// REPL AND RUNTIME TESTS - Coverage for interactive components
// Sprint 80 Phase 28: Target REPL and runtime modules
// ALL NIGHT MARATHON CONTINUES!

use ruchy::runtime::completion::CompletionEngine;
use ruchy::runtime::repl::{Repl, ReplConfig};
use ruchy::runtime::Value;
use std::collections::HashMap;
use std::path::PathBuf;
use std::rc::Rc;

#[test]
fn test_repl_creation() {
    let repl = Repl::new(PathBuf::from("/tmp"));
    assert!(repl.is_ok());
}

#[test]
fn test_repl_with_config() {
    let config = ReplConfig::default();
    let repl = Repl::with_config(config);
    assert!(repl.is_ok());
}

#[test]
fn test_repl_config_default() {
    let config = ReplConfig::default();
    assert_eq!(config.max_memory, 1024 * 1024);
    assert!(!config.debug);
}

#[test]
fn test_repl_config_custom() {
    let config = ReplConfig {
        max_memory: 2048,
        timeout: std::time::Duration::from_millis(1000),
        maxdepth: 50,
        debug: true,
    };
    assert_eq!(config.max_memory, 2048);
    assert!(config.debug);
}

#[test]
fn test_completion_engine_new() {
    let engine = CompletionEngine::new();
    let _ = engine;
}

#[test]
fn test_completion_engine_basic() {
    let engine = CompletionEngine::new();
    // Test basic functionality without non-existent methods
    let _ = engine;
}

#[test]
fn test_completion_engine_add_function() {
    let mut engine = CompletionEngine::new();
    engine.add_function("print", 1);
    engine.add_function("println", 1);
    engine.add_function("format", 2);
}

#[test]
fn test_completion_engine_add_variable() {
    let mut engine = CompletionEngine::new();
    engine.add_variable("x");
    engine.add_variable("y");
    engine.add_variable("result");
}

#[test]
fn test_completion_engine_complete() {
    let mut engine = CompletionEngine::new();
    engine.add_keyword("let");
    engine.add_keyword("letterbox");

    let completions = engine.complete("le", 2);
    assert!(completions.len() >= 1);
}

#[test]
fn test_completion_engine_complete_empty() {
    let engine = CompletionEngine::new();
    let completions = engine.complete("", 0);
    assert_eq!(completions.len(), 0);
}

#[test]
fn test_environment_new() {
    let env = Environment::new();
    assert!(env.lookup("nonexistent").is_none());
}

#[test]
fn test_environment_default() {
    let env = Environment::default();
    assert!(env.lookup("nonexistent").is_none());
}

#[test]
fn test_environment_define() {
    let mut env = Environment::new();
    env.define("x", Value::Integer(42), false);
    assert_eq!(env.lookup("x"), Some(&Value::Integer(42)));
}

#[test]
fn test_environment_define_mutable() {
    let mut env = Environment::new();
    env.define("x", Value::Integer(42), true);
    env.set("x", Value::Integer(100));
    assert_eq!(env.lookup("x"), Some(&Value::Integer(100)));
}

#[test]
fn test_environment_set_undefined() {
    let mut env = Environment::new();
    env.set("undefined", Value::Integer(42));
    // Should not crash
}

#[test]
fn test_environment_lookup_undefined() {
    let env = Environment::new();
    assert!(env.lookup("undefined").is_none());
}

#[test]
fn test_environment_push_scope() {
    let mut env = Environment::new();
    env.push_scope();
    env.define("scoped", Value::Integer(1), false);
    assert!(env.lookup("scoped").is_some());
}

#[test]
fn test_environment_pop_scope() {
    let mut env = Environment::new();
    env.define("outer", Value::Integer(1), false);
    env.push_scope();
    env.define("inner", Value::Integer(2), false);
    env.pop_scope();
    assert!(env.lookup("outer").is_some());
    assert!(env.lookup("inner").is_none());
}

#[test]
fn test_environment_nested_scopes() {
    let mut env = Environment::new();
    for i in 0..10 {
        env.push_scope();
        env.define(&format!("var{}", i), Value::Integer(i), false);
    }
    for _ in 0..10 {
        env.pop_scope();
    }
}

#[test]
fn test_environment_clear() {
    let mut env = Environment::new();
    env.define("x", Value::Integer(1), false);
    env.define("y", Value::Integer(2), false);
    env.clear();
    assert!(env.lookup("x").is_none());
    assert!(env.lookup("y").is_none());
}

#[test]
fn test_environment_many_variables() {
    let mut env = Environment::new();
    for i in 0..1000 {
        env.define(&format!("var{}", i), Value::Integer(i), false);
    }
    for i in 0..1000 {
        assert_eq!(env.lookup(&format!("var{}", i)), Some(&Value::Integer(i)));
    }
}

#[test]
fn test_transactional_state_new() {
    let state = TransactionalState::new(1024);
    let _ = state;
}

#[test]
fn test_transactional_state_begin_transaction() {
    let mut state = TransactionalState::new(1024);
    let tx = state.begin_transaction(Default::default());
    assert!(tx.is_ok());
}

#[test]
fn test_transactional_state_commit() {
    let mut state = TransactionalState::new(1024);
    let tx = state.begin_transaction(Default::default()).unwrap();
    state.insert_binding("x".to_string(), Value::Integer(42), false);
    let result = state.commit_transaction(tx);
    assert!(result.is_ok());
}

