#
#  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 asyncio
import datetime
import json
import logging
import re
from copy import deepcopy
from typing import Tuple
from jinja2.sandbox import SandboxedEnvironment
import json_repair
from common.misc_utils import hash_str2int
from rag.nlp import rag_tokenizer
from rag.prompts.template import load_prompt
from common.constants import TAG_FLD
from common.token_utils import encoder, num_tokens_from_string

STOP_TOKEN = "<|STOP|>"
COMPLETE_TASK = "complete_task"
INPUT_UTILIZATION = 0.5


def get_value(d, k1, k2):
    return d.get(k1, d.get(k2))


def chunks_format(reference):
    if not reference or not isinstance(reference, dict):
        return []
    raw_chunks = reference.get("chunks", [])
    if not isinstance(raw_chunks, list):
        return []
    return [
        {
            "id": get_value(chunk, "chunk_id", "id"),
            "content": get_value(chunk, "content", "content_with_weight"),
            "document_id": get_value(chunk, "doc_id", "document_id"),
            "document_name": get_value(chunk, "docnm_kwd", "document_name"),
            "dataset_id": get_value(chunk, "kb_id", "dataset_id"),
            "image_id": get_value(chunk, "image_id", "img_id"),
            "positions": get_value(chunk, "positions", "position_int"),
            "url": chunk.get("url"),
            "similarity": chunk.get("similarity"),
            "vector_similarity": chunk.get("vector_similarity"),
            "term_similarity": chunk.get("term_similarity"),
            "row_id": chunk.get("row_id"),
            "doc_type": get_value(chunk, "doc_type_kwd", "doc_type"),
            "document_metadata": chunk.get("document_metadata"),
        }
        for chunk in raw_chunks
        if isinstance(chunk, dict)
    ]


def message_fit_in(msg, max_length=4000):
    def count():
        nonlocal msg
        tks_cnts = []
        for m in msg:
            tks_cnts.append({"role": m["role"], "count": num_tokens_from_string(m["content"])})
        total = 0
        for m in tks_cnts:
            total += m["count"]
        return total

    def trim_content(content, limit):
        limit = max(0, limit)
        return encoder.decode(encoder.encode(content)[:limit])

    c = count()
    if c < max_length:
        return c, msg

    msg_ = [m for m in msg if m["role"] == "system"]
    if len(msg) > 1:
        msg_.append(msg[-1])
    msg = msg_
    c = count()
    if c < max_length:
        return c, msg

    ll = num_tokens_from_string(msg_[0]["content"])
    ll2 = num_tokens_from_string(msg_[-1]["content"])
    total = ll + ll2
    if total <= 0:
        logging.debug(
            "message_fit_in degenerate token counts total=%s max_length=%s ll=%s ll2=%s preserved_roles=%s",
            total,
            max_length,
            ll,
            ll2,
            [m.get("role") for m in msg],
        )
        return 0, msg

    if len(msg) == 1:
        msg[0]["content"] = trim_content(msg[0]["content"], max_length)
        return count(), msg

    if ll / total > 0.8:
        preserved_last = min(ll2, max_length)
        msg[-1]["content"] = trim_content(msg_[-1]["content"], preserved_last)
        remaining = max(0, max_length - preserved_last)
        msg[0]["content"] = trim_content(msg_[0]["content"], remaining)
        return count(), msg

    preserved_system = min(ll, max_length)
    msg[0]["content"] = trim_content(msg_[0]["content"], preserved_system)
    remaining = max(0, max_length - preserved_system)
    msg[-1]["content"] = trim_content(msg_[-1]["content"], remaining)
    return count(), msg


def kb_prompt(kbinfos, max_tokens, hash_id=False):
    knowledges = [get_value(ck, "content", "content_with_weight") for ck in kbinfos["chunks"]]
    kwlg_len = len(knowledges)
    used_token_count = 0
    chunks_num = 0
    for i, c in enumerate(knowledges):
        if not c:
            continue
        used_token_count += num_tokens_from_string(c)
        chunks_num += 1
        if max_tokens * 0.97 < used_token_count:
            knowledges = knowledges[:i]
            logging.warning(f"Not all the retrieval into prompt: {len(knowledges)}/{kwlg_len}")
            break

    def draw_node(k, line):
        if line is not None and not isinstance(line, str):
            line = str(line)
        if not line:
            return ""
        return f"\n├── {k}: " + re.sub(r"\n+", " ", line, flags=re.DOTALL)

    knowledges = []
    for i, ck in enumerate(kbinfos["chunks"][:chunks_num]):
        cnt = "\nID: {}".format(i if not hash_id else hash_str2int(get_value(ck, "id", "chunk_id"), 500))
        cnt += draw_node("Title", get_value(ck, "docnm_kwd", "document_name"))
        cnt += draw_node("URL", ck.get('url', ''))
        meta = ck.get("document_metadata") or {}
        for k, v in meta.items():
            cnt += draw_node(k, v)
        cnt += "\n└── Content:\n"
        cnt += get_value(ck, "content", "content_with_weight")
        knowledges.append(cnt)

    return knowledges


def memory_prompt(message_list, max_tokens):
    used_token_count = 0
    content_list = []
    for message in message_list:
        current_content_tokens = num_tokens_from_string(message["content"])
        if used_token_count + current_content_tokens > max_tokens * 0.97:
            logging.warning(f"Not all the retrieval into prompt: {len(content_list)}/{len(message_list)}")
            break
        content_list.append(message["content"])
        used_token_count += current_content_tokens
    return content_list


