#!/bin/bash

VERBOSE=${VERBOSE:-0}

IN=in.png
OUT=out.png
OUT_BMP=out.bmp

error() {
    echo "$*" >&2
    exit 1
}

verbose() {
    if [ $VERBOSE != 0 ]; then
        "$@"
    fi
}

# under Windows we don't need to run test under Wine
WINE=wine
MAGICK=
if [ "x`uname -s`" != xLinux ]; then
    WINE=
    if command -V magick.exe &> /dev/null; then
        MAGICK=magick.exe
    fi
fi

# MSVC build put executables under <Configuration> directory
IMAGETEST=imagetest.exe
if [ -e ./Release/imagetest.exe ]; then
    IMAGETEST=./Release/imagetest.exe
fi

compare_images() {
    DIFF=$($MAGICK compare -metric AE $1 $2 - 2>&1 > /dev/null || true)
    if [ "$DIFF" != "0" ]; then
        error "Images $1 and $2 are too different, diff $DIFF"
    fi
}

do_test() {
    echo "Running image $IMAGE with '$*'..."
    $MAGICK convert $IMAGE "$@" $IN
    $WINE $IMAGETEST $IN $OUT_BMP $OUT
    verbose ls -lh $IN
    verbose $MAGICK identify $IN
    verbose $MAGICK identify $OUT_BMP
    compare_images $IN $OUT
    compare_images $IN $OUT_BMP
    rm -f $IN $OUT $OUT_BMP
}

do_test_all() {
    IMAGE="$1"
    do_test
    do_test -type Palette
    do_test -type Palette -colors 14
    do_test -type Palette -colors 3
    do_test -type TrueColor
    do_test -type Grayscale -depth 8
    do_test -type Grayscale -depth 2
    do_test -type Grayscale -depth 4
}

set -e
# test with small image
do_test_all rose:
# test with larger image
do_test_all logo:
rm -f $IN $OUT $OUT_BMP

verbose echo Finish