#
#  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 re
import json
from copy import deepcopy
from uuid import uuid4
from api.db import LLMType
from flask import request, Response
from api.db.services.dialog_service import ask
from agent.canvas import Canvas
from api.db import StatusEnum
from api.db.db_models import API4Conversation
from api.db.services.api_service import API4ConversationService
from api.db.services.canvas_service import UserCanvasService
from api.db.services.dialog_service import DialogService, ConversationService, chat
from api.db.services.knowledgebase_service import KnowledgebaseService
from api.utils import get_uuid
from api.utils.api_utils import get_error_data_result
from api.utils.api_utils import get_result, token_required
from api.db.services.llm_service import LLMBundle


@manager.route('/chats/<chat_id>/sessions', methods=['POST'])
@token_required
def create(tenant_id,chat_id):
    req = request.json
    req["dialog_id"] = chat_id
    dia = DialogService.query(tenant_id=tenant_id, id=req["dialog_id"], status=StatusEnum.VALID.value)
    if not dia:
        return get_error_data_result(message="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_error_data_result(message="`name` can not be empty.")
    ConversationService.save(**conv)
    e, conv = ConversationService.get_by_id(conv["id"])
    if not e:
        return get_error_data_result(message="Fail to create a session!")
    conv = conv.to_dict()
    conv['messages'] = conv.pop("message")
    conv["chat_id"] = conv.pop("dialog_id")
    del conv["reference"]
    return get_result(data=conv)


@manager.route('/agents/<agent_id>/sessions', methods=['POST'])
@token_required
def create_agent_session(tenant_id, agent_id):
    req = request.json
    e, cvs = UserCanvasService.get_by_id(agent_id)
    if not e:
        return get_error_data_result("Agent not found.")
    if cvs.user_id != tenant_id:
        return get_error_data_result(message="You do not own the agent.")

    if not isinstance(cvs.dsl, str):
        cvs.dsl = json.dumps(cvs.dsl, ensure_ascii=False)

    canvas = Canvas(cvs.dsl, tenant_id)
    conv = {
        "id": get_uuid(),
        "dialog_id": cvs.id,
        "user_id": req.get("usr_id","") if isinstance(req, dict) else "",
        "message": [{"role": "assistant", "content": canvas.get_prologue()}],
        "source": "agent",
        "dsl":json.loads(cvs.dsl)
    }
    API4ConversationService.save(**conv)
    conv["agent_id"] = conv.pop("dialog_id")
    return get_result(data=conv)


@manager.route('/chats/<chat_id>/sessions/<session_id>', methods=['PUT'])
@token_required
def update(tenant_id,chat_id,session_id):
    req = request.json
    req["dialog_id"] = chat_id
    conv_id = session_id
    conv = ConversationService.query(id=conv_id,dialog_id=chat_id)
    if not conv:
        return get_error_data_result(message="Session does not exist")
    if not DialogService.query(id=chat_id, tenant_id=tenant_id, status=StatusEnum.VALID.value):
        return get_error_data_result(message="You do not own the session")
    if "message" in req or "messages" in req:
        return get_error_data_result(message="`message` can not be change")
    if "reference" in req:
        return get_error_data_result(message="`reference` can not be change")
    if "name" in req and not req.get("name"):
        return get_error_data_result(message="`name` can not be empty.")
    if not ConversationService.update_by_id(conv_id, req):
        return get_error_data_result(message="Session updates error")
    return get_result()


@manager.route('/chats/<chat_id>/completions', methods=['POST'])
@token_required
def completion(tenant_id, chat_id):
    req = request.json
    if not req.get("session_id"):
        conv = {
            "id": get_uuid(),
            "dialog_id": chat_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_error_data_result(message="`name` can not be empty.")
        ConversationService.save(**conv)
        e, conv = ConversationService.get_by_id(conv["id"])
        session_id=conv.id
    else:
        session_id = req.get("session_id")
    if not req.get("question"):
        return get_error_data_result(message="Please input your question.")
    conv = ConversationService.query(id=session_id,dialog_id=chat_id)
    if not conv:
        return get_error_data_result(message="Session does not exist")
    conv = conv[0]
    if not DialogService.query(id=chat_id, tenant_id=tenant_id, status=StatusEnum.VALID.value):
        return get_error_data_result(message="You do not own the chat")
    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)

