#!/bin/bash

# Script to process new images from new-images/ directory
# Checks for duplicates using checksums, converts to WebP, and continues numbered sequence

set -e

# Directory paths
NEW_IMAGES_DIR="./new-images"
IMAGES_DIR="./images"
TEMP_CHECKSUMS="/tmp/existing_checksums.txt"
TEMP_NEW_CHECKSUMS="/tmp/new_checksums.txt"

# Check if directories exist
if [ ! -d "$NEW_IMAGES_DIR" ]; then
    echo "Error: $NEW_IMAGES_DIR directory not found"
    exit 1
fi

if [ ! -d "$IMAGES_DIR" ]; then
    echo "Error: $IMAGES_DIR directory not found"
    exit 1
fi

# Check if there are any images to process
if [ -z "$(ls -A $NEW_IMAGES_DIR 2>/dev/null)" ]; then
    echo "No images found in $NEW_IMAGES_DIR"
    exit 0
fi

echo "Starting image processing..."

# Find the highest number in the existing sequence
HIGHEST_NUM=$(ls "$IMAGES_DIR"/*.webp 2>/dev/null | sed 's/.*\///' | sed 's/\.webp$//' | sort -n | tail -1)
if [ -z "$HIGHEST_NUM" ]; then
    HIGHEST_NUM=0
fi
echo "Highest existing number: $HIGHEST_NUM"
NEXT_NUM=$((HIGHEST_NUM + 1))

# Generate checksums for existing images
echo "Generating checksums for existing images..."
find "$IMAGES_DIR" -type f \( -name "*.png" -o -name "*.jpg" -o -name "*.jpeg" -o -name "*.webp" \) -exec md5sum {} \; | awk '{print $1}' | sort > "$TEMP_CHECKSUMS"

# Process each new image
PROCESSED=0
SKIPPED=0

for img in "$NEW_IMAGES_DIR"/*; do
    # Skip if not a file
    [ -f "$img" ] || continue

    # Get file extension
    ext="${img##*.}"
    ext_lower=$(echo "$ext" | tr '[:upper:]' '[:lower:]')

    # Only process image files
    if [[ ! "$ext_lower" =~ ^(jpg|jpeg|png|gif|bmp|tiff|webp)$ ]]; then
        echo "Skipping non-image file: $(basename "$img")"
        continue
    fi

    # Calculate checksum of new image
    NEW_CHECKSUM=$(md5sum "$img" | awk '{print $1}')

    # Check if checksum already exists
    if grep -q "^${NEW_CHECKSUM}$" "$TEMP_CHECKSUMS"; then
        echo "Duplicate found (checksum match): $(basename "$img") - skipping"
        SKIPPED=$((SKIPPED + 1))
        continue
    fi

    # Convert to WebP with numbered filename
    OUTPUT_FILE="${IMAGES_DIR}/${NEXT_NUM}.webp"

    echo "Processing: $(basename "$img") -> ${NEXT_NUM}.webp"

    # Convert to WebP using ImageMagick or cwebp
    if command -v cwebp &> /dev/null; then
        cwebp -q 85 "$img" -o "$OUTPUT_FILE" 2>/dev/null
    elif command -v convert &> /dev/null; then
        convert "$img" -quality 85 "$OUTPUT_FILE"
    else
        echo "Error: Neither cwebp nor ImageMagick (convert) found. Please install one of them."
        exit 1
    fi

    # Add new checksum to temp file to avoid processing duplicates in same run
    echo "$NEW_CHECKSUM" >> "$TEMP_CHECKSUMS"

    PROCESSED=$((PROCESSED + 1))
    NEXT_NUM=$((NEXT_NUM + 1))
done

# Cleanup
rm -f "$TEMP_CHECKSUMS" "$TEMP_NEW_CHECKSUMS"

echo ""
echo "Processing complete!"
echo "Images processed: $PROCESSED"
echo "Images skipped (duplicates): $SKIPPED"
echo "Next available number: $NEXT_NUM"