//! EXTREME TDD: Actor Framework Infrastructure Tests (ACTOR-001)
//!
//! Test-first development for actor system test infrastructure.
//! NO IMPLEMENTATION YET - Pure tests driving design.
//! Target: 100% coverage for test framework utilities.

use ruchy::compile;
use std::collections::HashMap;
use std::time::Duration;

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

    // =============================================================================
    // TEST CONTEXT INFRASTRUCTURE TESTS
    // =============================================================================

    #[test]
    #[ignore = "Test infrastructure needs implementation"]
    fn test_context_creation() {
        let ctx = ActorTestContext::new();
        assert!(ctx.parser.is_some(), "Parser should be available");
        assert!(ctx.typechecker.is_some(), "Typechecker should be available");
        assert!(ctx.transpiler.is_some(), "Transpiler should be available");
        assert!(ctx.runtime.is_some(), "Runtime should be available");
    }

    #[test]
    #[ignore = "Test infrastructure needs implementation"]
    fn test_assert_parse_error() {
        let ctx = ActorTestContext::new();
        let input = "actor"; // Invalid: missing name and body

        ctx.assert_parse_error(
            input,
            ParseError::UnexpectedToken {
                expected: "identifier",
                found: "end of input",
            },
        );
    }

    #[test]
    #[ignore = "Test infrastructure needs implementation"]
    fn test_assert_type_error() {
        let ctx = ActorTestContext::new();
        let input = r#"
            actor TypeMismatch {
                receive test() {
                    let actor: ActorRef<String> = spawn Counter { value: 0 };
                }
            }
        "#;

        ctx.assert_type_error(
            input,
            TypeError::TypeMismatch {
                expected: "ActorRef<String>",
                found: "ActorRef<Counter>",
            },
        );
    }

    #[test]
    #[ignore = "Test infrastructure needs implementation"]
    fn test_assert_runtime_behavior() {
        let ctx = ActorTestContext::new();
        let program = r#"
            actor TestActor {
                value: i32,
                receive get() -> i32 { self.value }
            }

            async fn test() -> i32 {
                let actor = spawn TestActor { value: 42 };
                actor ? get()
            }
        "#;

        ctx.assert_runtime_behavior(program, |result: i32| {
            assert_eq!(result, 42);
        });
    }

    // =============================================================================
    // PARSER TEST MACRO TESTS
    // =============================================================================

    #[test]
    #[ignore = "Parser test macro needs implementation"]
    fn test_parser_test_macro_generation() {
        // Test that our parser_test! macro generates valid tests

        // This should generate a test function
        parser_test!(
            test_simple_actor,
            "actor Simple {}",
            AST::Actor(Actor {
                name: "Simple".to_string(),
                fields: vec![],
                receives: vec![],
                hooks: vec![],
            })
        );

        // Verify the generated test exists and passes
        // This is meta-testing: testing our test generation
        assert!(
            test_simple_actor_exists(),
            "Generated parser test should exist"
        );
    }

    #[test]
    #[ignore = "Parser test macro needs implementation"]
    fn test_parser_test_macro_with_complex_ast() {
        parser_test!(
            test_complex_actor,
            r#"
                actor Counter {
                    value: i32,
                    receive increment() {
                        self.value += 1
                    }
                }
            "#,
            AST::Actor(Actor {
                name: "Counter".to_string(),
                fields: vec![Field {
                    name: "value".to_string(),
                    ty: Type::I32
                }],
                receives: vec![Receive {
                    name: "increment".to_string(),
                    params: vec![],
                    return_type: None,
                    body: Block(vec![Expr::Assign {
                        target: Box::new(Expr::FieldAccess {
                            object: Box::new(Expr::Self_),
                            field: "value".to_string(),
                        }),
                        value: Box::new(Expr::Binary {
                            left: Box::new(Expr::FieldAccess {
                                object: Box::new(Expr::Self_),
                                field: "value".to_string(),
                            }),
                            op: BinaryOp::Add,
                            right: Box::new(Expr::Literal(Literal::Integer(1))),
                        }),
                    }])
                }],
                hooks: vec![],
            })
        );
    }

