#!/usr/bin/env python3
import os
import RPi.GPIO as GPIO
from fastapi import FastAPI, HTTPException
from fastapi.middleware.cors import CORSMiddleware
from fastapi.staticfiles import StaticFiles
from pydantic import BaseModel
import aiosqlite
from datetime import datetime, timedelta
import asyncio
from typing import List, Optional
import logging
import json
from mqtt_integration import HomeAssistantMQTT


# Configure logging
logging.basicConfig(
    level=logging.INFO,
    format='%(asctime)s - %(name)s - %(levelname)s - %(message)s'
)
logger = logging.getLogger(__name__)

# Initialize FastAPI
app = FastAPI()
ha_mqtt = HomeAssistantMQTT()

# Set up MQTT event logging
async def log_mqtt_event(action: str, success: bool = True):
    """Log MQTT events to the database"""
    async with aiosqlite.connect(DB_PATH) as db:
        await db.execute(
            "INSERT INTO events (timestamp, action, source, success) VALUES (?, ?, ?, ?)",
            (datetime.utcnow().isoformat(), action, "MQTT", success)
        )
        await db.commit()

ha_mqtt.set_event_callback(log_mqtt_event)

# CORS middleware
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],  # In production, replace with specific origins
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

# Constants
DB_PATH = "gate.db"
RELAY_1_PIN = int(os.getenv("RELAY_1_PIN", "22"))  # GPIO22 (Pin 15)
RELAY_2_PIN = int(os.getenv("RELAY_2_PIN", "5"))   # GPIO5 (Pin 29)
STATUS_PIN = int(os.getenv("STATUS_PIN", "4"))     # GPIO4 (Pin 7)
TRIGGER_DURATION = int(os.getenv("TRIGGER_DURATION", "500"))  # 500ms default
DEFAULT_MAX_OPEN_TIME = 300  # seconds (5 minutes)

# Models
class GateEvent(BaseModel):
    id: Optional[int] = None
    timestamp: str
    action: str
    source: str
    success: bool

class Settings(BaseModel):
    maxOpenTimeSeconds: str
    triggerDuration: str
    mqtt: dict

class GateStatus(BaseModel):
    isOpen: bool
    lastChanged: str

# GPIO Setup
def setup_gpio():
    GPIO.setwarnings(False)
    GPIO.setmode(GPIO.BCM)
    
    # Setup relays as outputs (LOW is off)
    GPIO.setup(RELAY_1_PIN, GPIO.OUT)
    GPIO.setup(RELAY_2_PIN, GPIO.OUT)
    GPIO.output(RELAY_1_PIN, GPIO.LOW)
    GPIO.output(RELAY_2_PIN, GPIO.LOW)
    
    # Setup status pin as input with pull-down
    # This means it will read LOW when floating
    GPIO.setup(STATUS_PIN, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)
    
    logger.info(f"GPIO initialized: Relay 1 on GPIO{RELAY_1_PIN}, Relay 2 on GPIO{RELAY_2_PIN}, Status on GPIO{STATUS_PIN}")

# Database functions
async def init_db():
    """Initialize the SQLite database"""
    async with aiosqlite.connect(DB_PATH) as db:
        # Create events table
        await db.execute("""
            CREATE TABLE IF NOT EXISTS events (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                timestamp TEXT NOT NULL,
                action TEXT NOT NULL,
                source TEXT NOT NULL,
                success BOOLEAN NOT NULL
            )
        """)
        
        # Create gate_status table
        await db.execute("""
            CREATE TABLE IF NOT EXISTS gate_status (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                timestamp TEXT NOT NULL
            )
        """)
        
        # Create settings table
        await db.execute("""
            CREATE TABLE IF NOT EXISTS settings (
                key TEXT PRIMARY KEY,
                value TEXT NOT NULL
            )
        """)
        
        # Insert default settings if they don't exist
        default_settings = {
            "maxOpenTimeSeconds": "300",
            "triggerDuration": "500",
            "mqtt": {
                "broker": "localhost",
                "port": "1883",
                "username": "",
                "password": "",
                "clientId": "gatekeeper",
                "enabled": False
            }
        }
        
        for key, value in default_settings.items():
            await db.execute(
                "INSERT OR IGNORE INTO settings (key, value) VALUES (?, ?)",
                (key, json.dumps(value))
            )
        
        await db.commit()

# Gate control
async def trigger_gate() -> bool:
    try:
        GPIO.output(RELAY_1_PIN, GPIO.HIGH)
        await asyncio.sleep(TRIGGER_DURATION / 1000)  # Convert to seconds
        GPIO.output(RELAY_1_PIN, GPIO.LOW)
        return True
    except Exception as e:
        logger.error(f"Error triggering gate: {e}")
        return False

last_open_time = None

async def check_auto_close():
    """Check if gate has been open too long and close it if needed"""
    global last_open_time
    while True:
        try:
            if GPIO.input(STATUS_PIN) == GPIO.HIGH:  # Gate is open
                current_time = datetime.now()
                
