--!A cross-platform build utility based on Lua
--
-- Licensed to the Apache Software Foundation (ASF) under one
-- or more contributor license agreements.  See the NOTICE file
-- distributed with this work for additional information
-- regarding copyright ownership.  The ASF licenses this file
-- to you under the Apache License, Version 2.0 (the
-- "License"); you may not use this file except in compliance
-- with the License.  You may obtain a copy of the License at
--
--     http://www.apache.org/licenses/LICENSE-2.0
--
-- Unless required by applicable law or agreed to in writing, software
-- distributed under the License is distributed on an "AS IS" BASIS,
-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-- See the License for the specific language governing permissions and
-- limitations under the License.
-- 
-- Copyright (C) 2015 - 2019, TBOOX Open Source Group.
--
-- @author      ruki
-- @file        autoconf.lua
--

-- get configs
function _get_configs(package, configs)
    local configs = configs or {}
    table.insert(configs, "--prefix=" .. package:installdir())
    return configs
end

-- enter environments
function _enter_envs(package)
    
    -- get old environments
    local envs           = {}
    envs.CFLAGS          = os.getenv("CFLAGS")
    envs.CXXFLAGS        = os.getenv("CXXFLAGS")
    envs.ASFLAGS         = os.getenv("ASFLAGS")
    envs.ACLOCAL_PATH    = os.getenv("ACLOCAL_PATH")
    envs.PKG_CONFIG_PATH = os.getenv("PKG_CONFIG_PATH")

    -- set new environments
    local cflags   = package:config("cflags")
    local cxflags  = package:config("cxflags")
    local cxxflags = package:config("cxxflags")
    local asflags  = package:config("asflags")
    if package:plat() == "windows" then
        local vs_runtime = package:config("vs_runtime")
        if vs_runtime then
            cxflags = (cxflags or "") .. " /" .. vs_runtime .. (package:debug() and "d" or "")
        end
    end
    if cflags then
        os.addenv("CFLAGS", cflags)
    end
    if cxflags then
        os.addenv("CFLAGS", cxflags)
        os.addenv("CXXFLAGS", cxflags)
    end
    if cxxflags then
        os.addenv("CXXFLAGS", cxxflags)
    end
    if asflags then
        os.addenv("ASFLAGS", asflags)
    end
    for _, dep in ipairs(package:orderdeps()) do
        local pkgconfig = path.join(dep:installdir(), "lib", "pkgconfig")
        if os.isdir(pkgconfig) then
            os.addenv("PKG_CONFIG_PATH", pkgconfig)
        end
        local aclocal = path.join(dep:installdir(), "share", "aclocal")
        if os.isdir(aclocal) then
            os.addenv("ACLOCAL_PATH", aclocal)
        end
    end
    return envs
end

-- leave environments
function _leave_envs(package, envs)
    for k, v in pairs(envs) do
        os.setenv(k, v)
    end
end

-- install package
function install(package, configs)

    -- generate configure file
    if not os.isfile("configure") then
        if os.isfile("autogen.sh") then
            os.vrunv("sh", {"./autogen.sh"})
        elseif os.isfile("configure.ac") then
            os.vrun("autoreconf --install --symlink")
        end
    end

    -- pass configurations
    local argv = {}
    for name, value in pairs(_get_configs(package, configs)) do
        value = tostring(value):trim()
        if type(name) == "number" then
            if value ~= "" then
                table.insert(argv, value)
            end
        else
            table.insert(argv, "--" .. name .. "=" .. value)
        end
    end

    -- enter environments
    local envs = _enter_envs(package)

    -- do configure
    os.vrunv("./configure", argv)

    -- do make and install
    os.vrun("make -j4")
    os.vrun("make install")

    -- leave environments
    _leave_envs(package, envs)
end