#!/bin/bash
set -euo pipefail
shopt -s nullglob

HELP="Builds csb sites

Usage: 
    $(basename ${0}) [options]
    $(basename ${0}) (-h|--help)

Options:
  -h, --help                  Show this message and exit
  -s DIR, --source DIR        Directory to read files relative to [default: .]
  -d DIR, --destination DIR   Directory to write files relative to [default: ./public]"

TOOLS=(csb-config csb-index csb-tree csb-git csb-json jq realpath)

for tool in ${TOOLS[@]} ; do
    if ! which $tool >/dev/null 2>&1 ; then
        echo "ERROR: \`$tool\` not in path" >&2
        exit 2
    fi
done

ARGS=$(echo "$HELP" | csb-optparse "$@")
trap "rm -rf $ARGS" EXIT

[[ $(< "${ARGS}/--help") == "true" ]] && echo "$HELP" && exit 0

SOURCE="$(<$ARGS/--source)"
TARGET="$(<$ARGS/--destination)"

build_single() {
    local sourcedir="$1"
    local destdir="$2"
    local templatedir="$3"

    local name=$(basename "$sourcedir")
    local stype=$(csb-config get type "${sourcedir}")
    local sloc=$(csb-config get source "${sourcedir}")

    csb-"${stype}" "${name}" "${sloc}" -o "${destdir}" -t "${templatedir}"
    csb-index "${sourcedir}/index.md" "${destdir}/${name}/index.html" "${templatedir}/project.tmpl" --name="$name"
}

build_multi() {
    local sourcedir=$1
    local destdir=$2
    local templatedir=$3

    local index
    local contentdir
    local staticdir
    : "${contentdir:=$(csb-config get content 2>/dev/null || true)}" "${contentdir:=content}"
    : "${index:=$(csb-config get index 2>/dev/null || true)}" "${index:=$contentdir/index.md}"
    : "${staticdir:=$(csb-config get static 2>/dev/null || true)}" "${staticdir:=static}"
    index="${sourcedir}/${index}"
    contentdir="${sourcedir}/${contentdir}"
    staticdir="${sourcedir}/${staticdir}"

    cp -r "${staticdir}/." "${destdir}" 2>/dev/null || true

    local tempdir="${PWD}/tmp"
    mkdir -p "$tempdir"

    local projects=()
    local n

    for p in "${contentdir}"/*/ ; do
        n=$(basename "$p")
        build "$p" "$destdir" "$templatedir"
        projects+=("${n}")
    done

    printf '%s\n' ${projects[@]+"${projects[@]}"} \
        | jq --raw-input --slurp 'split("\n") | map(select(length>0))' \
        | csb-json --template "${templatedir}/projlist.tmpl" \
        > "${tempdir}/projlist.html"

    csb-index "${index}" "${destdir}/index.html" "${templatedir}/frontindex.tmpl" --include "${tempdir}"

    rm -rf "${tempdir}"
}

build() {
    local sourcedir="${1:-${SOURCE}}"
    local destdir="${2:-${TARGET}}"
    local templatedir="${3:-${TEMPLATEDIR}}"

    mkdir -p "${destdir}"

    local sitetype
    : "${sitetype:=$(csb-config get type ${sourcedir} 2>/dev/null || true)}" "${sitetype:=multi}"

    if [ "$sitetype" == "multi" ]; then
        destdir=$(realpath -m ${TARGET}/$(realpath -m --relative-base=$SOURCE $sourcedir))
        mkdir -p "$destdir"
        build_multi "$sourcedir" "$destdir" "$templatedir"
    else
        build_single "$sourcedir" "$destdir" "$templatedir"
    fi
}

: "${SITETYPE:=$(csb-config get type 2>/dev/null || true)}" "${SITETYPE:=multi}"
: "${TEMPLATEDIR:=$(csb-config get templatedir 2>/dev/null || true)}" "${TEMPLATEDIR:=templates}"
TEMPLATEDIR="${SOURCE}/${TEMPLATEDIR}"

build