// JavaScript VM executor for ChatGPT reverse engineering
use crate::utils::{Result, Utils};
use crate::vm::{Decompiler, Parser};
use base64::{Engine as _, engine::general_purpose};
use rand::Rng;
use serde_json::{Map, Value};
use std::collections::HashMap;

/// Virtual Machine for executing turnstile challenges
pub struct VM;

impl VM {
    /// HTML object used in VM calculations
    const HTML_OBJECT: &'static str = r#"{"x":0,"y":1219,"width":37.8125,"height":30,"top":1219,"right":37.8125,"bottom":1249,"left":0}"#;

    /// Generate turnstile token (simplified)
    pub fn get_turnstile(_bytecode: &str, _token: &str, _ip_info: &str) -> Result<String> {
        // Placeholder implementation: real logic would parse bytecode and token to
        // compute the turnstile token. For now, keep a deterministic shape so the
        // rest of the pipeline can execute.
        Ok(format!(
            "0.{}.{}",
            chrono::Utc::now().timestamp(),
            rand::random::<u32>()
        ))
    }

    /// Decompile VM bytecode to JavaScript
    pub fn decompile_vm(turnstile: &str, token: &str) -> Result<String> {
        Decompiler::decompile_vm(turnstile, token)
    }

    /// Parse keys from decompiled JavaScript
    pub fn parse_keys(decompiled_code: &str) -> Result<(String, HashMap<String, String>)> {
        Parser::parse_keys(decompiled_code)
    }

    /// Execute JavaScript code and extract result
    ///
    /// Note: This is a simplified stub. Full implementation would require
    /// a JavaScript engine like V8 or QuickJS bindings
    pub fn execute_js(_code: &str) -> Result<String> {
        // In a full implementation, this would:
        // 1. Create a JavaScript context
        // 2. Execute the decompiled code
        // 3. Extract the result

        // For now, return a placeholder
        Ok("{}".to_string())
    }

    /// XOR two strings
    pub fn xor(data: &str, key: &str) -> String {
        Utils::xor_strings(data, key)
    }

    /// Add values to VM payload based on extracted operations
    pub fn add_vm_values(
        payload: &mut Map<String, Value>,
        xor_key: &str,
        ip_info: &str,
    ) -> Result<()> {
        let mut rng = rand::rng();

        // Random values
        let random1: f64 = rng.random();
        let random2: f64 = rng.random();

        payload.insert(
            "19.33".to_string(),
            Value::String(
                general_purpose::STANDARD
                    .encode(Self::xor(&format!("{}", random1 + 0.6), xor_key).as_bytes()),
            ),
        );

        payload.insert(
            "56.04".to_string(),
            Value::String(
                general_purpose::STANDARD
                    .encode(Self::xor(r#"["Google Inc.","Win32",8,0]"#, xor_key).as_bytes()),
            ),
        );

        payload.insert(
            "14.85".to_string(),
            Value::String(
                general_purpose::STANDARD.encode(Self::xor(Self::HTML_OBJECT, xor_key).as_bytes()),
            ),
        );

        payload.insert(
            "31.17".to_string(),
            Value::String(general_purpose::STANDARD.encode(
                Self::xor("oai/apps/hasDismissedTeamsNoAuthUpsell,oai-did", xor_key).as_bytes(),
            )),
        );

        payload.insert(
            "7.1".to_string(),
            Value::String(
                general_purpose::STANDARD
                    .encode(Self::xor(&rng.random_range(1..5).to_string(), xor_key).as_bytes()),
            ),
        );

        payload.insert(
            "75.89".to_string(),
            Value::String(general_purpose::STANDARD.encode(Self::xor(ip_info, xor_key).as_bytes())),
        );

        payload.insert(
            "84.91".to_string(),
            Value::String(
                general_purpose::STANDARD
                    .encode(Self::xor("https://chatgpt.com/", xor_key).as_bytes()),
            ),
        );

        payload.insert(
            "30.7".to_string(),
            Value::String(
                general_purpose::STANDARD
                    .encode(Self::xor(&random1.to_string(), &random1.to_string()).as_bytes()),
            ),
        );

        payload.insert(
            "27.36".to_string(),
            Value::Number(serde_json::Number::from_f64(random2).unwrap()),
        );

        Ok(())
    }

    /// Simplified bytecode decompiler (placeholder for complex implementation)
    pub fn decompile_bytecode(_bytecode: &str) -> Result<HashMap<String, String>> {
        // This is a placeholder for the complex JavaScript decompiler
        // In the real implementation, this would parse and execute the bytecode

        let mut operations = HashMap::new();

        // These would be extracted from the actual bytecode
        operations.insert("xor_key".to_string(), "48.51".to_string());
        operations.insert("19.33".to_string(), "random_add".to_string());
        operations.insert("56.04".to_string(), "vendor".to_string());
        operations.insert("14.85".to_string(), "element".to_string());
        operations.insert("31.17".to_string(), "localstorage".to_string());
        operations.insert("7.1".to_string(), "history".to_string());
        operations.insert("75.89".to_string(), "ipinfo".to_string());
        operations.insert("84.91".to_string(), "location".to_string());
        operations.insert("30.7".to_string(), "random_1".to_string());
        operations.insert("27.36".to_string(), "random_2".to_string());

        Ok(operations)
    }

    /// Process and execute VM bytecode with full pipeline
    pub fn process_bytecode(
        turnstile: &str,
        token: &str,
        ip_info: &str,
    ) -> Result<Map<String, Value>> {
        // Step 1: Decompile bytecode
        let decompiled = Self::decompile_vm(turnstile, token)?;

        // Step 2: Parse keys from decompiled code
        let (xor_key, _parsed_keys) = Self::parse_keys(&decompiled)?;

        // Step 3: Build payload
        let mut payload = Map::new();
        Self::add_vm_values(&mut payload, &xor_key, ip_info)?;

        Ok(payload)
    }
}