"""
Action Dispatcher — Executes actions generated by AI agents.
=============================================================
When an agent produces actions (send_whatsapp, create_meeting, etc.),
this dispatcher routes them to the correct integration service.
"""

import logging
from typing import Optional
from sqlalchemy.ext.asyncio import AsyncSession

logger = logging.getLogger("dealix.agents.dispatcher")


class ActionDispatcher:
    """
    Receives actions from AgentExecutor and dispatches them to
    the appropriate integration service (WhatsApp, Email, DB, etc.).
    """

    def __init__(self, db: AsyncSession):
        self.db = db

    async def dispatch(self, actions: list[dict], tenant_id: str = None) -> list[dict]:
        """Execute a list of agent-generated actions."""
        results = []
        for action in actions:
            action_type = action.get("type", "")
            try:
                result = await self._execute_action(action_type, action, tenant_id)
                results.append({
                    "type": action_type,
                    "status": "success",
                    "result": result,
                })
                logger.info(f"Action dispatched: {action_type} → success")
            except Exception as e:
                results.append({
                    "type": action_type,
                    "status": "error",
                    "error": str(e),
                })
                logger.error(f"Action dispatch failed: {action_type} → {e}")
        return results

    async def _execute_action(self, action_type: str, action: dict, tenant_id: str) -> dict:
        """Route action to the correct handler."""
        handlers = {
            "send_whatsapp": self._handle_send_whatsapp,
            "send_email": self._handle_send_email,
            "queue_message": self._handle_queue_message,
            "queue_ab_variant": self._handle_queue_ab_variant,
            "create_meeting": self._handle_create_meeting,
            "update_lead_score": self._handle_update_lead_score,
            "trigger_event": self._handle_trigger_event,
            "generate_payment_link": self._handle_generate_payment_link,
            "create_proposal": self._handle_create_proposal,
            "block_action": self._handle_block_action,
            "suspend_entity": self._handle_suspend_entity,
            "process_refund": self._handle_process_refund,
            "send_retention_offer": self._handle_send_retention_offer,
        }

        handler = handlers.get(action_type)
        if not handler:
            logger.warning(f"No handler for action type: {action_type}")
            return {"status": "skipped", "reason": f"Unknown action type: {action_type}"}

        return await handler(action, tenant_id)

    # ── WhatsApp ─────────────────────────────────────

    async def _handle_send_whatsapp(self, action: dict, tenant_id: str) -> dict:
        """Send a WhatsApp message."""
        from app.integrations.whatsapp import send_whatsapp_message

        phone = action.get("phone", "")
        message = action.get("message", "")

        if not phone or not message:
            return {"status": "skipped", "reason": "Missing phone or message"}

        result = await send_whatsapp_message(phone, message)

        # Log to messages table
        try:
            from app.models.message import Message
            import uuid
            msg = Message(
                tenant_id=uuid.UUID(tenant_id) if tenant_id else None,
                channel="whatsapp",
                direction="outbound",
                content=message,
                status="sent" if result.get("status") == "success" else "failed",
                extra_metadata={"action": "agent_auto_send", "result": result},
            )
            self.db.add(msg)
            await self.db.flush()
        except Exception as e:
            logger.error(f"Failed to log WhatsApp message: {e}")

        return result

    # ── Email ────────────────────────────────────────

    async def _handle_send_email(self, action: dict, tenant_id: str) -> dict:
        """Send an email."""
        from app.integrations.email_sender import send_email

        email = action.get("email", "")
        message = action.get("message", "")
        subject = action.get("subject", "Dealix — رسالة جديدة")

        if not email or not message:
            return {"status": "skipped", "reason": "Missing email or message"}

        result = await send_email(email, subject, message)

