export function getRule(rule) {
	if ('required' in rule) {
		return { type: 'required', value: rule.required }
	}
	if ('max' in rule || 'min' in rule) {
		return { type: 'between', value: [rule.min, rule.max] }
	}
	if ('validator' in rule) {
		return { type: 'validator', value: rule.validator }
	}
	if ('pattern' in rule) {
		return { type: 'pattern', value: rule.pattern }
	}
}

export function filterRules(rules) {
	return rules.filter(rule => {
		const { type, value } = getRule(rule)
		return value
	})
}

export function combineRule(rules) {
	return filterRules(rules).map(rule => {
		const { message = '' } = rule
		const { type, value } = getRule(rule)
		return { message, type, value }
	})
}

function isVariableEmpty(variable) {
	// 判断变量是否为null或undefined
	if (variable == null) {
		return true
	}

	// 判断字符串是否为空
	if (typeof variable === 'string' && variable.trim().length === 0) {
		return true
	}

	// 判断数组是否为空
	if (Array.isArray(variable) && variable.length === 0) {
		return true
	}

	// 判断对象是否为空
	if (typeof variable === 'object' && Object.keys(variable).length === 0) {
		return true
	}

	return false
}

const validationRules = {
	required(rule, value, model) {
		return !isVariableEmpty(value)
	},
	pattern(rule, value, model) {
		return rule.test(value, model)
	},
	between(rule, value, model) {
		const [min = null, max = null] = rule
		if (min !== null && max !== null) return (Number(value) >= min && Number(value) <= max)
		if (min !== null && max === null) return Number(value) >= min
		if (max !== null && min === null) return Number(value) <= max
	},
	validator(rule, value, model) { // 自定义验证
		return rule(value, model)
	}
}
export { validationRules }