use std::fs;

use archlens_domain::{AnalysisConfig, Language, ports::FileDiscovery};
use archlens_walkdir::WalkdirDiscovery;

fn create_test_tree(dir: &std::path::Path) {
    fs::create_dir_all(dir.join("src/orders")).unwrap();
    fs::create_dir_all(dir.join("src/billing")).unwrap();
    fs::write(dir.join("src/orders/service.rs"), "struct OrderService;").unwrap();
    fs::write(dir.join("src/orders/model.py"), "class Order: pass").unwrap();
    fs::write(dir.join("src/billing/invoice.cs"), "class Invoice {}").unwrap();
    fs::write(dir.join("src/readme.txt"), "not source code").unwrap();
}

#[test]
fn discovers_rust_python_and_csharp_files() {
    let dir = tempfile::tempdir().unwrap();
    create_test_tree(dir.path());

    let discovery = WalkdirDiscovery::new();
    let files = discovery
        .discover(dir.path(), &AnalysisConfig::default())
        .unwrap();

    assert_eq!(files.len(), 3);

    let languages: Vec<Language> = files.iter().map(|f| f.language()).collect();
    assert!(languages.contains(&Language::Rust));
    assert!(languages.contains(&Language::Python));
    assert!(languages.contains(&Language::CSharp));
}

#[test]
fn ignores_non_source_files() {
    let dir = tempfile::tempdir().unwrap();
    create_test_tree(dir.path());

    let discovery = WalkdirDiscovery::new();
    let files = discovery
        .discover(dir.path(), &AnalysisConfig::default())
        .unwrap();

    let paths: Vec<&str> = files.iter().map(|f| f.path().as_str()).collect();
    assert!(!paths.iter().any(|p| p.ends_with(".txt")));
}

#[test]
fn respects_exclude_patterns() {
    let dir = tempfile::tempdir().unwrap();
    create_test_tree(dir.path());

    let config = AnalysisConfig::default().with_excludes(vec!["billing".to_string()]);

    let discovery = WalkdirDiscovery::new();
    let files = discovery.discover(dir.path(), &config).unwrap();

    assert_eq!(files.len(), 2);
    assert!(!files.iter().any(|f| f.path().as_str().contains("billing")));
}

#[test]
fn excludes_python_test_prefix_files_by_default() {
    let dir = tempfile::tempdir().unwrap();
    fs::write(dir.path().join("orders.py"), "class Order: pass").unwrap();
    fs::write(dir.path().join("test_orders.py"), "class TestOrder: pass").unwrap();

    let discovery = WalkdirDiscovery::new();
    let files = discovery
        .discover(dir.path(), &AnalysisConfig::default())
        .unwrap();

    assert_eq!(files.len(), 1);
    assert!(files[0].path().as_str().ends_with("orders.py"));
}

#[test]
fn excludes_python_test_suffix_files_by_default() {
    let dir = tempfile::tempdir().unwrap();
    fs::write(dir.path().join("orders.py"), "class Order: pass").unwrap();
    fs::write(dir.path().join("orders_test.py"), "class OrderTest: pass").unwrap();

    let discovery = WalkdirDiscovery::new();
    let files = discovery
        .discover(dir.path(), &AnalysisConfig::default())
        .unwrap();

    assert_eq!(files.len(), 1);
    assert!(files[0].path().as_str().ends_with("orders.py"));
}

#[test]
fn excludes_files_in_tests_directory_by_default() {
    let dir = tempfile::tempdir().unwrap();
    fs::create_dir_all(dir.path().join("tests")).unwrap();
    fs::write(dir.path().join("orders.py"), "class Order: pass").unwrap();
    fs::write(dir.path().join("tests/helpers.py"), "class Helper: pass").unwrap();

    let discovery = WalkdirDiscovery::new();
    let files = discovery
        .discover(dir.path(), &AnalysisConfig::default())
        .unwrap();

    assert_eq!(files.len(), 1);
    assert!(files[0].path().as_str().ends_with("orders.py"));
}

#[test]
fn excludes_rust_test_files_by_default() {
    let dir = tempfile::tempdir().unwrap();
    fs::write(dir.path().join("orders.rs"), "struct Order;").unwrap();
    fs::write(dir.path().join("orders_tests.rs"), "struct OrdersTests;").unwrap();

    let discovery = WalkdirDiscovery::new();
    let files = discovery
        .discover(dir.path(), &AnalysisConfig::default())
        .unwrap();

    assert_eq!(files.len(), 1);
    assert!(files[0].path().as_str().ends_with("orders.rs"));
}

#[test]
fn excludes_rust_files_in_tests_directory_by_default() {
    let dir = tempfile::tempdir().unwrap();
    fs::create_dir_all(dir.path().join("tests")).unwrap();
    fs::write(dir.path().join("lib.rs"), "struct Lib;").unwrap();
    fs::write(
        dir.path().join("tests/integration.rs"),
        "struct IntegrationTest;",
    )
    .unwrap();

    let discovery = WalkdirDiscovery::new();
    let files = discovery
        .discover(dir.path(), &AnalysisConfig::default())
        .unwrap();

    assert_eq!(files.len(), 1);
    assert!(files[0].path().as_str().ends_with("lib.rs"));
}

#[test]
fn include_tests_flag_re_enables_test_files() {
    let dir = tempfile::tempdir().unwrap();
    fs::write(dir.path().join("orders.py"), "class Order: pass").unwrap();
    fs::write(dir.path().join("test_orders.py"), "class TestOrder: pass").unwrap();

    let config = AnalysisConfig::default().with_include_tests(true);
    let discovery = WalkdirDiscovery::new();
    let files = discovery.discover(dir.path(), &config).unwrap();

    assert_eq!(files.len(), 2);
}

#[test]
fn empty_directory_returns_no_files() {
    let dir = tempfile::tempdir().unwrap();

    let discovery = WalkdirDiscovery::new();
    let files = discovery
        .discover(dir.path(), &AnalysisConfig::default())
        .unwrap();

    assert!(files.is_empty());
}