        # Log to messages table
        try:
            from app.models.message import Message
            import uuid
            msg = Message(
                tenant_id=uuid.UUID(tenant_id) if tenant_id else None,
                channel="email",
                direction="outbound",
                content=message,
                status="sent" if result.get("status") == "sent" else "failed",
                extra_metadata={"action": "agent_auto_send", "subject": subject},
            )
            self.db.add(msg)
            await self.db.flush()
        except Exception as e:
            logger.error(f"Failed to log email message: {e}")

        return result

    # ── Message Queue ────────────────────────────────

    async def _handle_queue_message(self, action: dict, tenant_id: str) -> dict:
        """Queue a message for scheduled sending."""
        channel = action.get("channel", "whatsapp")
        message = action.get("message", "")
        optimal_time = action.get("optimal_send_time")

        if optimal_time:
            # Schedule for later — use Celery task
            try:
                from app.workers.message_tasks import send_scheduled_message
                send_scheduled_message.apply_async(
                    args=[channel, message, tenant_id],
                    countdown=self._calculate_delay(optimal_time),
                )
                return {"status": "queued", "send_time": optimal_time}
            except Exception:
                pass

        # Send immediately if no schedule
        if channel == "whatsapp":
            return await self._handle_send_whatsapp(action, tenant_id)
        elif channel == "email":
            return await self._handle_send_email(action, tenant_id)

        return {"status": "queued", "channel": channel}

    async def _handle_queue_ab_variant(self, action: dict, tenant_id: str) -> dict:
        """Store an A/B variant for testing."""
        return {
            "status": "stored",
            "variant": "B",
            "message_preview": action.get("message", "")[:100],
        }

    # ── Meeting ──────────────────────────────────────

    async def _handle_create_meeting(self, action: dict, tenant_id: str) -> dict:
        """Create a meeting booking."""
        try:
            from app.models.ai_conversation import AutoBooking
            import uuid
            from datetime import datetime

            dt_str = action.get("datetime", "")
            meeting_dt = datetime.fromisoformat(dt_str) if dt_str else datetime.utcnow()

            booking = AutoBooking(
                tenant_id=uuid.UUID(tenant_id) if tenant_id else None,
                lead_id=uuid.UUID(action["lead_id"]) if action.get("lead_id") else None,
                meeting_type=action.get("type", "demo"),
                meeting_datetime=meeting_dt,
                duration_minutes=action.get("duration_minutes", 30),
                client_name=action.get("client_name", ""),
                status="scheduled",
            )
            self.db.add(booking)
            await self.db.flush()

            return {"status": "booked", "booking_id": str(booking.id), "datetime": dt_str}
        except Exception as e:
            return {"status": "error", "detail": str(e)}

    # ── Lead Score ───────────────────────────────────

    async def _handle_update_lead_score(self, action: dict, tenant_id: str) -> dict:
        """Update lead score in database."""
        try:
            from app.models.lead import Lead
            from sqlalchemy import update
            import uuid

            lead_id = action.get("lead_id")
            if not lead_id:
                return {"status": "skipped", "reason": "No lead_id"}

            await self.db.execute(
                update(Lead)
                .where(Lead.id == uuid.UUID(lead_id))
                .values(
                    score=action.get("score", 0),
                    status=action.get("status", "contacted"),
                )
            )
            await self.db.flush()

            return {
                "status": "updated",
                "lead_id": lead_id,
                "score": action.get("score"),
                "classification": action.get("classification"),
            }
        except Exception as e:
            return {"status": "error", "detail": str(e)}

    # ── Event Trigger ────────────────────────────────

    async def _handle_trigger_event(self, action: dict, tenant_id: str) -> dict:
        """Trigger a new event in the agent system."""
        event_type = action.get("event", "")
        lead_id = action.get("lead_id", "")

        try:
            from app.workers.agent_tasks import process_agent_event
            process_agent_event.delay(
                event_type=event_type,
                input_data={"lead_id": lead_id, "auto_triggered": True},
                tenant_id=tenant_id,
                lead_id=lead_id,
            )
            return {"status": "triggered", "event": event_type}
        except Exception:
            # Fallback: execute synchronously
            return {"status": "queued_fallback", "event": event_type}

