/**
 * 时间范围验证器
 * 检查当前时间是否在指定的时间范围内（支持工作日限制）
 */
class TimeRangeValidator {
    /**
     * 检查当前时间是否在指定的时间范围内
     * @param {object} timeRange - 时间范围配置 {start_time: '09:00', end_time: '18:00', workdays_only: 1}
     * @returns {{allowed: boolean, reason: string}} 检查结果
     */
    static checkTimeRange(timeRange) {
        if (!timeRange || !timeRange.start_time || !timeRange.end_time) {
            return { allowed: true, reason: '未配置时间范围' };
        }

        const now = new Date();
        const currentHour = now.getHours();
        const currentMinute = now.getMinutes();
        const currentTime = currentHour * 60 + currentMinute; // 转换为分钟数

        // 解析开始时间和结束时间
        const [startHour, startMinute] = timeRange.start_time.split(':').map(Number);
        const [endHour, endMinute] = timeRange.end_time.split(':').map(Number);
        const startTime = startHour * 60 + startMinute;
        const endTime = endHour * 60 + endMinute;

        // 检查是否仅工作日（使用宽松比较，兼容字符串和数字）
        if (timeRange.workdays_only == 1) {
            const dayOfWeek = now.getDay(); // 0=周日, 1=周一, ..., 6=周六
            if (dayOfWeek === 0 || dayOfWeek === 6) {
                return { allowed: false, reason: '当前是周末，不在允许的时间范围内' };
            }
        }

        // 检查当前时间是否在时间范围内
        if (startTime <= endTime) {
            // 正常情况：09:00 - 18:00
            if (currentTime < startTime || currentTime >= endTime) {
                const currentTimeStr = `${now.getHours().toString().padStart(2, '0')}:${now.getMinutes().toString().padStart(2, '0')}`;
                return {
                    allowed: false,
                    reason: `当前时间 ${currentTimeStr} 不在允许的时间范围内 (${timeRange.start_time} - ${timeRange.end_time})`
                };
            }
        } else {
            // 跨天情况：22:00 - 06:00
            if (currentTime < startTime && currentTime >= endTime) {
                const currentTimeStr = `${now.getHours().toString().padStart(2, '0')}:${now.getMinutes().toString().padStart(2, '0')}`;
                return {
                    allowed: false,
                    reason: `当前时间 ${currentTimeStr} 不在允许的时间范围内 (${timeRange.start_time} - ${timeRange.end_time})`
                };
            }
        }

        return { allowed: true, reason: '在允许的时间范围内' };
    }

    /**
     * 检查是否在工作时间内
     * @param {string} startTime - 开始时间 '09:00'
     * @param {string} endTime - 结束时间 '18:00'
     * @returns {boolean}
     */
    static isWithinWorkingHours(startTime = '09:00', endTime = '18:00') {
        const result = this.checkTimeRange({
            start_time: startTime,
            end_time: endTime,
            workdays_only: 0
        });
        return result.allowed;
    }

    /**
     * 检查是否是工作日
     * @returns {boolean}
     */
    static isWorkingDay() {
        const dayOfWeek = new Date().getDay();
        return dayOfWeek !== 0 && dayOfWeek !== 6; // 非周六周日
    }

    /**
     * 获取下一个可操作时间
     * @param {object} timeRange - 时间范围配置
     * @returns {Date|null} 下一个可操作时间，如果当前可操作则返回 null
     */
    static getNextAvailableTime(timeRange) {
        const check = this.checkTimeRange(timeRange);
        if (check.allowed) {
            return null; // 当前可操作
        }

        if (!timeRange || !timeRange.start_time) {
            return null;
        }

        const now = new Date();
        const [startHour, startMinute] = timeRange.start_time.split(':').map(Number);

        // 如果是工作日限制且当前是周末
        if (timeRange.workdays_only == 1) {
            const dayOfWeek = now.getDay();
            if (dayOfWeek === 0) {
                // 周日，下一个可操作时间是周一
                const nextTime = new Date(now);
                nextTime.setDate(now.getDate() + 1);
                nextTime.setHours(startHour, startMinute, 0, 0);
                return nextTime;
            } else if (dayOfWeek === 6) {
                // 周六，下一个可操作时间是下周一
                const nextTime = new Date(now);
                nextTime.setDate(now.getDate() + 2);
                nextTime.setHours(startHour, startMinute, 0, 0);
                return nextTime;
            }
        }

        // 计算下一个开始时间
        const nextTime = new Date(now);
        nextTime.setHours(startHour, startMinute, 0, 0);

        // 如果已经过了今天的开始时间，则设置为明天
        if (nextTime <= now) {
            nextTime.setDate(now.getDate() + 1);
        }

        return nextTime;
    }

    /**
     * 格式化剩余时间
     * @param {object} timeRange - 时间范围配置
     * @returns {string} 剩余时间描述
     */
    static formatRemainingTime(timeRange) {
        const nextTime = this.getNextAvailableTime(timeRange);
        if (!nextTime) {
            return '当前可操作';
        }

        const now = Date.now();
        const diff = nextTime.getTime() - now;
        const hours = Math.floor(diff / (1000 * 60 * 60));
        const minutes = Math.floor((diff % (1000 * 60 * 60)) / (1000 * 60));

        if (hours > 24) {
            const days = Math.floor(hours / 24);
            return `需要等待 ${days} 天 ${hours % 24} 小时`;
        } else if (hours > 0) {
            return `需要等待 ${hours} 小时 ${minutes} 分钟`;
        } else {
            return `需要等待 ${minutes} 分钟`;
        }
    }
}

module.exports = TimeRangeValidator;