#!/bin/bash

# genrate localized help.html based on markdown help.md

HELPMD="help.md"
HELPMD=$(find {.,{.,..,../..}/help}/${HELPMD}  -type f -name ${HELPMD} -print -quit 2>/dev/null)
BASEDIR=$(realpath --relative-to=. $(dirname $HELPMD))
TXDIR=$(realpath --relative-to=. ${BASEDIR}/../i18n)
POTLIB="pot-gettext"

if [ -r "${TXDIR}/${POTLIB}" ]; then
	source "${TXDIR}/${POTLIB}"
else
	echo "Error: POTLIB $POTLIB no found"
	exit 1
fi

[ -n "$BASEDIR" ] && [ -d "$BASEDIR" ] || exit
[ -n "$TEMPMO"  ] && [ -d "$TEMPMO"  ] || exit
[ -n "$PODIR"   ] && [ -d "$PODIR"   ] || exit
[ -n "$HELPMD"  ] && [ -f "$HELPMD"  ] || exit

IMG_DIR_NAME="img"
IMG_DIR="$BASEDIR/$IMG_DIR_NAME"

HELP_NAME="help"
HTML_NAME="help.html"

export BAD_CHARS="<>"

HEAD_TITLE=$METATITLE


BASENAME=$(basename "$BASEDIR")
HELP_DIR="$BASEDIR/$HELP_NAME"
[ -d "$HELP_DIR" ] || mkdir "$HELP_DIR"

POLANG=($( ls "$PODIR"/*.po 2>/dev/null))
POLANG=(${POLANG[@]##*/})
POLANG=(${POLANG[@]%.po})

ltr_code() {
    [  "${1-x}" ] && echo 'ltr' && return
    declare -A rtl=(
        ar      Arabic
        arc     Aramaic
        dv      Divehi
        fa      Persian
        ha      Hausa
        he      Hebrew
        khw     Khowar
        ks      Kashmiri
        ku      Kurdish
        ps      Pashto
        ur      Urdu
        yi      Yiddish
        )
    [ "${A[$1]+x}" ] && echo 'rtl' || echo 'ltr'
}


for lang in "en" "${POLANG[@]}"; do
    if [ "$lang" = "en" ]; then
        HREF=""
        HTML_LANG="en-US"
        HTML_LTR="ltr"
        HTML_FILE="$BASEDIR/${HTML_NAME}"
        echo $(realpath --relative-to . "$HTML_FILE")
    else
        [ -d "${HELP_DIR}/$lang" ] || mkdir "${HELP_DIR}/$lang"
        HREF="../../"
        HTML_LANG="${lang//_/-}"
        HTML_LTR=$(ltr_code ${lang%%_*})
        HTML_FILE="${HELP_DIR}/$lang/${HTML_NAME}"
        echo $(realpath --relative-to . "$HTML_FILE")

        PO="$PODIR"/$lang.po
        [ -e $PO ] || continue
        [ -d $TEMPMO/$lang ]  || mkdir $TEMPMO/$lang
        ln -s . $TEMPMO/$lang/LC_MESSAGES
        MO=$TEMPMO/$lang/$TEXTDOMAIN.mo
        msgfmt -o $MO $PO
    fi

    TX_MARKDOWN=$(
    bash -c "unset LC_ALL
        export LANGUAGE=$lang
        export TEXTDOMAIN=${TEXTDOMAIN}
        export TEXTDOMAINDIR=${TEXTDOMAINDIR}
        ${GETTEXT}" |
        sed -e "
            /^#[[:space:]]*TRANSLATOR/,/^[^#]/{ /^#/d; };
            s/@VERSION@/${PKGVERS}/;
            s/@DATE@/${PKGDATE}/;
            "
        )

    cat <<EOF | sed 's/^[[:space:]]*//' > "$HTML_FILE"
    <!DOCTYPE html>
    <html lang="${HTML_LANG}" dir="${HTML_LTR}">
    <head>
    <meta charset="utf-8" />
    <base href="${HREF}">
    <title>$(unset LC_ALL; export LANGUAGE=$lang; gettext "${HEAD_TITLE}" | tr -d "$BAD_CHARS")</title>
    </head>
    <body>
EOF

    for img in $(grep -oP '(?<=[(]img/).*.(png|jpg)(?=[)])' < help.md); do  
        if [ -f "$IMG_DIR/$lang/$img" ]; then
            TX_MARKDOWN=$(sed "s:img/$img:img/$lang/$img:" <<<$TX_MARKDOWN )
        elif [ -f "$IMG_DIR/${lang%%_*}/$img" ]; then
            TX_MARKDOWN=$(sed "s:img/$img:img/${lang%%_*}/$img:" <<<$TX_MARKDOWN)
        fi
    done
       
    python3 -m markdown <<<$TX_MARKDOWN >> "$HTML_FILE"

    cat <<EOF | sed 's/^[[:space:]]*//' >> "$HTML_FILE"

    </body>
    </html>
EOF

done

[ -n "$TEMPMO" ] && [ -d "$TEMPMO" ] && rm -r "$TEMPMO"
