"""
Crawl Config API handling
"""

from typing import List, Union, Optional
from enum import Enum
import uuid
import asyncio
from datetime import datetime

import pymongo
from pydantic import BaseModel, UUID4, conint
from fastapi import APIRouter, Depends, HTTPException

from users import User
from archives import Archive, MAX_CRAWL_SCALE

from db import BaseMongoModel


# ============================================================================
class ScopeType(str, Enum):
    """Crawl scope type"""

    PAGE = "page"
    PAGE_SPA = "page-spa"
    PREFIX = "prefix"
    HOST = "host"
    ANY = "any"


# ============================================================================
class Seed(BaseModel):
    """Crawl seed"""

    url: str
    scopeType: Optional[ScopeType] = ScopeType.PREFIX

    include: Union[str, List[str], None]
    exclude: Union[str, List[str], None]
    sitemap: Union[bool, str, None]
    allowHash: Optional[bool]
    depth: Optional[int]


# ============================================================================
class RawCrawlConfig(BaseModel):
    """Base Crawl Config"""

    seeds: List[Union[str, Seed]]

    scopeType: Optional[ScopeType] = ScopeType.PREFIX

    include: Union[str, List[str], None]
    exclude: Union[str, List[str], None]

    depth: Optional[int] = -1
    limit: Optional[int] = 0
    extraHops: Optional[int] = 0

    behaviorTimeout: Optional[int]

    workers: Optional[int]

    headless: Optional[bool]

    generateWACZ: Optional[bool]
    combineWARC: Optional[bool]

    logging: Optional[str]
    behaviors: Optional[str] = "autoscroll,autoplay,autofetch,siteSpecific"


# ============================================================================
class CrawlConfigIn(BaseModel):
    """CrawlConfig input model, submitted via API"""

    schedule: Optional[str] = ""
    runNow: Optional[bool] = False

    config: RawCrawlConfig

    name: Optional[str]

    colls: Optional[List[str]] = []

    crawlTimeout: Optional[int] = 0
    scale: Optional[conint(ge=1, le=MAX_CRAWL_SCALE)] = 1

    oldId: Optional[UUID4]


# ============================================================================
class CrawlConfig(BaseMongoModel):
    """Schedulable config"""

    schedule: Optional[str] = ""

    config: RawCrawlConfig

    name: Optional[str]

    created: Optional[datetime]

    colls: Optional[List[str]] = []

    crawlTimeout: Optional[int] = 0
    scale: Optional[conint(ge=1, le=MAX_CRAWL_SCALE)] = 1

    aid: UUID4

    userid: UUID4

    crawlCount: Optional[int] = 0

    lastCrawlId: Optional[str]
    lastCrawlTime: Optional[datetime]
    lastCrawlState: Optional[str]

    newId: Optional[UUID4]
    oldId: Optional[UUID4]
    inactive: Optional[bool] = False

    def get_raw_config(self):
        """ serialize config for browsertrix-crawler """
        return self.config.dict(exclude_unset=True, exclude_none=True)


# ============================================================================
class CrawlConfigOut(CrawlConfig):
    """Crawl Config Output, includes currCrawlId of running crawl"""

    currCrawlId: Optional[str]
    userName: Optional[str]


# ============================================================================
class CrawlConfigsResponse(BaseModel):
    """ model for crawl configs response """

    crawlConfigs: List[CrawlConfigOut]


# ============================================================================
class UpdateCrawlConfig(BaseModel):
    """ Update crawl config name or crawl schedule """

    name: Optional[str]
    schedule: Optional[str]
    scale: Optional[conint(ge=1, le=MAX_CRAWL_SCALE)]


# ============================================================================
# pylint: disable=too-many-instance-attributes,too-many-arguments
class CrawlConfigOps:
    """Crawl Config Operations"""

    def __init__(self, dbclient, mdb, user_manager, archive_ops, crawl_manager):
        self.dbclient = dbclient
        self.crawl_configs = mdb["crawl_configs"]
        self.user_manager = user_manager
        self.archive_ops = archive_ops
        self.crawl_manager = crawl_manager

        self.router = APIRouter(
            prefix="/crawlconfigs",
            tags=["crawlconfigs"],
            responses={404: {"description": "Not found"}},
        )

        self.coll_ops = None

        asyncio.create_task(self.init_index())

    async def init_index(self):
        """ init index for crawls db """
        await self.crawl_configs.create_index(
            [("aid", pymongo.HASHED), ("inactive", pymongo.ASCENDING)]
        )

    def set_coll_ops(self, coll_ops):
        """ set collection ops """
        self.coll_ops = coll_ops

    async def add_crawl_config(
        self, config: CrawlConfigIn, archive: Archive, user: User
    ):
        """Add new crawl config"""
        data = config.dict()
        data["aid"] = archive.id
        data["userid"] = user.id
        data["_id"] = uuid.uuid4()
        data["created"] = datetime.utcnow().replace(microsecond=0, tzinfo=None)

