#!/bin/bash
# set -x 

GIT_SSL_NO_VERIFY=true

commit_before_pull=""

# save the last commit before executing 'git pull'
save_commit_before_pull () {
    # git reflog -> 46c5896 HEAD@{0}: commit: Made update_helpers.sh executable
    commit_before_pull=$(git reflog | grep "HEAD@{0}" | cut -d" " -f1)
    if ! [ -z "$commit_before_pull" ]; then
        if grep -qE "^[[:xdigit:]]{6,}$" <<< $commit_before_pull; then
            return 0
        fi
    fi
    commit_before_pull=""
    return 1
}
# save_commit_before_pull

# fallback if something went wrong: revert to last valid commit
revert_to_commit_before_pull () {
    if ! [ -z "$commit_before_pull" ]; then
        if grep -qE "^[[:xdigit:]]{6,}$" <<< $commit_before_pull; then
            `git reset --hard "$commit_before_pull"`
            if [ $? -eq 0 ]; then
                return 0
            fi
        fi
    fi
    return 1
}
# revert_to_commit_before_pull

# clone the customer repository in ./UpdateController/workspace.
# this is done only once.
clone_customer_repository () {
    current_dir=${PWD##*/}
    current_dir="./${current_dir:-/}"
    if [ "$current_dir" = "./UpdateController" ]; then
        if ! [[ -d ./workspace ]]; then
            { mkdir -p ./workspace; }
        fi
        # check if the directory is empty. If so, clone the
        # customer repository
        if ! find ./workspace -mindepth 1 -maxdepth 1 | read; then
            echo "cloning ${1} ..."
            ( cd ./workspace && git clone "$1" ; )
        fi
    fi
}
# clone_customer_repository https://git.mimbach49.de/GerhardHoffmann/customer_281.git

pull_customer_repository () {
    # has to be called in ./UpdateController
    current_dir=${PWD##*/}
    current_dir="./${current_dir:-/}"
    if [ "$current_dir" = "./UpdateController" ]; then
        repository_dir="./workspace/$1"
        if ! [[ -d "$repository_dir" ]]; then
            printf "%s\n" "$repository_dir does not exist!" >&2
            return 1
        fi
        if [ "$(cd $repository_dir && git pull)" = "Already up to date." ]; then
            printf "%s\n" "$repository_dir already up to date." >&2
            return 1
        fi
    else
        printf "%s\n" "${FUNCNAME[0]} not called in ./UpdateController" >&2
        return 1
    fi

    return 0
}
# pull_customer_repository customer_281