--!A cross-platform build utility based on Lua
--
-- Licensed to the Apache Software Foundation (ASF) under one
-- or more contributor license agreements.  See the NOTICE file
-- distributed with this work for additional information
-- regarding copyright ownership.  The ASF licenses this file
-- to you 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 - 2018, TBOOX Open Source Group.
--
-- @author      ruki
-- @file        package.lua
--

-- imports
import("core.base.option")
import("core.base.task")
import("core.project.project")
import("lib.detect.find_tool")
import("impl.package")
import("impl.repository")
import("impl.environment")

-- attach package to option
function _attach_to_option(instance, opt)

    -- disable this option if this package is optional and missing
    if _g.optional_missing[instance:name()] then
        opt:enable(false)
    else

        -- add this package info to option
        opt:add(instance:fetch())

        -- add all dependent packages info to option
        local orderdeps = instance:orderdeps()
        if orderdeps then
            local total = #orderdeps
            for idx, _ in ipairs(orderdeps) do
                local dep = orderdeps[total + 1 - idx]
                if dep then
                    opt:add((dep:fetch()))
                end
            end
        end
    end

    -- update option info to the cache file
    opt:save()
end

-- attach all packages to targets
function _attach_to_targets(packages)

    for _, instance in ipairs(packages) do
        if instance:kind() ~= "binary" then
            local opt = project.option(instance:alias() or instance:name())
            if opt and opt:enabled() then
                _attach_to_option(instance, opt)
            end
        end
    end
end

-- check missing packages
function _check_missing_packages(packages)

    -- get all missing packages
    local packages_missing = {}
    local optional_missing = {}
    for _, instance in ipairs(packages) do
        if not instance:exists() and (#instance:urls() > 0 or instance:from("system")) then
            if instance:optional() then
                optional_missing[instance:name()] = instance
            else
                table.insert(packages_missing, instance:name())
            end
        end
    end

    -- raise tips
    if #packages_missing > 0 then
        raise("The packages(%s) not found!", table.concat(packages_missing, ", "))
    end

    -- save the optional missing packages
    _g.optional_missing = optional_missing
end

-- install packages
function main(requires)

    -- avoid to run this task repeatly
    if _g.installed then return end
    _g.installed = true

    -- init requires
    local requires_extra = nil
    if not requires then
        requires, requires_extra = project.requires()
    end
    if not requires or #requires == 0 then
        return 
    end

    -- get extra info
    local extra =  option.get("extra")
    local extrainfo = nil
    if extra then
        local tmpfile = os.tmpfile() .. ".lua"
        io.writefile(tmpfile, "{" .. extra .. "}")
        extrainfo = io.load(tmpfile)
        os.tryrm(tmpfile)
    end

    -- force to use the given requires extra info
    if extrainfo then
        requires_extra = requires_extra or {}
        for _, require_str in ipairs(requires) do
            requires_extra[require_str] = extrainfo
        end
    end

    -- enter environment 
    environment.enter()

    -- pull all repositories first if not exists
    --
    -- attempt to install git from the builtin-packages first if git not found
    --
    if find_tool("git") and not repository.pulled() then
        task.run("repo", {update = true})
    end

    -- install packages
    local packages = package.install_packages(requires, {requires_extra = requires_extra})
    if packages then

        -- check missing packages
        _check_missing_packages(packages)

        -- attach required local package to targets
        _attach_to_targets(packages)
    end

    -- leave environment
    environment.leave()
end