"""
core/snitch.py - Snitch system for medication compliance

Handles snitch triggers, contact selection, and notification delivery.
"""

import json
import uuid
from datetime import datetime, timedelta, date
from typing import Optional, Dict, List, Tuple
import core.postgres as postgres
import core.notifications as notifications
from core.tz import user_today_for


def get_snitch_settings(user_uuid: str) -> Optional[Dict]:
    """Get user's snitch settings."""
    rows = postgres.select("snitch_settings", {"user_uuid": user_uuid})
    if rows:
        return rows[0]
    return None


def get_snitch_contacts(user_uuid: str, active_only: bool = True) -> List[Dict]:
    """Get user's snitch contacts ordered by priority."""
    where = {"user_uuid": user_uuid}
    if active_only:
        where["is_active"] = True

    rows = postgres.select("snitch_contacts", where)
    # Sort by priority (lower = higher priority)
    return sorted(rows, key=lambda x: x.get("priority", 1))


def get_todays_snitch_count(user_uuid: str) -> int:
    """Get number of snitches sent today (in the user's local timezone)."""
    today = user_today_for(user_uuid)

    # Query snitch log for today
    rows = postgres.select("snitch_log", {"user_uuid": user_uuid})

    # Filter to today's entries
    today_count = 0
    for row in rows:
        sent_at = row.get("sent_at")
        if sent_at and hasattr(sent_at, "date") and sent_at.date() == today:
            today_count += 1

    return today_count


def get_last_snitch_time(user_uuid: str) -> Optional[datetime]:
    """Get timestamp of last snitch for cooldown check."""
    rows = postgres.select(
        "snitch_log", {"user_uuid": user_uuid}, order_by="sent_at DESC", limit=1
    )

    if rows:
        return rows[0].get("sent_at")
    return None


def check_cooldown(user_uuid: str, cooldown_hours: int) -> bool:
    """Check if enough time has passed since last snitch."""
    last_snitch = get_last_snitch_time(user_uuid)
    if not last_snitch:
        return True

    cooldown_period = timedelta(hours=cooldown_hours)
    return datetime.utcnow() - last_snitch >= cooldown_period


def should_snitch(
    user_uuid: str, med_id: str, nag_count: int, missed_doses: int = 1
) -> Tuple[bool, str, Optional[Dict]]:
    """
    Determine if we should trigger a snitch.

    Returns:
        (should_snitch: bool, reason: str, settings: Optional[Dict])
    """
    settings = get_snitch_settings(user_uuid)

    if not settings:
        return False, "No snitch settings found", None

    if not settings.get("snitch_enabled"):
        return False, "Snitching disabled", settings

    # Check consent
    if settings.get("require_consent") and not settings.get("consent_given"):
        return False, "Consent not given", settings

    # Check rate limit
    max_per_day = settings.get("max_snitches_per_day", 2)
    if get_todays_snitch_count(user_uuid) >= max_per_day:
        return False, f"Max snitches per day reached ({max_per_day})", settings

    # Check cooldown
    cooldown_hours = settings.get("snitch_cooldown_hours", 4)
    if not check_cooldown(user_uuid, cooldown_hours):
        return False, f"Cooldown period not elapsed ({cooldown_hours}h)", settings

    # Check triggers
    trigger_after_nags = settings.get("trigger_after_nags", 4)
    trigger_after_doses = settings.get("trigger_after_missed_doses", 1)

    triggered_by_nags = nag_count >= trigger_after_nags
    triggered_by_doses = missed_doses >= trigger_after_doses

    if not triggered_by_nags and not triggered_by_doses:
        return (
            False,
            f"Triggers not met (nags: {nag_count}/{trigger_after_nags}, doses: {missed_doses}/{trigger_after_doses})",
            settings,
        )

    # Determine trigger reason
    if triggered_by_nags and triggered_by_doses:
        reason = "max_nags_and_missed_doses"
    elif triggered_by_nags:
        reason = "max_nags"
    else:
        reason = "missed_doses"

    return True, reason, settings


def select_contacts_to_notify(user_uuid: str) -> List[Dict]:
    """Select which contacts to notify based on priority settings."""
    contacts = get_snitch_contacts(user_uuid)

    if not contacts:
        return []

    # If any contact has notify_all=True, notify all active contacts
    notify_all = any(c.get("notify_all") for c in contacts)

    if notify_all:
        return contacts

    # Otherwise, notify only the highest priority contact(s)
    highest_priority = contacts[0].get("priority", 1)
    return [c for c in contacts if c.get("priority", 1) == highest_priority]


def build_snitch_message(
    user_uuid: str,
    contact_name: str,
    med_name: str,
    nag_count: int,
    missed_doses: int,
    trigger_reason: str,
    typical_schedule: str = "",
) -> str:
    """Build the snitch notification message."""

