#!/bin/sh

set -e

# get frames path from cli args
framespath=${1:-}
[ -z "$framespath" ] && echo "no framespath provided" && exit 1

# draw random pic
mkdir -p test
imageName=$(find "$framespath" -type f | sort -R | tail -1)
shavedName="test/"$(basename "$imageName")

echo "working with $imageName"

# detect image border:
increment=5
x=150
limitX=400
y=50
colorFuzz=.04
borderColor="#f7d9ac"

while true
do
    pixelColor=$(magick convert "$imageName" -crop 1x1+$x+$y -depth 8 txt:- | awk ' NR==2 {print $3}')
    colorDiff=$(magick compare -metric RMSE xc:"$borderColor" xc:"$pixelColor" null: 2>&1 | sed "s/.*(\(.*\))/\1/")
    # break condition success
    echo "fuzz: $colorFuzz; diff: $colorDiff; point: $x:$y"
    [ 1 -eq "$(echo "$colorFuzz > $colorDiff" | bc)" ] && echo "found border: $x:$y" \
        && magick convert "$imageName" -colorspace Gray -shave "${x}x0" "$shavedName" \
        && break
    # break condition fail
    [ "$x" -gt "$limitX" ] && echo "failed to find border" && break
    # update point
    x=$((x+increment))
done

# generate bunch of cut and gray images
# two param types: scale and bottom crop
scaleX=400
scaleInc=20
bottomCrop=10
bottomInc=10

# both limits are reached in 20 runs
loopRunLimit=20
loop=0

# first change only scale
# then only bottomCrop
# then both
while true
do
    # break condition
    [ "$loop" -gt "$loopRunLimit" ] && break
    resizeName="test/${shavedName}_${scaleX}_0.png"
    chopName="test/${shavedName}_0_${bottomCrop}.png"
    resizeChopName="test/${shavedName}_${scaleX}_${bottomCrop}.png"
    magick convert "$shavedName" -adaptive-resize ${scaleX}x "$resizeName"
    magick convert "$shavedName" -gravity South -chop 0x${bottomCrop} "$chopName"
    magick convert "$shavedName" -gravity South -chop 0x${bottomCrop} -adaptive-resize ${scaleX}x "$resizeChopName"
    scaleX=$((scaleX+scaleInc))
    bottomCrop=$((bottomCrop+bottomInc))
    loop=$((loop+1))
done


# convert every new image to text
mkdir -p test_text
for img in test/*
do
    outName=$(basename "$img")
    tesseract -l deu "$img" "test_text/$outName"
done

# quality check text files
for t in test_text/*
do
    ./quality_check.py "$t" >> quality_out
done