#!/bin/bash
#set -x
INPUT="$*"
OUTDIR=$(mktemp -d)
IMGDIR="$GITEA_WORK_DIR/custom/public/assets/img"

if [[ -d "$IMGDIR" && -w "$IMGDIR" ]]; then
    # We can use caching
    HASH=$(sha256sum "$INPUT" | cut -c1-64)

    shopt -s nullglob
    IMAGES=("${IMGDIR}"/${HASH}.*.svg)
    shopt -u nullglob

    if [ ${#IMAGES[@]} -le 0 ]; then
        libreoffice --headless --convert-to pdf --outdir "$OUTDIR" $INPUT >/dev/null

        PDF_FILE="$OUTDIR/$(basename "${INPUT%.*}".pdf)"

        NUM_PAGES=$(pdfinfo "$PDF_FILE" | grep Pages | awk '{print $2}')

        for (( i=1; i<=$NUM_PAGES; i++ )); do
            FN="${IMGDIR}/${HASH}.${i}.svg"
            pdftocairo -svg -f $i -l $i "$PDF_FILE" "${FN}"
        done

        shopt -s nullglob
        IMAGES=("${IMGDIR}"/${HASH}.*.svg)
        shopt -u nullglob
    fi

    echo '<div class="file">'
    for IMG in "${IMAGES[@]}"; do
        echo '<div class="page">'
        echo -n '<img src="/assets/img/'
        echo -n "$(basename "${IMG}")"
        echo -n '"'
        echo -n ' class="full_width libreoffice pan_zoom"'
        echo '/>'
        echo '</div>'
    done
    echo '</div>'

else
    # We'll be generating the images on the fly, including them as base64
    libreoffice --headless --convert-to pdf --outdir "$OUTDIR" $INPUT >/dev/null
    PDF_FILE="$OUTDIR/$(basename "${INPUT%.*}".pdf)"
    NUM_PAGES=$(pdfinfo "$PDF_FILE" | grep Pages | awk '{print $2}')

    for (( i=1; i<=$NUM_PAGES; i++ )); do
        FN="${IMGDIR}/${HASH}.${i}.svg"
        pdftocairo -svg -f $i -l $i "$PDF_FILE" "${FN}"
    done

    shopt -s nullglob
    IMAGES=("${IMGDIR}"/${HASH}.*.svg)
    shopt -u nullglob

    echo '<div class="file">'
    for IMG in "${IMAGES[@]}"; do
        echo '<div class="page">'
        echo -n '<img src="/assets/img/'
        base64 --wrap=0 < "${IMG}"
        echo -n '"'
        echo -n ' class="full_width libreoffice pan_zoom"'
        echo '/>'
        echo '</div>'
    done
    echo '</div>'
fi

rm -R "$OUTDIR"