'use client'

import { useState, useCallback } from 'react'
import { useTranslations } from 'next-intl'
import Box from '@mui/material/Box'
import Card from '@mui/material/Card'
import CardContent from '@mui/material/CardContent'
import Typography from '@mui/material/Typography'
import Button from '@mui/material/Button'
import CircularProgress from '@mui/material/CircularProgress'
import Collapse from '@mui/material/Collapse'
import { useTheme } from '@mui/material/styles'
import { alpha } from '@mui/material/styles'
import classnames from 'classnames'

// Util Imports
import { commonLayoutClasses } from '@layouts/utils/layoutClasses'

import UploadBox from './components/UploadBox'
import ResultCard from './components/ResultCard'
import type { UploadedFile } from './components/UploadBox'
import type { PestResult } from './components/ResultCard'

export default function PlantPestDetection() {
  const t = useTranslations('pestDetection')
  const theme = useTheme()
  const primary = theme.palette.primary
  const [file, setFile] = useState<UploadedFile | null>(null)
  const [result, setResult] = useState<PestResult | null>(null)
  const [loading, setLoading] = useState(false)
  const [error, setError] = useState<string | null>(null)

  const handleFileSelect = useCallback((newFile: UploadedFile | null) => {
    setFile(newFile)
    setResult(null)
    setError(null)
  }, [])

  const handleAnalyze = useCallback(() => {
    if (!file) return

    setLoading(true)
    setError(null)
    setResult(null)

    const delay = 1500 + Math.random() * 1000
    setTimeout(() => {
      setResult({
        pest: t('mockResult.pest'),
        confidence: 92,
        description: t('mockResult.description'),
        treatment: t('mockResult.treatment'),
      })
      setLoading(false)
    }, delay)
  }, [file, t])

  const handleReset = useCallback(() => {
    if (file) {
      URL.revokeObjectURL(file.preview)
    }
    setFile(null)
    setResult(null)
    setError(null)
    setLoading(false)
  }, [file])

  return (
    <Box
      className={classnames(commonLayoutClasses.contentHeightFixed, 'flex flex-col is-full overflow-hidden rounded')}
      sx={{ minHeight: '100%' }}
    >
      <Box className="is-full py-6 sm:py-8 flex flex-col">
        {/* Header */}
        <Box className="mb-8">
          <Typography
            variant="h4"
            className="font-bold tracking-tight"
            sx={{
              background: `linear-gradient(135deg, ${primary.main} 0%, ${primary.dark} 50%, ${primary.dark} 100%)`,
              backgroundClip: 'text',
              WebkitBackgroundClip: 'text',
              color: 'transparent',
              fontSize: { xs: '1.5rem', sm: '1.75rem' },
            }}
          >
            {t('title')}
          </Typography>
          <Typography variant="body2" color="text.secondary" className="mt-1">
            {t('subtitle')}
          </Typography>
        </Box>

        {/* Upload card */}
        <Card
          elevation={0}
          className="mb-6 overflow-hidden transition-all duration-300 hover:shadow-lg"
          sx={{
            borderRadius: '24px',
            background: `linear-gradient(145deg, ${theme.palette.background.paper} 0%, ${alpha(primary.main, 0.04)} 100%)`,
            boxShadow: `0 4px 24px ${alpha(primary.main, 0.08)}, ${theme.shadows[1]}`,
            border: `1px solid ${alpha(primary.main, 0.12)}`,
          }}
        >
          <CardContent className="p-5 sm:p-6">
            <UploadBox
              file={file}
              onFileSelect={handleFileSelect}
              onError={setError}
              error={error ?? undefined}
            />

            {/* Action buttons */}
            <Box className="mt-6 flex flex-col gap-3 sm:flex-row sm:justify-center">
              <Button
                variant="contained"
                disabled={!file || loading}
                onClick={handleAnalyze}
                startIcon={
                  loading ? (
                    <CircularProgress size={20} color="inherit" />
                  ) : (
                    <i className="tabler-scan text-xl" />
                  )
                }
                className="rounded-xl py-3 px-8 font-semibold shadow-md transition-all duration-300 hover:shadow-lg hover:scale-[1.02] active:scale-[0.98]"
                sx={{
                  background: `linear-gradient(135deg, ${primary.main} 0%, ${primary.dark} 50%, ${primary.dark} 100%)`,
                  boxShadow: `0 4px 20px ${alpha(primary.main, 0.35)}`,
                  '&:hover': {
                    background: `linear-gradient(135deg, ${primary.light} 0%, ${primary.main} 50%, ${primary.dark} 100%)`,
                    boxShadow: `0 6px 24px ${alpha(primary.main, 0.45)}`,
                  },
                  '&:disabled': {
                    background: 'action.disabledBackground',
                    color: 'action.disabled',
                  },
                }}
              >
                {loading ? t('analyzing') : t('analyze')}
              </Button>

              {file && (
                <Button
                  variant="outlined"
                  onClick={handleReset}
                  disabled={loading}
                  startIcon={<i className="tabler-rotate-2 text-lg" />}
                  className="rounded-xl py-3 px-8 font-semibold"
                  sx={{
                    borderColor: 'divider',
                    '&:hover': {
                      borderColor: 'primary.main',
                      backgroundColor: 'action.hover',
                    },
                  }}
                >
                  {t('reset')}
                </Button>
              )}
            </Box>
          </CardContent>
        </Card>

        {/* Loading state */}
        <Collapse in={loading}>
          <Card
            elevation={0}
            className="mb-6"
            sx={{
              borderRadius: '24px',
              background: `linear-gradient(160deg, ${theme.palette.background.paper} 0%, ${alpha(primary.main, 0.06)} 100%)`,
              boxShadow: `0 8px 32px ${alpha(primary.main, 0.1)}`,
              border: `1px solid ${alpha(primary.main, 0.12)}`,
            }}
          >
            <CardContent className="p-12 flex flex-col items-center gap-4">
              <CircularProgress size={48} sx={{ color: 'primary.main' }} />
              <Typography variant="body2" color="text.secondary">
                {t('analyzing')}
              </Typography>
            </CardContent>
          </Card>
        </Collapse>

        {/* Result card */}
        <Collapse in={!!result && !loading}>
          {result && !loading && (
            <Box className="mb-6">
              <Typography variant="subtitle2" fontWeight={600} color="text.secondary" className="mbe-3">
                {t('resultTitle')}
              </Typography>
              <ResultCard result={result} />
            </Box>
          )}
        </Collapse>
      </Box>
    </Box>
  )
}
