#!/usr/bin/env bash
# Renames images and videos in ./ based on metadata date
# Requires: exiftool
# Format: YYYY-MM-DD_HH-MM-SS.ext (appends _N if duplicate)

set -euo pipefail

TARGET="${1:-.}"

if ! command -v exiftool &>/dev/null; then
    echo "Error: exiftool not found. Install it with: sudo apt install libimage-exiftool-perl" >&2
    exit 1
fi

shopt -s nullglob nocaseglob
files=("$TARGET"/*.{jpg,jpeg,png,tiff,tif,heic,webp,mp4,mov,m4v,avi,mkv,webm})
shopt -u nullglob nocaseglob

if [[ ${#files[@]} -eq 0 ]]; then
    echo "No image files found in: $TARGET"
    exit 0
fi

for file in "${files[@]}"; do
    [[ -f "$file" ]] || continue

    dir=$(dirname "$file")
    ext="${file##*.}"
    ext_lower="${ext,,}"

    # Try date tags in priority order
    date_str=$(exiftool -d "%Y-%m-%d_%H-%M-%S" \
        -DateTimeOriginal \
        -CreateDate \
        -ModifyDate \
        -FileModifyDate \
        -s3 "$file" 2>/dev/null | head -1)

    if [[ -z "$date_str" || "$date_str" == *"0000"* ]]; then
        echo "SKIP (no date): $file"
        continue
    fi

    new_base="$dir/${date_str}.${ext_lower}"

    # Handle duplicates
    if [[ "$file" == "$new_base" ]]; then
        echo "OK (unchanged): $file"
        continue
    fi

    counter=1
    final="$new_base"
    while [[ -e "$final" ]]; do
        final="$dir/${date_str}_${counter}.${ext_lower}"
        ((counter++))
    done

    mv -- "$file" "$final"
    echo "RENAMED: $(basename "$file") -> $(basename "$final")"
done