//! Replay testing suite for comprehensive REPL coverage
//!
//! [TEST-COV-003] Replay Testing Coverage

use ruchy::runtime::{
    replay::{SessionRecorder, SessionReplayer, TimestampedEvent},
    deterministic::{DeterministicRepl, MockTimeSource},
    assessment::{GradingEngine, GradeReport, GradingRubric, Assignment, Task, TestCase},
    Repl, ReplConfig,
};
use std::time::Duration;

#[test]
fn test_replay_basic_session() {
    let mut recorder = SessionRecorder::new();
    let mut repl = Repl::new().unwrap();
    
    // Record a session
    recorder.start_recording();
    
    let input1 = "let x = 42";
    let output1 = repl.eval(input1).unwrap_or_default();
    recorder.record_event(TimestampedEvent::Input(input1.to_string()));
    recorder.record_event(TimestampedEvent::Output(output1.clone()));
    
    let input2 = "x * 2";
    let output2 = repl.eval(input2).unwrap_or_default();
    recorder.record_event(TimestampedEvent::Input(input2.to_string()));
    recorder.record_event(TimestampedEvent::Output(output2.clone()));
    
    let session = recorder.stop_recording();
    
    // Replay the session
    let mut replayer = SessionReplayer::new(session);
    let mut repl2 = Repl::new().unwrap();
    
    assert!(replayer.replay(&mut repl2).is_ok());
    assert_eq!(replayer.get_outputs(), vec![output1, output2]);
}

#[test]
fn test_deterministic_execution() {
    let mut time_source = MockTimeSource::new(1000);
    let mut repl = DeterministicRepl::new(42, Box::new(time_source.clone()));
    
    // Test deterministic time
    assert_eq!(repl.get_timestamp(), 1000);
    time_source.advance(500);
    assert_eq!(repl.get_timestamp(), 1500);
    
    // Test deterministic RNG
    let rand1 = repl.random();
    let rand2 = repl.random();
    assert_ne!(rand1, rand2); // Different values
    
    // Reset and verify same sequence
    let mut repl2 = DeterministicRepl::new(42, Box::new(MockTimeSource::new(1000)));
    assert_eq!(repl2.random(), rand1);
    assert_eq!(repl2.random(), rand2);
}

#[test]
fn test_grading_engine() {
    let rubric = GradingRubric {
        correctness_weight: 0.5,
        performance_weight: 0.2,
        style_weight: 0.2,
        documentation_weight: 0.1,
    };
    
    let assignment = Assignment {
        id: "test1".to_string(),
        title: "Basic Math".to_string(),
        description: "Implement basic arithmetic".to_string(),
        tasks: vec![
            Task {
                id: "task1".to_string(),
                description: "Add two numbers".to_string(),
                test_cases: vec![
                    TestCase {
                        input: "1 + 1".to_string(),
                        expected: ruchy::runtime::assessment::ExpectedBehavior::ExactOutput("2".to_string()),
                        hidden: false,
                    },
                ],
                points: 10,
            },
        ],
        setup: None,
        teardown: None,
        timeout: Duration::from_secs(5),
    };
    
    let mut engine = GradingEngine::new(rubric);
    let submission = "// Solution\n1 + 1";
    
    let report = engine.grade(&assignment, submission);
    assert!(report.total_score > 0.0);
}

#[test]
fn test_session_state_tracking() {
    let mut recorder = SessionRecorder::new();
    recorder.start_recording();
    
    // Track different event types
    recorder.record_event(TimestampedEvent::Input("let x = 1".to_string()));
    recorder.record_event(TimestampedEvent::Output("1".to_string()));
    recorder.record_event(TimestampedEvent::StateChange("x".to_string(), "1".to_string()));
    recorder.record_event(TimestampedEvent::Error("test error".to_string()));
    
    let session = recorder.stop_recording();
    assert_eq!(session.events.len(), 4);
}

#[test]
fn test_replay_with_state_validation() {
    let mut recorder = SessionRecorder::new();
    let mut repl = Repl::new().unwrap();
    
    recorder.start_recording();
    
    // Create a session with state changes
    repl.eval("let mut count = 0").ok();
    recorder.record_event(TimestampedEvent::Input("let mut count = 0".to_string()));
    recorder.record_event(TimestampedEvent::StateChange("count".to_string(), "0".to_string()));
    
    repl.eval("count = count + 1").ok();
    recorder.record_event(TimestampedEvent::Input("count = count + 1".to_string()));
    recorder.record_event(TimestampedEvent::StateChange("count".to_string(), "1".to_string()));
    
    let session = recorder.stop_recording();
    
    // Replay and validate state
    let mut replayer = SessionReplayer::new(session);
    let mut repl2 = Repl::new().unwrap();
    
    assert!(replayer.replay_with_validation(&mut repl2).is_ok());
}

#[test]
fn test_resource_tracking() {
    let mut recorder = SessionRecorder::new();
    recorder.start_recording();
    
    // Track resource usage
    recorder.track_resource_usage(100, 50, Duration::from_millis(10));
    recorder.track_resource_usage(150, 60, Duration::from_millis(20));
    
    let session = recorder.stop_recording();
    assert!(!session.resource_usage.is_empty());
}

#[test]
fn test_checkpoint_restore() {
    let mut repl = Repl::new().unwrap();
    
    // Create initial state
    repl.eval("let x = 10").ok();
    repl.eval("let y = 20").ok();
    
    // Save checkpoint
    let checkpoint = repl.save_checkpoint();
    assert!(checkpoint.bindings.contains_key("x"));
    assert!(checkpoint.bindings.contains_key("y"));
    
    // Modify state
    repl.eval("let z = 30").ok();
    
    // Restore checkpoint
    assert!(repl.restore_checkpoint(checkpoint).is_ok());
    
    // Verify restoration
    assert!(repl.eval("x").is_ok());
    assert!(repl.eval("y").is_ok());
    assert!(repl.eval("z").is_err()); // z should not exist
}

#[test]
fn test_plagiarism_detection() {
    use ruchy::runtime::assessment::PlagiarismDetector;
    
    let mut detector = PlagiarismDetector::new(0.8);
    
    let code1 = "fun add(a, b) { a + b }";
    let code2 = "fun add(x, y) { x + y }"; // Similar structure
    let code3 = "fun multiply(a, b) { a * b }"; // Different
    
    detector.add_submission("student1", code1);
    detector.add_submission("student2", code2);
    detector.add_submission("student3", code3);
    
    let similarities = detector.find_similarities();
    
    // student1 and student2 should be similar
    assert!(similarities.iter().any(|(s1, s2, _)| 
        (s1 == "student1" && s2 == "student2") || 
        (s1 == "student2" && s2 == "student1")
    ));
}

#[test]
fn test_secure_sandbox() {
    use ruchy::runtime::assessment::SecureSandbox;
    
    let sandbox = SecureSandbox::new(
        1024 * 1024, // 1MB memory
        Duration::from_secs(1),
        100, // max stack depth
    );
    
    // Safe code should work
    let result = sandbox.execute("1 + 1");
    assert!(result.is_ok());
    
    // Infinite loop should timeout
    let result = sandbox.execute("while true { }");
    assert!(result.is_err());
}

#[test]
fn test_educational_features() {
    let mut repl = Repl::new().unwrap();
    
    // Test educational commands
    repl.eval(":help").ok();
    repl.eval(":examples").ok();
    repl.eval(":explain let").ok();
    
    // These commands provide educational content
}