#!/bin/bash
#
# RaspAP Quick Installer - Installs and updates RaspAP
# Author: @billz <billzimmerman@gmail.com>
# Author URI: https://github.com/billz
# Project URI: https://github.com/RaspAP/
# License: GNU General Public License v3.0
# License URI: https://github.com/RaspAP/raspap-webgui/blob/master/LICENSE
#
# Usage: raspbian.sh [options]
#
# See below for options and usage examples.
#
#                    GNU GENERAL PUBLIC LICENSE
# This program is free software: you may copy, redistribute and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, under version 3 of the License. You are not
# obligated to bundle the LICENSE file with your RaspAP projects as long as
# you leave these references intact in the header comments of your source files.
#
# NOTE
# Depending on options passed to the installer, ONE of the following
# additional shell scripts will be downloaded and sourced:
#
# https://raw.githubusercontent.com/raspap/raspap-webgui/master/installers/common.sh
# - or -
# https://raw.githubusercontent.com/raspap/raspap-webgui/master/installers/mkcert.sh
# - or -
# https://raw.githubusercontent.com/raspap/raspap-webgui/master/installers/minwrite.sh
# - or -
# https://raw.githubusercontent.com/raspap/raspap-webgui/master/installers/uninstall.sh

function _usage() {
    cat << EOF
Usage: raspbian.sh [options]

Installs an instance of RaspAP or a helper component.

OPTIONS:
-y, --yes, --assume-yes             Assumes "yes" as an answer to all prompts
-c, --cert, --certificate           Installs an SSL certificate for lighttpd
-o, --openvpn <flag>                Used with -y, --yes, sets OpenVPN install option (0=no install)
-s, --rest, --restapi <flag>        Used with -y, --yes, sets RestAPI install option (0=no install)
-a, --adblock <flag>                Used with -y, --yes, sets Adblock install option (0=no install)
-w, --wireguard <flag>              Used with -y, --yes, sets WireGuard install option (0=no install)
-e, --provider <value>              Used with -y, --yes, sets the VPN provider install option
-g, --tcp-bbr <value>               Used with -y, --yes, sets the TCP BBR congestion control algorithm option
-r, --repo, --repository <name>     Overrides the default GitHub repo (RaspAP/raspap-webgui)
-b, --branch <name>                 Overrides the default git branch (latest release)
-t, --token <accesstoken>           Specify a GitHub token to access a private repository
-n, --name <username>               Specify a GitHub username to access a private repository
-u, --upgrade                       Upgrades an existing installation to the latest release version
-d, --update                        Updates an existing installation to the latest release version
-p, --path <path>                   Used with -d, --update, sets the existing install path
-i, --insiders                      Installs from the Insiders Edition (RaspAP/raspap-insiders)
-m, --minwrite                      Configures a microSD card for minimum write operation
-k, --check <flag>                  Sets the connectivity check flag (default is 1=perform check)
-v, --version                       Outputs release info and exits
-n, --uninstall                     Loads and executes the uninstaller
-h, --help                          Outputs usage notes and exits

Examples:
    Run locally specifying GitHub repo and branch:
    raspbian.sh --repo foo/bar --branch my/branch

    Run locally requesting release info:
    raspbian.sh --version

    Invoke installer remotely, run non-interactively with option flags:
    curl -sL https://install.raspap.com | bash -s -- --yes --wireguard 1 --adblock 0

    Invoke remotely, uprgrade an existing install to the Insiders Edition:
    curl -sL https://install.raspap.com | bash -s -- --upgrade --insiders --name <name> --token <token>

    Invoke remotely, perform an unattended update to the latest release version:
    curl -sL https://install.raspap.com | bash -s -- --yes --update --path /var/www/html

EOF
    exit
}

set -eo pipefail

function _main() {
    # set defaults
    repo="RaspAP/raspap-webgui" # override with -r, --repo option
    repo_common="$repo"

    _parse_params "$@"
    _setup_colors
    if [ "${check}" == 1 ]; then
        _check_internet
    fi

