from __future__ import annotations

import os
import tempfile
import unittest
from pathlib import Path
from unittest.mock import patch

from arr_ingestion.contracts import IngestionError
from arr_ingestion.postgres import (
    DatabaseConfig,
    PostgresIngestionRepository,
)
from tests.test_arr_opera_daily_ingest import run_processor, success_xml


class InsertCursor:
    def __init__(self) -> None:
        self.params: list[tuple[object, ...]] = []
        self._next_id = 100

    def execute(self, query: str, params: tuple[object, ...]) -> None:
        self.assert_placeholder_count(query, params)
        self.params.append(params)

    @staticmethod
    def assert_placeholder_count(query: str, params: tuple[object, ...]) -> None:
        if query.count("%s") != len(params):
            raise AssertionError(
                f"placeholder mismatch: {query.count('%s')} != {len(params)}"
            )

    def fetchone(self) -> tuple[int]:
        current = self._next_id
        self._next_id += 1
        return (current,)


class BookingCursor:
    def __init__(self) -> None:
        self.executed: tuple[str, tuple[object, ...]] | None = None

    def execute(self, query: str, params: tuple[object, ...]) -> None:
        InsertCursor.assert_placeholder_count(query, params)
        self.executed = (query, params)

    def fetchall(self):
        return [
            ("GROUP-MATCH", 1),
            ("GROUP-REPEATED", 2),
        ]


class SqlStateError(RuntimeError):
    def __init__(self, sqlstate: str):
        super().__init__("synthetic database error")
        self.sqlstate = sqlstate


class RetryConnection:
    def __init__(self) -> None:
        self.closed = False

    def transaction(self):
        return self

    def cursor(self):
        return self

    def __enter__(self):
        return self

    def __exit__(self, _kind, _value, _traceback):
        return False

    def close(self) -> None:
        self.closed = True


class PostgresIngestionTests(unittest.TestCase):
    def test_database_config_is_environment_only(self):
        with patch.dict(os.environ, {}, clear=True):
            with self.assertRaisesRegex(IngestionError, "ARR_DATABASE_URL"):
                DatabaseConfig.from_environment()
        with patch.dict(os.environ, {"ARR_DATABASE_URL": "postgresql://synthetic"}, clear=True):
            self.assertEqual(
                DatabaseConfig.from_environment().dsn,
                "postgresql://synthetic",
            )

    def test_record_insert_maps_duplicate_lineage_and_booking_source_status(self):
        with tempfile.TemporaryDirectory() as temp_dir:
            exit_code, _xml, _output, _result, payload = run_processor(
                success_xml(), Path(temp_dir)
            )
            self.assertEqual(exit_code, 0)
            cursor = InsertCursor()
            links = {
                "AB-123": ("matched", 1),
                "GO-EASY-GROUP": ("matched", 2),
            }
            PostgresIngestionRepository._insert_records(
                cursor,
                9,
                payload["records"],
                links,
            )

            self.assertEqual(len(cursor.params), payload["source_rows"])
            for params in cursor.params:
                self.assertEqual(params[0], 9)
                self.assertEqual(len(params), 33)
            duplicate_params = cursor.params[2]
            self.assertEqual(duplicate_params[7], 101)
            matched_params = cursor.params[1]
            self.assertEqual(matched_params[-2:], ("matched", 1))
            missing_group_params = cursor.params[3]
            self.assertEqual(
                missing_group_params[-2:], ("missing_group_code", 0)
            )
            repeated_params = cursor.params[4]
            self.assertEqual(repeated_params[-2:], ("matched", 2))

    def test_booking_lookup_accepts_repeated_group_rows_and_marks_unmatched(self):
        records = [
            {"group_code_key": "GROUP-MATCH"},
            {"group_code_key": "GROUP-REPEATED"},
            {"group_code_key": "GROUP-MISSING"},
            {"group_code_key": None},
        ]
        cursor = BookingCursor()
        links = PostgresIngestionRepository._load_booking_links(cursor, records)
        self.assertEqual(links["GROUP-MATCH"], ("matched", 1))
        self.assertEqual(links["GROUP-REPEATED"], ("matched", 2))
        self.assertEqual(links["GROUP-MISSING"], ("unmatched", 0))
        self.assertIsNotNone(cursor.executed)

    def test_transaction_reopens_after_serialization_failure(self):
        connections = [RetryConnection(), RetryConnection()]
        connect_count = 0
        operation_count = 0

        def connect(_dsn: str):
            nonlocal connect_count
            connection = connections[connect_count]
            connect_count += 1
            return connection

        def operation(_cursor):
            nonlocal operation_count
            operation_count += 1
            if operation_count == 1:
                raise SqlStateError("40001")
            return "committed"

        repository = PostgresIngestionRepository(
            DatabaseConfig("postgresql://synthetic"), connect=connect
        )
        with patch.object(repository, "_begin"), patch("arr_ingestion.postgres.time.sleep"):
            result = repository._run_transaction(operation, "safe failure")

        self.assertEqual(result, "committed")
        self.assertEqual(connect_count, 2)
        self.assertEqual(operation_count, 2)
        self.assertTrue(all(connection.closed for connection in connections))

    def test_nontransient_database_failure_is_not_retried(self):
        connection = RetryConnection()
        repository = PostgresIngestionRepository(
            DatabaseConfig("postgresql://synthetic"), connect=lambda _dsn: connection
        )

        with patch.object(repository, "_begin"):
            with self.assertRaisesRegex(IngestionError, "safe failure") as raised:
                repository._run_transaction(
                    lambda _cursor: (_ for _ in ()).throw(SqlStateError("22000")),
                    "safe failure",
                )

        self.assertEqual(raised.exception.code, "DATABASE_WRITE_FAILED")
        self.assertTrue(connection.closed)


class Migration008ContractTests(unittest.TestCase):
    def test_rebuild_targets_v3_and_all_source_record_storage(self):
        project_root = Path(__file__).resolve().parents[1]
        sql = (project_root / "database" / "008_arr_mvp_v1_rebuild.sql").read_text(
            encoding="utf-8"
        )
        for required in (
            "CREATE TABLE ingestion.processing_runs",
            "CREATE TABLE ingestion.processing_attempts",
            "CREATE TABLE ingestion.processing_deliveries",
            "CREATE TABLE ingestion.outbox_events",
            "structured_result_artifact_id",
            "CREATE TABLE booking.source_rows",
            "CREATE TABLE booking.parse_versions",
            "CREATE TABLE finance.daily_records",
            "CREATE VIEW finance.v_monthly_report_rows",
            "CREATE VIEW finance.v_channel_details",
            "outcome <> 'retained'",
            "total_price = real_price * no_of_rooms * nights",
        ):
            with self.subTest(required=required):
                self.assertIn(required, sql)
        self.assertNotIn("CREATE TABLE finance.report_versions", sql)
        self.assertNotIn("CREATE TABLE booking.file_objects", sql)


if __name__ == "__main__":
    unittest.main(verbosity=2)