from unittest.mock import MagicMock

from sync.config import FileMapping
from sync.compare import compare_file, any_mismatch, format_report, TableResult


def _fm(**kw):
    base = dict(file="x.accdb", root="2026", schema="s", year_suffix="_YEAR2026")
    base.update(kw)
    return FileMapping(**base)


def _reader_with_tables(tables):
    r = MagicMock()
    r.list_user_tables.return_value = tables
    return r


def test_count_match():
    fm = _fm(exclude_tables=["TableChangeLog"])
    reader = _reader_with_tables(["T1", "TableChangeLog"])
    reader.count_rows.return_value = 5
    writer = MagicMock()
    writer.table_exists.return_value = True
    writer.count_target.return_value = 5
    res = compare_file(fm, reader, writer, "count")
    assert len(res) == 1
    assert res[0].access_table == "T1"
    assert res[0].status == "match"
    assert res[0].access_count == 5 and res[0].sql_count == 5


def test_count_mismatch():
    fm = _fm()
    reader = _reader_with_tables(["T1"])
    reader.count_rows.return_value = 5
    writer = MagicMock()
    writer.table_exists.return_value = True
    writer.count_target.return_value = 7
    res = compare_file(fm, reader, writer, "count")
    assert res[0].status == "mismatch"


def test_skip_when_mirror_missing():
    fm = _fm()
    reader = _reader_with_tables(["T1"])
    writer = MagicMock()
    writer.table_exists.return_value = False
    res = compare_file(fm, reader, writer, "count")
    assert res[0].status == "skipped"
    writer.count_target.assert_not_called()
    writer.read_target_ids.assert_not_called()


def test_ids_match():
    fm = _fm()
    reader = _reader_with_tables(["T1"])
    reader.read_ids.return_value = [1, 2, 3]
    writer = MagicMock()
    writer.table_exists.return_value = True
    writer.read_target_ids.return_value = [1, 2, 3]
    res = compare_file(fm, reader, writer, "ids")
    assert res[0].status == "match"
    assert res[0].missing_in_sql == []
    assert res[0].extra_in_sql == []


def test_ids_reports_missing_and_extra():
    fm = _fm()
    reader = _reader_with_tables(["T1"])
    reader.read_ids.return_value = [1, 2, 3]
    writer = MagicMock()
    writer.table_exists.return_value = True
    writer.read_target_ids.return_value = [2, 3, 4]
    res = compare_file(fm, reader, writer, "ids")
    assert res[0].status == "mismatch"
    assert res[0].missing_in_sql == [1]   # in Access, not in SQL
    assert res[0].extra_in_sql == [4]     # in SQL, not in Access


def test_excluded_tables_not_compared():
    fm = _fm(exclude_tables=["TableChangeLog"])
    reader = _reader_with_tables(["T1", "TableChangeLog"])
    reader.count_rows.return_value = 1
    writer = MagicMock()
    writer.table_exists.return_value = True
    writer.count_target.return_value = 1
    res = compare_file(fm, reader, writer, "count")
    assert [r.access_table for r in res] == ["T1"]


def test_any_mismatch_detects_mismatch_only():
    r_match = TableResult("f", "T", "s", "T_YEAR2026", "match", 1, 1)
    r_skip = TableResult("f", "T2", "s", "T2_YEAR2026", "skipped")
    r_mis = TableResult("f", "T3", "s", "T3_YEAR2026", "mismatch", 1, 2)
    assert any_mismatch([r_match, r_skip]) is False
    assert any_mismatch([r_match, r_mis]) is True


def test_format_report_count():
    r = TableResult("x.accdb", "T1", "s", "T1_YEAR2026", "mismatch", 5, 7)
    rep = format_report([r], "count")
    assert "x.accdb: T1 -> s.T1_YEAR2026" in rep
    assert "access=5 sql=7" in rep
    assert "[MISMATCH]" in rep