--!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        find_qt.lua
--

-- imports
import("lib.detect.find_file")
import("lib.detect.find_tool")
import("core.base.semver")
import("core.base.option")
import("core.base.global")
import("core.project.config")
import("core.cache.detectcache")

-- find qt sdk directory
function _find_sdkdir(sdkdir, sdkver)

    -- append target sub-directory
    local subdirs = {}
    if is_plat("linux") then
        table.insert(subdirs, path.join(sdkver or "*", is_arch("x86_64") and "gcc_64" or "gcc_32", "bin"))
        table.insert(subdirs, path.join(sdkver or "*", is_arch("x86_64") and "clang_64" or "clang_32", "bin"))
    elseif is_plat("macosx") then
        table.insert(subdirs, path.join(sdkver or "*", "macos", "bin")) -- for Qt 6.2
        table.insert(subdirs, path.join(sdkver or "*", is_arch("x86_64") and "clang_64" or "clang_32", "bin"))
    elseif is_plat("iphoneos") then
        table.insert(subdirs, path.join(sdkver or "*", "ios", "bin"))
    elseif is_plat("windows") then
        local vs = config.get("vs")
        if vs then
            table.insert(subdirs, path.join(sdkver or "*", is_arch("x64") and "msvc" .. vs .. "_64" or "msvc" .. vs .. "_32", "bin"))
            table.insert(subdirs, path.join(sdkver or "*", "msvc" .. vs, "bin"))
        end
        table.insert(subdirs, path.join(sdkver or "*", is_arch("x64") and "msvc*_64" or "msvc*_32", "bin"))
        table.insert(subdirs, path.join(sdkver or "*", "msvc*", "bin"))
    elseif is_plat("mingw") then
        table.insert(subdirs, path.join(sdkver or "*", is_arch("x86_64") and "mingw*_64" or "mingw*_32", "bin"))
    elseif is_plat("android") then
        local subdir
        if is_arch("arm64-v8a") then
            subdir = "android_arm64_v8a"
        elseif is_arch("armeabi-v7a", "armeabi", "armv7-a", "armv5te") then -- armv7-a/armv5te are deprecated
            subdir = "android_armv7"
        elseif is_arch("x86", "i386") then -- i386 is deprecated
            subdir = "android_x86"
        elseif is_arch("x86_64") then
            subdir = "android_x86_64"
        end
        if subdir then
            table.insert(subdirs, path.join(sdkver or "*", subdir, "bin"))
        end
        table.insert(subdirs, path.join(sdkver or "*", "android", "bin"))
    elseif is_plat("wasm") then
        table.insert(subdirs, path.join(sdkver or "*", "wasm_*", "bin"))
    else
        table.insert(subdirs, path.join(sdkver or "*", "*", "bin"))
    end
    table.insert(subdirs, path.join("*", "bin"))
    table.insert(subdirs, "bin")

    -- init the search directories
    local paths = {}
    if sdkdir then
        table.insert(paths, sdkdir)
    end
    if is_host("windows") then

        -- we find it from /mingw64 first
        if is_subhost("msys") then
            local mingw_prefix = os.getenv("MINGW_PREFIX")
            if mingw_prefix and os.isdir(mingw_prefix) then
                table.insert(paths, mingw_prefix)
            end
        end

        -- add paths from registry
        local regs =
        {
            "HKEY_CLASSES_ROOT\\Applications\\QtProject.QtCreator.c\\shell\\Open\\Command",
            "HKEY_CLASSES_ROOT\\Applications\\QtProject.QtCreator.cpp\\shell\\Open\\Command",
            "HKEY_CLASSES_ROOT\\Applications\\QtProject.QtCreator.pro\\shell\\Open\\Command",
            "HKEY_CURRENT_USER\\SOFTWARE\\Classes\\Applications\\QtProject.QtCreator.c\\shell\\Open\\Command",
            "HKEY_CURRENT_USER\\SOFTWARE\\Classes\\Applications\\QtProject.QtCreator.cpp\\shell\\Open\\Command",
            "HKEY_CURRENT_USER\\SOFTWARE\\Classes\\Applications\\QtProject.QtCreator.pro\\shell\\Open\\Command"
        }
        for _, reg in ipairs(regs) do
            table.insert(paths, function ()
                local value = val("reg " .. reg)
                if value then
                    local p = value:find("\\Tools\\QtCreator", 1, true)
                    if p then
                        return path.translate(value:sub(1, p - 1))
                    end
                end
            end)
        end

