"""Integration-level tool tests using in-memory DataFrames (no .yxmd required)."""
from __future__ import annotations
import sys
from pathlib import Path
import xml.etree.ElementTree as ET
import pytest
import polars as pl

PKG = Path(__file__).parent.parent  # alteryx_runner/
if str(PKG) not in sys.path:
    sys.path.insert(0, str(PKG))

from engine.graph import NodeDef
from engine.context import RunContext


def make_node(tool_id: int, plugin: str, config_xml: str) -> NodeDef:
    config = ET.fromstring(config_xml)
    return NodeDef(tool_id=tool_id, plugin=plugin, config=config)


@pytest.fixture
def ctx(tmp_path):
    return RunContext(workflow_dir=str(tmp_path), verbose=False)


# ---------------------------------------------------------------------------
# TextInput
# ---------------------------------------------------------------------------

class TestTextInput:
    def test_basic(self, ctx):
        from tools.inout.text_input import TextInputTool
        xml = """<Configuration>
          <Fields><Field name="A"/><Field name="B"/></Fields>
          <Data>
            <r><c>1</c><c>hello</c></r>
            <r><c>2</c><c></c></r>
          </Data>
        </Configuration>"""
        node = make_node(1, "", xml)
        result = TextInputTool(node, ctx).execute({})
        df = result["Output"]
        assert df.shape == (2, 2)
        assert df["A"].to_list() == ["1", "2"]
        assert df["B"][1] is None   # empty → NULL


# ---------------------------------------------------------------------------
# Filter
# ---------------------------------------------------------------------------

class TestFilter:
    def _df(self) -> pl.DataFrame:
        return pl.DataFrame({"ID": [1, 2, 3, 4], "Region": ["North", "South", "North", "South"]})

    def test_simple_gt(self, ctx):
        from tools.preparation.filter_tool import FilterTool
        xml = """<Configuration>
          <Mode>Simple</Mode>
          <Simple>
            <Operator>&gt;</Operator>
            <Field>ID</Field>
            <Operands><Operand>2</Operand><DateType>fixed</DateType></Operands>
          </Simple>
          <Expression>[ID] &gt; 2</Expression>
        </Configuration>"""
        node = make_node(1, "", xml)
        result = FilterTool(node, ctx).execute({"Input": self._df()})
        assert len(result["True"]) == 2
        assert len(result["False"]) == 2

    def test_custom_expr(self, ctx):
        from tools.preparation.filter_tool import FilterTool
        xml = """<Configuration>
          <Mode>Custom</Mode>
          <Expression>[Region] == "South"</Expression>
        </Configuration>"""
        node = make_node(1, "", xml)
        result = FilterTool(node, ctx).execute({"Input": self._df()})
        assert len(result["True"]) == 2
        assert all(v == "South" for v in result["True"]["Region"].to_list())


# ---------------------------------------------------------------------------
# Select
# ---------------------------------------------------------------------------

class TestSelect:
    def test_drop_and_rename(self, ctx):
        from tools.preparation.select_tool import SelectTool
        df = pl.DataFrame({"A": [1, 2], "B": [3, 4], "C": [5, 6]})
        xml = """<Configuration OrderChanged="False">
          <SelectFields>
            <SelectField field="A" selected="True" rename="Alpha"/>
            <SelectField field="B" selected="False"/>
            <SelectField field="*Unknown" selected="True"/>
          </SelectFields>
        </Configuration>"""
        node = make_node(1, "", xml)
        result = SelectTool(node, ctx).execute({"Input": df})["Output"]
        assert "Alpha" in result.columns
        assert "B" not in result.columns
        assert "C" in result.columns  # *Unknown passes through


# ---------------------------------------------------------------------------
# Sort
# ---------------------------------------------------------------------------

class TestSort:
    def test_ascending(self, ctx):
        from tools.preparation.sort_tool import SortTool
        df = pl.DataFrame({"Name": ["Charlie", "Alice", "Bob"], "Score": [3, 1, 2]})
        xml = """<Configuration>
          <SortInfo locale="0">
            <Field field="Name" order="Ascending"/>
          </SortInfo>
        </Configuration>"""
        node = make_node(1, "", xml)
        result = SortTool(node, ctx).execute({"Input": df})["Output"]
        assert result["Name"].to_list() == ["Alice", "Bob", "Charlie"]

    def test_descending(self, ctx):
        from tools.preparation.sort_tool import SortTool
        df = pl.DataFrame({"Score": [3, 1, 2]})
        xml = """<Configuration>
          <SortInfo locale="0">
            <Field field="Score" order="Descending"/>
          </SortInfo>
        </Configuration>"""
        node = make_node(1, "", xml)
        result = SortTool(node, ctx).execute({"Input": df})["Output"]
        assert result["Score"].to_list() == [3, 2, 1]


