#!/usr/bin/env bash

expected_triplet=$TARGET

if [ -z "$expected_triplet" ]; then
    echo "ERROR: target triplet not provided!"
    exit 1
fi

ensure_tool() {
    command -v "$1" > /dev/null
    if [ $? -ne 0 ]; then
        echo "ERROR: Missing tool: $1"
        exit 1
    fi
}

if [ "$(uname -s)" = "Linux" ]; then
    is_linux=yes
fi

echo ">> Checking tools..."

ensure_tool gcc
ensure_tool g++
ensure_tool clang
ensure_tool clang++

mkdir -p host_tools

echo ">> Updating package database..."

[ -n "$is_linux" ] && sudo apt-get update

echo ">> Installing meson..."

if [ -n "$is_linux" ]; then
    sudo apt-get install ninja-build
else
    ninja_version=1.10.2
    cd host_tools
    wget "https://github.com/ninja-build/ninja/releases/download/v${ninja_version}/ninja-mac.zip" || exit 1
    tar xf ninja-mac.zip || exit 1
    rm ninja-mac.zip
    cd ..
    export PATH="$(pwd)/host_tools:$PATH"
fi

if [ -n "$(command -v pip3)" ]; then
    sudo pip3 install meson || exit 1
elif [ -n "$(command -v pip)" ]; then
    sudo pip install meson || exit 1
else
    echo "ERROR: pip not found"
    exit 1
fi

ensure_tool meson
ensure_tool ninja

if [ "$(uname -s)" != "Linux" ]; then
    exit 0
fi

if [ "${CC/gcc}" != "${CC}" ]; then
    sudo apt-get install ${CC} ${CC/gcc/g++} || exit 1
fi

current_triplet=`gcc -dumpmachine`

if [ "$expected_triplet" = "$current_triplet" ]; then
    exit 0
fi

echo ">> Installing toolchain..."

if [ "$expected_triplet" = "x86_64-w64-mingw32" ]; then
    gcc_suffix="mingw-w64"
    extra_packages="wine"
    need_span=yes
else
    gcc_suffix="${expected_triplet}"
    extra_packages="qemu-user"
fi

sudo apt-get install ${CC}-${gcc_suffix} ${CC/gcc/g++}-${gcc_suffix} ${extra_packages} || exit 1

# gcc9 too old to provide its own span...
if [ -n "$need_span" ]; then
    wget -O include/cubescript/span.hpp \
        https://raw.githubusercontent.com/tcbrindle/span/master/include/tcb/span.hpp

    # custom config
    cat << EOF > include/cubescript/cubescript_conf_user.hh
#include "span.hpp"

namespace cubescript {
    template<typename T>
    using span_type = tcb::span<T>;
}

#define LIBCUBESCRIPT_CONF_USER_SPAN
EOF
fi

exit $?