'use client'

import { Node } from '@tiptap/core'
import { ReactNodeViewRenderer, NodeViewWrapper, NodeViewContent } from '@tiptap/react'
import { NoteChartFromCode } from './note-chart'
import { useState } from 'react'
import { Code, BarChart3, AlertCircle } from 'lucide-react'
import { cn } from '@/lib/utils'

/**
 * ChartExtension - TipTap Node extension for rendering chart blocks
 *
 * Detects <pre><code class="language-chart"> blocks and renders them
 * as visual charts using the NoteChartFromCode component.
 */
export const ChartExtension = Node.create({
  name: 'chartBlock',

  group: 'block',

  code: true,

  defining: true,

  addOptions() {
    return {
      HTMLAttributes: {},
    }
  },

  addAttributes() {
    return {
      code: {
        default: '',
        parseHTML: element => {
          if (element instanceof HTMLElement) {
            const codeEl = element.querySelector('code')
            return codeEl?.textContent || ''
          }
          return ''
        },
        renderHTML: () => ({})
      },
      language: {
        default: 'chart',
        parseHTML: element => {
          if (element instanceof HTMLElement) {
            const codeEl = element.querySelector('code')
            // Check for class="language-chart" or data-language="chart"
            if (codeEl?.classList.contains('language-chart')) return 'chart'
            return element.getAttribute('data-language') || 'chart'
          }
          return 'chart'
        },
        renderHTML: attributes => ({
          'data-language': attributes.language,
        })
      }
    }
  },

  parseHTML() {
    return [
      {
        tag: 'pre',
        getAttrs: node => {
          if (typeof node === 'string') return false
          const element = node as HTMLElement
          const codeEl = element.querySelector('code')

          // Detect chart blocks by class="language-chart"
          if (codeEl && codeEl.classList.contains('language-chart')) {
            // Store the code content as an attribute
            const codeContent = codeEl.textContent || ''
            return {
              code: codeContent,
              language: 'chart'
            }
          }

          return false
        }
      }
    ]
  },

  renderHTML({ HTMLAttributes, node }) {
    // Get the code content from node attrs
    const code = node.attrs.code || ''
    return ['pre', { ...HTMLAttributes, class: 'language-chart' }, ['code', { class: 'language-chart' }, code]]
  },

  addNodeView() {
    return ReactNodeViewRenderer(ChartBlockView, {
      contentEditable: false,
    })
  }
})

/**
 * ChartBlockView - React component for rendering chart blocks in TipTap
 *
 * Features:
 * - Visual chart rendering with NoteChartFromCode
 * - Toggle between visual and code view
 * - Edit mode for modifying chart data
 * - Error handling for invalid chart data
 */
function ChartBlockView(props: any) {
  const [isEditing, setIsEditing] = useState(false)
  const [parseError, setParseError] = useState(false)

  const code = props.node?.attrs?.code || ''

  // Check if chart code is valid when not editing
  const isValidChart = !isEditing && code.trim().length > 0

  if (isEditing) {
    return (
      <NodeViewWrapper className="notion-chart-code-block my-4">
        <div className="flex items-center gap-2 px-3 py-2 bg-muted/50 rounded-t-lg border-b border-border">
          <Code className="w-4 h-4 text-muted-foreground" />
          <span className="text-sm text-muted-foreground">Chart Code</span>
          <button
            onClick={() => setIsEditing(false)}
            className="ml-auto text-xs px-2 py-1 bg-primary text-primary-foreground rounded hover:opacity-90 transition-opacity"
          >
            Done
          </button>
        </div>
        <NodeViewContent as="pre" className="p-4 bg-muted/30 rounded-b-lg overflow-x-auto" />
      </NodeViewWrapper>
    )
  }

  return (
    <NodeViewWrapper className="notion-chart-block my-4 group relative">
      <div className="relative">
        {/* Chart visual rendering */}
        {isValidChart ? (
          <NoteChartFromCode code={code} />
        ) : (
          <div className="my-6 rounded-xl border border-dashed border-border bg-muted/30 p-6">
            <div className="flex items-center gap-3 text-muted-foreground">
              <AlertCircle className="w-5 h-5" />
              <div>
                <p className="font-medium">Invalid Chart</p>
                <p className="text-sm">This chart block contains invalid or empty data.</p>
              </div>
            </div>
          </div>
        )}

        {/* Edit button - visible on hover */}
        <button
          onClick={() => setIsEditing(true)}
          className={cn(
            'absolute top-2 right-2 p-2 rounded-lg bg-background/80 backdrop-blur border border-border shadow-sm opacity-0 group-hover:opacity-100 transition-opacity',
            'hover:bg-background hover:shadow-md'
          )}
          title="Edit chart source"
        >
          <Code className="w-4 h-4 text-muted-foreground" />
        </button>

        {/* Chart type indicator */}
        {isValidChart && (
          <div className="absolute top-2 left-2 px-2 py-1 rounded bg-background/80 backdrop-blur border border-border shadow-sm opacity-0 group-hover:opacity-100 transition-opacity">
            <div className="flex items-center gap-1 text-xs text-muted-foreground">
              <BarChart3 className="w-3 h-3" />
              <span>Chart</span>
            </div>
          </div>
        )}
      </div>
    </NodeViewWrapper>
  )
}