#
#  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
import logging
import time
from functools import reduce
from operator import or_
from uuid import uuid4
from agent.canvas import Canvas
from api.db import CanvasCategory, TenantPermission
from api.db.db_models import DB, CanvasTemplate, User, UserCanvas, API4Conversation, UserCanvasVersion
from api.db.services.api_service import API4ConversationService
from api.db.services.common_service import CommonService
from api.db.services.user_canvas_version import UserCanvasVersionService
from common.misc_utils import get_uuid, thread_pool_exec
from api.utils.api_utils import get_data_openai
import tiktoken
from peewee import fn


class CanvasTemplateService(CommonService):
    model = CanvasTemplate


class DataFlowTemplateService(CommonService):
    """
    Alias of CanvasTemplateService
    """

    model = CanvasTemplate


class UserCanvasService(CommonService):
    model = UserCanvas

    @classmethod
    @DB.connection_context()
    def get_list(cls, tenant_id, page_number, items_per_page, orderby, desc, id, title, canvas_category=CanvasCategory.Agent):
        agents = cls.model.select()
        if id:
            agents = agents.where(cls.model.id == id)
        if title:
            agents = agents.where(cls.model.title == title)
        agents = agents.where(cls.model.user_id == tenant_id)
        agents = agents.where(cls.model.canvas_category == canvas_category)
        if desc:
            agents = agents.order_by(cls.model.getter_by(orderby).desc())
        else:
            agents = agents.order_by(cls.model.getter_by(orderby).asc())

        agents = agents.paginate(page_number, items_per_page)

        return list(agents.dicts())

    @classmethod
    @DB.connection_context()
    def get_all_agents_by_tenant_ids(cls, tenant_ids, user_id):
        # will get all permitted agents, be cautious
        fields = [cls.model.id, cls.model.avatar, cls.model.title, cls.model.permission, cls.model.canvas_type, cls.model.canvas_category]
        # find team agents and owned agents
        agents = cls.model.select(*fields).where((cls.model.user_id.in_(tenant_ids) & (cls.model.permission == TenantPermission.TEAM.value)) | (cls.model.user_id == user_id))
        # sort by create_time, asc
        agents.order_by(cls.model.create_time.asc())
        # maybe cause slow query by deep paginate, optimize later
        offset, limit = 0, 50
        res = []
        while True:
            ag_batch = agents.offset(offset).limit(limit)
            _temp = list(ag_batch.dicts())
            if not _temp:
                break
            res.extend(_temp)
            offset += limit
        return res

    @classmethod
    @DB.connection_context()
    def get_by_canvas_id(cls, pid):
        try:
            fields = [
                cls.model.id,
                cls.model.avatar,
                cls.model.title,
                cls.model.dsl,
                cls.model.description,
                cls.model.permission,
                cls.model.update_time,
                cls.model.user_id,
                cls.model.create_time,
                cls.model.create_date,
                cls.model.update_date,
                cls.model.canvas_category,
                User.nickname,
                User.avatar.alias("tenant_avatar"),
            ]
            agents = cls.model.select(*fields).join(User, on=(cls.model.user_id == User.id)).where(cls.model.id == pid)
            # obj = cls.model.query(id=pid)[0]
            return True, agents.dicts()[0]
        except Exception as e:
            logging.exception(e)
            return False, None

    @classmethod
    @DB.connection_context()
    def get_basic_info_by_canvas_ids(cls, canvas_id):
        fields = [cls.model.id, cls.model.avatar, cls.model.user_id, cls.model.title, cls.model.permission, cls.model.canvas_category]
        return cls.model.select(*fields).where(cls.model.id.in_(canvas_id)).dicts()

