"""Tests for core/db.py — schema and migration (KIN-071, KIN-073)."""

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()


# ---------------------------------------------------------------------------
# Migration KIN-UI-002: рекреация таблицы на минимальной схеме не падает
# ---------------------------------------------------------------------------

def test_migrate_recreates_table_without_operationalerror():
    """_migrate не бросает OperationalError при рекреации projects на минимальной схеме.

    Регрессионный тест KIN-UI-002: INSERT SELECT в блоке KIN-ARCH-003 ранее
    падал на отсутствующих колонках (tech_stack, priority, pm_prompt и др.).
    """
    conn = _old_schema_conn()  # path NOT NULL — триггер рекреации
    try:
        _migrate(conn)
    except Exception as exc:
        pytest.fail(f"_migrate raised {type(exc).__name__}: {exc}")
    conn.close()


def test_migrate_path_becomes_nullable_on_old_schema():
    """После миграции старой схемы (path NOT NULL) колонка path становится nullable."""
    conn = _old_schema_conn()
    _migrate(conn)
    path_col = next(
        r for r in conn.execute("PRAGMA table_info(projects)").fetchall()
        if r[1] == "path"
    )
    assert path_col[3] == 0, "path должна быть nullable после миграции KIN-ARCH-003"
    conn.close()


def test_migrate_preserves_existing_rows_on_recreation():
    """Рекреация таблицы сохраняет существующие строки."""
    conn = _old_schema_conn()
    conn.execute(
        "INSERT INTO projects (id, name, path, status) VALUES ('p1', 'MyProj', '/p', 'active')"
    )
    conn.commit()
    _migrate(conn)
    row = conn.execute("SELECT id, name, path, status FROM projects WHERE id='p1'").fetchone()
    assert row is not None
    assert row["name"] == "MyProj"
    assert row["path"] == "/p"
    assert row["status"] == "active"
    conn.close()


def test_migrate_adds_missing_columns_before_recreation():
    """_migrate добавляет tech_stack, priority, pm_prompt, claude_md_path, forgejo_repo, created_at перед рекреацией."""
    conn = _old_schema_conn()
    _migrate(conn)
    cols = _cols(conn, "projects")
    required = {"tech_stack", "priority", "pm_prompt", "claude_md_path", "forgejo_repo", "created_at"}
    assert required.issubset(cols), f"Отсутствуют колонки: {required - cols}"
    conn.close()


def test_migrate_operations_project_with_null_path():
    """После миграции можно вставить operations-проект с path=NULL."""
    conn = _old_schema_conn()
    _migrate(conn)
    conn.execute(
        "INSERT INTO projects (id, name, path, project_type) VALUES ('ops1', 'Ops', NULL, 'operations')"
    )
    conn.commit()
    row = conn.execute("SELECT path, project_type FROM projects WHERE id='ops1'").fetchone()
    assert row["path"] is None
    assert row["project_type"] == "operations"
    conn.close()


# ---------------------------------------------------------------------------
# Schema KIN-073: acceptance_criteria в таблице tasks
# ---------------------------------------------------------------------------

class TestTasksAcceptanceCriteriaSchema:
    """Колонка acceptance_criteria присутствует в таблице tasks."""

    def test_schema_has_acceptance_criteria_column(self, conn):
        assert "acceptance_criteria" in _cols(conn, "tasks")

    def test_acceptance_criteria_defaults_to_null(self, conn):
        """Создание задачи без acceptance_criteria — поле NULL (nullable)."""
        conn.execute(
            "INSERT INTO projects (id, name, path) VALUES ('p1', 'P', '/p')"
        )
        conn.execute(
            "INSERT INTO tasks (id, project_id, title) VALUES ('t1', 'p1', 'My Task')"
        )
        conn.commit()
        row = conn.execute(
            "SELECT acceptance_criteria FROM tasks WHERE id='t1'"
        ).fetchone()
        assert row["acceptance_criteria"] is None

