'use client';

import { useState, useEffect } from 'react';
import { Box, Typography, CircularProgress, Alert } from '@mui/material';
import {
  LineChart,
  Line,
  BarChart,
  Bar,
  XAxis,
  YAxis,
  CartesianGrid,
  Tooltip,
  Legend,
  ResponsiveContainer,
} from 'recharts';
import { format, subDays } from 'date-fns';
import apiClient from '@/lib/api/client';

interface SleepData {
  date: string;
  totalHours: number;
  nightSleep: number;
  naps: number;
  quality: number;
}

export default function WeeklySleepChart() {
  const [data, setData] = useState<SleepData[]>([]);
  const [isLoading, setIsLoading] = useState(true);
  const [error, setError] = useState<string | null>(null);

  useEffect(() => {
    fetchSleepData();
  }, []);

  const fetchSleepData = async () => {
    try {
      setIsLoading(true);
      const endDate = new Date();
      const startDate = subDays(endDate, 6);

      const response = await apiClient.get('/api/v1/activities/sleep', {
        params: {
          startDate: startDate.toISOString(),
          endDate: endDate.toISOString(),
        },
      });

      // Process the data to aggregate by day
      const sleepActivities = response.data.data;
      const dailyData: { [key: string]: SleepData } = {};

      // Initialize 7 days of data
      for (let i = 0; i < 7; i++) {
        const date = subDays(endDate, 6 - i);
        const dateStr = format(date, 'MMM dd');
        dailyData[dateStr] = {
          date: dateStr,
          totalHours: 0,
          nightSleep: 0,
          naps: 0,
          quality: 0,
        };
      }

      // Aggregate sleep data by day
      sleepActivities.forEach((activity: any) => {
        const dateStr = format(new Date(activity.startTime), 'MMM dd');
        if (dailyData[dateStr]) {
          const duration = activity.duration || 0;
          const hours = duration / 60; // Convert minutes to hours

          dailyData[dateStr].totalHours += hours;

          // Determine if it's night sleep or nap based on time
          const hour = new Date(activity.startTime).getHours();
          if (hour >= 18 || hour < 6) {
            dailyData[dateStr].nightSleep += hours;
          } else {
            dailyData[dateStr].naps += hours;
          }

          // Average quality
          if (activity.quality) {
            dailyData[dateStr].quality =
              (dailyData[dateStr].quality + activity.quality) / 2;
          }
        }
      });

      // Round values for display
      const chartData = Object.values(dailyData).map((day) => ({
        ...day,
        totalHours: Math.round(day.totalHours * 10) / 10,
        nightSleep: Math.round(day.nightSleep * 10) / 10,
        naps: Math.round(day.naps * 10) / 10,
        quality: Math.round(day.quality * 10) / 10,
      }));

      setData(chartData);
    } catch (err: any) {
      console.error('Failed to fetch sleep data:', err);
      setError(err.response?.data?.message || 'Failed to load sleep data');
    } finally {
      setIsLoading(false);
    }
  };

  if (isLoading) {
    return (
      <Box sx={{ display: 'flex', justifyContent: 'center', py: 4 }}>
        <CircularProgress />
      </Box>
    );
  }

  if (error) {
    return (
      <Alert severity="error" sx={{ borderRadius: 2 }}>
        {error}
      </Alert>
    );
  }

  return (
    <Box>
      <Typography variant="h6" gutterBottom fontWeight="600">
        Weekly Sleep Patterns
      </Typography>
      <Typography variant="body2" color="text.secondary" sx={{ mb: 3 }}>
        Track your child's sleep duration and quality over the past 7 days
      </Typography>

      {/* Total Sleep Hours Chart */}
      <Box sx={{ mb: 4 }}>
        <Typography variant="subtitle1" gutterBottom fontWeight="600">
          Total Sleep Hours
        </Typography>
        <ResponsiveContainer width="100%" height={300}>
          <BarChart data={data}>
            <CartesianGrid strokeDasharray="3 3" stroke="#f0f0f0" />
            <XAxis dataKey="date" stroke="#666" />
            <YAxis stroke="#666" label={{ value: 'Hours', angle: -90, position: 'insideLeft' }} />
            <Tooltip
              contentStyle={{
                backgroundColor: 'rgba(255, 255, 255, 0.95)',
                border: 'none',
                borderRadius: 8,
                boxShadow: '0 4px 6px rgba(0, 0, 0, 0.1)',
              }}
            />
            <Legend />
            <Bar dataKey="nightSleep" stackId="a" fill="#B6D7FF" name="Night Sleep" />
            <Bar dataKey="naps" stackId="a" fill="#A5C9FF" name="Naps" />
          </BarChart>
        </ResponsiveContainer>
      </Box>

      {/* Sleep Quality Trend */}
      <Box>
        <Typography variant="subtitle1" gutterBottom fontWeight="600">
          Sleep Quality Trend
        </Typography>
        <ResponsiveContainer width="100%" height={250}>
          <LineChart data={data}>
            <CartesianGrid strokeDasharray="3 3" stroke="#f0f0f0" />
            <XAxis dataKey="date" stroke="#666" />
            <YAxis
              stroke="#666"
              domain={[0, 5]}
              label={{ value: 'Quality (1-5)', angle: -90, position: 'insideLeft' }}
            />
            <Tooltip
              contentStyle={{
                backgroundColor: 'rgba(255, 255, 255, 0.95)',
                border: 'none',
                borderRadius: 8,
                boxShadow: '0 4px 6px rgba(0, 0, 0, 0.1)',
              }}
            />
            <Legend />
            <Line
              type="monotone"
              dataKey="quality"
              stroke="#B6D7FF"
              strokeWidth={3}
              dot={{ fill: '#B6D7FF', r: 5 }}
              name="Quality"
            />
          </LineChart>
        </ResponsiveContainer>
      </Box>
    </Box>
  );
}