                # Initialize last_open_time if gate is open and time not set
                if last_open_time is None:
                    last_open_time = current_time
                
                # Get max open time from settings
                async with aiosqlite.connect(DB_PATH) as db:
                    cursor = await db.execute("SELECT value FROM settings WHERE key = 'maxOpenTimeSeconds'")
                    row = await cursor.fetchone()
                    max_open_time = int(json.loads(row[0])) if row else DEFAULT_MAX_OPEN_TIME
                
                # Check if gate has been open too long
                if (current_time - last_open_time).total_seconds() > max_open_time:
                    logger.warning(f"Gate has been open for more than {max_open_time} seconds. Auto-closing...")
                    await trigger_gate()
                    timestamp = current_time.isoformat()
                    
                    # Log auto-close event
                    async with aiosqlite.connect(DB_PATH) as db:
                        await db.execute(
                            "INSERT INTO events (timestamp, action, source, success) VALUES (?, ?, ?, ?)",
                            (timestamp, "auto-close", "system", True)
                        )
                        await db.commit()
            else:
                # Reset last_open_time when gate is closed
                last_open_time = None
                
        except Exception as e:
            logger.error(f"Error in auto-close check: {e}")
        
        await asyncio.sleep(1)  # Check every second

async def update_gate_status():
    """Monitor gate status and update database when it changes"""
    global last_open_time
    last_status = None
    
    while True:
        try:
            current_status = GPIO.input(STATUS_PIN) == GPIO.HIGH  # True = OPEN, False = CLOSED
            
            if last_status != current_status:
                timestamp = datetime.now()
                
                # Update last_open_time when gate opens
                if current_status:  # Gate just opened
                    last_open_time = timestamp
                else:  # Gate just closed
                    last_open_time = None
                
                # Update gate_status table
                async with aiosqlite.connect(DB_PATH) as db:
                    await db.execute(
                        "INSERT INTO gate_status (timestamp) VALUES (?)",
                        (timestamp.isoformat(),)
                    )
                    
                    # Log the status change as an event
                    status_str = "opened" if current_status else "closed"
                    await db.execute(
                        "INSERT INTO events (timestamp, action, source, success) VALUES (?, ?, ?, ?)",
                        (timestamp.isoformat(), f"gate {status_str}", "sensor", True)
                    )
                    await db.commit()
                
                # Update Home Assistant via MQTT
                await ha_mqtt.publish_state(current_status)
                last_status = current_status
                logger.info(f"Gate status changed to: {'open' if current_status else 'closed'}")
            
            await asyncio.sleep(0.5)  # Check every 500ms
            
        except Exception as e:
            logger.error(f"Error in update_gate_status: {e}")
            await asyncio.sleep(5)  # Wait longer on error

# MQQT Command Handler
async def handle_mqtt_command(should_open: bool):
    """Handle commands received from Home Assistant"""
    try:
        if should_open != (GPIO.input(STATUS_PIN) == GPIO.HIGH):
            await trigger_gate()
    except Exception as e:
        logger.error(f"Error handling MQTT command: {e}")

# API Routes
@app.post("/api/trigger")
async def trigger():
    success = await trigger_gate()
    timestamp = datetime.now().isoformat()
    current_status = GPIO.input(STATUS_PIN) == GPIO.HIGH
    action = "trigger gate"
    
    async with aiosqlite.connect(DB_PATH) as db:
        await db.execute(
            "INSERT INTO events (timestamp, action, source, success) VALUES (?, ?, ?, ?)",
            (timestamp, action, "api", success)
        )
        await db.commit()
    
    return {"success": success, "currentStatus": current_status}

@app.get("/api/status")
async def get_status():
    """Get current gate status"""
    is_open = GPIO.input(STATUS_PIN) == GPIO.HIGH
    
    # Get last status change time
    async with aiosqlite.connect(DB_PATH) as db:
        cursor = await db.execute(
            "SELECT timestamp FROM gate_status ORDER BY timestamp DESC LIMIT 1"
        )
        result = await cursor.fetchone()
        last_changed = result[0] if result else datetime.now().isoformat()
    
    return {
        "isOpen": is_open,
        "lastChanged": last_changed
    }

@app.get("/api/events")
async def get_events(limit: int = 10, offset: int = 0):
    """Get recent gate events with pagination"""
    async with aiosqlite.connect(DB_PATH) as db:
        db.row_factory = aiosqlite.Row
        
