/*
 * Copyright (c) 2018-2020 Atmosphère-NX
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#pragma once
#include <vapours.hpp>
#include <stratosphere/os.hpp>

namespace ams::fssystem::buffers {

    namespace impl {

        constexpr inline auto RetryWait = TimeSpan::FromMilliSeconds(10);

    }

    template<typename F, typename OnFailure>
    Result DoContinuouslyUntilBufferIsAllocated(F f, OnFailure on_failure, const char *function_name) {
        constexpr auto BufferAllocationRetryLogCountMax = 10;
        constexpr auto BufferAllocationRetryLogInterval = 100;
        for (auto count = 1; true; count++) {
            R_TRY_CATCH(f()) {
                R_CATCH(fs::ResultBufferAllocationFailed) {
                    if ((1 <= count && count <= BufferAllocationRetryLogCountMax) || ((count % BufferAllocationRetryLogInterval) == 0)) {
                        /* TODO: Log */
                    }
                    R_TRY(on_failure());

                    /* TODO: os::SleepThread */
                    svc::SleepThread(impl::RetryWait.GetNanoSeconds());

                    continue;
                }
            } R_END_TRY_CATCH;

            return ResultSuccess();
        }
    }

    template<typename F>
    Result DoContinuouslyUntilBufferIsAllocated(F f, const char *function_name) {
        R_TRY(DoContinuouslyUntilBufferIsAllocated(f, []() ALWAYS_INLINE_LAMBDA { return ResultSuccess(); }, function_name));
        return ResultSuccess();
    }

    class BufferManagerContext {
        private:
            bool needs_blocking;
        public:
            constexpr BufferManagerContext() : needs_blocking(false) { /* ... */ }
        public:
            bool IsNeedBlocking() const { return this->needs_blocking; }

            void SetNeedBlocking(bool need) { this->needs_blocking = need; }
    };

    void RegisterBufferManagerContext(const BufferManagerContext *context);
    BufferManagerContext *GetBufferManagerContext();
    void EnableBlockingBufferManagerAllocation();

    class ScopedBufferManagerContextRegistration {
        private:
            BufferManagerContext cur_context;
            const BufferManagerContext *old_context;
        public:
            ALWAYS_INLINE explicit ScopedBufferManagerContextRegistration() {
                this->old_context = GetBufferManagerContext();
                if (this->old_context != nullptr) {
                    this->cur_context = *this->old_context;
                }
                RegisterBufferManagerContext(std::addressof(this->cur_context));
            }

            ALWAYS_INLINE ~ScopedBufferManagerContextRegistration() {
                RegisterBufferManagerContext(this->old_context);
            }
    };

}