shader_type canvas_item;

uniform sampler2D noise_tex : source_color;
uniform float time_speed = 1.5;
uniform float distortion_amount = 0.12;
uniform float flame_height = 1.4;

uniform vec4 inner_color : source_color = vec4(1.0, 0.9, 0.4, 1.0);  // hot core
uniform vec4 outer_color : source_color = vec4(1.0, 0.4, 0.0, 1.0);  // orange rim

void fragment() {
    vec2 uv = UV;

    // Make the flame taller
    uv.y *= flame_height;

    float t = TIME * time_speed;

    // Sample noise that scrolls upward
    vec2 noise_uv = mod(vec2(uv.x, uv.y + t * 0.6), vec2(1.0));
    float n = texture(noise_tex, noise_uv).r;

    // Horizontal distortion based on noise
    uv.x += (n - 0.5) * distortion_amount;
    // Slight vertical wobble
    uv.y -= (n - 0.5) * 0.1;

    // Remap coords so bottom center is the origin
    vec2 p = uv - vec2(0.5, 1.0);

    // Elliptical falloff (wider at base)
    float dist = length(vec2(p.x * 1.8, p.y * 1.2));

    // Base flame shape (soft circle-ish blob)
    float core = smoothstep(0.9, 0.0, dist);

    // Only show above the base (cut off below)
    float cutoff = smoothstep(-0.2, 0.2, p.y); // fade out below the base
    core *= cutoff;

    // Extra shaping towards the tip (thinner at top)
    float tip = smoothstep(0.0, 0.7, uv.y);
    core *= tip;

    // Final intensity
    float intensity = core;

    if (intensity <= 0.001) {
        discard;
    }

    // Color blend from outer to inner
    vec4 col = mix(outer_color, inner_color, intensity);

    // Alpha from intensity
    float alpha = clamp(intensity, 0.0, 1.0);

    COLOR = vec4(col.rgb * intensity * 2.0, alpha);
}