import json
import logging
import os
import os.path
from datetime import datetime

from tlz import first, merge
from tornado import escape
from tornado.websocket import WebSocketHandler

from dask.utils import format_bytes, format_time

from ...diagnostics.websocket import WebsocketPlugin
from ...metrics import time
from ...utils import log_errors
from ..utils import RequestHandler, redirect

ns = {
    func.__name__: func
    for func in [format_bytes, format_time, datetime.fromtimestamp, time]
}

rel_path_statics = {"rel_path_statics": "../../.."}


logger = logging.getLogger(__name__)


class Workers(RequestHandler):
    def get(self):
        with log_errors():
            self.render(
                "workers.html",
                title="Workers",
                scheduler=self.server,
                **merge(
                    self.server.__dict__,
                    self.server.__pdict__,
                    ns,
                    self.extra,
                    rel_path_statics,
                ),
            )


class Worker(RequestHandler):
    def get(self, worker):
        worker = escape.url_unescape(worker)
        if worker not in self.server.workers:
            self.send_error(404)
            return
        with log_errors():
            self.render(
                "worker.html",
                title="Worker: " + worker,
                scheduler=self.server,
                Worker=worker,
                **merge(
                    self.server.__dict__,
                    self.server.__pdict__,
                    ns,
                    self.extra,
                    rel_path_statics,
                ),
            )


class Task(RequestHandler):
    def get(self, task):
        task = escape.url_unescape(task)
        if task not in self.server.tasks:
            self.send_error(404)
            return
        with log_errors():
            self.render(
                "task.html",
                title="Task: " + task,
                Task=task,
                scheduler=self.server,
                **merge(
                    self.server.__dict__,
                    self.server.__pdict__,
                    ns,
                    self.extra,
                    rel_path_statics,
                ),
            )


class Logs(RequestHandler):
    def get(self):
        with log_errors():
            logs = self.server.get_logs()
            self.render(
                "logs.html",
                title="Logs",
                logs=logs,
                **merge(self.extra, rel_path_statics),
            )


class WorkerLogs(RequestHandler):
    async def get(self, worker):
        with log_errors():
            worker = escape.url_unescape(worker)
            logs = await self.server.get_worker_logs(workers=[worker])
            logs = logs[worker]
            self.render(
                "logs.html",
                title="Logs: " + worker,
                logs=logs,
                **merge(self.extra, rel_path_statics),
            )


class WorkerCallStacks(RequestHandler):
    async def get(self, worker):
        with log_errors():
            worker = escape.url_unescape(worker)
            keys = self.server.processing[worker]
            call_stack = await self.server.get_call_stack(keys=keys)
            self.render(
                "call-stack.html",
                title="Call Stacks: " + worker,
                call_stack=call_stack,
                **merge(self.extra, rel_path_statics),
            )


class TaskCallStack(RequestHandler):
    async def get(self, key):
        with log_errors():
            key = escape.url_unescape(key)
            call_stack = await self.server.get_call_stack(keys=[key])
            if not call_stack:
                self.write(
                    "<p>Task not actively running. "
                    "It may be finished or not yet started</p>"
                )
            else:
                self.render(
                    "call-stack.html",
                    title="Call Stack: " + key,
                    call_stack=call_stack,
                    **merge(self.extra, rel_path_statics),
                )


class IndividualPlots(RequestHandler):
    def get(self):
        try:
            from bokeh.server.tornado import BokehTornado

            bokeh_application = first(
                app
                for app in self.server.http_application.applications
                if isinstance(app, BokehTornado)
            )
            individual_bokeh = {
                uri.strip("/").replace("-", " ").title(): uri
                for uri in bokeh_application.app_paths
                if uri.lstrip("/").startswith("individual-")
                and not uri.endswith(".json")
            }
            individual_static = {
                uri.strip("/")
                .replace(".html", "")
                .replace("-", " ")
                .title(): "/statics/"
                + uri
                for uri in os.listdir(
                    os.path.join(os.path.dirname(__file__), "..", "static")
                )
                if uri.lstrip("/").startswith("individual-") and uri.endswith(".html")
            }
            result = {**individual_bokeh, **individual_static}
            self.write(result)
        except (ImportError, StopIteration):
            self.write({})


class EventstreamHandler(WebSocketHandler):
    def initialize(self, dask_server=None, extra=None):
        self.server = dask_server
        self.extra = extra or {}
        self.plugin = WebsocketPlugin(self, self.server)
        self.server.add_plugin(self.plugin)

    def send(self, name, data):
        data["name"] = name
        for k in list(data):
            # Drop bytes objects for now
            if isinstance(data[k], bytes):
                del data[k]
        self.write_message(data)

    def open(self):
        for worker in self.server.workers:
            self.plugin.add_worker(self.server, worker)

    def on_message(self, message):
        message = json.loads(message)
        if message["name"] == "ping":
            self.send("pong", {"timestamp": str(datetime.now())})

    def on_close(self):
        self.server.remove_plugin(self.plugin)


routes = [
    (r"info", redirect("info/main/workers.html"), {}),
    (r"info/main/workers.html", Workers, {}),
    (r"info/worker/(.*).html", Worker, {}),
    (r"info/task/(.*).html", Task, {}),
    (r"info/main/logs.html", Logs, {}),
    (r"info/call-stacks/(.*).html", WorkerCallStacks, {}),
    (r"info/call-stack/(.*).html", TaskCallStack, {}),
    (r"info/logs/(.*).html", WorkerLogs, {}),
    (r"individual-plots.json", IndividualPlots, {}),
    (r"eventstream", EventstreamHandler, {}),
]
