// vtest build: !docker-ubuntu-musl // needs GL/gl.h
import os
import gg

const vroot = @VEXEROOT
const background_path = os.join_path(vroot, 'examples/flappylearning/assets/img/background.png')

fn test_get_cached_image_idx_bounds_checking() {
    mut ctx := gg.new_context(width: 100)
    assert ctx.get_cached_image_by_idx(-1).ok == false
    assert ctx.get_cached_image_by_idx(1).ok == false
}

fn test_remove_cached_image_remove_and_get() {
    mut ctx := gg.new_context(width: 100)
    image := gg.Image{
        ok: true
    }
    idx := ctx.cache_image(image)
    assert ctx.get_cached_image_by_idx(idx).ok == true
    ctx.remove_cached_image_by_idx(idx)
    assert ctx.get_cached_image_by_idx(idx).ok == false
}

fn test_remove_cached_images_by_id_keeps_other_ids_valid() {
    mut ctx := gg.new_context(width: 100)
    background_bytes := os.read_bytes(background_path)!
    prev := ctx.create_image_from_byte_array(background_bytes)!
    curr := ctx.create_image_from_byte_array(background_bytes)!
    assert prev.id == 0
    assert curr.id == 1
    assert ctx.get_cached_image_by_idx(prev.id).ok == true
    assert ctx.get_cached_image_by_idx(curr.id).ok == true
    ctx.remove_cached_image_by_idx(prev.id)
    ctx.remove_cached_image_by_idx(curr.id)
    assert ctx.get_cached_image_by_idx(prev.id).ok == false
    assert ctx.get_cached_image_by_idx(curr.id).ok == false
}

fn test_new_context_sets_borderless_window_flag() {
    ctx := gg.new_context(
        width:             100
        borderless_window: true
    )
    assert ctx.window.borderless_window == true
}

fn test_new_context_sets_texture_filter() {
    ctx := gg.new_context(
        width:          100
        texture_filter: .nearest
    )
    assert ctx.config.texture_filter == .nearest
}

fn test_create_image_from_byte_array_loads_rgba_pixels() {
    mut ctx := gg.new_context(width: 100)
    background_bytes := os.read_bytes(background_path)!
    img := ctx.create_image_from_byte_array(background_bytes)!
    assert img.width > 0
    assert img.height > 0
    assert img.nr_channels == 4
    assert !isnil(img.data)
    assert img.texture_filter == .linear
    assert ctx.get_cached_image_by_idx(img.id).nr_channels == 4
}

fn test_create_image_from_byte_array_uses_context_texture_filter() {
    mut ctx := gg.new_context(
        width:          100
        texture_filter: .nearest
    )
    background_bytes := os.read_bytes(background_path)!
    img := ctx.create_image_from_byte_array(background_bytes)!
    assert img.texture_filter == .nearest
    assert ctx.get_cached_image_by_idx(img.id).texture_filter == .nearest
}

fn test_create_image_from_byte_array_with_filter_overrides_context_default() {
    mut ctx := gg.new_context(width: 100)
    background_bytes := os.read_bytes(background_path)!
    img := ctx.create_image_from_byte_array_with_filter(background_bytes, .nearest)!
    assert img.texture_filter == .nearest
    assert ctx.get_cached_image_by_idx(img.id).texture_filter == .nearest
}