    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):
        reference = ans["reference"]
        temp_reference = deepcopy(ans["reference"])
        nonlocal conv, message_id
        if not conv.reference:
            conv.reference.append(temp_reference)
        else:
            conv.reference[-1] = temp_reference
        conv.message[-1] = {"role": "assistant", "content": ans["answer"],
                            "id": message_id, "prompt": ans.get("prompt", "")}
        if "chunks" in reference:
            chunks = reference.get("chunks")
            chunk_list = []
            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"],
                    "dataset_id": chunk["kb_id"],
                    "image_id": chunk.get("image_id", ""),
                    "similarity": chunk["similarity"],
                    "vector_similarity": chunk["vector_similarity"],
                    "term_similarity": chunk["term_similarity"],
                    "positions": chunk.get("positions", []),
                }
                chunk_list.append(new_chunk)
            reference["chunks"] = chunk_list
        ans["id"] = message_id
        ans["session_id"]=session_id

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


@manager.route('/agents/<agent_id>/completions', methods=['POST'])
@token_required
def agent_completion(tenant_id, agent_id):
    req = request.json

    e, cvs = UserCanvasService.get_by_id(agent_id)
    if not e:
        return get_error_data_result("Agent not found.")
    if cvs.user_id != tenant_id:
        return get_error_data_result(message="You do not own the agent.")
    if not isinstance(cvs.dsl, str):
        cvs.dsl = json.dumps(cvs.dsl, ensure_ascii=False)
    canvas = Canvas(cvs.dsl, tenant_id)

    if not req.get("session_id"):
        session_id = get_uuid()
        conv = {
            "id": session_id,
            "dialog_id": cvs.id,
            "user_id": req.get("user_id", ""),
            "message": [{"role": "assistant", "content": canvas.get_prologue()}],
            "source": "agent",
            "dsl": json.loads(cvs.dsl)
        }
        API4ConversationService.save(**conv)
        conv = API4Conversation(**conv)
    else:
        session_id = req.get("session_id")
        e, conv = API4ConversationService.get_by_id(req["session_id"])
        if not e:
            return get_error_data_result(message="Session not found!")
        canvas = Canvas(json.dumps(conv.dsl), tenant_id)

    messages = conv.message
    question = req.get("question")
    if not question:
        return get_error_data_result("`question` is required.")
    question = {
        "role": "user",
        "content": question,
        "id": str(uuid4())
    }
    messages.append(question)
    msg = []
    for m in messages:
        if m["role"] == "system":
            continue
        if m["role"] == "assistant" and not msg:
            continue
        msg.append(m)
    if not msg[-1].get("id"): msg[-1]["id"] = get_uuid()
    message_id = msg[-1]["id"]

    stream = req.get("stream", True)

    def fillin_conv(ans):
        reference = ans["reference"]
        print(reference,flush=True)
        temp_reference = deepcopy(ans["reference"])
        nonlocal conv, message_id
        if not conv.reference:
            conv.reference.append(temp_reference)
        else:
            conv.reference[-1] = temp_reference
        conv.message[-1] = {"role": "assistant", "content": ans["answer"], "id": message_id}
        if "chunks" in reference:
            chunks = reference.get("chunks")
            chunk_list = []
            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"],
                    "dataset_id": chunk["kb_id"],
                    "image_id": chunk["image_id"],
                    "similarity": chunk["similarity"],
                    "vector_similarity": chunk["vector_similarity"],
                    "term_similarity": chunk["term_similarity"],
                    "positions": chunk["positions"],
                }
                chunk_list.append(new_chunk)
            reference["chunks"] = chunk_list
        ans["id"] = message_id
        ans["session_id"] = session_id

    def rename_field(ans):
        reference = ans['reference']
        if not isinstance(reference, dict):
            return
        for chunk_i in reference.get('chunks', []):
            if 'docnm_kwd' in chunk_i:
                chunk_i['doc_name'] = chunk_i['docnm_kwd']
                chunk_i.pop('docnm_kwd')