    def test_create_task_with_acceptance_criteria_saves_field(self, conn):
        """Создание задачи с acceptance_criteria — значение сохраняется в БД."""
        conn.execute(
            "INSERT INTO projects (id, name, path) VALUES ('p2', 'P', '/p')"
        )
        criteria = "Поле должно сохраняться. GET возвращает значение."
        conn.execute(
            "INSERT INTO tasks (id, project_id, title, acceptance_criteria)"
            " VALUES ('t2', 'p2', 'Task with criteria', ?)",
            (criteria,),
        )
        conn.commit()
        row = conn.execute(
            "SELECT acceptance_criteria FROM tasks WHERE id='t2'"
        ).fetchone()
        assert row["acceptance_criteria"] == criteria

    def test_get_task_returns_acceptance_criteria(self, conn):
        """SELECT задачи возвращает acceptance_criteria (критерий приёмки 3)."""
        conn.execute(
            "INSERT INTO projects (id, name, path) VALUES ('p3', 'P', '/p')"
        )
        conn.execute(
            "INSERT INTO tasks (id, project_id, title, acceptance_criteria)"
            " VALUES ('t3', 'p3', 'T', 'AC value')",
        )
        conn.commit()
        row = conn.execute("SELECT * FROM tasks WHERE id='t3'").fetchone()
        assert row["acceptance_criteria"] == "AC value"


# ---------------------------------------------------------------------------
# Migration KIN-073: _migrate добавляет acceptance_criteria в старую схему
# ---------------------------------------------------------------------------

def test_migrate_adds_acceptance_criteria_to_old_schema():
    """_migrate добавляет acceptance_criteria в tasks если колонки нет."""
    conn = _old_schema_conn()
    _migrate(conn)
    assert "acceptance_criteria" in _cols(conn, "tasks")
    conn.close()


def test_migrate_acceptance_criteria_is_nullable_after_migration():
    """После миграции acceptance_criteria nullable — старые строки не ломаются."""
    conn = _old_schema_conn()
    conn.execute(
        "INSERT INTO projects (id, name, path) VALUES ('pm', 'P', '/p')"
    )
    conn.execute(
        "INSERT INTO tasks (id, project_id, title) VALUES ('tm', 'pm', 'Old Task')"
    )
    conn.commit()
    _migrate(conn)
    row = conn.execute("SELECT acceptance_criteria FROM tasks WHERE id='tm'").fetchone()
    assert row["acceptance_criteria"] is None
    conn.close()


# ---------------------------------------------------------------------------
# Regression KIN-FIX-014: guard "if pipelines in existing_tables"
# Финальный UPDATE pipelines в _migrate не должен падать на схемах без этой таблицы.
# ---------------------------------------------------------------------------

def _old_schema_with_pipelines_conn() -> sqlite3.Connection:
    """Минимальная схема С таблицей pipelines (dept_sub + running записи)."""
    conn = sqlite3.connect(":memory:")
    conn.row_factory = sqlite3.Row
    conn.executescript("""
        CREATE TABLE projects (
            id TEXT PRIMARY KEY,
            name TEXT NOT NULL,
            path TEXT,
            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
        );
        CREATE TABLE pipelines (
            id INTEGER PRIMARY KEY AUTOINCREMENT,
            task_id TEXT NOT NULL,
            project_id TEXT NOT NULL,
            route_type TEXT NOT NULL,
            steps TEXT NOT NULL DEFAULT '[]',
            status TEXT DEFAULT 'running'
        );
    """)
    conn.commit()
    return conn


def test_migrate_without_pipelines_table_does_not_raise():
    """Regression KIN-FIX-014: _migrate на схеме без таблицы pipelines не бросает исключение.

    До фикса: безусловный UPDATE pipelines падал с 'no such table: pipelines'
    на тест-фикстурах с минимальной схемой (только projects + tasks).
    """
    conn = _old_schema_conn()
    try:
        _migrate(conn)
    except Exception as exc:
        pytest.fail(
            f"_migrate raised {type(exc).__name__} при отсутствии таблицы pipelines: {exc}"
        )
    conn.close()


def test_migrate_sets_orphaned_dept_sub_running_to_failed():
    """_migrate обновляет dept_sub pipelines со статусом 'running' → 'failed'.