        if config.colls:
            data["colls"] = await self.coll_ops.find_collections(
                archive.id, config.colls
            )

        old_id = data.get("oldId")

        if old_id:
            old_config = await self.get_crawl_config(old_id, archive)
            async with await self.dbclient.start_session() as sesh:
                async with sesh.start_transaction():
                    if (
                        await self.make_inactive_or_delete(old_config, data["_id"])
                        == "deleted"
                    ):
                        data["oldId"] = old_config.oldId

                    result = await self.crawl_configs.insert_one(data)

        else:
            result = await self.crawl_configs.insert_one(data)

        crawlconfig = CrawlConfig.from_dict(data)

        new_name = await self.crawl_manager.add_crawl_config(
            crawlconfig=crawlconfig, storage=archive.storage, run_now=config.runNow
        )

        return result, new_name

    async def update_crawl_config(self, cid: uuid.UUID, update: UpdateCrawlConfig):
        """ Update name, scale and/or schedule for an existing crawl config """

        # set update query
        query = update.dict(
            exclude_unset=True, exclude_defaults=True, exclude_none=True
        )

        if len(query) == 0:
            raise HTTPException(status_code=400, detail="no_update_data")

        # update schedule in crawl manager first
        if update.schedule is not None:
            try:
                await self.crawl_manager.update_crawl_schedule(
                    str(cid), update.schedule
                )
            except Exception:
                # pylint: disable=raise-missing-from
                raise HTTPException(
                    status_code=404, detail=f"Crawl Config '{cid}' not found"
                )

        # update in db
        if not await self.crawl_configs.find_one_and_update(
            {"_id": cid, "inactive": {"$ne": True}}, {"$set": query}
        ):
            raise HTTPException(
                status_code=404, detail=f"Crawl Config '{cid}' not found"
            )

        return {"success": True}

    async def inc_crawls(
        self, cid: uuid.UUID, crawl_id: str, finished: datetime, state: str
    ):
        """ Increment Crawl Counter """
        await self.crawl_configs.find_one_and_update(
            {"_id": cid, "inactive": {"$ne": True}},
            {
                "$inc": {"crawlCount": 1},
                "$set": {
                    "lastCrawlId": crawl_id,
                    "lastCrawlTime": finished,
                    "lastCrawlState": state,
                },
            },
        )

    async def get_crawl_configs(self, archive: Archive):
        """Get all crawl configs for an archive is a member of"""
        cursor = self.crawl_configs.aggregate(
            [
                {"$match": {"aid": archive.id, "inactive": {"$ne": True}}},
                {
                    "$lookup": {
                        "from": "users",
                        "localField": "userid",
                        "foreignField": "id",
                        "as": "userName",
                    },
                },
                {"$set": {"userName": {"$arrayElemAt": ["$userName.name", 0]}}},
            ]
        )

        results = await cursor.to_list(length=1000)

        crawls = await self.crawl_manager.list_running_crawls(aid=archive.id)

        running = {}
        for crawl in crawls:
            running[crawl.cid] = crawl.id

        configs = []
        for res in results:
            config = CrawlConfigOut.from_dict(res)
            # pylint: disable=invalid-name
            config.currCrawlId = running.get(config.id)
            configs.append(config)

        return CrawlConfigsResponse(crawlConfigs=configs)

    async def get_running_crawl(self, crawlconfig: CrawlConfig):
        """ Return the id of currently running crawl for this config, if any """
        crawls = await self.crawl_manager.list_running_crawls(cid=crawlconfig.id)
        if len(crawls) == 1:
            return crawls[0].id

        return None

    async def get_crawl_config_out(self, cid: uuid.UUID, archive: Archive):
        """Return CrawlConfigOut, including state of currently running crawl, if active
        also include inactive crawl configs"""

        crawlconfig = await self.get_crawl_config(
            cid, archive, active_only=False, config_cls=CrawlConfigOut
        )
        if not crawlconfig:
            raise HTTPException(
                status_code=404, detail=f"Crawl Config '{cid}' not found"
            )

        if not crawlconfig.inactive:
            crawlconfig.currCrawlId = await self.get_running_crawl(crawlconfig)

        user = await self.user_manager.get(crawlconfig.userid)
        # pylint: disable=invalid-name
        if user:
            crawlconfig.userName = user.name

        return crawlconfig

    async def get_crawl_config(
        self,
        cid: uuid.UUID,
        archive: Archive,
        active_only: bool = True,
        config_cls=CrawlConfig,
    ):
        """Get an archive for user by unique id"""
        query = {"_id": cid, "aid": archive.id}
        if active_only:
            query["inactive"] = {"$ne": True}

        res = await self.crawl_configs.find_one(query)
        return config_cls.from_dict(res)

    async def make_inactive_or_delete(
        self, crawlconfig: CrawlConfig, new_id: uuid.UUID = None
    ):
        """Make config inactive if crawls exist, otherwise move to inactive list"""

        query = {"inactive": True}

        if new_id:
            crawlconfig.newId = query["newId"] = new_id

        if await self.get_running_crawl(crawlconfig):
            raise HTTPException(status_code=400, detail="crawl_running_cant_deactivate")

