--!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-present, TBOOX Open Source Group.
--
-- @author      ruki
-- @file        cmake.lua
--

-- imports
import("core.base.option")
import("core.project.config")
import("core.tool.toolchain")
import("core.platform.platform")
import("lib.detect.find_file")
import("lib.detect.find_tool")

-- get build directory
function _get_buildir()
    return config.buildir() or "build"
end

-- get artifacts directory
function _get_artifacts_dir()
    return path.absolute(path.join(_get_buildir(), "artifacts"))
end

-- get the build environment
function _get_buildenv(key)
    local value = config.get(key)
    if value == nil then
        value = platform.toolconfig(key, config.plat())
    end
    if value == nil then
        value = platform.tool(key, config.plat())
    end
    return value
end

-- get configs for windows
function _get_configs_for_windows(configs)
    table.insert(configs, "-A")
    if is_arch("x86", "i386") then
        table.insert(configs, "Win32")
    else
        table.insert(configs, "x64")
    end
end

-- get configs for android
function _get_configs_for_android(configs)
    -- https://developer.android.google.cn/ndk/guides/cmake
    local ndk = config.get("ndk")
    if ndk and os.isdir(ndk) then
        local arch = config.arch()
        local ndk_sdkver = config.get("ndk_sdkver")
        local ndk_cxxstl = config.get("ndk_cxxstl")
        table.insert(configs, "-DCMAKE_TOOLCHAIN_FILE=" .. path.join(ndk, "build/cmake/android.toolchain.cmake"))
        if arch then
            table.insert(configs, "-DANDROID_ABI=" .. arch)
        end
        if ndk_sdkver then
            table.insert(configs,  "-DANDROID_NATIVE_API_LEVEL=" .. ndk_sdkver)
        end
        if ndk_cxxstl then
            table.insert(configs, "-DANDROID_STL=" .. ndk_cxxstl)
        end
    end
end

-- get configs for appleos
function _get_configs_for_appleos(configs)
    local envs                     = {}
    local cflags                   = table.join(table.wrap(_get_buildenv("cxflags")), _get_buildenv("cflags"))
    local cxxflags                 = table.join(table.wrap(_get_buildenv("cxflags")), _get_buildenv("cxxflags"))
    envs.CMAKE_C_FLAGS             = table.concat(cflags, ' ')
    envs.CMAKE_CXX_FLAGS           = table.concat(cxxflags, ' ')
    envs.CMAKE_ASM_FLAGS           = table.concat(table.wrap(_get_buildenv("asflags")), ' ')
    envs.CMAKE_STATIC_LINKER_FLAGS = table.concat(table.wrap(_get_buildenv("arflags")), ' ')
    envs.CMAKE_EXE_LINKER_FLAGS    = table.concat(table.wrap(_get_buildenv("ldflags")), ' ')
    envs.CMAKE_SHARED_LINKER_FLAGS = table.concat(table.wrap(_get_buildenv("shflags")), ' ')
    if is_plat("watchos") then
        envs.CMAKE_SYSTEM_NAME     = "watchOS"
    else
        envs.CMAKE_SYSTEM_NAME     = "iOS"
    end
    envs.CMAKE_FIND_ROOT_PATH_MODE_LIBRARY = "ONLY"
    envs.CMAKE_FIND_ROOT_PATH_MODE_INCLUDE = "ONLY"
    envs.CMAKE_FIND_ROOT_PATH_MODE_PROGRAM = "NEVER"
    -- avoid install bundle targets
    envs.CMAKE_MACOSX_BUNDLE       = "NO"
    for k, v in pairs(envs) do
        table.insert(configs, "-D" .. k .. "=" .. v)
    end
end

