#!/bin/bash
# vim: tabstop=4 shiftwidth=4 softtabstop=4 expandtab

set -e

QUIET_MODE=0
[[ "$1" == "--quiet" ]] && QUIET_MODE=1

# Enter source directory
cd "$( dirname "$0" )" || exit

if [[ -d dist ]]; then
    echo "Clean previous build..."
    rm -fr dist
fi

CHECK_FILE="$( find "." -maxdepth 1 -name 'check_*' ! -name '*~' -type f -executable | head -n 1 )"
PACKAGE_NAME="$( basename "$CHECK_FILE" | tr '_' '-' )"

echo "Detect version using git describe..."
VERSION="$( git describe --tags|sed 's/^[^0-9]*//' )"

echo "Create building environemt..."
BDIR="dist/$PACKAGE_NAME-$VERSION"
mkdir -p "$BDIR"
RSYNC_ARGS=( )
[[ $QUIET_MODE -eq 0 ]] && RSYNC_ARGS+=( -v )
rsync -a "${RSYNC_ARGS[@]}" debian/ "$BDIR/debian/"
cp "$CHECK_FILE" "$BDIR/"

if [[ -e "README.md" ]]; then
    echo "Build manpage from README.md file..."
    MAN_TITLE=$( basename "$CHECK_FILE" )
    MAN_MD_FILE="$BDIR/$( basename "$CHECK_FILE" ).1.md"
    MAN_FILE="$BDIR/$( basename "$CHECK_FILE" ).1"
    echo "# ${MAN_TITLE^^} 1" \
        "$( git log --follow --format=%ad --date iso README.md | head -n 1 | awk '{print $1}')" \
        "$PACKAGE_NAME" \
        '"User Manuals"' > "$MAN_MD_FILE"
    sed 1d README.md >> "$MAN_MD_FILE"
    if ! which go-md2man > /dev/null; then
        ARG_ARGS=()
        [[ $QUIET_MODE -eq 0 ]] && ARG_ARGS+=( -qq )
        apt update "${ARG_ARGS[@]}"
        apt install -y "${ARG_ARGS[@]}" go-md2man
    fi
    go-md2man -in "$MAN_MD_FILE" -out "$MAN_FILE"
    basename "$MAN_FILE" >> "$BDIR/debian/manpages"
    grep -Eq '^Build-Depends: .*go-md2man' "$BDIR/debian/control" || \
        sed -i 's/^Build-Depends: \(.*\)$/Build-Depends: \1, go-md2man/' "$BDIR/debian/control"
fi

if grep -Eq '^VERSION *=' "$BDIR/$( basename "$CHECK_FILE" )"; then
    echo "Set VERSION=$VERSION in $( basename "$CHECK_FILE" ) using sed..."
    sed -i "s/^VERSION *=.*$/VERSION = '$VERSION'/" "$BDIR/$( basename "$CHECK_FILE" )"
elif grep -Eq '^# Version:' "$BDIR/$( basename "$CHECK_FILE" )"; then
    echo "Set Version = $VERSION in $( basename "$CHECK_FILE" ) using sed..."
    sed -i "s/^#\(\s*Version:\s*\).*$/#\1$VERSION/" "$BDIR/$( basename "$CHECK_FILE" )"
fi

if grep -Eq '^# Date:' "$BDIR/$( basename "$CHECK_FILE" )"; then
    DATE="$( git log --follow --format=%ad --date iso "$CHECK_FILE" | head -n 1 )"
    echo "Set Date = $DATE in $( basename "$CHECK_FILE" ) using sed..."
    sed -i "s/^#\(\s*Date:\s*\).*$/#\1$DATE/" "$BDIR/$( basename "$CHECK_FILE" )"
fi

if [[ -z "$DEBIAN_CODENAME" ]]; then
    echo "Retrieve debian codename using lsb_release..."
    DEBIAN_CODENAME=$( lsb_release -c -s )
else
    echo "Use debian codename from environment ($DEBIAN_CODENAME)"
fi

echo "Generate debian changelog using gitdch..."
GITDCH_ARGS=('--verbose')
[[ $QUIET_MODE -eq 1 ]] && GITDCH_ARGS=('--warning')
if [[ -n "$MAINTAINER_NAME" ]]; then
    echo "Use maintainer name from environment ($MAINTAINER_NAME)"
    GITDCH_ARGS+=("--maintainer-name" "${MAINTAINER_NAME}")
fi
if [[ -n "$MAINTAINER_EMAIL" ]]; then
    echo "Use maintainer email from environment ($MAINTAINER_EMAIL)"
    GITDCH_ARGS+=("--maintainer-email" "$MAINTAINER_EMAIL")
fi
gitdch \
    --package-name "$PACKAGE_NAME" \
    --version "${VERSION}" \
    --code-name "$DEBIAN_CODENAME" \
    --output "$BDIR"/debian/changelog \
    --release-notes dist/release_notes.md \
    "${GITDCH_ARGS[@]}"

if [[ -n "$MAINTAINER_NAME" ]] && [[ -n "$MAINTAINER_EMAIL" ]]; then
    echo "Set Maintainer field in debian control file ($MAINTAINER_NAME <$MAINTAINER_EMAIL>)..."
    sed -i "s/^Maintainer: .*$/Maintainer: $MAINTAINER_NAME <$MAINTAINER_EMAIL>/" \
        "$BDIR"/debian/control
fi

echo "Build debian package..."
cd "$BDIR" || exit
[[ $QUIET_MODE -eq 0 ]] && export DH_VERBOSE=1
dpkg-buildpackage