#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
从 stdin 读取 JSON（平台统计列表），生成 xlsx 并输出到 stdout（二进制）。

输入 JSON 格式：
{
  "platforms": [
    {
      "platform": "baijiahao",
      "viewsCount": 5,
      "commentsCount": 1,
      "likesCount": 0,
      "fansIncrease": 1,
      "updateTime": "2026-01-27 14:30:00"
    }
  ]
}
"""

import json
import sys
from io import BytesIO
from datetime import datetime

# Ensure stdin is read as UTF-8 (important on Windows when Node passes UTF-8 JSON)
if sys.platform == "win32":
  import io as _io

  if hasattr(sys.stdin, "buffer"):
    sys.stdin = _io.TextIOWrapper(sys.stdin.buffer, encoding="utf-8", errors="replace")

try:
  from openpyxl import Workbook
  from openpyxl.styles import Font, Alignment, PatternFill, Border, Side
  from openpyxl.utils import get_column_letter
except Exception as e:  # pragma: no cover
  sys.stderr.write(
    "Missing dependency: openpyxl. Please install it in your python env.\n"
    "Example: pip install -r server/python/requirements.txt\n"
    f"Detail: {e}\n"
  )
  sys.exit(3)


HEADERS = [
  "平台",
  "阅读（播放量）",
  "评论量",
  "点赞量",
  "涨粉量",
  "更新时间",
]

COL_WIDTHS = [12, 16, 12, 12, 10, 18]


def _safe_int(v):
  try:
    if v is None or v == "":
      return None
    return int(float(v))
  except Exception:
    return None


def _safe_str(v) -> str:
  """
  将任意值转换为字符串，并过滤掉 Excel 不支持的非法 Unicode 代理字符。
  """
  if v is None:
    return ""
  try:
    s = str(v)
  except Exception:
    s = repr(v)
  return "".join(ch for ch in s if not (0xD800 <= ord(ch) <= 0xDFFF))


def _format_date_only(value: str) -> str:
  """
  将各种时间字符串格式化为 YYYY-MM-DD，仅保留日期部分。
  如果无法解析，则尽量取前 10 位作为日期返回。
  """
  if not value:
    return ""

  s = str(value).strip()
  try:
    if s.endswith("Z"):
      s_clean = s[:-1]
    else:
      s_clean = s
    s_clean = s_clean.replace(" ", "T")
    dt = datetime.fromisoformat(s_clean)
    return dt.strftime("%Y-%m-%d")
  except Exception:
    pass

  if len(s) >= 10:
    return s[:10]

  return s


def build_xlsx(platforms):
  platform_name_map = {
    "douyin": "抖音",
    "baijiahao": "百家号",
    "weixin_video": "视频号",
    "xiaohongshu": "小红书",
    "bilibili": "哔哩哔哩",
    "kuaishou": "快手",
  }

  wb = Workbook()
  ws = wb.active
  ws.title = "平台数据"

  ws.append(HEADERS)

  header_font = Font(bold=True)
  header_fill = PatternFill("solid", fgColor="F2F2F2")
  center = Alignment(horizontal="center", vertical="center", wrap_text=False)
  left = Alignment(horizontal="left", vertical="center", wrap_text=False)
  thin = Side(style="thin", color="D9D9D9")
  border = Border(left=thin, right=thin, top=thin, bottom=thin)

  for col_idx in range(1, len(HEADERS) + 1):
    cell = ws.cell(row=1, column=col_idx)
    cell.font = header_font
    cell.fill = header_fill
    cell.alignment = center
    cell.border = border

  for i, w in enumerate(COL_WIDTHS, start=1):
    col_letter = get_column_letter(i)
    ws.column_dimensions[col_letter].width = w

  for p in platforms:
    platform_raw = (p.get("platform") or "").strip()
    platform_cn = platform_name_map.get(platform_raw, platform_raw)

    ws.append([
      _safe_str(platform_cn),
      _safe_int(p.get("viewsCount")) or 0,
      _safe_int(p.get("commentsCount")) or 0,
      _safe_int(p.get("likesCount")) or 0,
      _safe_int(p.get("fansIncrease")) or 0,
      _safe_str(_format_date_only(p.get("updateTime"))),
    ])

  int_cols = {"B", "C", "D", "E"}

  for row in range(2, ws.max_row + 1):
    for col in range(1, len(HEADERS) + 1):
      c = ws.cell(row=row, column=col)
      c.border = border
      if col == 1:
        c.alignment = left
      else:
        c.alignment = center

    for c_letter in int_cols:
      c = ws[f"{c_letter}{row}"]
      if c.value is not None:
        c.number_format = "0"

  ws.freeze_panes = "A2"

  bio = BytesIO()
  wb.save(bio)
  return bio.getvalue()


def main():
  try:
    raw = sys.stdin.read()
    payload = json.loads(raw) if raw.strip() else {}
  except Exception as e:
    sys.stderr.write(f"Invalid JSON input: {e}\n")
    sys.exit(2)

  platforms = payload.get("platforms") or []
  xlsx_bytes = build_xlsx(platforms)
  sys.stdout.buffer.write(xlsx_bytes)


if __name__ == "__main__":
  main()