#!/usr/bin/env bash

cat > /tmp/blfs_sudo << EOF
blfs ALL = NOPASSWD: /usr/bin/make install*
EOF

if [ "$(whoami)" != "blfs" ]
then
    echo "Please execute this script as user blfs"
    echo "# groupadd blfs"
    echo "# useradd -g blfs -m blfs"
    echo "# passwd blfs"
    exit 1
fi

set -ueEo pipefail

# shellcheck source=/dev/null
if [ ! -e "${HOME}"/.blfsbuild_config ]
then
    cat > "${HOME}"/.blfsbuild_config << EOSF
# location of local package sources
BLFS_PACKAGE_DIR=${HOME}/packages
# Number of processors to use
BLFS_NPROC=$(nproc)
# Bypass step by step validation until a breakpoint
BLFS_BREAKPOINT=1
# strip binaries or not
BLFS_STRIP_BINARIES=true
EOSF
fi

# shellcheck source=/dev/null
source "${HOME}"/.lfsbuild_config

SCRIPT_DIR="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)"
BLFS_PACKAGE_DIR=${BLFS_PACKAGE_DIR:-/home/blfs/packages}
BLFS_NPROC=${BLFS_NPROC:-$(nproc)}
BLFS_BREAKPOINT=${LFS_BREAKPOINT:-1000000}
BLFS_STRIP_BINARIES=${BLFS_STRIP_BINARIES:-false}

ask_for_exit()
{
    echo "----- call ask_for_exit $1"
    echo "find ${SCRIPT_DIR}/build/ \( -name \"*.sh\" -or -name \"*.txt\" \) -print |sort |grep --context=1 \$(cat ${HLFSB})"
    find "${SCRIPT_DIR}/build/" \( -name "*.sh" -or -name "*.txt" \) -print |sort |grep --context=1 "$(cat "${HLFSB}")"
    echo "ask_for_exit : args = $* && $1 < ${BLFS_BREAKPOINT} (BLFS_BREAKPOINT) || $1 < $(cat "${HLFSB}") (HLFSB) || ${BLFS_BREAKPOINT} (BLFS_BREAKPOINT) > $(cat "${HLFSB}") (HLFSB) "
    if [[ $# -eq 1 ]] && [[ $1 -ge 10000 ]] && [[ $1 -lt 10000000 ]] && [[ $1 -lt ${BLFS_BREAKPOINT} ]]
    then
        echo "BLFS_BREAKPOINT : validation disabled"
        return 0
    elif [[ $# -eq 1 ]] && [[ $1 -ge 10000 ]] && [[ $1 -lt 10000000 ]] && [[ $1 -lt $(cat "${HLFSB}") ]]
    then
        echo "STEP_COUNTER : already done. validation disabled"
        return 0
    elif [[ $# -eq 1 ]] && [[ $1 -ge 10000 ]] && [[ $1 -lt 10000000 ]] && [[ ${BLFS_BREAKPOINT} -gt $(cat "${HLFSB}") ]]
    then
        echo "BLFS_BREAKPOINT : validation forced"
        return 0
    else
        USER_ANSWER="?";
        while [ "${USER_ANSWER}" != "n" ] && [ "${USER_ANSWER}" != "y" ] ; do
            echo -n "Continue ? [y/n]"
            read -r -n 1 USER_ANSWER
            echo "";
        done
        if [ "$USER_ANSWER" == "n" ]
        then
            exit 0
        fi
    fi
}

ask_for_execution() {
    USER_ANSWER="?";
    while [ "${USER_ANSWER}" != "n" ] && [ "${USER_ANSWER}" != "y" ] && [ "${USER_ANSWER}" != "q" ]
    do
        echo -n "Execute ? [y/n/q]"
        read -r -n 1 USER_ANSWER
        echo "";
    done
    if [ "$USER_ANSWER" == "y" ]
    then
        return 0
    elif [ "$USER_ANSWER" == "n" ]
    then
        return 1
    elif [ "$USER_ANSWER" == "q" ]
    then
        exit 0
    else
        exit 0
    fi
}

cat > "${HOME}"/.bashrc << EOF
set +h
umask 022
export PATH=/usr/bin
export MAKEFLAGS=-j${BLFS_NPROC}
export ARCH=$(uname -m)
export LC_ALL=POSIX
export SOURCES=/sources
export SLFSB=/sources/lfs_build
EOF

# shellcheck source=/dev/null
source "${HOME}"/.bashrc

describe()
{
    case $1 in
        w3m)
            echo "w3m is a text browser"
        ;;
        *)
            echo "Unknown package"
            exit 1
        ;;
    esac
 
}

check_installed()
{
    chapter=$1 
    package=$2

    check()
    {
        proof=$1
        echo "$ find /usr -name ${proof} (${package})"
        if [ ! -e "${proof}" ]
        then
            echo "FAILED: ${proof} not found"
            describe "${package}"
            exit 1
        fi
    }

    case ${package} in
        w3m)
            check /usr/bin/w3m
        ;;
        *)
            echo "Unkwnown package : ${package}"
            exit 1
        ;;
    esac
}

check_sources()
{
    echo "call check_sources"
    while IFS= read -r line
    do
        echo "Line: $line"
        local packagefilename=${line##*/}
        echo "${packagefilename}"
        [ -d "${BLFS_PACKAGE_DIR}" ] && mkdir -v "${BLFS_PACKAGE_DIR}"
        pushd "${BLFS_PACKAGE_DIR}"
            md5sum --check "${SCRIPT_DIR}/md5sums"
            ret=$?
        popd
        return ${ret}
    done < "${SCRIPT_DIR}/wget-list-systemd.txt"
}