        -- add root logical drive pates, e.g. C:/Qt/Qtx.x.x, D:/Qtx.x.x ..
        for idx, drive in ipairs(winos.logical_drives()) do
            if idx < 5 then
                table.insert(paths, path.join(drive, "Qt", "Qt*"))
            else
                break
            end
        end
    else
        for _, dir in ipairs(os.dirs("~/Qt*")) do
            table.insert(paths, dir)
        end
    end

    -- special case for android on windows, where qmake is a .bat from version 6.3
    -- this case also applys to wasm
    if is_host("windows") and is_plat("android", "wasm") then
        local qmake = find_file("qmake.bat", paths, {suffixes = subdirs})
        if qmake then
            return path.directory(path.directory(qmake)), qmake
        end
    end

    -- attempt to find qmake
    local qmake
    if is_host("windows") then
        qmake = find_file("qmake.exe", paths, {suffixes = subdirs})
    else
        -- @see https://github.com/xmake-io/xmake/issues/4881
        if sdkver then
            local major = sdkver:sub(1, 1)
            local suffixes = {major, "-" .. major, "-qt" .. major, ""}
            for _, suffix in ipairs(suffixes) do
                qmake = find_file("qmake" .. suffix, paths, {suffixes = subdirs})
                if qmake then
                    break
                end
            end
        end
        if not qmake then
            qmake = find_file("qmake", paths, {suffixes = subdirs})
        end
    end
    if qmake then
        return path.directory(path.directory(qmake)), qmake
    end
end

-- find qmake
function _find_qmake(sdkdir, sdkver)

    -- we attempt to find qmake from qt sdkdir first
    local sdkdir, qmakefile = _find_sdkdir(sdkdir, sdkver)
    if qmakefile then
        return qmakefile
    end

    -- try finding qmake with the specific version, e.g. /usr/bin/qmake6
    -- https://github.com/xmake-io/xmake/pull/3555
    local qmake
    if sdkver then
        sdkver = semver.try_parse(sdkver)
        if sdkver then
            local major = sdkver:major()
            local suffixes = {major, "-" .. major, "-qt" .. major}
            for _, suffix in ipairs(suffixes) do
                local cachekey = "qmake" .. suffix
                qmake = find_tool("qmake", {program = cachekey, cachekey = cachekey, paths = sdkdir and path.join(sdkdir, "bin")})
                if qmake then
                    break
                end
            end
        end
    end

    -- we need to find the default qmake in current system
    -- maybe we only installed qmake6
    if not qmake then
        local suffixes = {"", "6", "-6", "-qt6", "5", "-5", "-qt5"}
        for _, suffix in ipairs(suffixes) do
            local cachekey = "qmake" .. suffix
            qmake = find_tool("qmake", {program = cachekey, cachekey = cachekey, paths = sdkdir and path.join(sdkdir, "bin")})
            if qmake then
                break
            end
        end
    end
    if qmake then
        return qmake.program
    end
end

-- get qt environment
function _get_qtenvs(qmake, sdkdir)
    local envs = {}
    local results

    -- Try with -qtconf first if sdkdir is provided
    if sdkdir then
        local conf_paths = {path.join(sdkdir, "bin", "target_qt.conf"), path.join(sdkdir, "bin", "qt.conf"), path.join(sdkdir, "qt.conf")}
        for _, conf_path in ipairs(conf_paths) do
            if os.isfile(conf_path) then
                results = try {function () return os.iorunv(qmake, {"-query", "-qtconf", conf_path}) end}
                break
            end
        end
    end

