"""Unit tests for history export parsing (exporting.history).

The commit-message grammar is defined by message_builder (Section 15);
these tests pin the parser against it.
"""

from __future__ import annotations

from git_auto_tracker.exporting.history import (
    HistoryRecord,
    parse_message,
    to_rows,
)

_MESSAGE = """SCADA automatic change capture - 2026-09-12 08:00:03+02:00

Summary:
  Added: 1
  Modified: 1
  Deleted: 1
  Renamed: 0

Changes:
  A ; Stations/PS101/pump2.xml ; DOMAIN\\jsmith ; 2026-09-12 07:41:22+02:00
  M ; System/global.xml ; UNKNOWN ; 2026-09-12 07:45:01+02:00
  D ; Stations/PS027/old-config.xml

Tracker-Version: 1.0.0
Tracker-Run: 01M2ADPMSHSA2TZKVH6PSVDVA0
Tracker-Host: SCADA-SRV-01
Tracker-Changes: 3
"""


class TestParseMessage:
    def test_full_message(self) -> None:
        record = parse_message(_MESSAGE, ";")
        assert record is not None
        assert record.collected_at == "2026-09-12 08:00:03+02:00"
        assert record.run_id == "01M2ADPMSHSA2TZKVH6PSVDVA0"
        assert record.host == "SCADA-SRV-01"
        assert len(record.rows) == 3

        added = record.rows[0]
        assert added["letter"] == "A"
        assert added["path"] == "Stations/PS101/pump2.xml"
        assert added["author"] == "DOMAIN\\jsmith"
        assert added["mtime"] == "2026-09-12 07:41:22+02:00"

        modified = record.rows[1]
        assert modified["letter"] == "M"
        assert modified["author"] == "UNKNOWN"

        deleted = record.rows[2]
        assert deleted["letter"] == "D"
        assert deleted["path"] == "Stations/PS027/old-config.xml"
        assert deleted["author"] == ""  # bare line (FR-013)

    def test_paths_with_semicolon_inside_are_not_broken(self) -> None:
        # A path containing ';' is ambiguous by design; the parser splits on
        # ' ; ' so a lone ';' inside a filename keeps the line intact here.
        message = _MESSAGE.replace(
            "Stations/PS101/pump2.xml", " Stations/PS101;backup.xml".strip()
        )
        record = parse_message(message, ";")
        assert record is not None
        assert record.rows[0]["path"] == "Stations/PS101;backup.xml"

    def test_non_tracker_message_returns_none(self) -> None:
        assert parse_message("initial import\n", ";") is None
        assert parse_message("", ";") is None

    def test_custom_separator(self) -> None:
        message = _MESSAGE.replace(" ; ", " | ")
        record = parse_message(message, "|")
        assert record is not None
        assert len(record.rows) == 3
        assert record.rows[0]["path"] == "Stations/PS101/pump2.xml"

    def test_wrong_separator_yields_no_rows_but_is_tracker_commit(self) -> None:
        # Written with ';', parsed with '|': recognized but not splittable.
        record = parse_message(_MESSAGE, "|")
        assert record is not None
        assert record.collected_at  # tracker commit detected
        assert record.rows == []    # but no reliable rows

    def test_rename_line(self) -> None:
        message = _MESSAGE.replace(
            "  D ; Stations/PS027/old-config.xml",
            "  R ; Stations/PS027/old.xml -> Stations/PS027/new.xml",
        )
        record = parse_message(message, ";")
        assert record is not None
        row = record.rows[2]
        assert row["letter"] == "R"
        assert row["previous_path"] == "Stations/PS027/old.xml"
        assert row["path"] == "Stations/PS027/new.xml"


class TestToRows:
    def test_long_format(self) -> None:
        record = parse_message(_MESSAGE, ";")
        assert record is not None
        record.commit = "a1b2c3d"
        rows = to_rows([record])
        assert len(rows) == 3
        first = rows[0]
        assert first["commit"] == "a1b2c3d"
        assert first["run_id"] == "01M2ADPMSHSA2TZKVH6PSVDVA0"
        assert first["letter"] == "A"
        assert set(first) == {
            "commit", "collected_at", "run_id", "host",
            "letter", "path", "previous_path", "author", "mtime",
        }

    def test_empty(self) -> None:
        assert to_rows([]) == []
        assert to_rows([HistoryRecord(commit="x")]) == []