#!/bin/bash

. "$(shellfu-get path)" || exit 3

shellfu import pretty

IMAPDOMO_CFGDIR="__IMAPDOMO_CONFIG_USER__"
IMAPDOMO_USER_CACHE="__IMAPDOMO_USER_CACHE__"


usage() {
    mkusage "[options] ACTION" \
        -o                                                                    \
            "-c DIR      change to DIR before doing anything"                 \
            "-d          turn on debugging mode"                              \
       --                                                                     \
       "imapdomo will try to read .imapdomo/host/HOSTNAME/init.lua and"       \
       ".imapdomo/host/HOSTNAME/handlers/ACTION.lua, where HOSTNAME is your"  \
       "short hostname (eg. 'foo' in 'foo.example.com')."                     \
       ""                                                                     \
       "four valid actions are understood; since you must write handler for"  \
       "each action you want to use, the meanings below are purely a guide:"  \
       ""                                                                     \
       "    newmail - check for and file new mail"                            \
       "    rewind  - re-add messages from FILTER_FAIL back to FILTER_QUEUE"  \
       "    cleanup - delete or archive old messages"                         \
       "    migrate - move mail between mailboxes"                            \
       ""                                                                     \
       "See imapfilter_config(5)) for guide and API reference.  Few functions"\
       "are also available in .imapdomo/common.lua"
}

mkcmd() {
    #
    # Compose imapfilter command
    #
    echo -n "IMAPDOMO_ACTION=$Action"
    echo -n "  IMAPDOMO_HEADERS=$HeaderDir"
    echo -n "  IMAPFILTER_HOME=$CfgDir"
    echo -n "  imapfilter"
    if $Debug
    then
        mkdir -p "$LogDir"
        echo -n "  -d $LogDir/debug.log"
        echo -n "  -v"
    fi
    echo -n "  -c $CfgDir/main.lua"
}

main() {
    local Action    # what to do
    local Debug     # true if debugging
    local cmd       # imapfilter command
    local CfgDir    # config directory
    local LogDir    # directory to store logs
    local HeaderDir # directory to store headers by save_header()
    local CdTo      # change dir to this before running imapfilter
    CfgDir="$IMAPDOMO_CFGDIR"
    LogDir="$IMAPDOMO_USER_CACHE/logs"
    HeaderDir="$IMAPDOMO_USER_CACHE/headers"
    Debug=false
    #shellcheck disable=SC2034
    while true; do case $1 in
        -c) CdTo="$2"; shift 2 || usage ;;
        -d) Debug=true; PRETTY_DEBUG=true; shift ;;
        -*) usage ;;
        *)  break ;;
    esac done
    Action="$1"; shift
    grep -qw "$Action" <<< "newmail|rewind|cleanup|migrate" || usage
    cmd=$(mkcmd)
    debug -v cmd
    bash -n <<<"$cmd" || die
    if test -n "$CdTo";
    then
        cd "$CdTo" || die
    fi
    mkdir -p "$HeaderDir" || die
    eval "$cmd"
}

main "$@"