check_download()
{
    echo "call check_download"
    wget --input-file=wget-list-systemd.txt --continue --directory-prefix="${BLFS_PACKAGE_DIR}"
    ret=$?
    return ${ret}
}

check_errors()
{
    echo "call check_errors $1"
    if [[ $# -ne 1 ]]
    then
        echo "bad argument in function call"
        return 1
    fi
    logfile=$1
    if grep "Permission denied" "${logfile}"
    then
        echo "Rights error"
        exit 1
    fi
#    if grep "configure: error" "${logfile}"
#    then
#        echo "Configure Error"
#        cat "${buildpath}"/config.log
#        exit 1
#    fi
    if grep "^make: .* Error .*$" "${logfile}"
    then
        echo "Make Error"
        exit 1
    fi
}

copy_sources()
{
    echo "call copy_sources"
    echo cp --verbose "${BLFS_PACKAGE_DIR}"/* /sources/
    if cp --verbose "${BLFS_PACKAGE_DIR}"/* /sources/
    then
        return 0
    else
        return 1
    fi
}

copy_scripts()
{
    echo "call copy_scripts"
    echo cp --verbose "${SCRIPT_DIR}"/build/* /sources/
    if cp --verbose "${SCRIPT_DIR}"/build/* /sources/
    then
        return 0
    else
        return 1
    fi
}

main() {

    cd "$SCRIPT_DIR"

    echo "1001000" > "${SLFSB}"

    echo "Chapter 1. Welcome to BLFS"

### DOWNLOAD PACKAGES ###
    echo "Getting the Source Packages"
    if [[ $(cat "${SLFSB}") -lt 1001010 ]]
    then
        if ! check_sources
        then
            echo "Some package are missing"
            if ! download
            then
                echo "Some package are unavailable"
                echo "Try manually"
                exit 1
            fi
        else
            echo "1001010" > "${SLFSB}"
        fi
    fi

    if [[ $(cat "${SLFSB}") -lt 1001020 ]]
    then
        if ! check_sources
        then
            echo "Some package are unavailable"
            echo "Fix it manually"
            exit 1
        else
            echo "1001020" > "${SLFSB}"
        fi
    fi   

    ask_for_exit 1001020

### COPY SOURCES ###

    echo "Copy sources"
    if [[ $(cat "${SLFSB}") -lt 1001030 ]]
    then
        if ! copy_sources
        then
            echo "Copy packages to sources failed"
            exit 1
        else
            echo "1001030" > "${SLFSB}"
        fi
    fi

    ask_for_exit 1001030

    echo "Copy scripts"
    if [[ $(cat "${SLFSB}") -lt 1001040 ]]
    then
        if ! copy_scripts
        then
            echo "Copy scripts to sources failed"
            exit 1
        else
            echo "1001040" > "${SLFSB}"
        fi
    fi

#########################################
### Begin to follow steps on target #####
#########################################

    ask_for_exit 1000040

    echo "Chapter 2. Important Information"
    echo "Install strip script"
    if [[ $(cat "${SLFSB}") -lt 1002010 ]]
    then
        if ! sudo make install-strip-all
        then
            echo "Copy failed"
            exit 1
        else
            echo "1002010" > "${SLFSB}"
        fi
    fi

    ask_for_exit 1002010

    echo "Install libtool cleaning script"
    if [[ $(cat "${SLFSB}") -lt 1002020 ]]
    then
        if ! sudo make install-remove-libtool
        then
            echo "Copy failed"
            exit 1
        else
            echo "1002020" > "${SLFSB}"
        fi
    fi

    ask_for_exit 1002020
    echo "Chapter 3. After LFS Configuration Issues "
    echo "The Bash Shell Startup Files"
    if [[ $(cat "${SLFSB}") -lt 1003010 ]]
    then
        if ! sudo make install-profile
        then
            echo "Copy failed"
            exit 1
        else
            echo "1003010" > "${SLFSB}"
        fi
    fi

    ask_for_exit 1003060
    echo " The /etc/vimrc and ~/.vimrc Files "
    if [[ $(cat "${SLFSB}") -lt 1003100 ]]
    then
        if ! sudo make install-profile
        then
            echo "Copy failed"
            exit 1
        else
            echo "1003100" > "${SLFSB}"
        fi
    fi

    ask_for_exit 1003100
    echo "Chapter 4. Security"
    if [[ $(cat "${SLFSB}") -lt 1003030 ]]
    then
        if ! sudo make install-profile
        then
            echo "Copy failed"
            exit 1
        else
            echo "1003030" > "${SLFSB}"
        fi
    fi

    ask_for_exit 1003040
    echo "Chapter 3. After LFS Configuration Issues "
    echo "The Bash Shell Startup Files"
    if [[ $(cat "${SLFSB}") -lt 1003040 ]]
    then
        if ! sudo make install-profile
        then
            echo "Copy failed"
            exit 1
        else
            echo "1003020" > "${SLFSB}"
        fi
    fi

    ask_for_exit 1003010
    echo "Chapter 3. After LFS Configuration Issues "
    echo "The Bash Shell Startup Files"
    if [[ $(cat "${SLFSB}") -lt 1003020 ]]
    then
        if ! sudo make install-profile
        then
            echo "Copy failed"
            exit 1
        else
            echo "1003020" > "${SLFSB}"
        fi
    fi

    ask_for_exit 1003010
    echo "Chapter 3. After LFS Configuration Issues "
    echo "The Bash Shell Startup Files"
    if [[ $(cat "${SLFSB}") -lt 1003020 ]]
    then
        if ! sudo make install-profile
        then
            echo "Copy failed"
            exit 1
        else
            echo "1003020" > "${SLFSB}"
        fi
    fi

}

if [[ "${BASH_SOURCE[0]}" == "$0" ]]; then
    main "$@"
fi