    // =============================================================================
    // PROPERTY TEST MACRO TESTS
    // =============================================================================

    #[test]
    #[ignore = "Property test macro needs implementation"]
    fn test_property_test_macro_generation() {
        // Test our property_test! macro
        property_test!(test_actor_parsing_never_panics, |input: ActorInput| {
            let ctx = ActorTestContext::new();
            let _ = ctx.parse(&input.source); // Should not panic
            true // Property: parsing never panics
        });
    }

    // =============================================================================
    // TEST INPUT GENERATION TESTS
    // =============================================================================

    #[test]
    #[ignore = "Test input generation needs implementation"]
    fn test_actor_input_generation() {
        let input = ActorInput::generate();

        assert!(
            !input.source.is_empty(),
            "Generated actor should have source"
        );
        assert!(
            input.source.contains("actor"),
            "Should contain actor keyword"
        );
        assert!(
            input.is_syntactically_valid(),
            "Generated input should be valid"
        );
    }

    #[test]
    #[ignore = "Test input generation needs implementation"]
    fn test_message_sequence_generation() {
        let sequence = MessageSequence::generate(10);

        assert_eq!(
            sequence.messages.len(),
            10,
            "Should generate requested number of messages"
        );
        assert!(sequence.is_ordered(), "Messages should be ordered");
        assert!(sequence.all_valid(), "All messages should be valid");
    }

    // =============================================================================
    // COMPILATION AND EXECUTION HELPERS TESTS
    // =============================================================================

    #[test]
    #[ignore = "Compilation helpers need implementation"]
    fn test_compile_and_run_helper() {
        let program = r#"
            actor Echo {
                receive echo(msg: String) -> String { msg }
            }

            async fn test() -> String {
                let actor = spawn Echo {};
                actor ? echo("hello")
            }
        "#;

        let result = compile_and_run(program);
        assert_eq!(result, Value::String("hello".to_string()));
    }

    #[test]
    #[ignore = "Compilation helpers need implementation"]
    fn test_compile_and_load_helper() {
        let program = r#"
            actor Counter {
                value: i32,
                receive increment() { self.value += 1 }
                receive get() -> i32 { self.value }
            }
        "#;

        let runtime = compile_and_load(program);
        assert!(
            runtime.has_actor_type("Counter"),
            "Should have Counter actor type"
        );

        let actor = runtime.spawn_actor("Counter", json!({"value": 0}));
        assert!(actor.is_ok(), "Should successfully spawn Counter actor");
    }

    // =============================================================================
    // ASSERTION HELPER TESTS
    // =============================================================================

    #[test]
    #[ignore = "Assertion helpers need implementation"]
    fn test_assert_contains_helper() {
        let code = "struct Actor { field: i32 }";

        assert_contains!(code, "struct Actor");
        assert_contains!(code, "field: i32");

        // Test failure case
        let result = std::panic::catch_unwind(|| {
            assert_contains!(code, "nonexistent");
        });
        assert!(result.is_err(), "Should panic on missing content");
    }

    #[test]
    #[ignore = "Assertion helpers need implementation"]
    fn test_assert_matches_helper() {
        let ast = AST::Actor(Actor {
            name: "Test".to_string(),
            fields: vec![],
            receives: vec![],
            hooks: vec![],
        });

        assert_matches!(ast, AST::Actor(Actor { name, .. }) if name == "Test");
    }

    // =============================================================================
    // TIMING AND PERFORMANCE TEST HELPERS
    // =============================================================================

    #[test]
    #[ignore = "Timing helpers need implementation"]
    fn test_timing_assertion() {
        let operation = || {
            std::thread::sleep(Duration::from_millis(10));
            42
        };

        assert_duration_under!(operation, Duration::from_millis(50));

