"""Tests for core/db.py — schema and migration (KIN-071)."""

import sqlite3
import pytest
from core.db import init_db, _migrate


@pytest.fixture
def conn():
    c = init_db(db_path=":memory:")
    yield c
    c.close()


def _cols(conn, table: str) -> set[str]:
    """Return set of column names for a table."""
    return {row["name"] for row in conn.execute(f"PRAGMA table_info({table})").fetchall()}


# ---------------------------------------------------------------------------
# Schema: новые колонки KIN-071 присутствуют при свежей инициализации
# ---------------------------------------------------------------------------

class TestProjectsSchemaKin071:
    """PRAGMA table_info(projects) должен содержать новые KIN-071 колонки."""

    def test_schema_has_project_type_column(self, conn):
        assert "project_type" in _cols(conn, "projects")

    def test_schema_has_ssh_host_column(self, conn):
        assert "ssh_host" in _cols(conn, "projects")

    def test_schema_has_ssh_user_column(self, conn):
        assert "ssh_user" in _cols(conn, "projects")

    def test_schema_has_ssh_key_path_column(self, conn):
        assert "ssh_key_path" in _cols(conn, "projects")

    def test_schema_has_ssh_proxy_jump_column(self, conn):
        assert "ssh_proxy_jump" in _cols(conn, "projects")

    def test_schema_has_description_column(self, conn):
        assert "description" in _cols(conn, "projects")

    def test_project_type_defaults_to_development(self, conn):
        """INSERT без project_type → значение по умолчанию 'development'."""
        conn.execute(
            "INSERT INTO projects (id, name, path) VALUES ('t1', 'T', '/t')"
        )
        conn.commit()
        row = conn.execute(
            "SELECT project_type FROM projects WHERE id='t1'"
        ).fetchone()
        assert row["project_type"] == "development"

    def test_ssh_fields_default_to_null(self, conn):
        """SSH-поля по умолчанию NULL."""
        conn.execute(
            "INSERT INTO projects (id, name, path) VALUES ('t2', 'T', '/t')"
        )
        conn.commit()
        row = conn.execute(
            "SELECT ssh_host, ssh_user, ssh_key_path, ssh_proxy_jump FROM projects WHERE id='t2'"
        ).fetchone()
        assert row["ssh_host"] is None
        assert row["ssh_user"] is None
        assert row["ssh_key_path"] is None
        assert row["ssh_proxy_jump"] is None


# ---------------------------------------------------------------------------
# Migration: _migrate добавляет KIN-071 колонки в старую схему (без них)
# ---------------------------------------------------------------------------

def _old_schema_conn() -> sqlite3.Connection:
    """Создаёт соединение с минимальной 'старой' схемой без KIN-071 колонок."""
    conn = sqlite3.connect(":memory:")
    conn.row_factory = sqlite3.Row
    conn.executescript("""
        CREATE TABLE projects (
            id TEXT PRIMARY KEY,
            name TEXT NOT NULL,
            path TEXT NOT NULL,
            status TEXT DEFAULT 'active',
            language TEXT DEFAULT 'ru',
            execution_mode TEXT NOT NULL DEFAULT 'review'
        );
        CREATE TABLE tasks (
            id TEXT PRIMARY KEY,
            project_id TEXT NOT NULL,
            title TEXT NOT NULL,
            status TEXT DEFAULT 'pending',
            execution_mode TEXT
        );
    """)
    conn.commit()
    return conn


def test_migrate_adds_project_type_to_old_schema():
    """_migrate добавляет project_type в старую схему без этой колонки."""
    conn = _old_schema_conn()
    _migrate(conn)
    assert "project_type" in _cols(conn, "projects")
    conn.close()


def test_migrate_adds_ssh_host_to_old_schema():
    """_migrate добавляет ssh_host в старую схему."""
    conn = _old_schema_conn()
    _migrate(conn)
    assert "ssh_host" in _cols(conn, "projects")
    conn.close()


def test_migrate_adds_all_ssh_columns_to_old_schema():
    """_migrate добавляет все SSH-колонки разом в старую схему."""
    conn = _old_schema_conn()
    _migrate(conn)
    cols = _cols(conn, "projects")
    assert {"ssh_host", "ssh_user", "ssh_key_path", "ssh_proxy_jump", "description"}.issubset(cols)
    conn.close()


def test_migrate_is_idempotent():
    """Повторный вызов _migrate не ломает схему."""
    conn = init_db(":memory:")
    before = _cols(conn, "projects")
    _migrate(conn)
    after = _cols(conn, "projects")
    assert before == after
    conn.close()