'use client'

import { Dialog, DialogContent, DialogTitle, DialogDescription } from '@/components/ui/dialog'
import { Button } from '@/components/ui/button'
import { Columns2, GitMerge, X, ExternalLink } from 'lucide-react'
import { cn } from '@/lib/utils'
import { Note } from '@/lib/types'
import { useLanguage } from '@/lib/i18n/LanguageProvider'

interface ComparisonModalProps {
  isOpen: boolean
  onClose: () => void
  notes: Array<Partial<Note>>
  similarity?: number
  onMergeNotes?: (noteIds: string[]) => void
}

function stripHtml(html: string): string {
  return html.replace(/<[^>]+>/g, ' ').replace(/\s+/g, ' ').trim()
}

function openNoteInNewTab(noteId: string) {
  window.open(`/home?openNote=${encodeURIComponent(noteId)}`, '_blank', 'noopener,noreferrer')
}

export function ComparisonModal({
  isOpen,
  onClose,
  notes,
  similarity,
  onMergeNotes,
}: ComparisonModalProps) {
  const { t } = useLanguage()

  const getNoteColor = (index: number) => {
    const colors = [
      'border-indigo-200/80 dark:border-indigo-800/80',
      'border-purple-200/80 dark:border-purple-800/80',
      'border-emerald-200/80 dark:border-emerald-800/80',
    ]
    return colors[index % colors.length]
  }

  const getTitleColor = (index: number) => {
    const colors = [
      'text-indigo-700 dark:text-indigo-300',
      'text-purple-700 dark:text-purple-300',
      'text-emerald-700 dark:text-emerald-300',
    ]
    return colors[index % colors.length]
  }

  const maxModalWidth = notes.length === 2 ? 'max-w-6xl' : 'max-w-7xl'
  const similarityPercentage = similarity ? Math.round(similarity * 100) : 0

  return (
    <Dialog open={isOpen} onOpenChange={onClose}>
      <DialogContent
        showCloseButton={false}
        className={cn('max-h-[90vh] overflow-hidden flex flex-col p-0', maxModalWidth)}
      >
        <div className="flex items-center justify-between p-6 border-b border-border/60">
          <div className="flex items-center gap-3">
            <div className="p-2 rounded-lg bg-indigo-500/10">
              <Columns2 className="h-5 w-5 text-indigo-600 dark:text-indigo-400" />
            </div>
            <div>
              <DialogTitle className="text-xl font-semibold">
                {t('memoryEcho.comparison.title')}
              </DialogTitle>
              <DialogDescription className="text-sm text-muted-foreground">
                {similarityPercentage > 0
                  ? t('memoryEcho.comparison.similarityInfo', { similarity: similarityPercentage })
                  : t('memoryEcho.comparison.subtitle')}
              </DialogDescription>
            </div>
          </div>
          <button
            type="button"
            onClick={onClose}
            className="p-1 rounded-md text-muted-foreground hover:text-foreground hover:bg-muted transition-colors"
            aria-label={t('memoryEcho.editorSection.close')}
          >
            <X className="h-5 w-5" />
          </button>
        </div>

        <div className="px-6 py-3 border-b border-border/60 bg-muted/20">
          <p className="text-sm text-muted-foreground">
            {t('memoryEcho.comparison.stayOnCurrentNote')}
          </p>
        </div>

        {similarityPercentage >= 80 && (
          <div className="px-6 py-3 border-b border-border/60">
            <p className="text-sm text-muted-foreground">
              {t('memoryEcho.comparison.highSimilarityInsight')}
            </p>
          </div>
        )}

        <div
          className={cn(
            'flex-1 overflow-y-auto p-6',
            notes.length === 2 ? 'grid grid-cols-1 md:grid-cols-2 gap-6' : 'grid grid-cols-1 md:grid-cols-3 gap-4'
          )}
        >
          {notes.map((note, index) => {
            const title = note.title || t('memoryEcho.comparison.untitled')
            const plainContent = stripHtml(note.content || '')

            return (
              <div
                key={note.id || index}
                className={cn(
                  'border rounded-xl p-4 bg-card flex flex-col',
                  getNoteColor(index)
                )}
              >
                <h3 className={cn('font-semibold text-lg mb-3', getTitleColor(index))}>
                  {title}
                </h3>
                <div className="text-sm text-muted-foreground line-clamp-[14] whitespace-pre-wrap flex-1">
                  {plainContent}
                </div>
                {note.id && (
                  <div className="mt-4 pt-3 border-t border-border/60">
                    <button
                      type="button"
                      onClick={() => openNoteInNewTab(note.id!)}
                      className="text-xs text-muted-foreground hover:text-foreground inline-flex items-center gap-1 transition-colors"
                    >
                      <ExternalLink className="h-3 w-3" />
                      {t('memoryEcho.editorSection.openInEditor')}
                    </button>
                  </div>
                )}
              </div>
            )
          })}
        </div>

        <div className="px-6 py-4 border-t border-border/60 bg-muted/30 flex items-center justify-end gap-2">
          <Button size="sm" variant="outline" onClick={onClose}>
            {t('memoryEcho.editorSection.backToNote')}
          </Button>
          {onMergeNotes && notes.length >= 2 && (
            <Button
              size="sm"
              className="bg-indigo-600 hover:bg-indigo-700 text-white"
              onClick={() => {
                const noteIds = notes.map(n => n.id).filter(Boolean) as string[]
                onMergeNotes(noteIds)
                onClose()
              }}
            >
              <GitMerge className="h-4 w-4 mr-2" />
              {t('memoryEcho.editorSection.mergeAll')}
            </Button>
          )}
        </div>
      </DialogContent>
    </Dialog>
  )
}