    # ── Payment ──────────────────────────────────────

    async def _handle_generate_payment_link(self, action: dict, tenant_id: str) -> dict:
        """Generate a payment link via Stripe or manual."""
        amount = action.get("amount_sar", 0)
        lead_id = action.get("lead_id", "")

        # TODO: Integrate with Stripe when configured
        return {
            "status": "generated",
            "amount_sar": amount,
            "payment_link": f"https://pay.dealix.sa/invoice/{lead_id}",
            "note": "Mock payment link — Stripe integration pending",
        }

    # ── Proposal ─────────────────────────────────────

    async def _handle_create_proposal(self, action: dict, tenant_id: str) -> dict:
        """Create a proposal in the database."""
        try:
            from app.models.proposal import Proposal
            import uuid

            proposal_data = action.get("proposal_data", {})
            proposal = Proposal(
                tenant_id=uuid.UUID(tenant_id) if tenant_id else None,
                lead_id=uuid.UUID(action["lead_id"]) if action.get("lead_id") else None,
                title=proposal_data.get("id", "Auto-Generated Proposal"),
                content=proposal_data,
                status="draft",
            )
            self.db.add(proposal)
            await self.db.flush()

            return {"status": "created", "proposal_id": str(proposal.id)}
        except Exception as e:
            return {"status": "error", "detail": str(e)}

    # ── Compliance ───────────────────────────────────

    async def _handle_block_action(self, action: dict, tenant_id: str) -> dict:
        """Block an action due to compliance failure."""
        logger.warning(
            f"⚠️ ACTION BLOCKED by compliance: {action.get('reason')} "
            f"Issues: {action.get('issues')}"
        )
        return {
            "status": "blocked",
            "reason": action.get("reason"),
            "issues_count": len(action.get("issues", [])),
        }

    # ── Fraud ────────────────────────────────────────

    async def _handle_suspend_entity(self, action: dict, tenant_id: str) -> dict:
        """Suspend an entity flagged for fraud."""
        entity_type = action.get("entity_type", "unknown")
        risk_score = action.get("risk_score", 0)

        logger.critical(
            f"🚨 FRAUD ALERT: Suspending {entity_type} — risk_score={risk_score} "
            f"affected={action.get('affected')}"
        )

        # TODO: Update entity status in DB
        return {
            "status": "suspended",
            "entity_type": entity_type,
            "risk_score": risk_score,
        }

    # ── Refund ───────────────────────────────────────

    async def _handle_process_refund(self, action: dict, tenant_id: str) -> dict:
        """Process a guarantee refund."""
        amount = action.get("amount_sar", 0)
        customer_id = action.get("customer_id", "")

        logger.info(f"💰 Refund initiated: {amount} SAR for customer {customer_id}")

        # TODO: Integrate with Stripe refund API
        return {
            "status": "initiated",
            "amount_sar": amount,
            "customer_id": customer_id,
            "note": "Refund processing — manual verification required for amounts > 5000 SAR",
        }

    # ── Retention ────────────────────────────────────

    async def _handle_send_retention_offer(self, action: dict, tenant_id: str) -> dict:
        """Send a retention offer to a churning customer."""
        offer = action.get("offer", {})
        customer_id = action.get("customer_id", "")

        logger.info(
            f"🎁 Retention offer for customer {customer_id}: "
            f"{offer.get('discount_percent', 0)}% discount + "
            f"{offer.get('free_months', 0)} free months"
        )

        return {
            "status": "sent",
            "offer": offer,
            "customer_id": customer_id,
        }

    # ── Helpers ──────────────────────────────────────

    @staticmethod
    def _calculate_delay(optimal_time: str) -> int:
        """Calculate delay in seconds until optimal send time."""
        from datetime import datetime, timezone

        try:
            now = datetime.now(timezone.utc)
            # Parse HH:MM format
            hour, minute = map(int, optimal_time.split(":"))
            target = now.replace(hour=hour, minute=minute, second=0)
            if target <= now:
                # Next day
                from datetime import timedelta
                target += timedelta(days=1)
            return max(0, int((target - now).total_seconds()))
        except Exception:
            return 0  # Send immediately on parse error