import json
import logging
import os
import threading
import time
import uuid
from collections import deque
from typing import Any, Dict, List, Optional

from flask import Flask, jsonify, request, send_from_directory

from inverters import INVERTERS
from modbus_client import ModbusReader
from mqtt_publisher import MqttPublisher

logging.basicConfig(
    level=logging.INFO,
    format="%(asctime)s %(levelname)s %(name)s: %(message)s",
)
log = logging.getLogger(__name__)

CONFIG_PATH = "/data/config.json"
HA_OPTIONS_PATH = "/data/options.json"
WEB_DIR = os.path.join(os.path.dirname(__file__), "web")

app = Flask(__name__, static_folder=WEB_DIR)

# ── State ────────────────────────────────────────────────────

class State:
    lock = threading.Lock()
    mqtt_cfg: Dict[str, Any] = {}
    inverters_cfg: List[Dict[str, Any]] = []
    # {inv_id: {values, last_update, modbus_ok, poll_count}}
    inv_data: Dict[str, Dict[str, Any]] = {}

_publisher: Optional[MqttPublisher] = None
_threads: Dict[str, threading.Thread] = {}
_stop_events: Dict[str, threading.Event] = {}

# ── Config ───────────────────────────────────────────────────

def _defaults() -> Dict[str, Any]:
    return {
        "mqtt_broker": "core-mosquitto",
        "mqtt_port": 1883,
        "mqtt_user": "",
        "mqtt_pass": "",
        "inverters": [],
    }

def load_config() -> Dict[str, Any]:
    cfg = _defaults()
    if os.path.exists(HA_OPTIONS_PATH):
        try:
            with open(HA_OPTIONS_PATH) as f:
                ha = json.load(f)
                for k in ("mqtt_broker", "mqtt_port", "mqtt_user", "mqtt_pass"):
                    if k in ha:
                        cfg[k] = ha[k]
        except Exception as e:
            log.warning("HA options Fehler: %s", e)
    if os.path.exists(CONFIG_PATH):
        try:
            with open(CONFIG_PATH) as f:
                cfg.update(json.load(f))
        except Exception as e:
            log.warning("Config-Datei Fehler: %s", e)
    return cfg

def save_config():
    data = {
        "mqtt_broker": State.mqtt_cfg.get("mqtt_broker", ""),
        "mqtt_port": State.mqtt_cfg.get("mqtt_port", 1883),
        "mqtt_user": State.mqtt_cfg.get("mqtt_user", ""),
        "mqtt_pass": State.mqtt_cfg.get("mqtt_pass", ""),
        "inverters": State.inverters_cfg,
    }
    with open(CONFIG_PATH, "w") as f:
        json.dump(data, f, indent=2)

# ── Poll Loop ─────────────────────────────────────────────────

def _poll_loop(inv_cfg: Dict[str, Any], stop: threading.Event):
    inv_id = inv_cfg["id"]
    model_id = inv_cfg.get("inverter_model", "MIC_1500_TL_X")
    inverter = INVERTERS.get(model_id, INVERTERS["MIC_1500_TL_X"])
    prefix = inv_cfg.get("mqtt_topic_prefix", f"growatt/{inv_id}")
    device_id = f"growatt_{inv_id}"
    interval = max(5, int(inv_cfg.get("update_interval", 30)))

    reader = ModbusReader(
        host=inv_cfg["modbus_ip"],
        port=int(inv_cfg.get("modbus_port", 502)),
        slave=int(inv_cfg.get("modbus_address", 1)),
    )

    with State.lock:
        if _publisher:
            _publisher.register_inverter(inverter, device_id, prefix,
                                         inv_cfg.get("name", inverter.name))

    log.info("[%s] Poll-Loop: %s @ %s:%s alle %ds",
             inv_id, inverter.name, inv_cfg["modbus_ip"],
             inv_cfg.get("modbus_port", 502), interval)

    while not stop.is_set():
        t0 = time.time()
        values = reader.read(inverter)
        with State.lock:
            d = State.inv_data.setdefault(inv_id, {"poll_count": 0})
            if values is not None:
                d["values"] = values
                d["last_update"] = time.time()
                d["modbus_ok"] = True
                d["poll_count"] = d.get("poll_count", 0) + 1
                # History: (timestamp, value) pro Sensor, maximal 5 Minuten
                hist = d.setdefault("history", {})
                now = time.time()
                for sid, val in values.items():
                    q = hist.setdefault(sid, deque(maxlen=300))
                    q.append((now, val))
                if _publisher:
                    _publisher.publish_data(values, prefix)
                    _publisher.publish_status("online", prefix)
            else:
                d["modbus_ok"] = False
                if _publisher:
                    _publisher.publish_status("offline", prefix)

        stop.wait(max(0.0, interval - (time.time() - t0)))

    reader.close()
    if _publisher:
        _publisher.publish_status("offline", prefix)
    log.info("[%s] Poll-Loop beendet", inv_id)

def _start_inverter(inv_cfg: Dict[str, Any]):
    inv_id = inv_cfg["id"]
    _stop_inverter(inv_id)
    ev = threading.Event()
    _stop_events[inv_id] = ev
    t = threading.Thread(target=_poll_loop, args=(inv_cfg, ev), daemon=True, name=f"poll-{inv_id}")
    _threads[inv_id] = t
    t.start()

def _stop_inverter(inv_id: str):
    if inv_id in _stop_events:
        _stop_events[inv_id].set()
    if inv_id in _threads:
        _threads[inv_id].join(timeout=15)
    _stop_events.pop(inv_id, None)
    _threads.pop(inv_id, None)

def _restart_all():
    global _publisher
    for inv_id in list(_threads.keys()):
        _stop_inverter(inv_id)
    if _publisher:
        _publisher.disconnect()