    _log_output
    _load_installer
}

function _parse_params() {
    # default option values
    assume_yes=0
    upgrade=0
    update=0
    ovpn_option=1
    restapi_option=1
    adblock_option=1
    wg_option=1
    insiders=0
    minwrite=0
    acctoken=""
    path=""
    check=1

    while :; do
        case "${1-}" in
            -y|--yes|--assume-yes)
            assume_yes=1
            apt_option="-y"
            ;;
            -o|--openvpn)
            ovpn_option="$2"
            shift
            ;;
            -s|--rest|--restapi)
            restapi_option="$2"
            shift
            ;;
            -a|--adblock)
            adblock_option="$2"
            shift
            ;;
            -w|--wireguard)
            wg_option="$2"
            shift
            ;;
            -e|--provider)
            pv_option="$2"
            shift
            ;;
            -g|--tcp-bbr)
            bbr_option="$2"
            shift
            ;;
            -c|--cert|--certificate)
            install_cert=1
            ;;
            -r|--repo|--repository)
            repo="$2"
            repo_common="$repo"
            shift
            ;;
            -b|--branch)
            branch="$2"
            shift
            ;;
            -h|--help)
            _usage
            ;;
            -u|--upgrade)
            upgrade=1
            ;;
            -i|--insiders)
            insiders=1
            ;;
            -m|--minwrite)
            minwrite=1
            ;;
            -t|--token)
            acctoken="$2"
            shift
            ;;
            -n|--name)
            username="$2"
            shift
            ;;
            -d|--update)
            update=1
            ;;
            -p|--path)
            path="$2"
            shift
            ;;
            -k|--check)
            check="$2"
            shift
            ;;
            -v|--version)
            _version
            ;;
            -n|--uninstall)
            uninstall=1
            ;;
            -*|--*)
            echo "Unknown option: $1"
            _usage
            exit 1
            ;;
            *)
            break
            ;;
        esac
        shift
    done
}

function _setup_colors() {
    ANSI_RED="\033[0;31m"
    ANSI_AQUA="\033[38;5;44m"
    ANSI_YELLOW="\033[0;33m"
    ANSI_LT_AQUA="\033[38;5;30m"
    ANSI_ERROR="\033[1;37;41m"
    ANSI_RESET="\033[m"
}

function _log_output() {
    readonly LOGFILE_PATH="/tmp"
    if [ -f "$LOGFILE_PATH/raspap_install.log" ]; then
        sudo rm "$LOGFILE_PATH/raspap_install.log"
    fi
    exec > >(tee -i $LOGFILE_PATH/raspap_install.log)
    exec 2>&1
}

function _version() {
    _get_release
    echo -e "RaspAP v${RASPAP_RELEASE} - Simple wireless AP setup & management for Debian-based devices"
    exit
}

# Outputs a welcome message
function _display_welcome() {
    echo -e "${ANSI_AQUA}\n"
    echo -e " 888888ba                              .d888888   888888ba"
    echo -e " 88     8b                            d8     88   88     8b"
    echo -e "a88aaaa8P' .d8888b. .d8888b. 88d888b. 88aaaaa88a a88aaaa8P"
    echo -e " 88    8b. 88    88 Y8ooooo. 88    88 88     88   88"
    echo -e " 88     88 88.  .88       88 88.  .88 88     88   88"
    echo -e " dP     dP  88888P8  88888P  88Y888P  88     88   dP"
    echo -e "                             88"
    echo -e "                             dP      version ${RASPAP_RELEASE}"
    echo -e "${ANSI_LT_AQUA}"
    echo -e "The Quick Installer will guide you through a few easy steps${ANSI_RESET}\n\n"
}

# Fetch latest release from GitHub or RaspAP Installer API
function _get_release() {
    local response
    local host="api.github.com"
    response=$(curl -s "https://$host/repos/$repo/releases/latest")

    if echo "$response" | grep -q 'API rate limit exceeded'; then
        _install_status 1 "GitHub API rate limit exceeded. Try again later or use a GitHub token."
        return 1
    fi
    readonly RASPAP_LATEST=$(echo "$response" | grep -Po '"tag_name": "\K.*?(?=")')

    if [ -z "$RASPAP_LATEST" ]; then
        _install_status 1 "Failed to fetch latest release. Check network connectivity."
        return 1
    fi

    if [ "$insiders" == 1 ]; then
        repo="RaspAP/raspap-insiders"
        repo_common="RaspAP/raspap-webgui"
        readonly RASPAP_INSIDERS_LATEST=$(curl -s "https://api.raspap.com/repos/RaspAP/raspap-insiders/releases/latest/" | grep -Po '"tag_name": "\K.*?(?=")')
        readonly RASPAP_RELEASE="${RASPAP_INSIDERS_LATEST} Insiders"
    else
        readonly RASPAP_RELEASE="${RASPAP_LATEST}"
    fi
}