CITATION_PROMPT_TEMPLATE = load_prompt("citation_prompt")
CITATION_PLUS_TEMPLATE = load_prompt("citation_plus")
CONTENT_TAGGING_PROMPT_TEMPLATE = load_prompt("content_tagging_prompt")
CROSS_LANGUAGES_SYS_PROMPT_TEMPLATE = load_prompt("cross_languages_sys_prompt")
CROSS_LANGUAGES_USER_PROMPT_TEMPLATE = load_prompt("cross_languages_user_prompt")
FULL_QUESTION_PROMPT_TEMPLATE = load_prompt("full_question_prompt")
KEYWORD_PROMPT_TEMPLATE = load_prompt("keyword_prompt")
QUESTION_PROMPT_TEMPLATE = load_prompt("question_prompt")
VISION_LLM_DESCRIBE_PROMPT = load_prompt("vision_llm_describe_prompt")
VISION_LLM_FIGURE_DESCRIBE_PROMPT = load_prompt("vision_llm_figure_describe_prompt")
VISION_LLM_FIGURE_DESCRIBE_PROMPT_WITH_CONTEXT = load_prompt("vision_llm_figure_describe_prompt_with_context")
STRUCTURED_OUTPUT_PROMPT = load_prompt("structured_output_prompt")

ANALYZE_TASK_SYSTEM = load_prompt("analyze_task_system")
ANALYZE_TASK_USER = load_prompt("analyze_task_user")
NEXT_STEP = load_prompt("next_step")
REFLECT = load_prompt("reflect")
SUMMARY4MEMORY = load_prompt("summary4memory")
RANK_MEMORY = load_prompt("rank_memory")
META_FILTER = load_prompt("meta_filter")
ASK_SUMMARY = load_prompt("ask_summary")

PROMPT_JINJA_ENV = SandboxedEnvironment(
    autoescape=False, trim_blocks=True, lstrip_blocks=True
)


def citation_prompt(user_defined_prompts: dict = {}) -> str:
    template = PROMPT_JINJA_ENV.from_string(user_defined_prompts.get("citation_guidelines", CITATION_PROMPT_TEMPLATE))
    return template.render()


def citation_plus(sources: str) -> str:
    template = PROMPT_JINJA_ENV.from_string(CITATION_PLUS_TEMPLATE)
    return template.render(example=citation_prompt(), sources=sources)


async def keyword_extraction(chat_mdl, content, topn=3):
    template = PROMPT_JINJA_ENV.from_string(KEYWORD_PROMPT_TEMPLATE)
    rendered_prompt = template.render(content=content, topn=topn)

    msg = [{"role": "system", "content": rendered_prompt}, {"role": "user", "content": "Output: "}]
    _, msg = message_fit_in(msg, chat_mdl.max_length)
    kwd = await chat_mdl.async_chat(rendered_prompt, msg[1:], {"temperature": 0.2})
    if isinstance(kwd, tuple):
        kwd = kwd[0]
    kwd = re.sub(r"^.*</think>", "", kwd, flags=re.DOTALL)
    if kwd.find("**ERROR**") >= 0:
        return ""
    return kwd


async def question_proposal(chat_mdl, content, topn=3):
    template = PROMPT_JINJA_ENV.from_string(QUESTION_PROMPT_TEMPLATE)
    rendered_prompt = template.render(content=content, topn=topn)

    msg = [{"role": "system", "content": rendered_prompt}, {"role": "user", "content": "Output: "}]
    _, msg = message_fit_in(msg, chat_mdl.max_length)
    kwd = await chat_mdl.async_chat(rendered_prompt, msg[1:], {"temperature": 0.2})
    if isinstance(kwd, tuple):
        kwd = kwd[0]
    kwd = re.sub(r"^.*</think>", "", kwd, flags=re.DOTALL)
    if kwd.find("**ERROR**") >= 0:
        return ""
    return kwd


async def full_question(tenant_id=None, llm_id=None, messages=[], language=None, chat_mdl=None):
    from common.constants import LLMType
    from api.db.services.llm_service import LLMBundle
    from api.db.services.tenant_llm_service import TenantLLMService
    from api.db.joint_services.tenant_model_service import get_model_config_by_type_and_name

