#
#  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 datetime
import json
import logging
import re
from copy import deepcopy
from typing import Tuple
import jinja2
import json_repair
import trio
from api.utils import hash_str2int
from rag.nlp import rag_tokenizer
from rag.prompts.template import load_prompt
from rag.settings import TAG_FLD
from rag.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):

    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"),
            "doc_type": chunk.get("doc_type_kwd"),
        }
        for chunk in reference.get("chunks", [])
    ]


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

    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"])
    if ll / (ll + ll2) > 0.8:
        m = msg_[0]["content"]
        m = encoder.decode(encoder.encode(m)[: max_length - ll2])
        msg[0]["content"] = m
        return max_length, msg

    m = msg_[-1]["content"]
    m = encoder.decode(encoder.encode(m)[: max_length - ll2])
    msg[-1]["content"] = m
    return max_length, msg


def kb_prompt(kbinfos, max_tokens, hash_id=False):
    from api.db.services.document_service import DocumentService

    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

    docs = DocumentService.get_by_ids([get_value(ck, "doc_id", "document_id") for ck in kbinfos["chunks"][:chunks_num]])
    docs = {d.id: d.meta_fields for d in docs}

    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['url'])  if "url" in ck else ""
        for k, v in docs.get(get_value(ck, "doc_id", "document_id"), {}).items():
            cnt += draw_node(k, v)
        cnt += "\n└── Content:\n"
        cnt += get_value(ck, "content", "content_with_weight")
        knowledges.append(cnt)

    return knowledges


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")

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 = jinja2.Environment(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)


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 = chat_mdl.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


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 = chat_mdl.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


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

    if not chat_mdl:
        if TenantLLMService.llm_id2llm_type(llm_id) == "image2text":
            chat_mdl = LLMBundle(tenant_id, LLMType.IMAGE2TEXT, llm_id)
        else:
            chat_mdl = LLMBundle(tenant_id, LLMType.CHAT, llm_id)
    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 = chat_mdl.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"]


def cross_languages(tenant_id, llm_id, query, languages=[]):
    from api.db import LLMType
    from api.db.services.llm_service import LLMBundle
    from api.db.services.tenant_llm_service import TenantLLMService

    if llm_id and TenantLLMService.llm_id2llm_type(llm_id) == "image2text":
        chat_mdl = LLMBundle(tenant_id, LLMType.IMAGE2TEXT, llm_id)
    else:
        chat_mdl = LLMBundle(tenant_id, LLMType.CHAT, llm_id)

    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 = chat_mdl.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()])


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 = chat_mdl.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 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 tool in tools_description:
        desc[tool["function"]["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


def analyze_task(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 = chat_mdl.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


def next_step(chat_mdl, history:list, tools_description: list[dict], task_desc, user_defined_prompts: dict={}):
    if not tools_description:
        return ""
    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 = chat_mdl.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


def reflect(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 = chat_mdl.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 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 = chat_mdl.chat(msg[0]["content"], msg[1:])
    return re.sub(r"^.*</think>", "", ans, flags=re.DOTALL)


def rank_memories(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 = chat_mdl.chat(msg[0]["content"], msg[1:], stop="<|stop|>")
    return re.sub(r"^.*</think>", "", ans, flags=re.DOTALL)


def gen_meta_filter(chat_mdl, meta_data:dict, query: str) -> list:
    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),
        user_question=query
    )
    user_prompt = "Generate filters:"
    ans = chat_mdl.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, list), ans
        return ans
    except Exception:
        logging.exception(f"Loading json failure: {ans}")
    return []


def gen_json(system_prompt:str, user_prompt:str, chat_mdl, gen_conf = None):
    from 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)
    ans = chat_mdl.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:
        logging.exception(f"Loading json failure: {ans}")


TOC_DETECTION = load_prompt("toc_detection")
def detect_table_of_contents(page_1024:list[str], chat_mdl):
    toc_secs = []
    for i, sec in enumerate(page_1024[:22]):
        ans = 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")
def extract_table_of_contents(toc_pages, chat_mdl):
    if not toc_pages:
        return []

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


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 gen_json(prompt, "Only JSON please.", chat_mdl)


TOC_INDEX = load_prompt("toc_index")
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 = 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


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 = gen_json(prompt, "Only JSON please.", chat_mdl)
    return response['completed']


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 = gen_json(prompt, "Only JSON please.", chat_mdl)
    if_complete = 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 = 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 = 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")
def assign_toc_levels(toc_secs, chat_mdl, gen_conf = {"temperature": 0.2}):
    if not toc_secs:
        return []
    return 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):
    try:
        ans = 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 []
        if callback:
            callback(msg="")
    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 = []
    async with trio.open_nursery() as nursery:
        for i, chunk in enumerate(chunk_sections):
            if not chunk:
                continue
            chunks_res.append({"chunks": chunk})
            nursery.start_soon(gen_toc_from_text, chunks_res[-1], chat_mdl, callback)

    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 = 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 = sorted([t.get("level", "0") for t in toc_with_levels])[-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")
def relevant_chunks_with_toc(query: str, toc:list[dict], chat_mdl, topn: int=6):
    import numpy as np
    try:
        ans = 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 []