# ---------------------------------------------------------------------------
# Unique
# ---------------------------------------------------------------------------

class TestUnique:
    def test_unique_and_duplicate(self, ctx):
        from tools.preparation.unique_tool import UniqueTool
        df = pl.DataFrame({"Name": ["Alice", "Bob", "Alice", "Charlie", "Bob"]})
        xml = """<Configuration>
          <UniqueFields><Field name="Name"/></UniqueFields>
        </Configuration>"""
        node = make_node(1, "", xml)
        result = UniqueTool(node, ctx).execute({"Input": df})
        assert len(result["Unique"]) == 3
        assert len(result["Duplicate"]) == 2


# ---------------------------------------------------------------------------
# Sample
# ---------------------------------------------------------------------------

class TestSample:
    def _df(self) -> pl.DataFrame:
        return pl.DataFrame({"N": list(range(10))})

    def test_first(self, ctx):
        from tools.preparation.sample_tool import SampleTool
        xml = "<Configuration><Mode>First</Mode><N>3</N><GroupFields/></Configuration>"
        node = make_node(1, "", xml)
        result = SampleTool(node, ctx).execute({"Input": self._df()})["Output"]
        assert len(result) == 3
        assert result["N"].to_list() == [0, 1, 2]

    def test_last(self, ctx):
        from tools.preparation.sample_tool import SampleTool
        xml = "<Configuration><Mode>Last</Mode><N>2</N><GroupFields/></Configuration>"
        node = make_node(1, "", xml)
        result = SampleTool(node, ctx).execute({"Input": self._df()})["Output"]
        assert result["N"].to_list() == [8, 9]


# ---------------------------------------------------------------------------
# Union
# ---------------------------------------------------------------------------

class TestUnion:
    def test_by_name(self, ctx):
        from tools.join.union_tool import UnionTool
        df1 = pl.DataFrame({"A": [1], "B": [2]})
        df2 = pl.DataFrame({"B": [4], "A": [3]})
        xml = "<Configuration><Mode>Auto</Mode></Configuration>"
        node = make_node(1, "", xml)
        result = UnionTool(node, ctx).execute({"Input1": df1, "Input2": df2})["Output"]
        assert len(result) == 2

    def test_by_position(self, ctx):
        from tools.join.union_tool import UnionTool
        df1 = pl.DataFrame({"X": [1], "Y": [2]})
        df2 = pl.DataFrame({"P": [3], "Q": [4]})
        xml = "<Configuration><Mode>ByPosition</Mode></Configuration>"
        node = make_node(1, "", xml)
        result = UnionTool(node, ctx).execute({"Input1": df1, "Input2": df2})["Output"]
        assert result.columns == ["X", "Y"]
        assert len(result) == 2


# ---------------------------------------------------------------------------
# Summarize
# ---------------------------------------------------------------------------

class TestSummarize:
    def test_group_sum(self, ctx):
        from tools.transform.summarize_tool import SummarizeTool
        df = pl.DataFrame({
            "Region": ["N", "S", "N", "S"],
            "Sales": [100, 200, 150, 250],
        })
        xml = """<Configuration>
          <SummarizeFields>
            <SummarizeField field="Region" action="GroupBy" rename="Region"/>
            <SummarizeField field="Sales" action="Sum" rename="Total"/>
          </SummarizeFields>
        </Configuration>"""
        node = make_node(1, "", xml)
        result = SummarizeTool(node, ctx).execute({"Input": df})["Output"]
        assert set(result.columns) == {"Region", "Total"}
        totals = dict(zip(result["Region"].to_list(), result["Total"].to_list()))
        assert totals["N"] == 250
        assert totals["S"] == 450


# ---------------------------------------------------------------------------
# Transpose
# ---------------------------------------------------------------------------

class TestTranspose:
    def test_unpivot(self, ctx):
        from tools.transform.transpose_tool import TransposeTool
        df = pl.DataFrame({"ID": [1, 2], "Visits": [5, 10], "Spend": [100, 200]})
        xml = """<Configuration>
          <KeyFields><Field name="ID"/></KeyFields>
          <DataFields>
            <Field name="Visits"/>
            <Field name="Spend"/>
          </DataFields>
        </Configuration>"""
        node = make_node(1, "", xml)
        result = TransposeTool(node, ctx).execute({"Input": df})["Output"]
        assert "Name" in result.columns
        assert "Value" in result.columns
        assert len(result) == 4  # 2 rows × 2 data cols


# ---------------------------------------------------------------------------
# RecordID
# ---------------------------------------------------------------------------

class TestRecordID:
    def test_starts_at_one(self, ctx):
        from tools.preparation.record_id import RecordIDTool
        df = pl.DataFrame({"Name": ["A", "B", "C"]})
        xml = """<Configuration>
          <Field>ID</Field>
          <StartValue>1</StartValue>
          <FieldType>Int32</FieldType>
        </Configuration>"""
        node = make_node(1, "", xml)
        result = RecordIDTool(node, ctx).execute({"Input": df})["Output"]
        assert result["ID"].to_list() == [1, 2, 3]
        assert result.columns[0] == "ID"