'use client'

import { useState, useEffect } from 'react'
import { createPortal } from 'react-dom'
import { NoteChartFromCode } from './note-chart'
import { suggestCharts, chartSuggestionToMarkdown, type ChartSuggestion, type SuggestChartsResponse } from '@/lib/ai/services/chart-suggestion.service'
import { BarChart3, X, Search, AlertCircle } from 'lucide-react'
import { cn } from '@/lib/utils'

interface ChartSuggestionsDialogProps {
  isOpen: boolean
  content: string
  selection: string | null
  noteId?: string
  onClose: () => void
  onSelectChart: (markdown: string) => void
}

export function ChartSuggestionsDialog({
  isOpen,
  content,
  selection,
  noteId,
  onClose,
  onSelectChart,
}: ChartSuggestionsDialogProps) {
  const [response, setResponse] = useState<SuggestChartsResponse | null>(null)
  const [loading, setLoading] = useState(false)
  const [selectedIndex, setSelectedIndex] = useState<number | null>(null)

  // Reset state when dialog opens
  useEffect(() => {
    let aborted = false

    if (isOpen) {
      setResponse(null)
      setLoading(true)
      setSelectedIndex(null)

      // Call the suggestion API
      suggestCharts({ content, selection, noteId })
        .then(data => {
          if (aborted) return
          setResponse(data)
          setLoading(false)
        })
        .catch(err => {
          if (aborted) return
          console.error('[ChartSuggestionsDialog] Error:', err)
          setResponse({
            suggestions: [],
            analyzedText: '',
            detectedData: '',
            hasData: false,
            error: err.message || 'Failed to load suggestions',
          })
          setLoading(false)
        })
    }

    return () => {
      aborted = true
    }
  }, [isOpen, content, selection, noteId])

  // Handle keyboard shortcuts
  useEffect(() => {
    if (!isOpen) return

    const handleKeyDown = (e: KeyboardEvent) => {
      if (e.key === 'Escape') {
        onClose()
      }
      if (e.key === 'ArrowRight' && response?.suggestions) {
        setSelectedIndex(i => i === null ? 0 : (i + 1) % response.suggestions.length)
      }
      if (e.key === 'ArrowLeft' && response?.suggestions) {
        setSelectedIndex(i => i === null ? 0 : (i === 0 ? response.suggestions.length - 1 : i - 1))
      }
      if (e.key === 'Enter' && selectedIndex !== null && response?.suggestions?.[selectedIndex]) {
        onSelectChart(chartSuggestionToMarkdown(response.suggestions[selectedIndex]))
        onClose()
      }
    }

    document.addEventListener('keydown', handleKeyDown)
    return () => document.removeEventListener('keydown', handleKeyDown)
  }, [isOpen, onClose, selectedIndex, response, onSelectChart])

  if (!isOpen) return null

  const textToAnalyze = selection || content
  const isAnalyzingSelection = !!selection
  const wordCount = textToAnalyze.split(/\s+/).length

  const handleSelectChart = (suggestion: ChartSuggestion) => {
    onSelectChart(chartSuggestionToMarkdown(suggestion))
    onClose()
  }

  return createPortal(
    <div className="fixed inset-0 z-50 flex items-center justify-center p-4 bg-black/50" onClick={onClose}>
      <div
        className="bg-background rounded-xl shadow-lg w-full max-w-4xl max-h-[80vh] overflow-hidden flex flex-col"
        onClick={(e) => e.stopPropagation()}
      >
        {/* Header */}
        <div className="flex items-center justify-between px-6 py-4 border-b">
          <div className="flex items-center gap-3">
            <BarChart3 className="w-5 h-5 text-primary" />
            <div>
              <h2 className="text-lg font-semibold">Chart Suggestions</h2>
              <p className="text-sm text-muted-foreground">
                {loading ? (
                  <span className="flex items-center gap-2">
                    <Search className="w-3 h-3 animate-spin" />
                    Analyzing {isAnalyzingSelection ? 'selection' : 'note'} ({wordCount} words)...
                  </span>
                ) : response?.hasData ? (
                  `Found ${response?.detectedData || 'data'}`
                ) : (
                  'No data detected'
                )}
              </p>
            </div>
          </div>
          <button
            onClick={onClose}
            className="p-2 hover:bg-muted rounded-lg transition-colors"
            aria-label="Close"
          >
            <X className="w-5 h-5" />
          </button>
        </div>

