import { Modal } from '@/components/common/Modal'
import { ArrowRight, GitBranch, AlertTriangle, HelpCircle, Zap, CheckCircle } from 'lucide-react'
import { cn } from '@/lib/utils'
import type { NodeType } from '@/types/tree'

export interface DescendantNode {
  id: string
  label: string
  type: NodeType
  parentOptionLabel: string
}

interface ContinuationModalProps {
  isOpen: boolean
  onClose: () => void
  descendantNodes: DescendantNode[]
  onSelectNode: (nodeId: string) => void
  onBuildCustomBranch: () => void
}

const nodeTypeIcons: Record<NodeType, React.ReactNode> = {
  decision: <HelpCircle className="h-4 w-4 text-blue-500" />,
  action: <Zap className="h-4 w-4 text-amber-500" />,
  solution: <CheckCircle className="h-4 w-4 text-green-500" />,
  answer: <HelpCircle className="h-4 w-4 opacity-40" />
}

const nodeTypeLabels: Record<NodeType, string> = {
  decision: 'Decision',
  action: 'Action',
  solution: 'Solution',
  answer: 'Answer'
}

export function ContinuationModal({
  isOpen,
  onClose,
  descendantNodes,
  onSelectNode,
  onBuildCustomBranch
}: ContinuationModalProps) {
  const hasDescendants = descendantNodes.length > 0

  return (
    <Modal isOpen={isOpen} onClose={onClose} title="Where does this lead?" size="lg">
      <div className="space-y-6">
        {/* Descendant Selection */}
        {hasDescendants && (
          <div>
            <p className="mb-4 text-sm text-muted-foreground">
              Select the next step in your troubleshooting path:
            </p>

            <div className="space-y-2">
              {descendantNodes.map(node => (
                <button
                  key={node.id}
                  onClick={() => onSelectNode(node.id)}
                  title={`From: ${node.parentOptionLabel}`}
                  className={cn(
                    'flex w-full items-center gap-3 rounded-lg border border-border p-3 text-left transition-colors',
                    'hover:border-border hover:bg-accent'
                  )}
                >
                  <div className="flex h-8 w-8 shrink-0 items-center justify-center rounded-full bg-accent">
                    {nodeTypeIcons[node.type]}
                  </div>
                  <div className="min-w-0 flex-1">
                    <p className="truncate font-medium text-foreground">{node.label}</p>
                    <p className="text-xs text-muted-foreground">
                      {nodeTypeLabels[node.type]}
                    </p>
                  </div>
                  <ArrowRight className="h-4 w-4 shrink-0 text-muted-foreground" />
                </button>
              ))}
            </div>
          </div>
        )}

        {/* Divider */}
        {hasDescendants && (
          <div className="flex items-center gap-4">
            <div className="h-px flex-1 bg-border" />
            <span className="text-xs font-medium uppercase tracking-wide text-muted-foreground">
              Or
            </span>
            <div className="h-px flex-1 bg-border" />
          </div>
        )}

        {/* Build Custom Branch */}
        <div>
          <button
            onClick={onBuildCustomBranch}
            className={cn(
              'flex w-full items-center gap-3 rounded-lg border-2 border-dashed border-amber-500/50 bg-amber-500/5 p-4 text-left transition-colors',
              'hover:border-amber-500 hover:bg-amber-500/10'
            )}
          >
            <div className="flex h-10 w-10 shrink-0 items-center justify-center rounded-full bg-amber-500/10">
              <GitBranch className="h-5 w-5 text-amber-500" />
            </div>
            <div className="flex-1">
              <p className="font-medium text-foreground">Build Custom Branch</p>
              <p className="text-sm text-muted-foreground">
                Create your own troubleshooting path with custom steps
              </p>
            </div>
          </button>

          {/* Warning */}
          <div className="mt-3 flex items-start gap-2 rounded-md bg-yellow-400/10 p-3">
            <AlertTriangle className="mt-0.5 h-4 w-4 shrink-0 text-yellow-400" />
            <p className="text-sm text-yellow-400">
              You'll need to complete this branch manually or mark the issue as resolved.
              Custom branches can be saved as a personal tree when your session ends.
            </p>
          </div>
        </div>
      </div>
    </Modal>
  )
}
