import sqlite3
from abc import ABC, abstractmethod
from contextlib import closing
from logging import Logger
from pathlib import Path
from tempfile import TemporaryDirectory

import pytest
from pydantic import ValidationError

from invokeai.app.services.shared.sqlite.sqlite_database import SqliteDatabase
from invokeai.app.services.shared.sqlite_migrator.sqlite_migrator_common import (
    MigrateCallback,
    Migration,
    MigrationDependency,
    MigrationError,
    MigrationSet,
    MigrationVersionError,
)
from invokeai.app.services.shared.sqlite_migrator.sqlite_migrator_impl import (
    SQLiteMigrator,
)


@pytest.fixture
def logger() -> Logger:
    return Logger("test_sqlite_migrator")


@pytest.fixture
def memory_db_conn() -> sqlite3.Connection:
    return sqlite3.connect(":memory:")


@pytest.fixture
def memory_db_cursor(memory_db_conn: sqlite3.Connection) -> sqlite3.Cursor:
    return memory_db_conn.cursor()


@pytest.fixture
def migrator(logger: Logger) -> SQLiteMigrator:
    db = SqliteDatabase(db_path=None, logger=logger, verbose=False)
    return SQLiteMigrator(db=db)


@pytest.fixture
def no_op_migrate_callback() -> MigrateCallback:
    def no_op_migrate(cursor: sqlite3.Cursor, **kwargs) -> None:
        pass

    return no_op_migrate


@pytest.fixture
def migration_no_op(no_op_migrate_callback: MigrateCallback) -> Migration:
    return Migration(from_version=0, to_version=1, migrate_callback=no_op_migrate_callback)


@pytest.fixture
def migrate_callback_create_table_of_name() -> MigrateCallback:
    def migrate(cursor: sqlite3.Cursor, **kwargs) -> None:
        table_name = kwargs["table_name"]
        cursor.execute(f"CREATE TABLE {table_name} (id INTEGER PRIMARY KEY);")

    return migrate


@pytest.fixture
def migrate_callback_create_test_table() -> MigrateCallback:
    def migrate(cursor: sqlite3.Cursor, **kwargs) -> None:
        cursor.execute("CREATE TABLE test (id INTEGER PRIMARY KEY);")

    return migrate


@pytest.fixture
def migration_create_test_table(migrate_callback_create_test_table: MigrateCallback) -> Migration:
    return Migration(from_version=0, to_version=1, migrate_callback=migrate_callback_create_test_table)


@pytest.fixture
def failing_migration() -> Migration:
    def failing_migration(cursor: sqlite3.Cursor, **kwargs) -> None:
        raise Exception("Bad migration")

    return Migration(from_version=0, to_version=1, migrate_callback=failing_migration)


@pytest.fixture
def failing_migrate_callback() -> MigrateCallback:
    def failing_migrate(cursor: sqlite3.Cursor, **kwargs) -> None:
        raise Exception("Bad migration")

    return failing_migrate


def create_migrate(i: int) -> MigrateCallback:
    def migrate(cursor: sqlite3.Cursor, **kwargs) -> None:
        cursor.execute(f"CREATE TABLE test{i} (id INTEGER PRIMARY KEY);")

    return migrate


def test_migration_dependency_sets_value_primitive() -> None:
    dependency = MigrationDependency(name="test_dependency", dependency_type=str)
    dependency.set_value("test")
    assert dependency.value == "test"
    with pytest.raises(TypeError, match=r"Dependency test_dependency must be of type.*str"):
        dependency.set_value(1)


def test_migration_dependency_sets_value_complex() -> None:
    class SomeBase(ABC):
        @abstractmethod
        def some_method(self) -> None:
            pass

    class SomeImpl(SomeBase):
        def some_method(self) -> None:
            return

    dependency = MigrationDependency(name="test_dependency", dependency_type=SomeBase)
    with pytest.raises(TypeError, match=r"Dependency test_dependency must be of type.*SomeBase"):
        dependency.set_value(1)
    # not throwing is sufficient
    dependency.set_value(SomeImpl())


def test_migration_to_version_is_one_gt_from_version(no_op_migrate_callback: MigrateCallback) -> None:
    with pytest.raises(ValidationError, match="to_version must be one greater than from_version"):
        Migration(from_version=0, to_version=2, migrate_callback=no_op_migrate_callback)
    # not raising is sufficient
    Migration(from_version=1, to_version=2, migrate_callback=no_op_migrate_callback)


def test_migration_hash(no_op_migrate_callback: MigrateCallback) -> None:
    migration = Migration(from_version=0, to_version=1, migrate_callback=no_op_migrate_callback)
    assert hash(migration) == hash((0, 1))


