--!A cross-platform build utility based on Lua
--
-- Licensed 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
--

-- imports
import("core.project.config")

-- get configs
function _get_configs(package, configs)

    -- add prefix
    local configs = configs or {}
    table.insert(configs, "--prefix=" .. package:installdir())

    -- add host for cross-complation
    if not configs.host and not package:is_plat(os.host()) then
        if package:is_plat("iphoneos") then
            local triples = 
            { 
                arm64  = "aarch64-apple-darwin",
                arm64e = "aarch64-apple-darwin",
                armv7  = "armv7-apple-darwin",
                armv7s = "armv7s-apple-darwin",
                i386   = "i386-apple-darwin",
                x86_64 = "x86_64-apple-darwin"
            }
            table.insert(configs, "--host=" .. (triples[package:arch()] or triples.arm64))
        elseif package:is_plat("android") then
            -- @see https://developer.android.com/ndk/guides/other_build_systems#autoconf
            local triples = 
            {
                ["armv5te"]     = "arm-linux-androideabi",
                ["armv7-a"]     = "arm-linux-androideabi",
                ["arm64-v8a"]   = "aarch64-linux-android",
                i386            = "i686-linux-android",
                x86_64          = "x86_64-linux-android",
                mips            = "mips-linux-android",
                mips64          = "mips64-linux-android"
            }
            table.insert(configs, "--host=" .. (triples[package:arch()] or triples["armv7-a"]))
        elseif package:is_plat("mingw") then
            local triples = 
            { 
                i386   = "i686-w64-mingw32",
                x86_64 = "x86_64-w64-mingw32"
            }
            table.insert(configs, "--host=" .. (triples[package:arch()] or triples.i386))
        else
            raise("autoconf: unknown platform(%s)!", package:plat())
        end
    end
    return configs
end

-- get the build environments
function buildenvs(package)
    local envs = {}
    if package:is_plat(os.host()) then
        local cflags   = table.join(table.wrap(package:config("cxflags")), package:config("cflags"))
        local cxxflags = table.join(table.wrap(package:config("cxflags")), package:config("cxxflags"))
        envs.CFLAGS    = table.concat(cflags, ' ')
        envs.CXXFLAGS  = table.concat(cxxflags, ' ')
        envs.ASFLAGS   = table.concat(table.wrap(package:config("asflags")), ' ')
    else
        local cflags   = table.join(table.wrap(package:build_getenv("cxflags")), package:build_getenv("cflags"))
        local cxxflags = table.join(table.wrap(package:build_getenv("cxflags")), package:build_getenv("cxxflags"))
        envs.CC        = package:build_getenv("cc")
        envs.AS        = package:build_getenv("as")
        envs.AR        = package:build_getenv("ar")
        envs.LD        = package:build_getenv("ld")
        envs.LDSHARED  = package:build_getenv("sh")
        envs.CPP       = package:build_getenv("cpp")
        envs.RANLIB    = package:build_getenv("ranlib")
        envs.CFLAGS    = table.concat(cflags, ' ')
        envs.CXXFLAGS  = table.concat(cxxflags, ' ')
        envs.ASFLAGS   = table.concat(table.wrap(package:build_getenv("asflags")), ' ')
        envs.ARFLAGS   = table.concat(table.wrap(package:build_getenv("arflags")), ' ')
        envs.LDFLAGS   = table.concat(table.wrap(package:build_getenv("ldflags")), ' ')
        envs.SHFLAGS   = table.concat(table.wrap(package:build_getenv("shflags")), ' ')
    end
    local ACLOCAL_PATH = {}
    local PKG_CONFIG_PATH = {}
    for _, dep in ipairs(package:orderdeps()) do
        local pkgconfig = path.join(dep:installdir(), "lib", "pkgconfig")
        if os.isdir(pkgconfig) then
            table.insert(PKG_CONFIG_PATH, pkgconfig)
        end
        local aclocal = path.join(dep:installdir(), "share", "aclocal")
        if os.isdir(aclocal) then
            table.insert(ACLOCAL_PATH, aclocal)
        end
    end
    envs.ACLOCAL_PATH    = table.concat(ACLOCAL_PATH, path.envsep())
    envs.PKG_CONFIG_PATH = table.concat(PKG_CONFIG_PATH, path.envsep())
    return envs
end

-- configure package
function configure(package, configs, opt)

    -- init options
    opt = opt or {}

    -- 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 value ~= "" then
            if type(name) == "number" then
                table.insert(argv, value)
            else
                table.insert(argv, "--" .. name .. "=" .. value)
            end
        end
    end

    -- do configure
    os.vrunv("./configure", argv, {envs = opt.envs or buildenvs(package)})
end

-- install package
function install(package, configs, opt)

    -- do configure
    configure(package, configs, opt)

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