    # Get user info
    users = postgres.select("users", {"id": user_uuid})
    username = users[0].get("username", "Unknown") if users else "Unknown"

    message_parts = [
        f"🚨 Medication Alert for {username}",
        "",
        f"Contact: {contact_name}",
        f"Medication: {med_name}",
        f"Issue: Missed dose",
    ]

    if nag_count > 0:
        message_parts.append(f"Reminders sent: {nag_count} times")

    if missed_doses > 1:
        message_parts.append(f"Total missed doses today: {missed_doses}")

    if typical_schedule:
        message_parts.append(f"Typical schedule: {typical_schedule}")

    message_parts.extend(
        [
            "",
            f"Triggered by: {trigger_reason}",
            f"Time: {datetime.utcnow().strftime('%Y-%m-%d %H:%M UTC')}",
        ]
    )

    return "\n".join(message_parts)


def send_snitch(
    user_uuid: str,
    med_id: str,
    med_name: str,
    nag_count: int,
    missed_doses: int = 1,
    trigger_reason: str = "max_nags",
) -> List[Dict]:
    """
    Send snitch notifications to selected contacts.

    Returns:
        List of delivery results
    """
    results = []
    contacts = select_contacts_to_notify(user_uuid)

    if not contacts:
        return [{"success": False, "error": "No contacts configured"}]

    # Get typical schedule for context
    meds = postgres.select("medications", {"id": med_id})
    typical_times = meds[0].get("times", []) if meds else []
    typical_schedule = ", ".join(typical_times) if typical_times else "Not scheduled"

    for contact in contacts:
        contact_id = contact.get("id")
        contact_name = contact.get("contact_name")
        contact_type = contact.get("contact_type")
        contact_value = contact.get("contact_value")

        # Build message
        message = build_snitch_message(
            user_uuid,
            contact_name,
            med_name,
            nag_count,
            missed_doses,
            trigger_reason,
            typical_schedule,
        )

        # Send based on contact type
        delivered = False
        error_msg = None

        try:
            if contact_type == "discord":
                # Send via Discord DM
                delivered = _send_discord_snitch(contact_value, message)
            elif contact_type == "email":
                # Send via email (requires email setup)
                delivered = _send_email_snitch(contact_value, message)
            elif contact_type == "sms":
                # Send via SMS (requires SMS provider)
                delivered = _send_sms_snitch(contact_value, message)
            else:
                error_msg = f"Unknown contact type: {contact_type}"
        except Exception as e:
            error_msg = str(e)
            delivered = False

        # Log the snitch
        log_data = {
            "id": str(uuid.uuid4()),
            "user_uuid": user_uuid,
            "contact_id": contact_id,
            "medication_id": med_id,
            "trigger_reason": trigger_reason,
            "snitch_count_today": get_todays_snitch_count(user_uuid) + 1,
            "message_content": message,
            "sent_at": datetime.utcnow(),
            "delivered": delivered,
        }
        postgres.insert("snitch_log", log_data)

        results.append(
            {
                "contact_id": contact_id,
                "contact_name": contact_name,
                "contact_type": contact_type,
                "delivered": delivered,
                "error": error_msg,
            }
        )

    return results


def _send_discord_snitch(discord_user_id: str, message: str) -> bool:
    """Send snitch via Discord DM."""
    # This will be implemented in the bot
    # For now, we'll store it to be sent by the bot's presence loop
    # In a real implementation, you'd use discord.py to send the message
    import os

    # Store in a queue for the bot to pick up
    # Or use the existing notification system if it supports Discord
    try:
        # Try to use the existing notification system
        # This is a placeholder - actual implementation would use discord.py
        return True
    except Exception as e:
        print(f"Error sending Discord snitch: {e}")
        return False


def _send_email_snitch(email: str, message: str) -> bool:
    """Send snitch via email."""
    # Placeholder - requires email provider setup
    print(f"Would send email to {email}: {message[:50]}...")
    return True


def _send_sms_snitch(phone: str, message: str) -> bool:
    """Send snitch via SMS."""
    # Placeholder - requires SMS provider (Twilio, etc.)
    print(f"Would send SMS to {phone}: {message[:50]}...")
    return True


def update_consent(user_uuid: str, consent_given: bool):
    """Update user's snitch consent status."""
    data = {
        "id": str(uuid.uuid4()),
        "user_uuid": user_uuid,
        "snitch_enabled": False,  # Disabled until fully configured
        "consent_given": consent_given,
        "created_at": datetime.utcnow(),
        "updated_at": datetime.utcnow(),
    }
    postgres.upsert(
        "snitch_settings",
        data,
        conflict_columns=["user_uuid"],
    )


def get_snitch_history(user_uuid: str, days: int = 7) -> List[Dict]:
    """Get snitch history for the last N days."""
    cutoff = datetime.utcnow() - timedelta(days=days)

    rows = postgres.select("snitch_log", {"user_uuid": user_uuid})

    # Filter to recent entries
    recent = [row for row in rows if row.get("sent_at") and row["sent_at"] >= cutoff]

    return recent