-- get configs for mingw
function _get_configs_for_mingw(configs)
    local envs                     = {}
    local cflags                   = table.join(table.wrap(_get_buildenv("cxflags")), _get_buildenv("cflags"))
    local cxxflags                 = table.join(table.wrap(_get_buildenv("cxflags")), _get_buildenv("cxxflags"))
    local sdkdir                   = _get_buildenv("mingw") or _get_buildenv("sdk")
    envs.CMAKE_C_COMPILER          = _get_buildenv("cc")
    envs.CMAKE_CXX_COMPILER        = _get_buildenv("cxx")
    envs.CMAKE_ASM_COMPILER        = _get_buildenv("as")
    envs.CMAKE_AR                  = _get_buildenv("ar")
    envs.CMAKE_LINKER              = _get_buildenv("ld")
    envs.CMAKE_RANLIB              = _get_buildenv("ranlib")
    envs.CMAKE_C_FLAGS             = table.concat(cflags, ' ')
    envs.CMAKE_CXX_FLAGS           = table.concat(cxxflags, ' ')
    envs.CMAKE_ASM_FLAGS           = table.concat(table.wrap(_get_buildenv("asflags")), ' ')
    envs.CMAKE_STATIC_LINKER_FLAGS = table.concat(table.wrap(_get_buildenv("arflags")), ' ')
    envs.CMAKE_EXE_LINKER_FLAGS    = table.concat(table.wrap(_get_buildenv("ldflags")), ' ')
    envs.CMAKE_SHARED_LINKER_FLAGS = table.concat(table.wrap(_get_buildenv("shflags")), ' ')
    envs.CMAKE_SYSTEM_NAME         = "Windows"
    -- avoid find and add system include/library path
    envs.CMAKE_FIND_ROOT_PATH      = sdkdir
    envs.CMAKE_SYSROOT             = sdkdir
    envs.CMAKE_FIND_ROOT_PATH_MODE_LIBRARY = "ONLY"
    envs.CMAKE_FIND_ROOT_PATH_MODE_INCLUDE = "ONLY"
    envs.CMAKE_FIND_ROOT_PATH_MODE_PROGRAM = "NEVER"
    -- avoid add -isysroot on macOS
    envs.CMAKE_OSX_SYSROOT = ""
    -- Avoid cmake to add the flags -search_paths_first and -headerpad_max_install_names on macOS
    envs.HAVE_FLAG_SEARCH_PATHS_FIRST = "0"
    for k, v in pairs(envs) do
        table.insert(configs, "-D" .. k .. "=" .. v)
    end
end

-- get configs for cross
function _get_configs_for_cross(configs)
    local envs                     = {}
    local cflags                   = table.join(table.wrap(_get_buildenv("cxflags")), _get_buildenv("cflags"))
    local cxxflags                 = table.join(table.wrap(_get_buildenv("cxflags")), _get_buildenv("cxxflags"))
    local sdkdir                   = _get_buildenv("sdk")
    envs.CMAKE_C_COMPILER          = _get_buildenv("cc")
    envs.CMAKE_CXX_COMPILER        = _get_buildenv("cxx")
    envs.CMAKE_ASM_COMPILER        = _get_buildenv("as")
    envs.CMAKE_AR                  = _get_buildenv("ar")
    envs.CMAKE_LINKER              = _get_buildenv("ld")
    envs.CMAKE_RANLIB              = _get_buildenv("ranlib")
    envs.CMAKE_C_FLAGS             = table.concat(cflags, ' ')
    envs.CMAKE_CXX_FLAGS           = table.concat(cxxflags, ' ')
    envs.CMAKE_ASM_FLAGS           = table.concat(table.wrap(_get_buildenv("asflags")), ' ')
    envs.CMAKE_STATIC_LINKER_FLAGS = table.concat(table.wrap(_get_buildenv("arflags")), ' ')
    envs.CMAKE_EXE_LINKER_FLAGS    = table.concat(table.wrap(_get_buildenv("ldflags")), ' ')
    envs.CMAKE_SHARED_LINKER_FLAGS = table.concat(table.wrap(_get_buildenv("shflags")), ' ')
    envs.CMAKE_SYSTEM_NAME         = "Linux"
    -- avoid find and add system include/library path
    envs.CMAKE_FIND_ROOT_PATH      = sdkdir
    envs.CMAKE_SYSROOT             = sdkdir
    envs.CMAKE_FIND_ROOT_PATH_MODE_LIBRARY = "ONLY"
    envs.CMAKE_FIND_ROOT_PATH_MODE_INCLUDE = "ONLY"
    envs.CMAKE_FIND_ROOT_PATH_MODE_PROGRAM = "NEVER"
    -- avoid add -isysroot on macOS
    envs.CMAKE_OSX_SYSROOT = ""
    -- Avoid cmake to add the flags -search_paths_first and -headerpad_max_install_names on macOS
    envs.HAVE_FLAG_SEARCH_PATHS_FIRST = "0"
    for k, v in pairs(envs) do
        table.insert(configs, "-D" .. k .. "=" .. v)
    end
end

