# -*- coding: utf-8 -*-
"""Unit tests for material_trace_service.

Tests cover forward/reverse query logic, CONTAINERID resolution,
workcenter group enrichment/filtering, truncation, CSV export,
safeguards (memory guard, batched queries), and wildcard support.
"""

import pytest
from unittest.mock import patch, MagicMock, call

import pandas as pd

from mes_dashboard.services.material_trace_service import (
    _add_exact_or_pattern_condition,
    _enrich_workcenter_group,
    _is_pattern_token,
    _resolve_container_ids,
    _resolve_workcenter_names,
    _check_memory_guard,
    _IN_BATCH_SIZE,
    export_csv,
    forward_query,
    reverse_query,
)
from mes_dashboard.sql import QueryBuilder


# ============================================================
# Fixtures
# ============================================================

MOCK_WORKCENTER_MAPPING = {
    "WC_DB_1": {"group": "焊接_DB", "sequence": 1},
    "WC_DB_2": {"group": "焊接_DB", "sequence": 1},
    "WC_WB_1": {"group": "焊線_WB", "sequence": 2},
    "WC_MOLD_1": {"group": "封膠_Mold", "sequence": 3},
}


def _make_material_df(n=3, workcenter="WC_DB_1"):
    """Create a sample material consumption DataFrame."""
    return pd.DataFrame(
        {
            "CONTAINERID": [f"CID{i:016d}" for i in range(n)],
            "CONTAINERNAME": [f"LOT-{i:04d}" for i in range(n)],
            "PJ_WORKORDER": [f"WO-{i}" for i in range(n)],
            "WORKCENTERNAME": [workcenter] * n,
            "MATERIALPARTNAME": [f"MAT-{i}" for i in range(n)],
            "MATERIALLOTNAME": [f"MLOT-{i}" for i in range(n)],
            "VENDORLOTNUMBER": [f"VL-{i}" for i in range(n)],
            "QTYREQUIRED": [10.0] * n,
            "QTYCONSUMED": [9.5] * n,
            "EQUIPMENTNAME": [f"EQ-{i}" for i in range(n)],
            "TXNDATE": ["2025-06-01"] * n,
            "PRIMARY_CATEGORY": ["CAT_A"] * n,
            "SECONDARY_CATEGORY": ["SUB_1"] * n,
        }
    )


def _make_resolve_df(lot_names):
    """Create a DataFrame simulating DW_MES_CONTAINER resolve result."""
    rows = []
    for name in lot_names:
        rows.append({"CONTAINERID": f"CID_{name}", "CONTAINERNAME": name})
    return pd.DataFrame(rows)


# ============================================================
# 7.1 Forward LOT mode — resolve + enrichment
# ============================================================


class TestForwardLotQuery:
    @patch("mes_dashboard.services.material_trace_service.read_sql_df_slow")
    @patch("mes_dashboard.services.material_trace_service.read_sql_df")
    @patch("mes_dashboard.services.material_trace_service.get_workcenter_mapping")
    def test_forward_lot_resolves_and_enriches(self, mock_mapping, mock_sql, mock_sql_slow):
        mock_mapping.return_value = MOCK_WORKCENTER_MAPPING
        mock_sql.return_value = _make_resolve_df(["LOT-A", "LOT-B"])
        mock_sql_slow.return_value = _make_material_df(5)

        result = forward_query("lot", ["LOT-A", "LOT-B"], page=1, per_page=50)

        assert result["pagination"]["total"] == 5
        assert len(result["rows"]) == 5
        assert result["rows"][0]["WORKCENTER_GROUP"] == "焊接_DB"
        assert result["meta"] == {}
        assert mock_sql.call_count == 1
        assert mock_sql_slow.call_count == 1

    @patch("mes_dashboard.services.material_trace_service.read_sql_df_slow")
    @patch("mes_dashboard.services.material_trace_service.read_sql_df")
    @patch("mes_dashboard.services.material_trace_service.get_workcenter_mapping")
    def test_forward_lot_all_unresolved_returns_empty(self, mock_mapping, mock_sql, mock_sql_slow):
        mock_mapping.return_value = MOCK_WORKCENTER_MAPPING
        mock_sql.return_value = pd.DataFrame()

        result = forward_query("lot", ["UNKNOWN-LOT"], page=1, per_page=50)

        assert result["rows"] == []
        assert result["pagination"]["total"] == 0
        assert result["meta"]["unresolved"] == ["UNKNOWN-LOT"]
        mock_sql_slow.assert_not_called()


