#!/usr/bin/env bash

: '

todo

- docs for base setup: sudo apt-get -y install zlib1g-dev make git
- shrink icu data
'

MASON_VERSION="e4c1746"

function setup_mason() {
    if [[ ! -d ./.mason ]]; then
        git clone https://github.com/mapbox/mason.git .mason || return
    elif ! git -C .mason rev-parse -q --verify "$MASON_VERSION" >/dev/null; then
        git -C .mason fetch --all || true # non-fatal
    fi
    git -C .mason checkout --detach "$MASON_VERSION" -- || return
    case ":$PATH:" in
        *":$PWD/.mason:"*) : already there ;;
        *) export PATH="$PWD/.mason:$PATH" ;;
    esac
    export CXX=${CXX:-clang++}
    export CC=${CC:-clang}
}

function install() {
    MASON_PLATFORM_ID=$(mason env MASON_PLATFORM_ID)
    if [[ ! -d ./mason_packages/${MASON_PLATFORM_ID}/${1}/${2} ]]; then
        mason install $1 $2
        if [[ ${3:-false} != false ]]; then
            LA_FILE=$(mason prefix $1 $2)/lib/$3.la
            if [[ -f ${LA_FILE} ]]; then
                perl -i -p -e 's:\Q$ENV{HOME}/build/mapbox/mason\E:$ENV{PWD}:g' ${LA_FILE}
            else
                echo "$LA_FILE not found"
            fi
        fi
    fi
    # the rm here is to workaround https://github.com/mapbox/mason/issues/230
    rm -f ./mason_packages/.link/mason.ini
    mason link $1 $2
}

ICU_VERSION="57.1"
BOOST_VERSION="1.65.1"

function install_mason_deps() {
    install ccache 3.3.1
    install zlib 1.2.8
    install jpeg_turbo 1.5.1 libjpeg
    install libpng 1.6.28 libpng
    install libtiff 4.0.7 libtiff
    install libpq 9.6.2
    install sqlite 3.17.0 libsqlite3
    install expat 2.2.0 libexpat
    install icu ${ICU_VERSION}
    install proj 4.9.3 libproj
    install pixman 0.34.0 libpixman-1
    install cairo 1.14.8 libcairo
    install webp 0.6.0 libwebp
    install libgdal 2.1.3 libgdal
    install boost ${BOOST_VERSION}
    install boost_libsystem ${BOOST_VERSION}
    install boost_libfilesystem ${BOOST_VERSION}
    install boost_libprogram_options ${BOOST_VERSION}
    install boost_libregex_icu57 ${BOOST_VERSION}
    # technically boost thread and python are not a core dep, but installing
    # here by default helps make python-mapnik builds easier
    install boost_libthread ${BOOST_VERSION}
    install boost_libpython ${BOOST_VERSION}
    install freetype 2.7.1 libfreetype
    install harfbuzz 1.4.4-ft libharfbuzz
}

MASON_LINKED_ABS=$(pwd)/mason_packages/.link
MASON_LINKED_REL=./mason_packages/.link
export C_INCLUDE_PATH="${MASON_LINKED_ABS}/include"
export CPLUS_INCLUDE_PATH="${MASON_LINKED_ABS}/include"
export LIBRARY_PATH="${MASON_LINKED_ABS}/lib"

function make_config() {
    echo "
CXX = '$CXX'
CC = '$CC'
CUSTOM_CXXFLAGS = '-D_GLIBCXX_USE_CXX11_ABI=0'
RUNTIME_LINK = 'static'
INPUT_PLUGINS = 'all'
PATH = '${MASON_LINKED_REL}/bin'
PKG_CONFIG_PATH = '${MASON_LINKED_REL}/lib/pkgconfig'
PATH_REMOVE = '/usr:/usr/local'
PATH_REPLACE = '$HOME/build/mapbox/mason/mason_packages:./mason_packages'
BOOST_INCLUDES = '${MASON_LINKED_REL}/include'
BOOST_LIBS = '${MASON_LINKED_REL}/lib'
ICU_INCLUDES = '${MASON_LINKED_REL}/include'
ICU_LIBS = '${MASON_LINKED_REL}/lib'
HB_INCLUDES = '${MASON_LINKED_REL}/include'
HB_LIBS = '${MASON_LINKED_REL}/lib'
PNG_INCLUDES = '${MASON_LINKED_REL}/include/libpng16'
PNG_LIBS = '${MASON_LINKED_REL}/lib'
JPEG_INCLUDES = '${MASON_LINKED_REL}/include'
JPEG_LIBS = '${MASON_LINKED_REL}/lib'
TIFF_INCLUDES = '${MASON_LINKED_REL}/include'
TIFF_LIBS = '${MASON_LINKED_REL}/lib'
WEBP_INCLUDES = '${MASON_LINKED_REL}/include'
WEBP_LIBS = '${MASON_LINKED_REL}/lib'
PROJ_INCLUDES = '${MASON_LINKED_REL}/include'
PROJ_LIBS = '${MASON_LINKED_REL}/lib'
PG_INCLUDES = '${MASON_LINKED_REL}/include'
PG_LIBS = '${MASON_LINKED_REL}/lib'
FREETYPE_INCLUDES = '${MASON_LINKED_REL}/include/freetype2'
FREETYPE_LIBS = '${MASON_LINKED_REL}/lib'
SVG_RENDERER = True
CAIRO_INCLUDES = '${MASON_LINKED_REL}/include'
CAIRO_LIBS = '${MASON_LINKED_REL}/lib'
SQLITE_INCLUDES = '${MASON_LINKED_REL}/include'
SQLITE_LIBS = '${MASON_LINKED_REL}/lib'
BENCHMARK = True
CPP_TESTS = True
PGSQL2SQLITE = True
XMLPARSER = 'ptree'
SVG2PNG = True
"
}

# NOTE: the `mapnik-settings.env` is used by test/run (which is run by `make test`)
function setup_runtime_settings() {
    echo "export PROJ_LIB=${MASON_LINKED_ABS}/share/proj" > mapnik-settings.env
    echo "export ICU_DATA=${MASON_LINKED_ABS}/share/icu/${ICU_VERSION}" >> mapnik-settings.env
    echo "export GDAL_DATA=${MASON_LINKED_ABS}/share/gdal" >> mapnik-settings.env
}

# turn arguments of the form NAME=VALUE into exported variables;
# any other arguments are reported and cause error return status
function export_variables() {
    local arg= ret=0
    for arg
    do
        if [[ "$arg" =~ ^[[:alpha:]][_[:alnum:]]*= ]]
        then
            local -n var="${arg%%=*}"
            export var="${arg#*=}"
        else
            printf >&2 "bootstrap.sh: invalid argument: %s\n" "$arg"
            ret=1
        fi
    done
    return $ret
}

function main() {
    export_variables "$@" || return
    # setup_mason must not run in subshell, because it sets default
    # values of CC, CXX and adds mason to PATH, which we want to keep
    # when sourced
    setup_mason || return
    (
        # this is wrapped in subshell to allow sourcing this script
        # without having the terminal closed on error
        set -eu
        set -o pipefail

        install_mason_deps
        make_config > ./config.py
        setup_runtime_settings

        printf "\n\e[1;32m%s\e[m\n" "bootstrap successful, now run:"
        echo ""
        echo "    ./configure && make"
        echo ""
    )
}

main "$@"