#
#  Copyright 2025 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 copy
import csv
import io
import logging
import re
from io import BytesIO
from xpinyin import Pinyin
import numpy as np
import pandas as pd
from collections import Counter

# from openpyxl import load_workbook, Workbook
from dateutil.parser import parse as datetime_parse

from api.db.services.knowledgebase_service import KnowledgebaseService
from deepdoc.parser.figure_parser import vision_figure_parser_figure_xlsx_wrapper
from deepdoc.parser.utils import get_text
from rag.nlp import rag_tokenizer, tokenize, tokenize_table
from deepdoc.parser import ExcelParser
from common import settings


class Excel(ExcelParser):
    def __call__(self, fnm, binary=None, from_page=0, to_page=10000000000, callback=None, **kwargs):
        if not binary:
            wb = Excel._load_excel_to_workbook(fnm)
        else:
            wb = Excel._load_excel_to_workbook(BytesIO(binary))
        total = 0
        for sheet_name in wb.sheetnames:
            total += Excel._get_actual_row_count(wb[sheet_name])
        res, fails, done = [], [], 0
        rn = 0
        flow_images = []
        pending_cell_images = []
        tables = []
        for sheet_name in wb.sheetnames:
            ws = wb[sheet_name]
            images = Excel._extract_images_from_worksheet(ws, sheetname=sheet_name)
            if images:
                image_descriptions = vision_figure_parser_figure_xlsx_wrapper(images=images, callback=callback,
                                                                              **kwargs)
                if image_descriptions and len(image_descriptions) == len(images):
                    for i, bf in enumerate(image_descriptions):
                        images[i]["image_description"] = "\n".join(bf[0][1])
                    for img in images:
                        if img["span_type"] == "single_cell" and img.get("image_description"):
                            pending_cell_images.append(img)
                        else:
                            flow_images.append(img)

            try:
                rows = Excel._get_rows_limited(ws)
            except Exception as e:
                logging.warning(f"Skip sheet '{sheet_name}' due to rows access error: {e}")
                continue
            if not rows:
                continue
            headers, header_rows = self._parse_headers(ws, rows)
            if not headers:
                continue
            data = []
            for i, r in enumerate(rows[header_rows:]):
                rn += 1
                if rn - 1 < from_page:
                    continue
                if rn - 1 >= to_page:
                    break
                row_data = self._extract_row_data(ws, r, header_rows + i, len(headers))
                if row_data is None:
                    fails.append(str(i))
                    continue
                if self._is_empty_row(row_data):
                    continue
                data.append(row_data)
                done += 1
            if len(data) == 0:
                continue
            df = pd.DataFrame(data, columns=headers)
            for img in pending_cell_images:
                excel_row = img["row_from"] - 1
                excel_col = img["col_from"] - 1

                df_row_idx = excel_row - header_rows
                if df_row_idx < 0 or df_row_idx >= len(df):
                    flow_images.append(img)
                    continue

                if excel_col < 0 or excel_col >= len(df.columns):
                    flow_images.append(img)
                    continue

                col_name = df.columns[excel_col]

                if not df.iloc[df_row_idx][col_name]:
                    df.iat[df_row_idx, excel_col] = img["image_description"]
            res.append(df)
        for img in flow_images:
            tables.append(
                (
                    (
                        img["image"],  # Image.Image or LazyImage
                        [img["image_description"]]  # description list (must be list)
                    ),
                    [
                        (0, 0, 0, 0, 0)  # dummy position
                    ]
                )
            )
        callback(0.3, ("Extract records: {}~{}".format(from_page + 1, min(to_page, from_page + rn)) + (
            f"{len(fails)} failure, line: %s..." % (",".join(fails[:3])) if fails else "")))
        return res, tables

    def _parse_headers(self, ws, rows):
        if len(rows) == 0:
            return [], 0
        has_complex_structure = self._has_complex_header_structure(ws, rows)
        if has_complex_structure:
            return self._parse_multi_level_headers(ws, rows)
        else:
            return self._parse_simple_headers(rows)

    def _has_complex_header_structure(self, ws, rows):
        if len(rows) < 1:
            return False
        merged_ranges = list(ws.merged_cells.ranges)
        # 检查前两行是否涉及合并单元格
        for rng in merged_ranges:
            if rng.min_row <= 2:  # 只要合并区域涉及第1或第2行
                return True
        return False

    def _row_looks_like_header(self, row):
        header_like_cells = 0
        data_like_cells = 0
        non_empty_cells = 0
        for cell in row:
            if cell.value is not None:
                non_empty_cells += 1
                val = str(cell.value).strip()
                if self._looks_like_header(val):
                    header_like_cells += 1
                elif self._looks_like_data(val):
                    data_like_cells += 1
        if non_empty_cells == 0:
            return False
        return header_like_cells >= data_like_cells

