#!/bin/sh
# postinst script for weewx debian package
# Copyright 2013 Matthew Wall
#
# ways this script might be invoked:
#
# postinst configure most-recently-configured-version
# old-postinst abort-upgrade new-version
# conflictor's-postinst abort-remove in-favour package new-version
# postinst abort-remove
# deconfigured's-postinst abort-deconfigure in-favour failed-install-package
#   version [removing conflicting-package version]

# abort if any command returns error
set -e

# get debconf stuff so we can set configuration defaults
. /usr/share/debconf/confmodule

cfgfile=/etc/weewx/weewx.conf
cfgapp=/usr/share/weewx/wee_config

# insert any configuration variables into the configuration file
insert_debconf_variables() {
    if [ ! -f $cfgfile ]; then
        return
    fi

    db_get weewx/location
    sed -i "/\[Station\]/,/\[.*\]/ s%location =.*%location = \"$RET\"%" $cfgfile

    db_get weewx/latlon
    lat=$(echo $RET | cut -d, -f1 | sed 's/^ //g' | sed 's/ $//g')
    lon=$(echo $RET | cut -d, -f2 | sed 's/^ //g' | sed 's/ $//g')
    sed -i "/\[Station\]/,/\[.*\]/ s%latitude[ ]*=.*%latitude = $lat%" $cfgfile
    sed -i "/\[Station\]/,/\[.*\]/ s%longitude[ ]*=.*%longitude = $lon%" $cfgfile

    db_get weewx/altitude
    a=$(echo $RET | cut -d, -f1 | sed 's/^ //g' | sed 's/ $//g')
    u=$(echo $RET | cut -d, -f2 | sed 's/^ //g' | sed 's/ $//g')
    sed -i "/\[Station\]/,/\[.*\]/ s%altitude[ ]*=.*%altitude = $a, $u%" $cfgfile

    # FIXME: generalize this so it does not have to be modified every time a
    #        new station type is added or new station options are added.
    db_get weewx/station_type
    if [ "$RET" != "" ]; then
        sed -i "s%station_type[ ]*=.*%station_type = $RET%" $cfgfile
        if [ "$RET" = "AcuRite" ]; then
            db_get weewx/acurite_model
            sed -i "/\[AcuRite\]/,/\[.*\]/ s%[# ]*model[ ]*=.*%    model = $RET%" $cfgfile
        fi
        if [ "$RET" = "CC3000" ]; then
            db_get weewx/cc3000_model
            sed -i "/\[CC3000\]/,/\[.*\]/ s%[# ]*model[ ]*=.*%    model = $RET%" $cfgfile
            db_get weewx/cc3000_port
            sed -i "/\[CC3000\]/,/\[.*\]/ s% port[ ]*=.*%    port = $RET%" $cfgfile
        fi
        if [ "$RET" = "FineOffsetUSB" ]; then
            db_get weewx/fousb_model
            sed -i "/\[FineOffsetUSB\]/,/\[.*\]/ s%[# ]*model[ ]*=.*%    model = $RET%" $cfgfile
        fi
        if [ "$RET" = "TE923" ]; then
            db_get weewx/te923_model
            sed -i "/\[TE923\]/,/\[.*\]/ s%[# ]*model[ ]*=.*%    model = $RET%" $cfgfile
        fi
        if [ "$RET" = "Ultimeter" ]; then
            db_get weewx/ultimeter_model
            sed -i "/\[Ultimeter\]/,/\[.*\]/ s%[# ]*model[ ]*=.*%    model = $RET%" $cfgfile
            db_get weewx/ultimeter_port
            sed -i "/\[Ultimeter\]/,/\[.*\]/ s% port[ ]*=.*%    port = $RET%" $cfgfile
        fi
        if [ "$RET" = "Vantage" ]; then
            db_get weewx/vantage_type
            sed -i "/\[Vantage\]/,/\[.*\]/ s% type[ ]*=.*%    type = $RET%" $cfgfile
            if [ "$RET" = "serial" ]; then
                db_get weewx/vantage_port
                sed -i "/\[Vantage\]/,/\[.*\]/ s% port[ ]*=.*%    port = $RET%" $cfgfile
            else
                db_get weewx/vantage_host
                sed -i "/\[Vantage\]/,/\[.*\]/ s% host[ ]*=.*%    host = $RET%" $cfgfile
            fi
        fi
        if [ "$RET" = "WMR100" ]; then
            db_get weewx/wmr100_model
            sed -i "/\[WMR100\]/,/\[.*\]/ s%[# ]*model[ ]*=.*%    model = $RET%" $cfgfile
        fi
        if [ "$RET" = "WMR200" ]; then
            db_get weewx/wmr200_model
            sed -i "/\[WMR200\]/,/\[.*\]/ s%[# ]*model[ ]*=.*%    model = $RET%" $cfgfile
        fi
        if [ "$RET" = "WMR300" ]; then
            db_get weewx/wmr300_model
            sed -i "/\[WMR300\]/,/\[.*\]/ s%[# ]*model[ ]*=.*%    model = $RET%" $cfgfile
        fi
        if [ "$RET" = "WMR9x8" ]; then
            db_get weewx/wmr9x8_model
            sed -i "/\[WMR9x8\]/,/\[.*\]/ s%[# ]*model[ ]*=.*%    model = $RET%" $cfgfile
            db_get weewx/wmr9x8_port
            sed -i "/\[WMR9x8\]/,/\[.*\]/ s% port[ ]*=.*%    port = $RET%" $cfgfile
        fi
        if [ "$RET" = "WS1" ]; then
            db_get weewx/ws1_port
            sed -i "/\[WS1\]/,/\[.*\]/ s% port[ ]*=.*%    port = $RET%" $cfgfile
        fi
        if [ "$RET" = "WS23xx" ]; then
            db_get weewx/ws23xx_model
            sed -i "/\[WS23xx\]/,/\[.*\]/ s%[# ]*model[ ]*=.*%    model = $RET%" $cfgfile
            db_get weewx/ws23xx_port
            sed -i "/\[WS23xx\]/,/\[.*\]/ s%[# ]*port[ ]*=.*%    port = $RET%" $cfgfile
        fi
        if [ "$RET" = "WS28xx" ]; then
            db_get weewx/ws28xx_model
            sed -i "/\[WS28xx\]/,/\[.*\]/ s%[# ]*model[ ]*=.*%    model = $RET%" $cfgfile
            db_get weewx/ws28xx_frequency
            sed -i "/\[WS28xx\]/,/\[.*\]/ s%[# ]*transceiver_frequency[ ]*=.*%    transceiver_frequency = $RET%" $cfgfile
        fi
    fi
}

