#
#  Copyright 2024 The InfiniFlow Authors. All Rights Reserved.
#
#  Licensed under the Apache License, Version 2.0 (the "License");
#  you may not use this file except in compliance with the License.
#  You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
#  Unless required by applicable law or agreed to in writing, software
#  distributed under the License is distributed on an "AS IS" BASIS,
#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#  See the License for the specific language governing permissions and
#  limitations under the License.
#
import json
from uuid import uuid4

from flask import request, Response

from api.db import StatusEnum
from api.db.services.dialog_service import DialogService, ConversationService, chat
from api.settings import RetCode
from api.utils import get_uuid
from api.utils.api_utils import get_data_error_result
from api.utils.api_utils import get_json_result, token_required


@manager.route('/save', methods=['POST'])
@token_required
def set_conversation(tenant_id):
    req = request.json
    conv_id = req.get("id")
    if "assistant_id" in req:
        req["dialog_id"] = req.pop("assistant_id")
    if "id" in req:
        del req["id"]
        conv = ConversationService.query(id=conv_id)
        if not conv:
            return get_data_error_result(retmsg="Session does not exist")
        if not DialogService.query(id=conv[0].dialog_id, tenant_id=tenant_id, status=StatusEnum.VALID.value):
            return get_data_error_result(retmsg="You do not own the session")
        if req.get("dialog_id"):
            dia = DialogService.query(tenant_id=tenant_id, id=req["dialog_id"], status=StatusEnum.VALID.value)
            if not dia:
                return get_data_error_result(retmsg="You do not own the assistant")
        if "dialog_id" in req and not req.get("dialog_id"):
            return get_data_error_result(retmsg="assistant_id can not be empty.")
        if "message" in req:
            return get_data_error_result(retmsg="message can not be change")
        if "reference" in req:
            return get_data_error_result(retmsg="reference can not be change")
        if "name" in req and not req.get("name"):
            return get_data_error_result(retmsg="name can not be empty.")
        if not ConversationService.update_by_id(conv_id, req):
            return get_data_error_result(retmsg="Session updates error")
        return get_json_result(data=True)

    if not req.get("dialog_id"):
        return get_data_error_result(retmsg="assistant_id is required.")
    dia = DialogService.query(tenant_id=tenant_id, id=req["dialog_id"], status=StatusEnum.VALID.value)
    if not dia:
        return get_data_error_result(retmsg="You do not own the assistant")
    conv = {
        "id": get_uuid(),
        "dialog_id": req["dialog_id"],
        "name": req.get("name", "New session"),
        "message": [{"role": "assistant", "content": "Hi! I am your assistant，can I help you?"}]
    }
    if not conv.get("name"):
        return get_data_error_result(retmsg="name can not be empty.")
    ConversationService.save(**conv)
    e, conv = ConversationService.get_by_id(conv["id"])
    if not e:
        return get_data_error_result(retmsg="Fail to new session!")
    conv = conv.to_dict()
    conv['messages'] = conv.pop("message")
    conv["assistant_id"] = conv.pop("dialog_id")
    del conv["reference"]
    return get_json_result(data=conv)


@manager.route('/completion', methods=['POST'])
@token_required
def completion(tenant_id):
    req = request.json
    # req = {"conversation_id": "9aaaca4c11d311efa461fa163e197198", "messages": [
    #    {"role": "user", "content": "上海有吗？"}
    # ]}
    if "id" not in req:
        return get_data_error_result(retmsg="id is required")
    conv = ConversationService.query(id=req["id"])
    if not conv:
        return get_data_error_result(retmsg="Session does not exist")
    conv = conv[0]
    if not DialogService.query(id=conv.dialog_id, tenant_id=tenant_id, status=StatusEnum.VALID.value):
        return get_data_error_result(retmsg="You do not own the session")
    msg = []
    question = {
        "content": req.get("question"),
        "role": "user",
        "id": str(uuid4())
    }
    conv.message.append(question)
    for m in conv.message:
        if m["role"] == "system": continue
        if m["role"] == "assistant" and not msg: continue
        msg.append(m)
    message_id = msg[-1].get("id")
    e, dia = DialogService.get_by_id(conv.dialog_id)
    del req["id"]

    if not conv.reference:
        conv.reference = []
    conv.message.append({"role": "assistant", "content": "", "id": message_id})
    conv.reference.append({"chunks": [], "doc_aggs": []})

    def fillin_conv(ans):
        nonlocal conv, message_id
        if not conv.reference:
            conv.reference.append(ans["reference"])
        else:
            conv.reference[-1] = ans["reference"]
        conv.message[-1] = {"role": "assistant", "content": ans["answer"],
                            "id": message_id, "prompt": ans.get("prompt", "")}
        ans["id"] = message_id

    def stream():
        nonlocal dia, msg, req, conv
        try:
            for ans in chat(dia, msg, **req):
                fillin_conv(ans)
                yield "data:" + json.dumps({"retcode": 0, "retmsg": "", "data": ans}, ensure_ascii=False) + "\n\n"
            ConversationService.update_by_id(conv.id, conv.to_dict())
        except Exception as e:
            yield "data:" + json.dumps({"retcode": 500, "retmsg": str(e),
                                        "data": {"answer": "**ERROR**: " + str(e), "reference": []}},
                                       ensure_ascii=False) + "\n\n"
        yield "data:" + json.dumps({"retcode": 0, "retmsg": "", "data": True}, ensure_ascii=False) + "\n\n"

