import datetime

from django.conf import settings
from django.core.cache import cache
from django.utils import timezone
from hatchway import api_view

from activities.models import Post
from api import schemas
from core.models import Config
from takahe import __version__
from users.models import Domain, Identity


@api_view.get
def instance_info_v1(request):
    # The stats are expensive to calculate, so don't do it very often
    stats = cache.get("instance_info_stats")
    if stats is None:
        stats = {
            "user_count": Identity.objects.filter(local=True).count(),
            "status_count": Post.objects.filter(local=True).not_hidden().count(),
            "domain_count": Domain.objects.count(),
        }
        cache.set("instance_info_stats", stats, timeout=300)
    return {
        "uri": request.headers.get("host", settings.SETUP.MAIN_DOMAIN),
        "title": Config.system.site_name,
        "short_description": "",
        "description": "",
        "email": "",
        "version": f"takahe/{__version__}",
        "urls": {},
        "stats": stats,
        "thumbnail": Config.system.site_banner,
        "languages": ["en"],
        "registrations": (Config.system.signup_allowed),
        "approval_required": False,
        "invites_enabled": False,
        "configuration": {
            "accounts": {},
            "statuses": {
                "max_characters": Config.system.post_length,
                "max_media_attachments": 4,
                "characters_reserved_per_url": 23,
            },
            "media_attachments": {
                "supported_mime_types": [
                    "image/apng",
                    "image/avif",
                    "image/gif",
                    "image/jpeg",
                    "image/png",
                    "image/webp",
                ],
                "image_size_limit": (1024**2) * 10,
                "image_matrix_limit": 2000 * 2000,
            },
            "polls": {
                "max_options": 4,
                "max_characters_per_option": 50,
                "min_expiration": 300,
                "max_expiration": 2629746,
            },
        },
        "contact_account": None,
        "rules": [],
    }


@api_view.get
def instance_info_v2(request) -> dict:
    current_domain = Domain.get_domain(
        request.headers.get("host", settings.SETUP.MAIN_DOMAIN)
    )
    if current_domain is None or not current_domain.local:
        current_domain = Domain.get_domain(settings.SETUP.MAIN_DOMAIN)
    if current_domain is None:
        raise ValueError("No domain set up for MAIN_DOMAIN")
    admin_identity = (
        Identity.objects.filter(users__admin=True).order_by("created").first()
    )
    return {
        "domain": current_domain.domain,
        "title": Config.system.site_name,
        "version": f"takahe/{__version__}",
        "source_url": "https://github.com/jointakahe/takahe",
        "description": "",
        "email": "",
        "urls": {},
        "usage": {
            "users": {
                "active_month": Identity.objects.filter(local=True).count(),
            }
        },
        "thumbnail": {
            "url": Config.system.site_banner,
        },
        "languages": ["en"],
        "configuration": {
            "urls": {},
            "accounts": {"max_featured_tags": 0},
            "statuses": {
                "max_characters": Config.system.post_length,
                "max_media_attachments": 4,
                "characters_reserved_per_url": 23,
            },
            "media_attachments": {
                "supported_mime_types": [
                    "image/apng",
                    "image/avif",
                    "image/gif",
                    "image/jpeg",
                    "image/png",
                    "image/webp",
                ],
                "image_size_limit": (1024**2) * 10,
                "image_matrix_limit": 2000 * 2000,
                "video_size_limit": 0,
                "video_frame_rate_limit": 60,
                "video_matrix_limit": 2000 * 2000,
            },
            "polls": {
                "max_options": 4,
                "max_characters_per_option": 50,
                "min_expiration": 300,
                "max_expiration": 2629746,
            },
            "translation": {"enabled": False},
        },
        "registrations": {
            "enabled": Config.system.signup_allowed,
            "approval_required": False,
            "message": None,
        },
        "contact": {
            "email": "",
            "account": schemas.Account.from_identity(admin_identity),
        },
        "rules": [],
    }


@api_view.get
def peers(request) -> list[str]:
    return list(
        Domain.objects.filter(local=False, blocked=False).values_list(
            "domain", flat=True
        )
    )


@api_view.get
def activity(request) -> list:
    """
    Weekly activity endpoint
    """
    # The stats are expensive to calculate, so don't do it very often
    stats = cache.get("instance_activity_stats")
    if stats is None:
        stats = []
        # Work out our most recent week start
        now = timezone.now()
        week_start = now.replace(
            hour=0, minute=0, second=0, microsecond=0
        ) - datetime.timedelta(now.weekday())
        for i in range(12):
            week_end = week_start + datetime.timedelta(days=7)
            stats.append(
                {
                    "week": int(week_start.timestamp()),
                    "statuses": Post.objects.filter(
                        local=True, created__gte=week_start, created__lt=week_end
                    ).count(),
                    # TODO: Populate when we have identity activity tracking
                    "logins": 0,
                    "registrations": Identity.objects.filter(
                        local=True, created__gte=week_start, created__lt=week_end
                    ).count(),
                }
            )
            week_start -= datetime.timedelta(days=7)
        cache.set("instance_activity_stats", stats, timeout=300)
    return stats