    def _parse_simple_headers(self, rows):
        if not rows:
            return [], 0
        header_row = rows[0]
        headers = []
        for cell in header_row:
            if cell.value is not None:
                header_value = str(cell.value).strip()
                if header_value:
                    headers.append(header_value)
            else:
                pass
        final_headers = []
        for i, cell in enumerate(header_row):
            if cell.value is not None:
                header_value = str(cell.value).strip()
                if header_value:
                    final_headers.append(header_value)
                else:
                    final_headers.append(f"Column_{i + 1}")
            else:
                final_headers.append(f"Column_{i + 1}")
        return final_headers, 1

    def _parse_multi_level_headers(self, ws, rows):
        if len(rows) < 2:
            return [], 0
        header_rows = self._detect_header_rows(rows)
        if header_rows == 1:
            return self._parse_simple_headers(rows)
        else:
            return self._build_hierarchical_headers(ws, rows, header_rows), header_rows

    def _detect_header_rows(self, rows):
        if len(rows) < 2:
            return 1
        header_rows = 1
        max_check_rows = min(5, len(rows))
        for i in range(1, max_check_rows):
            row = rows[i]
            if self._row_looks_like_header(row):
                header_rows = i + 1
            else:
                break
        return header_rows

    def _looks_like_header(self, value):
        if len(value) < 1:
            return False
        if any(ord(c) > 127 for c in value):
            return True
        if len([c for c in value if c.isalpha()]) >= 2:
            return True
        if any(c in value for c in ["(", ")", "：", ":", "（", "）", "_", "-"]):
            return True
        return False

    def _looks_like_data(self, value):
        if len(value) == 1 and value.upper() in ["Y", "N", "M", "X", "/", "-"]:
            return True
        if value.replace(".", "").replace("-", "").replace(",", "").isdigit():
            return True
        if value.startswith("0x") and len(value) <= 10:
            return True
        return False

    def _build_hierarchical_headers(self, ws, rows, header_rows):
        headers = []
        max_col = max(len(row) for row in rows[:header_rows]) if header_rows > 0 else 0
        merged_ranges = list(ws.merged_cells.ranges)
        for col_idx in range(max_col):
            header_parts = []
            for row_idx in range(header_rows):
                if col_idx < len(rows[row_idx]):
                    cell_value = rows[row_idx][col_idx].value
                    merged_value = self._get_merged_cell_value(ws, row_idx + 1, col_idx + 1, merged_ranges)
                    if merged_value is not None:
                        cell_value = merged_value
                    if cell_value is not None:
                        cell_value = str(cell_value).strip()
                        if cell_value and cell_value not in header_parts and self._is_valid_header_part(cell_value):
                            header_parts.append(cell_value)
            if header_parts:
                header = "-".join(header_parts)
                headers.append(header)
            else:
                headers.append(f"Column_{col_idx + 1}")
        final_headers = [h for h in headers if h and h != "-"]
        return final_headers

    def _is_valid_header_part(self, value):
        if len(value) == 1 and value.upper() in ["Y", "N", "M", "X"]:
            return False
        if value.replace(".", "").replace("-", "").replace(",", "").isdigit():
            return False
        if value in ["/", "-", "+", "*", "="]:
            return False
        return True

    def _get_merged_cell_value(self, ws, row, col, merged_ranges):
        for merged_range in merged_ranges:
            if merged_range.min_row <= row <= merged_range.max_row and merged_range.min_col <= col <= merged_range.max_col:
                return ws.cell(merged_range.min_row, merged_range.min_col).value
        return None

    def _extract_row_data(self, ws, row, absolute_row_idx, expected_cols):
        row_data = []
        merged_ranges = list(ws.merged_cells.ranges)
        actual_row_num = absolute_row_idx + 1
        for col_idx in range(expected_cols):
            cell_value = None
            actual_col_num = col_idx + 1
            try:
                cell_value = ws.cell(row=actual_row_num, column=actual_col_num).value
            except ValueError:
                if col_idx < len(row):
                    cell_value = row[col_idx].value
            if cell_value is None:
                merged_value = self._get_merged_cell_value(ws, actual_row_num, actual_col_num, merged_ranges)
                if merged_value is not None:
                    cell_value = merged_value
                else:
                    cell_value = self._get_inherited_value(ws, actual_row_num, actual_col_num, merged_ranges)
            row_data.append(cell_value)
        return row_data

    def _get_inherited_value(self, ws, row, col, merged_ranges):
        for merged_range in merged_ranges:
            if merged_range.min_row <= row <= merged_range.max_row and merged_range.min_col <= col <= merged_range.max_col:
                return ws.cell(merged_range.min_row, merged_range.min_col).value
        return None

