/** 将接口 msg / 异常对象转为可展示的字符串，避免 [object Object] */
export function formatUserMessage(msg, fallback = '') {
    if (msg == null || msg === '') return fallback
    if (typeof msg === 'string') return msg
    if (typeof msg === 'number' || typeof msg === 'boolean') return String(msg)
    if (Array.isArray(msg)) {
        const parts = msg.map((item) => {
            if (item == null) return ''
            if (typeof item === 'string') return item
            if (typeof item === 'number' || typeof item === 'boolean') return String(item)
            if (typeof item === 'object') {
                return item.msg || item.message || item.error || item.title || item.label || ''
            }
            return String(item)
        }).filter(Boolean)
        return parts.length ? parts.join('；') : fallback
    }
    if (typeof msg === 'object') {
        return msg.msg || msg.message || msg.error || msg.title || msg.label || fallback
    }
    return String(msg)
}

export function showUserToast(title, options = {}) {
    const text = formatUserMessage(title, '')
    if (!text) return
    uni.showToast({
        title: text,
        icon: options.icon || 'none',
        duration: options.duration
    })
}

export function formatDate(date) {
    const y = date.getFullYear()
    const m = String(date.getMonth() + 1).padStart(2, '0')
    const d = String(date.getDate()).padStart(2, '0')
    return `${y}-${m}-${d}`
}

export function parseDate(str) {
    if (!str) return new Date()
    const [y, m, d] = str.split('-').map(Number)
    return new Date(y, (m || 1) - 1, d || 1)
}

export function toNumber(v) {
    if (v === null || v === undefined || v === '') return null
    const n = Number(v)
    return Number.isFinite(n) && n !== 0 ? n : null
}

export function getWeekday(dateStr) {
    const w = ['周日', '周一', '周二', '周三', '周四', '周五', '周六']
    return w[parseDate(dateStr).getDay()]
}