def test_migration_set_add_migration(migrator: SQLiteMigrator, migration_no_op: Migration) -> None:
    migration = migration_no_op
    migrator._migration_set.register(migration)
    assert migration in migrator._migration_set._migrations


def test_migration_set_may_not_register_dupes(
    migrator: SQLiteMigrator, no_op_migrate_callback: MigrateCallback
) -> None:
    migrate_0_to_1_a = Migration(from_version=0, to_version=1, migrate_callback=no_op_migrate_callback)
    migrate_0_to_1_b = Migration(from_version=0, to_version=1, migrate_callback=no_op_migrate_callback)
    migrator._migration_set.register(migrate_0_to_1_a)
    with pytest.raises(MigrationVersionError, match=r"Migration with from_version or to_version already registered"):
        migrator._migration_set.register(migrate_0_to_1_b)
    migrate_1_to_2_a = Migration(from_version=1, to_version=2, migrate_callback=no_op_migrate_callback)
    migrate_1_to_2_b = Migration(from_version=1, to_version=2, migrate_callback=no_op_migrate_callback)
    migrator._migration_set.register(migrate_1_to_2_a)
    with pytest.raises(MigrationVersionError, match=r"Migration with from_version or to_version already registered"):
        migrator._migration_set.register(migrate_1_to_2_b)


def test_migration_set_gets_migration(migration_no_op: Migration) -> None:
    migration_set = MigrationSet()
    migration_set.register(migration_no_op)
    assert migration_set.get(0) == migration_no_op
    assert migration_set.get(1) is None


def test_migration_set_validates_migration_chain(no_op_migrate_callback: MigrateCallback) -> None:
    migration_set = MigrationSet()
    migration_set.register(Migration(from_version=1, to_version=2, migrate_callback=no_op_migrate_callback))
    with pytest.raises(MigrationError, match="Migration chain is fragmented"):
        # no migration from 0 to 1
        migration_set.validate_migration_chain()
    migration_set.register(Migration(from_version=0, to_version=1, migrate_callback=no_op_migrate_callback))
    migration_set.validate_migration_chain()
    migration_set.register(Migration(from_version=2, to_version=3, migrate_callback=no_op_migrate_callback))
    migration_set.validate_migration_chain()
    migration_set.register(Migration(from_version=4, to_version=5, migrate_callback=no_op_migrate_callback))
    with pytest.raises(MigrationError, match="Migration chain is fragmented"):
        # no migration from 3 to 4
        migration_set.validate_migration_chain()


def test_migration_set_counts_migrations(no_op_migrate_callback: MigrateCallback) -> None:
    migration_set = MigrationSet()
    assert migration_set.count == 0
    migration_set.register(Migration(from_version=0, to_version=1, migrate_callback=no_op_migrate_callback))
    assert migration_set.count == 1
    migration_set.register(Migration(from_version=1, to_version=2, migrate_callback=no_op_migrate_callback))
    assert migration_set.count == 2


def test_migration_set_gets_latest_version(no_op_migrate_callback: MigrateCallback) -> None:
    migration_set = MigrationSet()
    assert migration_set.latest_version == 0
    migration_set.register(Migration(from_version=1, to_version=2, migrate_callback=no_op_migrate_callback))
    assert migration_set.latest_version == 2
    migration_set.register(Migration(from_version=0, to_version=1, migrate_callback=no_op_migrate_callback))
    assert migration_set.latest_version == 2


def test_migration_provide_dependency_validates_name(no_op_migrate_callback: MigrateCallback) -> None:
    dependency = MigrationDependency(name="my_dependency", dependency_type=str)
    migration = Migration(
        from_version=0,
        to_version=1,
        migrate_callback=no_op_migrate_callback,
        dependencies={dependency.name: dependency},
    )
    with pytest.raises(ValueError, match="is not a dependency of this migration"):
        migration.provide_dependency("unknown_dependency_name", "banana_sushi")


def test_migration_runs_without_dependencies(
    memory_db_cursor: sqlite3.Cursor, migrate_callback_create_test_table: MigrateCallback
) -> None:
    migration = Migration(
        from_version=0,
        to_version=1,
        migrate_callback=migrate_callback_create_test_table,
    )
    migration.run(memory_db_cursor)
    memory_db_cursor.execute("SELECT name FROM sqlite_master WHERE type='table' AND name='test';")
    assert memory_db_cursor.fetchone() is not None


