from flask import jsonify, request
from flask_jwt_extended import jwt_required, get_jwt_identity
from . import api_bp
from ..models import Message, Conversation, Workspace
from ..schemas import MessageSchema, MessageCreateSchema
from ..services import MessageService


message_schema = MessageSchema()
message_create_schema = MessageCreateSchema()


@api_bp.route("/conversations/<int:conversation_id>/messages", methods=["GET"])
@jwt_required()
def get_messages(conversation_id):
    user_id = get_jwt_identity()
    conversation = Conversation.query.filter_by(id=conversation_id).first()
    if not conversation:
        return jsonify({"error": "会话不存在"}), 404

    workspace = Workspace.query.filter_by(
        id=conversation.workspace_id, user_id=user_id
    ).first()
    if not workspace:
        return jsonify({"error": "无权访问此会话"}), 403

    messages = (
        Message.query.filter_by(conversation_id=conversation_id)
        .order_by(Message.created_at)
        .all()
    )
    return jsonify(message_schema.dump(messages, many=True))


@api_bp.route("/conversations/<int:conversation_id>/messages", methods=["POST"])
@jwt_required()
def create_message(conversation_id):
    user_id = get_jwt_identity()
    conversation = Conversation.query.filter_by(id=conversation_id).first()
    if not conversation:
        return jsonify({"error": "会话不存在"}), 404

    workspace = Workspace.query.filter_by(
        id=conversation.workspace_id, user_id=user_id
    ).first()
    if not workspace:
        return jsonify({"error": "无权访问此会话"}), 403

    data = request.get_json()
    errors = message_create_schema.validate(data)
    if errors:
        return jsonify({"error": errors}), 400

    try:
        message = MessageService.create_message(conversation_id, data)
        return jsonify(message_schema.dump(message)), 201
    except ValueError as e:
        return jsonify({"error": str(e)}), 400