    @classmethod
    @DB.connection_context()
    def get_by_tenant_ids(
        cls,
        joined_tenant_ids,
        user_id,
        page_number,
        items_per_page,
        orderby,
        desc,
        keywords,
        canvas_category=None,
        tags=None,
        canvas_type=None,
    ):
        fields = [
            cls.model.id,
            cls.model.avatar,
            cls.model.title,
            cls.model.description,
            cls.model.permission,
            cls.model.user_id.alias("tenant_id"),
            User.nickname,
            User.avatar.alias("tenant_avatar"),
            cls.model.update_time,
            cls.model.canvas_type,
            cls.model.canvas_category,
            cls.model.tags,
        ]
        if keywords:
            agents = (
                cls.model.select(*fields)
                .join(User, on=(cls.model.user_id == User.id))
                .where(
                    (((cls.model.user_id.in_(joined_tenant_ids)) & (cls.model.permission == TenantPermission.TEAM.value)) | (cls.model.user_id == user_id)),
                    (fn.LOWER(cls.model.title).contains(keywords.lower())),
                )
            )
        else:
            agents = (
                cls.model.select(*fields)
                .join(User, on=(cls.model.user_id == User.id))
                .where((((cls.model.user_id.in_(joined_tenant_ids)) & (cls.model.permission == TenantPermission.TEAM.value)) | (cls.model.user_id == user_id)))
            )
        if canvas_category:
            agents = agents.where(cls.model.canvas_category == canvas_category)
        if canvas_type:
            agents = agents.where(cls.model.canvas_type == canvas_type)
        if tags:
            tag_list = [t.strip() for t in tags if t and t.strip()] if isinstance(tags, (list, tuple)) else [t.strip() for t in str(tags).split(",") if t.strip()]
            if tag_list:
                # Wrap value with commas so 'ml' doesn't match 'ml-ops'.
                wrapped = fn.CONCAT(",", cls.model.tags, ",")
                clauses = [wrapped.contains(f",{t},") for t in tag_list]
                agents = agents.where(reduce(or_, clauses))
        if desc:
            agents = agents.order_by(cls.model.getter_by(orderby).desc())
        else:
            agents = agents.order_by(cls.model.getter_by(orderby).asc())

        count = agents.count()
        if page_number and items_per_page:
            agents = agents.paginate(page_number, items_per_page)

        agents_list = list(agents.dicts())

        # Get latest release time for each canvas
        if agents_list:
            canvas_ids = [a["id"] for a in agents_list]
            release_times = (
                UserCanvasVersion.select(UserCanvasVersion.user_canvas_id, fn.MAX(UserCanvasVersion.create_time).alias("release_time"))
                .where((UserCanvasVersion.user_canvas_id.in_(canvas_ids)) & (UserCanvasVersion.release))
                .group_by(UserCanvasVersion.user_canvas_id)
            )
            release_time_map = {r.user_canvas_id: r.release_time for r in release_times}

            for agent in agents_list:
                agent["release_time"] = release_time_map.get(agent["id"])

        return agents_list, count

    @classmethod
    @DB.connection_context()
    def list_tags(cls, joined_tenant_ids, user_id, canvas_category=None):
        """Return {tag: agent_count} aggregated across agents visible to the user."""
        query = cls.model.select(cls.model.tags).where(((cls.model.user_id.in_(joined_tenant_ids)) & (cls.model.permission == TenantPermission.TEAM.value)) | (cls.model.user_id == user_id))
        if canvas_category:
            query = query.where(cls.model.canvas_category == canvas_category)

        counts: dict[str, int] = {}
        for row in query.dicts():
            for t in (row.get("tags") or "").split(","):
                t = t.strip()
                if t:
                    counts[t] = counts.get(t, 0) + 1
        logging.info(
            "UserCanvasService.list_tags user=%s canvas_category=%s tags_count=%d",
            user_id,
            canvas_category,
            len(counts),
        )
        return counts

    # Tag storage is a single comma-separated CharField(max_length=512);
    # commas inside a tag would corrupt the encoding, so strip them on write.
    TAGS_FIELD_MAX = 512
    TAG_MAX_LEN = 64

