#!/bin/bash

function die() {
    echo "ERROR! $1" && exit 1
}

START_DIR=$(pwd)
FILE_DIR="/opt/wezterm"
FILE_NAME="WezTerm-nightly-Ubuntu20.04.AppImage"
FILE_URL="https://github.com/wez/wezterm/releases/download/nightly"
TMP_FILE=$(mktemp $FILE_DIR/wezterm.XXXXXX.appimage)

echo "Downloading latest nightly $FILE_NAME to $TMP_FILE"
# curl -L -o $TMP_FILE $FILE_URL/$FILE_NAME || die "Can't cURL $FILE_NAME"
wget -O $TMP_FILE $FILE_URL/$FILE_NAME > /dev/null 2>&1 || die "Can't cURL $FILE_NAME"

chmod +x $TMP_FILE || die "Can't chmod $TMP_FILE"

NEWVER=$($TMP_FILE --version | head -1)
EXTVER=$(test -e $FILE_DIR/.version && cat $FILE_DIR/.version || echo "")
echo "Version check - New version ($NEWVER) =?= current ($EXTVER)"

if [ "$NEWVER" == "$EXTVER" ]; then
    echo "Not updating. New version ($NEWVER) same as current ($EXTVER)"
else
    if [ -e $FILE_NAME ]; then
        rm $FILE_NAME || die "Can't remove $FILE_NAME"
        echo "Removed $FILE_NAME"
    fi
    cp $TMP_FILE $FILE_DIR/$FILE_NAME || die "Can't copy $TMP_FILE to $FILE_NAME"

    echo "Making $FILE_DIR/$FILE_NAME executable"
    chmod +x $FILE_DIR/$FILE_NAME || die "Can't chmod $FILE_DIR/$FILE_NAME"

    echo $NEWVER > $FILE_DIR/.version || die "Can't write $FILE_DIR/.version"

    # Extract wezterm for other (non-root) users to run
    if [ -d "$FILE_DIR/squashfs-root" ]; then
        rm -rf $FILE_DIR/squashfs-root || die "Can't delete $FILE_DIR/squashfs-root"
    fi

    cd $FILE_DIR

    echo "Extracting $NEWVER"
    $TMP_FILE --appimage-extract > /dev/null 2>&1 || die "Can't extract appimage $FILE_NAME"
    if [ -L "$FILE_DIR/wezterm" ]; then
        rm $FILE_DIR/wezterm || die "Can't remove $FILE_DIR/wezterm"
    fi
    if [ -x "$FILE_DIR/squashfs-root/AppRun" ]; then
        ln -s $FILE_DIR/squashfs-root/AppRun wezterm
    else
        die "$FILE_DIR/squash-root/AppRun not executable"
    fi
    cd $START_DIR

    echo "Version $NEWVER ready!"
fi
rm $TMP_FILE || die "Can't delete $TMP_FILE"
echo "Done with Wezterm"