#!/bin/bash

function check_dependency() {
  if ! command -v "$1" &> /dev/null; then
    echo "Error: '$1' is not installed. Please install it."
    exit 1
  fi
}

# Check for jq and unzip
check_dependency jq
check_dependency unzip

CONFIG_FILE="patch-config.txt"

# Check if CONFIG_FILE exists
if [ ! -f "$CONFIG_FILE" ]; then
    echo "Config file '$CONFIG_FILE' not found! Assuming no patching needed."
    exit 0
fi

# Convert line endings to Unix format
sed -i 's/\r$//' "$CONFIG_FILE"

# Read configuration from file
source "$CONFIG_FILE"

# Get the latest hash
echo "Getting latest commit SHA hash"
latest_patch_sha=$(curl -s "https://gitgud.io/api/v4/projects/$username%2F$repo/repository/branches/$branch" | jq -r '.commit.id')

function download_extract() {
    # Download zip file
    echo "Downloading latest patch..."
    curl -sL "https://gitgud.io/$username/$repo/-/archive/$branch/$repo-$branch.zip" -o repo.zip

    # Extract contents, overwriting conflicts
    echo "Extracting..."
    unzip -qo repo.zip
    echo "Applying patch..."
    if [ -d "$repo-$branch/"www ]; then
        cp -r "$repo-$branch/"* .
        jq --arg repo "$repo" 'if (.name | test("^[[:space:]]*$")) then .name = $repo else . end' package.json > package.json
    else
        cp -r "$repo-$branch/"* ./www
    fi

    echo "Cleaning up..."
    rm repo.zip
    rm -rf "$repo-$branch"
    rm latest_patch_sha.txt

    # Store latest SHA for next check
    echo "$latest_patch_sha" > previous_patch_sha.txt
}

# Check if previous_patch_sha.txt exists
if [ ! -f previous_patch_sha.txt ]; then
    echo "Previous SHA hash not found!"
    echo "Assuming first time patching..."
    download_extract
else
    # Read the stored SHA from previous check
    previous_patch_sha=$(<previous_patch_sha.txt)

    # Compare trimmed SHAs
    if [ "$latest_patch_sha" != "$previous_patch_sha" ]; then
        echo "Update found! Patching..."
        download_extract
    else
        echo "Patch is up to date."
    fi
fi

exit 0