install_weewxconf() {
    if [ ! -f $cfgfile ]; then
        return
    fi

    driver=weewx.drivers.simulator
    db_get weewx/station_type
    if [ "$RET" = "AcuRite" ]; then
        driver=weewx.drivers.acurite
    elif [ "$RET" = "CC3000" ]; then
        driver=weewx.drivers.cc3000
    elif [ "$RET" = "FineOffsetUSB" ]; then
        driver=weewx.drivers.fousb
    elif [ "$RET" = "TE923" ]; then
        driver=weewx.drivers.te923
    elif [ "$RET" = "Ultimeter" ]; then
        driver=weewx.drivers.ultimeter
    elif [ "$RET" = "Vantage" ]; then
        driver=weewx.drivers.vantage
    elif [ "$RET" = "WMR100" ]; then
        driver=weewx.drivers.wmr100
    elif [ "$RET" = "WMR200" ]; then
        driver=weewx.drivers.wmr200
    elif [ "$RET" = "WMR300" ]; then
        driver=weewx.drivers.wmr300
    elif [ "$RET" = "WMR9x8" ]; then
        driver=weewx.drivers.wmr9x8
    elif [ "$RET" = "WS1" ]; then
        driver=weewx.drivers.ws1
    elif [ "$RET" = "WS23xx" ]; then
        driver=weewx.drivers.ws23xx
    elif [ "$RET" = "WS28xx" ]; then
        driver=weewx.drivers.ws28xx
    fi

    units=us
    db_get weewx/units
    if [ "$RET" = "Metric" ]; then
        units=metric
    fi

    $cfgapp --install --dist-config=$cfgfile --output=$cfgfile --driver=$driver --units=$units --no-prompt --no-backup

    insert_debconf_variables
}

# use weewx setup utilities to merge new features into existing weewx.conf
merge_weewxconf() {
    if [ ! -f $cfgfile ]; then
        return
    fi

    NEWVER=`$cfgapp --version`
    OLDVER=$(get_conf_version $cfgfile)
    if dpkg --compare-versions $OLDVER lt $NEWVER; then
        # this is an old config, so merge it into a new config
        if [ -f $cfgfile.dist ]; then
            DSTVER=$(get_conf_version $cfgfile.dist)
            if dpkg --compare-versions $DSTVER eq $NEWVER; then
                echo saving previous config file as $cfgfile-$OLDVER
                mv $cfgfile $cfgfile-$OLDVER
                echo saving distribution config file as $cfgfile-$NEWVER
                cp -p $cfgfile.dist $cfgfile-$NEWVER
                echo merging previous and distribution into $cfgfile
                $cfgapp --upgrade --config=$cfgfile-$OLDVER --dist-config=$cfgfile-$NEWVER --output=$cfgfile --no-prompt --no-backup
            else
                echo distribution config file is wrong version for merging
            fi
        else
            echo no distribution config with which to merge
        fi
    else
        # this is a new config, so just insert debconf values into it
        echo using debconf configuration values from previous install
        install_weewxconf
    fi
}

# get the version number from the specified file, without the debian revisions
get_conf_version() {
    echo `grep version $1 | sed -e 's/\s*version\s*=\s*//' | sed -e 's/-.*//'`
}

case "$1" in
configure)
        if [ "$2" != "" ]; then
            # this is an upgrade so attempt to merge
            merge_weewxconf
        else
            # virgin install so insert debconf values into the config file
            install_weewxconf
        fi

        # precompile the bytecode
        #python -m compileall /usr/share/weewx

        # configure for system startup
        update-rc.d weewx defaults 98 > /dev/null

        # start the weewx daemon
        invoke-rc.d weewx start
        ;;

abort-remove)
        # precompile the bytecode
        #python -m compileall /usr/share/weewx
        ;;
esac

# let debconf know that we are finished
db_stop

exit 0