// @ts-nocheck


export const EMP_RE = /emp_[a-z0-9]+/i;

const CN_NUM_MAP = {
    '一': 1, '二': 2, '三': 3, '四': 4, '五': 5,
    '六': 6, '七': 7, '八': 8, '九': 9, '十': 10,
};

const INDEX_RE = /(?:第\s*|选\s*|选第\s*)?([一二三四五六七八九十\d]+)\s*[号个]?\s*/;

export function validateCandidateSelection(aiResponse, candidates) {
    if (!aiResponse || typeof aiResponse !== 'string') {
        return { valid: false, reason: 'NO_AI_RESPONSE' };
    }
    if (!Array.isArray(candidates) || candidates.length === 0) {
        return { valid: false, reason: 'NO_CANDIDATES' };
    }

    
    const validIds = candidates
        .map(c => (typeof c === 'string' ? c : c?.employeeId))
        .filter(Boolean)
        .map(id => id.toLowerCase());

    
    const empMatch = aiResponse.match(EMP_RE);
    if (empMatch) {
        const empId = empMatch[0].toLowerCase();
        if (validIds.includes(empId)) {
            return { valid: true, employeeId: empId };
        }
        return {
            valid: false,
            reason: 'EMP_NOT_IN_CANDIDATES',
            attempted: empId,
            validIds,
        };
    }

    
    const numMatch = aiResponse.match(INDEX_RE);
    if (numMatch) {
        const raw = numMatch[1];
        const idx = /^\d+$/.test(raw)
            ? parseInt(raw, 10)
            : CN_NUM_MAP[raw];
        if (idx == null) {
            return { valid: false, reason: 'UNRECOGNIZED_FORMAT' };
        }
        if (idx >= 1 && idx <= validIds.length) {
            return { valid: true, employeeId: validIds[idx - 1] };
        }
        return {
            valid: false,
            reason: 'INDEX_OUT_OF_RANGE',
            index: idx,
            total: validIds.length,
        };
    }

    return { valid: false, reason: 'UNRECOGNIZED_FORMAT' };
}

export function formatValidationFailure(result) {
    if (!result || result.valid) return '';
    switch (result.reason) {
        case 'INDEX_OUT_OF_RANGE':
            return `序号 ${result.index} 越界(共 ${result.total} 个候选)。请用户从 1-${result.total} 中选择,或在候选表里指出特征(如「乘务二组那个」)。`;
        case 'EMP_NOT_IN_CANDIDATES':
            return `引用的员工 ID「${result.attempted}」不在当前候选列表内。请用户从候选列表中重新选择(候选:${result.validIds?.join(', ')})。`;
        case 'UNRECOGNIZED_FORMAT':
            return `未识别用户的选择。请用户回复「序号」(如「1 号」),或直接说班组/岗位特征(如「乘务二组那个」)。`;
        case 'NO_CANDIDATES':
            return `当前没有候选列表,请用户先重新发起查询。`;
        case 'NO_AI_RESPONSE':
            return `AI 回复为空,无法识别选择。`;
        default:
            return `选择无效,请用户重新选择。`;
    }
}