#
#  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 functools import partial
from uuid import uuid4

from flask import request, Response

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.utils import get_uuid
from api.utils.api_utils import get_error_data_result
from api.utils.api_utils import get_result, token_required


@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",""),
        "message": [{"role": "assistant", "content": canvas.get_prologue()}],
        "source": "agent"
    }
    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"]
        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["img_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
        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
        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"
        }
        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!")

    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"]

    if "quote" not in req: req["quote"] = False
    stream = req.get("stream", True)

    def fillin_conv(ans):
        reference = ans["reference"]
        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["img_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
        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}
        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')
    conv.message.append(msg[-1])

    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.messages.append(msg[-1])
    canvas.add_user_input(msg[-1]["content"])
    answer = canvas.run(stream=stream)

    assert answer is not None, "Nothing. Is it over?"

    if stream:
        assert isinstance(answer, partial), "Nothing. Is it over?"

        def sse():
            nonlocal answer, cvs, conv
            try:
                for ans in answer():
                    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})
                if final_ans.get("reference"):
                    canvas.reference.append(final_ans["reference"])
                cvs.dsl = json.loads(str(canvas))
                API4ConversationService.append_message(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, "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

    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"])
    cvs.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(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"] = 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["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_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()