include "primitives.alh"
include "modelling.alh"
include "object_operations.alh"
include "library.alh"
include "conformance_scd.alh"
include "io.alh"
include "metamodels.alh"
include "compilation_manager.alh"

Void function main():
	Element model
	String verify_result

	while (True):
		execute_cbd(instantiate_model(import_node("models/CausalBlockDiagrams_Design")))

Element function retype_to_runtime(design_model : Element):
	Element runtime_model
	Element all_blocks
	Element all_links
	String mm_type_name
	String element_name
	String attr_name
	String attr_value
	String attribute
	String src
	String dst
	String time
	Element all_attributes

	runtime_model = instantiate_model(import_node("models/CausalBlockDiagrams_Runtime"))

	all_blocks = allInstances(design_model, "Block")
	while (list_len(all_blocks) > 0):
		element_name = set_pop(all_blocks)
		mm_type_name = reverseKeyLookup(design_model["metamodel"]["model"], dict_read_node(design_model["type_mapping"], design_model["model"][element_name]))
		element_name = instantiate_node(runtime_model, mm_type_name, element_name)
		if (is_nominal_instance(design_model, element_name, "ConstantBlock")):
			instantiate_attribute(runtime_model, element_name, "value", read_attribute(design_model, element_name, "value"))

	// Don't merge this together with the block conversion, as the destination block might not exist yet!
	all_links = allInstances(design_model, "Link")
	while (read_nr_out(all_links) > 0):
		element_name = set_pop(all_links)
		src = reverseKeyLookup(design_model["model"], read_edge_src(design_model["model"][element_name]))
		dst = reverseKeyLookup(design_model["model"], read_edge_dst(design_model["model"][element_name]))
		instantiate_link(runtime_model, "Link", element_name, src, dst)

	all_links = allInstances(design_model, "InitialCondition")
	while (read_nr_out(all_links) > 0):
		element_name = set_pop(all_links)
		src = reverseKeyLookup(design_model["model"], read_edge_src(design_model["model"][element_name]))
		dst = reverseKeyLookup(design_model["model"], read_edge_dst(design_model["model"][element_name]))
		instantiate_link(runtime_model, "InitialCondition", element_name, src, dst)

	return runtime_model!

Element function sanitize(new_runtime_model : Element, old_runtime_model : Element):
	Element all_blocks
	Element all_links
	String element_name
	String attr_name
	String attr_value
	String attribute
	String time
	Element all_attributes
	Float current_time

	all_blocks = allInstances(new_runtime_model, "Block")
	while (list_len(all_blocks) > 0):
		element_name = set_pop(all_blocks)
		if (dict_in(old_runtime_model["model"], element_name)):
			if (is_nominal_instance(new_runtime_model, element_name, "ICBlock")):
				instantiate_attribute(new_runtime_model, element_name, "last_in", read_attribute(old_runtime_model, element_name, "last_in"))
			if (is_nominal_instance(new_runtime_model, element_name, "IntegratorBlock")):
				instantiate_attribute(new_runtime_model, element_name, "last_out", read_attribute(old_runtime_model, element_name, "last_out"))
			instantiate_attribute(new_runtime_model, element_name, "signal", read_attribute(old_runtime_model, element_name, "signal"))
		else:
			instantiate_attribute(new_runtime_model, element_name, "signal", 0.0)

	if (dict_in(old_runtime_model["model"], "time")):
		current_time = read_attribute(old_runtime_model, "time", "current_time")
	else:
		current_time = 0

	time = instantiate_node(new_runtime_model, "Time", "time")
	instantiate_attribute(new_runtime_model, time, "start_time", current_time)
	instantiate_attribute(new_runtime_model, time, "current_time", current_time)

	return new_runtime_model!

Element function create_schedule(model : Element):
	// Create nice graph first
	Element nodes
	Element successors
	String element_name
	Element incoming_links
	Element all_blocks

	nodes = allInstances(model, "Block")
	successors = create_node()
	while (read_nr_out(nodes) > 0):
		element_name = set_pop(nodes)
		if (bool_not(dict_in(successors, element_name))):
			dict_add(successors, element_name, create_node())

		if (is_nominal_instance(model, element_name, "ICBlock")):
			if (element_eq(read_attribute(model, element_name, "last_in"), read_root())):
				incoming_links = allIncomingAssociationInstances(model, element_name, "InitialCondition")
			else:
				incoming_links = create_node()
			if (is_nominal_instance(model, element_name, "DerivatorBlock")):
				Element new_incoming_links
				new_incoming_links = allIncomingAssociationInstances(model, element_name, "Link")
				while (read_nr_out(new_incoming_links) > 0):
					list_append(incoming_links, set_pop(new_incoming_links))
		else:
			incoming_links = allIncomingAssociationInstances(model, element_name, "Link")

		while (read_nr_out(incoming_links) > 0):
			String source
			source = readAssociationSource(model, set_pop(incoming_links))
			if (bool_not(dict_in(successors, source))):
				dict_add(successors, source, create_node())
			set_add(successors[source], element_name)
	
