--!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        find_vcpkg.lua
--

-- imports
import("lib.detect.find_file")
import("lib.detect.find_program")
import("core.base.global")
import("core.project.config")

-- find vcpkg
--
-- @param opt   the argument options, e.g. {version = true}
--
-- @return      program, version
--
-- @code
--
-- local vcpkg = find_vcpkg()
-- local vcpkg, version = find_vcpkg({version = true})
--
-- @endcode
--
function main(opt)

    -- init options
    opt         = opt or {}
    opt.check   = opt.check or "version"
    opt.command = opt.command or "version"

    -- init the search directories
    local paths = {}
    local vcpkg = config.get("vcpkg") or global.get("vcpkg")
    if vcpkg then
        if os.isfile(vcpkg) then
            vcpkg = path.directory(vcpkg)
        end
        table.insert(paths, vcpkg)
    end
    if is_host("windows") then
        -- attempt to read path info after running `vcpkg integrate install`
        local pathfile = "~/../Local/vcpkg/vcpkg.path.txt"
        if os.isfile(pathfile) then
            local dir = io.readfile(pathfile):trim()
            if os.isdir(dir) then
                table.insert(paths, dir)
            end
        end
    end

    -- find program
    opt.paths = paths
    opt.envs  = {PATH = os.getenv("PATH")}
    local program = find_program(opt.program or "vcpkg", opt)

    -- find program version
    local version = nil
    if program and opt and opt.version then
        version = find_programver(program, opt)
    end
    return program, version
end