#!/bin/bash

set -e
SRC_DIR="./videos/frames"
OUT_DIR="./frames_upload_chunks"
CHUNK_SIZE=50  # 每包打 50 个文件夹
PREFIX="frames_chunk"

mkdir -p "$OUT_DIR"
all_folders=($(ls "$SRC_DIR" | sort))

total=${#all_folders[@]}
chunk=0

for ((i=0; i<total; i+=CHUNK_SIZE)); do
    chunk_dir=$(printf "%s/%s_%03d" "$OUT_DIR" "$PREFIX" "$chunk")
    mkdir -p "$chunk_dir"

    for ((j=i; j<i+CHUNK_SIZE && j<total; j++)); do
        name=${all_folders[$j]}
        echo "Copying $name to $chunk_dir"
        cp -r "$SRC_DIR/$name" "$chunk_dir/"
    done

    tar_path="$OUT_DIR/${PREFIX}_${chunk}.tar"
    echo "Creating tar: $tar_path"
    tar -cf "$tar_path" -C "$chunk_dir" .

    rm -r "$chunk_dir"
    echo "Chunk $chunk done."
    ((chunk++))
done

echo "✅ All chunks created in $OUT_DIR/"