import { Injectable } from '@nestjs/common';
import { ExamsService } from '../../exams/exams.service';
import { AgentBusinessScopeFactory } from '../agent-business-scope.factory';
import type { AgentToolContext, ToolDef, ToolInputResult } from '../agent-tool.types';
import { optionalPositiveInt, optionalString, rejectUnknownKeys } from './tool-input';

interface Input { keyword?: string; examType?: string; classId?: number; limit?: number }

@Injectable()
export class SearchExamsTool implements ToolDef<Input> {
  readonly name = 'search_exams';
  readonly skillKey = 'student';
  readonly description = '查询当前用户有权查看的考试及成绩录入进度（考试名称、类型、日期、班级、应录/已录人数）。';
  readonly requiredPermission = 'exam:view';
  readonly inputSchema = {
    type: 'object',
    properties: {
      keyword: { type: 'string', maxLength: 100, description: '考试名称关键词' },
      examType: { type: 'string', maxLength: 50, description: '考试类型' },
      classId: { type: 'integer', minimum: 1, description: '班级ID' },
      limit: { type: 'integer', minimum: 1, maximum: 50 },
    },
    additionalProperties: false,
  };
  constructor(
    private readonly service: ExamsService,
    private readonly scopes: AgentBusinessScopeFactory,
  ) {}

  validate(raw: Record<string, unknown>): ToolInputResult<Input> {
    const invalid = rejectUnknownKeys(raw, ['keyword', 'examType', 'classId', 'limit']);
    if (invalid) return invalid;
    const keyword = optionalString(raw.keyword, 'keyword', 100); if (!keyword.ok) return keyword;
    const examType = optionalString(raw.examType, 'examType', 50); if (!examType.ok) return examType;
    const classId = optionalPositiveInt(raw.classId, 'classId'); if (!classId.ok) return classId;
    const limit = optionalPositiveInt(raw.limit, 'limit', 50); if (!limit.ok) return limit;
    return {
      ok: true,
      value: { keyword: keyword.value, examType: examType.value, classId: classId.value, limit: limit.value },
    };
  }

  execute(input: Input, context: AgentToolContext) {
    return this.service.agentSearchExams(
      context.userId,
      this.scopes.canManageAllClasses(context),
      input,
    );
  }
}