        {/* Content */}
        <div className="flex-1 overflow-auto p-6">
          {loading ? (
            <div className="flex items-center justify-center py-12">
              <div className="text-center">
                <Search className="w-12 h-12 mx-auto mb-4 text-muted-foreground animate-pulse" />
                <p className="text-muted-foreground">Analyzing your content for chart data...</p>
              </div>
            </div>
          ) : response?.error ? (
            <div className="flex items-center justify-center py-12">
              <div className="text-center max-w-md">
                <AlertCircle className="w-12 h-12 mx-auto mb-4 text-destructive" />
                <h3 className="text-lg font-semibold mb-2">Error</h3>
                <p className="text-muted-foreground">{response.error}</p>
              </div>
            </div>
          ) : !response?.hasData ? (
            <div className="flex items-center justify-center py-12">
              <div className="text-center max-w-md">
                <AlertCircle className="w-12 h-12 mx-auto mb-4 text-muted-foreground" />
                <h3 className="text-lg font-semibold mb-2">No Data Detected</h3>
                <p className="text-muted-foreground mb-4">
                  Try adding numerical data to your note. Charts work best with:
                </p>
                <ul className="text-sm text-muted-foreground text-left inline-block">
                  <li>• Sales figures, metrics, or measurements</li>
                  <li>• Lists with values (e.g., "Jan: 5000, Feb: 7500")</li>
                  <li>• Percentages or proportions</li>
                  <li>• Time-series data</li>
                </ul>
              </div>
            </div>
          ) : (
            <div className="space-y-4">
              <p className="text-sm text-muted-foreground">
                Select a chart type to insert:
              </p>

              {/* Chart suggestions grid */}
              <div className="grid grid-cols-1 md:grid-cols-3 gap-4">
                {response.suggestions.map((suggestion, index) => {
                  const isSelected = selectedIndex === index
                  const markdown = chartSuggestionToMarkdown(suggestion)

                  return (
                    <button
                      key={index}
                      onClick={() => handleSelectChart(suggestion)}
                      onMouseEnter={() => setSelectedIndex(index)}
                      className={cn(
                        'text-left p-4 rounded-xl border-2 transition-all hover:shadow-md',
                        isSelected
                          ? 'border-primary bg-primary/5'
                          : 'border-border hover:border-primary/50'
                      )}
                    >
                      {/* Mini thumbnail */}
                      <div className="aspect-video bg-card rounded-lg mb-3 overflow-hidden flex items-center justify-center p-2">
                        <div className="w-full scale-75 origin-center">
                          <NoteChartFromCode code={markdown} />
                        </div>
                      </div>

                      {/* Chart type badge */}
                      <div className="mb-2">
                        <span className="text-xs font-medium px-2 py-1 bg-primary/10 text-primary rounded-full">
                          {suggestion.type}
                        </span>
                      </div>

                      {/* Title */}
                      <h3 className="font-semibold text-sm mb-1">{suggestion.title}</h3>

                      {/* Description */}
                      <p className="text-xs text-muted-foreground mb-2">{suggestion.description}</p>

                      {/* Rationale */}
                      {suggestion.rationale && (
                        <p className="text-xs text-muted-foreground/70 italic">
                          "{suggestion.rationale}"
                        </p>
                      )}

                      {/* Data preview */}
                      <div className="mt-2 pt-2 border-t border-border/50">
                        <p className="text-xs text-muted-foreground">
                          {suggestion.data.length} data points
                        </p>
                      </div>
                    </button>
                  )
                })}
              </div>

              {/* Keyboard hint */}
              <div className="flex items-center justify-center gap-4 pt-4 text-xs text-muted-foreground">
                <span>← → Navigate</span>
                <span>↵ Select</span>
                <span>Esc Cancel</span>
              </div>
            </div>
          )}
        </div>
      </div>
    </div>,
    document.body
  )
}