#[test]
fn test_transactional_state_rollback() {
    let mut state = TransactionalState::new(1024);
    let tx = state.begin_transaction(Default::default()).unwrap();
    state.insert_binding("x".to_string(), Value::Integer(42), false);
    let result = state.rollback_transaction(tx);
    assert!(result.is_ok());
}

#[test]
fn test_transactional_state_nested() {
    let mut state = TransactionalState::new(1024);
    let tx1 = state.begin_transaction(Default::default()).unwrap();
    let tx2 = state.begin_transaction(Default::default()).unwrap();
    state.rollback_transaction(tx2).unwrap();
    state.rollback_transaction(tx1).unwrap();
}

#[test]
fn test_transactional_state_insert_binding() {
    let mut state = TransactionalState::new(1024);
    state.insert_binding("x".to_string(), Value::Integer(42), false);
    // Should not crash
}

#[test]
fn test_transactional_state_clear() {
    let mut state = TransactionalState::new(1024);
    state.insert_binding("x".to_string(), Value::Integer(42), false);
    state.clear();
    // Should be cleared
}

#[test]
fn test_value_integer_ops() {
    let v1 = Value::Integer(10);
    let v2 = Value::Integer(20);
    assert_ne!(v1, v2);
    assert_eq!(v1, v1.clone());
}

#[test]
fn test_value_float_ops() {
    let v1 = Value::Float(3.14);
    let v2 = Value::Float(2.71);
    assert_ne!(v1, v2);
    assert_eq!(v1, v1.clone());
}

#[test]
fn test_value_bool_ops() {
    let v1 = Value::Bool(true);
    let v2 = Value::Bool(false);
    assert_ne!(v1, v2);
    assert_eq!(v1, Value::Bool(true));
}

#[test]
fn test_value_string_ops() {
    let v1 = Value::String(Rc::from("hello"));
    let v2 = Value::String(Rc::from("world"));
    assert_ne!(v1, v2);
}

#[test]
fn test_value_unit_ops() {
    let v1 = Value::Unit;
    let v2 = Value::Unit;
    assert_eq!(v1, v2);
}

#[test]
fn test_value_list_ops() {
    let list = Value::List(Rc::new(vec![
        Value::Integer(1),
        Value::Integer(2),
        Value::Integer(3),
    ]));
    if let Value::List(l) = &list {
        assert_eq!(l.len(), 3);
    }
}

#[test]
fn test_value_tuple_ops() {
    let tuple = Value::Tuple(vec![Value::Integer(42), Value::Bool(true)].into());
    if let Value::Tuple(t) = &tuple {
        assert_eq!(t.len(), 2);
    }
}

#[test]
fn test_value_object_ops() {
    let mut map = HashMap::new();
    map.insert("x".to_string(), Value::Integer(10));
    map.insert("y".to_string(), Value::Integer(20));
    let obj = Value::Object(Rc::new(map));
    if let Value::Object(o) = &obj {
        assert_eq!(o.len(), 2);
    }
}

#[test]
fn test_value_display() {
    assert_eq!(format!("{}", Value::Integer(42)), "42");
    assert_eq!(format!("{}", Value::Float(3.14)), "3.14");
    assert_eq!(format!("{}", Value::Bool(true)), "true");
    assert_eq!(format!("{}", Value::Bool(false)), "false");
    assert_eq!(format!("{}", Value::Unit), "()");
    assert_eq!(format!("{}", Value::String(Rc::from("test"))), "test");
}

#[test]
fn test_value_debug() {
    let val = Value::Integer(42);
    let debug = format!("{:?}", val);
    assert!(debug.contains("Integer"));
}

#[test]
fn test_value_clone() {
    let val = Value::Integer(42);
    let cloned = val.clone();
    assert_eq!(val, cloned);
}

#[test]
fn test_value_partial_eq() {
    assert!(Value::Integer(42) == Value::Integer(42));
    assert!(Value::Integer(42) != Value::Integer(43));
    assert!(Value::Float(3.14) == Value::Float(3.14));
    assert!(Value::Bool(true) == Value::Bool(true));
    assert!(Value::Bool(false) != Value::Bool(true));
}

#[test]
fn test_runtime_memory_safety() {
    // Test Rc reference counting
    let s1 = Rc::new("shared".to_string());
    let s2 = Rc::clone(&s1);
    let s3 = Rc::clone(&s1);
    assert_eq!(Rc::strong_count(&s1), 3);
    drop(s2);
    assert_eq!(Rc::strong_count(&s1), 2);
    drop(s3);
    assert_eq!(Rc::strong_count(&s1), 1);
}

#[test]
fn test_runtime_large_values() {
    let large_string = "x".repeat(10000);
    let val = Value::String(Rc::new(large_string));
    if let Value::String(s) = val {
        assert_eq!(s.len(), 10000);
    }
}

#[test]
fn test_runtime_nested_structures() {
    let nested = Value::Array(Rc::new(vec![
        Value::Array(vec![Value::Integer(1), Value::Integer(2)].into()),
        Value::Array(vec![Value::Integer(3), Value::Integer(4)].into()),
    ]));
    if let Value::Array(outer) = nested {
        assert_eq!(outer.len(), 2);
        if let Value::Array(inner) = &outer[0] {
            assert_eq!(inner.len(), 2);
        }
    }
}

// ALL NIGHT continues with more runtime tests...
