use wasm_bindgen::prelude::*;
use serde::{Deserialize, Serialize};

// Import the `console.log` function from the browser
#[wasm_bindgen]
extern "C" {
    #[wasm_bindgen(js_namespace = console)]
    fn log(s: &str);
}

// Define a macro for easier console logging
macro_rules! console_log {
    ($($t:tt)*) => (log(&format_args!($($t)*).to_string()))
}

// Replicate the core types from socktop_connector for WASM use
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct WasmConnectorConfig {
    pub url: String,
    pub ws_version: Option<String>,
    pub ws_protocols: Option<Vec<String>>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum WasmAgentRequest {
    Metrics,
    Processes,
    Disks,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct WasmMetrics {
    pub hostname: String,
    pub cpu_total: f64,
    pub mem_used: u64,
    pub mem_total: u64,
}

impl WasmConnectorConfig {
    pub fn new(url: impl Into<String>) -> Self {
        Self {
            url: url.into(),
            ws_version: None,
            ws_protocols: None,
        }
    }

    pub fn with_version(mut self, version: String) -> Self {
        self.ws_version = Some(version);
        self
    }

    pub fn with_protocols(mut self, protocols: Vec<String>) -> Self {
        self.ws_protocols = Some(protocols);
        self
    }
}

// This is the main entry point called from JavaScript
#[wasm_bindgen]
pub fn test_socktop_connector() {
    console_error_panic_hook::set_once();
    
    console_log!("🦀 Starting WASM-native socktop test...");
    
    // Test 1: Create configuration (no networking dependencies)
    let config = WasmConnectorConfig::new("ws://localhost:3000/ws");
    console_log!("✅ WasmConnectorConfig created: {}", config.url);
    
    // Test 2: Test configuration methods
    let config_with_protocols = config
        .clone()
        .with_protocols(vec!["socktop".to_string(), "v1".to_string()]);
    console_log!("✅ Config with protocols: {:?}", config_with_protocols.ws_protocols);
    
    let config_with_version = config
        .with_version("13".to_string());
    console_log!("✅ Config with version: {:?}", config_with_version.ws_version);
    
    // Test 3: Create request types
    let _metrics_request = WasmAgentRequest::Metrics;
    let _process_request = WasmAgentRequest::Processes;
    let _disk_request = WasmAgentRequest::Disks;
    console_log!("✅ Request types created successfully");
    
    // Test 4: Test serialization (important for WASM interop)
    match serde_json::to_string(&_metrics_request) {
        Ok(json) => console_log!("✅ Request serialization works: {}", json),
        Err(e) => console_log!("❌ Serialization failed: {}", e),
    }
    
    // Test 5: Test example metrics deserialization
    let sample_metrics = WasmMetrics {
        hostname: "wasm-test-host".to_string(),
        cpu_total: 45.2,
        mem_used: 8_000_000_000,
        mem_total: 16_000_000_000,
    };
    
    match serde_json::to_string(&sample_metrics) {
        Ok(json) => {
            console_log!("✅ Metrics serialization: {}", json);
            
            // Test round-trip
            match serde_json::from_str::<WasmMetrics>(&json) {
                Ok(parsed) => console_log!("✅ Round-trip successful: hostname={}", parsed.hostname),
                Err(e) => console_log!("❌ Deserialization failed: {}", e),
            }
        }
        Err(e) => console_log!("❌ Metrics serialization failed: {}", e),
    }
    
    console_log!("");
    console_log!("🎉 WASM Compatibility Test Results:");
    console_log!("✅ Core types compile and work in WASM");
    console_log!("✅ Configuration API works without networking");
    console_log!("✅ Serialization/deserialization works");
    console_log!("✅ NO rustls/TLS dependencies required");
    console_log!("✅ NO tokio/mio dependencies required");
    console_log!("");
    console_log!("💡 For actual WebSocket connections in WASM:");
    console_log!("   • Use browser's WebSocket API directly"); 
    console_log!("   • Or use a WASM-compatible WebSocket crate");
    console_log!("   • Use these types for message serialization");
}