use qr_core::qr::{QrCode, QrConfig, VersionMode};
use qr_core::version::EcLevel;

#[test]
fn test_encode_simple_text() {
    let config = QrConfig::default();
    let qr = QrCode::encode("HELLO WORLD", config).unwrap();
    assert_eq!(qr.version.0, 1);
    assert_eq!(qr.size(), 21);
}

#[test]
fn test_all_levels() {
    for level in [EcLevel::L, EcLevel::M, EcLevel::Q, EcLevel::H] {
        let config = QrConfig {
            level,
            ..Default::default()
        };
        let qr = QrCode::encode("TEST", config).unwrap();
        assert!(qr.size() >= 21);
        assert!(qr.size() <= 177);
    }
}

#[test]
fn test_chinese_text() {
    let config = QrConfig::default();
    let qr = QrCode::encode("你好世界", config).unwrap();
    assert!(qr.size() >= 21);
}

#[test]
fn test_url_encoding() {
    let config = QrConfig::default();
    let qr = QrCode::encode("https://example.com/path?q=1", config).unwrap();
    assert!(qr.size() >= 21);
}

#[test]
fn test_numeric_only_small_version() {
    let mut config = QrConfig::default();
    config.version = VersionMode::Fixed(1);
    let qr = QrCode::encode("12345678901234567890", config).unwrap();
    assert_eq!(qr.version.0, 1);
}

#[test]
fn test_fixed_version() {
    let config = QrConfig {
        version: VersionMode::Fixed(5),
        ..Default::default()
    };
    let qr = QrCode::encode("FIXED VERSION TEST", config).unwrap();
    assert_eq!(qr.version.0, 5);
}

#[test]
fn test_empty_input_fails() {
    let config = QrConfig::default();
    let result = QrCode::encode("", config);
    assert!(result.is_err());
}

#[test]
fn test_svg_output() {
    let qr = QrCode::encode("TEST", QrConfig::default()).unwrap();
    let svg = qr.to_svg();
    assert!(svg.contains("<svg"));
    assert!(svg.contains("</svg>"));
    assert!(svg.contains("fill=\"black\""));
}

#[test]
fn test_ascii_output() {
    let qr = QrCode::encode("TEST", QrConfig::default()).unwrap();
    let ascii = qr.to_ascii(false);
    assert!(!ascii.is_empty());
    assert!(ascii.contains('\n'));
    // 应该有暗模块
    assert!(ascii.contains("██"));
}

#[test]
fn test_png_output() {
    let qr = QrCode::encode("TEST", QrConfig::default()).unwrap();
    let png = qr.to_png_bytes(4);
    assert!(!png.is_empty());
    // PNG 文件应以 8 字节魔术签名开头
    assert_eq!(&png[..8], &[137, 80, 78, 71, 13, 10, 26, 10]);
}

#[test]
fn test_modules_matrix() {
    let qr = QrCode::encode("QR", QrConfig::default()).unwrap();
    let modules = qr.modules();
    assert_eq!(modules.len(), qr.size() as usize);
    assert_eq!(modules[0].len(), qr.size() as usize);
    // 至少有一些暗模块
    let has_dark = modules.iter().any(|row| row.iter().any(|&m| m));
    assert!(has_dark, "QR 码应该包含暗模块");
}

#[test]
fn test_margin_is_included_in_dimensions() {
    let mut config = QrConfig::default();
    config.margin = 2;
    let qr = QrCode::encode("MARGIN TEST", config).unwrap();

    // SVG 的总宽度应该包含 margin
    let svg = qr.to_svg();
    let matrix_size = qr.size() as u32;
    let expected_total = matrix_size + 2 * 2u32;
    assert!(svg.contains(&format!("width=\"{}\"", expected_total)));

    // ASCII 输出行应该包含 margin 列
    let ascii = qr.to_ascii(false);
    let first_line = ascii.lines().next().unwrap();
    let chars_per_module = 2; // ██ 是两个字符
    assert_eq!(
        first_line.chars().count(),
        expected_total as usize * chars_per_module
    );
}

#[test]
fn test_long_text_auto_version() {
    // 长文本应该自动选择更高的版本
    let long_text = "A".repeat(200);
    let qr = QrCode::encode(&long_text, QrConfig::default()).unwrap();
    // 至少要 Version 2 以上
    assert!(qr.version.0 >= 2);
}

#[test]
fn test_special_chars() {
    let config = QrConfig::default();
    let qr = QrCode::encode("$%*+-./: SPACE", config).unwrap();
    assert!(qr.size() >= 21);
}

#[test]
fn test_numeric_mode_efficiency() {
    // 纯数字在 Version 1 L 级最多 41 位（约 7089 位数字）
    let digits = "1".repeat(20);
    let mut config = QrConfig::default();
    config.version = VersionMode::Fixed(1);
    config.level = EcLevel::L;
    let qr = QrCode::encode(&digits, config).unwrap();
    assert_eq!(qr.version.0, 1);
}