from fastapi import APIRouter, HTTPException, Depends, Query
from app.database import get_supabase
from app.dependencies import get_current_user
from app.config import PLAN_LIMITS
from app.models import InboxConversation, InboxMessage, ConversationStatusUpdate, AgentReplyCreate
from typing import List, Optional
import uuid
import logging

logger = logging.getLogger(__name__)
router = APIRouter(prefix="/inbox", tags=["Inbox"])


def _check_inbox_access(user_id: str, supabase):
    sub = supabase.table("subscriptions").select("plan").eq("user_id", user_id).eq("status", "active").execute()
    plan = sub.data[0]["plan"] if sub.data else "free"
    if plan not in ("starter", "business", "agency", "enterprise"):
        raise HTTPException(status_code=402, detail="Conversation inbox requires Starter plan or higher")
    return plan


def _get_user_company_id(user_id: str, supabase) -> str:
    result = supabase.table("companies").select("id").eq("owner_id", user_id).execute()
    if not result.data:
        raise HTTPException(status_code=404, detail="Company not found")
    return result.data[0]["id"]


@router.get("/conversations", response_model=List[InboxConversation])
async def list_inbox_conversations(
    chatbot_id: Optional[str] = Query(None),
    page: int = Query(1, ge=1),
    limit: int = Query(20, ge=1, le=100),
    user=Depends(get_current_user),
):
    """List conversations for all (or one) of the user's chatbots."""
    supabase = get_supabase()
    _check_inbox_access(user.id, supabase)
    company_id = _get_user_company_id(user.id, supabase)

    # Get user's chatbots
    chatbots_query = supabase.table("chatbots").select("id, name").eq("company_id", company_id)
    if chatbot_id:
        chatbots_query = chatbots_query.eq("id", chatbot_id)
    chatbots_result = chatbots_query.execute()
    chatbot_map = {c["id"]: c["name"] for c in (chatbots_result.data or [])}

    if not chatbot_map:
        return []

    chatbot_ids = list(chatbot_map.keys())
    offset = (page - 1) * limit

    # Query conversations
    convs = supabase.table("conversations").select("*") \
        .in_("chatbot_id", chatbot_ids) \
        .order("created_at", desc=True) \
        .range(offset, offset + limit - 1) \
        .execute()

    results = []
    for conv in (convs.data or []):
        cid = conv["id"]

        # Get first user message for preview
        first_msg = supabase.table("messages").select("content") \
            .eq("conversation_id", cid) \
            .eq("role", "user") \
            .order("created_at", desc=False) \
            .limit(1) \
            .execute()

        first_message_text = first_msg.data[0]["content"] if first_msg.data else None

        results.append(InboxConversation(
            id=cid,
            chatbot_id=conv["chatbot_id"],
            chatbot_name=chatbot_map.get(conv["chatbot_id"], "Unknown"),
            session_id=conv.get("session_id"),
            language=conv.get("language", "en"),
            message_count=conv.get("message_count", 0),
            first_message=first_message_text,
            status=conv.get("status", "open"),
            last_agent_reply_at=conv.get("last_agent_reply_at"),
            created_at=conv.get("created_at"),
        ))

    return results


@router.get("/conversations/{conversation_id}")
async def get_inbox_conversation(
    conversation_id: str,
    user=Depends(get_current_user),
):
    """Get a full conversation thread with all messages."""
    supabase = get_supabase()
    _check_inbox_access(user.id, supabase)
    company_id = _get_user_company_id(user.id, supabase)

    # Verify ownership
    conv = supabase.table("conversations").select("*, chatbots(company_id, name)") \
        .eq("id", conversation_id) \
        .execute()

    if not conv.data:
        raise HTTPException(status_code=404, detail="Conversation not found")

    c = conv.data[0]
    chatbot_data = c.get("chatbots") or {}
    if chatbot_data.get("company_id") != company_id:
        raise HTTPException(status_code=403, detail="Not authorized")

