use hcie_protocol::tools::{TextAlignment, TextOrientation, TextEffect};
use hcie_text::TextRenderer;

/// Integration tests for hcie-text text rendering.
///
/// Covers: font loading, font management, rasterization baseline,
/// error handling for missing fonts, fallback behavior,
/// create_text_layer and refresh_text_layer.

// ---------------------------------------------------------------------------
// Helper: load a built-in font for testing
// ---------------------------------------------------------------------------
fn setup_renderer() -> (TextRenderer, bool) {
    let mut renderer = TextRenderer::new();
    let font_data = include_bytes!("../tests/fixtures/Inter-Regular.ttf");
    let ok = renderer.load_font("Inter", font_data).is_ok();
    (renderer, ok)
}

// ---------------------------------------------------------------------------
// Font management
// ---------------------------------------------------------------------------

#[test]
fn new_renderer_has_no_fonts() {
    let renderer = TextRenderer::new();
    assert!(renderer.get_fonts().is_empty(), "new renderer should have no fonts");
}

#[test]
fn load_font_succeeds_with_valid_data() {
    let mut renderer = TextRenderer::new();
    // embed a small TTF for testing — must exist at this path
    let font_data = include_bytes!("../tests/fixtures/Inter-Regular.ttf");
    let result = renderer.load_font("Inter", font_data);
    assert!(result.is_ok(), "loading a valid TTF should succeed: {:?}", result.err());
}

#[test]
fn load_font_fails_with_invalid_data() {
    let mut renderer = TextRenderer::new();
    let result = renderer.load_font("Invalid", &[0u8, 1, 2, 3]);
    assert!(result.is_err(), "loading garbage data as a font should fail");
}

#[test]
fn has_font_returns_true_after_loading() {
    let mut renderer = TextRenderer::new();
    let font_data = include_bytes!("../tests/fixtures/Inter-Regular.ttf");
    if renderer.load_font("Inter", font_data).is_ok() {
        assert!(renderer.has_font("Inter"));
    }
}

#[test]
fn has_font_returns_false_for_unloaded() {
    let renderer = TextRenderer::new();
    assert!(!renderer.has_font("NonexistentFont"));
}

#[test]
fn get_fonts_returns_loaded_names() {
    let mut renderer = TextRenderer::new();
    let font_data = include_bytes!("../tests/fixtures/Inter-Regular.ttf");
    if renderer.load_font("MyFont", font_data).is_ok() {
        let fonts = renderer.get_fonts();
        assert!(fonts.contains(&"MyFont".to_string()));
    }
}

// ---------------------------------------------------------------------------
// Text rasterization (baseline — if font is available)
// ---------------------------------------------------------------------------

#[test]
fn rasterize_text_returns_valid_output() {
    let (mut renderer, font_ok) = setup_renderer();
    if !font_ok {
        eprintln!("Skipping: test font not available");
        return;
    }

    let result = renderer.rasterize_text(
        "Hello",
        "Inter",
        24.0,
        [0, 0, 0, 255],    // black
        0.0, 0.0,           // x, y
        0.0,                // angle
        TextAlignment::Left,
        TextOrientation::Horizontal,
        &[],                // no effects
        true,               // anti-alias
    );

    assert!(result.is_ok(), "rasterize should succeed: {:?}", result.err());

    let (pixels, w, h, _ox, _oy, _uw, _uh) = result.unwrap();
    assert!(w > 0, "rasterized width should be > 0");
    assert!(h > 0, "rasterized height should be > 0");
    assert_eq!(pixels.len(), (w * h * 4) as usize);
}

#[test]
fn rasterize_empty_string_produces_no_pixels_or_minimal() {
    let (mut renderer, font_ok) = setup_renderer();
    if !font_ok { return; }

    let result = renderer.rasterize_text(
        "", "Inter", 24.0, [0, 0, 0, 255],
        0.0, 0.0, 0.0, TextAlignment::Left,
        TextOrientation::Horizontal, &[], true,
    );

    // Empty string may return an error or a 0-size buffer; either is acceptable
    match result {
        Ok((pixels, w, h, _, _, _, _)) => {
            assert!(w == 0 || h == 0 || pixels.is_empty(),
                    "empty string should produce trivial output: {}x{}", w, h);
        }
        Err(_) => { /* empty string may legitimately fail */ }
    }
}

