__package__ = 'archivebox.api'

import math
from uuid import UUID
from typing import List, Optional, Union, Any
from datetime import datetime

from django.db.models import Q
from django.core.exceptions import ValidationError
from django.contrib.auth import get_user_model
from django.shortcuts import redirect

from ninja import Router, Schema, FilterSchema, Field, Query
from ninja.pagination import paginate, PaginationBase
from ninja.errors import HttpError

from core.models import Snapshot, ArchiveResult, Tag
from api.v1_crawls import CrawlSchema


router = Router(tags=['Core Models'])


class CustomPagination(PaginationBase):
    class Input(Schema):
        limit: int = 200
        offset: int = 0
        page: int = 0

    class Output(Schema):
        total_items: int
        total_pages: int
        page: int
        limit: int
        offset: int
        num_items: int
        items: List[Any]

    def paginate_queryset(self, queryset, pagination: Input, **params):
        limit = min(pagination.limit, 500)
        offset = pagination.offset or (pagination.page * limit)
        total = queryset.count()
        total_pages = math.ceil(total / limit)
        current_page = math.ceil(offset / (limit + 1))
        items = queryset[offset : offset + limit]
        return {
            'total_items': total,
            'total_pages': total_pages,
            'page': current_page,
            'limit': limit,
            'offset': offset,
            'num_items': len(items),
            'items': items,
        }


### ArchiveResult #########################################################################

class MinimalArchiveResultSchema(Schema):
    TYPE: str = 'core.models.ArchiveResult'
    id: UUID
    created_at: datetime | None
    modified_at: datetime | None
    created_by_id: str
    created_by_username: str
    status: str
    retry_at: datetime | None
    extractor: str
    cmd_version: str | None
    cmd: list[str] | None
    pwd: str | None
    output: str | None
    start_ts: datetime | None
    end_ts: datetime | None

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

    @staticmethod
    def resolve_created_by_username(obj) -> str:
        User = get_user_model()
        return User.objects.filter(pk=obj.created_by_id).values_list('username', flat=True)[0]


class ArchiveResultSchema(MinimalArchiveResultSchema):
    TYPE: str = 'core.models.ArchiveResult'
    snapshot_id: UUID
    snapshot_timestamp: str
    snapshot_url: str
    snapshot_tags: List[str]

    @staticmethod
    def resolve_snapshot_timestamp(obj):
        return obj.snapshot.timestamp

    @staticmethod
    def resolve_snapshot_url(obj):
        return obj.snapshot.url

    @staticmethod
    def resolve_snapshot_id(obj):
        return obj.snapshot_id

    @staticmethod
    def resolve_snapshot_tags(obj):
        return sorted(tag.name for tag in obj.snapshot.tags.all())


class ArchiveResultFilterSchema(FilterSchema):
    id: Optional[str] = Field(None, q=['id__startswith', 'snapshot__id__startswith', 'snapshot__timestamp__startswith'])
    search: Optional[str] = Field(None, q=['snapshot__url__icontains', 'snapshot__title__icontains', 'snapshot__tags__name__icontains', 'extractor', 'output__icontains', 'id__startswith', 'snapshot__id__startswith', 'snapshot__timestamp__startswith'])
    snapshot_id: Optional[str] = Field(None, q=['snapshot__id__startswith', 'snapshot__timestamp__startswith'])
    snapshot_url: Optional[str] = Field(None, q='snapshot__url__icontains')
    snapshot_tag: Optional[str] = Field(None, q='snapshot__tags__name__icontains')
    status: Optional[str] = Field(None, q='status')
    output: Optional[str] = Field(None, q='output__icontains')
    extractor: Optional[str] = Field(None, q='extractor__icontains')
    cmd: Optional[str] = Field(None, q='cmd__0__icontains')
    pwd: Optional[str] = Field(None, q='pwd__icontains')
    cmd_version: Optional[str] = Field(None, q='cmd_version')
    created_at: Optional[datetime] = Field(None, q='created_at')
    created_at__gte: Optional[datetime] = Field(None, q='created_at__gte')
    created_at__lt: Optional[datetime] = Field(None, q='created_at__lt')


@router.get("/archiveresults", response=List[ArchiveResultSchema], url_name="get_archiveresult")
@paginate(CustomPagination)
def get_archiveresults(request, filters: ArchiveResultFilterSchema = Query(...)):
    """List all ArchiveResult entries matching these filters."""
    return filters.filter(ArchiveResult.objects.all()).distinct()


@router.get("/archiveresult/{archiveresult_id}", response=ArchiveResultSchema, url_name="get_archiveresult")
def get_archiveresult(request, archiveresult_id: str):
    """Get a specific ArchiveResult by id."""
    return ArchiveResult.objects.get(Q(id__icontains=archiveresult_id))


