#!/usr/bin/env bash
# ------------------------------------------------------------------------------
# Copyright (c) 2013-2022 Geoffray Levasseur <fatalerrors@geoffray-levasseur.org>
# Protected by the BSD3 license. Please read bellow for details.
#
# * Redistribution and use in source and binary forms,
# * with or without modification, are permitted provided
# * that the following conditions are met:
# *
# *   Redistributions of source code must retain the above
# *   copyright notice, this list of conditions and the
# *   following disclaimer.
# *
# *   Redistributions in binary form must reproduce the above
# *   copyright notice, this list of conditions and the following
# *   disclaimer in the documentation and/or other materials
# *   provided with the distribution.
# *
# *   Neither the name of the copyright holder nor the names
# *   of any other contributors may be used to endorse or
# *   promote products derived from this software without
# *   specific prior written permission.
# *
# * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
# * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
# * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
# * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
# * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
# * OF SUCH DAMAGE.
# ------------------------------------------------------------------------------

export BASE_URL="https://git.geoffray-levasseur.org/fatalerrors/profile"
export UPDT_URL="$BASE_URL/raw/branch/master"
export ARCH_URL="$BASE_URL/archive/master.tar.gz"

# ------------------------------------------------------------------------------
# Check for profile updates
# ------------------------------------------------------------------------------
check_updates()
{
    if [[ $1 == "-q" ]]; then
        # Quiet mode is mostly used internally when profile_upgrade is called
        quiet=1
    fi
    disp I "Checking for updates..."
    local vfile="/tmp/version"
    wget "$UPDT_URL/version" -O $vfile >/dev/null 2>&1 || {
        disp E "Can't download version file, impossible to proceed!"
        return 5
    }

    if [[ -s $vfile ]]; then
        local lastver=$(cat $vfile)
        if [[ $lastver != $PROFVERSION ]]; then
            disp I "You have version $PROFVERSION installed. Version $lastver is available."
            [[ $quiet ]] && disp I "You should upgrade to last version when possible."
            result=1
        else
            disp I "Your version is up-to-date."
            result=0
        fi
        rm -f $vfile
    else
        disp E "Impossible to read temporary file, impossible to proceed."
    fi
    unset lastver vfile
    return $result
}

# ------------------------------------------------------------------------------
# Apply update to profile
# ------------------------------------------------------------------------------
profile_upgrade()
{
    check_updates -q
    local need_update=$?
    [[ $need_update -ne 1 ]] && {
        disp "No update available."
        return 0
    }

    if [[ -s $MYPATH/profile.sh ]]; then
        disp E "Installation path detection failed, cannot upgrade automatically."
        return 1
    fi

    if [[ -d $MYPATH/.git ]]; then
        disp I "Git installation detected, applying git pull."
        local curdir=$(pwd)
        cd $MYPATH
        git pull || {
            disp E "Git pull failed, upgrade not applyed."
            cd "$curdir"
            return 2
        }
        disp I "Successfully upgraded using git."
        cd "$curdir"
    else
        disp I "No Git detected. Downloading and applying upgrade from archive..."
        local tmpdir="/tmp/profile_upg.$$"
        mkdir -p "$tmpdir" || {
            disp E "Failed to create temporary directory."
            return 4
        }

        local archive="$tmpdir/profile.tar.gz"
        wget -q "$ARCH_URL" -O "$archive" || {
            disp E "Failed to download archive."
            rm -rf "$tmpdir"
            return 5
        }

        tar -xzf "$archive" -C "$tmpdir" || {
            disp E "Archive extraction failed."
            rm -rf "$tmpdir"
            return 6
        }

        disp I "Installing new version..."
        cp -r "$tmpdir"/profile/* "$MYPATH"/ || {
            disp E "Failed to copy new files to $MYPATH."
            rm -rf "$tmpdir"
            return 7
        }

        disp I "Upgrade complete. You should now logout and login again."
        rm -rf "$tmpdir"
    fi
}
# EOF