from typing import List

from ninja import Field, Schema
from ninja.pagination import paginate

from catalog.common.models import Item, ItemSchema
from common.api import PageNumberPagination, Result, api

from ..models import Tag


class TagSchema(Schema):
    uuid: str
    title: str
    visibility: int = Field(ge=0, le=2)


class TagInSchema(Schema):
    title: str
    visibility: int = Field(ge=0, le=2)


class TagItemSchema(Schema):
    item: ItemSchema


class TagItemInSchema(Schema):
    item_uuid: str


@api.get(
    "/me/tag/",
    response={200: List[TagSchema], 401: Result, 403: Result},
    tags=["tag"],
)
@paginate(PageNumberPagination)
def list_tags(request, title: str | None = None):
    """
    Get tags created by current user

    `title` is optional, all tags will be returned if not specified.
    """
    queryset = Tag.objects.filter(owner=request.user.identity)
    if title:
        queryset = queryset.filter(title=Tag.cleanup_title(title))
    return queryset


@api.get(
    "/me/tag/{tag_uuid}",
    response={200: TagSchema, 401: Result, 403: Result, 404: Result},
    tags=["tag"],
)
def get_tag(request, tag_uuid: str):
    """
    Get tags by its uuid
    """
    tag = Tag.get_by_url(tag_uuid)
    if not tag:
        return 404, {"message": "Tag not found"}
    if tag.owner != request.user.identity:
        return 403, {"message": "Not owner"}
    return tag


@api.post(
    "/me/tag/",
    response={200: TagSchema, 401: Result, 403: Result, 404: Result},
    tags=["tag"],
)
def create_tag(request, t_in: TagInSchema):
    """
    Create tag.

    `title` is required, `visibility` can only be 0 or 2; if tag with same title exists, existing tag will be returned.
    """
    title = Tag.cleanup_title(t_in.title)
    visibility = 2 if t_in.visibility else 0
    tag, created = Tag.objects.get_or_create(
        owner=request.user.identity,
        title=title,
        defaults={"visibility": visibility},
    )
    if not created:
        tag.visibility = visibility
        tag.save()
    return tag


@api.put(
    "/me/tag/{tag_uuid}",
    response={200: TagSchema, 401: Result, 403: Result, 404: Result, 409: Result},
    tags=["tag"],
)
def update_tag(request, tag_uuid: str, t_in: TagInSchema):
    """
    Update tag.

    rename tag with an existing title will return HTTP 409 error
    """
    tag = Tag.get_by_url(tag_uuid)
    if not tag:
        return 404, {"message": "Tag not found"}
    if tag.owner != request.user.identity:
        return 403, {"message": "Not owner"}
    title = Tag.cleanup_title(tag.title)
    visibility = 2 if t_in.visibility else 0
    if title != tag.title:
        try:
            tag.title = title
            tag.visibility = visibility
            tag.save()
        except Exception:
            return 409, {"message": "Tag with same title exists"}
    return tag


@api.delete(
    "/me/tag/{tag_uuid}",
    response={200: Result, 401: Result, 403: Result, 404: Result},
    tags=["tag"],
)
def delete_tag(request, tag_uuid: str):
    """
    Remove a tag.
    """
    tag = Tag.get_by_url(tag_uuid)
    if not tag:
        return 404, {"message": "Tag not found"}
    if tag.owner != request.user.identity:
        return 403, {"message": "Not owner"}
    tag.delete()
    return 200, {"message": "OK"}


@api.get(
    "/me/tag/{tag_uuid}/item/",
    response={200: List[TagItemSchema], 401: Result, 403: Result, 404: Result},
    tags=["tag"],
)
@paginate(PageNumberPagination)
def tag_list_items(request, tag_uuid: str):
    """
    Get items in a tag tags
    """
    tag = Tag.get_by_url(tag_uuid)
    if not tag:
        return 404, {"message": "Tag not found"}
    if tag.owner != request.user.identity:
        return 403, {"message": "Not owner"}
    return tag.members.all()


@api.post(
    "/me/tag/{tag_uuid}/item/",
    response={200: Result, 401: Result, 403: Result, 404: Result},
    tags=["tag"],
)
def tag_add_item(request, tag_uuid: str, tag_item: TagItemInSchema):
    """
    Add an item to tag
    """
    tag = Tag.get_by_url(tag_uuid)
    if not tag:
        return 404, {"message": "Tag not found"}
    if tag.owner != request.user.identity:
        return 403, {"message": "Not owner"}
    if not tag_item.item_uuid:
        return 404, {"message": "Item not found"}
    item = Item.get_by_url(tag_item.item_uuid)
    if not item:
        return 404, {"message": "Item not found"}
    tag.append_item(item)
    return 200, {"message": "OK"}


@api.delete(
    "/me/tag/{tag_uuid}/item/{item_uuid}",
    response={200: Result, 401: Result, 403: Result, 404: Result},
    tags=["tag"],
)
def tag_delete_item(request, tag_uuid: str, item_uuid: str):
    """
    Remove an item from tag
    """
    tag = Tag.get_by_url(tag_uuid)
    if not tag:
        return 404, {"message": "Tag not found"}
    if tag.owner != request.user.identity:
        return 403, {"message": "Not owner"}
    item = Item.get_by_url(item_uuid)
    if not item:
        return 404, {"message": "Item not found"}
    tag.remove_item(item)
    return 200, {"message": "OK"}