'use client';
import {
  ClipboardDocumentCheckIcon,
  ClipboardDocumentIcon,
  SparklesIcon,
} from '@heroicons/react/24/outline';
import { JSX, ReactNode, useEffect, useState } from 'react';
// @ts-ignore
import { CopyToClipboard } from 'react-copy-to-clipboard';
// @ts-ignore
import SyntaxHighlighter from 'react-syntax-highlighter';
import { CodeOutput } from './fences/code-output';
import { TerminalOutput } from './fences/terminal-output';

import { Selector } from './selector';

function resolveLanguage(lang: string) {
  switch (lang) {
    case 'ts':
      return 'typescript';
    case 'js':
      return 'javascript';
    default:
      return lang;
  }
}

function CodeWrapper(options: {
  fileName: string;
  command: string;
  path: string;
  language: string;
  children: string; // intentionally typed as such
}): ({ children }: { children: ReactNode }) => JSX.Element {
  return ({ children }: { children: ReactNode }) =>
    options.language === 'shell' ? (
      <TerminalOutput command={options.children} path="" content={null} />
    ) : options.command ? (
      <TerminalOutput
        content={children}
        command={options.command}
        path={options.path}
      />
    ) : (
      <CodeOutput content={children} fileName={options.fileName} />
    );
}

// pre-process the highlightLines to expand ranges like
// ["8-10", 19, 22] => [8,9,10,19,22]
function processHighlightLines(highlightLines: any): number[] {
  const expandRange = (range: any) => {
    const [start, end] = range.split('-').map(Number);
    return Array.from({ length: end - start + 1 }, (_, i) => start + i);
  };

  // Process each item in the array
  return (
    highlightLines
      .map((item: any) => {
        if (typeof item === 'string' && item.includes('-')) {
          return expandRange(item);
        }
        return Number(item);
      })
      .flat()
      // remove duplicates
      .filter(
        (value: any, index: number, self: number[]) =>
          self.indexOf(value) === index
      )
  );
}

export interface FenceProps {
  children: string;
  command: string;
  path: string;
  fileName: string;
  highlightLines: number[];
  lineGroups: Record<string, number[]>;
  language: string;
  enableCopy: boolean;
  skipRescope?: boolean;
  selectedLineGroup?: string;
  onLineGroupSelectionChange?: (selection: string) => void;
}

export function Fence({
  children,
  command,
  path,
  fileName,
  lineGroups,
  highlightLines,
  language,
  enableCopy,
  selectedLineGroup,
  skipRescope,
  onLineGroupSelectionChange,
}: FenceProps) {
  if (highlightLines) {
    highlightLines = processHighlightLines(highlightLines);
  }

  function lineNumberStyle(lineNumber: number) {
    if (
      (highlightLines && highlightLines.includes(lineNumber)) ||
      (selectedLineGroup &&
        lineGroups[selectedLineGroup] &&
        lineGroups[selectedLineGroup].includes(lineNumber))
    ) {
      return {
        fontSize: 0,
        display: 'inline-block',
        position: 'absolute',
        left: 0,
        right: 0,
        zIndex: -1,
        borderLeftStyle: 'solid',
        borderLeftWidth: 10,
        lineHeight: '21px',
      };
    }
    return {
      fontSize: 0,
      position: 'absolute',
    };
  }

  const highlightOptions = Object.keys(lineGroups).map((lineNumberKey) => ({
    label: lineNumberKey,
    value: lineNumberKey,
  }));
  if (highlightOptions.length > 0) {
    highlightOptions.unshift({
      label: 'No highlighting',
      value: '',
    });
  }
  let selectedOption =
    highlightOptions.find((option) => option.value === selectedLineGroup) ||
    highlightOptions[0];
  const [copied, setCopied] = useState(false);
  useEffect(() => {
    let t: NodeJS.Timeout;
    if (copied) {
      t = setTimeout(() => {
        setCopied(false);
      }, 3000);
    }
    return () => {
      t && clearTimeout(t);
    };
  }, [copied]);

  function highlightChange(item: { label: string; value: string }) {
    onLineGroupSelectionChange?.(item.value);
  }

  return (
    <div className="code-block group relative w-full">
      <div>
        <div className="absolute right-0 top-0 z-10 flex">
          {enableCopy && enableCopy === true && (
            <CopyToClipboard
              text={command && command !== '' ? command : children}
              onCopy={() => {
                setCopied(true);
              }}
            >
              <button
                type="button"
                className={
                  'not-prose flex border border-slate-200 bg-slate-50/50 p-2 opacity-0 transition-opacity group-hover:opacity-100 dark:border-slate-700 dark:bg-slate-800/60' +
                  (highlightOptions && highlightOptions[0]
                    ? ''
                    : ' rounded-tr-lg')
                }
              >
                {copied ? (
                  <ClipboardDocumentCheckIcon className="h-5 w-5 text-blue-500 dark:text-sky-500" />
                ) : (
                  <ClipboardDocumentIcon className="h-5 w-5" />
                )}
              </button>
            </CopyToClipboard>
          )}
          {highlightOptions && highlightOptions[0] && (
            <Selector
              className="rounded-tr-lg"
              items={highlightOptions}
              selected={selectedOption}
              onChange={highlightChange}
            >
              <SparklesIcon className="mr-1 h-5 w-5"></SparklesIcon>
            </Selector>
          )}
        </div>
        <SyntaxHighlighter
          useInlineStyles={false}
          showLineNumbers={true}
          lineNumberStyle={lineNumberStyle}
          language={resolveLanguage(language)}
          children={children}
          PreTag={CodeWrapper({
            fileName,
            command,
            path,
            language,
            children,
          })}
        />
      </div>
    </div>
  );
}