        // Test failure case
        let slow_operation = || {
            std::thread::sleep(Duration::from_millis(100));
            42
        };

        let result = std::panic::catch_unwind(|| {
            assert_duration_under!(slow_operation, Duration::from_millis(50));
        });
        assert!(result.is_err(), "Should panic on slow operation");
    }

    #[test]
    #[ignore = "Performance helpers need implementation"]
    fn test_memory_usage_assertion() {
        let memory_heavy_operation = || {
            let _large_vec: Vec<i32> = (0..1000).collect();
        };

        assert_memory_under!(memory_heavy_operation, 1024 * 1024); // 1MB limit
    }

    // =============================================================================
    // ACTOR RUNTIME TEST HELPERS
    // =============================================================================

    #[test]
    #[ignore = "Runtime helpers need implementation"]
    fn test_actor_spawn_helper() {
        let runtime = ActorRuntime::new();
        let actor = runtime.spawn_test_actor("Counter", json!({"value": 0}));

        assert!(actor.is_alive(), "Spawned actor should be alive");
        assert_eq!(actor.actor_type(), "Counter", "Should have correct type");
    }

    #[test]
    #[ignore = "Runtime helpers need implementation"]
    fn test_message_send_helper() {
        let runtime = ActorRuntime::new();
        let actor = runtime.spawn_test_actor("Echo", json!({}));

        let result = actor.send_and_wait("echo", json!("test"));
        assert_eq!(result, json!("test"), "Echo should return input");
    }

    #[test]
    #[ignore = "Runtime helpers need implementation"]
    fn test_supervision_test_helper() {
        let runtime = ActorRuntime::new();
        let supervisor = runtime.create_test_supervisor(SupervisorStrategy::OneForOne);
        let actor = supervisor.spawn_child("Failing", json!({}));

        // Force failure
        let _ = actor.send("fail", json!({}));

        // Should be restarted
        assert!(
            actor.is_alive_after_restart(),
            "Should be restarted after failure"
        );
        assert_eq!(
            supervisor.restart_count(&actor),
            1,
            "Should have restarted once"
        );
    }
}

#[cfg(test)]
mod property_test_infrastructure {
    use super::*;
    use proptest::prelude::*;

    // =============================================================================
    // PROPERTY TEST INFRASTRUCTURE TESTS
    // =============================================================================

    proptest! {
        #[test]
        #[ignore = "Property test infrastructure needs implementation"]
        fn prop_test_actor_input_generation(seed: u64) {
            let input = ActorInput::generate_with_seed(seed);

            prop_assert!(!input.source.is_empty());
            prop_assert!(input.contains_actor_keyword());
            prop_assert!(input.is_syntactically_balanced());  // Braces, parens match
        }

        #[test]
        #[ignore = "Property test infrastructure needs implementation"]
        fn prop_test_message_sequence_properties(
            count in 1..100usize,
            seed in 0..1000u64
        ) {
            let sequence = MessageSequence::generate_with_seed(count, seed);

            prop_assert_eq!(sequence.len(), count);
            prop_assert!(sequence.is_ordered());
            prop_assert!(sequence.all_unique_ids());
        }

        #[test]
        #[ignore = "Property test infrastructure needs implementation"]
        fn prop_test_runtime_operations_never_panic(
            operations in prop::collection::vec(
                prop::sample::select(vec![
                    "spawn",
                    "send",
                    "ask",
                    "stop",
                    "restart"
                ]),
                1..50
            )
        ) {
            let runtime = ActorRuntime::new();

            for op in operations {
                let result = std::panic::catch_unwind(|| {
                    runtime.execute_test_operation(&op);
                });
                prop_assert!(result.is_ok(), "Runtime operations should never panic");
            }
        }
    }
}

// =============================================================================
// HELPER TYPES AND STRUCTS (Test Framework Design)
// =============================================================================

