import datetime
import json
import logging
import time
from concurrent.futures import ThreadPoolExecutor

import click
from flask import Flask, current_app
from sqlalchemy.orm import Session

from configs import dify_config
from core.model_runtime.utils.encoders import jsonable_encoder
from extensions.ext_database import db
from extensions.ext_storage import storage
from models.account import Tenant
from models.model import App, Conversation, Message
from models.workflow import WorkflowNodeExecutionModel, WorkflowRun
from services.billing_service import BillingService

logger = logging.getLogger(__name__)


class ClearFreePlanTenantExpiredLogs:
    @classmethod
    def process_tenant(cls, flask_app: Flask, tenant_id: str, days: int, batch: int):
        with flask_app.app_context():
            apps = db.session.query(App).filter(App.tenant_id == tenant_id).all()
            app_ids = [app.id for app in apps]
            while True:
                with Session(db.engine).no_autoflush as session:
                    messages = (
                        session.query(Message)
                        .filter(
                            Message.app_id.in_(app_ids),
                            Message.created_at < datetime.datetime.now() - datetime.timedelta(days=days),
                        )
                        .limit(batch)
                        .all()
                    )
                    if len(messages) == 0:
                        break

                    storage.save(
                        f"free_plan_tenant_expired_logs/"
                        f"{tenant_id}/messages/{datetime.datetime.now().strftime('%Y-%m-%d')}"
                        f"-{time.time()}.json",
                        json.dumps(
                            jsonable_encoder(
                                [message.to_dict() for message in messages],
                            ),
                        ).encode("utf-8"),
                    )

                    message_ids = [message.id for message in messages]

                    # delete messages
                    session.query(Message).filter(
                        Message.id.in_(message_ids),
                    ).delete(synchronize_session=False)

                    session.commit()

                    click.echo(
                        click.style(
                            f"[{datetime.datetime.now()}] Processed {len(message_ids)} messages for tenant {tenant_id} "
                        )
                    )

            while True:
                with Session(db.engine).no_autoflush as session:
                    conversations = (
                        session.query(Conversation)
                        .filter(
                            Conversation.app_id.in_(app_ids),
                            Conversation.updated_at < datetime.datetime.now() - datetime.timedelta(days=days),
                        )
                        .limit(batch)
                        .all()
                    )

                    if len(conversations) == 0:
                        break

                    storage.save(
                        f"free_plan_tenant_expired_logs/"
                        f"{tenant_id}/conversations/{datetime.datetime.now().strftime('%Y-%m-%d')}"
                        f"-{time.time()}.json",
                        json.dumps(
                            jsonable_encoder(
                                [conversation.to_dict() for conversation in conversations],
                            ),
                        ).encode("utf-8"),
                    )

                    conversation_ids = [conversation.id for conversation in conversations]
                    session.query(Conversation).filter(
                        Conversation.id.in_(conversation_ids),
                    ).delete(synchronize_session=False)
                    session.commit()

                    click.echo(
                        click.style(
                            f"[{datetime.datetime.now()}] Processed {len(conversation_ids)}"
                            f" conversations for tenant {tenant_id}"
                        )
                    )

            while True:
                with Session(db.engine).no_autoflush as session:
                    workflow_node_executions = (
                        session.query(WorkflowNodeExecutionModel)
                        .filter(
                            WorkflowNodeExecutionModel.tenant_id == tenant_id,
                            WorkflowNodeExecutionModel.created_at
                            < datetime.datetime.now() - datetime.timedelta(days=days),
                        )
                        .limit(batch)
                        .all()
                    )

                    if len(workflow_node_executions) == 0:
                        break

                    # save workflow node executions
                    storage.save(
                        f"free_plan_tenant_expired_logs/"
                        f"{tenant_id}/workflow_node_executions/{datetime.datetime.now().strftime('%Y-%m-%d')}"
                        f"-{time.time()}.json",
                        json.dumps(
                            jsonable_encoder(workflow_node_executions),
                        ).encode("utf-8"),
                    )

                    workflow_node_execution_ids = [
                        workflow_node_execution.id for workflow_node_execution in workflow_node_executions
                    ]

                    # delete workflow node executions
                    session.query(WorkflowNodeExecutionModel).filter(
                        WorkflowNodeExecutionModel.id.in_(workflow_node_execution_ids),
                    ).delete(synchronize_session=False)
                    session.commit()

                    click.echo(
                        click.style(
                            f"[{datetime.datetime.now()}] Processed {len(workflow_node_execution_ids)}"
                            f" workflow node executions for tenant {tenant_id}"
                        )
                    )

            while True:
                with Session(db.engine).no_autoflush as session:
                    workflow_runs = (
                        session.query(WorkflowRun)
                        .filter(
                            WorkflowRun.tenant_id == tenant_id,
                            WorkflowRun.created_at < datetime.datetime.now() - datetime.timedelta(days=days),
                        )
                        .limit(batch)
                        .all()
                    )

                    if len(workflow_runs) == 0:
                        break

                    # save workflow runs

                    storage.save(
                        f"free_plan_tenant_expired_logs/"
                        f"{tenant_id}/workflow_runs/{datetime.datetime.now().strftime('%Y-%m-%d')}"
                        f"-{time.time()}.json",
                        json.dumps(
                            jsonable_encoder(
                                [workflow_run.to_dict() for workflow_run in workflow_runs],
                            ),
                        ).encode("utf-8"),
                    )

                    workflow_run_ids = [workflow_run.id for workflow_run in workflow_runs]