    -- Fallback to normal query if sdkdir is not specified or -qtconf not applicable
    results = results or try {
        function ()
            return os.iorunv(qmake, {"-query"})
        end,
        catch {
            function (errors)
                if errors then
                    dprint(tostring(errors))
                end
            end
        }
    }
    if results then
        for _, qtenv in ipairs(results:split('\n', {plain = true})) do
            local kv = qtenv:split(':', {plain = true, limit = 2}) -- @note set limit = 2 for supporting value with win-style path, e.g. `key:C:\xxx`
            if #kv == 2 then
                envs[kv[1]] = kv[2]:trim()
            end
        end
        return envs
    end
end

-- Verify and correct the Qt SDK version for cross-compiling.
-- qmake reports its own version (QT_VERSION), not the version specified in the SDK's configuration files.
function _tryfix_sdkver_for_cross(sdkdir, sdkver)
    local qconfig_path = sdkdir and path.join(sdkdir, "mkspecs", "qconfig.pri")
    if not sdkver or not os.isfile(qconfig_path) then
        return sdkver
    end
    -- Extract the actual SDK version from qconfig.pri
    local qconfig = io.readfile(qconfig_path)
    local actual_sdkver = qconfig and qconfig:match("QT_VERSION%s*=%s*(%S+)") -- Expected format: QT_VERSION = x.y.z
    if not actual_sdkver then
        return sdkver
    end
    if sdkver ~= actual_sdkver then
        wprint("Host Qt SDK version (%s) differs from Target Qt SDK version (%s). To prevent build issues, please ensure both use the same version.", sdkver, actual_sdkver);
    end
    return actual_sdkver
end

-- find qt sdk toolchains
function _find_qt(sdkdir, sdkver, sdkdir_host)

    -- find qmake
    local qmake = _find_qmake(sdkdir_host or sdkdir, sdkver)
    if not qmake then
        return
    end

    -- get qt environments
    local located_sdkdir = sdkdir and _find_sdkdir(sdkdir, sdkver)
    local qtenvs = _get_qtenvs(qmake, located_sdkdir or sdkdir)
    if not qtenvs then
        return
    end

    -- get qt toolchains
    sdkdir = qtenvs.QT_INSTALL_PREFIX
    local sdkver = _tryfix_sdkver_for_cross(sdkdir, qtenvs.QT_VERSION)
    local bindir = qtenvs.QT_INSTALL_BINS
    local libexecdir = qtenvs.QT_INSTALL_LIBEXECS
    local qmldir = qtenvs.QT_INSTALL_QML
    local libdir = qtenvs.QT_INSTALL_LIBS
    local pluginsdir = qtenvs.QT_INSTALL_PLUGINS
    local includedir = qtenvs.QT_INSTALL_HEADERS
    local mkspecsdir = qtenvs.QMAKE_MKSPECS or path.join(qtenvs.QT_HOST_DATA, "mkspecs")
    local mkspec = qtenvs.QMAKE_XSPEC or qtenvs.QMAKE_SPEC

    -- handle qt sysroot
    local qt_sysroot = qtenvs.QT_SYSROOT or ""
    if #qt_sysroot > 0 and os.isdir(qt_sysroot) then
        sdkdir = path.join(qt_sysroot, sdkdir)
        bindir = path.join(qt_sysroot, bindir)
        libexecdir = path.join(qt_sysroot, libexecdir)
        qmldir = path.join(qt_sysroot, qmldir)
        libdir = path.join(qt_sysroot, libdir)
        pluginsdir = path.join(qt_sysroot, pluginsdir)
        includedir = path.join(qt_sysroot, includedir)
    end

