#!/bin/bash

# origin package directory
packages_dir="/srv/gitolite/deploy/packages"
# temporary work directory
deploy_dir="/srv/deploy_dir"
# scripts to deploy packages
deploy_scripts="/srv/gitolite/deploy/scripts"

function get_script(){
    # receives package path return script to call
    local pkg_path=$1
    echo $(head -2 ${pkg_path}/project | tail -1)
}

function get_new(){
    # receives package path return commit hash (new)
    local pkg_path=$1
    echo $(head -3 ${pkg_path}/project | tail -1)
}

function get_dep(){
    # receives package path return previews commit hash (old)
    local pkg_path=$1

    new=$(head -3 ${pkg_path}/project | tail -1)
    old=$(head -4 ${pkg_path}/project | tail -1)

    if [[ ! ${new} = ${old} ]]; then
        echo ${old} | cut -c1-7
    fi
}

function project_extract(){

    # project directory containing extracted packages
    local prj_dir=$1

    # final extracted package
    local prj_pkg="${prj_dir}/package"

    # temporary vars for swapping/iterating pkg_news
    local pkg_new=""
    local pkg_old=""
    local pkg_dir=""
    local pkg_temp=""
    local pkg_next=1
    local pkg_del=""
    local x=0
    local y=0

    # array with all the news hashes
    local pkg_news=($(ls ${prj_dir}))

    # total new packages
    local total=${#pkg_news[@]}

    echo "Deploy: $(basename ${prj_dir}) extracting packages ${pkg_news[*]}"

    # find first package
    for pkg_new in ${pkg_news[@]}
    do
        # get package dependency
        pkg_dir="${prj_dir}/${pkg_new}"
        pkg_old=$(get_dep ${pkg_dir})
        if [[ ! " ${pkg_news[@]} " =~ " ${pkg_old} " ]]; then
            # pkg_news don't contain package
            # we found initial package
            pkg_temp=${pkg_news[0]}
            pkg_news[0]=${pkg_new}
            pkg_news[${x}]=${pkg_temp}
            break
        fi
        x=$((${x}+1))
    done

    # Order packages by dependency start with first package
    for (( y=0; y<${total}; y++ ))
    do
        pkg_next=$(($y+1))
        if [[ ${pkg_next} = ${total} ]]; then
            ## we are in the last one
            break
        fi

        pkg_new=${pkg_news[$y]}
        for (( x=pkg_next; x<${total}; x++ ))
        do
            pkg_dir="${prj_dir}/${pkg_news[${x}]}"
            pkg_old=$(get_dep ${pkg_dir})
            # is dependent on current
            if [[ ${pkg_old} = ${pkg_new} ]]; then
                pkg_temp=${pkg_news[${pkg_next}]}
                pkg_news[${pkg_next}]=${pkg_news[${x}]}
                pkg_news[${x}]=${pkg_temp}
                # we can break and pass next one
                break
            fi
        done
    done

    # create project final package directory
    mkdir -p ${prj_pkg}/files

    # copy project information of last commit
    cp ${prj_dir}/${pkg_news[$((${total}-1))]}/project ${prj_pkg}

    # now that packages are ordered we can start creating files
    for pkg_new in ${pkg_news[@]}
    do
        pkg_dir=${prj_dir}/${pkg_new}
        tar xf ${pkg_dir}/files.tar.xz \
            --directory ${prj_pkg}/files

        # if deleted files exists
        if [ -f "${pkg_dir}/deleted" ]; then
            # first collect all files/directories don't exist
            while read pkg_del; do
                # if file don't exist add entry to project deleted file
                pkg_temp="${prj_pkg}/files/${pkg_del}"
                if [ ! -f ${pkg_temp} ]; then
                    if [ ! -d ${pkg_temp} ]; then
                        # is not a file or directory from previous packages
                        echo ${pkg_del} >> ${prj_pkg}/deleted
                    fi
                fi
            done <${prj_dir}/${pkg_new}/deleted

            # delete directories and files
            while read pkg_del; do
                pkg_temp="${prj_pkg}/files/${pkg_del}"
                if [ -d ${pkg_temp} ]; then
                    rm -r ${pkg_temp}
                elif [ -f ${pkg_temp} ]; then
                    rm ${pkg_temp}
                fi
            done <${prj_dir}/${pkg_new}/deleted
        fi

        #remove temporary directory
        rm -r ${prj_dir}/${pkg_new}
    done

    # call project deploy script
    call_script=${deploy_scripts}/$(get_script $prj_pkg)
    echo "Deploy: calling deploy script: ${call_script}"
    /bin/bash ${call_script} ${prj_pkg}

}

if [[ ! $(ls ${deploy_dir}) = "" ]]; then
    rm -r ${deploy_dir}/*
fi

# first extract all packages from origin directory
for pkg_path in `find ${packages_dir} -type f -name "*.tar.gz"`
do
    if [ -f ${pkg_path} ]; then
        pkg_name=$(basename ${pkg_path})
        pkg_proj=$(echo ${pkg_name} | cut -d "_" -f 1)
        pkg_new7=$(echo ${pkg_name} | tail -c -15 | cut -c -7)
        pkg_temp=${deploy_dir}/${pkg_proj}/${pkg_new7}
        mkdir -p ${pkg_temp}
        tar xf ${pkg_path} --directory ${pkg_temp}
        rm ${pkg_path}
    fi
done

# loop for all projects and deploy them
for prj_dir in `find ${deploy_dir} -maxdepth 1 -mindepth 1 -type d`
do
    # order index of hashes based on old commit
    echo "prj_dir $prj_dir"
    project_extract ${prj_dir}
done