#include "locks.hfa"
#include "kernel_private.hfa"
#include <stdlib.h>
#include <stdio.h>

#include <kernel.hfa>
#include <stdlib.hfa>
#include <thread.hfa>

///////////////////////////////////////////////////////////////////
//// info_thread
///////////////////////////////////////////////////////////////////
forall(dtype L | is_blocking_lock(L)) {
	void ?{}( info_thread(L) & this, $thread * t ) {
		this.t = t;
		this.lock = 0p;
		this.listed = false;
	}

	void ?{}( info_thread(L) & this, $thread * t, uintptr_t info ) {
		this.t = t;
		this.info = info;
		this.lock = 0p;
		this.listed = false;
	}

	void ^?{}( info_thread(L) & this ){
		// default
	}

	info_thread(L) *& get_next( info_thread(L) & this ) {
		return this.next;
	}
}
///////////////////////////////////////////////////////////////////
//// Blocking Locks
///////////////////////////////////////////////////////////////////

void ?{}( blocking_lock & this, bool multi_acquisition, bool strict_owner ) {
	this.lock{};
	this.blocked_threads{};
	this.wait_count = 0;
	this.multi_acquisition = multi_acquisition;
	this.strict_owner = strict_owner;
	this.owner = 0p;
	this.recursion_count = 0;
}

void ^?{}( blocking_lock & this ) {
	// default
}

void ?{}( single_acquisition_lock & this ) {
	((blocking_lock &)this){ false, false };
}

void ^?{}( single_acquisition_lock & this ) {
	// default
}

void ?{}( owner_lock & this ) {
	((blocking_lock &)this){ true, true };
}

void ^?{}( owner_lock & this ) {
	// default
}

void ?{}( multiple_acquisition_lock & this ) {
	((blocking_lock &)this){ true, false };
}

void ^?{}( multiple_acquisition_lock & this ) {
	// default
}

void lock( blocking_lock & this ) with( this ) {
	lock( lock __cfaabi_dbg_ctx2 );
	if ( owner == active_thread() && !multi_acquisition) {
		fprintf(stderr, "A single acquisition lock holder attempted to reacquire the lock resulting in a deadlock."); // Possibly throw instead
    	exit(EXIT_FAILURE);
	} else if ( owner != 0p && owner != active_thread() ) {
		append( blocked_threads, active_thread() );
		wait_count++;
		unlock( lock );
		park( );
	} else if ( owner == active_thread() && multi_acquisition ) {
		recursion_count++;
		unlock( lock );
	} else {
		owner = active_thread();
		recursion_count = 1;
		unlock( lock );
	}
}

bool try_lock( blocking_lock & this ) with( this ) {
	bool ret = false;
	lock( lock __cfaabi_dbg_ctx2 );
	if ( owner == 0p ) {
		owner = active_thread();
		recursion_count = 1;
		ret = true;
	} else if ( owner == active_thread() && multi_acquisition ) {
		recursion_count++;
		ret = true;
	}
	unlock( lock );
	return ret;
}

void unlock( blocking_lock & this ) with( this ) {
	lock( lock __cfaabi_dbg_ctx2 );
	if ( owner == 0p ){ // no owner implies lock isn't held
		fprintf( stderr, "There was an attempt to release a lock that isn't held" ); 
		return;
	} else if ( strict_owner && owner != active_thread() ) {
		fprintf( stderr, "A thread other than the owner attempted to release an owner lock" ); 
		return;
	}
	recursion_count--;
	if ( recursion_count == 0 ) {
		$thread * thrd = pop_head( blocked_threads );
		owner = thrd;
		recursion_count = ( thrd ? 1 : 0 );
		wait_count--;
		unpark( thrd );
	}
	unlock( lock );
}

size_t wait_count( blocking_lock & this ) with( this ) {
	return wait_count;
}


void set_recursion_count( blocking_lock & this, size_t recursion ) with( this ) {
	recursion_count = recursion;
}