    if not chat_mdl:
        if TenantLLMService.llm_id2llm_type(llm_id) == "image2text":
            chat_model_config = get_model_config_by_type_and_name(tenant_id, LLMType.IMAGE2TEXT, llm_id)
        else:
            chat_model_config = get_model_config_by_type_and_name(tenant_id, LLMType.CHAT, llm_id)
        chat_mdl = LLMBundle(tenant_id, chat_model_config)
    conv = []
    for m in messages:
        if m["role"] not in ["user", "assistant"]:
            continue
        conv.append("{}: {}".format(m["role"].upper(), m["content"]))
    conversation = "\n".join(conv)
    today = datetime.date.today().isoformat()
    yesterday = (datetime.date.today() - datetime.timedelta(days=1)).isoformat()
    tomorrow = (datetime.date.today() + datetime.timedelta(days=1)).isoformat()

    template = PROMPT_JINJA_ENV.from_string(FULL_QUESTION_PROMPT_TEMPLATE)
    rendered_prompt = template.render(
        today=today,
        yesterday=yesterday,
        tomorrow=tomorrow,
        conversation=conversation,
        language=language,
    )

    ans = await chat_mdl.async_chat(rendered_prompt, [{"role": "user", "content": "Output: "}])
    ans = re.sub(r"^.*</think>", "", ans, flags=re.DOTALL)
    return ans if ans.find("**ERROR**") < 0 else messages[-1]["content"]


async def cross_languages(tenant_id, llm_id, query, languages=[]):
    from common.constants import LLMType
    from api.db.services.llm_service import LLMBundle
    from api.db.services.tenant_llm_service import TenantLLMService
    from api.db.joint_services.tenant_model_service import get_model_config_by_type_and_name, get_tenant_default_model_by_type

    if llm_id and TenantLLMService.llm_id2llm_type(llm_id) == "image2text":
        chat_model_config = get_model_config_by_type_and_name(tenant_id, LLMType.IMAGE2TEXT, llm_id)
    else:
        if not llm_id:
            chat_model_config = get_tenant_default_model_by_type(tenant_id, LLMType.CHAT)
        else:
            chat_model_config = get_model_config_by_type_and_name(tenant_id, LLMType.CHAT, llm_id)
    chat_mdl = LLMBundle(tenant_id, chat_model_config)
    rendered_sys_prompt = PROMPT_JINJA_ENV.from_string(CROSS_LANGUAGES_SYS_PROMPT_TEMPLATE).render()
    rendered_user_prompt = PROMPT_JINJA_ENV.from_string(CROSS_LANGUAGES_USER_PROMPT_TEMPLATE).render(query=query,
                                                                                                     languages=languages)

    ans = await chat_mdl.async_chat(rendered_sys_prompt, [{"role": "user", "content": rendered_user_prompt}],
                                    {"temperature": 0.2})
    ans = re.sub(r"^.*</think>", "", ans, flags=re.DOTALL)
    if ans.find("**ERROR**") >= 0:
        return query
    return "\n".join([a for a in re.sub(r"(^Output:|\n+)", "", ans, flags=re.DOTALL).split("===") if a.strip()])


async def content_tagging(chat_mdl, content, all_tags, examples, topn=3):
    template = PROMPT_JINJA_ENV.from_string(CONTENT_TAGGING_PROMPT_TEMPLATE)

    for ex in examples:
        ex["tags_json"] = json.dumps(ex[TAG_FLD], indent=2, ensure_ascii=False)

    rendered_prompt = template.render(
        topn=topn,
        all_tags=all_tags,
        examples=examples,
        content=content,
    )

    msg = [{"role": "system", "content": rendered_prompt}, {"role": "user", "content": "Output: "}]
    _, msg = message_fit_in(msg, chat_mdl.max_length)
    kwd = await chat_mdl.async_chat(rendered_prompt, msg[1:], {"temperature": 0.5})
    if isinstance(kwd, tuple):
        kwd = kwd[0]
    kwd = re.sub(r"^.*</think>", "", kwd, flags=re.DOTALL)
    if kwd.find("**ERROR**") >= 0:
        raise Exception(kwd)

    try:
        obj = json_repair.loads(kwd)
    except json_repair.JSONDecodeError:
        try:
            result = kwd.replace(rendered_prompt[:-1], "").replace("user", "").replace("model", "").strip()
            result = "{" + result.split("{")[1].split("}")[0] + "}"
            obj = json_repair.loads(result)
        except Exception as e:
            logging.exception(f"JSON parsing error: {result} -> {e}")
            raise e
    res = {}
    for k, v in obj.items():
        try:
            if int(v) > 0:
                res[str(k)] = int(v)
        except Exception:
            pass
    return res


def vision_llm_describe_prompt(page=None) -> str:
    template = PROMPT_JINJA_ENV.from_string(VISION_LLM_DESCRIBE_PROMPT)

    return template.render(page=page)


