'use client';

import { useState } from 'react';
import {
  Box,
  Typography,
  Button,
  Paper,
  TextField,
  IconButton,
  Alert,
  Chip,
  FormControl,
  FormLabel,
  RadioGroup,
  FormControlLabel,
  Radio,
  ToggleButtonGroup,
  ToggleButton,
} from '@mui/material';
import {
  ArrowBack,
  Save,
  Mic,
  BabyChangingStation,
} from '@mui/icons-material';
import { useRouter } from 'next/navigation';
import { AppShell } from '@/components/layouts/AppShell/AppShell';
import { ProtectedRoute } from '@/components/common/ProtectedRoute';
import { motion } from 'framer-motion';
import { useForm, Controller } from 'react-hook-form';
import { zodResolver } from '@hookform/resolvers/zod';
import * as z from 'zod';
import { format } from 'date-fns';

const diaperSchema = z.object({
  type: z.enum(['wet', 'dirty', 'both', 'clean']),
  timestamp: z.string(),
  rash: z.boolean(),
  notes: z.string().optional(),
});

type DiaperFormData = z.infer<typeof diaperSchema>;

export default function DiaperTrackPage() {
  const router = useRouter();
  const [error, setError] = useState<string | null>(null);
  const [success, setSuccess] = useState(false);

  const {
    register,
    handleSubmit,
    setValue,
    watch,
    control,
    formState: { errors },
  } = useForm<DiaperFormData>({
    resolver: zodResolver(diaperSchema),
    defaultValues: {
      type: 'wet',
      rash: false,
      timestamp: format(new Date(), "yyyy-MM-dd'T'HH:mm"),
    },
  });

  const diaperType = watch('type');
  const rash = watch('rash');

  const setTimeNow = () => {
    const now = format(new Date(), "yyyy-MM-dd'T'HH:mm");
    setValue('timestamp', now);
  };

  const onSubmit = async (data: DiaperFormData) => {
    setError(null);

    try {
      // TODO: Call API to save diaper data
      console.log('Diaper data:', data);
      setSuccess(true);
      setTimeout(() => router.push('/'), 2000);
    } catch (err: any) {
      setError(err.message || 'Failed to log diaper change');
    }
  };

  return (
    <ProtectedRoute>
      <AppShell>
        <Box>
          <Box sx={{ display: 'flex', alignItems: 'center', mb: 3 }}>
            <IconButton onClick={() => router.back()} sx={{ mr: 2 }}>
              <ArrowBack />
            </IconButton>
            <Typography variant="h4" fontWeight="600">
              Track Diaper Change
            </Typography>
          </Box>

          {success && (
            <Alert severity="success" sx={{ mb: 3 }}>
              Diaper change logged successfully!
            </Alert>
          )}

          {error && (
            <Alert severity="error" sx={{ mb: 3 }}>
              {error}
            </Alert>
          )}

          <motion.div
            initial={{ opacity: 0, y: 20 }}
            animate={{ opacity: 1, y: 0 }}
            transition={{ duration: 0.3 }}
          >
            <Paper sx={{ p: 3, mb: 3 }}>
              <Box component="form" onSubmit={handleSubmit(onSubmit)}>
                {/* Icon Header */}
                <Box sx={{ display: 'flex', justifyContent: 'center', mb: 3 }}>
                  <BabyChangingStation sx={{ fontSize: 64, color: 'primary.main' }} />
                </Box>

                {/* Time */}
                <Box sx={{ mb: 3 }}>
                  <FormLabel sx={{ mb: 1, display: 'block' }}>Time</FormLabel>
                  <Box sx={{ display: 'flex', gap: 2, alignItems: 'flex-start' }}>
                    <TextField
                      fullWidth
                      type="datetime-local"
                      {...register('timestamp')}
                      error={!!errors.timestamp}
                      helperText={errors.timestamp?.message}
                      InputLabelProps={{ shrink: true }}
                    />
                    <Button variant="outlined" onClick={setTimeNow} sx={{ minWidth: 100 }}>
                      Now
                    </Button>
                  </Box>
                </Box>

                {/* Diaper Type */}
                <FormControl component="fieldset" sx={{ mb: 3, width: '100%' }}>
                  <FormLabel component="legend" sx={{ mb: 2 }}>
                    Diaper Type
                  </FormLabel>
                  <Controller
                    name="type"
                    control={control}
                    render={({ field }) => (
                      <ToggleButtonGroup
                        {...field}
                        exclusive
                        fullWidth
                        onChange={(_, value) => {
                          if (value !== null) {
                            field.onChange(value);
                          }
                        }}
                      >
                        <ToggleButton value="wet" sx={{ py: 2 }}>
                          <Box sx={{ textAlign: 'center' }}>
                            <Typography variant="h5">💧</Typography>
                            <Typography variant="body2">Wet</Typography>
                          </Box>
                        </ToggleButton>
                        <ToggleButton value="dirty" sx={{ py: 2 }}>
                          <Box sx={{ textAlign: 'center' }}>
                            <Typography variant="h5">💩</Typography>
                            <Typography variant="body2">Dirty</Typography>
                          </Box>
                        </ToggleButton>
                        <ToggleButton value="both" sx={{ py: 2 }}>
                          <Box sx={{ textAlign: 'center' }}>
                            <Typography variant="h5">💧💩</Typography>
                            <Typography variant="body2">Both</Typography>
                          </Box>
                        </ToggleButton>
                        <ToggleButton value="clean" sx={{ py: 2 }}>
                          <Box sx={{ textAlign: 'center' }}>
                            <Typography variant="h5">✨</Typography>
                            <Typography variant="body2">Clean</Typography>
                          </Box>
                        </ToggleButton>
                      </ToggleButtonGroup>
                    )}
                  />
                </FormControl>

                {/* Rash Indicator */}
                <FormControl component="fieldset" sx={{ mb: 3, width: '100%' }}>
                  <FormLabel component="legend" sx={{ mb: 2 }}>
                    Diaper Rash?
                  </FormLabel>
                  <RadioGroup row>
                    <FormControlLabel
                      value="no"
                      control={
                        <Radio
                          checked={!rash}
                          onChange={() => setValue('rash', false)}
                        />
                      }
                      label="No"
                    />
                    <FormControlLabel
                      value="yes"
                      control={
                        <Radio
                          checked={rash}
                          onChange={() => setValue('rash', true)}
                        />
                      }
                      label="Yes"
                    />
                  </RadioGroup>
                </FormControl>

                {/* Rash Warning */}
                {rash && (
                  <Alert severity="warning" sx={{ mb: 3 }}>
                    Consider applying diaper rash cream and consulting your pediatrician if it persists.
                  </Alert>
                )}

                {/* Notes */}
                <TextField
                  fullWidth
                  label="Notes (optional)"
                  multiline
                  rows={3}
                  {...register('notes')}
                  sx={{ mb: 3 }}
                  placeholder="Color, consistency, or any concerns..."
                />

                {/* Voice Input Button */}
                <Box sx={{ display: 'flex', justifyContent: 'center', mb: 3 }}>
                  <Chip
                    icon={<Mic />}
                    label="Use Voice Input"
                    onClick={() => {/* TODO: Implement voice input */}}
                    sx={{ cursor: 'pointer' }}
                  />
                </Box>

                {/* Submit Button */}
                <Button
                  fullWidth
                  type="submit"
                  variant="contained"
                  size="large"
                  startIcon={<Save />}
                >
                  Save Diaper Change
                </Button>
              </Box>
            </Paper>
          </motion.div>
        </Box>
      </AppShell>
    </ProtectedRoute>
  );
}