__package__ = 'archivebox.api'

from uuid import UUID
from typing import List, Optional
from datetime import datetime
from django.utils import timezone

from django.db.models import Q
from django.contrib.auth import get_user_model

from ninja import Router, Schema
from ninja.errors import HttpError

from archivebox.core.models import Snapshot
from archivebox.crawls.models import Crawl

from .auth import API_AUTH_METHODS

router = Router(tags=['Crawl Models'], auth=API_AUTH_METHODS)


class CrawlSchema(Schema):
    TYPE: str = 'crawls.models.Crawl'

    id: UUID

    modified_at: datetime
    created_at: datetime
    created_by_id: str
    created_by_username: str

    status: str
    retry_at: datetime | None

    urls: str
    max_depth: int
    tags_str: str
    config: dict

    # snapshots: List[SnapshotSchema]

    @staticmethod
    def resolve_created_by_id(obj):
        return str(obj.created_by_id)

    @staticmethod
    def resolve_created_by_username(obj):
        User = get_user_model()
        return User.objects.get(id=obj.created_by_id).username

    @staticmethod
    def resolve_snapshots(obj, context):
        if context['request'].with_snapshots:
            return obj.snapshot_set.all().distinct()
        return Snapshot.objects.none()


class CrawlUpdateSchema(Schema):
    status: str | None = None
    retry_at: datetime | None = None
    tags: Optional[List[str]] = None
    tags_str: str | None = None


class CrawlCreateSchema(Schema):
    urls: List[str]
    max_depth: int = 0
    tags: Optional[List[str]] = None
    tags_str: str = ''
    label: str = ''
    notes: str = ''
    config: dict = {}


class CrawlDeleteResponseSchema(Schema):
    success: bool
    crawl_id: str
    deleted_count: int
    deleted_snapshots: int


def normalize_tag_list(tags: Optional[List[str]] = None, tags_str: str = '') -> List[str]:
    if tags is not None:
        return [tag.strip() for tag in tags if tag and tag.strip()]
    return [tag.strip() for tag in tags_str.split(',') if tag.strip()]


@router.get("/crawls", response=List[CrawlSchema], url_name="get_crawls")
def get_crawls(request):
    return Crawl.objects.all().distinct()


@router.post("/crawls", response=CrawlSchema, url_name="create_crawl")
def create_crawl(request, data: CrawlCreateSchema):
    urls = [url.strip() for url in data.urls if url and url.strip()]
    if not urls:
        raise HttpError(400, 'At least one URL is required')
    if data.max_depth not in (0, 1, 2, 3, 4):
        raise HttpError(400, 'max_depth must be between 0 and 4')

    tags = normalize_tag_list(data.tags, data.tags_str)
    crawl = Crawl.objects.create(
        urls='\n'.join(urls),
        max_depth=data.max_depth,
        tags_str=','.join(tags),
        label=data.label,
        notes=data.notes,
        config=data.config,
        status=Crawl.StatusChoices.QUEUED,
        retry_at=timezone.now(),
        created_by=request.user,
    )
    crawl.create_snapshots_from_urls()
    return crawl

@router.get("/crawl/{crawl_id}", response=CrawlSchema | str, url_name="get_crawl")
def get_crawl(request, crawl_id: str, as_rss: bool=False, with_snapshots: bool=False, with_archiveresults: bool=False):
    """Get a specific Crawl by id."""
    request.with_snapshots = with_snapshots
    request.with_archiveresults = with_archiveresults
    crawl = Crawl.objects.get(id__icontains=crawl_id)
    
    if crawl and as_rss:
        # return snapshots as XML rss feed
        urls = [
            {'url': snapshot.url, 'title': snapshot.title, 'bookmarked_at': snapshot.bookmarked_at, 'tags': snapshot.tags_str}
            for snapshot in crawl.snapshot_set.all()
        ]
        xml = '<rss version="2.0"><channel>'
        for url in urls:
            xml += f'<item><url>{url["url"]}</url><title>{url["title"]}</title><bookmarked_at>{url["bookmarked_at"]}</bookmarked_at><tags>{url["tags"]}</tags></item>'
        xml += '</channel></rss>'
        return xml
    
    return crawl


@router.patch("/crawl/{crawl_id}", response=CrawlSchema, url_name="patch_crawl")
def patch_crawl(request, crawl_id: str, data: CrawlUpdateSchema):
    """Update a crawl (e.g., set status=sealed to cancel queued work)."""
    crawl = Crawl.objects.get(id__icontains=crawl_id)
    payload = data.dict(exclude_unset=True)
    update_fields = ['modified_at']

    tags = payload.pop('tags', None)
    tags_str = payload.pop('tags_str', None)
    if tags is not None or tags_str is not None:
        crawl.tags_str = ','.join(normalize_tag_list(tags, tags_str or ''))
        update_fields.append('tags_str')

    if 'status' in payload:
        if payload['status'] not in Crawl.StatusChoices.values:
            raise HttpError(400, f'Invalid status: {payload["status"]}')
        crawl.status = payload['status']
        if crawl.status == Crawl.StatusChoices.SEALED and 'retry_at' not in payload:
            crawl.retry_at = None
        update_fields.append('status')

    if 'retry_at' in payload:
        crawl.retry_at = payload['retry_at']
        update_fields.append('retry_at')

    crawl.save(update_fields=update_fields)

    if payload.get('status') == Crawl.StatusChoices.SEALED:
        Snapshot.objects.filter(
            crawl=crawl,
            status__in=[Snapshot.StatusChoices.QUEUED, Snapshot.StatusChoices.STARTED],
        ).update(
            status=Snapshot.StatusChoices.SEALED,
            retry_at=None,
            modified_at=timezone.now(),
        )
    return crawl


@router.delete("/crawl/{crawl_id}", response=CrawlDeleteResponseSchema, url_name="delete_crawl")
def delete_crawl(request, crawl_id: str):
    crawl = Crawl.objects.get(id__icontains=crawl_id)
    crawl_id_str = str(crawl.id)
    snapshot_count = crawl.snapshot_set.count()
    deleted_count, _ = crawl.delete()
    return {
        'success': True,
        'crawl_id': crawl_id_str,
        'deleted_count': deleted_count,
        'deleted_snapshots': snapshot_count,
    }