from __future__ import annotations
import os, json, subprocess, sys
from pathlib import Path
from typing import Any, Callable, Dict, List, Optional
import pandas as pd
from docx import Document
from config_model import AppConfig, PlaceholderConfig, DbConnectionConfig
from influx_service import InfluxConnectionParams, InfluxService
from logger import get_logger

logger = get_logger()
_PROGRESS_CB: Optional[Callable[[str, int, int], None]] = None

def set_progress_callback(cb): 
    global _PROGRESS_CB; _PROGRESS_CB = cb
def _progress(msg, cur, total):
    if _PROGRESS_CB: _PROGRESS_CB(msg, cur, total)

def _build_influx_service(cfg):
    return InfluxService(InfluxConnectionParams(url=cfg.influx.url, org=cfg.influx.org, token=cfg.influx.token))

def _execute_db_query(ph, db_cfg):
    query = (ph.dbQuery or "").strip()
    if not query: return ""
    if not db_cfg: db_cfg = DbConnectionConfig()
    engine = (db_cfg.engine or "mysql").lower()
    
    if engine in ("sqlite", "sqlite3"):
        import sqlite3
        conn = sqlite3.connect(db_cfg.database or str(Path(__file__).parent / "experiments.db"))
        result = conn.execute(query).fetchone()
        conn.close()
        return str(result[0]) if result and result[0] else ""
    elif engine == "mysql":
        import pymysql
        conn = pymysql.connect(host=getattr(db_cfg, "host", "localhost"), port=int(getattr(db_cfg, "port", 3306)),
                               user=getattr(db_cfg, "username", ""), password=getattr(db_cfg, "password", ""),
                               database=getattr(db_cfg, "database", ""), charset="utf8mb4")
        with conn.cursor() as cursor:
            cursor.execute(query)
            result = cursor.fetchone()
        conn.close()
        return str(result[0]) if result and result[0] else ""
    return ""

def _load_script_data_from_db(experiment_id):
    try:
        import sqlite3
        conn = sqlite3.connect(str(Path(__file__).parent / "experiments.db"))
        result = conn.execute("SELECT script_data FROM experiments WHERE id=?", (experiment_id,)).fetchone()
        conn.close()
        if result and result[0]:
            logger.info("从数据库加载脚本数据，实验ID: %d", experiment_id)
            return json.loads(result[0])
    except Exception as e:
        logger.error("加载脚本数据失败: %s", e)
    return None

def _parse_script_tables(script_data):
    tables = {}
    if isinstance(script_data, dict) and "tables" in script_data:
        for item in script_data["tables"]:
            key = item.get("token") or item.get("key")
            if key: tables[str(key)] = item
    return tables

def _replace_texts_docx(doc, mapping):
    for key, val in mapping.items():
        token = '{' + key + '}'
        replacement = val or ''
        for para in doc.paragraphs:
            if token in para.text:
                for run in para.runs:
                    if token in run.text:
                        run.text = run.text.replace(token, replacement)
        for table in doc.tables:
            for row in table.rows:
                for cell in row.cells:
                    for para in cell.paragraphs:
                        if token in para.text:
                            for run in para.runs:
                                if token in run.text:
                                    run.text = run.text.replace(token, replacement)

def _fill_script_table_docx(doc, token, table_spec):
    cells = table_spec.get("cells") or []
    if not cells: return
    
    token_with_braces = '{' + token + '}'
    table_found = None
    token_row = token_col = 0
    
    for table in doc.tables:
        for ri, row in enumerate(table.rows):
            for ci, cell in enumerate(row.cells):
                if token_with_braces in cell.text:
                    table_found, token_row, token_col = table, ri, ci
                    break
            if table_found: break
        if table_found: break
    
    if not table_found:
        logger.warning("未找到token: %s", token_with_braces)
        return
    
    # 清除token
    for para in table_found.rows[token_row].cells[token_col].paragraphs:
        for run in para.runs:
            run.text = run.text.replace(token_with_braces, '')
    
    # 填充数据
    for cell_info in cells:
        if not isinstance(cell_info, dict): continue
        value = cell_info.get("value")
        if value is None: continue
        
        row = int(cell_info.get("row", 0))
        col = int(cell_info.get("col", 0))
        
        try:
            if row < len(table_found.rows) and col < len(table_found.rows[row].cells):
                table_found.rows[row].cells[col].text = str(value)
        except Exception as e:
            logger.warning("填充失败 (%d,%d): %s", row, col, e)

def render_report(template_path, cfg, output_path, experiment_id=None):
    logger.info("=== 开始生成报告 ===")
    _progress("加载数据", 0, 5)
    
    # 加载脚本数据
    script_data = _load_script_data_from_db(experiment_id) if experiment_id else None
    script_tables = _parse_script_tables(script_data)
    logger.info("脚本表格: %s", list(script_tables.keys()))
    
    # 打开模板
    doc = Document(str(template_path))
    _progress("替换文本", 1, 5)
    
    # 构建文本映射
    text_map = {}
    if hasattr(cfg, 'placeholders'):
        placeholders = cfg.placeholders if isinstance(cfg.placeholders, dict) else {}
        for key, ph in placeholders.items():
            if hasattr(ph, 'type'):
                if ph.type == "text" and hasattr(ph, 'value'):
                    text_map[key] = ph.value or ''
                elif ph.type == "dbText" and hasattr(ph, 'dbQuery'):
                    text_map[key] = _execute_db_query(ph, getattr(cfg, 'db', None))
    
    logger.info("文本映射: %d 个", len(text_map))
    _replace_texts_docx(doc, text_map)
    
    # 填充表格
    _progress("填充表格", 2, 5)
    for token, spec in script_tables.items():
        _fill_script_table_docx(doc, token, spec)
    
    # 保存
    _progress("保存", 4, 5)
    doc.save(str(output_path))
    _progress("完成", 5, 5)
    logger.info("=== 报告生成完成 ===")
    return output_path