    def _is_empty_row(self, row_data):
        for val in row_data:
            if val is not None and str(val).strip() != "":
                return False
        return True


def trans_datatime(s):
    try:
        return datetime_parse(s.strip()).strftime("%Y-%m-%d %H:%M:%S")
    except Exception:
        return None


def trans_bool(s):
    if re.match(r"(true|yes|是|\*|✓|✔|☑|✅|√)$", str(s).strip(), flags=re.IGNORECASE):
        return "yes"
    if re.match(r"(false|no|否|⍻|×)$", str(s).strip(), flags=re.IGNORECASE):
        return "no"
    return None


def column_data_type(arr):
    arr = list(arr)
    counts = {"int": 0, "float": 0, "text": 0, "datetime": 0, "bool": 0}
    trans = {t: f for f, t in
             [(int, "int"), (float, "float"), (trans_datatime, "datetime"), (trans_bool, "bool"), (str, "text")]}
    float_flag = False
    for a in arr:
        if a is None:
            continue
        if re.match(r"[+-]?[0-9]+$", str(a).replace("%%", "")) and not str(a).replace("%%", "").startswith("0"):
            counts["int"] += 1
            if int(str(a)) > 2 ** 63 - 1:
                float_flag = True
                break
        elif re.match(r"[+-]?[0-9.]{,19}$", str(a).replace("%%", "")) and not str(a).replace("%%", "").startswith("0"):
            counts["float"] += 1
        elif re.match(r"(true|yes|是|\*|✓|✔|☑|✅|√|false|no|否|⍻|×)$", str(a), flags=re.IGNORECASE):
            counts["bool"] += 1
        elif trans_datatime(str(a)):
            counts["datetime"] += 1
        else:
            counts["text"] += 1
    if float_flag:
        ty = "float"
    else:
        counts = sorted(counts.items(), key=lambda x: x[1] * -1)
        ty = counts[0][0]
    for i in range(len(arr)):
        if arr[i] is None:
            continue
        try:
            arr[i] = trans[ty](str(arr[i]))
        except Exception as e:
            arr[i] = None
            logging.warning(f"Column {i}: {e}")
    # if ty == "text":
    #    if len(arr) > 128 and uni / len(arr) < 0.1:
    #        ty = "keyword"
    return arr, ty


def chunk(filename, binary=None, from_page=0, to_page=10000000000, lang="Chinese", callback=None, **kwargs):
    """
    Excel and csv(txt) format files are supported.
    For csv or txt file, the delimiter between columns is TAB.
    The first line must be column headers.
    Column headers must be meaningful terms inorder to make our NLP model understanding.
    It's good to enumerate some synonyms using slash '/' to separate, and even better to
    enumerate values using brackets like 'gender/sex(male, female)'.
    Here are some examples for headers:
        1. supplier/vendor\tcolor(yellow, red, brown)\tgender/sex(male, female)\tsize(M,L,XL,XXL)
        2. 姓名/名字\t电话/手机/微信\t最高学历（高中，职高，硕士，本科，博士，初中，中技，中专，专科，专升本，MPA，MBA，EMBA）

    Every row in table will be treated as a chunk.
    """
    tbls = []
    is_english = lang.lower() == "english"
    if re.search(r"\.xlsx?$", filename, re.IGNORECASE):
        callback(0.1, "Start to parse.")
        excel_parser = Excel()
        dfs, tbls = excel_parser(filename, binary, from_page=from_page, to_page=to_page, callback=callback, **kwargs)
    elif re.search(r"\.txt$", filename, re.IGNORECASE):
        callback(0.1, "Start to parse.")
        txt = get_text(filename, binary)
        lines = txt.split("\n")
        fails = []
        headers = lines[0].split(kwargs.get("delimiter", "\t"))
        rows = []
        for i, line in enumerate(lines[1:]):
            if i < from_page:
                continue
            if i >= to_page:
                break
            row = [field for field in line.split(kwargs.get("delimiter", "\t"))]
            if len(row) != len(headers):
                fails.append(str(i))
                continue
            rows.append(row)

        callback(0.3, ("Extract records: {}~{}".format(from_page, min(len(lines), to_page)) + (
            f"{len(fails)} failure, line: %s..." % (",".join(fails[:3])) if fails else "")))

        dfs = [pd.DataFrame(np.array(rows), columns=headers)]
    elif re.search(r"\.csv$", filename, re.IGNORECASE):
        callback(0.1, "Start to parse.")
        txt = get_text(filename, binary)
        delimiter = kwargs.get("delimiter", ",")

        reader = csv.reader(io.StringIO(txt), delimiter=delimiter)
        all_rows = list(reader)
        if not all_rows:
            raise ValueError("Empty CSV file")

        headers = all_rows[0]
        fails = []
        rows = []

