"""Istoricul pachetelor si exportul CSV."""
from __future__ import annotations

import csv
import io

from flask import Blueprint, Response, render_template, request

from ..repositories import get_recipe, list_packages, list_recipes, to_csv_rows
from ..units import format_weight

bp = Blueprint("history", __name__, url_prefix="/istoric")


def _filters() -> dict:
    recipe_id = request.args.get("recipe_id", "").strip()
    status = request.args.get("status", "").strip()
    return {
        "date_from": request.args.get("date_from", "").strip(),
        "date_to": request.args.get("date_to", "").strip(),
        "recipe_id": int(recipe_id) if recipe_id.isdigit() else None,
        "status": status if status in {"open", "done", "void"} else "",
        "query": request.args.get("q", "").strip(),
        "limit": 1000,
    }


def _totals(packages: list[dict]) -> str:
    groups: dict[str, float] = {}
    for package in packages:
        if package.get("status") != "done":
            continue
        unit = package.get("unit") or ""
        groups[unit] = groups.get(unit, 0.0) + float(package.get("total_weight") or 0)
    return ", ".join(
        f"{format_weight(value)} {unit}" for unit, value in sorted(groups.items())
    ) or "0"


@bp.get("")
def index():
    filters = _filters()
    packages = list_packages(**filters)
    recipe = get_recipe(filters["recipe_id"]) if filters["recipe_id"] else None
    return render_template(
        "history/list.html",
        packages=packages,
        filters=filters,
        recipes=list_recipes(include_inactive=True),
        total=_totals(packages),
        selected_recipe=recipe,
    )


@bp.get("/export.csv")
def export_csv():
    packages = list_packages(**_filters())
    buffer = io.StringIO()
    writer = csv.writer(buffer, delimiter=";", lineterminator="\r\n")
    writer.writerows(to_csv_rows(packages))
    return Response(
        buffer.getvalue(),
        mimetype="text/csv; charset=utf-8",
        headers={"Content-Disposition": 'attachment; filename="produse-finite.csv"'},
    )