    if req.get("stream", True):
        resp = Response(stream(), mimetype="text/event-stream")
        resp.headers.add_header("Cache-control", "no-cache")
        resp.headers.add_header("Connection", "keep-alive")
        resp.headers.add_header("X-Accel-Buffering", "no")
        resp.headers.add_header("Content-Type", "text/event-stream; charset=utf-8")
        return resp

    else:
        answer = None
        for ans in chat(dia, msg, **req):
            answer = ans
            fillin_conv(ans)
            ConversationService.update_by_id(conv.id, conv.to_dict())
            break
        return get_json_result(data=answer)


@manager.route('/get', methods=['GET'])
@token_required
def get(tenant_id):
    req = request.args
    if "id" not in req:
        return get_data_error_result(retmsg="id is required")
    conv_id = req["id"]
    conv = ConversationService.query(id=conv_id)
    if not conv:
        return get_data_error_result(retmsg="Session does not exist")
    if not DialogService.query(id=conv[0].dialog_id, tenant_id=tenant_id, status=StatusEnum.VALID.value):
        return get_data_error_result(retmsg="You do not own the session")
    conv = conv[0].to_dict()
    conv['messages'] = conv.pop("message")
    conv["assistant_id"] = conv.pop("dialog_id")
    if conv["reference"]:
        messages = conv["messages"]
        message_num = 0
        chunk_num = 0
        while message_num < len(messages):
            if message_num != 0 and messages[message_num]["role"] != "user":
                chunk_list = []
                if "chunks" in conv["reference"][chunk_num]:
                    chunks = conv["reference"][chunk_num]["chunks"]
                    for chunk in chunks:
                        new_chunk = {
                            "id": chunk["chunk_id"],
                            "content": chunk["content_with_weight"],
                            "document_id": chunk["doc_id"],
                            "document_name": chunk["docnm_kwd"],
                            "knowledgebase_id": chunk["kb_id"],
                            "image_id": chunk["img_id"],
                            "similarity": chunk["similarity"],
                            "vector_similarity": chunk["vector_similarity"],
                            "term_similarity": chunk["term_similarity"],
                            "positions": chunk["positions"],
                        }
                        chunk_list.append(new_chunk)
                chunk_num += 1
                messages[message_num]["reference"] = chunk_list
            message_num += 1
    del conv["reference"]
    return get_json_result(data=conv)


@manager.route('/list', methods=["GET"])
@token_required
def list(tenant_id):
    assistant_id = request.args["assistant_id"]
    if not DialogService.query(tenant_id=tenant_id, id=assistant_id, status=StatusEnum.VALID.value):
        return get_json_result(
            data=False, retmsg=f'Only owner of the assistant is authorized for this operation.',
            retcode=RetCode.OPERATING_ERROR)
    convs = ConversationService.query(
        dialog_id=assistant_id,
        order_by=ConversationService.model.create_time,
        reverse=True)
    convs = [d.to_dict() for d in convs]
    for conv in convs:
        conv['messages'] = conv.pop("message")
        conv["assistant_id"] = conv.pop("dialog_id")
        if conv["reference"]:
            messages = conv["messages"]
            message_num = 0
            chunk_num = 0
            while message_num < len(messages):
                if message_num != 0 and messages[message_num]["role"] != "user":
                    chunk_list = []
                    if "chunks" in conv["reference"][chunk_num]:
                        chunks = conv["reference"][chunk_num]["chunks"]
                        for chunk in chunks:
                            new_chunk = {
                                "id": chunk["chunk_id"],
                                "content": chunk["content_with_weight"],
                                "document_id": chunk["doc_id"],
                                "document_name": chunk["docnm_kwd"],
                                "knowledgebase_id": chunk["kb_id"],
                                "image_id": chunk["img_id"],
                                "similarity": chunk["similarity"],
                                "vector_similarity": chunk["vector_similarity"],
                                "term_similarity": chunk["term_similarity"],
                                "positions": chunk["positions"],
                            }
                            chunk_list.append(new_chunk)
                    chunk_num += 1
                    messages[message_num]["reference"] = chunk_list
                message_num += 1
        del conv["reference"]
    return get_json_result(data=convs)


@manager.route('/delete', methods=["DELETE"])
@token_required
def delete(tenant_id):
    id = request.args.get("id")
    if not id:
        return get_data_error_result(retmsg="`id` is required in deleting operation")
    conv = ConversationService.query(id=id)
    if not conv:
        return get_data_error_result(retmsg="Session doesn't exist")
    conv = conv[0]
    if not DialogService.query(id=conv.dialog_id, tenant_id=tenant_id, status=StatusEnum.VALID.value):
        return get_data_error_result(retmsg="You don't own the session")
    ConversationService.delete_by_id(id)
    return get_json_result(data=True)