import { useState, useEffect } from 'react'
import { Download, X } from 'lucide-react'
import { flowTransferApi } from '@/api/flowTransfer'
import { toast } from '@/lib/toast'
import { Button } from '@/components/ui/Button'

interface ExportFlowModalProps {
  treeId: string
  treeName: string
  onClose: () => void
}

function slugify(name: string): string {
  return name.toLowerCase().trim().replace(/[^\w\s-]/g, '').replace(/[-\s]+/g, '-')
}

export function ExportFlowModal({ treeId, treeName, onClose }: ExportFlowModalProps) {
  const [isExporting, setIsExporting] = useState(false)

  useEffect(() => {
    const handleKeyDown = (e: KeyboardEvent) => {
      if (e.key === 'Escape') onClose()
    }
    document.addEventListener('keydown', handleKeyDown)
    return () => document.removeEventListener('keydown', handleKeyDown)
  }, [onClose])

  const handleExport = async () => {
    setIsExporting(true)
    try {
      const blob = await flowTransferApi.exportFlow(treeId)
      const url = URL.createObjectURL(blob)
      const a = document.createElement('a')
      a.href = url
      a.download = `${slugify(treeName)}.rfflow`
      document.body.appendChild(a)
      a.click()
      document.body.removeChild(a)
      URL.revokeObjectURL(url)
      toast.success('Flow exported successfully')
      onClose()
    } catch (err) {
      console.error('Export failed:', err)
      toast.error('Failed to export flow')
    } finally {
      setIsExporting(false)
    }
  }

  return (
    <div
      className="fixed inset-0 z-50 flex items-center justify-center bg-black/60 p-4"
      onClick={onClose}
    >
      <div
        className="w-full max-w-sm rounded-xl border border-border bg-card shadow-xl"
        onClick={(e) => e.stopPropagation()}
      >
        {/* Header */}
        <div className="flex items-center justify-between border-b border-border px-5 py-4">
          <div className="flex items-center gap-2">
            <Download className="h-4 w-4 text-muted-foreground" />
            <h2 className="text-sm font-semibold text-foreground">Export Flow</h2>
          </div>
          <button
            onClick={onClose}
            aria-label="Close"
            className="rounded-md p-1 text-muted-foreground hover:bg-accent hover:text-foreground"
          >
            <X className="h-4 w-4" />
          </button>
        </div>

        {/* Body */}
        <div className="px-5 py-4">
          <p className="text-sm text-muted-foreground">
            Export <span className="font-medium text-foreground">{treeName}</span> as a <code className="text-xs font-sans text-xs">.rfflow</code> file (JSON format).
          </p>
        </div>

        {/* Footer */}
        <div className="flex justify-end gap-2 border-t border-border px-5 py-3">
          <Button variant="secondary" onClick={onClose}>
            Cancel
          </Button>
          <Button
            onClick={handleExport}
            loading={isExporting}
          >
            <Download className="h-4 w-4" />
            Download .rfflow
          </Button>
        </div>
      </div>
    </div>
  )
}