def test_migration_runs_with_dependencies(
    memory_db_cursor: sqlite3.Cursor, migrate_callback_create_table_of_name: MigrateCallback
) -> None:
    dependency = MigrationDependency(name="table_name", dependency_type=str)
    migration = Migration(
        from_version=0,
        to_version=1,
        migrate_callback=migrate_callback_create_table_of_name,
        dependencies={dependency.name: dependency},
    )
    with pytest.raises(MigrationError, match="Missing migration dependencies"):
        migration.run(memory_db_cursor)
    migration.provide_dependency(dependency.name, "banana_sushi")
    migration.run(memory_db_cursor)
    memory_db_cursor.execute("SELECT name FROM sqlite_master WHERE type='table' AND name='banana_sushi';")
    assert memory_db_cursor.fetchone() is not None


def test_migrator_registers_migration(migrator: SQLiteMigrator, migration_no_op: Migration) -> None:
    migration = migration_no_op
    migrator.register_migration(migration)
    assert migration in migrator._migration_set._migrations


def test_migrator_creates_migrations_table(migrator: SQLiteMigrator) -> None:
    cursor = migrator._db.conn.cursor()
    migrator._create_migrations_table(cursor)
    cursor.execute("SELECT * FROM sqlite_master WHERE type='table' AND name='migrations';")
    assert cursor.fetchone() is not None


def test_migrator_migration_sets_version(migrator: SQLiteMigrator, migration_no_op: Migration) -> None:
    cursor = migrator._db.conn.cursor()
    migrator._create_migrations_table(cursor)
    migrator.register_migration(migration_no_op)
    migrator.run_migrations()
    cursor.execute("SELECT MAX(version) FROM migrations;")
    assert cursor.fetchone()[0] == 1


def test_migrator_gets_current_version(migrator: SQLiteMigrator, migration_no_op: Migration) -> None:
    cursor = migrator._db.conn.cursor()
    assert migrator._get_current_version(cursor) == 0
    migrator._create_migrations_table(cursor)
    assert migrator._get_current_version(cursor) == 0
    migrator.register_migration(migration_no_op)
    migrator.run_migrations()
    assert migrator._get_current_version(cursor) == 1


def test_migrator_runs_single_migration(migrator: SQLiteMigrator, migration_create_test_table: Migration) -> None:
    cursor = migrator._db.conn.cursor()
    migrator._create_migrations_table(cursor)
    migrator._run_migration(migration_create_test_table)
    assert migrator._get_current_version(cursor) == 1
    cursor.execute("SELECT name FROM sqlite_master WHERE type='table' AND name='test';")
    assert cursor.fetchone() is not None


def test_migrator_runs_all_migrations_in_memory(migrator: SQLiteMigrator) -> None:
    cursor = migrator._db.conn.cursor()
    migrations = [Migration(from_version=i, to_version=i + 1, migrate_callback=create_migrate(i)) for i in range(0, 3)]
    for migration in migrations:
        migrator.register_migration(migration)
    migrator.run_migrations()
    assert migrator._get_current_version(cursor) == 3


def test_migrator_runs_all_migrations_file(logger: Logger) -> None:
    with TemporaryDirectory() as tempdir:
        original_db_path = Path(tempdir) / "invokeai.db"
        # The Migrator closes the database when it finishes; we cannot use a context manager.
        db = SqliteDatabase(db_path=original_db_path, logger=logger, verbose=False)
        migrator = SQLiteMigrator(db=db)
        migrations = [
            Migration(from_version=i, to_version=i + 1, migrate_callback=create_migrate(i)) for i in range(0, 3)
        ]
        for migration in migrations:
            migrator.register_migration(migration)
        migrator.run_migrations()
        with closing(sqlite3.connect(original_db_path)) as original_db_conn:
            original_db_cursor = original_db_conn.cursor()
            assert SQLiteMigrator._get_current_version(original_db_cursor) == 3


def test_migrator_makes_no_changes_on_failed_migration(
    migrator: SQLiteMigrator, migration_no_op: Migration, failing_migrate_callback: MigrateCallback
) -> None:
    cursor = migrator._db.conn.cursor()
    migrator.register_migration(migration_no_op)
    migrator.run_migrations()
    assert migrator._get_current_version(cursor) == 1
    migrator.register_migration(Migration(from_version=1, to_version=2, migrate_callback=failing_migrate_callback))
    with pytest.raises(MigrationError, match="Bad migration"):
        migrator.run_migrations()
    assert migrator._get_current_version(cursor) == 1


def test_idempotent_migrations(migrator: SQLiteMigrator, migration_create_test_table: Migration) -> None:
    cursor = migrator._db.conn.cursor()
    migrator.register_migration(migration_create_test_table)
    migrator.run_migrations()
    # not throwing is sufficient
    migrator.run_migrations()
    assert migrator._get_current_version(cursor) == 1