    Исправляет призрачные записи от двойного создания пайплайна (KIN-ARCH-012).
    """
    conn = _old_schema_with_pipelines_conn()
    conn.execute(
        "INSERT INTO projects (id, name) VALUES ('p1', 'P')"
    )
    conn.execute(
        "INSERT INTO tasks (id, project_id, title) VALUES ('t1', 'p1', 'T')"
    )
    conn.execute(
        "INSERT INTO pipelines (task_id, project_id, route_type, status)"
        " VALUES ('t1', 'p1', 'dept_sub', 'running')"
    )
    conn.commit()

    _migrate(conn)

    row = conn.execute("SELECT status FROM pipelines WHERE route_type = 'dept_sub'").fetchone()
    assert row["status"] == "failed", (
        "dept_sub pipeline со статусом 'running' должен стать 'failed' после миграции"
    )
    conn.close()


def test_migrate_preserves_non_dept_sub_and_non_running_pipelines():
    """_migrate не трогает pipelines, которые не являются dept_sub+running."""
    conn = _old_schema_with_pipelines_conn()
    conn.execute("INSERT INTO projects (id, name) VALUES ('p2', 'P')")
    conn.execute("INSERT INTO tasks (id, project_id, title) VALUES ('t2', 'p2', 'T')")
    # dept_sub но уже completed — не трогать
    conn.execute(
        "INSERT INTO pipelines (task_id, project_id, route_type, status)"
        " VALUES ('t2', 'p2', 'dept_sub', 'completed')"
    )
    # обычный running pipeline другого типа — не трогать
    conn.execute(
        "INSERT INTO pipelines (task_id, project_id, route_type, status)"
        " VALUES ('t2', 'p2', 'direct', 'running')"
    )
    conn.commit()

    _migrate(conn)

    rows = {
        r["route_type"]: r["status"]
        for r in conn.execute("SELECT route_type, status FROM pipelines").fetchall()
    }
    assert rows["dept_sub"] == "completed", "completed pipeline не должен меняться"
    assert rows["direct"] == "running", "non-dept_sub running pipeline не должен меняться"
    conn.close()


# ---------------------------------------------------------------------------
# Schema KIN-OBS-014: pid INTEGER присутствует в SCHEMA-строке CREATE TABLE pipelines
# ---------------------------------------------------------------------------

def test_schema_string_contains_pid_integer_in_pipelines_ddl():
    """Регрессия KIN-OBS-014: SCHEMA-строка содержит 'pid INTEGER' в теле CREATE TABLE pipelines.

    До фикса поле было только в _migrate(), но отсутствовало в SCHEMA —
    при свежей инициализации БД колонка не создавалась.
    Тест парсит блок CREATE TABLE pipelines напрямую из SCHEMA.
    """
    from core.db import SCHEMA
    start = SCHEMA.index("CREATE TABLE IF NOT EXISTS pipelines")
    end = SCHEMA.index(");", start) + 2
    pipelines_ddl = SCHEMA[start:end]
    assert "pid INTEGER" in pipelines_ddl, (
        "pid INTEGER не найден в SCHEMA CREATE TABLE pipelines — "
        "поле должно быть в SCHEMA (core/db.py строки ~133-148), а не только в _migrate()"
    )


# ---------------------------------------------------------------------------
# Schema KIN-OBS-018: pid INTEGER присутствует в таблице pipelines
# ---------------------------------------------------------------------------

class TestPipelinesSchemaKinObs018:
    """PRAGMA table_info(pipelines) должен содержать kolонку pid INTEGER."""

    def test_schema_has_pid_column(self, conn):
        """Свежая инициализация: pipelines содержит колонку pid."""
        assert "pid" in _cols(conn, "pipelines")

    def test_pid_defaults_to_null(self, conn):
        """Вставка pipeline без pid — значение NULL."""
        conn.execute(
            "INSERT INTO projects (id, name, path) VALUES ('p_pid', 'P', '/p')"
        )
        conn.execute(
            "INSERT INTO tasks (id, project_id, title) VALUES ('t_pid', 'p_pid', 'T')"
        )
        conn.execute(
            "INSERT INTO pipelines (task_id, project_id, route_type, steps)"
            " VALUES ('t_pid', 'p_pid', 'direct', '[]')"
        )
        conn.commit()
        row = conn.execute(
            "SELECT pid FROM pipelines WHERE task_id='t_pid'"
        ).fetchone()
        assert row["pid"] is None