#[test]
fn rasterize_returns_different_output_for_different_sizes() {
    let (mut renderer, font_ok) = setup_renderer();
    if !font_ok { return; }

    let small = renderer.rasterize_text(
        "A", "Inter", 12.0, [0, 0, 0, 255],
        0.0, 0.0, 0.0, TextAlignment::Left,
        TextOrientation::Horizontal, &[], true,
    ).unwrap();
    let large = renderer.rasterize_text(
        "A", "Inter", 48.0, [0, 0, 0, 255],
        0.0, 0.0, 0.0, TextAlignment::Left,
        TextOrientation::Horizontal, &[], true,
    ).unwrap();

    // Larger font size should produce taller output
    assert!(large.2 >= small.2, "larger font should produce taller output");
}

// ---------------------------------------------------------------------------
// Color handling
// ---------------------------------------------------------------------------

#[test]
fn rasterize_text_applies_color() {
    let (mut renderer, font_ok) = setup_renderer();
    if !font_ok { return; }

    let result = renderer.rasterize_text(
        "X", "Inter", 24.0, [255, 0, 0, 255],  // red
        0.0, 0.0, 0.0, TextAlignment::Left,
        TextOrientation::Horizontal, &[], true,
    );

    if let Ok((pixels, w, h, _, _, _, _)) = result {
        if w > 0 && h > 0 {
            // At least some pixels should have non-zero red channel
            let has_red = pixels.iter().step_by(4).any(|&r| r > 0);
            assert!(has_red, "text rasterized in red should have non-zero R channel");
        }
    }
}

// ---------------------------------------------------------------------------
// create_text_layer
// ---------------------------------------------------------------------------

#[test]
fn create_text_layer_produces_valid_layer() {
    let (mut renderer, font_ok) = setup_renderer();
    if !font_ok { return; }

    let result = renderer.create_text_layer(
        "Hello", "Inter", 24.0, [0, 0, 0, 255],
        10.0, 20.0, 0.0, TextAlignment::Left,
        TextOrientation::Horizontal, &[],
    );

    assert!(result.is_ok(), "create_text_layer should succeed: {:?}", result.err());
    let layer = result.unwrap();
    assert!(layer.width > 0);
    assert!(layer.height > 0);
    assert!(layer.pixels.len() >= 4);
}

#[test]
fn create_text_layer_fails_for_missing_font() {
    let mut renderer = TextRenderer::new();
    let result = renderer.create_text_layer(
        "Hello", "NonExistentFont", 24.0, [0, 0, 0, 255],
        0.0, 0.0, 0.0, TextAlignment::Left,
        TextOrientation::Horizontal, &[],
    );
    assert!(result.is_err(), "should fail when font is not loaded");
}

// ---------------------------------------------------------------------------
// Error handling
// ---------------------------------------------------------------------------

#[test]
fn rasterize_fails_for_missing_font() {
    let mut renderer = TextRenderer::new();
    let result = renderer.rasterize_text(
        "Hi", "AbsentFont", 12.0, [0; 4],
        0.0, 0.0, 0.0, TextAlignment::Left,
        TextOrientation::Horizontal, &[], true,
    );
    assert!(result.is_err(), "rasterize with missing font should fail");
}

// ---------------------------------------------------------------------------
// refresh_text_layer
// ---------------------------------------------------------------------------

#[test]
fn refresh_text_layer_does_not_panic() {
    let (mut renderer, font_ok) = setup_renderer();
    if !font_ok { return; }

    let mut layer = match renderer.create_text_layer(
        "Test", "Inter", 16.0, [0, 0, 0, 255],
        0.0, 0.0, 0.0, TextAlignment::Left,
        TextOrientation::Horizontal, &[],
    ) {
        Ok(l) => l,
        Err(e) => {
            eprintln!("Skipping refresh test: cannot create layer: {}", e);
            return;
        }
    };

    let result = renderer.refresh_text_layer(&mut layer);
    assert!(result.is_ok() || result.is_err());
    // Either outcome is valid depending on the layer's state
}