#version 450

layout(location = 0) in vec4 fragColor;
layout(location = 1) in vec2 fragTexCoord;
layout(location = 2) in vec2 fragPosition;

layout(location = 0) out vec4 outColor;

layout(binding = 0, std140) uniform UniformBufferObject {
    float time; // offset 0
    float resX; // offset 4
    float resY; // offset 8
    float rotation; // offset 12
    float wavePhase; // offset 16
    float paintingEnabled; // offset 20 (0.0 = locked, 1.0 = normal)
    float padding1; // offset 24
} ubo;

void main() {
    // Check if painting is disabled (locked state)
    if (ubo.paintingEnabled < 0.5) {
        // Locked state: dark gray background (matching CustomWidget)
        outColor = vec4(0.157, 0.157, 0.157, 1.0); // RGB(40, 40, 40)
        return;
    }

    // Normal state: animated gradient background
    // Normalize position to 0-1 range
    vec2 uv = (fragPosition + 1.0) * 0.5;

    // Create dynamic gradient based on time
    float t = ubo.time / 360.0;

    // Calculate color components matching Qt CustomWidget
    float r = 0.392 + 0.196 * sin(t * 6.28318);
    float g = 0.588 + 0.196 * sin(t * 6.28318 + 1.047);
    float b = 0.784 + 0.216 * sin(t * 6.28318 + 2.094);

    vec3 color1 = vec3(r, g, b);
    vec3 color2 = vec3(0.118, 0.118, 0.235);

    // Linear gradient from top-left to bottom-right
    float gradient = uv.x * 0.5 + uv.y * 0.5;

    // Mix colors
    vec3 finalColor = mix(color1, color2, gradient);

    outColor = vec4(finalColor, 1.0);
}