# ============================================================
# 7.2 Forward work order mode
# ============================================================


class TestForwardWorkorderQuery:
    @patch("mes_dashboard.services.material_trace_service.read_sql_df_slow")
    @patch("mes_dashboard.services.material_trace_service.get_workcenter_mapping")
    def test_forward_workorder_queries_directly(self, mock_mapping, mock_sql_slow):
        mock_mapping.return_value = MOCK_WORKCENTER_MAPPING
        mock_sql_slow.return_value = _make_material_df(3)

        result = forward_query("workorder", ["WO-2025-001"], page=1, per_page=50)

        assert result["pagination"]["total"] == 3
        assert len(result["rows"]) == 3
        assert mock_sql_slow.call_count == 1


# ============================================================
# 7.3 Reverse query — truncation logic
# ============================================================


class TestReverseQuery:
    @patch("mes_dashboard.services.material_trace_service.read_sql_df_slow")
    @patch("mes_dashboard.services.material_trace_service.get_workcenter_mapping")
    def test_reverse_truncation_at_10000(self, mock_mapping, mock_sql_slow):
        mock_mapping.return_value = MOCK_WORKCENTER_MAPPING
        mock_sql_slow.return_value = _make_material_df(10001)

        result = reverse_query(["MLOT-A"], page=1, per_page=50)

        assert result["meta"]["truncated"] is True
        assert result["meta"]["max_rows"] == 10000
        assert result["pagination"]["total"] == 10000

    @patch("mes_dashboard.services.material_trace_service.read_sql_df_slow")
    @patch("mes_dashboard.services.material_trace_service.get_workcenter_mapping")
    def test_reverse_no_truncation_under_limit(self, mock_mapping, mock_sql_slow):
        mock_mapping.return_value = MOCK_WORKCENTER_MAPPING
        mock_sql_slow.return_value = _make_material_df(500)

        result = reverse_query(["MLOT-A"], page=1, per_page=50)

        assert "truncated" not in result["meta"]
        assert result["pagination"]["total"] == 500


# ============================================================
# 7.4 Workcenter group filtering
# ============================================================


class TestWorkcenterGroupFilter:
    @patch("mes_dashboard.services.material_trace_service.read_sql_df_slow")
    @patch("mes_dashboard.services.material_trace_service.get_workcenters_for_groups")
    @patch("mes_dashboard.services.material_trace_service.get_workcenter_mapping")
    def test_workcenter_group_resolves_to_names(self, mock_mapping, mock_for_groups, mock_sql_slow):
        mock_mapping.return_value = MOCK_WORKCENTER_MAPPING
        mock_for_groups.return_value = ["WC_DB_1", "WC_DB_2"]
        mock_sql_slow.return_value = _make_material_df(3)

        result = forward_query(
            "workorder", ["WO-001"], workcenter_groups=["焊接_DB"], page=1, per_page=50
        )

        mock_for_groups.assert_called_once_with(["焊接_DB"])
        sql_call = mock_sql_slow.call_args
        sql_text = sql_call[0][0]
        assert "WORKCENTERNAME IN" in sql_text
        assert result["pagination"]["total"] == 3


# ============================================================
# 7.5 Unresolved LOT IDs
# ============================================================


class TestUnresolvedLots:
    @patch("mes_dashboard.services.material_trace_service.read_sql_df_slow")
    @patch("mes_dashboard.services.material_trace_service.read_sql_df")
    @patch("mes_dashboard.services.material_trace_service.get_workcenter_mapping")
    def test_partial_resolve_reports_unresolved(self, mock_mapping, mock_sql, mock_sql_slow):
        mock_mapping.return_value = MOCK_WORKCENTER_MAPPING
        resolve_df = pd.DataFrame(
            [{"CONTAINERID": "CID_LOT_A", "CONTAINERNAME": "LOT-A"}]
        )
        mock_sql.return_value = resolve_df
        mock_sql_slow.return_value = _make_material_df(2)

        result = forward_query("lot", ["LOT-A", "LOT-B"], page=1, per_page=50)

        assert result["meta"]["unresolved"] == ["LOT-B"]
        assert result["pagination"]["total"] == 2


# ============================================================
# Enrichment helper
# ============================================================


class TestEnrichWorkcenterGroup:
    def test_enrich_maps_correctly(self):
        df = pd.DataFrame({"WORKCENTERNAME": ["WC_DB_1", "WC_WB_1", "UNKNOWN"]})
        with patch(
            "mes_dashboard.services.material_trace_service.get_workcenter_mapping"
        ) as mock:
            mock.return_value = MOCK_WORKCENTER_MAPPING
            result = _enrich_workcenter_group(df)

        assert list(result["WORKCENTER_GROUP"]) == ["焊接_DB", "焊線_WB", ""]