size_t get_recursion_count( blocking_lock & this ) with( this ) {
	return recursion_count;
}

void add_( blocking_lock & this, $thread * t ) with( this ) {
    lock( lock __cfaabi_dbg_ctx2 );
	if ( owner != 0p ) {
		append( blocked_threads, t );
		wait_count++;
		unlock( lock );
	} else {
		owner = t;
		recursion_count = 1;
		#if !defined( __CFA_NO_STATISTICS__ )
			//kernelTLS.this_stats = t->curr_cluster->stats;
		#endif
		unpark( t );
		unlock( lock );
	}
}

void remove_( blocking_lock & this ) with( this ) {
    lock( lock __cfaabi_dbg_ctx2 );
	if ( owner == 0p ){ // no owner implies lock isn't held
		fprintf( stderr, "A lock that is not held was passed to a synchronization lock" ); 
	} else if ( strict_owner && owner != active_thread() ) {
		fprintf( stderr, "A thread other than the owner of a lock passed it to a synchronization lock" ); 
	} else {
		$thread * thrd = pop_head( blocked_threads );
		owner = thrd;
		recursion_count = ( thrd ? 1 : 0 );
		wait_count--;
		unpark( thrd );
	}
	unlock( lock );
}

///////////////////////////////////////////////////////////////////
//// Overloaded routines for traits
///////////////////////////////////////////////////////////////////

// This is temporary until an inheritance bug is fixed

void lock( single_acquisition_lock & this ){
	lock( (blocking_lock &)this );
}

void unlock( single_acquisition_lock & this ){
	unlock( (blocking_lock &)this );
}

void add_( single_acquisition_lock & this, struct $thread * t ){
	add_( (blocking_lock &)this, t );
}

void remove_( single_acquisition_lock & this ){
	remove_( (blocking_lock &)this );
}

void set_recursion_count( single_acquisition_lock & this, size_t recursion ){
	set_recursion_count( (blocking_lock &)this, recursion );
}

size_t get_recursion_count( single_acquisition_lock & this ){
	return get_recursion_count( (blocking_lock &)this );
}

void lock( owner_lock & this ){
	lock( (blocking_lock &)this );
}

void unlock( owner_lock & this ){
	unlock( (blocking_lock &)this );
}

void add_( owner_lock & this, struct $thread * t ){
	add_( (blocking_lock &)this, t );
}

void remove_( owner_lock & this ){
	remove_( (blocking_lock &)this );
}

void set_recursion_count( owner_lock & this, size_t recursion ){
	set_recursion_count( (blocking_lock &)this, recursion );
}

size_t get_recursion_count( owner_lock & this ){
	return get_recursion_count( (blocking_lock &)this );
}

void lock( multiple_acquisition_lock & this ){
	lock( (blocking_lock &)this );
}

void unlock( multiple_acquisition_lock & this ){
	unlock( (blocking_lock &)this );
}

void add_( multiple_acquisition_lock & this, struct $thread * t ){
	add_( (blocking_lock &)this, t );
}

void remove_( multiple_acquisition_lock & this ){
	remove_( (blocking_lock &)this );
}

void set_recursion_count( multiple_acquisition_lock & this, size_t recursion ){
	set_recursion_count( (blocking_lock &)this, recursion );
}

size_t get_recursion_count( multiple_acquisition_lock & this ){
	return get_recursion_count( (blocking_lock &)this );
}