# Outputs a RaspAP Install log line
function _install_log() {
    echo -e "${ANSI_LT_AQUA}RaspAP ${component}: $1${ANSI_RESET}"
}

# Outputs a RaspAP divider
function _install_divider() {
    echo -e "\033[1;32m***************************************************************$*\033[m"
}

# Outputs a RaspAP status indicator
function _install_status() {
    case $1 in
        0)
        echo -e "[$ANSI_LT_AQUA \U2713 ok $ANSI_RESET] $2"
        ;;
        1)
        echo -e "[$ANSI_RED \U2718 error $ANSI_RESET] $ANSI_ERROR $2 $ANSI_RESET"
        ;;
        2)
        echo -e "[$ANSI_YELLOW \U26A0 warning $ANSI_RESET] $2"
        ;;
        3)
        echo -e "[$ANSI_AQUA ! important $ANSI_RESET] $2"
    esac
}

# Checks connectivity to github.com
function _check_internet() {
    component="Install"
    _install_log "Checking internet connectivity..."

    # spinner frames
    local spinner='⠋⠙⠹⠸⠼⠴⠦⠧⠇⠏'
    local i=0

    tput civis # hide cursor

    # run check in background
    (
      curl -Is --connect-timeout 3 --max-time 15 https://github.com \
        | grep -q "^HTTP/2 200"
    ) &
    local pid=$!

    # display spinner while curl runs
    while kill -0 $pid 2>/dev/null; do
        printf "\r%s" "${spinner:i++%${#spinner}:1}"
        sleep 0.05
    done
    printf "\r"

    # capture exit status
    wait "$pid"
    exit_code=$?

    tput cnorm # restore cursor

    if [[ $exit_code -ne 0 ]]; then
        _install_status 1 "No internet connection or unable to reach GitHub"
        exit 1
    fi
    _install_status 0
}

function _update_system_packages() {
    _install_log "Updating sources"
    sudo apt-get update || _install_status 1 "Unable to update package list"
}

# Fetch required installer functions
function _load_installer() {
    # fetch latest release tag
    _get_release

    # assign default branch if not defined with -b, --branch option
    if [ -z ${branch} ]; then
        branch=$RASPAP_LATEST
    fi
    UPDATE_URL="https://raw.githubusercontent.com/$repo_common/$branch/"

    if [ "${install_cert:-}" = 1 ]; then
        source="mkcert"
        component="mkcert"
        wget "${header[@]}" -q ${UPDATE_URL}installers/${source}.sh -O /tmp/raspap_${source}.sh
        source /tmp/raspap_${source}.sh && rm -f /tmp/raspap_${source}.sh
        _install_certificate || _install_status 1 "Unable to install certificate"
    elif [ "${minwrite}" = 1 ]; then
        source="minwrite"
        component="Minwrite"
        wget "${header[@]}" -q ${UPDATE_URL}installers/${source}.sh -O /tmp/raspap_${source}.sh
        source /tmp/raspap_${source}.sh && rm -f /tmp/raspap_${source}.sh
        _install_minwrite || _install_status 1 "Unable to execute minimal write install"
    elif [ "${uninstall}" = 1 ]; then
        source="uninstall"
        component="Uninstall"
        wget "${header[@]}" -q ${UPDATE_URL}installers/${source}.sh -O /tmp/raspap_${source}.sh
        source /tmp/raspap_${source}.sh && rm -f /tmp/raspap_${source}.sh
        _remove_raspap || _install_status 1 "Unable to uninstall RaspAP"
    else
        source="common"
        component="Install"
        wget "${header[@]}" -q ${UPDATE_URL}installers/${source}.sh -O /tmp/raspap_${source}.sh
        source /tmp/raspap_${source}.sh && rm -f /tmp/raspap_${source}.sh
        if [ "$update" == 1 ]; then
            _update_raspap || _install_status 1 "Unable to update RaspAP"
        else
            _install_raspap || _install_status 1 "Unable to install RaspAP"
        fi
    fi
}

_main "$@"