# ============================================================
# CSV export
# ============================================================


class TestExportCsv:
    @patch("mes_dashboard.services.material_trace_service.read_sql_df_slow")
    @patch("mes_dashboard.services.material_trace_service.get_workcenter_mapping")
    def test_export_returns_utf8_bom_csv(self, mock_mapping, mock_sql_slow):
        mock_mapping.return_value = MOCK_WORKCENTER_MAPPING
        mock_sql_slow.return_value = _make_material_df(3)

        csv_bytes, meta = export_csv("workorder", ["WO-001"])

        assert csv_bytes[:3] == b"\xef\xbb\xbf"
        csv_text = csv_bytes.decode("utf-8-sig")
        assert "LOT ID" in csv_text
        assert "料號" in csv_text
        lines = csv_text.strip().split("\n")
        assert len(lines) == 4


# ============================================================
# Safeguards: memory guard
# ============================================================


class TestMemoryGuard:
    def test_memory_guard_raises_on_large_df(self):
        with patch("mes_dashboard.services.material_trace_service._MAX_RESULT_MB", 0):
            df = _make_material_df(10)
            with pytest.raises(MemoryError, match="超過.*上限"):
                _check_memory_guard(df)

    def test_memory_guard_passes_small_df(self):
        df = _make_material_df(5)
        _check_memory_guard(df)


# ============================================================
# Safeguards: IN-clause batching
# ============================================================


class TestInClauseBatching:
    @patch("mes_dashboard.services.material_trace_service.read_sql_df_slow")
    @patch("mes_dashboard.services.material_trace_service.get_workcenter_mapping")
    def test_large_input_is_batched(self, mock_mapping, mock_sql_slow):
        mock_mapping.return_value = MOCK_WORKCENTER_MAPPING
        mock_sql_slow.return_value = _make_material_df(3)

        values = [f"WO-{i}" for i in range(1500)]
        result = forward_query("workorder", values, page=1, per_page=50)

        assert mock_sql_slow.call_count == 2
        assert result["pagination"]["total"] > 0


# ============================================================
# Wildcard support
# ============================================================


class TestWildcardHelpers:
    def test_is_pattern_token_with_star(self):
        assert _is_pattern_token("GA250605*") is True

    def test_is_pattern_token_with_percent(self):
        assert _is_pattern_token("GA250605%") is True

    def test_is_pattern_token_exact(self):
        assert _is_pattern_token("GA25060001-A01") is False

    def test_add_exact_or_pattern_mixed(self):
        """Mixed exact + wildcard values produce IN + LIKE conditions."""
        builder = QueryBuilder(base_sql="SELECT 1 FROM t {{ WHERE_CLAUSE }}")
        _add_exact_or_pattern_condition(builder, "col", ["EXACT-1", "WILD*"])
        sql, params = builder.build()
        assert "IN" in sql
        assert "LIKE" in sql
        # Wildcard normalized: * → %
        like_params = [v for v in params.values() if "%" in str(v)]
        assert len(like_params) == 1
        assert like_params[0] == "WILD%"


class TestWildcardResolve:
    @patch("mes_dashboard.services.material_trace_service.read_sql_df")
    def test_wildcard_resolve_generates_like(self, mock_sql):
        """Wildcard LOT names produce LIKE clause in resolve SQL."""
        mock_sql.return_value = _make_resolve_df(["LOT-A001"])

        _resolve_container_ids(["LOT-A*"])

        sql_text = mock_sql.call_args[0][0]
        assert "LIKE" in sql_text

    @patch("mes_dashboard.services.material_trace_service.read_sql_df")
    def test_wildcard_not_reported_as_unresolved(self, mock_sql):
        """Wildcard tokens that match 0 rows should NOT appear in unresolved."""
        mock_sql.return_value = pd.DataFrame()

        _, _, unresolved = _resolve_container_ids(["WILD*"])

        # Wildcard tokens are not counted as unresolved
        assert unresolved == []

    @patch("mes_dashboard.services.material_trace_service.read_sql_df")
    def test_exact_unresolved_still_reported(self, mock_sql):
        """Exact tokens that don't resolve ARE reported as unresolved."""
        mock_sql.return_value = pd.DataFrame()

        _, _, unresolved = _resolve_container_ids(["EXACT-MISSING"])

        assert unresolved == ["EXACT-MISSING"]


class TestWildcardWorkorder:
    @patch("mes_dashboard.services.material_trace_service.read_sql_df_slow")
    @patch("mes_dashboard.services.material_trace_service.get_workcenter_mapping")
    def test_workorder_wildcard_generates_like(self, mock_mapping, mock_sql_slow):
        """Wildcard work orders produce LIKE clause in query SQL."""
        mock_mapping.return_value = MOCK_WORKCENTER_MAPPING
        mock_sql_slow.return_value = _make_material_df(3)

        forward_query("workorder", ["WO-2025*"], page=1, per_page=50)

        sql_text = mock_sql_slow.call_args[0][0]
        assert "LIKE" in sql_text