#!/bin/bash

BUILD_DIR="$(cd $(dirname $0) && pwd)";
TMUX_VERSION=${TMUX_VERSION:-3.1b}
NCURSES_VERSION=${NCURSES_VERSION:-6.2}
LIBEVENT_VERSION=${LIBEVENT_VERSION:-2.1.10-stable}
UTF8PROC_VERSION=${UTF8PROC_VERSION:-2.4.0}

BUILD_PREBUILT_DEP="$BUILD_DIR/prebuilt/dep";
BUILD_PREBUILT_TMUX="$BUILD_DIR/prebuilt/tmux";

echo "We need wget or curl, tar, C compiler(gcc for default), cmake, make, ";
echo "BUILD_DIR=$BUILD_DIR";
echo "BUILD_PREBUILT_DEP=$BUILD_PREBUILT_DEP";
echo "BUILD_PREBUILT_TMUX=$BUILD_PREBUILT_TMUX";
sleep 2;

# export CC=musl-gcc
# export CFLAGS="-fPIC -I$BUILD_PREBUILT_DEP/dep/include"
if [[ ${CFLAGS} == *fPIC* ]]; then
    export CFLAGS="$CFLAGS -I$BUILD_PREBUILT_DEP/dep/include"
else
    export CFLAGS="$CFLAGS -fPIC -I$BUILD_PREBUILT_DEP/dep/include"
fi

die() {
  echo "Error: $*" >&2
  exit 1
}

download_pkg() {
  local filename=${2:-${1##*/}}
  local cmd="true"

  if [[ ! -e "$filename" ]]; then
    if type -p curl >/dev/null 2>&1; then
      cmd="curl -Lk \"$1\" -o \"$filename\""
    elif type -p wget >/dev/null 2>&1; then
      cmd="wget --no-check-certificate \"$1\" -O \"$filename\""
    else
      die "You need curl or wget"
    fi
    echo "run: $cmd"
  fi
  eval "$cmd"
}


# ============ build libevent ============
set -e

cd "$BUILD_DIR"
download_pkg https://github.com/libevent/libevent/releases/download/release-$LIBEVENT_VERSION/libevent-$LIBEVENT_VERSION.tar.gz
if [ 0 -ne $? ]; then
    echo "download libevent failed";
    exit 1;
fi
if [ -e "libevent-$LIBEVENT_VERSION" ]; then
    rm -rf "libevent-$LIBEVENT_VERSION"
fi
tar -axvf libevent-$LIBEVENT_VERSION.tar.gz
if [ ! -e "libevent-$LIBEVENT_VERSION" ]; then
    echo "unpack libevent failed"
    exit 1
fi

cd libevent-$LIBEVENT_VERSION
./configure \
  --prefix="$BUILD_PREBUILT_DEP" \
  --disable-openssl \
  --enable-shared=no \
  --enable-static=yes \
  --with-pic
make -j4
make install

# ============ build ncurses ============
cd "$BUILD_DIR";
download_pkg https://invisible-mirror.net/archives/ncurses/ncurses-$NCURSES_VERSION.tar.gz ;
if [ 0 -ne $? ]; then
    echo "download ncurses failed";
    exit 1;
fi
if [ -e "ncurses-$NCURSES_VERSION" ]; then
    rm -rf "ncurses-$NCURSES_VERSION";
fi
tar -axvf ncurses-$NCURSES_VERSION.tar.gz;

if [ ! -e "ncurses-$NCURSES_VERSION" ]; then
    echo "unpack ncurses failed"
    exit 1
fi

cd ncurses-$NCURSES_VERSION
# ncursesw: --enable-ext-colors --enable-widec
# build with clang: CC=clang CXX=clang++ CFLAGS="-Wno-unused-command-line-argument" AR=llvm-ar LD=lld
./configure \
  --prefix="$BUILD_PREBUILT_DEP" \
  --without-cxx \
  --without-cxx-binding \
  --with-termlib \
  --enable-termcap \
  --enable-ext-colors \
  --enable-ext-mouse \
  --enable-bsdpad \
  --enable-opaque-curses \
  --with-terminfo-dirs=/etc/terminfo:/usr/share/terminfo:/lib/terminfo \
  --with-termpath=/etc/termcap:/usr/share/misc/termcap \
  --with-fallbacks="linux,xterm,xterm-color,xterm-256color,vt100"
make -j4
make install

# ============ build utf8proc ============
cd "$BUILD_DIR";
download_pkg https://github.com/JuliaLang/utf8proc/archive/v$UTF8PROC_VERSION.tar.gz utf8proc-$UTF8PROC_VERSION.tar.gz
if [ 0 -ne $? ]; then
    echo "download utf8proc failed"
    exit 1
fi

if [ -e "utf8proc-$UTF8PROC_VERSION" ]; then
    rm -rf "utf8proc-$UTF8PROC_VERSION"
fi
tar -axvf utf8proc-$UTF8PROC_VERSION.tar.gz

if [ ! -e "utf8proc-$UTF8PROC_VERSION" ]; then
    echo "unpack utf8proc failed"
    exit 1
fi

mkdir -p utf8proc-$UTF8PROC_VERSION/build
cd utf8proc-$UTF8PROC_VERSION/build
cmake .. -DCMAKE_INSTALL_PREFIX="$BUILD_PREBUILT_DEP" -DBUILD_SHARED_LIBS=OFF
cmake --build .
if [ 0 -ne $? ]; then
    echo "build utf8proc failed"
    exit 1
fi
# install
cp ../*.h "$BUILD_PREBUILT_DEP/include"
cp *.a "$BUILD_PREBUILT_DEP/lib"

# ============ build tmux ============
cd "$BUILD_DIR";
download_pkg https://github.com/tmux/tmux/releases/download/$TMUX_VERSION/tmux-$TMUX_VERSION.tar.gz
if [ 0 -ne $? ]; then
    echo "download tmux failed"
    exit 1
fi

if [ -e "tmux-$TMUX_VERSION" ]; then
    rm -rf "tmux-$TMUX_VERSION"
fi
tar -axvf tmux-$TMUX_VERSION.tar.gz

if [ ! -e "tmux-$TMUX_VERSION" ]; then
    echo "unpack tmux failed"
    exit 1
fi

NCURSES_HEADER="$(find $BUILD_PREBUILT_DEP/include -name curses.h)"

cd tmux-$TMUX_VERSION

PKG_CONFIG_PATH="$BUILD_PREBUILT_DEP/lib/pkgconfig" \
LIBNCURSES_CFLAGS="-I$(dirname $NCURSES_HEADER)" \
LIBNCURSES_LIBS="-L$BUILD_PREBUILT_DEP/lib" \
LIBEVENT_CFLAGS="-I$BUILD_PREBUILT_DEP/include" \
LIBEVENT_LIBS="-L$BUILD_PREBUILT_DEP/lib -levent" \
./configure \
  --prefix="$BUILD_PREBUILT_TMUX" \
  --enable-static \
  --enable-utf8proc

make -j4
make install

# pack tmux
cd "$BUILD_DIR/prebuilt";
tar -zcvf tmux-$TMUX_VERSION.musl-bin.tar.gz tmux
cd "$BUILD_DIR"

mv -f "$BUILD_DIR/prebuilt/tmux-$TMUX_VERSION.musl-bin.tar.gz" ./
echo "all jobs done."