"""数据字典模块测试。"""
import sys
from unittest.mock import patch, AsyncMock, MagicMock

from httpx import AsyncClient

from tests.conftest import auth_header
from app.services.db_connector import QueryResult


def _mock_query_result(columns, rows):
    """Helper: build a QueryResult for mocking execute_query."""
    return QueryResult(
        columns=columns,
        rows=rows,
        total=len(rows),
        elapsed_ms=10,
        truncated=False,
    )


class TestListDatabases:
    async def test_list_databases_success(
        self, client: AsyncClient, test_instance, admin_token
    ):
        mock_result = _mock_query_result(
            ["Database"],
            [
                {"Database": "test_db"},
                {"Database": "app_db"},
                {"Database": "information_schema"},
            ],
        )
        with patch(
            "app.services.dictionary_service.DBConnector.execute_query",
            new_callable=AsyncMock,
            return_value=mock_result,
        ):
            resp = await client.get(
                "/api/v1/dictionary/instances/" + str(test_instance.id) + "/databases",
                headers=auth_header(admin_token),
            )
            assert resp.status_code == 200
            data = resp.json()
            assert "databases" in data
            db_list = data["databases"]
            assert "test_db" in db_list
            assert "app_db" in db_list
            # system databases should be filtered
            assert "information_schema" not in db_list

    async def test_list_databases_not_found(
        self, client: AsyncClient, admin_token
    ):
        resp = await client.get(
            "/api/v1/dictionary/instances/99999/databases",
            headers=auth_header(admin_token),
        )
        assert resp.status_code == 404


class TestListTables:
    async def test_list_tables_success(
        self, client: AsyncClient, test_instance, admin_token
    ):
        mock_result = _mock_query_result(
            ["TABLE_NAME"],
            [{"TABLE_NAME": "users"}, {"TABLE_NAME": "orders"}],
        )
        with patch(
            "app.services.dictionary_service.DBConnector.execute_query",
            new_callable=AsyncMock,
            return_value=mock_result,
        ):
            resp = await client.get(
                "/api/v1/dictionary/instances/" + str(test_instance.id) + "/tables",
                params={"database": "test_db"},
                headers=auth_header(admin_token),
            )
            assert resp.status_code == 200
            data = resp.json()
            assert "tables" in data
            assert "users" in data["tables"]
            assert "orders" in data["tables"]


class TestGetTableDetail:
    async def test_table_detail_success(
        self, client: AsyncClient, test_instance, admin_token
    ):
        col_result = _mock_query_result(
            ["Field", "Type", "Null", "Key", "Default", "Extra", "Comment"],
            [
                {
                    "Field": "id",
                    "Type": "int",
                    "Null": "NO",
                    "Key": "PRI",
                    "Default": None,
                    "Extra": "auto_increment",
                    "Comment": "primary key",
                },
            ],
        )
        idx_result = _mock_query_result(
            ["Key_name", "Non_unique", "Index_type", "Column_name"],
            [
                {"Key_name": "PRIMARY", "Non_unique": 0, "Index_type": "BTREE", "Column_name": "id"},
            ],
        )
        ddl_result = _mock_query_result(
            ["Table", "Create Table"],
            [{"Table": "users", "Create Table": "CREATE TABLE users (id int PRIMARY KEY)"}],
        )
        cnt_result = _mock_query_result(
            ["TABLE_ROWS"],
            [{"TABLE_ROWS": 42}],
        )

        call_count = 0
        results = [col_result, idx_result, ddl_result, cnt_result]

        async def _mock_execute(*args, **kwargs):
            nonlocal call_count
            r = results[call_count]
            call_count += 1
            return r

        with patch(
            "app.services.dictionary_service.DBConnector.execute_query",
            new=AsyncMock(side_effect=_mock_execute),
        ):
            resp = await client.get(
                "/api/v1/dictionary/instances/" + str(test_instance.id) + "/tables/users",
                params={"database": "test_db"},
                headers=auth_header(admin_token),
            )
            assert resp.status_code == 200
            data = resp.json()
            assert "columns" in data
            assert len(data["columns"]) == 1
            assert data["columns"][0]["Field"] == "id"
            assert "indexes" in data
            assert "create_ddl" in data
            assert "row_count" in data
            assert data["row_count"] == 42


class TestExportDictionary:
    async def test_export_success(
        self, client: AsyncClient, test_instance, admin_token
    ):
        # list_tables returns 1 table
        tbl_result = _mock_query_result(
            ["TABLE_NAME"],
            [{"TABLE_NAME": "users"}],
        )
        # get_table_detail: columns
        col_result = _mock_query_result(
            ["Field", "Type", "Null", "Key", "Default", "Extra", "Comment"],
            [{"Field": "id", "Type": "int", "Null": "NO", "Key": "PRI", "Default": None, "Extra": "", "Comment": ""}],
        )
        # indexes
        idx_result = _mock_query_result(
            ["Key_name", "Non_unique", "Index_type", "Column_name"],
            [{"Key_name": "PRIMARY", "Non_unique": 0, "Index_type": "BTREE", "Column_name": "id"}],
        )
        # ddl
        ddl_result = _mock_query_result(
            ["Table", "Create Table"],
            [{"Table": "users", "Create Table": "CREATE TABLE users (id int)"}],
        )
        # row count
        cnt_result = _mock_query_result(
            ["TABLE_ROWS"],
            [{"TABLE_ROWS": 10}],
        )

        results = [tbl_result, col_result, idx_result, ddl_result, cnt_result]
        call_count = 0

        async def _mock_execute(*args, **kwargs):
            nonlocal call_count
            r = results[call_count]
            call_count += 1
            return r

        with patch(
            "app.services.dictionary_service.DBConnector.execute_query",
            new=AsyncMock(side_effect=_mock_execute),
        ):
            resp = await client.get(
                "/api/v1/dictionary/instances/" + str(test_instance.id) + "/export",
                params={"database": "test_db"},
                headers=auth_header(admin_token),
            )
            assert resp.status_code == 200
            data = resp.json()
            assert "tables" in data
            assert len(data["tables"]) == 1
            assert data["tables"][0]["table_name"] == "users"


class TestPermission:
    async def test_guest_forbidden(
        self, client: AsyncClient, test_instance, guest_token
    ):
        resp = await client.get(
            "/api/v1/dictionary/instances/" + str(test_instance.id) + "/databases",
            headers=auth_header(guest_token),
        )
        assert resp.status_code == 403

    async def test_developer_allowed(
        self, client: AsyncClient, test_instance, developer_token
    ):
        mock_result = _mock_query_result(["Database"], [])
        with patch(
            "app.services.dictionary_service.DBConnector.execute_query",
            new_callable=AsyncMock,
            return_value=mock_result,
        ):
            resp = await client.get(
                "/api/v1/dictionary/instances/" + str(test_instance.id) + "/databases",
                headers=auth_header(developer_token),
            )
            assert resp.status_code == 200