#pragma once

#include "sys_sync.h"

// Event Queue Type
enum : u32
{
	SYS_PPU_QUEUE = 1,
	SYS_SPU_QUEUE = 2,
};

// Event Queue Destroy Mode
enum : s32
{
	SYS_EVENT_QUEUE_DESTROY_FORCE = 1,
};

// Event Queue Ipc Key
enum : u64
{
	SYS_EVENT_QUEUE_LOCAL = 0,
};

// Event Port Type
enum : s32
{
	SYS_EVENT_PORT_LOCAL = 1,
};

// Event Port Name
enum : u64
{
	SYS_EVENT_PORT_NO_NAME = 0,
};

// Event Source Type
enum : u32
{
	SYS_SPU_THREAD_EVENT_USER = 1,
	SYS_SPU_THREAD_EVENT_DMA  = 2, // not supported
};

// Event Source Key
enum : u64
{
	SYS_SPU_THREAD_EVENT_USER_KEY      = 0xFFFFFFFF53505501ull,
	SYS_SPU_THREAD_EVENT_DMA_KEY       = 0xFFFFFFFF53505502ull,
	SYS_SPU_THREAD_EVENT_EXCEPTION_KEY = 0xFFFFFFFF53505503ull,
};

struct sys_event_queue_attribute_t
{
	be_t<u32> protocol; // SYS_SYNC_PRIORITY or SYS_SYNC_FIFO
	be_t<s32> type; // SYS_PPU_QUEUE or SYS_SPU_QUEUE
	char name[8];
};

struct sys_event_t
{
	be_t<u64> source;
	be_t<u64> data1;
	be_t<u64> data2;
	be_t<u64> data3;
};

class lv2_event_queue_t final
{
	// Tuple elements: source, data1, data2, data3
	using event_type = std::tuple<u64, u64, u64, u64>;

	std::deque<event_type> m_events;

	sleep_queue<cpu_thread> m_sq;

public:
	// Try to make an event queue with specified global key
	static std::shared_ptr<lv2_event_queue_t> make(u32 protocol, s32 type, u64 name, u64 ipc_key, s32 size);

	// Get event queue by its global key
	static std::shared_ptr<lv2_event_queue_t> find(u64 ipc_key);

	const u32 protocol;
	const s32 type;
	const u64 name;
	const u64 ipc_key;
	const s32 size;

	const id_value<> id{};

	lv2_event_queue_t(u32 protocol, s32 type, u64 name, u64 ipc_key, s32 size)
		: protocol(protocol)
		, type(type)
		, name(name)
		, ipc_key(ipc_key)
		, size(size)
	{
	}

	// Send an event
	void push(lv2_lock_t, u64 source, u64 data1, u64 data2, u64 data3);

	// Receive an event (queue shouldn't be empty)
	event_type pop(lv2_lock_t);

	// Remove all events
	void clear(lv2_lock_t)
	{
		m_events.clear();
	}

	// Get event count
	std::size_t events() const { return m_events.size(); }

	// Get waiter count
	std::size_t waiters() const { return m_sq.size(); }

	// Get threads (TODO)
	auto& thread_queue(lv2_lock_t) { return m_sq; }
};

struct lv2_event_port_t
{
	const s32 type; // port type, must be SYS_EVENT_PORT_LOCAL
	const u64 name; // passed as event source (generated from id and process id if not set)

	std::weak_ptr<lv2_event_queue_t> queue; // event queue this port is connected to

	lv2_event_port_t(s32 type, u64 name)
		: type(type)
		, name(name)
	{
	}
};

class PPUThread;

// SysCalls
s32 sys_event_queue_create(vm::ptr<u32> equeue_id, vm::ptr<sys_event_queue_attribute_t> attr, u64 event_queue_key, s32 size);
s32 sys_event_queue_destroy(u32 equeue_id, s32 mode);
s32 sys_event_queue_receive(PPUThread& ppu, u32 equeue_id, vm::ptr<sys_event_t> dummy_event, u64 timeout);
s32 sys_event_queue_tryreceive(u32 equeue_id, vm::ptr<sys_event_t> event_array, s32 size, vm::ptr<u32> number);
s32 sys_event_queue_drain(u32 event_queue_id);

s32 sys_event_port_create(vm::ptr<u32> eport_id, s32 port_type, u64 name);
s32 sys_event_port_destroy(u32 eport_id);
s32 sys_event_port_connect_local(u32 event_port_id, u32 event_queue_id);
s32 sys_event_port_disconnect(u32 eport_id);
s32 sys_event_port_send(u32 event_port_id, u64 data1, u64 data2, u64 data3);