                    # delete workflow runs
                    session.query(WorkflowRun).filter(
                        WorkflowRun.id.in_(workflow_run_ids),
                    ).delete(synchronize_session=False)
                    session.commit()

    @classmethod
    def process(cls, days: int, batch: int, tenant_ids: list[str]):
        """
        Clear free plan tenant expired logs.
        """

        click.echo(click.style("Clearing free plan tenant expired logs", fg="white"))
        ended_at = datetime.datetime.now()
        started_at = datetime.datetime(2023, 4, 3, 8, 59, 24)
        current_time = started_at

        with Session(db.engine) as session:
            total_tenant_count = session.query(Tenant.id).count()

        click.echo(click.style(f"Total tenant count: {total_tenant_count}", fg="white"))

        handled_tenant_count = 0

        thread_pool = ThreadPoolExecutor(max_workers=10)

        def process_tenant(flask_app: Flask, tenant_id: str) -> None:
            try:
                if (
                    not dify_config.BILLING_ENABLED
                    or BillingService.get_info(tenant_id)["subscription"]["plan"] == "sandbox"
                ):
                    # only process sandbox tenant
                    cls.process_tenant(flask_app, tenant_id, days, batch)
            except Exception:
                logger.exception(f"Failed to process tenant {tenant_id}")
            finally:
                nonlocal handled_tenant_count
                handled_tenant_count += 1
                if handled_tenant_count % 100 == 0:
                    click.echo(
                        click.style(
                            f"[{datetime.datetime.now()}] "
                            f"Processed {handled_tenant_count} tenants "
                            f"({(handled_tenant_count / total_tenant_count) * 100:.1f}%), "
                            f"{handled_tenant_count}/{total_tenant_count}",
                            fg="green",
                        )
                    )

        futures = []

        if tenant_ids:
            for tenant_id in tenant_ids:
                futures.append(
                    thread_pool.submit(
                        process_tenant,
                        current_app._get_current_object(),  # type: ignore[attr-defined]
                        tenant_id,
                    )
                )
        else:
            while current_time < ended_at:
                click.echo(
                    click.style(f"Current time: {current_time}, Started at: {datetime.datetime.now()}", fg="white")
                )
                # Initial interval of 1 day, will be dynamically adjusted based on tenant count
                interval = datetime.timedelta(days=1)
                # Process tenants in this batch
                with Session(db.engine) as session:
                    # Calculate tenant count in next batch with current interval
                    # Try different intervals until we find one with a reasonable tenant count
                    test_intervals = [
                        datetime.timedelta(days=1),
                        datetime.timedelta(hours=12),
                        datetime.timedelta(hours=6),
                        datetime.timedelta(hours=3),
                        datetime.timedelta(hours=1),
                    ]

                    for test_interval in test_intervals:
                        tenant_count = (
                            session.query(Tenant.id)
                            .filter(Tenant.created_at.between(current_time, current_time + test_interval))
                            .count()
                        )
                        if tenant_count <= 100:
                            interval = test_interval
                            break
                    else:
                        # If all intervals have too many tenants, use minimum interval
                        interval = datetime.timedelta(hours=1)

                    # Adjust interval to target ~100 tenants per batch
                    if tenant_count > 0:
                        # Scale interval based on ratio to target count
                        interval = min(
                            datetime.timedelta(days=1),  # Max 1 day
                            max(
                                datetime.timedelta(hours=1),  # Min 1 hour
                                interval * (100 / tenant_count),  # Scale to target 100
                            ),
                        )

                    batch_end = min(current_time + interval, ended_at)

                    rs = (
                        session.query(Tenant.id)
                        .filter(Tenant.created_at.between(current_time, batch_end))
                        .order_by(Tenant.created_at)
                    )

                    tenants = []
                    for row in rs:
                        tenant_id = str(row.id)
                        try:
                            tenants.append(tenant_id)
                        except Exception:
                            logger.exception(f"Failed to process tenant {tenant_id}")
                            continue

                        futures.append(
                            thread_pool.submit(
                                process_tenant,
                                current_app._get_current_object(),  # type: ignore[attr-defined]
                                tenant_id,
                            )
                        )

                current_time = batch_end

        # wait for all threads to finish
        for future in futures:
            future.result()