        # Get total count
        cursor = await db.execute("SELECT COUNT(*) as count FROM events")
        row = await cursor.fetchone()
        total_count = row['count']
        
        # Get paginated events
        cursor = await db.execute(
            """
            SELECT * FROM events 
            ORDER BY timestamp DESC 
            LIMIT ? OFFSET ?
            """,
            (limit, offset)
        )
        events = await cursor.fetchall()
        return {
            "events": [dict(event) for event in events],
            "total": total_count,
            "hasMore": (offset + limit) < total_count
        }

@app.get("/api/settings")
async def get_settings():
    """Get current settings"""
    async with aiosqlite.connect(DB_PATH) as db:
        cursor = await db.execute("SELECT key, value FROM settings")
        rows = await cursor.fetchall()
        settings = {}
        for key, value in rows:
            settings[key] = json.loads(value)
        
        return {
            "maxOpenTimeSeconds": settings.get("maxOpenTimeSeconds", "300"),
            "triggerDuration": settings.get("triggerDuration", "500"),
            "mqtt": settings.get("mqtt", {
                "broker": "localhost",
                "port": "1883",
                "username": "",
                "password": "",
                "clientId": "gatekeeper",
                "enabled": False
            })
        }

@app.post("/api/settings")
async def update_settings(settings: Settings):
    """Update settings"""
    try:
        async with aiosqlite.connect(DB_PATH) as db:
            # Update each setting
            for key, value in settings.dict().items():
                await db.execute(
                    "INSERT OR REPLACE INTO settings (key, value) VALUES (?, ?)",
                    (key, json.dumps(value))
                )
            await db.commit()
            
            # Update environment variables and MQTT connection
            if settings.mqtt:
                os.environ["MQTT_BROKER"] = settings.mqtt["broker"]
                os.environ["MQTT_PORT"] = settings.mqtt["port"]
                os.environ["MQTT_USERNAME"] = settings.mqtt["username"]
                os.environ["MQTT_PASSWORD"] = settings.mqtt["password"]
                os.environ["MQTT_CLIENT_ID"] = settings.mqtt["clientId"]
                
                # Enable/disable MQTT based on settings
                ha_mqtt.enable(settings.mqtt.get("enabled", False))

            # Log settings update event with details
            changes = []
            if settings.maxOpenTimeSeconds:
                changes.append(f"Max Open Time: {settings.maxOpenTimeSeconds}s")
            if settings.triggerDuration:
                changes.append(f"Trigger Duration: {settings.triggerDuration}ms")
            if settings.mqtt:
                mqtt_status = "Enabled" if settings.mqtt.get("enabled") else "Disabled"
                changes.append(f"MQTT: {mqtt_status}")
                if settings.mqtt.get("enabled"):
                    changes.append(f"Broker: {settings.mqtt['broker']}:{settings.mqtt['port']}")

            await db.execute(
                "INSERT INTO events (timestamp, action, source, success) VALUES (?, ?, ?, ?)",
                (
                    datetime.utcnow().isoformat(),
                    f"Settings Updated ({'; '.join(changes)})",
                    "Settings",
                    True
                )
            )
            await db.commit()

        return {"success": True}
    except Exception as e:
        # Log failure event
        async with aiosqlite.connect(DB_PATH) as db:
            await db.execute(
                "INSERT INTO events (timestamp, action, source, success) VALUES (?, ?, ?, ?)",
                (
                    datetime.utcnow().isoformat(),
                    f"Settings Update Failed: {str(e)}",
                    "Settings",
                    False
                )
            )
            await db.commit()
        raise HTTPException(status_code=500, detail=str(e))

# Serve static files
app.mount("/", StaticFiles(directory="../public", html=True), name="static")

# Background task for monitoring gate status
@app.on_event("startup")
async def startup_event():
    """Initialize the application on startup"""
    # Initialize database
    await init_db()
    
    # Setup GPIO
    setup_gpio()
    
    # Start background tasks
    app.state.status_task = asyncio.create_task(update_gate_status())
    app.state.auto_close_task = asyncio.create_task(check_auto_close())
    
    # Initialize MQTT from settings
    try:
        settings = await get_settings()
        if settings["mqtt"].get("enabled"):
            ha_mqtt.enable(True)
    except Exception as e:
        logger.error(f"Failed to initialize MQTT: {e}")

@app.on_event("shutdown")
async def shutdown_event():
    """Clean up on shutdown"""
    # Cancel background tasks
    if hasattr(app.state, "status_task"):
        app.state.status_task.cancel()
    if hasattr(app.state, "auto_close_task"):
        app.state.auto_close_task.cancel()
    
    # Disconnect MQTT
    await ha_mqtt.disconnect()
    
    # Cleanup GPIO
    GPIO.cleanup()
    logger.info("Application shutdown complete")