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

    final_ans = {"reference": [], "content": ""}

    canvas.add_user_input(msg[-1]["content"])

    if stream:
        def sse():
            nonlocal answer, cvs
            try:
                for ans in canvas.run(stream=stream):
                    if ans.get("running_status"):
                        yield "data:" + json.dumps({"code": 0, "message": "",
                                                    "data": {"answer": ans["content"],
                                                             "running_status": True}},
                                                   ensure_ascii=False) + "\n\n"
                        continue
                    for k in ans.keys():
                        final_ans[k] = ans[k]
                    ans = {"answer": ans["content"], "reference": ans.get("reference", [])}
                    fillin_conv(ans)
                    rename_field(ans)
                    yield "data:" + json.dumps({"code": 0, "message": "", "data": ans},
                                               ensure_ascii=False) + "\n\n"

                canvas.messages.append({"role": "assistant", "content": final_ans["content"], "id": message_id})
                canvas.history.append(("assistant", final_ans["content"]))
                if final_ans.get("reference"):
                    canvas.reference.append(final_ans["reference"])
                conv.dsl = json.loads(str(canvas))
                API4ConversationService.append_message(conv.id, conv.to_dict())
            except Exception as e:
                conv.dsl = json.loads(str(canvas))
                API4ConversationService.append_message(conv.id, conv.to_dict())
                yield "data:" + json.dumps({"code": 500, "message": str(e),
                                            "data": {"answer": "**ERROR**: " + str(e), "reference": []}},
                                           ensure_ascii=False) + "\n\n"
            yield "data:" + json.dumps({"code": 0, "message": "", "data": True}, ensure_ascii=False) + "\n\n"

        resp = Response(sse(), 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

    for answer in canvas.run(stream=False):
        if answer.get("running_status"): continue
        final_ans["content"] = "\n".join(answer["content"]) if "content" in answer else ""
        canvas.messages.append({"role": "assistant", "content": final_ans["content"], "id": message_id})
        if final_ans.get("reference"):
            canvas.reference.append(final_ans["reference"])
        conv.dsl = json.loads(str(canvas))

        result = {"answer": final_ans["content"], "reference": final_ans.get("reference", [])}
        fillin_conv(result)
        API4ConversationService.append_message(conv.id, conv.to_dict())
        rename_field(result)
        return get_result(data=result)

@manager.route('/chats/<chat_id>/sessions', methods=['GET'])
@token_required
def list_session(chat_id,tenant_id):
    if not DialogService.query(tenant_id=tenant_id, id=chat_id, status=StatusEnum.VALID.value):
        return get_error_data_result(message=f"You don't own the assistant {chat_id}.")
    id = request.args.get("id")
    name = request.args.get("name")
    page_number = int(request.args.get("page", 1))
    items_per_page = int(request.args.get("page_size", 30))
    orderby = request.args.get("orderby", "create_time")
    if request.args.get("desc") == "False" or request.args.get("desc") == "false":
        desc = False
    else:
        desc = True
    convs = ConversationService.get_list(chat_id,page_number,items_per_page,orderby,desc,id,name)
    if not convs:
        return get_result(data=[])
    for conv in convs:
        conv['messages'] = conv.pop("message")
        infos = conv["messages"]
        for info in infos:
            if "prompt" in info:
                info.pop("prompt")
        conv["chat_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"],
                                "dataset_id": chunk["kb_id"],
                                "image_id": chunk.get("image_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_result(data=convs)