    -- for 6.2
    local bindir_host = qtenvs.QT_HOST_BINS
    if not bindir_host and libexecdir and is_plat("android", "iphoneos") then
        local rootdir = path.directory(path.directory(bindir))
        if is_host("macosx") then
            bindir_host = path.join(rootdir, "macos", "bin")
        else
            -- TODO
        end
    end
    local libexecdir_host = qtenvs.QT_HOST_LIBEXECS
    if not libexecdir_host and libexecdir and is_plat("android", "iphoneos") then
        local rootdir = path.directory(path.directory(libexecdir))
        if is_host("macosx") then
            libexecdir_host = path.join(rootdir, "macos", "libexec")
        else
            -- TODO
        end
    end

    if sdkdir_host then
        local located_sdkdir_host = _find_sdkdir(sdkdir_host, sdkver)
        local qtenvs_host = _get_qtenvs(qmake, located_sdkdir_host or sdkdir_host)
        if qtenvs_host then
            bindir_host = qtenvs_host.QT_HOST_BINS or qtenvs_host.QT_INSTALL_BINS or bindir_host
            libexecdir_host = qtenvs_host.QT_HOST_LIBEXECS or qtenvs_host.QT_INSTALL_LIBEXECS or libexecdir_host
        end
    end

    return {sdkdir = sdkdir, bindir = bindir, bindir_host = bindir_host, libexecdir = libexecdir, libexecdir_host = libexecdir_host, libdir = libdir, includedir = includedir, qmldir = qmldir, pluginsdir = pluginsdir, mkspecsdir = mkspecsdir, mkspec = mkspec, sdkver = sdkver}
end

-- find qt sdk toolchains
--
-- @param sdkdir    the qt sdk directory
-- @param opt       the argument options, e.g. {verbose = true, force = false, version = "5.9.1"}
--
-- @return          the qt sdk toolchains. e.g. {sdkver = ..., sdkdir = ..., bindir = .., linkdirs = ..., includedirs = ..., .. }
--
-- @code
--
-- local toolchains = find_qt("~/Qt")
--
-- @endcode
--
-- find Qt SDK
--
-- @param sdkdir the Qt SDK directory (optional)
-- @param opt    the options, e.g. {verbose = true, force = false}
-- @return       the SDK info table {sdkdir, bindir, libdir, includedir, ...}
--
function main(sdkdir, opt)

    -- init arguments
    opt = opt or {}

    -- attempt to load cache first
    local key = "detect.sdks.find_qt"
    local cacheinfo = (sdkdir and detectcache:get2(key, sdkdir)) or detectcache:get(key) or {}
    if not opt.force and cacheinfo.qt and cacheinfo.qt.sdkdir and os.isdir(cacheinfo.qt.sdkdir) then
        return cacheinfo.qt
    end

    -- find qt
    local real_sdkdir = sdkdir or config.get("qt") or global.get("qt") or config.get("sdk")
    local sdkver = opt.version or config.get("qt_sdkver")
    local sdkdir_host = opt.sdkdir_host or config.get("qt_host") or global.get("qt_host")
    local qt = _find_qt(real_sdkdir, sdkver, sdkdir_host)
    if qt then
        config.set("qt", qt.sdkdir, {force = true, readonly = true})
        config.set("qt_sdkver", qt.sdkver, {force = true, readonly = true})

        if opt.verbose or option.get("verbose") then
            local extra = ""
            if qt.sdkver then
                extra = " (" .. qt.sdkver .. ")"
            end
            cprint("checking for Qt SDK ... ${color.success}%s%s", qt.sdkdir, extra)
        end
    else
        if opt.verbose or option.get("verbose") then
            cprint("checking for Qt SDK ... ${color.nothing}${text.nothing}")
        end
    end

    -- save to cache
    cacheinfo.qt = qt or false
    if sdkdir then
        detectcache:set2(key, sdkdir, cacheinfo)
    else
        detectcache:set(key, cacheinfo)
    end
    return qt
end