from typing import Annotated

from fastapi import APIRouter, Depends, HTTPException, Query, Response
from pydantic import BaseModel, ConfigDict, Field, field_validator

from ..auth import get_current_user
from ..clients.jellystat import HistoryLimitError, JellystatError
from ..services.insights import get_insights
from ..services.insights_artwork import get_artwork
from ..services.monthly_reports import get_monthly_report, report_csv
from ..runtime import get_runtime_settings

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


class MonthlyReportQuery(BaseModel):
    model_config = ConfigDict(extra="forbid")
    month: str | None = Field(default=None, max_length=7, pattern=r"^[0-9]{4}-[0-9]{2}$")


async def monthly_data(user: dict, month: str | None) -> dict:
    try:
        return await get_monthly_report(user, month)
    except ValueError as exc:
        raise HTTPException(422, "Choose the current month or one of the previous 23 months.") from exc
    except HistoryLimitError as exc:
        raise HTTPException(422, "This report exceeds Jellystat's history limit. No partial report has been generated.") from exc
    except JellystatError as exc:
        raise HTTPException(502, "Your monthly report is temporarily unavailable. Please try again shortly.") from exc


@router.get("/reports/monthly")
async def monthly_report(query: Annotated[MonthlyReportQuery, Query()], response: Response,
                         user: dict = Depends(get_current_user)) -> dict:
    response.headers["Cache-Control"] = "no-store"
    return await monthly_data(user, query.month)


@router.get("/reports/monthly.csv")
async def monthly_export(query: Annotated[MonthlyReportQuery, Query()], user: dict = Depends(get_current_user)):
    report = await monthly_data(user, query.month)
    if report["state"] != "ready":
        raise HTTPException(409, "Connect Jellystat and link your viewing account before downloading a report.")
    return Response(report_csv(report), media_type="text/csv; charset=utf-8", headers={
        "Cache-Control": "no-store", "X-Content-Type-Options": "nosniff",
        "Content-Disposition": f'attachment; filename="magent-monthly-report-{report["month"]}.csv"'})


@router.get("/artwork/{item_id}")
async def artwork(item_id: str, token: Annotated[str, Query(max_length=100)], user: dict = Depends(get_current_user)):
    content, media_type = await get_artwork(user, get_runtime_settings(), item_id, token)
    return Response(content=content, media_type=media_type,
                    headers={"Cache-Control": "private, max-age=600", "Vary": "Cookie, Authorization", "X-Content-Type-Options": "nosniff"})


class InsightsQuery(BaseModel):
    model_config = ConfigDict(extra="forbid")
    days: int = 30

    @field_validator("days")
    @classmethod
    def supported_period(cls, value: int) -> int:
        if value not in {7, 30, 90, 365}:
            raise ValueError("Choose 7, 30, 90 or 365 days")
        return value


@router.get("")
async def dashboard(query: Annotated[InsightsQuery, Query()], response: Response,
                    user: dict = Depends(get_current_user)) -> dict:
    response.headers["Cache-Control"] = "no-store"
    try:
        return await get_insights(user, query.days)
    except HistoryLimitError as exc:
        raise HTTPException(status_code=422, detail="There is too much history for this period. Choose a shorter period.") from exc
    except JellystatError as exc:
        raise HTTPException(status_code=502, detail="Your viewing stats are temporarily unavailable. Please try again shortly.") from exc