/// Test context providing all actor system testing utilities
#[derive(Debug)]
pub struct ActorTestContext {
    pub parser: Option<Parser>,
    pub typechecker: Option<TypeChecker>,
    pub transpiler: Option<Transpiler>,
    pub runtime: Option<ActorRuntime>,
}

impl ActorTestContext {
    /// Create new test context with all components
    pub fn new() -> Self {
        // This will be implemented after tests drive the design
        unimplemented!("EXTREME TDD: Implementation follows tests")
    }

    /// Assert that parsing fails with specific error
    pub fn assert_parse_error(&self, input: &str, expected: ParseError) {
        unimplemented!("EXTREME TDD: Implementation follows tests")
    }

    /// Assert that type checking fails with specific error
    pub fn assert_type_error(&self, input: &str, expected: TypeError) {
        unimplemented!("EXTREME TDD: Implementation follows tests")
    }

    /// Assert runtime behavior matches expectation
    pub fn assert_runtime_behavior<T>(&self, input: &str, assertion: impl Fn(T)) {
        unimplemented!("EXTREME TDD: Implementation follows tests")
    }

    /// Parse input and return AST
    pub fn parse(&self, input: &str) -> Result<AST, ParseError> {
        unimplemented!("EXTREME TDD: Implementation follows tests")
    }
}

/// Generated actor input for property testing
#[derive(Debug, Clone)]
pub struct ActorInput {
    pub source: String,
    pub expected_type: String,
    pub has_state: bool,
    pub receive_count: usize,
}

impl ActorInput {
    pub fn generate() -> Self {
        unimplemented!("EXTREME TDD: Implementation follows tests")
    }

    pub fn generate_with_seed(seed: u64) -> Self {
        unimplemented!("EXTREME TDD: Implementation follows tests")
    }

    pub fn is_syntactically_valid(&self) -> bool {
        unimplemented!("EXTREME TDD: Implementation follows tests")
    }

    pub fn contains_actor_keyword(&self) -> bool {
        unimplemented!("EXTREME TDD: Implementation follows tests")
    }

    pub fn is_syntactically_balanced(&self) -> bool {
        unimplemented!("EXTREME TDD: Implementation follows tests")
    }
}

/// Message sequence for testing ordering properties
#[derive(Debug, Clone)]
pub struct MessageSequence {
    pub messages: Vec<TestMessage>,
}

impl MessageSequence {
    pub fn generate(count: usize) -> Self {
        unimplemented!("EXTREME TDD: Implementation follows tests")
    }

    pub fn generate_with_seed(count: usize, seed: u64) -> Self {
        unimplemented!("EXTREME TDD: Implementation follows tests")
    }

    pub fn len(&self) -> usize {
        unimplemented!("EXTREME TDD: Implementation follows tests")
    }

    pub fn is_ordered(&self) -> bool {
        unimplemented!("EXTREME TDD: Implementation follows tests")
    }

    pub fn all_valid(&self) -> bool {
        unimplemented!("EXTREME TDD: Implementation follows tests")
    }

    pub fn all_unique_ids(&self) -> bool {
        unimplemented!("EXTREME TDD: Implementation follows tests")
    }
}

#[derive(Debug, Clone)]
pub struct TestMessage {
    pub id: u64,
    pub content: String,
    pub timestamp: u64,
}

/// Error types for actor parsing
#[derive(Debug, PartialEq)]
pub enum ParseError {
    UnexpectedToken { expected: String, found: String },
    NestedActorNotAllowed,
    ReceiveOutsideActor,
    InvalidSyntax(String),
}

/// Error types for actor type checking
#[derive(Debug, PartialEq)]
pub enum TypeError {
    TypeMismatch { expected: String, found: String },
    MessageTypeMismatch { expected: String, found: String },
    ActorRefInvalidType(String),
}

// Forward declarations for AST types (will be implemented later)
#[derive(Debug, PartialEq, Clone)]
pub enum AST {
    Actor(Actor),
    Program(Vec<AST>),
}

#[derive(Debug, PartialEq, Clone)]
pub struct Actor {
    pub name: String,
    pub fields: Vec<Field>,
    pub receives: Vec<Receive>,
    pub hooks: Vec<Hook>,
}

