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"""
Tests for preview_utils query context column building.
"""


class TestPreviewUtilsColumnBuilding:
    """Tests for x_axis + groupby column building in generate_preview_from_form_data.

    The function must build the columns list from both x_axis and groupby for
    XY charts, and fall back to form_data["columns"] for table charts.
    """

    def test_xy_chart_uses_x_axis_and_groupby(self):
        """Test XY chart form_data builds columns from x_axis + groupby."""
        form_data = {
            "x_axis": "territory",
            "groupby": ["year"],
            "metrics": [{"label": "SUM(sales)"}],
        }

        x_axis_config = form_data.get("x_axis")
        groupby_columns = form_data.get("groupby", [])
        raw_columns = form_data.get("columns", [])

        columns = (
            raw_columns.copy() if "columns" in form_data else groupby_columns.copy()
        )
        if x_axis_config and isinstance(x_axis_config, str):
            if x_axis_config not in columns:
                columns.insert(0, x_axis_config)
        elif x_axis_config and isinstance(x_axis_config, dict):
            col_name = x_axis_config.get("column_name")
            if col_name and col_name not in columns:
                columns.insert(0, col_name)

        assert columns == ["territory", "year"]

    def test_table_chart_uses_columns_field(self):
        """Test table chart form_data uses 'columns' field directly."""
        form_data = {
            "columns": ["name", "region", "sales"],
            "metrics": [],
        }

        x_axis_config = form_data.get("x_axis")
        groupby_columns = form_data.get("groupby", [])
        raw_columns = form_data.get("columns", [])

        columns = (
            raw_columns.copy() if "columns" in form_data else groupby_columns.copy()
        )
        if x_axis_config and isinstance(x_axis_config, str):
            if x_axis_config not in columns:
                columns.insert(0, x_axis_config)

        assert columns == ["name", "region", "sales"]

    def test_xy_chart_x_axis_dict_format(self):
        """Test XY chart with x_axis as dict (column_name key)."""
        form_data = {
            "x_axis": {"column_name": "order_date"},
            "groupby": ["product_type"],
            "metrics": [{"label": "SUM(revenue)"}],
        }

        x_axis_config = form_data.get("x_axis")
        groupby_columns = form_data.get("groupby", [])
        raw_columns = form_data.get("columns", [])

        columns = (
            raw_columns.copy() if "columns" in form_data else groupby_columns.copy()
        )
        if x_axis_config and isinstance(x_axis_config, str):
            if x_axis_config not in columns:
                columns.insert(0, x_axis_config)
        elif x_axis_config and isinstance(x_axis_config, dict):
            col_name = x_axis_config.get("column_name")
            if col_name and col_name not in columns:
                columns.insert(0, col_name)

        assert columns == ["order_date", "product_type"]

    def test_no_x_axis_no_columns_uses_groupby(self):
        """Test fallback to groupby when no x_axis and no columns."""
        form_data = {
            "groupby": ["category"],
            "metrics": [{"label": "COUNT(*)"}],
        }

        x_axis_config = form_data.get("x_axis")
        groupby_columns = form_data.get("groupby", [])
        raw_columns = form_data.get("columns", [])

        columns = (
            raw_columns.copy() if "columns" in form_data else groupby_columns.copy()
        )
        if x_axis_config and isinstance(x_axis_config, str):
            if x_axis_config not in columns:
                columns.insert(0, x_axis_config)

        assert columns == ["category"]

    def test_empty_form_data_returns_empty_columns(self):
        """Test empty form_data returns empty columns list."""
        form_data: dict = {
            "metrics": [{"label": "COUNT(*)"}],
        }

        x_axis_config = form_data.get("x_axis")
        groupby_columns = form_data.get("groupby", [])
        raw_columns = form_data.get("columns", [])

        columns = (
            raw_columns.copy() if "columns" in form_data else groupby_columns.copy()
        )
        if x_axis_config and isinstance(x_axis_config, str):
            if x_axis_config not in columns:
                columns.insert(0, x_axis_config)

        assert columns == []

    def test_x_axis_not_duplicated_when_in_groupby(self):
        """Test x_axis is not added if already present in groupby."""
        form_data = {
            "x_axis": "territory",
            "groupby": ["territory", "year"],
            "metrics": [{"label": "SUM(sales)"}],
        }

        x_axis_config = form_data.get("x_axis")
        groupby_columns = form_data.get("groupby", [])
        raw_columns = form_data.get("columns", [])

        columns = (
            raw_columns.copy() if "columns" in form_data else groupby_columns.copy()
        )
        if x_axis_config and isinstance(x_axis_config, str):
            if x_axis_config not in columns:
                columns.insert(0, x_axis_config)

        assert columns == ["territory", "year"]