#!/usr/bin/env bash

validate_sas_script() {
    local scriptPath="$1"

    [[ -s "$scriptPath" ]] && python3 -c \
        'import ast, pathlib, sys; ast.parse(pathlib.Path(sys.argv[1]).read_text(encoding="utf-8"))' \
        "$scriptPath" 2> /dev/null
}

start_installed_sas() {
    local installedSas="$1"
    local warning="$2"

    if [[ -x "$installedSas" ]] && validate_sas_script "$installedSas"; then
        msgbox "$warning Starting the installed version instead."
        "$installedSas"
        return $?
    fi

    msgbox "$warning No working copy of the Stormux Assistance Service is installed."
    return 1
}

run_stormux_assistance_service() {
    local installedSas="/usr/local/bin/sas"
    local repositoryUrl="https://git.stormux.org/storm/sas"
    local tempDir
    local repositoryDir=""
    local latestSas
    local stagedSas="/usr/local/bin/.sas.new.$$"
    local attempt

    if ! command -v ii &> /dev/null; then
        infobox "Installing the ii IRC client required by the Stormux Assistance Service..."
        install_package ii
        if ! command -v ii &> /dev/null; then
            msgbox "The ii IRC client could not be installed. The Stormux Assistance Service cannot start."
            return 1
        fi
    fi

    tempDir=$(mktemp -d /tmp/configure-stormux-sas.XXXXXX) || {
        start_installed_sas "$installedSas" \
            "A temporary directory could not be created to check for an update."
        return $?
    }

    infobox "Checking for the latest Stormux Assistance Service..."
    for attempt in 1 2 3; do
        if GIT_TERMINAL_PROMPT=0 timeout 30s git clone --quiet --depth 1 \
            "$repositoryUrl" "$tempDir/repository-$attempt"; then
            repositoryDir="$tempDir/repository-$attempt"
            break
        fi
    done

    if [[ -z "$repositoryDir" ]]; then
        rm -rf -- "$tempDir"
        start_installed_sas "$installedSas" \
            "The latest Stormux Assistance Service could not be downloaded."
        return $?
    fi

    latestSas="$repositoryDir/sas.py"
    if ! validate_sas_script "$latestSas"; then
        rm -rf -- "$tempDir"
        start_installed_sas "$installedSas" \
            "The downloaded Stormux Assistance Service failed validation."
        return $?
    fi

    if [[ ! -x "$installedSas" ]] || ! cmp -s "$latestSas" "$installedSas"; then
        # sudoFlags is initialized by configure-stormux.sh before this file is sourced.
        # shellcheck disable=SC2154
        if ! sudo "${sudoFlags[@]}" install -m 0755 "$latestSas" "$stagedSas" ||
            ! sudo "${sudoFlags[@]}" mv -f "$stagedSas" "$installedSas"; then
            sudo "${sudoFlags[@]}" rm -f "$stagedSas"
            rm -rf -- "$tempDir"
            start_installed_sas "$installedSas" \
                "The Stormux Assistance Service could not be updated."
            return $?
        fi
    fi

    rm -rf -- "$tempDir"
    "$installedSas"
}

run_stormux_assistance_service