def vision_llm_figure_describe_prompt() -> str:
    template = PROMPT_JINJA_ENV.from_string(VISION_LLM_FIGURE_DESCRIBE_PROMPT)
    return template.render()


def vision_llm_figure_describe_prompt_with_context(context_above: str, context_below: str) -> str:
    template = PROMPT_JINJA_ENV.from_string(VISION_LLM_FIGURE_DESCRIBE_PROMPT_WITH_CONTEXT)
    return template.render(context_above=context_above, context_below=context_below)


def tool_schema(tools_description: list[dict], complete_task=False):
    if not tools_description:
        return ""
    desc = {}
    if complete_task:
        desc[COMPLETE_TASK] = {
            "type": "function",
            "function": {
                "name": COMPLETE_TASK,
                "description": "When you have the final answer and are ready to complete the task, call this function with your answer",
                "parameters": {
                    "type": "object",
                    "properties": {
                        "answer": {"type": "string", "description": "The final answer to the user's question"}},
                    "required": ["answer"]
                }
            }
        }
    for idx, tool in enumerate(tools_description):
        name = tool["function"]["name"]
        desc[name] = tool

    return "\n\n".join([f"## {i + 1}. {fnm}\n{json.dumps(des, ensure_ascii=False, indent=4)}" for i, (fnm, des) in
                        enumerate(desc.items())])


def form_history(history, limit=-6):
    context = ""
    for h in history[limit:]:
        if h["role"] == "system":
            continue
        role = "USER"
        if h["role"].upper() != role:
            role = "AGENT"
        context += f"\n{role}: {h['content'][:2048] + ('...' if len(h['content']) > 2048 else '')}"
    return context


async def analyze_task_async(chat_mdl, prompt, task_name, tools_description: list[dict],
                             user_defined_prompts: dict = {}):
    tools_desc = tool_schema(tools_description)
    context = ""

    if user_defined_prompts.get("task_analysis"):
        template = PROMPT_JINJA_ENV.from_string(user_defined_prompts["task_analysis"])
    else:
        template = PROMPT_JINJA_ENV.from_string(ANALYZE_TASK_SYSTEM + "\n\n" + ANALYZE_TASK_USER)
    context = template.render(task=task_name, context=context, agent_prompt=prompt, tools_desc=tools_desc)
    kwd = await chat_mdl.async_chat(context, [{"role": "user", "content": "Please analyze it."}])
    if isinstance(kwd, tuple):
        kwd = kwd[0]
    kwd = re.sub(r"^.*</think>", "", kwd, flags=re.DOTALL)
    if kwd.find("**ERROR**") >= 0:
        return ""
    return kwd


async def next_step_async(chat_mdl, history: list, tools_description: list[dict], task_desc,
                          user_defined_prompts: dict = {}):
    if not tools_description:
        return "", 0
    desc = tool_schema(tools_description)
    template = PROMPT_JINJA_ENV.from_string(user_defined_prompts.get("plan_generation", NEXT_STEP))
    user_prompt = "\nWhat's the next tool to call? If ready OR IMPOSSIBLE TO BE READY, then call `complete_task`."
    hist = deepcopy(history)
    if hist[-1]["role"] == "user":
        hist[-1]["content"] += user_prompt
    else:
        hist.append({"role": "user", "content": user_prompt})
    json_str = await chat_mdl.async_chat(
        template.render(task_analysis=task_desc, desc=desc, today=datetime.datetime.now().strftime("%Y-%m-%d")),
        hist[1:],
        stop=["<|stop|>"],
    )
    tk_cnt = num_tokens_from_string(json_str)
    json_str = re.sub(r"^.*</think>", "", json_str, flags=re.DOTALL)
    return json_str, tk_cnt


async def reflect_async(chat_mdl, history: list[dict], tool_call_res: list[Tuple], user_defined_prompts: dict = {}):
    tool_calls = [{"name": p[0], "result": p[1]} for p in tool_call_res]
    goal = history[1]["content"]
    template = PROMPT_JINJA_ENV.from_string(user_defined_prompts.get("reflection", REFLECT))
    user_prompt = template.render(goal=goal, tool_calls=tool_calls)
    hist = deepcopy(history)
    if hist[-1]["role"] == "user":
        hist[-1]["content"] += user_prompt
    else:
        hist.append({"role": "user", "content": user_prompt})
    _, msg = message_fit_in(hist, chat_mdl.max_length)
    ans = await chat_mdl.async_chat(msg[0]["content"], msg[1:])
    ans = re.sub(r"^.*</think>", "", ans, flags=re.DOTALL)
    return """
**Observation**
{}