    # Get messages
    msgs = supabase.table("messages").select("*") \
        .eq("conversation_id", conversation_id) \
        .order("created_at", desc=False) \
        .execute()

    messages = [
        InboxMessage(
            id=m["id"],
            role=m["role"],
            content=m["content"],
            sources=m.get("sources"),
            confidence_score=m.get("confidence_score"),
            is_handoff=m.get("is_handoff", False),
            created_at=m.get("created_at"),
        )
        for m in (msgs.data or [])
    ]

    return {
        "conversation_id": conversation_id,
        "chatbot_name": chatbot_data.get("name", "Unknown"),
        "language": c.get("language", "en"),
        "session_id": c.get("session_id"),
        "created_at": c.get("created_at"),
        "messages": [m.model_dump() for m in messages],
    }


@router.patch("/conversations/{conversation_id}/status")
async def update_conversation_status(
    conversation_id: str,
    data: ConversationStatusUpdate,
    user=Depends(get_current_user),
):
    """Update conversation status (open, agent_handling, resolved)."""
    if data.status not in ("open", "agent_handling", "resolved"):
        raise HTTPException(status_code=400, detail="Invalid status")

    supabase = get_supabase()
    _check_inbox_access(user.id, supabase)
    company_id = _get_user_company_id(user.id, supabase)

    conv = supabase.table("conversations").select("*, chatbots(company_id)") \
        .eq("id", conversation_id).execute()
    if not conv.data:
        raise HTTPException(status_code=404, detail="Conversation not found")
    if conv.data[0].get("chatbots", {}).get("company_id") != company_id:
        raise HTTPException(status_code=403, detail="Not authorized")

    supabase.table("conversations").update({"status": data.status}).eq("id", conversation_id).execute()
    return {"success": True, "status": data.status}


@router.post("/conversations/{conversation_id}/reply")
async def agent_reply(
    conversation_id: str,
    data: AgentReplyCreate,
    user=Depends(get_current_user),
):
    """Send an agent reply to a conversation."""
    supabase = get_supabase()
    _check_inbox_access(user.id, supabase)
    company_id = _get_user_company_id(user.id, supabase)

    conv = supabase.table("conversations").select("*, chatbots(company_id)") \
        .eq("id", conversation_id).execute()
    if not conv.data:
        raise HTTPException(status_code=404, detail="Conversation not found")
    if conv.data[0].get("chatbots", {}).get("company_id") != company_id:
        raise HTTPException(status_code=403, detail="Not authorized")

    msg_id = str(uuid.uuid4())
    supabase.table("messages").insert({
        "id": msg_id,
        "conversation_id": conversation_id,
        "role": "agent",
        "content": data.message,
    }).execute()

    # Mark as agent_handling if not already, and record reply time
    current_status = conv.data[0].get("status", "open")
    update_data: dict = {"last_agent_reply_at": "now()"}
    if current_status == "open":
        update_data["status"] = "agent_handling"
    supabase.table("conversations").update(update_data).eq("id", conversation_id).execute()

    return {"success": True, "message_id": msg_id}


@router.delete("/conversations/{conversation_id}")
async def delete_inbox_conversation(
    conversation_id: str,
    user=Depends(get_current_user),
):
    """Delete a conversation and all its messages."""
    supabase = get_supabase()
    _check_inbox_access(user.id, supabase)
    company_id = _get_user_company_id(user.id, supabase)

    # Verify ownership
    conv = supabase.table("conversations").select("*, chatbots(company_id)") \
        .eq("id", conversation_id).execute()

    if not conv.data:
        raise HTTPException(status_code=404, detail="Conversation not found")

    chatbot_data = conv.data[0].get("chatbots") or {}
    if chatbot_data.get("company_id") != company_id:
        raise HTTPException(status_code=403, detail="Not authorized")

    supabase.table("conversations").delete().eq("id", conversation_id).execute()
    return {"success": True}