	Element values
	values = create_node()
	dict_add(values, "S", create_node())
	dict_add(values, "index", 0)
	dict_add(values, "indices", create_node())
	dict_add(values, "lowlink", create_node())
	dict_add(values, "onStack", create_node())
	dict_add(values, "successors", successors)
	dict_add(values, "SCC", create_node())

	nodes = allInstances(model, "Block")
	while (read_nr_out(nodes) > 0):
		strongconnect(set_pop(nodes), values)

	log("Computed SCC!")
	log("Print list:")
	Integer i
	Integer j
	Element lst
	i = 0
	while (i < read_nr_out(values["SCC"])):
		log("[")
		lst = list_read(values["SCC"], i)
		j = 0
		while (j < read_nr_out(lst)):
			log("    " + cast_v2s(list_read(lst, j)))
			j = j + 1
		log("]")
		i = i + 1
	log("=== END")
	return values["SCC"]!

Void function dict_overwrite(d : Element, key : Element, value : Element):
	if (dict_in(d, key)):
		dict_delete(d, key)
	if (dict_in_node(d, key)):
		dict_delete_node(d, key)
	dict_add(d, key, value)

	return !

Integer function min(a : Integer, b : Integer):
	if (a < b):
		return a!
	else:
		return b!

Void function strongconnect(v : String, values : Element):
	if (dict_in(values["indices"], v)):
		return!
	log("Compute strong connected components")
	log("Source: " + v)

	dict_overwrite(values["indices"], v, values["index"])
	dict_overwrite(values["lowlink"], v, values["index"])
	dict_overwrite(values, "index", cast_s2i(cast_v2s(values["index"])) + 1)

	list_append(values["S"], v)
	dict_overwrite(values["onStack"], v, True)
	
	Element successors
	String w
	successors = values["successors"][v]
	while (read_nr_out(successors) > 0):
		w = set_pop(successors)
		log("Found successor " + w)
		if (bool_not(dict_in(values["indices"], w))):
			strongconnect(w, values)
			log("Old lowlink: " + cast_v2s(values["lowlink"][v]))
			dict_overwrite(values["lowlink"], v, min(values["lowlink"][v], values["lowlink"][w]))
			log("Set lowlink of " + v)
			log("   to " + cast_v2s(values["lowlink"][v]))
		elif (dict_in(values["onStack"], w)):
			if (values["onStack"][w]):
				dict_overwrite(values["lowlink"], v, min(values["lowlink"][v], values["indices"][w]))
	
	if (value_eq(values["lowlink"][v], values["indices"][v])):
		Element scc
		scc = create_node()
		// It will always differ now
		w = list_pop(values["S"])
		list_append(scc, w)
		while (w != v):
			w = list_pop(values["S"])
			list_append(scc, w)
			dict_overwrite(values["onStack"], w, False)
		list_insert(values["SCC"], scc, 0)

	return!

Element function list_pop(list : Element):
	Integer top
	Element t
	top = list_len(list) - 1
	t = list_read(list, top)
	list_delete(list, top)
	return t!

String function readType(model : Element, name : String):
	return reverseKeyLookup(model["metamodel"]["model"], dict_read_node(model["type_mapping"], model["model"][name]))!