**Reflection**
{}
    """.format(json.dumps(tool_calls, ensure_ascii=False, indent=2), ans)


def form_message(system_prompt, user_prompt):
    return [{"role": "system", "content": system_prompt}, {"role": "user", "content": user_prompt}]


def structured_output_prompt(schema=None) -> str:
    template = PROMPT_JINJA_ENV.from_string(STRUCTURED_OUTPUT_PROMPT)
    return template.render(schema=schema)


async def tool_call_summary(chat_mdl, name: str, params: dict, result: str, user_defined_prompts: dict = {}) -> str:
    template = PROMPT_JINJA_ENV.from_string(SUMMARY4MEMORY)
    system_prompt = template.render(name=name,
                                    params=json.dumps(params, ensure_ascii=False, indent=2),
                                    result=result)
    user_prompt = "→ Summary: "
    _, msg = message_fit_in(form_message(system_prompt, user_prompt), chat_mdl.max_length)
    ans = await chat_mdl.async_chat(msg[0]["content"], msg[1:])
    return re.sub(r"^.*</think>", "", ans, flags=re.DOTALL)


async def rank_memories_async(chat_mdl, goal: str, sub_goal: str, tool_call_summaries: list[str],
                              user_defined_prompts: dict = {}):
    template = PROMPT_JINJA_ENV.from_string(RANK_MEMORY)
    system_prompt = template.render(goal=goal, sub_goal=sub_goal,
                                    results=[{"i": i, "content": s} for i, s in enumerate(tool_call_summaries)])
    user_prompt = " → rank: "
    _, msg = message_fit_in(form_message(system_prompt, user_prompt), chat_mdl.max_length)
    ans = await chat_mdl.async_chat(msg[0]["content"], msg[1:], stop="<|stop|>")
    return re.sub(r"^.*</think>", "", ans, flags=re.DOTALL)


async def gen_meta_filter(chat_mdl, meta_data: dict, query: str, constraints: dict = None) -> dict:
    """Generate metadata filter conditions from a user query using an LLM.

    Args:
        chat_mdl: LLM bundle for generating filters
        meta_data: Dict of {key: set of values} - e.g. {"character": {"Caocao", "Liubei"}, "year": {2026}}
        query: User question (e.g. "Caocao in 2026")
        constraints: Optional dict of {key: operator} to constrain which op to use for a key

    Returns:
        Dict with "logic" ("and"/"or") and "conditions" list.
        Example return value:
            {
                "logic": "and",
                "conditions": [
                    {"key": "year", "value": "2026", "op": "="},
                    {"key": "character", "value": "Caocao", "op": "="}
                ]
            }

    The LLM is prompted with the available metadata keys and values, and is asked to
    generate filter conditions that match the user's query semantics.
    """
    meta_data_structure = {}
    for key, values in meta_data.items():
        meta_data_structure[key] = list(values.keys()) if isinstance(values, dict) else values

    sys_prompt = PROMPT_JINJA_ENV.from_string(META_FILTER).render(
        current_date=datetime.datetime.today().strftime('%Y-%m-%d'),
        metadata_keys=json.dumps(meta_data_structure),
        user_question=query,
        constraints=json.dumps(constraints) if constraints else None
    )
    user_prompt = "Generate filters:"
    ans = await chat_mdl.async_chat(sys_prompt, [{"role": "user", "content": user_prompt}])
    ans = re.sub(r"(^.*</think>|```json\n|```\n*$)", "", ans, flags=re.DOTALL)
    try:
        ans = json_repair.loads(ans)
        assert isinstance(ans, dict), ans
        assert "conditions" in ans and isinstance(ans["conditions"], list), ans
        return ans
    except Exception:
        logging.exception(f"Loading json failure: {ans}")

    return {"conditions": []}


async def gen_json(system_prompt: str, user_prompt: str, chat_mdl, gen_conf={}, max_retry=2):
    from rag.graphrag.utils import get_llm_cache, set_llm_cache
    cached = get_llm_cache(chat_mdl.llm_name, system_prompt, user_prompt, gen_conf)
    if cached:
        return json_repair.loads(cached)
    _, msg = message_fit_in(form_message(system_prompt, user_prompt), chat_mdl.max_length)
    err = ""
    ans = ""
    for _ in range(max_retry):
        if ans and err:
            msg[-1]["content"] += f"\nGenerated JSON is as following:\n{ans}\nBut exception while loading:\n{err}\nPlease reconsider and correct it."
        ans = await chat_mdl.async_chat(msg[0]["content"], msg[1:], gen_conf=gen_conf)
        ans = re.sub(r"(^.*</think>|```json\n|```\n*$)", "", ans, flags=re.DOTALL)
        try:
            res = json_repair.loads(ans)
            set_llm_cache(chat_mdl.llm_name, system_prompt, ans, user_prompt, gen_conf)
            return res
        except Exception as e:
            logging.exception(f"Loading json failure: {ans}")
            err += str(e)


TOC_DETECTION = load_prompt("toc_detection")


async def detect_table_of_contents(page_1024: list[str], chat_mdl):
    toc_secs = []
    for i, sec in enumerate(page_1024[:22]):
        ans = await gen_json(PROMPT_JINJA_ENV.from_string(TOC_DETECTION).render(page_txt=sec), "Only JSON please.",
                             chat_mdl)
        if toc_secs and not ans["exists"]:
            break
        toc_secs.append(sec)
    return toc_secs