### Snapshot #########################################################################

class SnapshotSchema(Schema):
    TYPE: str = 'core.models.Snapshot'
    id: UUID
    created_by_id: str
    created_by_username: str
    created_at: datetime
    modified_at: datetime
    status: str
    retry_at: datetime | None
    bookmarked_at: datetime
    downloaded_at: Optional[datetime]
    url: str
    tags: List[str]
    title: Optional[str]
    timestamp: str
    archive_path: str
    num_archiveresults: int
    archiveresults: List[MinimalArchiveResultSchema]

    @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_tags(obj):
        return sorted(tag.name for tag in obj.tags.all())

    @staticmethod
    def resolve_num_archiveresults(obj, context):
        return obj.archiveresult_set.all().distinct().count()

    @staticmethod
    def resolve_archiveresults(obj, context):
        if context['request'].with_archiveresults:
            return obj.archiveresult_set.all().distinct()
        return ArchiveResult.objects.none()


class SnapshotFilterSchema(FilterSchema):
    id: Optional[str] = Field(None, q=['id__icontains', 'timestamp__startswith'])
    created_by_id: str = Field(None, q='created_by_id')
    created_by_username: str = Field(None, q='created_by__username__icontains')
    created_at__gte: datetime = Field(None, q='created_at__gte')
    created_at__lt: datetime = Field(None, q='created_at__lt')
    created_at: datetime = Field(None, q='created_at')
    modified_at: datetime = Field(None, q='modified_at')
    modified_at__gte: datetime = Field(None, q='modified_at__gte')
    modified_at__lt: datetime = Field(None, q='modified_at__lt')
    search: Optional[str] = Field(None, q=['url__icontains', 'title__icontains', 'tags__name__icontains', 'id__icontains', 'timestamp__startswith'])
    url: Optional[str] = Field(None, q='url')
    tag: Optional[str] = Field(None, q='tags__name')
    title: Optional[str] = Field(None, q='title__icontains')
    timestamp: Optional[str] = Field(None, q='timestamp__startswith')
    bookmarked_at__gte: Optional[datetime] = Field(None, q='bookmarked_at__gte')
    bookmarked_at__lt: Optional[datetime] = Field(None, q='bookmarked_at__lt')


@router.get("/snapshots", response=List[SnapshotSchema], url_name="get_snapshots")
@paginate(CustomPagination)
def get_snapshots(request, filters: SnapshotFilterSchema = Query(...), with_archiveresults: bool = False):
    """List all Snapshot entries matching these filters."""
    request.with_archiveresults = with_archiveresults
    return filters.filter(Snapshot.objects.all()).distinct()


@router.get("/snapshot/{snapshot_id}", response=SnapshotSchema, url_name="get_snapshot")
def get_snapshot(request, snapshot_id: str, with_archiveresults: bool = True):
    """Get a specific Snapshot by id."""
    request.with_archiveresults = with_archiveresults
    try:
        return Snapshot.objects.get(Q(id__startswith=snapshot_id) | Q(timestamp__startswith=snapshot_id))
    except Snapshot.DoesNotExist:
        return Snapshot.objects.get(Q(id__icontains=snapshot_id))


### Tag #########################################################################

class TagSchema(Schema):
    TYPE: str = 'core.models.Tag'
    id: UUID
    modified_at: datetime
    created_at: datetime
    created_by_id: str
    created_by_username: str
    name: str
    slug: str
    num_snapshots: int
    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_num_snapshots(obj, context):
        return obj.snapshot_set.all().distinct().count()

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


@router.get("/tags", response=List[TagSchema], url_name="get_tags")
@paginate(CustomPagination)
def get_tags(request):
    request.with_snapshots = False
    request.with_archiveresults = False
    return Tag.objects.all().distinct()


@router.get("/tag/{tag_id}", response=TagSchema, url_name="get_tag")
def get_tag(request, tag_id: str, with_snapshots: bool = True):
    request.with_snapshots = with_snapshots
    request.with_archiveresults = False
    try:
        return Tag.objects.get(id__icontains=tag_id)
    except (Tag.DoesNotExist, ValidationError):
        return Tag.objects.get(slug__icontains=tag_id)


@router.get("/any/{id}", response=Union[SnapshotSchema, ArchiveResultSchema, TagSchema, CrawlSchema], url_name="get_any", summary="Get any object by its ID")
def get_any(request, id: str):
    """Get any object by its ID (e.g. snapshot, archiveresult, tag, crawl, etc.)."""
    request.with_snapshots = False
    request.with_archiveresults = False

    for getter in [get_snapshot, get_archiveresult, get_tag]:
        try:
            response = getter(request, id)
            if response:
                return redirect(f"/api/v1/{response._meta.app_label}/{response._meta.model_name}/{response.id}?{request.META['QUERY_STRING']}")
        except Exception:
            pass

    try:
        from api.v1_crawls import get_crawl
        response = get_crawl(request, id)
        if response:
            return redirect(f"/api/v1/{response._meta.app_label}/{response._meta.model_name}/{response.id}?{request.META['QUERY_STRING']}")
    except Exception:
        pass

    raise HttpError(404, 'Object with given ID not found')
