord operations for agent tool consumption.
 * DB-backed mission CRUD is handled directly by MissionsController via Brain repos.
 */
@Injectable()
export class CoordService {
  private readonly logger = new Logger(CoordService.name);

  async loadMission(projectPath: string): Promise<Mission | null> {
    try {
      return await loadMission(projectPath);
    } catch (err) {
      this.logger.debug(
        `No coord mission at ${projectPath}: ${err instanceof Error ? err.message : String(err)}`,
      );
      return null;
    }
  }

  async getMissionStatus(projectPath: string): Promise<MissionStatusSummary | null> {
    const mission = await this.loadMission(projectPath);
    if (!mission) return null;

    try {
      return await getMissionStatus(mission);
    } catch (err) {
      this.logger.error(
        `Failed to get mission status: ${err instanceof Error ? err.message : String(err)}`,
      );
      return null;
    }
  }

  async getTaskStatus(projectPath: string, taskId: string): Promise<TaskDetail | null> {
    const mission = await this.loadMission(projectPath);
    if (!mission) return null;

    try {
      return await getTaskStatus(mission, taskId);
    } catch (err) {
      this.logger.error(
        `Failed to get task status for ${taskId}: ${err instanceof Error ? err.message : String(err)}`,
      );
      return null;
    }
  }

  async listTasks(projectPath: string): Promise<MissionTask[]> {
    const mission = await this.loadMission(projectPath);
    if (!mission) return [];

    const tasksFile = path.isAbsolute(mission.tasksFile)
      ? mission.tasksFile
      : path.join(mission.projectPath, mission.tasksFile);

    try {
      const content = await fs.readFile(tasksFile, 'utf8');
      return parseTasksFile(content);
    } catch {
      return [];
    }
  }
}