///////////////////////////////////////////////////////////////////
//// condition variable
///////////////////////////////////////////////////////////////////

forall(dtype L | is_blocking_lock(L)) {

	void timeout_handler ( alarm_node_wrap(L) & this ) with( this ) {
    	// This condition_variable member is called from the kernel, and therefore, cannot block, but it can spin.
	    lock( cond->lock __cfaabi_dbg_ctx2 );
	    if ( (*i)->listed ) {			// is thread on queue
	    	info_thread(L) * copy = *i;
			remove( cond->blocked_threads, i );		 //remove this thread O(1)
			cond->count--;
			if( !copy->lock ) {
				#if !defined( __CFA_NO_STATISTICS__ )
					//kernelTLS.this_stats = copy->t->curr_cluster->stats;
				#endif
				unpark( copy->t );
	    	} else {
	    		add_(*copy->lock, copy->t);			// call lock's add_
	    	}
	    }
	    unlock( cond->lock );
	}

	void alarm_node_wrap_cast( alarm_node_t & a ) {
		timeout_handler( (alarm_node_wrap(L) &)a );
	}

	void ?{}( condition_variable(L) & this ){
		this.lock{};
		this.blocked_threads{};
		this.count = 0;
	}

	void ^?{}( condition_variable(L) & this ){
		// default
	}

	void ?{}( alarm_node_wrap(L) & this, $thread * thrd, Time alarm, Duration period, Alarm_Callback callback ) {
		this.alarm_node{ thrd, alarm, period, callback };
	}

	void ^?{}( alarm_node_wrap(L) & this ) {
		// default
	}

	bool notify_one( condition_variable(L) & this ) with( this ) {
		lock( lock __cfaabi_dbg_ctx2 );
		bool ret = !!blocked_threads;
		info_thread(L) * popped = pop_head( blocked_threads );
		if(popped != 0p) {
			popped->listed = false;
			count--;
			if (popped->lock) {
				add_(*popped->lock, popped->t);
			} else {
				unpark(popped->t);
			}
		}
		unlock( lock );
		return ret;
	}

	bool notify_all( condition_variable(L) & this ) with(this) {
		lock( lock __cfaabi_dbg_ctx2 );
		bool ret = blocked_threads ? true : false;
		while( blocked_threads ) {
			info_thread(L) * popped = pop_head( blocked_threads );
			if(popped != 0p){
				popped->listed = false;
				count--;
				if (popped->lock) {
					add_(*popped->lock, popped->t);
				} else {
					unpark(popped->t);
				}
			}
		}
		unlock( lock );
		return ret;
	}

	uintptr_t front( condition_variable(L) & this ) with(this) {
		if(!blocked_threads) return NULL;
		return peek(blocked_threads)->info;
	}

	bool empty( condition_variable(L) & this ) with(this) {
		return blocked_threads ? false : true;
	}

	int counter( condition_variable(L) & this ) with(this) {
		return count;
	}

	// helper for wait()'s' without a timeout
	void queue_info_thread( condition_variable(L) & this, info_thread(L) & i ) with(this) {
		lock( lock __cfaabi_dbg_ctx2 );
		append( this.blocked_threads, &i );
		count++;
		i.listed = true;
		size_t recursion_count;
		if (i.lock) {
			recursion_count = get_recursion_count(*i.lock);
			remove_( *i.lock );
		}
		
		unlock( lock );
		park( ); // blocks here

		if (i.lock) set_recursion_count(*i.lock, recursion_count); // resets recursion count here after waking
	}

	// helper for wait()'s' with a timeout
	void queue_info_thread_timeout( condition_variable(L) & this, info_thread(L) & info, Time t ) with(this) {
		lock( lock __cfaabi_dbg_ctx2 );

		info_thread(L) * queue_ptr = &info;

		alarm_node_wrap(L) node_wrap = { info.t, t, 0`s, alarm_node_wrap_cast };
		node_wrap.cond = &this;
		node_wrap.i = &queue_ptr;

		register_self( &node_wrap.alarm_node );

		append( blocked_threads, queue_ptr );
		info.listed = true;
		count++;

		size_t recursion_count;
		if (info.lock) {
			recursion_count = get_recursion_count(*info.lock);
			remove_( *info.lock );
		}

		unlock( lock );
		park();