#[derive(Debug, PartialEq, Clone)]
pub struct Field {
    pub name: String,
    pub ty: Type,
}

#[derive(Debug, PartialEq, Clone)]
pub struct Receive {
    pub name: String,
    pub params: Vec<Param>,
    pub return_type: Option<Type>,
    pub body: Block,
}

#[derive(Debug, PartialEq, Clone)]
pub struct Hook {
    pub name: String,
    pub params: Vec<Param>,
    pub body: Block,
}

#[derive(Debug, PartialEq, Clone)]
pub struct Param {
    pub name: String,
    pub ty: Type,
}

#[derive(Debug, PartialEq, Clone)]
pub enum Type {
    I32,
    String,
    Bool,
    ActorRef(Box<Type>),
    Actor(String),
    Option(Box<Type>),
    Result(Box<Type>, Box<Type>),
    Generic(String),
}

#[derive(Debug, PartialEq, Clone)]
pub struct Block(pub Vec<Expr>);

#[derive(Debug, PartialEq, Clone)]
pub enum Expr {
    Literal(Literal),
    Identifier(String),
    Self_,
    FieldAccess {
        object: Box<Expr>,
        field: String,
    },
    Binary {
        left: Box<Expr>,
        op: BinaryOp,
        right: Box<Expr>,
    },
    Assign {
        target: Box<Expr>,
        value: Box<Expr>,
    },
    Call {
        name: String,
        args: Vec<Expr>,
    },
    Send {
        actor: Box<Expr>,
        message: Box<Expr>,
    },
    Ask {
        actor: Box<Expr>,
        message: Box<Expr>,
        timeout: Option<Duration>,
    },
}

#[derive(Debug, PartialEq, Clone)]
pub enum Literal {
    Integer(i32),
    String(String),
    Bool(bool),
}

#[derive(Debug, PartialEq, Clone)]
pub enum BinaryOp {
    Add,
    Sub,
    Mul,
    Div,
    Equal,
    NotEqual,
}

// Helper structs for testing
pub struct ActorRuntime;
pub struct TestActor;
pub struct Supervisor;

#[derive(Debug, Clone)]
pub enum SupervisorStrategy {
    OneForOne,
    AllForOne,
    RestForOne,
}

// Test helper functions (signatures only - implementation follows tests)
pub fn compile_and_run(program: &str) -> Value {
    unimplemented!("EXTREME TDD: Implementation follows tests")
}

pub fn compile_and_load(program: &str) -> ActorRuntime {
    unimplemented!("EXTREME TDD: Implementation follows tests")
}

pub fn test_simple_actor_exists() -> bool {
    unimplemented!("EXTREME TDD: Implementation follows tests")
}

#[derive(Debug, PartialEq)]
pub enum Value {
    Integer(i32),
    String(String),
    Bool(bool),
}

// Macro placeholders (will be implemented to generate actual tests)
macro_rules! parser_test {
    ($name:ident, $input:expr, $expected:expr) => {
        // This macro will generate a test function
        // Implementation follows after tests define requirements
    };
}

macro_rules! property_test {
    ($name:ident, $property:expr) => {
        // This macro will generate a property test
        // Implementation follows after tests define requirements
    };
}

macro_rules! assert_contains {
    ($haystack:expr, $needle:expr) => {
        // Assertion macro for string contents
        // Implementation follows after tests define requirements
    };
}

macro_rules! assert_duration_under {
    ($operation:expr, $duration:expr) => {
        // Timing assertion macro
        // Implementation follows after tests define requirements
    };
}

macro_rules! assert_memory_under {
    ($operation:expr, $bytes:expr) => {
        // Memory usage assertion macro
        // Implementation follows after tests define requirements
    };
}

// External dependencies that will be needed (serde_json for test data)
use serde_json::{json, Value as JsonValue};

/// Helper to use json! macro for test data
pub fn json(value: impl Into<JsonValue>) -> JsonValue {
    value.into()
}