        for i, row in enumerate(all_rows[1 + from_page: 1 + to_page]):
            if len(row) != len(headers):
                fails.append(str(i + from_page))
                continue
            rows.append(row)

        callback(
            0.3,
            (f"Extract records: {from_page}~{from_page + len(rows)}" +
             (f"{len(fails)} failure, line: {','.join(fails[:3])}..." if fails else ""))
        )

        dfs = [pd.DataFrame(rows, columns=headers)]
    else:
        raise NotImplementedError("file type not supported yet(excel, text, csv supported)")

    res = []
    PY = Pinyin()
    # Field type suffixes for database columns
    # Maps data types to their database field suffixes
    fields_map = {"text": "_tks", "int": "_long", "keyword": "_kwd", "float": "_flt", "datetime": "_dt", "bool": "_kwd"}
    for df in dfs:
        for n in ["id", "_id", "index", "idx"]:
            if n in df.columns:
                del df[n]
        clmns = df.columns.values
        if len(clmns) != len(set(clmns)):
            col_counts = Counter(clmns)
            duplicates = [col for col, count in col_counts.items() if count > 1]
            if duplicates:
                raise ValueError(f"Duplicate column names detected: {duplicates}\nFrom: {clmns}")

        txts = list(copy.deepcopy(clmns))
        py_clmns = [PY.get_pinyins(re.sub(r"(/.*|（[^（）]+?）|\([^()]+?\))", "", str(n)), "_")[0] for n in clmns]
        clmn_tys = []
        for j in range(len(clmns)):
            cln, ty = column_data_type(df[clmns[j]])
            clmn_tys.append(ty)
            df[clmns[j]] = cln
            if ty == "text":
                txts.extend([str(c) for c in cln if c])
        clmns_map = [(py_clmns[i].lower() + fields_map[clmn_tys[i]], str(clmns[i]).replace("_", " ")) for i in
                     range(len(clmns))]
        # For Infinity/OceanBase: Use original column names as keys since they're stored in chunk_data JSON
        # For ES/OS: Use full field names with type suffixes (e.g., url_kwd, body_tks)
        if settings.DOC_ENGINE_INFINITY or settings.DOC_ENGINE_OCEANBASE:
            # For Infinity/OceanBase: key = original column name, value = display name
            field_map = {py_clmns[i].lower(): str(clmns[i]).replace("_", " ") for i in range(len(clmns))}
        else:
            # For ES/OS: key = typed field name, value = display name
            field_map = {k: v for k, v in clmns_map}
        logging.debug(f"Field map: {field_map}")
        KnowledgebaseService.update_parser_config(kwargs["kb_id"], {"field_map": field_map})

        eng = lang.lower() == "english"  # is_english(txts)
        for ii, row in df.iterrows():
            d = {"docnm_kwd": filename, "title_tks": rag_tokenizer.tokenize(re.sub(r"\.[a-zA-Z]+$", "", filename))}
            row_fields = []
            data_json = {}  # For Infinity: Store all columns in a JSON object
            for j in range(len(clmns)):
                if row[clmns[j]] is None:
                    continue
                if not str(row[clmns[j]]):
                    continue
                if not isinstance(row[clmns[j]], pd.Series) and pd.isna(row[clmns[j]]):
                    continue
                # For Infinity/OceanBase: Store in chunk_data JSON column
                # For Elasticsearch/OpenSearch: Store as individual fields with type suffixes
                if settings.DOC_ENGINE_INFINITY or settings.DOC_ENGINE_OCEANBASE:
                    data_json[str(clmns[j])] = row[clmns[j]]
                else:
                    fld = clmns_map[j][0]
                    d[fld] = row[clmns[j]] if clmn_tys[j] != "text" else rag_tokenizer.tokenize(row[clmns[j]])
                row_fields.append((clmns[j], row[clmns[j]]))
            if not row_fields:
                continue
            # Add the data JSON field to the document (for Infinity/OceanBase)
            if settings.DOC_ENGINE_INFINITY or settings.DOC_ENGINE_OCEANBASE:
                d["chunk_data"] = data_json
            # Format as a structured text for better LLM comprehension
            # Format each field as "- Field Name: Value" on separate lines
            formatted_text = "\n".join([f"- {field}: {value}" for field, value in row_fields])
            tokenize(d, formatted_text, eng)
            res.append(d)
        if tbls:
            doc = {"docnm_kwd": filename, "title_tks": rag_tokenizer.tokenize(re.sub(r"\.[a-zA-Z]+$", "", filename))}
            res.extend(tokenize_table(tbls, doc, is_english))
    callback(0.35, "")

    return res


if __name__ == "__main__":
    import sys


    def dummy(prog=None, msg=""):
        pass


    chunk(sys.argv[1], callback=dummy)
