"""GET /sites/{site_id}/configuration – read-only souhrn konfigurace lokality."""

from __future__ import annotations

from datetime import datetime, timezone
from typing import Annotated, Any

import asyncpg
from fastapi import APIRouter, Depends, HTTPException
from pydantic import BaseModel, Field

from app.db_json import record_to_dict
from app.deps import get_pg_pool

router = APIRouter(prefix="/sites/{site_id}", tags=["sites"])


class InverterModbusCurrentCapsBody(BaseModel):
    """Tvrdý strop proudu pro zápis Deye reg 108/109 (A); NULL ve JSONu = smaž strop v DB."""

    deye_register_max_charge_a: int | None = Field(
        default=None, ge=0, le=640, description="None při vynechání klíče = nezměnit; explicitní null = smazat strop"
    )
    deye_register_max_discharge_a: int | None = Field(
        default=None, ge=0, le=640, description="Jako u nabíjení"
    )

_DEYE_KEYS = frozenset(
    {
        "deye_last_system_time_sync_at",
        "deye_last_system_time_sync_minute",
        "deye_last_tou_inactive_write_prague_date",
        "deye_tou_inactive_signature",
    }
)


def _mask_secret_reference(raw: str | None) -> str | None:
    if raw is None:
        return None
    s = str(raw).strip()
    if not s:
        return None
    if len(s) <= 4:
        return "nastaveno"
    return f"…{s[-2:]}"


def _iso_utc(dt: datetime | None) -> str | None:
    if dt is None:
        return None
    if dt.tzinfo is None:
        dt = dt.replace(tzinfo=timezone.utc)
    return dt.astimezone(timezone.utc).isoformat()


@router.get("/configuration")
async def get_site_configuration(
    site_id: int,
    pool: Annotated[asyncpg.Pool, Depends(get_pg_pool)],
) -> dict[str, Any]:
    async with pool.acquire() as conn:
        site_row = await conn.fetchrow(
            """
            SELECT id, code, name, timezone, latitude, longitude, active, notes, created_at
            FROM ems.site
            WHERE id = $1
            """,
            site_id,
        )
        if site_row is None:
            raise HTTPException(status_code=404, detail="Site not found")

        grid_row = await conn.fetchrow(
            "SELECT * FROM ems.site_grid_connection WHERE site_id = $1",
            site_id,
        )
        market_row = await conn.fetchrow(
            """
            SELECT *
            FROM ems.site_market_config
            WHERE site_id = $1
              AND valid_from <= now()
              AND (valid_to IS NULL OR valid_to > now())
            ORDER BY valid_from DESC
            LIMIT 1
            """,
            site_id,
        )
        endpoint_rows = await conn.fetch(
            """
            SELECT id, site_id, endpoint_type, host, port, protocol, unit_id,
                   auth_reference, enabled, notes
            FROM ems.site_endpoint
            WHERE site_id = $1
            ORDER BY id
            """,
            site_id,
        )
        endpoints: list[dict[str, Any]] = []
        for er in endpoint_rows:
            d = record_to_dict(er)
            d["auth_reference"] = _mask_secret_reference(er["auth_reference"])
            endpoints.append(d)

        inv_rows = await conn.fetch(
            """
            SELECT ai.*,
                   (SELECT ep.host || CASE
                        WHEN ep.port IS NOT NULL THEN ':' || ep.port::text
                        ELSE ''
                    END
                    FROM ems.site_endpoint ep
                    WHERE ep.id = ai.endpoint_id) AS endpoint_connection
            FROM ems.asset_inverter ai
            WHERE ai.site_id = $1
            ORDER BY ai.id
            """,
            site_id,
        )
        inverters: list[dict[str, Any]] = []
        for ir in inv_rows:
            full = record_to_dict(ir)
            ep_label = full.pop("endpoint_connection", None)
            core = {k: v for k, v in full.items() if k not in _DEYE_KEYS}
            deye_meta = {k: full[k] for k in _DEYE_KEYS if full.get(k) is not None}
            core["endpoint_connection"] = ep_label
            core["deye_meta"] = deye_meta if deye_meta else None
            inverters.append(core)

        bat_rows = await conn.fetch(
            "SELECT * FROM ems.asset_battery WHERE site_id = $1 ORDER BY id",
            site_id,
        )
        pv_rows = await conn.fetch(
            "SELECT * FROM ems.asset_pv_array WHERE site_id = $1 ORDER BY id",
            site_id,
        )
        ev_rows = await conn.fetch(
            """
            SELECT ec.*,
                   se.host || CASE
                       WHEN se.port IS NOT NULL THEN ':' || se.port::text
                       ELSE ''
                   END AS endpoint_connection
            FROM ems.asset_ev_charger ec
            LEFT JOIN ems.site_endpoint se ON se.id = ec.endpoint_id
            WHERE ec.site_id = $1
            ORDER BY ec.id
            """,
            site_id,
        )
        ev_chargers = [record_to_dict(r) for r in ev_rows]

        veh_rows = await conn.fetch(
            """
            SELECT id, site_id, code, name, make, model, battery_capacity_kwh,
                   max_charge_power_w, default_charger_id, api_type, api_reference,
                   default_target_soc_pct, default_deadline_hour, active
            FROM ems.asset_vehicle
            WHERE site_id = $1
            ORDER BY code
            """,
            site_id,
        )
        vehicles: list[dict[str, Any]] = []
        for vr in veh_rows:
            d = record_to_dict(vr)
            d["api_reference"] = _mask_secret_reference(vr["api_reference"])
            vehicles.append(d)