@manager.route('/chats/<chat_id>/sessions', methods=["DELETE"])
@token_required
def delete(tenant_id,chat_id):
    if not DialogService.query(id=chat_id, tenant_id=tenant_id, status=StatusEnum.VALID.value):
        return get_error_data_result(message="You don't own the chat")
    req = request.json
    convs = ConversationService.query(dialog_id=chat_id)
    if not req:
        ids = None
    else:
        ids=req.get("ids")

    if not ids:
        conv_list = []
        for conv in convs:
            conv_list.append(conv.id)
    else:
        conv_list=ids
    for id in conv_list:
        conv = ConversationService.query(id=id,dialog_id=chat_id)
        if not conv:
            return get_error_data_result(message="The chat doesn't own the session")
        ConversationService.delete_by_id(id)
    return get_result()

@manager.route('/sessions/ask', methods=['POST'])
@token_required
def ask_about(tenant_id):
    req = request.json
    if not req.get("question"):
        return get_error_data_result("`question` is required.")
    if not req.get("dataset_ids"):
        return get_error_data_result("`dataset_ids` is required.")
    if not isinstance(req.get("dataset_ids"),list):
        return get_error_data_result("`dataset_ids` should be a list.")
    req["kb_ids"]=req.pop("dataset_ids")
    for kb_id in req["kb_ids"]:
        if not KnowledgebaseService.accessible(kb_id,tenant_id):
            return get_error_data_result(f"You don't own the dataset {kb_id}.")
        kbs = KnowledgebaseService.query(id=kb_id)
        kb = kbs[0]
        if kb.chunk_num == 0:
            return get_error_data_result(f"The dataset {kb_id} doesn't own parsed file")
    uid = tenant_id
    def stream():
        nonlocal req, uid
        try:
            for ans in ask(req["question"], req["kb_ids"], uid):
                yield "data:" + json.dumps({"code": 0, "message": "", "data": ans}, ensure_ascii=False) + "\n\n"
        except Exception as e:
            yield "data:" + json.dumps({"code": 500, "message": str(e),
                                        "data": {"answer": "**ERROR**: " + str(e), "reference": []}},
                                       ensure_ascii=False) + "\n\n"
        yield "data:" + json.dumps({"code": 0, "message": "", "data": True}, ensure_ascii=False) + "\n\n"

    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


@manager.route('/sessions/related_questions', methods=['POST'])
@token_required
def related_questions(tenant_id):
    req = request.json
    if not req.get("question"):
        return get_error_data_result("`question` is required.")
    question = req["question"]
    chat_mdl = LLMBundle(tenant_id, LLMType.CHAT)
    prompt = """
Objective: To generate search terms related to the user's search keywords, helping users find more valuable information.
Instructions:
 - Based on the keywords provided by the user, generate 5-10 related search terms.
 - Each search term should be directly or indirectly related to the keyword, guiding the user to find more valuable information.
 - Use common, general terms as much as possible, avoiding obscure words or technical jargon.
 - Keep the term length between 2-4 words, concise and clear.
 - DO NOT translate, use the language of the original keywords.

### Example:
Keywords: Chinese football
Related search terms:
1. Current status of Chinese football
2. Reform of Chinese football
3. Youth training of Chinese football
4. Chinese football in the Asian Cup
5. Chinese football in the World Cup

Reason:
 - When searching, users often only use one or two keywords, making it difficult to fully express their information needs.
 - Generating related search terms can help users dig deeper into relevant information and improve search efficiency. 
 - At the same time, related terms can also help search engines better understand user needs and return more accurate search results.

"""
    ans = chat_mdl.chat(prompt, [{"role": "user", "content": f"""
Keywords: {question}
Related search terms:
    """}], {"temperature": 0.9})
    return get_result(data=[re.sub(r"^[0-9]\. ", "", a) for a in ans.split("\n") if re.match(r"^[0-9]\. ", a)])