# code_editor.py
import streamlit as st
import streamlit_ace as st_ace
from utils import execute_code

def render_code_editor(selected_lang, ace_theme, editor_key):
    st.subheader("Editor")
    default_snippet = {
        "Python": '''# default code\na = int(input())\nb = int(input())\nprint("Sum:", a + b)''',
        "C": '''// default code\n#include <stdio.h>\nint main() {\n    int a, b;\n    scanf("%d %d", &a, &b);\n    printf("Sum: %d\\n", a + b);\n    return 0;\n}''',
        "C++": '''// default code\n#include <iostream>\nusing namespace std;\nint main() {\n    int a, b;\n    cin >> a >> b;\n    cout << "Sum: " << a + b << endl;\n    return 0;\n}''',
        "Java": '''// default code\nimport java.util.Scanner;\npublic class Program {\n    public static void main(String[] args) {\n        Scanner sc = new Scanner(System.in);\n        int a = sc.nextInt();\n        int b = sc.nextInt();\n        System.out.println("Sum: " + (a + b));\n    }\n}''',
        "JavaScript": '''// default code\nconst readline = require('readline');\nconst rl = readline.createInterface({ input: process.stdin, output: process.stdout });\nlet inputs = [];\nrl.on('line', (line) => {\n  inputs.push(parseInt(line));\n  if (inputs.length === 2) {\n    console.log("Sum:", inputs[0] + inputs[1]);\n    rl.close();\n  }\n});''',
        "C#": '''// default code\nusing System;\npublic class Program {\n    public static void Main(string[] args) {\n        int a = Convert.ToInt32(Console.ReadLine());\n        int b = Convert.ToInt32(Console.ReadLine());\n        Console.WriteLine("Sum: " + (a + b));\n    }\n}'''
    }
    code = st_ace.st_ace(
        value=st.session_state.code,
        placeholder=f"Start typing your {selected_lang} code…",
        language=selected_lang.lower() if selected_lang != "C++" else "c_cpp",
        theme=ace_theme,
        keybinding="vscode",
        font_size=14,
        min_lines=20,
        show_gutter=True,
        wrap=True,
        auto_update=True,
        key=editor_key
    )

    if code != st.session_state.code:
        st.session_state.code = code

    user_input = st.text_area(
        label="📥 Input (stdin)",
        value=st.session_state.stdin,
        placeholder="Enter input() values here, one per line",
        height=100,
        key="stdin_input"
    )
    if user_input != st.session_state.stdin:
        st.session_state.stdin = user_input

    if st.button("▶️ Run"):
        out, err, exc = execute_code(
            code=st.session_state.code,
            stdin=st.session_state.stdin,
            language=selected_lang
        )
        st.session_state.code_output = out
        st.session_state.error_output = err or exc

    if st.session_state.get("code_output"):
        st.text_area("Output", st.session_state.code_output, height=120)

    if st.session_state.get("error_output"):
        st.error(st.session_state.error_output)