"use client"

import { FitAddon } from "@xterm/addon-fit"
import { Terminal } from "@xterm/xterm"
import "./xterm.css"

import { debounce } from "@/lib/utils"
import { Loader2 } from "lucide-react"
import { useTheme } from "next-themes"
import { ElementRef, useEffect, useRef } from "react"
import { Socket } from "socket.io-client"
export default function EditorTerminal({
  socket,
  id,
  term,
  setTerm,
  visible,
}: {
  socket: Socket
  id: string
  term: Terminal | null
  setTerm: (term: Terminal) => void
  visible: boolean
}) {
  const { theme } = useTheme()
  const terminalContainerRef = useRef<ElementRef<"div">>(null)
  const fitAddonRef = useRef<FitAddon | null>(null)

  useEffect(() => {
    if (!terminalContainerRef.current) return
    // console.log("new terminal", id, term ? "reusing" : "creating");

    const terminal = new Terminal({
      cursorBlink: true,
      theme: theme === "light" ? lightTheme : darkTheme,
      fontFamily: "var(--font-geist-mono)",
      fontSize: 14,
      lineHeight: 1.5,
      letterSpacing: 0,
    })

    setTerm(terminal)
    const dispose = () => {
      terminal.dispose()
    }
    return dispose
  }, [])

  useEffect(() => {
    if (term) {
      term.options.theme = theme === "light" ? lightTheme : darkTheme
    }
  }, [theme])

  useEffect(() => {
    if (!term) return

    if (!terminalContainerRef.current) return
    if (!fitAddonRef.current) {
      const fitAddon = new FitAddon()
      term.loadAddon(fitAddon)
      term.open(terminalContainerRef.current)
      fitAddon.fit()
      fitAddonRef.current = fitAddon
    }

    const disposableOnData = term.onData((data) => {
      socket.emit("terminalData", { id, data })
    })

    const disposableOnResize = term.onResize((dimensions) => {
      fitAddonRef.current?.fit()
      socket.emit("terminalResize", { dimensions })
    })
    const resizeObserver = new ResizeObserver(
      debounce((entries) => {
        if (!fitAddonRef.current || !terminalContainerRef.current) return

        const entry = entries[0]
        if (!entry) return

        const { width, height } = entry.contentRect

        // Only call fit if the size has actually changed
        if (
          width !== terminalContainerRef.current.offsetWidth ||
          height !== terminalContainerRef.current.offsetHeight
        ) {
          try {
            fitAddonRef.current.fit()
          } catch (err) {
            console.error("Error during fit:", err)
          }
        }
      }, 50) // Debounce for 50ms
    )

    // start observing for resize
    resizeObserver.observe(terminalContainerRef.current)
    return () => {
      disposableOnData.dispose()
      disposableOnResize.dispose()
      resizeObserver.disconnect()
    }
  }, [term, terminalContainerRef.current])

  useEffect(() => {
    if (!term) return
    const handleTerminalResponse = (response: { id: string; data: string }) => {
      if (response.id === id) {
        term.write(response.data)
      }
    }
    socket.on("terminalResponse", handleTerminalResponse)

    return () => {
      socket.off("terminalResponse", handleTerminalResponse)
    }
  }, [term, id, socket])

  return (
    <>
      <div
        ref={terminalContainerRef}
        style={{ display: visible ? "block" : "none" }}
        className="w-full h-full text-left"
      >
        {term === null ? (
          <div className="flex items-center text-muted-foreground p-2">
            <Loader2 className="animate-spin mr-2 h-4 w-4" />
            <span>Connecting to terminal...</span>
          </div>
        ) : null}
      </div>
    </>
  )
}

const lightTheme = {
  foreground: "#2e3436",
  background: "#ffffff",
  black: "#2e3436",
  brightBlack: "#555753",
  red: "#cc0000",
  brightRed: "#ef2929",
  green: "#4e9a06",
  brightGreen: "#8ae234",
  yellow: "#c4a000",
  brightYellow: "#fce94f",
  blue: "#3465a4",
  brightBlue: "#729fcf",
  magenta: "#75507b",
  brightMagenta: "#ad7fa8",
  cyan: "#06989a",
  brightCyan: "#34e2e2",
  white: "#d3d7cf",
  brightWhite: "#eeeeec",
  cursor: "#2e3436",
  cursorAccent: "#ffffff",
  selectionBackground: "#3465a4",
  selectionForeground: "#ffffff",
  selectionInactiveBackground: "#264973",
}

// Dark Theme
const darkTheme = {
  foreground: "#f8f8f2",
  background: "#0a0a0a",
  black: "#21222c",
  brightBlack: "#6272a4",
  red: "#ff5555",
  brightRed: "#ff6e6e",
  green: "#50fa7b",
  brightGreen: "#69ff94",
  yellow: "#f1fa8c",
  brightYellow: "#ffffa5",
  blue: "#bd93f9",
  brightBlue: "#d6acff",
  magenta: "#ff79c6",
  brightMagenta: "#ff92df",
  cyan: "#8be9fd",
  brightCyan: "#a4ffff",
  white: "#f8f8f2",
  brightWhite: "#ffffff",
  cursor: "#f8f8f2",
  cursorAccent: "#0a0a0a",
  selectionBackground: "#264973",
  selectionForeground: "#ffffff",
  selectionInactiveBackground: "#1a3151",
}