class TimeSeriesReport(ReportView):
    report_title = _("Time Series Report")
    report_description = _(
        "Groups clients as rows and generates one column per month across the date range. The time_series_columns list defines what is computed for each period.")
    report_model = SalesTransaction
    group_by = "client"
    date_field = "date"

    # options are : "daily", "weekly", "bi-weekly", "monthly", "quarterly", "semiannually", "annually" and "custom"
    time_series_pattern = "monthly"

    # These columns will be calculated for each period in the time series.
    time_series_columns = [
        ComputationField.create(Sum, "value", verbose_name=_("Sales For ")),
    ]

    columns = [
        "name",
        # placeholder for the generated time series columns
        "__time_series__",
        # This is the same as the time_series_columns, but this one will be on the whole set
        ComputationField.create(Sum, "value", verbose_name=_("Total Sales")),
    ]

    chart_settings = [
        Chart(
            "Client Sales",
            Chart.BAR,
            data_source=["sum__value"],
            title_source=["name"],
        ),
        Chart(
            "Total Sales [Pie]",
            Chart.PIE,
            data_source=["sum__value"],
            title_source=["name"],
            plot_total=True,
        ),
        Chart(
            "Total Sales [Area chart]",
            Chart.AREA,
            data_source=["sum__value"],
            title_source=["name"],
        ),
    ]