import asyncio
import csv
import io
import json
from datetime import datetime, timezone

import aiosqlite
from fastapi import APIRouter, Depends, HTTPException, Query, Request
from fastapi.responses import HTMLResponse, StreamingResponse
from sse_starlette.sse import EventSourceResponse

from app import poller
from app.config import settings
from app.database import get_db
from app.models import (
    BurninJobResponse, BurninStageResponse,
    CancelBurninRequest, DriveResponse,
    SmartTestState, StartBurninRequest, UnlockPoolDriveRequest,
    UpdateDriveRequest,
)
from app.renderer import templates

# Helpers shared with the extracted sub-routers — keep the underscore-
# prefixed local names that existing in-file callers reach for.
from ._helpers import (
    client_ip as _client_ip,
    is_stale as _is_stale,
    operator_for as _operator_for,
    secret_status as _secret_status,
    stale_context as _stale_context,
    SECRET_FIELDS as _SECRET_FIELDS,
)

router = APIRouter()

# Sub-routers extracted as part of the routes/ package split (1.0.0-34).
# Their endpoints get registered against the same APIRouter, so the
# external `from app.routes import router` import in app/main.py keeps
# working unchanged. Future slices can extract more — drives, burnin,
# settings, history — using the same pattern.
#
# Absolute imports (`import app.routes.X as _Y`) instead of relative
# (`from . import X as _Y`) so we stay safe even if a future top-level
# `from app import X` is reintroduced here — `from app import auth`
# would bind `auth` on the `app.routes` package namespace and shadow
# any relative-submodule lookup. Absolute imports always resolve to
# `app.routes.X` regardless of what's already bound on the package.
import app.routes.auth as _auth_routes        # noqa: E402
import app.routes.system as _system_routes    # noqa: E402
import app.routes.history as _history_routes  # noqa: E402
import app.routes.audit as _audit_routes      # noqa: E402
import app.routes.stats as _stats_routes      # noqa: E402
import app.routes.report as _report_routes    # noqa: E402
import app.routes.settings as _settings_routes  # noqa: E402
import app.routes.drives as _drives_routes    # noqa: E402
import app.routes.burnin as _burnin_routes    # noqa: E402

router.include_router(_auth_routes.router)
router.include_router(_system_routes.router)
router.include_router(_history_routes.router)
router.include_router(_audit_routes.router)
router.include_router(_stats_routes.router)
router.include_router(_report_routes.router)
router.include_router(_settings_routes.router)
router.include_router(_drives_routes.router)
router.include_router(_burnin_routes.router)

# Drives helpers — re-exported for the dashboard + SSE handlers in this
# file AND for `from app.routes import _fetch_drives_for_template`
# from mailer.py (existing back-compat shim).
from ._drives_helpers import (                 # noqa: E402
    _DRIVES_QUERY, _row_to_drive, _build_smart, _compute_status,
    _compute_eta_seconds, _eta_seconds,
    _fetch_burnin_by_drive, _fetch_drives_for_template,
)


# _stale_context is now imported from ._helpers above.




# ---------------------------------------------------------------------------
# Dashboard
# ---------------------------------------------------------------------------

@router.get("/", response_class=HTMLResponse)
async def dashboard(request: Request, db: aiosqlite.Connection = Depends(get_db)):
    drives = await _fetch_drives_for_template(db)
    ps = poller.get_state()
    return templates.TemplateResponse(request, "dashboard.html", {
        "request": request,
        "drives": drives,
        "poller": ps,
        **_stale_context(ps),
    })


# ---------------------------------------------------------------------------
# SSE — live drive table updates
# ---------------------------------------------------------------------------

@router.get("/sse/drives")
async def sse_drives(request: Request):
    q = poller.subscribe()

    async def generate():
        try:
            while True:
                # Wait for next poll notification or keepalive timeout
                try:
                    payload = await asyncio.wait_for(q.get(), timeout=25.0)
                except asyncio.TimeoutError:
                    if await request.is_disconnected():
                        break
                    yield {"event": "keepalive", "data": ""}
                    continue

                if await request.is_disconnected():
                    break

                # Extract alert from payload (may be None for regular polls)
                alert = None
                if isinstance(payload, dict):
                    alert = payload.get("alert")

                # Render fresh table HTML
                async with aiosqlite.connect(settings.db_path) as db:
                    db.row_factory = aiosqlite.Row
                    await db.execute("PRAGMA journal_mode=WAL")
                    drives = await _fetch_drives_for_template(db)

                html = templates.env.get_template(
                    "components/drives_table.html"
                ).render(drives=drives)

                yield {"event": "drives-update", "data": html}

                # Push system sensor state so JS can update temp chips live
                ps = poller.get_state()
                yield {
                    "event": "system-sensors",
                    "data": json.dumps({
                        "system_temps":    ps.get("system_temps", {}),
                        "thermal_pressure": ps.get("thermal_pressure", "ok"),
                        "temp_warn_c":     settings.temp_warn_c,
                        "temp_crit_c":     settings.temp_crit_c,
                    }),
                }

                # Push browser notification event if this was a job completion
                if alert:
                    yield {"event": "job-alert", "data": json.dumps(alert)}

        finally:
            poller.unsubscribe(q)

    return EventSourceResponse(generate())


# ---------------------------------------------------------------------------
# JSON API
# ---------------------------------------------------------------------------