//! Message Handling Tests
//!
//! Tests for the GuiMessage enum and message processing logic.

#![cfg(feature = "gui")]

use std::time::Duration;
use tokio::sync::mpsc;

#[test]
fn test_message_channel_creation() {
    // Test that we can create message channels
    let (tx, mut rx) = mpsc::channel::<String>(1);

    // Verify channel works
    tokio::runtime::Runtime::new().unwrap().block_on(async {
        tx.send("test".to_string()).await.unwrap();
        let received = rx.recv().await.unwrap();
        assert_eq!(received, "test");
    });
}

#[tokio::test]
async fn test_async_message_sending() {
    let (tx, mut rx) = mpsc::channel::<String>(10);

    // Send multiple messages
    tx.send("message1".to_string()).await.unwrap();
    tx.send("message2".to_string()).await.unwrap();
    tx.send("message3".to_string()).await.unwrap();

    // Receive and verify
    assert_eq!(rx.recv().await.unwrap(), "message1");
    assert_eq!(rx.recv().await.unwrap(), "message2");
    assert_eq!(rx.recv().await.unwrap(), "message3");
}

#[tokio::test]
async fn test_message_channel_capacity() {
    let (tx, mut rx) = mpsc::channel::<String>(2);

    // Fill the channel
    tx.send("msg1".to_string()).await.unwrap();
    tx.send("msg2".to_string()).await.unwrap();

    // Try to send another message (should work with try_send)
    let result = tx.try_send("msg3".to_string());

    // Channel is full, so this should fail
    assert!(result.is_err());

    // Receive one message to make space
    rx.recv().await.unwrap();

    // Now sending should work
    tx.send("msg3".to_string()).await.unwrap();
}

#[tokio::test]
async fn test_message_channel_closed() {
    let (tx, rx) = mpsc::channel::<String>(1);

    // Drop the receiver
    drop(rx);

    // Sending should fail
    let result = tx.send("test".to_string()).await;
    assert!(result.is_err());
}

#[tokio::test]
async fn test_multiple_senders() {
    let (tx, mut rx) = mpsc::channel::<String>(10);

    let tx1 = tx.clone();
    let tx2 = tx.clone();

    // Spawn tasks that send messages
    let handle1 = tokio::spawn(async move {
        tx1.send("from_sender1".to_string()).await.unwrap();
    });

    let handle2 = tokio::spawn(async move {
        tx2.send("from_sender2".to_string()).await.unwrap();
    });

    // Wait for both to complete
    handle1.await.unwrap();
    handle2.await.unwrap();

    // Receive both messages (order may vary)
    let mut messages = vec![rx.recv().await.unwrap(), rx.recv().await.unwrap()];
    messages.sort();

    assert_eq!(messages, vec!["from_sender1", "from_sender2"]);
}

#[tokio::test]
async fn test_message_timeout() {
    let (_tx, mut rx) = mpsc::channel::<String>(1);

    // Try to receive with timeout
    let result = tokio::time::timeout(Duration::from_millis(100), rx.recv()).await;

    // Should timeout since no message was sent
    assert!(result.is_err());
}

// Note: Tests for actual GuiMessage enum will be added once we
// refactor the message handling to be more testable (Task 3)

#[cfg(test)]
mod gui_message_tests {
    use super::*;

    // Tests for GuiMessage enum variants
    // These tests will verify the enhanced message system once implemented

    #[test]
    fn test_gui_message_enum_structure() {
        // This test will be expanded once GuiMessage is refactored
        // to be accessible from tests
        assert!(true);
    }

    #[test]
    fn test_service_management_messages() {
        // Test that service management message variants can be created
        // Will test: StartService, StopService, RefreshServices, ServiceStatusChanged
        assert!(true);
    }

    #[test]
    fn test_ai_generation_messages() {
        // Test existing AI message variants: AiGenerate, AiApplyYaml
        // Plus new variants: AiGenerationComplete
        assert!(true);
    }

    #[test]
    fn test_recording_messages() {
        // Test recording message variants:
        // StartRecording, StopRecording, CaptureRequest, GenerateFromRecording
        assert!(true);
    }

    #[test]
    fn test_editor_messages() {
        // Test editor message variants:
        // LoadServiceInEditor, SaveEditorContent, EditorContentChanged
        assert!(true);
    }

    #[test]
    fn test_import_export_messages() {
        // Test import/export message variants:
        // ImportFile, ExportService, BatchImport
        assert!(true);
    }

    #[test]
    fn test_code_generation_messages() {
        // Test code generation message variants:
        // GenerateCode, CopyToClipboard, SaveGeneratedCode
        assert!(true);
    }

    #[test]
    fn test_log_messages() {
        // Test log message variants:
        // NewRequestLog, ClearLogs, FilterLogsBy
        assert!(true);
    }

    #[test]
    fn test_config_messages() {
        // Test configuration message variants:
        // UpdateConfig, SaveConfig, LoadConfig
        assert!(true);
    }
}
