// Method that will create the different nodes in the graphs and will organize them using the production rules
public void GenerateMission(int minTaskNumber, int maxTaskNumber, int minOrganizeTaskTries, int maxOrganizeTaskTries, float probabiltyApplyOrganizationRule)
{
// Randomly choose the number task nodes
int numberTaskNodes = Random.Range(minTaskNumber, maxTaskNumber);
// Set the number of total nodes in the graph based on the number of task nodes plus the entance and goal nodes
totalNodes = numberTaskNodes + 2;
// Randomly choose the number of times the algorithm will try to apply the reorganize tasks production rules
int numberOrganizeTaskTries = Random.Range(minOrganizeTaskTries, maxOrganizeTaskTries);
// The graph always start with the start mission production rule
ProductionRules.StartMission((StartNode)rootNode, this);
// The first node to the right of the root of the graph is going to be always a task node
TaskNode currentTaskNode = (TaskNode)rootNode.getConnection(Direction.Right);
// The node to the right of the first task node is going to be always the goal node
GoalNode goalNode = (GoalNode)currentTaskNode.getConnection(Direction.Right);
// The first step to create the mission is to add all the tasks one by one
for (int i = 0; i < numberTaskNodes; i++)
{
ProductionRules.AddTask(currentTaskNode, goalNode);
currentTaskNode = (TaskNode)goalNode.getConnection(Direction.Left);
}
// The next and final step is to reorganize the tasks position starting from the right of the root node, at this stage the root is always going to be an entrance node and no rules can be applied to it
AlphabetNode currentNode = rootNode.getConnection(Direction.Right);
while (numberOrganizeTaskTries > 0)
{
// Decide whether to try apply rule from current node or go to the next one
if (currentNode is TaskNode && !currentNode.isTerminal() && Random.Range(0.0f, 1.0f) < probabiltyApplyOrganizationRule)
{
// Get number of nodes from the current that are also non terminal task nodes towards the right
AlphabetNode nextRightNode = currentNode.getConnection(Direction.Right);
List <AlphabetNode> connections = new List <AlphabetNode>();
// The biggest number of task nodes taken by a production rule is six
for (int i = 0; i < 6; i++)
{
if (nextRightNode != null && nextRightNode is TaskNode && !nextRightNode.isTerminal())
{
connections.Add(nextRightNode);
nextRightNode = nextRightNode.getConnection(Direction.Right);
}
}
// Apply production rules based on the number of right task connections from current node, when multiple rules can be applied, all of them have the same probability of being picked
switch (connections.Count)
{
case 2:
// Only one rule can be applied
ProductionRules.ReorganizeThreeTasks((TaskNode)currentNode, (TaskNode)connections[0], (TaskNode)connections[1]);
break;
case 3:
// Two rules can be applied
if (Random.Range(0.0f, 1.0f) > 0.5f)
{
ProductionRules.ReorganizeThreeTasks((TaskNode)currentNode, (TaskNode)connections[0], (TaskNode)connections[1]);
}
else
{
ProductionRules.ReorganizeFourTasks((TaskNode)currentNode, (TaskNode)connections[0], (TaskNode)connections[1], (TaskNode)connections[2]);
}
break;
case 4:
// Three rules can be applied
float random = Random.Range(0.0f, 1.0f);
if (random < (1.0f / 3.0f))
{
ProductionRules.ReorganizeThreeTasks((TaskNode)currentNode, (TaskNode)connections[0], (TaskNode)connections[1]);
}
else if (random > (2.0f / 3.0f))
{
ProductionRules.ReorganizeFourTasks((TaskNode)currentNode, (TaskNode)connections[0], (TaskNode)connections[1], (TaskNode)connections[2]);
}
else
{
ProductionRules.ReorganizeFiveTasks((TaskNode)currentNode, (TaskNode)connections[0], (TaskNode)connections[1], (TaskNode)connections[2], (TaskNode)connections[3]);
}
break;
case 5:
// Four rules can be applied
random = Random.Range(0.0f, 1.0f);
if (random < 0.25f)
{
ProductionRules.ReorganizeThreeTasks((TaskNode)currentNode, (TaskNode)connections[0], (TaskNode)connections[1]);
}
else if (random > 0.25f && random < 0.5f)
{
ProductionRules.ReorganizeFourTasks((TaskNode)currentNode, (TaskNode)connections[0], (TaskNode)connections[1], (TaskNode)connections[2]);
}
else if (random > 0.75f)
{
ProductionRules.ReorganizeFiveTasks((TaskNode)currentNode, (TaskNode)connections[0], (TaskNode)connections[1], (TaskNode)connections[2], (TaskNode)connections[3]);
}
else
{
ProductionRules.ReorganizeSixTasks((TaskNode)currentNode, (TaskNode)connections[0], (TaskNode)connections[1], (TaskNode)connections[2], (TaskNode)connections[3], (TaskNode)connections[4]);
}
break;
}
}
// Get next node, try right first and down second
AlphabetNode previousCurrent = currentNode;
currentNode = currentNode.getConnection(Direction.Right);
if (currentNode == null)
{
currentNode = previousCurrent.getConnection(Direction.Down);
}
// If the goal node is reached, try to apply the productions rules from the beginnig
if (currentNode is GoalNode || currentNode == null)
{
currentNode = rootNode;
}
// Decrease tries
numberOrganizeTaskTries--;
}
}