    @classmethod
    @DB.connection_context()
    def update_tags(cls, canvas_id, tags):
        """Persist a normalized comma-separated tag string for the given canvas."""
        if isinstance(tags, (list, tuple)):
            cleaned = [str(t).replace(",", " ").strip() for t in tags if t and str(t).strip()]
        else:
            cleaned = [t.strip() for t in str(tags or "").split(",") if t.strip()]
        # Dedupe (case-insensitive, preserve order), cap individual tag length,
        # then truncate the joined value so it always fits the column.
        seen = set()
        normalized = []
        used = 0
        for t in cleaned:
            t = t[: cls.TAG_MAX_LEN]
            key = t.lower()
            if key in seen:
                continue
            extra = len(t) + (1 if normalized else 0)
            if used + extra > cls.TAGS_FIELD_MAX:
                break
            seen.add(key)
            normalized.append(t)
            used += extra
        value = ",".join(normalized)
        rows_affected = cls.model.update(tags=value).where(cls.model.id == canvas_id).execute()
        logging.info(
            "UserCanvasService.update_tags canvas_id=%s tags_count=%d rows=%d",
            canvas_id,
            len(normalized),
            rows_affected,
        )
        return rows_affected

    @classmethod
    @DB.connection_context()
    def accessible(cls, canvas_id, tenant_id):
        from api.db.services.user_service import UserTenantService

        e, c = UserCanvasService.get_by_canvas_id(canvas_id)
        if not e:
            return False

        tids = [t.tenant_id for t in UserTenantService.query(user_id=tenant_id)]
        if c["user_id"] == tenant_id:
            return True
        if c["user_id"] not in tids:
            return False
        if c["permission"] != TenantPermission.TEAM.value:
            return False
        return True

    @classmethod
    def get_agent_dsl_with_release(cls, agent_id, release_mode=False, tenant_id=None):
        e, cvs = cls.get_by_id(agent_id)
        if not e:
            raise LookupError("Agent not found.")

        if release_mode:
            released_version = UserCanvasVersionService.get_latest_released(agent_id)
            if not released_version:
                raise PermissionError("No available published version")
            dsl = released_version.dsl
        else:
            dsl = cvs.dsl

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

        return cvs, dsl


async def completion(tenant_id, agent_id, session_id=None, **kwargs):
    query = kwargs.get("query", "") or kwargs.get("question", "")
    files = kwargs.get("files", [])
    inputs = kwargs.get("inputs", {})
    user_id = kwargs.get("user_id", "")
    chat_template_kwargs = kwargs.get("chat_template_kwargs")
    custom_header = kwargs.get("custom_header", "")
    release_mode = str(kwargs.get("release", "")).strip().lower()

    if session_id:
        e, conv = await thread_pool_exec(API4ConversationService.get_by_id, session_id)
        if not e:
            raise LookupError("Session not found!")
        if not conv.message:
            conv.message = []
        if not isinstance(conv.dsl, str):
            conv.dsl = json.dumps(conv.dsl, ensure_ascii=False)
        canvas = Canvas(conv.dsl, tenant_id, task_id=session_id, canvas_id=agent_id, custom_header=custom_header)
    else:
        cvs, dsl = await thread_pool_exec(UserCanvasService.get_agent_dsl_with_release, agent_id, release_mode=release_mode == "true", tenant_id=tenant_id)

        session_id = get_uuid()
        canvas = Canvas(dsl, tenant_id, task_id=session_id, canvas_id=cvs.id, custom_header=custom_header)
        canvas.reset()
        # Get the version title based on release_mode
        version_title = await thread_pool_exec(UserCanvasVersionService.get_latest_version_title, cvs.id, release_mode=release_mode == "true")
        conv = {"id": session_id, "dialog_id": cvs.id, "user_id": user_id, "message": [], "source": "agent", "dsl": dsl, "reference": [], "version_title": version_title}
        await thread_pool_exec(API4ConversationService.save, **conv)
        conv = API4Conversation(**conv)

    message_id = str(uuid4())
    conv.message.append({"role": "user", "content": query, "id": message_id, "files": files})
    txt = ""
    run_kwargs = {
        "query": query,
        "files": files,
        "user_id": user_id,
        "inputs": inputs,
        # Forwarded to upstream LLM providers as the `user` field for session correlation.
        "session_id": session_id,
    }
    if chat_template_kwargs is not None:
        run_kwargs["chat_template_kwargs"] = chat_template_kwargs