-- get configs
function _get_configs(artifacts_dir)

    -- add prefix
    local configs = {"-DCMAKE_INSTALL_PREFIX=" .. artifacts_dir, "-DCMAKE_INSTALL_LIBDIR=" .. path.join(artifacts_dir, "lib")}
    if is_plat("windows") then
        _get_configs_for_windows(configs)
    elseif is_plat("android") then
        _get_configs_for_android(configs)
    elseif is_plat("iphoneos", "watchos") then
        _get_configs_for_appleos(configs)
    elseif is_plat("mingw") then
        _get_configs_for_mingw(configs)
    elseif not is_plat(os.subhost()) then
        _get_configs_for_cross(configs)
    end

    -- enable verbose?
    if option.get("verbose") then
        table.insert(configs, "-DCMAKE_VERBOSE_MAKEFILE=ON")
    end

    -- add extra user configs
    local tryconfigs = config.get("tryconfigs")
    if tryconfigs then
        for _, opt in ipairs(os.argv(tryconfigs)) do
            table.insert(configs, tostring(opt))
        end
    end

    -- add build directory
    table.insert(configs, '..')
    return configs
end

-- detect build-system and configuration file
function detect()
    return find_file("CMakeLists.txt", os.curdir())
end

-- do clean
function clean()
    local buildir = _get_buildir()
    if os.isdir(buildir) then
        local configfile = find_file("[mM]akefile", buildir) or (is_plat("windows") and find_file("*.sln", buildir))
        if configfile then
            local oldir = os.cd(buildir)
            if is_plat("windows") then
                local runenvs = toolchain.load("msvc"):runenvs()
                local msbuild = find_tool("msbuild", {envs = runenvs})
                os.vexecv(msbuild.program, {configfile, "-nologo", "-t:Clean", "-p:Configuration=" .. (is_mode("debug") and "Debug" or "Release"), "-p:Platform=" .. (is_arch("x64") and "x64" or "Win32")}, {envs = runenvs})
            else
                os.vexec("make clean")
            end
            os.cd(oldir)
        end
    end
end

-- do build
function build()

    -- get artifacts directory
    local artifacts_dir = _get_artifacts_dir()
    if not os.isdir(artifacts_dir) then
        os.mkdir(artifacts_dir)
    end
    os.cd(_get_buildir())

    -- generate makefile
    local cmake = assert(find_tool("cmake"), "cmake not found!")
    local configfile = find_file("[mM]akefile", os.curdir()) or (is_plat("windows") and find_file("*.sln", os.curdir()))
    if not configfile or os.mtime(config.filepath()) > os.mtime(configfile) then
        os.vexecv(cmake.program, _get_configs(artifacts_dir))
    end

    -- do build
    if is_plat("windows") then
        local runenvs = toolchain.load("msvc"):runenvs()
        local msbuild = find_tool("msbuild", {envs = runenvs})
        local slnfile = assert(find_file("*.sln", os.curdir()), "*.sln file not found!")
        os.vexecv(msbuild.program, {slnfile, "-nologo", "-t:Build", "-m", "-p:Configuration=" .. (is_mode("debug") and "Debug" or "Release"), "-p:Platform=" .. (is_arch("x64") and "x64" or "Win32")}, {envs = runenvs})
        local projfile = os.isfile("INSTALL.vcxproj") and "INSTALL.vcxproj" or "INSTALL.vcproj"
        if os.isfile(projfile) then
            os.vexecv(msbuild.program, {projfile, "/property:configuration=" .. (is_mode("debug") and "Debug" or "Release")}, {envs = runenvs})
        end
    else
        local argv = {"-j" .. option.get("jobs")}
        if option.get("verbose") then
            table.insert(argv, "VERBOSE=1")
        end
        if is_host("bsd") then
            os.vexecv("gmake", argv)
            os.vexecv("gmake", {"install"})
        else
            os.vexecv("make", argv)
            os.vexecv("make", {"install"})
        end
    end
    cprint("output to ${bright}%s", artifacts_dir)
    cprint("${color.success}build ok!")
end