Void function step_simulation(model : Element, schedule : Element):
	String time
	Float signal
	Element incoming
	String selected
	String block
	String elem
	String blocktype
	Element memory_blocks
	Integer i
	Float delta_t

	time = "time"
	delta_t = 0.1

	memory_blocks = create_node()
	output("SIM_TIME " + cast_v2s(read_attribute(model, time, "current_time")))
	i = 0
	while (i < read_nr_out(schedule)):
		block = list_read(schedule, i)
		i = i + 1

		// Execute "block"
		blocktype = readType(model, block)
		if (blocktype == "ConstantBlock"):
			signal = read_attribute(model, block, "value")
		elif (blocktype == "AdditionBlock"):
			signal = 0.0
			incoming = allIncomingAssociationInstances(model, block, "Link")
			while (read_nr_out(incoming) > 0):
				selected = readAssociationSource(model, set_pop(incoming))
				signal = signal + cast_s2f(cast_v2s(read_attribute(model, selected, "signal")))
		elif (blocktype == "MultiplyBlock"):
			signal = 1.0
			incoming = allIncomingAssociationInstances(model, block, "Link")
			while (read_nr_out(incoming) > 0):
				selected = readAssociationSource(model, set_pop(incoming))
				signal = signal * cast_s2f(cast_v2s(read_attribute(model, selected, "signal")))
		elif (blocktype == "NegatorBlock"):
			incoming = allIncomingAssociationInstances(model, block, "Link")
			signal = 0.0
			while (read_nr_out(incoming) > 0):
				selected = readAssociationSource(model, set_pop(incoming))
				signal = float_neg(cast_s2f(cast_v2s(read_attribute(model, selected, "signal"))))
		elif (blocktype == "InverseBlock"):
			signal = 0.0
			incoming = allIncomingAssociationInstances(model, block, "Link")
			while (read_nr_out(incoming) > 0):
				selected = readAssociationSource(model, set_pop(incoming))
				signal = float_division(1.0, cast_s2f(cast_v2s(read_attribute(model, selected, "signal"))))
		elif (blocktype == "DelayBlock"):
			signal = 0.0
			if (element_eq(read_attribute(model, block, "last_in"), read_root())):
				// No memory yet, so use initial condition
				incoming = allIncomingAssociationInstances(model, block, "InitialCondition")
				while (read_nr_out(incoming) > 0):
					selected = readAssociationSource(model, set_pop(incoming))
					signal = cast_s2f(cast_v2s(read_attribute(model, selected, "signal")))
			else:
				signal = read_attribute(model, block, "last_in")
				unset_attribute(model, block, "last_in")
			set_add(memory_blocks, block)
		elif (blocktype == "IntegratorBlock"):
			if (element_eq(read_attribute(model, block, "last_in"), read_root())):
				// No history yet, so use initial values
				incoming = allIncomingAssociationInstances(model, block, "InitialCondition")
				while (read_nr_out(incoming) > 0):
					selected = readAssociationSource(model, set_pop(incoming))
					signal = cast_s2f(cast_v2s(read_attribute(model, selected, "signal")))
			else:
				signal = cast_s2f(cast_v2s(read_attribute(model, block, "last_in"))) + (delta_t * cast_s2f(cast_v2s(read_attribute(model, block, "last_out"))))
				unset_attribute(model, block, "last_in")
				unset_attribute(model, block, "last_out")
			instantiate_attribute(model, block, "last_out", signal)
			set_add(memory_blocks, block)
		elif (blocktype == "DerivatorBlock"):
			if (element_eq(read_attribute(model, block, "last_in"), read_root())):
				// No history yet, so use initial values
				incoming = allIncomingAssociationInstances(model, block, "InitialCondition")
				while (read_nr_out(incoming) > 0):
					selected = readAssociationSource(model, set_pop(incoming))
					signal = cast_s2f(cast_v2s(read_attribute(model, selected, "signal")))
			else:
				incoming = allIncomingAssociationInstances(model, block, "Link")
				while (read_nr_out(incoming) > 0):
					selected = readAssociationSource(model, set_pop(incoming))
					signal = (cast_s2f(cast_v2s(read_attribute(model, selected, "signal"))) - cast_s2f(cast_v2s(read_attribute(model, block, "last_in")))) / delta_t
				unset_attribute(model, block, "last_in")
			set_add(memory_blocks, block)

		unset_attribute(model, block, "signal")
		instantiate_attribute(model, block, "signal", signal)
		output((("SIM_PROBE " + cast_v2s(block)) + " ") + cast_v2s(signal))
	output("SIM_END")
	
	while (read_nr_out(memory_blocks) > 0):
		block = set_pop(memory_blocks)
		// Update memory
		incoming = allIncomingAssociationInstances(model, block, "Link")
		while (read_nr_out(incoming) > 0):
			selected = readAssociationSource(model, set_pop(incoming))
			instantiate_attribute(model, block, "last_in", cast_s2f(cast_v2s(read_attribute(model, selected, "signal"))))

	// Increase simulation time
	Float new_time
	new_time = cast_s2f(cast_v2s(read_attribute(model, time, "current_time"))) + delta_t
	unset_attribute(model, time, "current_time")
	instantiate_attribute(model, time, "current_time", new_time)

	return !

