"""Metrologist blueprint - SPC statistics dashboard and API proxies."""
from flask import Blueprint, jsonify, render_template, request
from flask_babel import gettext as _

from blueprints.auth import login_required, role_required
from services.api_client import api_client

statistics_bp = Blueprint("statistics", __name__)


# ============================================================================
# PAGINE
# ============================================================================

@statistics_bp.route("/dashboard")
@login_required
@role_required("Metrologist")
def dashboard():
    """SPC dashboard overview — loads recipes for filter dropdown."""
    resp = api_client.get("/api/recipes", params={"per_page": 100})
    if isinstance(resp, dict) and resp.get("error"):
        recipes = []
    else:
        recipes = resp.get("items", []) if isinstance(resp, dict) else []

    return render_template("statistics/dashboard.html", recipes=recipes)


# ============================================================================
# PROXY API AJAX → FastAPI
# ============================================================================

def _proxy_statistics(endpoint: str):
    """Forward query params to a FastAPI statistics endpoint."""
    params = {}
    for key in [
        "recipe_id", "version_id", "subtask_id",
        "date_from", "date_to", "operator_id",
        "lot_number", "serial_number", "n_bins",
    ]:
        val = request.args.get(key)
        if val is not None and val != "":
            params[key] = val

    resp = api_client.get(f"/api/statistics/{endpoint}", params=params)

    if isinstance(resp, dict) and resp.get("error"):
        return jsonify({"error": True, "detail": resp.get("detail", "")}), resp.get("status_code", 500)

    return jsonify(resp)


@statistics_bp.route("/api/summary")
@login_required
@role_required("Metrologist")
def api_summary():
    """Proxy: summary pass/fail/warning."""
    return _proxy_statistics("summary")


@statistics_bp.route("/api/capability")
@login_required
@role_required("Metrologist")
def api_capability():
    """Proxy: capability indices."""
    return _proxy_statistics("capability")


@statistics_bp.route("/api/control-chart")
@login_required
@role_required("Metrologist")
def api_control_chart():
    """Proxy: control chart data."""
    return _proxy_statistics("control-chart")


@statistics_bp.route("/api/histogram")
@login_required
@role_required("Metrologist")
def api_histogram():
    """Proxy: histogram data."""
    return _proxy_statistics("histogram")


@statistics_bp.route("/api/subtasks")
@login_required
@role_required("Metrologist")
def api_subtasks():
    """Proxy: get subtasks for recipe filter."""
    params = {}
    recipe_id = request.args.get("recipe_id")
    if recipe_id:
        params["recipe_id"] = recipe_id
    version_id = request.args.get("version_id")
    if version_id:
        params["version_id"] = version_id

    resp = api_client.get("/api/statistics/subtasks", params=params)

    if isinstance(resp, dict) and resp.get("error"):
        return jsonify({"error": True, "detail": resp.get("detail", "")}), resp.get("status_code", 500)

    # Response is a list
    if isinstance(resp, list):
        return jsonify(resp)

    return jsonify(resp)