#!/bin/sh

# Determine the absolute path of the script
SCRIPT_PATH=$(realpath "$0")

download() {
    if [ "$1" = "github" ]; then
        download_github_directory "$2" "$3"
    else
        download_file "$1" "$2"
    fi
}

download_file() {
    url="$1"
    output="${2:-$(basename "$url")}"

    echo "Attempting to download file from URL: $url"
    echo "Saving to output: $output"

    # Ensure the output directory exists
    mkdir -p "$(dirname "$output")"

    if command -v curl > /dev/null 2>&1; then
        curl -L -o "$output" "$url"
    elif command -v wget > /dev/null 2>&1; then
        wget -O "$output" "$url"
    else
        echo "Error: Neither curl nor wget is available."
        exit 1
    fi
}

download_github_directory() {
    github_url="$1"
    output_dir="${2:-.}"  # Set output directory to the provided parameter or current directory

    repo_info=$(echo "$github_url" | sed -n 's|https://github.com/\([^/]*\)/\([^/]*\)/tree/\([^/]*\)/\(.*\)|\1 \2 \3 \4|p')
    owner=$(echo "$repo_info" | cut -d' ' -f1)
    repo=$(echo "$repo_info" | cut -d' ' -f2)
    branch=$(echo "$repo_info" | cut -d' ' -f3)
    directory=$(echo "$repo_info" | cut -d' ' -f4)

    echo "Owner: $owner, Repo: $repo, Branch: $branch, Directory: $directory"

    if [ -z "$owner" ] || [ -z "$repo" ] || [ -z "$branch" ] || [ -z "$directory" ]; then
        echo "Error: Invalid GitHub URL."
        exit 1
    fi

    echo "Output directory set to: $output_dir"

    api_url="https://api.github.com/repos/$owner/$repo/contents/$directory?ref=$branch"
    echo "Fetching directory contents from API URL: $api_url"

    if command -v curl > /dev/null 2>&1; then
        contents=$(curl -s -H "Accept: application/vnd.github.v3+json" "$api_url")
    elif command -v wget > /dev/null 2>&1; then
        contents=$(wget -qO- --header="Accept: application/vnd.github.v3+json" "$api_url")
    else
        echo "Error: Neither curl nor wget is available."
        exit 1
    fi

    echo "API Response Contents:"
    echo "$contents"

    # Use awk to parse JSON content and prepare commands
    echo "$contents" | awk -v output_dir="$output_dir" -v owner="$owner" -v repo="$repo" -v branch="$branch" -v script_path="$SCRIPT_PATH" '
    BEGIN {
        RS="},"; FS=","; # Set Record Separator to "}," and Field Separator to ","
    }
    /"type": "file"/ {
        file_path = ""; download_url = "";
        for (i = 1; i <= NF; i++) {
            if ($i ~ /"path": "/) {
                gsub(/.*"path": "/, "", $i);
                gsub(/".*/, "", $i);
                file_path = $i;
            }
            if ($i ~ /"download_url": "/) {
                gsub(/.*"download_url": "/, "", $i);
                gsub(/".*/, "", $i);
                download_url = $i;
            }
        }
        if (file_path && download_url) {
            output_file_path = output_dir "/" file_path;
            print "Calling download_file for:", download_url, "to", output_file_path;
            system("'"$SCRIPT_PATH"'" " \"" download_url "\" \"" output_file_path "\"");
        }
    }
    /"type": "dir"/ {
        sub_dir = "";
        for (i = 1; i <= NF; i++) {
            if ($i ~ /"path": "/) {
                gsub(/.*"path": "/, "", $i);
                gsub(/".*/, "", $i);
                sub_dir = $i;
            }
        }
        if (sub_dir) {
            print "Calling download_github_directory for sub-directory:", sub_dir;
            system("'"$SCRIPT_PATH"'" " github \"https://github.com/" owner "/" repo "/tree/" branch "/" sub_dir "\" \"" output_dir "\"");
        }
    }'
}

if [ "$#" -eq 0 ]; then
    echo "Usage: download <type> <url> [output_directory]"
    exit 1
else
    download "$@"
fi