#!/bin/bash
#
# Checks for dependencies and install them, if needed.
#
# A valid package description is defined as follows:
#  local <package>_name=<name>
#  local <package>_type=<type>
#  local <package>_archive=<archive>
#  local <package>_dir=<dir>
#  local <package>_url=<url>
#
# <package> - symbolid id of package
# <name>    - name of the package (used for pkg-config)
# <type>    - type of project ("cmake" or "autotools")
# <archive> - archive file name
# <dir>     - dir of package sources
# <url>     - url of the project archive
#
# For examples, see below.
#
# Since <package>_ variables are not used directly, shellcheck will complain:
# shellcheck disable=SC2034


#######################################
# Installs a cmake package.
#
# Arguments:
#   package - name of package
# Returns:
#   0 on success, otherwise failure
#######################################
function install_cmake_package() {
    local package="$1"
    local archive="${package}_archive"
    local dir="${package}_dir"
    local url="${package}_url"

    wget -O "${!archive}" "${!url}" && \
    tar -xf "${!archive}" && \
    cd "${!dir}" && \
    mkdir .build && \
    cd .build && \
    cmake .. && \
    make && \
    sudo make install && \
    cd .. && \
    cd ..

    return "$?"
}

#######################################
# Installs a autotools package.
#
# Arguments:
#   package - name of package
# Returns:
#   0 on success, otherwise failure
#######################################
function install_autotools_package() {
    local package="$1"
    local archive="${package}_archive"
    local dir="${package}_dir"
    local url="${package}_url"

    wget -O "${!archive}" "${!url}" && \
    tar -xf "${!archive}" && \
    cd "${!dir}" && \
    ./makeconf.sh && \
    ./configure && \
    make && \
    sudo make install && \
    cd ..

    return "$?"
}

#######################################
# Checks, whether a package exists.
#
# Arguments:
#   package_name - name of package
# Returns:
#   0 if package exists, otherwise failure
#######################################
function package_exists() {
    local package_name="$1"

    pkg-config --exists "${package_name}"
    return "$?"
}

#######################################
# Installs a package, if it is not available.
#
# Arguments:
#   package - name of package
# Returns:
#   0 if package exists, otherwise failure
#######################################
function install_if_needed() {
    local package="$1"
    local package_name="${package}_name"
    local package_type="${package}_type"
    local result=0

    package_exists "${!package_name}"
    if [[ "$?" -ne 0 ]]; then
        "install_${!package_type}_package" "$package"
        result="$?"
    fi

    return "${result}"
}

#######################################
# Main
#
# Arguments:
#   None
# Returns:
#   0 on success, otherwise failure
#######################################
function main() {
    rm -rf .deps
    mkdir .deps
    cd .deps

    local packages=(fuse3 lws jansson gtest)

    local fuse3_name=fuse3
    local fuse3_type=autotools
    local fuse3_archive=fuse-3.1.1.tar.gz
    local fuse3_dir=libfuse-fuse-3.1.1
    local fuse3_url=https://github.com/libfuse/libfuse/archive/fuse-3.1.1.tar.gz

    local lws_name=libwebsockets
    local lws_type=cmake
    local lws_archive=libwebsockets-3.1.0.tar.gz
    local lws_dir=libwebsockets-3.1.0
    local lws_url=https://github.com/warmcat/libwebsockets/archive/v3.1.0.tar.gz

    local jansson_name=jansson
    local jansson_type=cmake
    local jansson_archive=libjansson-2.12.tar.gz
    local jansson_dir=jansson-2.12
    local jansson_url=https://github.com/akheron/jansson/archive/v2.12.tar.gz
 
    local gtest_name=gtest_main
    local gtest_type=cmake
    local gtest_archive=gtest-1.8.1.tar.gz
    local gtest_dir=googletest-release-1.8.1
    local gtest_url=https://github.com/google/googletest/archive/release-1.8.1.tar.gz

    local result=0
    local package=""
    for package in "${packages[@]}" ; do
        install_if_needed $package
        result="$?"

        if [[ "${result}" -ne 0 ]] ; then
            cd ..
            return "${result}"
        fi
    done

    cd ..
    return 0
}

main "$@"