#!/bin/bash
# Scan JS bundle(s) for WebGL/shader keywords and report tech stack
# Usage: scan-bundle.sh <file1.js> [file2.js ...]
# Output: keyword counts + tech stack guess

set -eu

if [ $# -eq 0 ]; then
    echo "Usage: scan-bundle.sh <file1.js> [file2.js ...]"
    echo "Scans JS files for WebGL/shader keywords and identifies tech stack."
    exit 1
fi

FILES=("$@")

echo "=== SHADER/WEBGL KEYWORD SCAN ==="
echo ""

# Core GLSL keywords
echo "--- GLSL Keywords ---"
for kw in "gl_FragColor" "gl_Position" "gl_PointSize" "gl_PointCoord" \
          "precision" "uniform" "varying" "attribute" \
          "FRAGMENT_SHADER" "VERTEX_SHADER" "createShader" \
          "sampler2D" "texture2D" "smoothstep" "discard"; do
    count=$(grep -o "$kw" "${FILES[@]}" 2>/dev/null | wc -l | tr -d ' ')
    [ "$count" -gt 0 ] && printf "  %-25s %s\n" "$kw" "$count" || true
done

echo ""
echo "--- WebGL/Canvas Keywords ---"
for kw in "canvas" "webgl" "webgl2" "getContext" "shader" "glsl" \
          "framebuffer" "renderbuffer" "drawArrays" "drawElements" \
          "bufferData" "texImage2D" "POINTS"; do
    count=$(grep -oi "$kw" "${FILES[@]}" 2>/dev/null | wc -l | tr -d ' ')
    [ "$count" -gt 0 ] && printf "  %-25s %s\n" "$kw" "$count" || true
done

echo ""
echo "--- Noise/Math Keywords ---"
for kw in "snoise" "simplex" "perlin" "noise" "PoissonDisk" "Poisson"; do
    count=$(grep -o "$kw" "${FILES[@]}" 2>/dev/null | wc -l | tr -d ' ')
    [ "$count" -gt 0 ] && printf "  %-25s %s\n" "$kw" "$count" || true
done

echo ""
echo "=== TECH STACK DETECTION ==="

detect() {
    local label="$1" pattern="$2"
    local count
    count=$(grep -oE "$pattern" "${FILES[@]}" 2>/dev/null | wc -l | tr -d ' ')
    [ "$count" -gt 0 ] && printf "  %-25s %s hits\n" "$label" "$count" || true
}

# Frameworks (patterns specific enough to avoid false positives)
detect "Three.js"              "THREE\.|WebGLRenderer|ShaderMaterial|BufferGeometry|PerspectiveCamera|OrthographicCamera"
detect "Three.js (minified)"   "setRenderTarget|DataTexture|setPixelRatio|setClearColor"
detect "PixiJS"                "PIXI\.|pixi\.js|PixiJS"
detect "Babylon.js"            "BABYLON\.|babylonjs"
detect "Raw WebGL"             "gl\.bindBuffer|gl\.bindTexture|gl\.useProgram|gl\.attachShader|gl\.linkProgram"
detect "Regl"                  "regl\(|regl\.frame|regl\.texture"
detect "OGL"                   "ogl\.|ogl/"

# Patterns
detect "GPGPU"                 "setRenderTarget|RenderTarget|ping.pong|gpgpu|GPGPU"
detect "Particles"             "gl_PointSize|gl_PointCoord|PointSize|particl"
detect "Post-processing"       "EffectComposer|RenderPass|ShaderPass|postprocess"
detect "Ray marching"          "rayMarch|sdSphere|sdBox|sdRoundBox"
detect "Instancing"            "InstancedMesh|InstancedBufferGeometry|instanceMatrix"

echo ""
echo "=== FILE SIZES ==="
for f in "${FILES[@]}"; do
    size=$(wc -c < "$f" | tr -d ' ')
    echo "  $(basename "$f"): ${size} bytes"
done