#!/bin/bash
# Fetch Octicon icons and convert them to PNG for embedding in the MCP server.
# Generates both light theme (dark icons) and dark theme (white icons) variants.
# Uses sed to modify SVG fill color before converting to PNG.
# Requires: rsvg-convert (from librsvg2-bin on Ubuntu/Debian)
#
# Usage:
#   script/fetch-icons              # Fetch all required icons
#   script/fetch-icons icon1 icon2  # Fetch specific icons

set -e

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
REPO_ROOT="$(cd "$SCRIPT_DIR/.." && pwd)"
ICONS_DIR="$REPO_ROOT/pkg/octicons/icons"
REQUIRED_ICONS_FILE="$REPO_ROOT/pkg/octicons/required_icons.txt"
OCTICONS_BASE="https://raw.githubusercontent.com/primer/octicons/main/icons"

# Check for rsvg-convert
if ! command -v rsvg-convert &> /dev/null; then
    echo "Error: rsvg-convert not found. Install with:"
    echo "  Ubuntu/Debian: sudo apt-get install librsvg2-bin"
    echo "  macOS: brew install librsvg"
    exit 1
fi

# Load icons from required_icons.txt or use command-line arguments
if [ $# -gt 0 ]; then
    ICONS=("$@")
else
    if [ ! -f "$REQUIRED_ICONS_FILE" ]; then
        echo "Error: Required icons file not found: $REQUIRED_ICONS_FILE"
        exit 1
    fi
    # Read icons from file, skipping comments and empty lines
    mapfile -t ICONS < <(grep -v '^#' "$REQUIRED_ICONS_FILE" | grep -v '^$')
fi

# Ensure icons directory exists
mkdir -p "$ICONS_DIR"

echo "Fetching ${#ICONS[@]} icons (24px, light + dark themes)..."

for icon in "${ICONS[@]}"; do
    svg_url="${OCTICONS_BASE}/${icon}-24.svg"
    light_file="${ICONS_DIR}/${icon}-light.png"
    dark_file="${ICONS_DIR}/${icon}-dark.png"
    
    echo "  ${icon} (light + dark)"
    
    # Download SVG
    svg_content=$(curl -sfL "$svg_url" 2>/dev/null) || {
        echo "    Warning: Failed to fetch ${icon}-24.svg (may not exist)"
        continue
    }
    
    # Light theme: dark icons (#24292f) for light backgrounds
    # Add fill attribute to the svg tag
    light_svg=$(echo "$svg_content" | sed 's/<svg /<svg fill="#24292f" /')
    echo "$light_svg" | rsvg-convert -o "$light_file"
    
    # Dark theme: white icons (#ffffff) for dark backgrounds
    dark_svg=$(echo "$svg_content" | sed 's/<svg /<svg fill="#ffffff" /')
    echo "$dark_svg" | rsvg-convert -o "$dark_file"
done

echo "Done. Icons saved to $ICONS_DIR"
echo ""
echo "Next steps:"
echo "  1. Run 'go test ./pkg/octicons/...' to verify icons are embedded"
echo "  2. Run 'go test ./pkg/github/...' to verify toolset icons are valid"
echo "  3. Commit the new icon files"