from uuid import UUID

from fastapi import APIRouter, Depends, HTTPException, Response, status
from pydantic import BaseModel, Field
from sqlalchemy.orm import Session

from .api_key_auth import current_api_user
from .database import get_db
from .message_send_service import SendMessageError, send_template_messages
from .models import UserAccount

router = APIRouter(prefix="/api/v1/messages", tags=["messages"])

SEND_SMS_EXPLORER = {
    "id": "send-sms",
    "method": "POST",
    "path": "/api/v1/messages/send",
    "title": "Send template SMS",
    "summary": "Send a DLT-approved SMS using an API key, approved sender ID, and template.",
    "authentication": {
        "type": "api_key",
        "header": "Authorization",
        "format": "Bearer urmi_live_<key>",
        "alternate_header": "X-Api-Key",
    },
    "request_body": {
        "sender_id": {
            "type": "string",
            "required": True,
            "description": "Approved DLT sender header, e.g. URMIAI",
            "example": "URMIAI",
        },
        "template_id": {
            "type": "uuid",
            "required": True,
            "description": "Approved template UUID from Message settings",
        },
        "to": {
            "type": "string",
            "required": True,
            "description": "Recipient mobile number with country code, e.g. 919999999999",
            "example": "919999999999",
        },
        "message": {
            "type": "string",
            "required": True,
            "description": "Final SMS text with all {#var#} / {#num#} placeholders replaced",
            "example": "Your URMI app verification code is 482916. It is valid for 10 minutes. Do not share it to anyone - URMI AI",
        },
    },
    "responses": {
        "200": {
            "description": "SMS accepted by the gateway",
            "example": {
                "success": True,
                "job_id": "123456789",
                "message_id": "987654321",
                "to": "919999999999",
                "sender_id": "URMIAI",
                "template_id": "00000000-0000-0000-0000-000000000001",
                "template_name": "URMI_OTP_VERIFICATION",
                "dlt_template_id": "1777178797989033323",
            },
        },
        "401": {"description": "Missing or invalid API key"},
        "404": {"description": "Sender or template not found for this account"},
        "422": {"description": "Template mismatch or gateway rejection"},
        "502": {"description": "SMS gateway request failed"},
        "503": {"description": "SMS gateway credentials are not configured"},
    },
}


class SendMessageRequest(BaseModel):
    sender_id: str = Field(min_length=3, max_length=11)
    template_id: UUID
    to: str = Field(min_length=10, max_length=15)
    message: str = Field(min_length=1, max_length=1000)


@router.get("/docs/send")
def send_message_docs() -> dict:
    return SEND_SMS_EXPLORER


def _raise_send_error(error: SendMessageError) -> None:
    raise HTTPException(status_code=error.status_code, detail=error.detail)


@router.post("/send")
def send_message(
    payload: SendMessageRequest,
    db: Session = Depends(get_db),
    user: UserAccount = Depends(current_api_user),
) -> dict:
    try:
        result = send_template_messages(
            db,
            user,
            sender_id=payload.sender_id,
            template_id=payload.template_id,
            message=payload.message,
            recipients=[payload.to],
        )
    except SendMessageError as exc:
        _raise_send_error(exc)

    first = result["results"][0]
    return {
        "success": result["success"],
        "job_id": first["job_id"],
        "message_id": first["message_id"],
        "to": first["to"],
        "sender_id": result["sender_id"],
        "template_id": result["template_id"],
        "template_name": result["template_name"],
        "dlt_template_id": result["dlt_template_id"],
    }