    _publisher = MqttPublisher(
        broker=State.mqtt_cfg.get("mqtt_broker", "core-mosquitto"),
        port=int(State.mqtt_cfg.get("mqtt_port", 1883)),
        user=State.mqtt_cfg.get("mqtt_user", ""),
        password=State.mqtt_cfg.get("mqtt_pass", ""),
    )
    _publisher.connect()
    time.sleep(2)

    for inv_cfg in State.inverters_cfg:
        _start_inverter(inv_cfg)

# ── REST API ──────────────────────────────────────────────────

@app.get("/api/config")
def api_get_config():
    with State.lock:
        cfg = {**State.mqtt_cfg, "inverters": State.inverters_cfg}
        cfg.pop("mqtt_pass", None)
        cfg["mqtt_connected"] = _publisher.connected if _publisher else False
    return jsonify(cfg)

@app.post("/api/config")
def api_save_config():
    data = request.get_json(force=True) or {}
    with State.lock:
        for k in ("mqtt_broker", "mqtt_port", "mqtt_user"):
            if k in data:
                State.mqtt_cfg[k] = data[k]
        if data.get("mqtt_pass"):
            State.mqtt_cfg["mqtt_pass"] = data["mqtt_pass"]
        save_config()
    threading.Thread(target=_restart_all, daemon=True).start()
    return jsonify({"ok": True})

@app.get("/api/inverters-config")
def api_get_inverters():
    with State.lock:
        return jsonify(State.inverters_cfg)

@app.post("/api/inverters-config")
def api_save_inverters():
    data = request.get_json(force=True) or []
    with State.lock:
        State.inverters_cfg = data
        save_config()
    threading.Thread(target=_restart_all, daemon=True).start()
    return jsonify({"ok": True})

@app.get("/api/data")
def api_get_data():
    with State.lock:
        result = {}
        for inv_cfg in State.inverters_cfg:
            inv_id = inv_cfg["id"]
            model_id = inv_cfg.get("inverter_model", "MIC_1500_TL_X")
            inverter = INVERTERS.get(model_id, INVERTERS["MIC_1500_TL_X"])
            d = State.inv_data.get(inv_id, {})
            cutoff = time.time() - 300  # letzte 5 Minuten
            raw_hist = d.get("history", {})
            history = {
                sid: [v for (t, v) in q if t >= cutoff]
                for sid, q in raw_hist.items()
            }
            result[inv_id] = {
                "name": inv_cfg.get("name", inverter.name),
                "inverter_name": inverter.name,
                "values": d.get("values", {}),
                "history": history,
                "sensors": [
                    {"id": s.id, "name": s.name, "unit": s.unit,
                     "icon": s.icon, "device_class": s.device_class}
                    for s in inverter.sensors
                ],
                "last_update": d.get("last_update"),
                "modbus_ok": d.get("modbus_ok", False),
                "poll_count": d.get("poll_count", 0),
            }
        mqtt_ok = _publisher.connected if _publisher else False
        return jsonify({"inverters": result, "mqtt_ok": mqtt_ok})

@app.get("/api/inverter-models")
def api_get_models():
    return jsonify({
        k: {"id": v.id, "name": v.name, "sensor_count": len(v.sensors)}
        for k, v in INVERTERS.items()
    })

@app.post("/api/new-id")
def api_new_id():
    return jsonify({"id": uuid.uuid4().hex[:8]})

@app.get("/")
def index():
    return send_from_directory(WEB_DIR, "index.html")

@app.get("/<path:filename>")
def static_files(filename):
    return send_from_directory(WEB_DIR, filename)

# ── Startup ───────────────────────────────────────────────────

if __name__ == "__main__":
    cfg = load_config()
    with State.lock:
        State.mqtt_cfg = {k: cfg[k] for k in
                          ("mqtt_broker", "mqtt_port", "mqtt_user", "mqtt_pass")}
        State.inverters_cfg = cfg.get("inverters", [])
        # Migration: single-inverter config → list
        if not State.inverters_cfg and cfg.get("modbus_ip"):
            State.inverters_cfg = [{
                "id": uuid.uuid4().hex[:8],
                "name": cfg.get("inverter_model", "MIC_1500_TL_X").replace("_", " "),
                "modbus_ip": cfg["modbus_ip"],
                "modbus_port": cfg.get("modbus_port", 502),
                "modbus_address": cfg.get("modbus_address", 1),
                "inverter_model": cfg.get("inverter_model", "MIC_1500_TL_X"),
                "mqtt_topic_prefix": cfg.get("mqtt_topic_prefix", "growatt/shinelanx"),
                "update_interval": cfg.get("update_interval", 30),
            }]
            save_config()

    _restart_all()
    port = int(os.environ.get("INGRESS_PORT", "8099"))
    log.info("Web UI startet auf Port %d", port)
    app.run(host="0.0.0.0", port=port, threaded=True)