from datetime import datetime
from fastapi import APIRouter, Depends, Query
from sqlalchemy.ext.asyncio import AsyncSession

from backend.database import get_db
from backend.services import analytics_service

router = APIRouter(prefix="/analytics", tags=["analytics"])


@router.get("/engagement")
async def engagement(
    subreddit_id: int | None = None,
    granularity: str = Query("day", pattern="^(hour|day|week)$"),
    since: datetime | None = None,
    until: datetime | None = None,
    db: AsyncSession = Depends(get_db),
):
    return await analytics_service.get_engagement(db, subreddit_id, granularity, since, until)


@router.get("/top-posts")
async def top_posts(
    subreddit_id: int | None = None,
    metric: str = Query("score", pattern="^(score|num_comments)$"),
    since: datetime | None = None,
    until: datetime | None = None,
    limit: int = Query(10, ge=1, le=50),
    db: AsyncSession = Depends(get_db),
):
    return await analytics_service.get_top_posts(db, subreddit_id, metric, since, until, limit)


@router.get("/top-authors")
async def top_authors(
    subreddit_id: int | None = None,
    since: datetime | None = None,
    until: datetime | None = None,
    limit: int = Query(10, ge=1, le=50),
    db: AsyncSession = Depends(get_db),
):
    return await analytics_service.get_top_authors(db, subreddit_id, since, until, limit)


@router.get("/subreddit-summary")
async def subreddit_summary(
    since: datetime | None = None,
    until: datetime | None = None,
    db: AsyncSession = Depends(get_db),
):
    return await analytics_service.get_subreddit_summary(db, since, until)


@router.get("/flair-distribution")
async def flair_distribution(
    subreddit_id: int = Query(...),
    since: datetime | None = None,
    until: datetime | None = None,
    db: AsyncSession = Depends(get_db),
):
    return await analytics_service.get_flair_distribution(db, subreddit_id, since, until)