TOC_EXTRACTION = load_prompt("toc_extraction")
TOC_EXTRACTION_CONTINUE = load_prompt("toc_extraction_continue")


async def extract_table_of_contents(toc_pages, chat_mdl):
    if not toc_pages:
        return []

    return await gen_json(PROMPT_JINJA_ENV.from_string(TOC_EXTRACTION).render(toc_page="\n".join(toc_pages)),
                          "Only JSON please.", chat_mdl)


async def toc_index_extractor(toc: list[dict], content: str, chat_mdl):
    tob_extractor_prompt = """
    You are given a table of contents in a json format and several pages of a document, your job is to add the physical_index to the table of contents in the json format.

    The provided pages contains tags like <physical_index_X> and <physical_index_X> to indicate the physical location of the page X.

    The structure variable is the numeric system which represents the index of the hierarchy section in the table of contents. For example, the first section has structure index 1, the first subsection has structure index 1.1, the second subsection has structure index 1.2, etc.

    The response should be in the following JSON format:
    [
        {
            "structure": <structure index, "x.x.x" or None> (string),
            "title": <title of the section>,
            "physical_index": "<physical_index_X>" (keep the format)
        },
        ...
    ]

    Only add the physical_index to the sections that are in the provided pages.
    If the title of the section are not in the provided pages, do not add the physical_index to it.
    Directly return the final JSON structure. Do not output anything else."""

    prompt = tob_extractor_prompt + '\nTable of contents:\n' + json.dumps(toc, ensure_ascii=False,
                                                                          indent=2) + '\nDocument pages:\n' + content
    return await gen_json(prompt, "Only JSON please.", chat_mdl)


TOC_INDEX = load_prompt("toc_index")


async def table_of_contents_index(toc_arr: list[dict], sections: list[str], chat_mdl):
    if not toc_arr or not sections:
        return []

    toc_map = {}
    for i, it in enumerate(toc_arr):
        k1 = (it["structure"] + it["title"]).replace(" ", "")
        k2 = it["title"].strip()
        if k1 not in toc_map:
            toc_map[k1] = []
        if k2 not in toc_map:
            toc_map[k2] = []
        toc_map[k1].append(i)
        toc_map[k2].append(i)

    for it in toc_arr:
        it["indices"] = []
    for i, sec in enumerate(sections):
        sec = sec.strip()
        if sec.replace(" ", "") in toc_map:
            for j in toc_map[sec.replace(" ", "")]:
                toc_arr[j]["indices"].append(i)

    all_pathes = []

    def dfs(start, path):
        nonlocal all_pathes
        if start >= len(toc_arr):
            if path:
                all_pathes.append(path)
            return
        if not toc_arr[start]["indices"]:
            dfs(start + 1, path)
            return
        added = False
        for j in toc_arr[start]["indices"]:
            if path and j < path[-1][0]:
                continue
            _path = deepcopy(path)
            _path.append((j, start))
            added = True
            dfs(start + 1, _path)
        if not added and path:
            all_pathes.append(path)

    dfs(0, [])
    path = max(all_pathes, key=lambda x: len(x))
    for it in toc_arr:
        it["indices"] = []
    for j, i in path:
        toc_arr[i]["indices"] = [j]
    print(json.dumps(toc_arr, ensure_ascii=False, indent=2))

    i = 0
    while i < len(toc_arr):
        it = toc_arr[i]
        if it["indices"]:
            i += 1
            continue

        if i > 0 and toc_arr[i - 1]["indices"]:
            st_i = toc_arr[i - 1]["indices"][-1]
        else:
            st_i = 0
        e = i + 1
        while e < len(toc_arr) and not toc_arr[e]["indices"]:
            e += 1
        if e >= len(toc_arr):
            e = len(sections)
        else:
            e = toc_arr[e]["indices"][0]

        for j in range(st_i, min(e + 1, len(sections))):
            ans = await gen_json(PROMPT_JINJA_ENV.from_string(TOC_INDEX).render(
                structure=it["structure"],
                title=it["title"],
                text=sections[j]), "Only JSON please.", chat_mdl)
            if ans["exist"] == "yes":
                it["indices"].append(j)
                break

        i += 1

    return toc_arr


async def check_if_toc_transformation_is_complete(content, toc, chat_mdl):
    prompt = """
    You are given a raw table of contents and a  table of contents.
    Your job is to check if the  table of contents is complete.

    Reply format:
    {{
        "thinking": <why do you think the cleaned table of contents is complete or not>
        "completed": "yes" or "no"
    }}
    Directly return the final JSON structure. Do not output anything else."""

    prompt = prompt + '\n Raw Table of contents:\n' + content + '\n Cleaned Table of contents:\n' + toc
    response = await gen_json(prompt, "Only JSON please.", chat_mdl)
    return response['completed']


async def toc_transformer(toc_pages, chat_mdl):
    init_prompt = """
    You are given a table of contents, You job is to transform the whole table of content into a JSON format included table_of_contents.

