#!/bin/bash
#
# Update samples before push
#

GREEN='\033[0;32m'
RED='\033[0;31m'
CYAN='\033[0;36m'
RESET='\033[0m'

echo -e "${CYAN}############################# UPDATE SAMPLES #############################${RESET}"

workingDir=$(pwd)

cd build

write_sample() {
    echo -e "\`\`\`tex" >> samples.md
    cat __tmp >> samples.md
    echo -e "\`\`\`" >> samples.md
    cp /dev/null __tmp
    echo -e "\n![sample_$1](samples/sample_$1.svg)\n\n" >> samples.md
}

update_samples() {
    # regenerate sample_*.svg
    if [ -d samples ]; then
        rm -r samples
    fi
    mkdir samples
    ./LaTeX -headless \
        -outputdir=./samples \
        -prefix=sample_ \
        -textsize=14 \
        -foreground=black \
        -background=white
    # regenerate samples.md
    if [ -e samples.md ]; then
        rm samples.md
    fi
    touch samples.md
    echo -e "# SAMPLES\n" >> samples.md
    touch __tmp
    cp /dev/null __tmp
    j=0
    while IFS='' read -r i || [[ -n "$i" ]]; do
        if [[ $i == +(['%']) ]]; then
            write_sample $j
            j=`expr $j + 1`
        elif [ -n "$i" ]; then
            echo "$i" >> __tmp
        fi
    done < res/SAMPLES.tex
    # the last sample
    write_sample $j

    rm __tmp
}

update_change() {
    if [ ! -d ../readme/samples ]; then
        mkdir ../readme/samples
    fi
    # compress svg files
    for svg in `ls samples`; do
        scour -i `pwd`/samples/$svg -o ../readme/samples/$svg \
            --enable-viewboxing --enable-id-stripping \
            --enable-comment-stripping --shorten-ids --indent=none
    done
    cp samples.md ../readme
    # check if samples changed
    git add ../readme/samples.md
    git add ../readme/samples
    git diff --cached --exit-code ../readme/samples > /dev/null
    samplesChanged=$?
    git diff --cached --exit-code ../readme/samples.md > /dev/null
    mdChanged=$?
    if [ $samplesChanged != 0 -o $mdChanged != 0 ]; then
        echo -e "${RED}Samples changed, commit changes...${RESET}"
        git commit -m "update samples"
    else
        echo -e "${GREEN}No changes need to commit.${RESET}"
    fi
}

# Allows us to read user input below, assigns stdin to keyboard,
# since git hooks not run in an interactive environment
exec < /dev/tty

while true; do
    read -p "Do you wish to update samples (Y/N)?" yn
    case $yn in
        [Yy]* ) update_samples; update_change; break;;
        * ) echo -e "${RED}Samples updating canceled.${RESET}"; break;;
    esac
done

# Close STDIN
exec <&-

cd $workingDir

echo -e "${CYAN}################################## DONE ##################################${RESET}"