"""Metrologist blueprint - SPC statistics and dashboards."""
from flask import Blueprint, render_template, session, redirect, url_for

statistics_bp = Blueprint("statistics", __name__)


@statistics_bp.route("/dashboard")
def dashboard():
    """SPC dashboard overview."""
    if "user" not in session:
        return redirect(url_for("auth.login"))
    return render_template("statistics/dashboard.html")


@statistics_bp.route("/control-chart")
def control_chart():
    """X-bar / R control chart."""
    if "user" not in session:
        return redirect(url_for("auth.login"))
    return render_template("statistics/control_chart.html")


@statistics_bp.route("/histogram")
def histogram():
    """Histogram with normal curve."""
    if "user" not in session:
        return redirect(url_for("auth.login"))
    return render_template("statistics/histogram.html")


@statistics_bp.route("/capability")
def capability():
    """Cp/Cpk/Pp/Ppk capability gauge."""
    if "user" not in session:
        return redirect(url_for("auth.login"))
    return render_template("statistics/capability.html")


@statistics_bp.route("/trend")
def trend():
    """Temporal trends and period comparison."""
    if "user" not in session:
        return redirect(url_for("auth.login"))
    return render_template("statistics/trend.html")