"""CLI migration tests using real command-owned SQLite sessions.

Migration services and package I/O remain fakes so these cases can focus on
CLI parsing and session lifecycle without fabricating the SQLAlchemy boundary.
"""

import json
from pathlib import Path

from click.testing import CliRunner
from sqlalchemy.engine import Engine
from sqlalchemy.orm import Session

from commands import data_migration
from commands.data_migration import (
    ID_STRATEGY_CHOICES,
    export_migration_data,
    export_migration_data_template,
    import_migration_data,
)
from services.data_migration.entities import (
    ConflictStrategy,
    ExportResult,
    ImportOptions,
    ImportResult,
    MigrationPackage,
    ReportContext,
)


def test_export_command_requires_input_and_output():
    result = CliRunner().invoke(export_migration_data, [])

    assert result.exit_code != 0
    assert export_migration_data.name == "export-app-migration"
    assert "--input" in result.output
    assert "--output" in result.output


def test_import_command_requires_input_and_target_tenant_or_package_metadata():
    result = CliRunner().invoke(import_migration_data, [])

    assert result.exit_code != 0
    assert import_migration_data.name == "import-app-migration"
    assert "--input" in result.output


def test_import_command_does_not_expose_unimplemented_map_id_strategy():
    assert ID_STRATEGY_CHOICES == ["preserve-id", "generate-new-id"]


def test_export_template_command_prints_scripted_json_template():
    result = CliRunner().invoke(export_migration_data_template, [])

    assert result.exit_code == 0
    assert export_migration_data_template.name == "app-migration-template"
    template = json.loads(result.output)
    assert template == {
        "source_tenant": {"mode": "single", "id": "", "name": "admin's Workspace"},
        "apps": {"modes": ["workflow", "advanced-chat"], "ids": [], "all": True},
        "include_referenced_tools": True,
        "additional_tools": {"api_tools": [], "workflow_tools": [], "mcp_tools": []},
        "include_secrets": False,
        "import_options": {
            "create_app_api_token_on_import": False,
            "id_strategy": "preserve-id",
            "conflict_strategy": "fail",
        },
    }


def test_export_template_command_writes_output_file(tmp_path):
    output_file = tmp_path / "export-template.json"

    result = CliRunner().invoke(export_migration_data_template, ["--output", str(output_file)])

    assert result.exit_code == 0
    assert f"Output written to {output_file}" in result.output
    assert json.loads(output_file.read_text())["apps"]["all"] is True


def test_export_template_command_requires_overwrite_for_existing_output(tmp_path):
    output_file = tmp_path / "export-template.json"
    output_file.write_text("{}")

    result = CliRunner().invoke(export_migration_data_template, ["--output", str(output_file)])

    assert result.exit_code != 0
    assert "already exists" in result.output


def test_export_command_uses_cli_owned_session(monkeypatch, tmp_path: Path, sqlite_engine: Engine):
    captured: dict[str, object] = {}
    input_file = tmp_path / "export-config.json"
    output_file = tmp_path / "migration-package.json"
    input_file.write_text(json.dumps({"source_tenant": {"name": "source"}, "apps": {"all": True}}))
    package = MigrationPackage.from_mapping({"metadata": {"version": "1", "source_scope": "single"}})

    class FakeMigrationExportService:
        def export(self, selection, *, session):
            captured["session"] = session
            captured["selection"] = selection
            return ExportResult(package=package, report_items=[], report_context=ReportContext())

    class FakeMigrationPackageService:
        def save_package(self, package_to_save, path, *, overwrite):
            captured["package"] = package_to_save
            captured["path"] = path
            captured["overwrite"] = overwrite

    monkeypatch.setattr(data_migration.session_factory, "create_session", lambda: Session(sqlite_engine))
    monkeypatch.setattr(data_migration, "MigrationExportService", FakeMigrationExportService)
    monkeypatch.setattr(data_migration, "MigrationPackageService", FakeMigrationPackageService)

    result = CliRunner().invoke(
        export_migration_data,
        ["--input", str(input_file), "--output", str(output_file)],
    )

    assert result.exit_code == 0
    captured_session = captured["session"]
    assert isinstance(captured_session, Session)
    assert captured_session.get_bind() is sqlite_engine
    assert captured_session.in_transaction() is False
    assert captured["package"] is package
    assert captured["path"] == str(output_file)
    assert captured["overwrite"] is False


def test_import_command_uses_cli_owned_session(monkeypatch, tmp_path: Path, sqlite_engine: Engine):
    captured: dict[str, object] = {}
    input_file = tmp_path / "migration-package.json"
    input_file.write_text("{}")
    package = MigrationPackage.from_mapping(
        {
            "metadata": {
                "version": "1",
                "source_scope": "single",
                "target_tenant": {"name": "target"},
                "import_options": {"conflict_strategy": "fail"},
            }
        }
    )

    class FakeMigrationImportService:
        def import_package(self, request, *, session):
            captured["session"] = session
            captured["request"] = request
            return ImportResult(report_items=[], report_context=ReportContext(target_tenant="target"))

    class FakeMigrationPackageService:
        def load_package(self, path):
            captured["path"] = path
            return package

    monkeypatch.setattr(data_migration.session_factory, "create_session", lambda: Session(sqlite_engine))
    monkeypatch.setattr(data_migration, "MigrationImportService", FakeMigrationImportService)
    monkeypatch.setattr(data_migration, "MigrationPackageService", FakeMigrationPackageService)

    result = CliRunner().invoke(
        import_migration_data,
        ["--input", str(input_file), "--conflict-strategy", "skip"],
    )

    assert result.exit_code == 0
    captured_session = captured["session"]
    assert isinstance(captured_session, Session)
    assert captured_session.get_bind() is sqlite_engine
    assert captured_session.in_transaction() is False
    assert captured["path"] == str(input_file)
    request = captured["request"]
    assert request.package is package
    assert request.options_override == ImportOptions(conflict_strategy=ConflictStrategy.SKIP)