#!/bin/bash

set -eu

input=$1
parameters=$2
template=$3
output=$4

cp ${template} ${output}

transform-li-current-a ()
{
    local old="<li><a href=\"$1.html\">"
    local new="<li><a class=\"current\" href=\"$1.html\">"
    echo "s/${old}/${new}/"
}

transform-li-dropdown-current-a ()
{
    local old="<li class=\"dropdown\"><a href=\"$1.html\">"
    local new="<li class=\"dropdown\"><a class=\"current\" href=\"$1.html\">"
    echo "s/${old}/${new}/"
}

transforms=()
postprocess=true
iconcolor=
. ${parameters}

sed -i s/'{TITLE}'/"${title}"/ ${output}

link_stylesheets=''
for s in "${stylesheets[@]}"
do
    # Prefer relative paths so that drafts under /admin/drafts find
    # the correct stylesheets.
    # ${input} might be a temporary file; assume ${template} is a
    # bona-fide node in our directory hierarchy, and use that to
    # compute the path to the stylesheets folder.
    spath=$(realpath --relative-to $(dirname "${template}") stylesheets/"${s}".css)
    link_template='<link rel="stylesheet" href="%s">\n'
    link_stylesheets+=$(printf "${link_template}" "${spath}")
done

sed -i /'{STYLESHEETS}'/'c\'"${link_stylesheets}" ${output}

sed -i s/'{TRANSLATION}'/"${translation}"/ ${output}

for transform in "${transforms[@]}"
do
    sed -i "${transform}" ${output}
done

if test "${iconcolor}"
then
    sed -i s/'{ICONCOLOR}'/"-${iconcolor}"/ ${output}
else
    sed -i s/'{ICONCOLOR}'// ${output}
fi

sed -i -e /'{MAIN}'/"r ${input}" -e /'{MAIN}'/'c\' ${output}

${postprocess} ${output}