// Time utilities for handling business day logic and time ranges
// Business day is 1am-12:59am Eastern time (UTC-5)

const getBusinessDayBounds = (timeRange) => {
  const now = new Date();
  const easternTime = new Date(now.getTime() - (5 * 60 * 60 * 1000)); // UTC-5
  
  switch (timeRange) {
    case 'today': {
      const start = new Date(easternTime);
      start.setHours(1, 0, 0, 0); // 1 AM start of business day
      
      const end = new Date(start);
      end.setDate(end.getDate() + 1);
      end.setHours(0, 59, 59, 999); // 12:59 AM next day
      
      return { start, end };
    }
    
    case 'yesterday': {
      const start = new Date(easternTime);
      start.setDate(start.getDate() - 1);
      start.setHours(1, 0, 0, 0);
      
      const end = new Date(start);
      end.setDate(end.getDate() + 1);
      end.setHours(0, 59, 59, 999);
      
      return { start, end };
    }
    
    case 'thisWeek': {
      const start = new Date(easternTime);
      start.setDate(easternTime.getDate() - easternTime.getDay()); // Sunday
      start.setHours(1, 0, 0, 0);
      
      const end = new Date(easternTime);
      end.setDate(end.getDate() + 1);
      end.setHours(0, 59, 59, 999);
      
      return { start, end };
    }
    
    case 'lastWeek': {
      const start = new Date(easternTime);
      start.setDate(easternTime.getDate() - easternTime.getDay() - 7); // Previous Sunday
      start.setHours(1, 0, 0, 0);
      
      const end = new Date(start);
      end.setDate(end.getDate() + 7);
      end.setHours(0, 59, 59, 999);
      
      return { start, end };
    }
    
    case 'thisMonth': {
      const start = new Date(easternTime.getFullYear(), easternTime.getMonth(), 1, 1, 0, 0, 0);
      const end = new Date(easternTime);
      end.setDate(end.getDate() + 1);
      end.setHours(0, 59, 59, 999);
      
      return { start, end };
    }
    
    case 'lastMonth': {
      const start = new Date(easternTime.getFullYear(), easternTime.getMonth() - 1, 1, 1, 0, 0, 0);
      const end = new Date(easternTime.getFullYear(), easternTime.getMonth(), 1, 0, 59, 59, 999);
      
      return { start, end };
    }
    
    case 'last7days': {
      const end = new Date(easternTime);
      end.setHours(0, 59, 59, 999);
      
      const start = new Date(end);
      start.setDate(start.getDate() - 7);
      start.setHours(1, 0, 0, 0);
      
      return { start, end };
    }
    
    case 'last30days': {
      const end = new Date(easternTime);
      end.setHours(0, 59, 59, 999);
      
      const start = new Date(end);
      start.setDate(start.getDate() - 30);
      start.setHours(1, 0, 0, 0);
      
      return { start, end };
    }
    
    case 'last90days': {
      const end = new Date(easternTime);
      end.setHours(0, 59, 59, 999);
      
      const start = new Date(end);
      start.setDate(start.getDate() - 90);
      start.setHours(1, 0, 0, 0);
      
      return { start, end };
    }
    
    case 'previous7days': {
      const end = new Date(easternTime);
      end.setDate(end.getDate() - 1);
      end.setHours(0, 59, 59, 999);
      
      const start = new Date(end);
      start.setDate(start.getDate() - 6);
      start.setHours(1, 0, 0, 0);
      
      return { start, end };
    }
    
    case 'previous30days': {
      const end = new Date(easternTime);
      end.setDate(end.getDate() - 1);
      end.setHours(0, 59, 59, 999);
      
      const start = new Date(end);
      start.setDate(start.getDate() - 29);
      start.setHours(1, 0, 0, 0);
      
      return { start, end };
    }
    
    case 'previous90days': {
      const end = new Date(easternTime);
      end.setDate(end.getDate() - 1);
      end.setHours(0, 59, 59, 999);
      
