--!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        nvcc.lua
--

-- imports
import("core.base.option")
import("core.project.config")
import("core.project.project")
import("core.language.language")
import("detect.tools.find_ccache")

-- init it
function init(self)

    -- init flags
    _g.cuflags = {}
    _g.ldflags = {}
    _g.shflags = { "-shared", "-fPIC" }

    -- init cuflags for the kind: shared
    _g.shared          = {}
    _g.shared.cuflags  = {"-fPIC"}

    -- init flags map
    _g.mapflags = 
    {
        -- warnings
        ["-W1"] = "-Wall"
    ,   ["-W2"] = "-Wall"
    ,   ["-W3"] = "-Wall"

         -- strip
    ,   ["-s"]  = "-s"
    ,   ["-S"]  = "-S"
    }

    -- init buildmodes
    _g.buildmodes = 
    {
        ["object:sources"] = false
    }
end

-- get the property
function get(self, name)
    return _g[name]
end

-- make the strip flag
function nf_strip(self, level)

    -- the maps
    local maps = 
    {   
        debug = "-S"
    ,   all   = "-s"
    }

    -- for macho target
    local plat = config.plat()
    if plat == "macosx" or plat == "iphoneos" then
        maps.all   = "-Wl,-x"
        maps.debug = "-Wl,-S"
    end

    -- make it
    return maps[level]
end

-- make the symbol flag
function nf_symbol(self, level)

    -- the maps
    local maps = 
    {   
        debug  = "-g"
    ,   hidden = "-fvisibility=hidden"
    }

    -- make it
    return maps[level] 
end

-- make the warning flag
function nf_warning(self, level)

    -- the maps
    local maps = 
    {   
        none  = "-w"
    ,   less  = "-W1"
    ,   more  = "-W3"
    ,   all   = "-Wall"
    ,   error = "-Werror"
    }

    -- make it
    return maps[level]
end

-- make the optimize flag
function nf_optimize(self, level)

    -- the maps
    local maps = 
    {   
        none       = "-O0"
    ,   fast       = "-O1"
    ,   faster     = "-O2"
    ,   fastest    = "-O3"
    ,   smallest   = "-Os"
    ,   aggressive = "-Ofast"
    }

    -- make it
    return maps[level] 
end

-- make the define flag
function nf_define(self, macro)
    return "-D" .. macro
end

-- make the undefine flag
function nf_undefine(self, macro)
    return "-U" .. macro
end

-- make the includedir flag
function nf_includedir(self, dir)
    return "-I" .. os.args(dir)
end

-- make the link flag
function nf_link(self, lib)
    return "-l" .. lib
end

-- make the linkdir flag
function nf_linkdir(self, dir)
    return "-L" .. os.args(dir)
end

-- make the rpathdir flag
function nf_rpathdir(self, dir)
    if self:has_flags("-Wl,-rpath=" .. dir) then
        return "-Wl,-rpath=" .. os.args(dir:gsub("@[%w_]+", function (name)
            local maps = {["@loader_path"] = "$ORIGIN", ["@executable_path"] = "$ORIGIN"}
            return maps[name]
        end))
    elseif self:has_flags("-Xlinker -rpath -Xlinker " .. dir) then
        return "-Xlinker -rpath -Xlinker " .. os.args(dir:gsub("%$ORIGIN", "@loader_path"))
    end
end

-- make the c precompiled header flag
function nf_pcheader(self, pcheaderfile, target)
    return "-include " .. os.args(pcheaderfile)
end

-- make the c++ precompiled header flag
function nf_pcxxheader(self, pcheaderfile, target)
    return "-include " .. os.args(pcheaderfile)
end

-- make the link arguments list
function linkargv(self, objectfiles, targetkind, targetfile, flags)

    -- add rpath for dylib (macho), .e.g -install_name @rpath/file.dylib
    local flags_extra = {}
    if targetkind == "shared" and targetfile:endswith(".dylib") then
        table.insert(flags_extra, "-install_name")
        table.insert(flags_extra, "@rpath/" .. path.filename(targetfile))
    end

    -- add `-Wl,--out-implib,outputdir/libxxx.a` for xxx.dll on mingw/gcc
    if targetkind == "shared" and config.plat() == "mingw" then
        table.insert(flags_extra, "-Wl,--out-implib," .. os.args(path.join(path.directory(targetfile), path.basename(targetfile) .. ".a")))
    end

    -- make link args
    return self:program(), table.join("-o", targetfile, objectfiles, flags, flags_extra)
end

-- link the target file
function link(self, objectfiles, targetkind, targetfile, flags)

    -- ensure the target directory
    os.mkdir(path.directory(targetfile))

    -- link it
    os.runv(linkargv(self, objectfiles, targetkind, targetfile, flags))
end

-- make the complie arguments list
function _compargv1(self, sourcefile, objectfile, flags)

    -- get ccache
    local ccache = nil
    if config.get("ccache") then
        ccache = find_ccache()
    end

    -- make argv
    local argv = table.join("-c", flags, "-o", objectfile, sourcefile)

    -- uses cache?
    local program = self:program()
    if ccache then
            
        -- parse the filename and arguments, .e.g "xcrun -sdk macosx clang"
        if not os.isexec(program) then
            argv = table.join(program:split("%s"), argv)
        else 
            table.insert(argv, 1, program)
        end
        return ccache, argv
    end

    -- no cache
    return program, argv
end

-- complie the source file
function _compile1(self, sourcefile, objectfile, dependinfo, flags)

    -- ensure the object directory
    os.mkdir(path.directory(objectfile))

    -- compile it
    try
    {
        function ()
            local outdata, errdata = os.iorunv(_compargv1(self, sourcefile, objectfile, flags))
            return (outdata or "") .. (errdata or "")
        end,
        catch
        {
            function (errors)

                -- try removing the old object file for forcing to rebuild this source file
                os.tryrm(objectfile)

                -- find the start line of error
                local lines = errors:split("\n")
                local start = 0
                for index, line in ipairs(lines) do
                    if line:find("error:", 1, true) or line:find("错误：", 1, true) then
                        start = index
                        break
                    end
                end

                -- get 16 lines of errors
                if start > 0 or not option.get("verbose") then
                    if start == 0 then start = 1 end
                    errors = table.concat(table.slice(lines, start, start + ifelse(#lines - start > 16, 16, #lines - start)), "\n")
                end

                -- raise compiling errors
                raise(errors)
            end
        },
        finally
        {
            function (ok, warnings)

                -- print some warnings
                if warnings and #warnings > 0 and (option.get("verbose") or option.get("warning")) then
                    cprint("${yellow}%s", table.concat(table.slice(warnings:split('\n'), 1, 8), '\n'))
                end
            end
        }
    }
end

-- make the complie arguments list
function compargv(self, sourcefiles, objectfile, flags)

    -- only support single source file now
    assert(type(sourcefiles) ~= "table", "'object:sources' not support!")

    -- for only single source file
    return _compargv1(self, sourcefiles, objectfile, flags)
end

-- complie the source file
function compile(self, sourcefiles, objectfile, dependinfo, flags)

    -- only support single source file now
    assert(type(sourcefiles) ~= "table", "'object:sources' not support!")

    -- for only single source file
    _compile1(self, sourcefiles, objectfile, dependinfo, flags)
end