    The `structure` is the numeric system which represents the index of the hierarchy section in the table of contents. For example, the first section has structure index 1, the first subsection has structure index 1.1, the second subsection has structure index 1.2, etc.
    The `title` is a short phrase or a several-words term.

    The response should be in the following JSON format:
    [
        {
            "structure": <structure index, "x.x.x" or None> (string),
            "title": <title of the section>
        },
        ...
    ],
    You should transform the full table of contents in one go.
    Directly return the final JSON structure, do not output anything else. """

    toc_content = "\n".join(toc_pages)
    prompt = init_prompt + '\n Given table of contents\n:' + toc_content

    def clean_toc(arr):
        for a in arr:
            a["title"] = re.sub(r"[.·….]{2,}", "", a["title"])

    last_complete = await gen_json(prompt, "Only JSON please.", chat_mdl)
    if_complete = await check_if_toc_transformation_is_complete(toc_content,
                                                                json.dumps(last_complete, ensure_ascii=False, indent=2),
                                                                chat_mdl)
    clean_toc(last_complete)
    if if_complete == "yes":
        return last_complete

    while not (if_complete == "yes"):
        prompt = f"""
        Your task is to continue the table of contents json structure, directly output the remaining part of the json structure.
        The response should be in the following JSON format:

        The raw table of contents json structure is:
        {toc_content}

        The incomplete transformed table of contents json structure is:
        {json.dumps(last_complete[-24:], ensure_ascii=False, indent=2)}

        Please continue the json structure, directly output the remaining part of the json structure."""
        new_complete = await gen_json(prompt, "Only JSON please.", chat_mdl)
        if not new_complete or str(last_complete).find(str(new_complete)) >= 0:
            break
        clean_toc(new_complete)
        last_complete.extend(new_complete)
        if_complete = await check_if_toc_transformation_is_complete(toc_content,
                                                                    json.dumps(last_complete, ensure_ascii=False,
                                                                               indent=2), chat_mdl)

    return last_complete


TOC_LEVELS = load_prompt("assign_toc_levels")


async def assign_toc_levels(toc_secs, chat_mdl, gen_conf={"temperature": 0.2}):
    if not toc_secs:
        return []
    return await gen_json(
        PROMPT_JINJA_ENV.from_string(TOC_LEVELS).render(),
        str(toc_secs),
        chat_mdl,
        gen_conf
    )


TOC_FROM_TEXT_SYSTEM = load_prompt("toc_from_text_system")
TOC_FROM_TEXT_USER = load_prompt("toc_from_text_user")


# Generate TOC from text chunks with text llms
async def gen_toc_from_text(txt_info: dict, chat_mdl, callback=None):
    if callback:
        callback(msg="")
    try:
        ans = await gen_json(
            PROMPT_JINJA_ENV.from_string(TOC_FROM_TEXT_SYSTEM).render(),
            PROMPT_JINJA_ENV.from_string(TOC_FROM_TEXT_USER).render(
                text="\n".join([json.dumps(d, ensure_ascii=False) for d in txt_info["chunks"]])),
            chat_mdl,
            gen_conf={"temperature": 0.0, "top_p": 0.9}
        )
        txt_info["toc"] = ans if ans and not isinstance(ans, str) else []
    except Exception as e:
        logging.exception(e)


def split_chunks(chunks, max_length: int):
    """
    Pack chunks into batches according to max_length, returning [{"id": idx, "text": chunk_text}, ...].
    Do not split a single chunk, even if it exceeds max_length.
    """

    result = []
    batch, batch_tokens = [], 0

    for idx, chunk in enumerate(chunks):
        t = num_tokens_from_string(chunk)
        if batch_tokens + t > max_length:
            result.append(batch)
            batch, batch_tokens = [], 0
        batch.append({idx: chunk})
        batch_tokens += t
    if batch:
        result.append(batch)
    return result


async def run_toc_from_text(chunks, chat_mdl, callback=None):
    input_budget = int(chat_mdl.max_length * INPUT_UTILIZATION) - num_tokens_from_string(
        TOC_FROM_TEXT_USER + TOC_FROM_TEXT_SYSTEM
    )

    input_budget = 1024 if input_budget > 1024 else input_budget
    chunk_sections = split_chunks(chunks, input_budget)
    titles = []

    chunks_res = []
    tasks = []
    for i, chunk in enumerate(chunk_sections):
        if not chunk:
            continue
        chunks_res.append({"chunks": chunk})
        tasks.append(asyncio.create_task(gen_toc_from_text(chunks_res[-1], chat_mdl, callback)))
    try:
        await asyncio.gather(*tasks, return_exceptions=False)
    except Exception as e:
        logging.error(f"Error generating TOC: {e}")
        for t in tasks:
            t.cancel()
        await asyncio.gather(*tasks, return_exceptions=True)
        raise

    for chunk in chunks_res:
        titles.extend(chunk.get("toc", []))