      const start = new Date(end);
      start.setDate(start.getDate() - 89);
      start.setHours(1, 0, 0, 0);
      
      return { start, end };
    }
    
    case 'twoDaysAgo': {
      const start = new Date(easternTime);
      start.setDate(start.getDate() - 2);
      start.setHours(1, 0, 0, 0);
      
      const end = new Date(start);
      end.setDate(end.getDate() + 1);
      end.setHours(0, 59, 59, 999);
      
      return { start, end };
    }
    
    default:
      throw new Error(`Unknown time range: ${timeRange}`);
  }
};

const getTimeRangeConditions = (timeRange, startDate, endDate) => {
  if (timeRange === 'custom' && startDate && endDate) {
    // Custom date range
    const start = new Date(startDate);
    const end = new Date(endDate);
    
    // Convert to UTC-5 (Eastern time)
    const startUTC5 = new Date(start.getTime() - (5 * 60 * 60 * 1000));
    const endUTC5 = new Date(end.getTime() - (5 * 60 * 60 * 1000));
    
    return {
      whereClause: 'date_placed >= ? AND date_placed <= ?',
      params: [
        startUTC5.toISOString().slice(0, 19).replace('T', ' '),
        endUTC5.toISOString().slice(0, 19).replace('T', ' ')
      ],
      dateRange: {
        start: startDate,
        end: endDate,
        label: `${formatBusinessDate(start)} - ${formatBusinessDate(end)}`
      }
    };
  }
  
  if (!timeRange) {
    timeRange = 'today';
  }
  
  const { start, end } = getBusinessDayBounds(timeRange);
  
  // Convert to MySQL datetime format (UTC-5)
  const startStr = start.toISOString().slice(0, 19).replace('T', ' ');
  const endStr = end.toISOString().slice(0, 19).replace('T', ' ');
  
  return {
    whereClause: 'date_placed >= ? AND date_placed <= ?',
    params: [startStr, endStr],
    dateRange: {
      start: start.toISOString(),
      end: end.toISOString(),
      label: getTimeRangeLabel(timeRange)
    }
  };
};

const formatBusinessDate = (date) => {
  return date.toLocaleDateString('en-US', {
    month: 'short',
    day: 'numeric',
    year: 'numeric'
  });
};

const getTimeRangeLabel = (timeRange) => {
  const labels = {
    today: 'Today',
    yesterday: 'Yesterday',
    thisWeek: 'This Week',
    lastWeek: 'Last Week',
    thisMonth: 'This Month',
    lastMonth: 'Last Month',
    last7days: 'Last 7 Days',
    last30days: 'Last 30 Days',
    last90days: 'Last 90 Days',
    previous7days: 'Previous 7 Days',
    previous30days: 'Previous 30 Days',
    previous90days: 'Previous 90 Days',
    twoDaysAgo: 'Two Days Ago'
  };
  
  return labels[timeRange] || timeRange;
};

// Helper to convert MySQL datetime to JavaScript Date
const parseBusinessDate = (mysqlDatetime) => {
  if (!mysqlDatetime || mysqlDatetime === '0000-00-00 00:00:00') {
    return null;
  }
  
  // MySQL datetime is stored in UTC-5, so we need to add 5 hours to get UTC
  const date = new Date(mysqlDatetime + ' UTC');
  date.setHours(date.getHours() + 5);
  return date;
};

// Helper to format date for MySQL queries
const formatMySQLDate = (date) => {
  if (!date) return null;
  
  // Convert to UTC-5 for storage
  const utc5Date = new Date(date.getTime() - (5 * 60 * 60 * 1000));
  return utc5Date.toISOString().slice(0, 19).replace('T', ' ');
};

module.exports = {
  getBusinessDayBounds,
  getTimeRangeConditions,
  formatBusinessDate,
  getTimeRangeLabel,
  parseBusinessDate,
  formatMySQLDate
};