--!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, Xmake Open Source Community.
--
-- @author      ruki
-- @file        pkgconfig_importfiles.lua
--

-- install pkgconfig/.pc import files for the target
--
-- @param target    the target instance
-- @param opt       the options, e.g. {installdir = "", libdir = "", includedir = ""}
--
function main(target, opt)

    -- check
    opt = opt or {}
    assert(target:is_library(), 'pkgconfig_importfiles: only support for library target(%s)!', target:name())
    local installdir = path.unix(path.normalize(target:installdir()))
    if not installdir then
        return
    end

    -- get pkgconfig/.pc file
    local libdir = path.unix(path.normalize(opt.libdir and path.join(installdir, opt.libdir) or target:libdir()))
    local pcfile = path.join(libdir, "pkgconfig", opt.filename or (target:basename() .. ".pc"))
    if not libdir:startswith(installdir) then
        raise("target(%s): libdir(%s) is not in installdir(%s)", target:name(), libdir, installdir)
    end

    -- get includedirs
    local includedirs = opt.includedirs

    -- get links and linkdirs
    local links = opt.links or target:basename()
    local linkdirs = opt.linkdirs

    -- get libs
    local libs = ""
    for _, linkdir in ipairs(linkdirs) do
        local linkdir = path.unix(path.normalize(linkdir)):replace(installdir, "${exec_prefix}", {plain = true})
        if linkdir ~= "${exec_prefix}/lib" then
            libs = libs .. " -L" .. linkdir
        end
    end
    libs = libs .. " -L${libdir}"
    if not target:is_headeronly() then
        for _, link in ipairs(links) do
            libs = libs .. " -l" .. link
        end
    end
    libs = libs:trim()

    -- get cflags
    local cflags = ""
    for _, includedir in ipairs(includedirs) do
        local includedir = path.unix(path.normalize(includedir)):replace(installdir, "${prefix}", {plain = true})
        if includedir ~= "${prefix}/include" then
            cflags = cflags .. " -I" .. includedir
        end
    end
    cflags = cflags .. " -I${includedir}"
    cflags = cflags:trim()

    -- trace
    vprint("generating %s ..", pcfile)

    -- generate a *.pc file
    local file = io.open(pcfile, 'w')
    if file then
        file:print("# Generated by Xmake")
        file:print("prefix=%s", "${pcfiledir}/" .. path.unix(path.relative(installdir, path.directory(pcfile))))
        file:print("exec_prefix=${prefix}")
        file:print("libdir=${exec_prefix}/lib")
        file:print("includedir=${prefix}/include")
        file:print("")
        file:print("Name: %s", target:name())
        file:print("Description: %s", target:name())
        local version = target:get("version")
        if version then
            file:print("Version: %s", version)
        end
        file:print("Libs: %s", libs)
        file:print("Cflags: %s", cflags)
        file:close()
    end
end