    try:
        async for ans in canvas.run(**run_kwargs):
            ans["session_id"] = session_id
            if ans["event"] == "message":
                txt += ans["data"]["content"]
                if ans["data"].get("start_to_think", False):
                    txt += "<think>"
                elif ans["data"].get("end_to_think", False):
                    txt += "</think>"
            yield "data:" + json.dumps(ans, ensure_ascii=False) + "\n\n"
    finally:
        canvas.close()

    conv.message.append({"role": "assistant", "content": txt, "created_at": time.time(), "id": message_id})
    current_reference = canvas.get_reference()
    if not isinstance(current_reference, dict):
        current_reference = {}
    if not conv.reference:
        conv.reference = []
    if isinstance(conv.reference, dict):
        conv.reference = [conv.reference]
    conv.reference.append(current_reference)
    conv.errors = canvas.error
    conv.dsl = str(canvas)
    conv = conv.to_dict()
    await thread_pool_exec(API4ConversationService.append_message, conv["id"], conv)


async def completion_openai(tenant_id, agent_id, question, session_id=None, stream=True, **kwargs):
    tiktoken_encoder = tiktoken.get_encoding("cl100k_base")
    prompt_tokens = len(tiktoken_encoder.encode(str(question)))
    user_id = kwargs.get("user_id", "")

    if stream:
        completion_tokens = 0
        try:
            async for ans in completion(tenant_id=tenant_id, agent_id=agent_id, session_id=session_id, query=question, user_id=user_id, **kwargs):
                if isinstance(ans, str):
                    try:
                        ans = json.loads(ans[5:])  # remove "data:"
                    except Exception as e:
                        logging.exception(f"Agent OpenAI-Compatible completion_openai parse answer failed: {e}")
                        continue
                if ans.get("event") not in ["message", "message_end"]:
                    continue

                content_piece = ""
                if ans["event"] == "message":
                    content_piece = ans["data"]["content"]

                completion_tokens += len(tiktoken_encoder.encode(content_piece))

                openai_data = get_data_openai(id=session_id or str(uuid4()), model=agent_id, content=content_piece, prompt_tokens=prompt_tokens, completion_tokens=completion_tokens, stream=True)

                if ans.get("data", {}).get("reference", None):
                    openai_data["choices"][0]["delta"]["reference"] = ans["data"]["reference"]

                yield "data: " + json.dumps(openai_data, ensure_ascii=False) + "\n\n"

            yield "data: [DONE]\n\n"

        except Exception as e:
            logging.exception(e)
            yield (
                "data: "
                + json.dumps(
                    get_data_openai(
                        id=session_id or str(uuid4()),
                        model=agent_id,
                        content=f"**ERROR**: {str(e)}",
                        finish_reason="stop",
                        prompt_tokens=prompt_tokens,
                        completion_tokens=len(tiktoken_encoder.encode(f"**ERROR**: {str(e)}")),
                        stream=True,
                    ),
                    ensure_ascii=False,
                )
                + "\n\n"
            )
            yield "data: [DONE]\n\n"

    else:
        try:
            all_content = ""
            reference = {}
            async for ans in completion(tenant_id=tenant_id, agent_id=agent_id, session_id=session_id, query=question, user_id=user_id, **kwargs):
                if isinstance(ans, str):
                    ans = json.loads(ans[5:])
                if ans.get("event") not in ["message", "message_end"]:
                    continue

                if ans["event"] == "message":
                    all_content += ans["data"]["content"]

                if ans.get("data", {}).get("reference", None):
                    reference.update(ans["data"]["reference"])

            completion_tokens = len(tiktoken_encoder.encode(all_content))

            openai_data = get_data_openai(
                id=session_id or str(uuid4()), model=agent_id, prompt_tokens=prompt_tokens, completion_tokens=completion_tokens, content=all_content, finish_reason="stop", param=None
            )

            if reference:
                openai_data["choices"][0]["message"]["reference"] = reference

            yield openai_data
        except Exception as e:
            logging.exception(e)
            yield get_data_openai(
                id=session_id or str(uuid4()),
                model=agent_id,
                prompt_tokens=prompt_tokens,
                completion_tokens=len(tiktoken_encoder.encode(f"**ERROR**: {str(e)}")),
                content=f"**ERROR**: {str(e)}",
                finish_reason="stop",
                param=None,
            )
