import { Task, TaskCategory, TaskCategoryID } from "../models/task";
import { Project } from "../models/project";
import { TaskCategoriesTableProps } from "../routes/project/task-categories-table";

export function getTaskWeightedMean(t: Task): number {
  return (t.estimations.optimistic + (4*t.estimations.likely) + t.estimations.pessimistic) / 6;
}

export function getTaskStandardDeviation(t: Task): number {
  return (t.estimations.pessimistic - t.estimations.optimistic) / 6;
}

export function getProjectWeightedMean(p : Project): number {
  return Object.values(p.tasks).reduce((sum: number, t: Task) => {
    sum += getTaskWeightedMean(t);
    return sum;
  }, 0);
}

export function getTaskCategoryWeightedMean(taskCategoryId: TaskCategoryID, p : Project): number {
  return Object.values(p.tasks).filter(t => t.category === taskCategoryId).reduce((sum: number, t: Task) => {
    sum += getTaskWeightedMean(t);
    return sum;
  }, 0);
}

export function getProjectStandardDeviation(p : Project): number {
  return Math.sqrt(Object.values(p.tasks).reduce((sum: number, t: Task) => {
    sum += Math.pow(getTaskStandardDeviation(t), 2);
    return sum;
  }, 0));
}