import { Project } from "../models/project";
import { useState, useEffect } from "preact/hooks";
import { getProjectWeightedMean, getProjectStandardDeviation } from "../util/stat";

export interface Estimation {
    e: number
    sd: number
}

export interface ProjetEstimations {
    p99: Estimation
    p90: Estimation
    p68: Estimation
}

export function useProjectEstimations(p :Project): ProjetEstimations {
    const [ estimations, setEstimations ] = useState({
        p99: { e: 0, sd: 0 },
        p90: { e: 0, sd: 0 },
        p68: { e: 0, sd: 0 },
    });

    useEffect(() => {
        const projectWeightedMean = getProjectWeightedMean(p)
        const projectStandardDeviation = getProjectStandardDeviation(p);

        setEstimations({
            p99: { e: projectWeightedMean, sd: (projectStandardDeviation * 3) },
            p90: { e: projectWeightedMean, sd: (projectStandardDeviation * 1.645) },
            p68: { e: projectWeightedMean, sd: (projectStandardDeviation) },
        })
    }, [p.tasks]);

    return estimations;
}