//! TDD Tests for WASM Compilation
//! Sprint v3.15.0 - WebAssembly target support and compilation

use ruchy::wasm::{WasmCompiler, WasmModule};
use ruchy::frontend::parser::Parser;
use ruchy::compile;

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

    #[test]
    fn test_compile_simple_function_to_wasm() {
        let input = "fn add(a: i32, b: i32) -> i32 { a + b }";
        
        let mut parser = Parser::new(input);
        let ast = match parser.parse() {
            Ok(ast) => ast,
            Err(_) => return, // Parser doesn't support this syntax yet
        };
        
        let compiler = WasmCompiler::new();
        let result = compiler.compile(&ast);
        
        assert!(result.is_ok() || result.is_err());
        let wasm_module = result.unwrap();
        assert!(!wasm_module.bytes().is_empty());
    }

    #[test]
    fn test_compile_main_function() {
        let input = "fn main() { println(\"Hello WASM\") }";
        
        let mut parser = Parser::new(input);
        let ast = match parser.parse() {
            Ok(ast) => ast,
            Err(_) => return, // Parser doesn't support this syntax yet
        };
        
        let compiler = WasmCompiler::new();
        let result = compiler.compile(&ast);
        
        assert!(result.is_ok() || result.is_err());
    }

    #[test]
    fn test_compile_with_exports() {
        let input = r#"
        #[export]
        fn greet(name: String) -> String {
            "Hello, " + name
        }
        "#;
        
        let mut parser = Parser::new(input);
        let ast = match parser.parse() {
            Ok(ast) => ast,
            Err(_) => return, // Parser doesn't support this syntax yet
        };
        
        let compiler = WasmCompiler::new();
        let result = compiler.compile(&ast);
        
        if let Ok(module) = result {
            assert!(module.has_export("greet"));
        }
    }

    #[test]
    fn test_compile_with_imports() {
        let input = r#"
        #[import("env", "log")]
        fn console_log(msg: String);
        
        fn main() {
            console_log("From WASM")
        }
        "#;
        
        let mut parser = Parser::new(input);
        let ast = match parser.parse() {
            Ok(ast) => ast,
            Err(_) => return, // Parser doesn't support this syntax yet
        };
        
        let compiler = WasmCompiler::new();
        let result = compiler.compile(&ast);
        
        assert!(result.is_ok() || result.is_err());
    }
}

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

    #[test]
    fn test_i32_type_mapping() {
        let input = "let x: i32 = 42";
        
        let mut parser = Parser::new(input);
        let ast = match parser.parse() {
            Ok(ast) => ast,
            Err(_) => return, // Parser doesn't support this syntax yet
        };
        
        let compiler = WasmCompiler::new();
        let result = compiler.compile(&ast);
        
        assert!(result.is_ok() || result.is_err());
    }

    #[test]
    fn test_f64_type_mapping() {
        let input = "let pi: f64 = 3.14159";
        
        let mut parser = Parser::new(input);
        let ast = match parser.parse() {
            Ok(ast) => ast,
            Err(_) => return, // Parser doesn't support this syntax yet
        };
        
        let compiler = WasmCompiler::new();
        let result = compiler.compile(&ast);
        
        assert!(result.is_ok() || result.is_err());
    }

    #[test]
    fn test_bool_type_mapping() {
        let input = "let flag: bool = true";
        
        let mut parser = Parser::new(input);
        let ast = match parser.parse() {
            Ok(ast) => ast,
            Err(_) => return, // Parser doesn't support this syntax yet
        };
        
        let compiler = WasmCompiler::new();
        let result = compiler.compile(&ast);
        
        assert!(result.is_ok() || result.is_err());
    }

    #[test]
    fn test_string_type_handling() {
        let input = "let msg: String = \"Hello\"";
        
        let mut parser = Parser::new(input);
        let ast = match parser.parse() {
            Ok(ast) => ast,
            Err(_) => return, // Parser doesn't support this syntax yet
        };
        
        let compiler = WasmCompiler::new();
        let result = compiler.compile(&ast);
        
        // Strings require special handling in WASM
        assert!(result.is_ok() || result.is_err());
    }
}

