import { getSession } from '@/services/api.uts'
import { validRecordId, MatchDetail, MatchReason } from './matches.uts'

let scope = ''
let selected: string[] = []

export function parseCompareIds(raw: string): string[] {
    if (raw.length == 0) return []
    const ids = raw.split(',')
    if (ids.length > 3) throw new Error('每次最多对比3个产品，请返回重新选择。')
    const seen: string[] = []
    ids.forEach((id: string) => {
        if (!validRecordId(id) || seen.includes(id)) throw new Error('对比产品编号无效或重复，请返回重新选择。')
        seen.push(id)
    })
    return ids
}

// 只缓存少量选择ID，不持久化产品或个人事实；换账号、会话或评估后立即隔离。
export function compareSelection(assessmentId: string): string[] {
    const session = getSession()
    const key = session == null ? '' : (session.getString('userId') ?? '') + ':' + (session.getString('token') ?? '') + ':' + assessmentId
    if (key != scope || key.length == 0) { scope = key; selected = [] }
    return selected.slice()
}
export function saveCompareSelection(assessmentId: string, ids: string[]): void {
    compareSelection(assessmentId)
    selected = parseCompareIds(ids.join(','))
}
export function compareQuery(assessmentId: string, ids: string[]): string {
    return '?assessmentId=' + encodeURIComponent(assessmentId) + '&productIds=' + ids.join(',')
}
export function sameMatchSnapshot(a: MatchDetail, b: MatchDetail): boolean {
    return a.assessmentId == b.assessmentId && a.resultVersion == b.resultVersion && a.snapshotId == b.snapshotId && a.ruleVersion == b.ruleVersion && a.orderingVersion == b.orderingVersion
}
export function compareReasonText(reasons: MatchReason[], empty: string): string {
    return reasons.length == 0 ? empty : reasons.map((r: MatchReason): string => r.text + '\n' + r.evidence.join('\n')).join('\n\n')
}