#!/usr/bin/env bash
# This file is intended to be sourced by other scripts, not executed

process_args() {
    if [[ $# != 3 ]]
    then
        # <host>: win32 or win64
        # <build_type>: native or cross
        # <link_type>: static or shared
        echo "Syntax: $0 <host> <build_type> <link_type>" >&2
        exit 1
    fi

    HOST="$1"
    BUILD_TYPE="$2" # native or cross
    LINK_TYPE="$3" # static or shared
    DIRNAME="$HOST-$BUILD_TYPE-$LINK_TYPE"

    if [[ "$BUILD_TYPE" != native && "$BUILD_TYPE" != cross ]]
    then
        echo "Unsupported build type (expected native or cross): $BUILD_TYPE" >&2
        exit 1
    fi

    if [[ "$LINK_TYPE" != static && "$LINK_TYPE" != shared ]]
    then
        echo "Unsupported link type (expected static or shared): $LINK_TYPE" >&2
        exit 1
    fi

    if [[ "$BUILD_TYPE" == cross ]]
    then
        if [[ "$HOST" = win32 ]]
        then
            HOST_TRIPLET=i686-w64-mingw32
        elif [[ "$HOST" = win64 ]]
        then
            HOST_TRIPLET=x86_64-w64-mingw32
        else
            echo "Unsupported cross-build to host: $HOST" >&2
            exit 1
        fi
    fi
}

DEPS_DIR=$(dirname ${BASH_SOURCE[0]})
cd "$DEPS_DIR"

PATCHES_DIR="$PWD/patches"

WORK_DIR="$PWD/work"
SOURCES_DIR="$WORK_DIR/sources"
BUILD_DIR="$WORK_DIR/build"
INSTALL_DIR="$WORK_DIR/install"

mkdir -p "$INSTALL_DIR" "$SOURCES_DIR" "$WORK_DIR"

checksum() {
    local file="$1"
    local sum="$2"
    echo "$file: verifying checksum..."
    echo "$sum  $file" | shasum -a256 -c
}

get_file() {
    local url="$1"
    local file="$2"
    local sum="$3"
    if [[ -f "$file" ]]
    then
        echo "$file: found"
    else
        echo "$file: not found, downloading..."
        wget "$url" -O "$file"
    fi
    checksum "$file" "$sum"
}