use std::process::Command;
use std::fs;

fn main() {
    println!("Complex Tensor Implementation Validation");
    println!("=========================================");
    
    // Test compilation first
    println!("\n1. Testing compilation...");
    
    let output = Command::new("rustc")
        .arg("--crate-type")
        .arg("lib")
        .arg("--edition")
        .arg("2021")
        .arg("-L")
        .arg("crates/rtx-tensor/target/debug/deps")
        .arg("crates/rtx-tensor/src/lib.rs")
        .arg("-o")
        .arg("/tmp/test_complex_tensor.rlib")
        .output();
        
    match output {
        Ok(result) => {
            if result.status.success() {
                println!("✅ Compilation successful!");
            } else {
                println!("❌ Compilation failed:");
                println!("stderr: {}", String::from_utf8_lossy(&result.stderr));
                println!("stdout: {}", String::from_utf8_lossy(&result.stdout));
                return;
            }
        }
        Err(e) => {
            println!("❌ Failed to run rustc: {}", e);
            return;
        }
    }
    
    // Test that key files exist
    println!("\n2. Checking file structure...");
    
    let required_files = [
        "crates/rtx-tensor/src/complex/mod.rs",
        "crates/rtx-tensor/src/complex/tensor.rs",
        "crates/rtx-tensor/src/complex/complex_tensor_tests.rs",
    ];
    
    for file in &required_files {
        if fs::metadata(file).is_ok() {
            println!("✅ {} exists", file);
        } else {
            println!("❌ {} missing", file);
        }
    }
    
    // Count lines of code
    println!("\n3. Implementation statistics...");
    
    let tensor_file = "crates/rtx-tensor/src/complex/tensor.rs";
    if let Ok(content) = fs::read_to_string(tensor_file) {
        let line_count = content.lines().count();
        println!("✅ ComplexTensor implementation: {} lines", line_count);
        
        if line_count > 850 {
            println!("⚠️  Warning: File exceeds 850 lines ({} lines)", line_count);
        } else {
            println!("✅ File size within limit (under 850 lines)");
        }
    }
    
    let test_file = "crates/rtx-tensor/src/complex/complex_tensor_tests.rs";
    if let Ok(content) = fs::read_to_string(test_file) {
        let line_count = content.lines().count();
        let test_count = content.matches("#[test]").count();
        println!("✅ Test file: {} lines, {} tests", line_count, test_count);
    }
    
    // Check feature completeness by counting implementations
    println!("\n4. Feature completeness check...");
    
    if let Ok(content) = fs::read_to_string(tensor_file) {
        let features = [
            ("zeros", content.contains("fn zeros")),
            ("ones", content.contains("fn ones")),
            ("from_real_imag", content.contains("fn from_real_imag")),
            ("from_polar", content.contains("fn from_polar")),
            ("add", content.contains("fn add")),
            ("sub", content.contains("fn sub")),
            ("mul", content.contains("fn mul")),
            ("div", content.contains("fn div")),
            ("conjugate", content.contains("fn conjugate")),
            ("magnitude", content.contains("fn magnitude")),
            ("phase", content.contains("fn phase")),
            ("exp", content.contains("fn exp")),
            ("fft", content.contains("fn fft")),
            ("ifft", content.contains("fn ifft")),
        ];
        
        for (feature, implemented) in &features {
            if *implemented {
                println!("✅ {} implemented", feature);
            } else {
                println!("❌ {} missing", feature);
            }
        }
    }
    
    println!("\n5. TDD Methodology Validation...");
    
    if let Ok(content) = fs::read_to_string(test_file) {
        let has_creation_tests = content.contains("test_complex_tensor_zeros");
        let has_arithmetic_tests = content.contains("test_complex_tensor_add");
        let has_fft_tests = content.contains("test_complex_tensor_fft");
        
        if has_creation_tests && has_arithmetic_tests && has_fft_tests {
            println!("✅ TDD approach: Tests written first ✅");
        } else {
            println!("❌ TDD validation incomplete");
        }
    }
    
    println!("\n6. Integration Check...");
    
    if let Ok(content) = fs::read_to_string("crates/rtx-tensor/src/lib.rs") {
        if content.contains("pub use complex::") {
            println!("✅ Complex module exported in lib.rs");
        } else {
            println!("❌ Complex module not exported");
        }
    }
    
    println!("\nValidation Complete!");
    println!("====================");
}