# Copyright Materialize, Inc. and contributors. All rights reserved.
#
# Use of this software is governed by the Business Source License
# included in the LICENSE file at the root of this repository.
#
# As of the Change Date specified in that file, in accordance with
# the Business Source License, use of this software will be governed
# by the Apache License, Version 2.0.

import random
import time
from collections.abc import Iterator
from enum import Enum
from typing import TYPE_CHECKING

from materialize.data_ingest.definition import Definition
from materialize.data_ingest.field import Field
from materialize.data_ingest.rowlist import RowList
from materialize.data_ingest.transaction import Transaction
from materialize.mzcompose import get_default_system_parameters
from materialize.mzcompose.composition import Composition
from materialize.mzcompose.services.materialized import (
    LEADER_STATUS_HEALTHCHECK,
    DeploymentStatus,
    Materialized,
)

if TYPE_CHECKING:
    from materialize.data_ingest.workload import Workload


class TransactionSize(Enum):
    SINGLE_OPERATION = 1
    HUGE = 1_000_000_000


class TransactionDef:
    operations: list[Definition]
    size: TransactionSize

    def __init__(
        self,
        operations: list[Definition],
        size: TransactionSize = TransactionSize.SINGLE_OPERATION,
    ):
        self.operations = operations
        self.size = size

    def generate(self, fields: list[Field]) -> Iterator[Transaction | None]:
        full_rowlist: list[RowList] = []
        for definition in self.operations:
            for i, rowlist in enumerate(definition.generate(fields)):
                full_rowlist.append(rowlist)
                if i + 1 == self.size.value:
                    yield Transaction(full_rowlist)
                    full_rowlist = []
        if full_rowlist:
            yield Transaction(full_rowlist)


class RestartMz(TransactionDef):
    composition: Composition
    probability: float
    workload: "Workload"

    def __init__(
        self,
        composition: Composition,
        probability: float,
        workload: "Workload",
        azurite: bool,
    ):
        self.composition = composition
        self.probability = probability
        self.workload = workload
        self.azurite = azurite

    def generate(self, fields: list[Field]) -> Iterator[Transaction | None]:
        if random.random() < self.probability:
            ports = (
                ["16875:6875"]
                if self.workload.mz_service == "materialized"
                else ["26875:6875"]
            )

            with self.composition.override(
                Materialized(
                    name=self.workload.mz_service,
                    ports=ports,
                    external_blob_store=True,
                    blob_store_is_azure=self.azurite,
                    external_metadata_store=True,
                    system_parameter_defaults=get_default_system_parameters(
                        zero_downtime=True
                    ),
                    additional_system_parameter_defaults={
                        "unsafe_enable_table_keys": "true"
                    },
                    deploy_generation=self.workload.deploy_generation,
                    sanity_restart=False,
                ),
            ):
                self.composition.kill(self.workload.mz_service)
                time.sleep(1)
                self.composition.up(self.workload.mz_service)
        yield None


class ZeroDowntimeDeploy(TransactionDef):
    composition: Composition
    probability: float
    workload: "Workload"

    def __init__(
        self,
        composition: Composition,
        probability: float,
        workload: "Workload",
        azurite: bool,
    ):
        self.composition = composition
        self.probability = probability
        self.workload = workload
        self.azurite = azurite

    def generate(self, fields: list[Field]) -> Iterator[Transaction | None]:
        if random.random() < self.probability:
            self.workload.deploy_generation += 1

            if self.workload.deploy_generation % 2 == 0:
                self.workload.mz_service = "materialized"
                ports = ["16875:6875"]
            else:
                self.workload.mz_service = "materialized2"
                ports = ["26875:6875"]

            print(
                f"Deploying generation {self.workload.deploy_generation} on {self.workload.mz_service}"
            )

            with self.composition.override(
                Materialized(
                    name=self.workload.mz_service,
                    ports=ports,
                    external_blob_store=True,
                    blob_store_is_azure=self.azurite,
                    external_metadata_store=True,
                    system_parameter_defaults=get_default_system_parameters(
                        zero_downtime=True
                    ),
                    additional_system_parameter_defaults={
                        "unsafe_enable_table_keys": "true"
                    },
                    deploy_generation=self.workload.deploy_generation,
                    restart="on-failure",
                    healthcheck=LEADER_STATUS_HEALTHCHECK,
                    sanity_restart=False,
                ),
            ):
                self.composition.up(self.workload.mz_service, detach=True)
                self.composition.await_mz_deployment_status(
                    DeploymentStatus.READY_TO_PROMOTE, self.workload.mz_service
                )
                self.composition.promote_mz(self.workload.mz_service)
                self.composition.await_mz_deployment_status(
                    DeploymentStatus.IS_LEADER, self.workload.mz_service
                )

        yield None