    def test_pid_can_store_integer_value(self, conn):
        """Вставка pipeline с pid — значение сохраняется в БД."""
        conn.execute(
            "INSERT INTO projects (id, name, path) VALUES ('p_pid2', 'P', '/p')"
        )
        conn.execute(
            "INSERT INTO tasks (id, project_id, title) VALUES ('t_pid2', 'p_pid2', 'T')"
        )
        conn.execute(
            "INSERT INTO pipelines (task_id, project_id, route_type, steps, pid)"
            " VALUES ('t_pid2', 'p_pid2', 'direct', '[]', 12345)"
        )
        conn.commit()
        row = conn.execute(
            "SELECT pid FROM pipelines WHERE task_id='t_pid2'"
        ).fetchone()
        assert row["pid"] == 12345


# ---------------------------------------------------------------------------
# Migration KIN-OBS-018: _migrate добавляет pid в существующие БД без этой колонки
# Конвенция #384: три теста для _migrate guard
# ---------------------------------------------------------------------------

def test_migrate_adds_pid_to_pipelines_without_column():
    """_migrate добавляет pid в таблицу pipelines если колонки нет."""
    conn = _old_schema_with_pipelines_conn()  # схема без pid
    _migrate(conn)
    assert "pid" in _cols(conn, "pipelines")
    conn.close()


def test_migrate_pid_is_nullable_after_migration():
    """После миграции pid nullable — существующие строки не ломаются (pid=NULL)."""
    conn = _old_schema_with_pipelines_conn()
    conn.execute("INSERT INTO projects (id, name) VALUES ('pm_pid', 'P')")
    conn.execute("INSERT INTO tasks (id, project_id, title) VALUES ('tm_pid', 'pm_pid', 'T')")
    conn.execute(
        "INSERT INTO pipelines (task_id, project_id, route_type, status)"
        " VALUES ('tm_pid', 'pm_pid', 'direct', 'completed')"
    )
    conn.commit()
    _migrate(conn)
    row = conn.execute("SELECT pid FROM pipelines WHERE task_id='tm_pid'").fetchone()
    assert row["pid"] is None
    conn.close()


def test_migrate_pid_guard_is_idempotent():
    """Повторный вызов _migrate не ломает схему pipelines (guard idempotent)."""
    conn = _old_schema_with_pipelines_conn()
    _migrate(conn)
    before = _cols(conn, "pipelines")
    _migrate(conn)
    after = _cols(conn, "pipelines")
    assert before == after
    assert "pid" in after
    conn.close()


# ---------------------------------------------------------------------------
# Schema KIN-084: pipeline_log в SCHEMA-строке и _migrate()
# Конвенция #387: DDL-парсинг SCHEMA-строки
# ---------------------------------------------------------------------------

def test_schema_string_contains_pipeline_log_table():
    """Регрессия KIN-084: SCHEMA-строка содержит CREATE TABLE pipeline_log."""
    from core.db import SCHEMA
    assert "CREATE TABLE IF NOT EXISTS pipeline_log" in SCHEMA


def test_schema_pipeline_log_has_required_columns():
    """SCHEMA pipeline_log содержит все обязательные колонки."""
    from core.db import SCHEMA
    start = SCHEMA.index("CREATE TABLE IF NOT EXISTS pipeline_log")
    end = SCHEMA.index(");", start) + 2
    ddl = SCHEMA[start:end]
    assert "pipeline_id INTEGER" in ddl
    assert "ts " in ddl
    assert "level " in ddl
    assert "message " in ddl
    assert "extra_json " in ddl


def test_migrate_creates_pipeline_log_on_fresh_init(conn):
    """Свежая инициализация: pipeline_log существует."""
    tables = {r["name"] for r in conn.execute("SELECT name FROM sqlite_master WHERE type='table'").fetchall()}
    assert "pipeline_log" in tables


def test_migrate_creates_pipeline_log_if_missing():
    """_migrate создаёт pipeline_log если таблица отсутствует в старой БД."""
    conn = _old_schema_conn()
    _migrate(conn)
    tables = {r["name"] for r in conn.execute("SELECT name FROM sqlite_master WHERE type='table'").fetchall()}
    assert "pipeline_log" in tables
    conn.close()