		if (info.lock) set_recursion_count(*info.lock, recursion_count);
	}

	void wait( condition_variable(L) & this ) with(this) {
		info_thread( L ) i = { active_thread() };
		queue_info_thread( this, i );
	}

	void wait( condition_variable(L) & this, uintptr_t info ) with(this) {
		info_thread( L ) i = { active_thread(), info };
		queue_info_thread( this, i );
	}
	
	void wait( condition_variable(L) & this, Duration duration ) with(this) {
		info_thread( L ) i = { active_thread() };
		queue_info_thread_timeout(this, i, __kernel_get_time() + duration );
	}

	void wait( condition_variable(L) & this, uintptr_t info, Duration duration ) with(this) { 
		info_thread( L ) i = { active_thread(), info };
		queue_info_thread_timeout(this, i, __kernel_get_time() + duration );
	}

	void wait( condition_variable(L) & this, Time time ) with(this) {
		info_thread( L ) i = { active_thread() };
		queue_info_thread_timeout(this, i, time);
	}

	void wait( condition_variable(L) & this, uintptr_t info, Time time ) with(this) {
		info_thread( L ) i = { active_thread(), info };
		queue_info_thread_timeout(this, i, time);
	}

	void wait( condition_variable(L) & this, L & l ) with(this) {
		info_thread(L) i = { active_thread() };
		i.lock = &l;
		queue_info_thread( this, i );
	}

	void wait( condition_variable(L) & this, L & l, uintptr_t info ) with(this) {
		info_thread(L) i = { active_thread(), info };
		i.lock = &l;
		queue_info_thread( this, i );
	}
	
	void wait( condition_variable(L) & this, L & l, Duration duration ) with(this) {
		info_thread(L) i = { active_thread() };
		i.lock = &l;
		queue_info_thread_timeout(this, i, __kernel_get_time() + duration );
	}
	
	void wait( condition_variable(L) & this, L & l, uintptr_t info, Duration duration ) with(this) {
		info_thread(L) i = { active_thread(), info };
		i.lock = &l;
		queue_info_thread_timeout(this, i, __kernel_get_time() + duration );
	}
	
	void wait( condition_variable(L) & this, L & l, Time time ) with(this) {
		info_thread(L) i = { active_thread() };
		i.lock = &l;
		queue_info_thread_timeout(this, i, time );
	}
	
	void wait( condition_variable(L) & this, L & l, uintptr_t info, Time time ) with(this) {
		info_thread(L) i = { active_thread(), info };
		i.lock = &l;
		queue_info_thread_timeout(this, i, time );
	}
}

// thread T1 {};
// thread T2 {};

// multiple_acquisition_lock m;
// condition_variable( multiple_acquisition_lock ) c;

// void main( T1 & this ) {
// 	printf("T1 start\n");
// 	lock(m);
// 	printf("%d\n", counter(c));
// 	if(empty(c)) {
// 		printf("T1 wait\n");
// 		wait(c,m,12);
// 	}else{
// 		printf("%d\n", front(c));
// 		notify_one(c);
// 	}
// 	unlock(m);
// 	printf("curr thd in main %p \n", active_thread());
// 	printf("T1 waits for 2s\n");
// 	lock(m);
// 	wait( c, m, 2`s );
// 	unlock(m);
// 	printf("T1 wakes\n");
// 	printf("T1 done\n");
// }

// void main( T2 & this ) {
// 	printf("T2 start\n");
// 	lock(m);
// 	printf("%d\n", counter(c));
// 	if(empty(c)) {
// 		printf("T2 wait\n");
// 		wait(c,m,12);
// 	}else{
// 		printf("%d\n", front(c));
// 		notify_one(c);
// 	}
// 	unlock(m);
// 	printf("T2 done\n");
// }

// int main() {
// 	printf("start\n");
// 	processor p[2];
// 	{
// 		T1 t1;
// 		T2 t2;
// 	}
// 	printf("done\n");
// }