--!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        find_package.lua
--

-- imports
import("lib.detect.find_tool")
import("lib.detect.find_file")
import("lib.detect.pkg_config")
import("package.manager.find_package")

-- find package from the brew package manager
--
-- @param name  the package name, e.g. zlib, pcre/libpcre16
-- @param opt   the options, e.g. {verbose = true, version = "1.12.x")
--
function main(name, opt)

    -- find brew
    local brew = find_tool("brew")
    if not brew then
        return 
    end

    -- parse name, e.g. pcre/libpcre16
    local nameinfo = name:split('/')
    local pcname   = nameinfo[2] or nameinfo[1]

    -- find the prefix directory of brew 
    local brew_pkg_root = try { function () return os.iorunv(brew.program, {"--prefix"}) end } or "/usr/local"
    brew_pkg_root = path.join(brew_pkg_root:trim(), opt.plat == "macosx" and "Cellar" or "opt")

    -- find package from pkg-config/*.pc
    local result = nil
    local pcfile = find_file(pcname .. ".pc", path.join(brew_pkg_root, nameinfo[1], "*/lib/pkgconfig"))
    if pcfile then
        opt.configdirs = path.directory(pcfile)
        result = find_package("pkg_config::" .. pcname, opt)
        if not result then
            -- attempt to get includedir variable from pkg-config/xx.pc 
            local varinfo = pkg_config.variables(pcname, "includedir", opt)
            if varinfo.includedir then
                result = result or {}
                result.version = pkg_config.version(pcname, opt)
                result.includedirs = varinfo.includedir
            end
        end
    end

    -- find package from xxx/lib, xxx/include
    if not result then
        local libfile = find_file("*.a", path.join(brew_pkg_root, nameinfo[1], "*", "lib"))
        if libfile then
            opt.linkdirs    = path.directory(libfile)
            opt.includedirs = path.join(path.directory(opt.linkdirs), "include")
            result = find_package("system::" .. name, opt)
        end
    end
    return result
end