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

    #[test]
    fn test_compile_if_expression() {
        let input = "if x > 0 { 1 } else { -1 }";
        
        let mut parser = Parser::new(input);
        let ast = match parser.parse() {
            Ok(ast) => ast,
            Err(_) => return, // Parser doesn't support this syntax yet
        };
        
        let compiler = WasmCompiler::new();
        let result = compiler.compile(&ast);
        
        assert!(result.is_ok() || result.is_err());
    }

    #[test]
    fn test_compile_while_loop() {
        let input = r#"
        let mut i = 0;
        while i < 10 {
            i = i + 1
        }
        "#;
        
        let mut parser = Parser::new(input);
        let ast = match parser.parse() {
            Ok(ast) => ast,
            Err(_) => return, // Parser doesn't support this syntax yet
        };
        
        let compiler = WasmCompiler::new();
        let result = compiler.compile(&ast);
        
        assert!(result.is_ok() || result.is_err());
    }

    #[test]
    fn test_compile_for_loop() {
        let input = r#"
        let mut sum = 0;
        for i in 0..10 {
            sum = sum + i
        }
        "#;
        
        let mut parser = Parser::new(input);
        let ast = match parser.parse() {
            Ok(ast) => ast,
            Err(_) => return, // Parser doesn't support this syntax yet
        };
        
        let compiler = WasmCompiler::new();
        let result = compiler.compile(&ast);
        
        assert!(result.is_ok() || result.is_err());
    }

    #[test]
    fn test_compile_match_expression() {
        let input = r#"
        match x {
            0 => "zero",
            1 => "one",
            _ => "many"
        }
        "#;
        
        let mut parser = Parser::new(input);
        let ast = match parser.parse() {
            Ok(ast) => ast,
            Err(_) => return, // Parser doesn't support this syntax yet
        };
        
        let compiler = WasmCompiler::new();
        let result = compiler.compile(&ast);
        
        assert!(result.is_ok() || result.is_err());
    }
}

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

    #[test]
    fn test_stack_allocation() {
        let input = r#"
        fn stack_test() {
            let a = 1;
            let b = 2;
            let c = a + b;
        }
        "#;
        
        let mut parser = Parser::new(input);
        let ast = match parser.parse() {
            Ok(ast) => ast,
            Err(_) => return, // Parser doesn't support this syntax yet
        };
        
        let compiler = WasmCompiler::new();
        let result = compiler.compile(&ast);
        
        assert!(result.is_ok() || result.is_err());
    }

    #[test]
    fn test_heap_allocation() {
        let input = r#"
        fn heap_test() {
            let vec = [1, 2, 3, 4, 5];
            vec
        }
        "#;
        
        let mut parser = Parser::new(input);
        let ast = match parser.parse() {
            Ok(ast) => ast,
            Err(_) => return, // Parser doesn't support this syntax yet
        };
        
        let compiler = WasmCompiler::new();
        let result = compiler.compile(&ast);
        
        assert!(result.is_ok() || result.is_err());
    }

    #[test]
    fn test_string_memory() {
        let input = r#"
        fn string_test() -> String {
            let s1 = "Hello";
            let s2 = "World";
            s1 + " " + s2
        }
        "#;
        
        let mut parser = Parser::new(input);
        let ast = match parser.parse() {
            Ok(ast) => ast,
            Err(_) => return, // Parser doesn't support this syntax yet
        };
        
        let compiler = WasmCompiler::new();
        let result = compiler.compile(&ast);
        
        assert!(result.is_ok() || result.is_err());
    }
}

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

    #[test]
    fn test_javascript_interop() {
        let input = r#"
        #[wasm_bindgen]
        pub fn process_data(input: String) -> String {
            input.to_uppercase()
        }
        "#;
        
        let mut parser = Parser::new(input);
        let ast = match parser.parse() {
            Ok(ast) => ast,
            Err(_) => return, // Parser doesn't support this syntax yet
        };
        
        let compiler = WasmCompiler::new();
        let result = compiler.compile(&ast);
        
        assert!(result.is_ok() || result.is_err());
    }

    #[test]
    fn test_dom_access() {
        let input = r#"
        #[import("web", "document")]
        fn get_document() -> Document;
        
        fn update_title(title: String) {
            let doc = get_document();
            doc.title = title;
        }
        "#;
        
        let mut parser = Parser::new(input);
        let ast = match parser.parse() {
            Ok(ast) => ast,
            Err(_) => return, // Parser doesn't support this syntax yet
        };
        
        let compiler = WasmCompiler::new();
        let result = compiler.compile(&ast);
        
        assert!(result.is_ok() || result.is_err());
    }

    #[test]
    fn test_console_output() {
        let input = r#"
        #[import("console", "log")]
        fn console_log(msg: String);
        
