import { requestJson } from './api.uts'
import { wanAmountValid, wanToCents } from './money.uts'

export type FinancingPurpose = { type: string, code: string, label: string, requiresDetail: boolean }

// 用途由服务端发布；加载失败时提示重试，不用本机猜测字典后提交。
export async function fetchFinancingPurposes(): Promise<FinancingPurpose[]> {
    const result = await requestJson('/dictionaries', 'GET', {})
    const versions = result['assessmentInputVersions'] as number[] | null
    const minimum = result['minNewAssessmentInputVersion'] as number | null
    if (versions == null || !versions.includes(2) || minimum == null || minimum > 2) throw new Error('评估版本已更新，请刷新页面后重试')
    const dictionary = result['financingPurposes'] as UTSJSONObject | null
    if (dictionary == null) throw new Error('资金用途暂不可用，请重试')
    const items = dictionary['items'] as UTSJSONObject[] | null
    if (items == null) throw new Error('资金用途暂不可用，请重试')
    const purposes: FinancingPurpose[] = []
    items.forEach((item: UTSJSONObject) => {
        if (item['enabled'] == true) purposes.push({ type: item['type'] as string, code: item['code'] as string, label: item['label'] as string, requiresDetail: item['requiresDetail'] == true } as FinancingPurpose)
    })
    if (purposes.length == 0) throw new Error('资金用途暂不可用，请重试')
    return purposes
}

export function demandValidationMessage(amount: string, term: string, code: string, detail: string): string {
    if (!wanAmountValid(amount) || wanToCents(amount) <= 0) return '请填写大于零的融资金额（万元，最多六位小数）'
    if (!/^[1-9][0-9]{0,3}$/.test(term)) return '融资期限请输入1至9999的整数月'
    if (code.length == 0) return '请选择资金用途'
    if (code == 'other' && (detail.trim().length < 2 || detail.trim().length > 200 || /[<>\x00-\x1f\x7f]/.test(detail))) return '其他用途请填写2至200字说明，不含标签或控制字符'
    if (code != 'other' && detail.length > 0) return '仅其他用途需要填写说明'
    return ''
}