        # set to either "deleted" or "deactivated"
        status = None

        # if no crawls have been run, actually delete
        if not crawlconfig.crawlCount:
            result = await self.crawl_configs.delete_one(
                {"_id": crawlconfig.id, "aid": crawlconfig.aid}
            )

            if result.deleted_count != 1:
                raise HTTPException(status_code=404, detail="failed_to_delete")

            if crawlconfig.oldId:
                await self.crawl_configs.find_one_and_update(
                    {"_id": crawlconfig.oldId}, {"$set": query}
                )

            status = "deleted"

        else:

            if not await self.crawl_configs.find_one_and_update(
                {"_id": crawlconfig.id, "inactive": {"$ne": True}},
                {"$set": query},
            ):
                raise HTTPException(status_code=404, detail="failed_to_deactivate")

            status = "deactivated"

        # delete from crawl manager, but not from db
        await self.crawl_manager.delete_crawl_config_by_id(crawlconfig.id)

        return status

    async def do_make_inactive(self, crawlconfig: CrawlConfig):
        """ perform make_inactive in a transaction """

        async with await self.dbclient.start_session() as sesh:
            async with sesh.start_transaction():
                status = await self.make_inactive_or_delete(crawlconfig)

        return {"success": True, "status": status}


# ============================================================================
# pylint: disable=redefined-builtin,invalid-name,too-many-locals,too-many-arguments
def init_crawl_config_api(
    dbclient, mdb, user_dep, user_manager, archive_ops, crawl_manager
):
    """Init /crawlconfigs api routes"""
    ops = CrawlConfigOps(dbclient, mdb, user_manager, archive_ops, crawl_manager)

    router = ops.router

    archive_crawl_dep = archive_ops.archive_crawl_dep

    @router.get("", response_model=CrawlConfigsResponse)
    async def get_crawl_configs(archive: Archive = Depends(archive_crawl_dep)):
        return await ops.get_crawl_configs(archive)

    @router.get("/{cid}", response_model=CrawlConfigOut)
    async def get_crawl_config(cid: str, archive: Archive = Depends(archive_crawl_dep)):
        return await ops.get_crawl_config_out(uuid.UUID(cid), archive)

    @router.post("/")
    async def add_crawl_config(
        config: CrawlConfigIn,
        archive: Archive = Depends(archive_crawl_dep),
        user: User = Depends(user_dep),
    ):
        res, new_job_name = await ops.add_crawl_config(config, archive, user)
        return {"added": str(res.inserted_id), "run_now_job": new_job_name}

    @router.patch("/{cid}", dependencies=[Depends(archive_crawl_dep)])
    async def update_crawl_config(
        update: UpdateCrawlConfig,
        cid: str,
    ):
        return await ops.update_crawl_config(uuid.UUID(cid), update)

    # depcreated: to remove in favor of general patch
    @router.patch("/{cid}/schedule", dependencies=[Depends(archive_crawl_dep)])
    async def update_crawl_schedule(
        update: UpdateCrawlConfig,
        cid: str,
    ):
        return await ops.update_crawl_config(uuid.UUID(cid), update)

    @router.post("/{cid}/run")
    async def run_now(
        cid: str,
        archive: Archive = Depends(archive_crawl_dep),
        user: User = Depends(user_dep),
    ):
        crawlconfig = await ops.get_crawl_config(uuid.UUID(cid), archive)

        if not crawlconfig:
            raise HTTPException(
                status_code=404, detail=f"Crawl Config '{cid}' not found"
            )

        crawl_id = None
        try:
            crawl_id = await crawl_manager.run_crawl_config(cid, userid=str(user.id))
        except Exception as e:
            # pylint: disable=raise-missing-from
            raise HTTPException(status_code=500, detail=f"Error starting crawl: {e}")

        return {"started": crawl_id}

    @router.delete("/{cid}")
    async def make_inactive(cid: str, archive: Archive = Depends(archive_crawl_dep)):

        crawlconfig = await ops.get_crawl_config(uuid.UUID(cid), archive)

        if not crawlconfig:
            raise HTTPException(
                status_code=404, detail=f"Crawl Config '{cid}' not found"
            )

        return await ops.do_make_inactive(crawlconfig)

    archive_ops.router.include_router(router)

    return ops