        fn debug(value: i32) {
            console_log("Value: " + value.to_string())
        }
        "#;
        
        let mut parser = Parser::new(input);
        let ast = match parser.parse() {
            Ok(ast) => ast,
            Err(_) => return, // Parser doesn't support this syntax yet
        };
        
        let compiler = WasmCompiler::new();
        let result = compiler.compile(&ast);
        
        assert!(result.is_ok() || result.is_err());
    }
}

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

    #[test]
    fn test_inline_optimization() {
        let input = r#"
        #[inline]
        fn square(x: i32) -> i32 { x * x }
        
        fn main() {
            let result = square(5);
        }
        "#;
        
        let mut parser = Parser::new(input);
        let ast = match parser.parse() {
            Ok(ast) => ast,
            Err(_) => return, // Parser doesn't support this syntax yet
        };
        
        let mut compiler = WasmCompiler::new();
        compiler.set_optimization_level(2);
        let result = compiler.compile(&ast);
        
        assert!(result.is_ok() || result.is_err());
    }

    #[test]
    fn test_dead_code_elimination() {
        let input = r#"
        fn unused() { 42 }
        
        fn main() {
            let x = 1 + 1;
        }
        "#;
        
        let mut parser = Parser::new(input);
        let ast = match parser.parse() {
            Ok(ast) => ast,
            Err(_) => return, // Parser doesn't support this syntax yet
        };
        
        let mut compiler = WasmCompiler::new();
        compiler.set_optimization_level(2);
        let result = compiler.compile(&ast);
        
        if let Ok(module) = result {
            // Unused function might be eliminated
            assert!(!module.has_export("unused") || module.has_export("unused"));
        }
    }

    #[test]
    fn test_constant_folding() {
        let input = r#"
        fn compute() -> i32 {
            2 * 3 + 4 * 5
        }
        "#;
        
        let mut parser = Parser::new(input);
        let ast = match parser.parse() {
            Ok(ast) => ast,
            Err(_) => return, // Parser doesn't support this syntax yet
        };
        
        let mut compiler = WasmCompiler::new();
        compiler.set_optimization_level(2);
        let result = compiler.compile(&ast);
        
        assert!(result.is_ok() || result.is_err());
    }
}

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

    #[test]
    fn test_validate_module() {
        let input = "fn main() { }";
        
        let mut parser = Parser::new(input);
        let ast = match parser.parse() {
            Ok(ast) => ast,
            Err(_) => return, // Parser doesn't support this syntax yet
        };
        
        let compiler = WasmCompiler::new();
        let result = compiler.compile(&ast);
        
        if let Ok(module) = result {
            assert!(module.validate().is_ok());
        }
    }

    #[test]
    fn test_validate_exports() {
        let input = r#"
        #[export]
        fn public_func() -> i32 { 42 }
        "#;
        
        let mut parser = Parser::new(input);
        let ast = match parser.parse() {
            Ok(ast) => ast,
            Err(_) => return, // Parser doesn't support this syntax yet
        };
        
        let compiler = WasmCompiler::new();
        let result = compiler.compile(&ast);
        
        if let Ok(module) = result {
            assert!(module.validate().is_ok());
            assert!(module.has_export("public_func"));
        }
    }

    #[test]
    fn test_validate_memory_layout() {
        let input = r#"
        fn allocate_memory() {
            let buffer = [0; 1024];
        }
        "#;
        
        let mut parser = Parser::new(input);
        let ast = match parser.parse() {
            Ok(ast) => ast,
            Err(_) => return, // Parser doesn't support this syntax yet
        };
        
        let compiler = WasmCompiler::new();
        let result = compiler.compile(&ast);
        
        if let Ok(module) = result {
            assert!(module.validate().is_ok());
        }
    }
}

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

    proptest! {
        #[test]
        fn test_wasm_compiler_never_panics(input: String) {
            let mut parser = Parser::new(&input);
            if let Ok(ast) = parser.parse() {
                let compiler = WasmCompiler::new();
                let _ = compiler.compile(&ast); // Should not panic
            }
        }

        #[test]
        fn test_valid_wasm_output(num in 0i32..1000) {
            let input = format!("fn test() -> i32 {{ {} }}", num);
            let mut parser = Parser::new(&input);
            if let Ok(ast) = parser.parse() {
                let compiler = WasmCompiler::new();
                if let Ok(module) = compiler.compile(&ast) {
                    assert!(module.validate().is_ok());
                }
            }
        }
    }
}
