import clsx from 'clsx'
import type { ParsedDoc, DocTable, DocCodeBlock } from '@/lib/types'

interface DocContentProps {
  doc: ParsedDoc | null
  onReferenceClick: (ref: string) => void
}

export const DocContent = ({ doc, onReferenceClick }: DocContentProps) => {
  if (!doc) {
    return (
      <div className="flex items-center justify-center h-full text-gray-500">
        <p>Select a document from the sidebar</p>
      </div>
    )
  }

  return (
    <div className="h-full overflow-auto p-6">
      <div className="max-w-4xl mx-auto">
        <h1 className="text-2xl font-bold text-white mb-4">{doc.title}</h1>

        {doc.metadata.namespace && (
          <div className="mb-4">
            <span className="text-gray-400">Namespace: </span>
            <code className="bg-gray-800 px-2 py-1 rounded text-blue-400">{doc.metadata.namespace}</code>
          </div>
        )}

        {doc.metadata.package && (
          <div className="mb-4">
            <span className="text-gray-400">Package: </span>
            <code className="bg-gray-800 px-2 py-1 rounded text-blue-400">{doc.metadata.package}</code>
          </div>
        )}

        {doc.metadata.type && (
          <div className="mb-4">
            <span className="text-gray-400">Type: </span>
            <span className="text-yellow-400">{doc.metadata.type}</span>
          </div>
        )}

        {doc.metadata.inherits && (
          <div className="mb-4">
            <span className="text-gray-400">Inherits: </span>
            <code className="bg-gray-800 px-2 py-1 rounded text-purple-400">{doc.metadata.inherits}</code>
          </div>
        )}

        {doc.metadata.description && (
          <p className="text-gray-300 mb-6">{doc.metadata.description}</p>
        )}

        {doc.sections.map((section, idx) => (
          <Section
            key={idx}
            section={section}
            onReferenceClick={onReferenceClick}
          />
        ))}

        {doc.references.length > 0 && (
          <div className="mt-8 pt-4 border-t border-gray-700">
            <h3 className="text-lg font-semibold text-white mb-2">See Also</h3>
            <ul className="space-y-1">
              {doc.references.map((ref, idx) => (
                <li key={idx}>
                  <button
                    onClick={() => onReferenceClick(ref)}
                    className="text-blue-400 hover:text-blue-300 hover:underline"
                  >
                    {ref}
                  </button>
                </li>
              ))}
            </ul>
          </div>
        )}
      </div>
    </div>
  )
}

interface SectionProps {
  section: import('@/lib/types').DocSection
  onReferenceClick: (ref: string) => void
}

const Section = ({ section, onReferenceClick }: SectionProps) => {
  const level = Math.min(section.level + 1, 6)
  const headingClass = clsx(
    'font-semibold text-white mb-3',
    section.level === 1 ? 'text-xl' : 'text-lg'
  )
  
  const renderHeading = () => {
    switch (level) {
      case 2: return <h2 className={headingClass}>{section.title}</h2>
      case 3: return <h3 className={headingClass}>{section.title}</h3>
      case 4: return <h4 className={headingClass}>{section.title}</h4>
      case 5: return <h5 className={headingClass}>{section.title}</h5>
      case 6: return <h6 className={headingClass}>{section.title}</h6>
      default: return <h2 className={headingClass}>{section.title}</h2>
    }
  }

  return (
    <section className="mb-6">
      {renderHeading()}

      <div className="space-y-3">
        {section.content.map((item, idx) => {
          if (item.type === 'table') {
            return <TableContent key={idx} table={item.data as DocTable} />
          }
          if (item.type === 'code') {
            return <CodeContent key={idx} code={item.data as DocCodeBlock} />
          }
          return <TextContent key={idx} text={item.data as string} onReferenceClick={onReferenceClick} />
        })}
      </div>
    </section>
  )
}

const TextContent = ({ text, onReferenceClick }: { text: string; onReferenceClick: (ref: string) => void }) => {
  const renderText = () => {
    const parts = text.split(/(@see\s+[^\s]+)/g)
    return parts.map((part, idx) => {
      const match = part.match(/@see\s+([^\s]+)/)
      if (match) {
        return (
          <button
            key={idx}
            onClick={() => onReferenceClick(match[1])}
            className="text-blue-400 hover:text-blue-300 hover:underline"
          >
            {part}
          </button>
        )
      }
      return <span key={idx}>{part}</span>
    })
  }

  return <p className="text-gray-300">{renderText()}</p>
}

const TableContent = ({ table }: { table: DocTable }) => {
  if (!table.headers.length || !table.rows.length) return null

  return (
    <div className="overflow-x-auto">
      <table className="w-full border-collapse text-sm">
        <thead>
          <tr className="bg-gray-800">
            {table.headers.map((header, idx) => (
              <th key={idx} className="border border-gray-600 px-3 py-2 text-left text-gray-200 font-semibold">
                {header}
              </th>
            ))}
          </tr>
        </thead>
        <tbody>
          {table.rows.map((row, rowIdx) => (
            <tr key={rowIdx} className="hover:bg-gray-800/50">
              {row.map((cell, cellIdx) => (
                <td key={cellIdx} className="border border-gray-600 px-3 py-2 text-gray-300">
                  {cell}
                </td>
              ))}
            </tr>
          ))}
        </tbody>
      </table>
    </div>
  )
}

const CodeContent = ({ code }: { code: DocCodeBlock }) => {
  return (
    <pre className="bg-gray-900 border border-gray-700 rounded-lg p-4 overflow-x-auto">
      <code className={`language-${code.language || 'text'} text-sm text-gray-200`}>
        {code.code}
      </code>
    </pre>
  )
}