#!/bin/bash

# Install prerequisites
sudo apt update && sudo apt install -y cmake g++ wget unzip

# Install prerequisites for video
sudo apt install build-essential cmake git pkg-config libgtk-3-dev \
    libavcodec-dev libavformat-dev libswscale-dev libv4l-dev \
    libxvidcore-dev libx264-dev libjpeg-dev libpng-dev libtiff-dev \
    gfortran openexr libatlas-base-dev python3-dev python3-numpy \
    libtbb2 libtbb-dev libdc1394-22-dev libopenexr-dev \
    libgstreamer-plugins-base1.0-dev libgstreamer1.0-dev

# Downloadand unpack sources

# go back to main software dir 
cd ../../
wget -O opencv.zip https://github.com/opencv/opencv/archive/master.zip
wget -O opencv_contrib.zip https://github.com/opencv/opencv_contrib/archive/master.zip
unzip opencv.zip
mv opencv-master opencv
unzip opencv_contrib.zip
mv opencv_contrib-master opencv_contrib

# Create build directory and switch into it
cd opencv
mkdir -p build && cd build

# Configure
cmake -D CMAKE_BUILD_TYPE=RELEASE \
    -D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib/modules/ \
    -D WITH_GSTREAMER=ON \
    -D CMAKE_INSTALL_PREFIX=/usr/local \
    -D OPENCV_GENERATE_PKGCONFIG=ON \
    -D BUILD_EXAMPLES=OFF \
    -D INSTALL_PYTHON_EXAMPLES=OFF \
    -D INSTALL_C_EXAMPLES=OFF \
    -D PYTHON_EXECUTABLE=$(which python2) \
    -D BUILD_opencv_python2=OFF \
    -D PYTHON3_EXECUTABLE=$(which python3) \
    -D PYTHON3_INCLUDE_DIR=$(python3 -c "from distutils.sysconfig import get_python_inc; print(get_python_inc())") \
    -D PYTHON3_PACKAGES_PATH=$(python3 -c "from distutils.sysconfig import get_python_lib; print(get_python_lib())") \
    ..

# Build
make -j6

# Install
sudo make install