    # Filter out entries with title == -1
    prune = len(titles) > 512
    max_len = 12 if prune else 22
    filtered = []
    for x in titles:
        if not isinstance(x, dict) or not x.get("title") or x["title"] == "-1":
            continue
        if len(rag_tokenizer.tokenize(x["title"]).split(" ")) > max_len:
            continue
        if re.match(r"[0-9,.()/ -]+$", x["title"]):
            continue
        filtered.append(x)

    logging.info(f"\n\nFiltered TOC sections:\n{filtered}")
    if not filtered:
        return []

    # Generate initial level (level/title)
    raw_structure = [x.get("title", "") for x in filtered]

    # Assign hierarchy levels using LLM
    toc_with_levels = await assign_toc_levels(raw_structure, chat_mdl, {"temperature": 0.0, "top_p": 0.9})
    if not toc_with_levels:
        return []

    # Merge structure and content (by index)
    prune = len(toc_with_levels) > 512
    max_lvl = "0"
    sorted_list = sorted([t.get("level", "0") for t in toc_with_levels if isinstance(t, dict)])
    if sorted_list:
        max_lvl = sorted_list[-1]
    merged = []
    for _, (toc_item, src_item) in enumerate(zip(toc_with_levels, filtered)):
        if prune and toc_item.get("level", "0") >= max_lvl:
            continue
        merged.append({
            "level": toc_item.get("level", "0"),
            "title": toc_item.get("title", ""),
            "chunk_id": src_item.get("chunk_id", ""),
        })

    return merged


TOC_RELEVANCE_SYSTEM = load_prompt("toc_relevance_system")
TOC_RELEVANCE_USER = load_prompt("toc_relevance_user")
async def relevant_chunks_with_toc(query: str, toc: list[dict], chat_mdl, topn: int = 6):
    import numpy as np
    try:
        ans = await gen_json(
            PROMPT_JINJA_ENV.from_string(TOC_RELEVANCE_SYSTEM).render(),
            PROMPT_JINJA_ENV.from_string(TOC_RELEVANCE_USER).render(query=query, toc_json="[\n%s\n]\n" % "\n".join(
                [json.dumps({"level": d["level"], "title": d["title"]}, ensure_ascii=False) for d in toc])),
            chat_mdl,
            gen_conf={"temperature": 0.0, "top_p": 0.9}
        )
        id2score = {}
        for ti, sc in zip(toc, ans):
            if not isinstance(sc, dict) or sc.get("score", -1) < 1:
                continue
            for id in ti.get("ids", []):
                if id not in id2score:
                    id2score[id] = []
                id2score[id].append(sc["score"] / 5.)
        for id in id2score.keys():
            id2score[id] = np.mean(id2score[id])
        return [(id, sc) for id, sc in list(id2score.items()) if sc >= 0.3][:topn]
    except Exception as e:
        logging.exception(e)
    return []


META_DATA = load_prompt("meta_data")
async def gen_metadata(chat_mdl, schema: dict, content: str):
    template = PROMPT_JINJA_ENV.from_string(META_DATA)
    for k, desc in schema["properties"].items():
        if "enum" in desc and not desc.get("enum"):
            del desc["enum"]
        if desc.get("enum"):
            desc["description"] += "\n** Extracted values must strictly match the given list specified by `enum`. **"
    system_prompt = template.render(content=content, schema=schema)
    user_prompt = "Output: "
    _, msg = message_fit_in(form_message(system_prompt, user_prompt), chat_mdl.max_length)
    ans = await chat_mdl.async_chat(msg[0]["content"], msg[1:])
    return re.sub(r"^.*</think>", "", ans, flags=re.DOTALL)


SUFFICIENCY_CHECK = load_prompt("sufficiency_check")
async def sufficiency_check(chat_mdl, question: str, ret_content: str):
    try:
        return await gen_json(
            PROMPT_JINJA_ENV.from_string(SUFFICIENCY_CHECK).render(question=question, retrieved_docs=ret_content),
            "Output:\n",
            chat_mdl
        )
    except Exception as e:
        logging.exception(e)
    return {}


MULTI_QUERIES_GEN = load_prompt("multi_queries_gen")
async def multi_queries_gen(chat_mdl, question: str, query:str, missing_infos:list[str], ret_content: str):
    try:
        return await gen_json(
            PROMPT_JINJA_ENV.from_string(MULTI_QUERIES_GEN).render(
                original_question=question,
                original_query=query,
                missing_info="\n - ".join(missing_infos),
                retrieved_docs=ret_content
            ),
            "Output:\n",
            chat_mdl
        )
    except Exception as e:
        logging.exception(e)
    return {}
