#!/usr/bin/env bash
set -eo pipefail

# --------------------------------------------------------------------
# Summary: Script to checkout a compatible
# repository and run `script/install`
#
# Required binaries:
#   curl
#   tar
#

echo "============================================================"
echo "Running \"$(basename "$0")\" at \"$(date)\""
echo "Running as \"$(whoami)\" on \"$(hostname)\""
echo "============================================================"

# Exit if wget is not installed
if ! command -v curl &> /dev/null; then
    echo "Failed: curl is not installed"
    exit 1
fi

# Exit if tar is not installed
if ! command -v tar &> /dev/null; then
    echo "Failed: tar is not installed"
    exit 1
fi

# Read and check if setup directory is empty
setup_dir=${DOTFILES_DIR:-$HOME/.dotfiles}
mkdir -p $setup_dir
if [[ -z $(ls -A $setup_dir) ]]; then
    echo "Setting up in directory \"$setup_dir\""
else
    echo "Failed: Setup directory not empty \"$setup_dir\""
    exit 1
fi

# Read GitHub repository and branch from environment variables
author=${GITHUB_AUTHOR:-andrejusk}
repository=${GITHUB_REPO:-dotfiles}
branch=${GITHUB_BRANCH:-master}

# Check if repository and branch exists
if curl -s "https://api.github.com/repos/$author/$repository" | grep -q "Not Found"; then
    echo "Failed: GitHub repository \"$author/$repository\" does not exist"
    exit 1
fi
if curl -s "https://api.github.com/repos/$author/$repository/branches/$branch" | grep -q "not found"; then
    echo "Failed: Branch \"$branch\" does not exist in GitHub repository \"$author/$repository\""
    exit 1
fi
echo "Using GitHub repository \"$author/$repository\" at \"$branch\""

# Download and extract repo
tmp_dir=$(mktemp -d)
tmp_dest="$tmp_dir/dotfiles.tar.gz"
checkout_url="https://github.com/$author/$repository/archive/$branch.tar.gz"
curl -sL $checkout_url -o $tmp_dest
tar -C $tmp_dir -zxf $tmp_dest
mv $tmp_dir/$repository-$branch/* $setup_dir
rm -rf $tmp_dir

# Run installer unless DOTFILES_SKIP_INSTALL is set
if [[ -z "$DOTFILES_SKIP_INSTALL" ]]; then
    $setup_dir/script/install
else
    echo "Skipping install"
fi