Void function execute_cbd(design_model : Element):
	String verify_result
	Element runtime_model
	Element old_runtime_model
	String cmd
	Boolean running
	Element schedule_init
	Element schedule_run
	Element schedule
	String conforming

	old_runtime_model = instantiate_model(import_node("models/CausalBlockDiagrams_Runtime"))
	runtime_model = retype_to_runtime(design_model)
	runtime_model = sanitize(runtime_model, old_runtime_model)
	running = False
	conforming = conformance_scd(design_model)
	if (conforming == "OK"):
		output("CONFORMANCE_OK")
	else:
		output("CONFORMANCE_FAIL")

	schedule_init = create_schedule(runtime_model)
	schedule_run = read_root()

	while (True):
		// If we are running, we just don't block for input and automatically do a step if there is no input
		if (running):
			if (has_input()):
				cmd = input()
			else:
				cmd = "step"
		else:
			cmd = input()

		// Process input
		if (cmd == "simulate"):
			// Simulation should toggle running to True, but only if the model is conforming
			if (conforming == "OK"):
				running = True
			else:
				output("CONFORMANCE_FAIL " + conforming)

		elif (cmd == "step"):
			// Stepping should make a single step, but first need to pick the correct schedule to use
			if (conforming == "OK"):
				if (read_attribute(runtime_model, "time", "start_time") == read_attribute(runtime_model, "time", "current_time")):
					schedule = schedule_init
				else:
					if (element_eq(schedule_run, read_root())):
						schedule_run = create_schedule(runtime_model)
					schedule = schedule_run
				step_simulation(runtime_model, schedule)
			else:
				output("CONFORMANCE_FAIL " + conforming)

		elif (cmd == "pause"):
			// Pausing merely stops a running simulation
			running = False

		elif (cmd == "read_available_attributes"):
			// Returns a list of all available attributes
			Element attr_list
			Element attrs
			Element attr
			attr_list = getAttributeList(design_model, input())
			attrs = dict_keys(attr_list)
			while (0 < read_nr_out(attrs)):
				attr = set_pop(attrs)
				output("AVAILABLE_ATTR_VALUE " + cast_v2s(attr))
				output("AVAILABLE_ATTR_TYPE " + cast_v2s(dict_read(attr_list, attr)))
			output("AVAILABLE_ATTR_END")

		elif (cmd == "read_attribute"):
			// Returns the value of an attribute
			output("ATTR_VALUE " + cast_v2s(read_attribute(design_model, input(), input())))

		elif (bool_or(bool_or(cmd == "set_attribute", cmd == "instantiate_node"), bool_or(cmd == "delete_element", cmd == "instantiate_association"))):
			// Modify the structure
			if (cmd == "set_attribute"):
				// Setting an attribute
				String element_name
				String attribute_name
				element_name = input()
				attribute_name = input()

				// Delete it if it exists already
				if (bool_not(element_eq(read_attribute(design_model, element_name, attribute_name), read_root()))):
					unset_attribute(design_model, element_name, attribute_name)

				// And finally set it
				instantiate_attribute(design_model, element_name, attribute_name, input())

			elif (cmd == "instantiate_node"):
				// Instantiate a node
				instantiate_node(design_model, input(), input())

			elif (cmd == "instantiate_association"):
				// Instantiate an association
				instantiate_link(design_model, input(), input(), input(), input())

			elif (cmd == "delete_element"):
				// Delete the provided element
				model_delete_element(design_model, input())

			// After changes, we check whether or not the design model conforms
			conforming = conformance_scd(design_model)
			if (conforming == "OK"):
				// Conforming, so do the retyping and sanitization step
				runtime_model = retype_to_runtime(design_model)
				runtime_model = sanitize(runtime_model, old_runtime_model)
				log("Create schedule")
				schedule_init = create_schedule(runtime_model)
				log("Remove schedule")
				schedule_run = read_root()
				old_runtime_model = runtime_model
				output("CONFORMANCE_OK")
			else:
				// Not conforming, so stop simulation and block for input (preferably a modify to make everything consistent again)
				running = False
				output("CONFORMANCE_FAIL " + conforming)
		else:
			log("Did not understand command: " + cmd)