        hp_rows = await conn.fetch(
            """
            SELECT hp.*,
                   se.host || CASE
                       WHEN se.port IS NOT NULL THEN ':' || se.port::text
                       ELSE ''
                   END AS endpoint_connection
            FROM ems.asset_heat_pump hp
            LEFT JOIN ems.site_endpoint se ON se.id = hp.endpoint_id
            WHERE hp.site_id = $1
            ORDER BY hp.id
            """,
            site_id,
        )
        heat_pumps = [record_to_dict(r) for r in hp_rows]

        mode_row = await conn.fetchrow(
            """
            SELECT m.mode_code, m.activated_at, m.activated_by, m.valid_until,
                   m.previous_mode, m.notes,
                   d.name AS mode_name, d.description AS mode_description,
                   d.loxone_mode_value, d.ev_enabled, d.heat_pump_enabled,
                   d.battery_mode, d.grid_mode, d.is_autonomous
            FROM ems.site_operating_mode m
            JOIN ems.operating_mode_def d ON d.code = m.mode_code
            WHERE m.site_id = $1
            """,
            site_id,
        )

        override_rows = await conn.fetch(
            """
            SELECT id, override_type, value_json, valid_from, valid_to, reason, created_by, created_at
            FROM ems.site_override
            WHERE site_id = $1
              AND valid_from <= now()
              AND (valid_to IS NULL OR valid_to > now())
            ORDER BY valid_from DESC
            LIMIT 50
            """,
            site_id,
        )

        hb_row = await conn.fetchrow(
            "SELECT last_seen, status FROM ems.site_heartbeat WHERE site_id = $1",
            site_id,
        )
        run_row = await conn.fetchrow(
            """
            SELECT id, created_at
            FROM ems.planning_run
            WHERE site_id = $1 AND status = 'active'
            ORDER BY created_at DESC
            LIMIT 1
            """,
            site_id,
        )

    site = record_to_dict(site_row)
    lat = site_row["latitude"]
    lon = site_row["longitude"]
    site["latitude"] = float(lat) if lat is not None else None
    site["longitude"] = float(lon) if lon is not None else None

    operating_mode = record_to_dict(mode_row) if mode_row else None

    return {
        "site": site,
        "grid_connection": record_to_dict(grid_row) if grid_row else None,
        "market_config": record_to_dict(market_row) if market_row else None,
        "market_config_note": (
            "Zelený bonus za výrobu je u FVE polí (asset_pv_array), ne v obchodní konfiguraci."
        ),
        "endpoints": endpoints,
        "inverters": inverters,
        "batteries": [record_to_dict(r) for r in bat_rows],
        "pv_arrays": [record_to_dict(r) for r in pv_rows],
        "ev_chargers": ev_chargers,
        "vehicles": vehicles,
        "heat_pumps": heat_pumps,
        "operating_mode": operating_mode,
        "active_overrides": [record_to_dict(r) for r in override_rows],
        "operational": {
            "heartbeat_last_seen": _iso_utc(hb_row["last_seen"]) if hb_row else None,
            "heartbeat_status": hb_row["status"] if hb_row else None,
            "has_active_plan": run_row is not None,
            "active_plan_created_at": _iso_utc(run_row["created_at"]) if run_row else None,
        },
    }


@router.patch("/inverters/{inverter_id}/modbus-current-caps")
async def patch_inverter_modbus_current_caps(
    site_id: int,
    inverter_id: int,
    body: InverterModbusCurrentCapsBody,
    pool: Annotated[asyncpg.Pool, Depends(get_pg_pool)],
) -> dict[str, Any]:
    """
    Nastavení `deye_register_max_charge_a` / `deye_register_max_discharge_a` na `ems.asset_inverter`.
    Hodnoty se uplatní v dotazu `_load_inverter_config` jako `COALESCE(strop_A, FLOOR(…z_kW))` pro reg 108/109.
    """
    updates = body.model_dump(exclude_unset=True)
    if not updates:
        raise HTTPException(
            status_code=400,
            detail="Send at least one of: deye_register_max_charge_a, deye_register_max_discharge_a",
        )
    async with pool.acquire() as conn:
        owner = await conn.fetchval(
            """
            SELECT id FROM ems.asset_inverter
            WHERE id = $1 AND site_id = $2
            """,
            inverter_id,
            site_id,
        )
        if owner is None:
            raise HTTPException(status_code=404, detail="Inverter not found for this site")

        sets: list[str] = []
        args: list[Any] = []
        n = 1
        if "deye_register_max_charge_a" in updates:
            sets.append(f"deye_register_max_charge_a = ${n}")
            args.append(updates["deye_register_max_charge_a"])
            n += 1
        if "deye_register_max_discharge_a" in updates:
            sets.append(f"deye_register_max_discharge_a = ${n}")
            args.append(updates["deye_register_max_discharge_a"])
            n += 1

        args.extend([inverter_id, site_id])
        await conn.execute(
            f"""
            UPDATE ems.asset_inverter
            SET {", ".join(sets)}
            WHERE id = ${n} AND site_id = ${n + 1}
            """,
            *args,
        )
        row = await conn.fetchrow(
            """
            SELECT id, code, deye_register_max_charge_a, deye_register_max_discharge_a
            FROM ems.asset_inverter
            WHERE id = $1 AND site_id = $2
            """,
            inverter_id,
            site_id,
        )
    assert row is not None
    return {
        "inverter_id": int(row["id"]),
        "code": row["code"],
        "deye_register_max_charge_a": row["deye_register_max_charge_a"],
        "deye_register_max_discharge_a": row["deye_register_max_discharge_a"],
    }