#' @tool_code ST_BASELINE_TABLE
#' @name 基线特征表（复合工具）
#' @version 1.0.0
#' @description 基于 gtsummary 的一键式基线特征表生成，自动判断变量类型、选择统计方法、输出标准三线表
#' @author SSA-Pro Team
#' @note 复合工具：一次遍历所有变量，自动选方法（T/Wilcoxon/χ²/Fisher），合并出表

library(glue)
library(ggplot2)
library(base64enc)

run_analysis <- function(input) {
  # ===== 初始化 =====
  logs <- c()
  log_add <- function(msg) { logs <<- c(logs, paste0("[", Sys.time(), "] ", msg)) }
  warnings_list <- c()

  on.exit({}, add = TRUE)

  # ===== 依赖检查 =====
  required_pkgs <- c("gtsummary", "gt", "broom")
  for (pkg in required_pkgs) {
    if (!requireNamespace(pkg, quietly = TRUE)) {
      return(make_error(ERROR_CODES$E101_PACKAGE_MISSING, package = pkg))
    }
  }

  library(gtsummary)
  library(dplyr)

  # ===== 数据加载 =====
  log_add("开始加载输入数据")
  df <- tryCatch(
    load_input_data(input),
    error = function(e) {
      log_add(paste("数据加载失败:", e$message))
      return(NULL)
    }
  )

  if (is.null(df)) {
    return(make_error(ERROR_CODES$E100_INTERNAL_ERROR, details = "数据加载失败"))
  }
  log_add(glue("数据加载成功: {nrow(df)} 行, {ncol(df)} 列"))

  p <- input$params
  group_var <- p$group_var
  analyze_vars <- as.character(unlist(p$analyze_vars))

  # ===== 参数校验 =====
  if (is.null(group_var) || !(group_var %in% names(df))) {
    return(make_error(ERROR_CODES$E001_COLUMN_NOT_FOUND, col = group_var %||% "NULL"))
  }

  if (is.null(analyze_vars) || length(analyze_vars) == 0) {
    analyze_vars <- setdiff(names(df), group_var)
    log_add(glue("未指定分析变量，自动选取全部 {length(analyze_vars)} 个变量"))
  }

  missing_vars <- analyze_vars[!(analyze_vars %in% names(df))]
  if (length(missing_vars) > 0) {
    return(make_error(ERROR_CODES$E001_COLUMN_NOT_FOUND,
      col = paste(missing_vars, collapse = ", ")))
  }

  # ===== 数据清洗 =====
  original_rows <- nrow(df)
  df <- df[!is.na(df[[group_var]]) & trimws(as.character(df[[group_var]])) != "", ]
  removed_rows <- original_rows - nrow(df)
  if (removed_rows > 0) {
    log_add(glue("分组变量缺失值清洗: 移除 {removed_rows} 行 (剩余 {nrow(df)} 行)"))
  }

  groups <- unique(df[[group_var]])
  n_groups <- length(groups)
  if (n_groups < 2) {
    return(make_error(ERROR_CODES$E003_INSUFFICIENT_GROUPS,
      col = group_var, expected = "2+", actual = n_groups))
  }

  # 样本量检查
  sample_check <- check_sample_size(nrow(df), min_required = 10, action = ACTION_BLOCK)
  if (!sample_check$passed) {
    return(list(status = "blocked", message = sample_check$reason, trace_log = logs))
  }

  # 确保分组变量是因子
  df[[group_var]] <- as.factor(df[[group_var]])

  # 选取分析列
  df_analysis <- df[, c(group_var, analyze_vars), drop = FALSE]

  log_add(glue("分组变量: {group_var} ({n_groups} 组: {paste(groups, collapse=', ')})"))
  log_add(glue("分析变量: {length(analyze_vars)} 个"))

  # ===== 核心计算：gtsummary =====
  log_add("使用 gtsummary 生成基线特征表")

  tbl <- tryCatch(
    withCallingHandlers(
      {
        tbl_summary(
          df_analysis,
          by = all_of(group_var),
          missing = "ifany",
          statistic = list(
            all_continuous() ~ "{mean} ({sd})",
            all_categorical() ~ "{n} ({p}%)"
          ),
          digits = list(
            all_continuous() ~ 2,
            all_categorical() ~ c(0, 1)
          )
        ) %>%
          add_p() %>%
          add_overall()
      },
      warning = function(w) {
        warnings_list <<- c(warnings_list, w$message)
        log_add(paste("gtsummary 警告:", w$message))
        invokeRestart("muffleWarning")
      }
    ),
    error = function(e) {
      log_add(paste("gtsummary 生成失败:", e$message))
      return(NULL)
    }
  )

  if (is.null(tbl)) {
    return(map_r_error("gtsummary 基线特征表生成失败"))
  }

  log_add("gtsummary 表格生成成功")

  # ===== 提取结构化数据 =====
  tbl_df <- as.data.frame(tbl$table_body)

  # 提取显著变量列表
  significant_vars <- extract_significant_vars(tbl, alpha = 0.05)
  log_add(glue("显著变量 (P < 0.05): {length(significant_vars)} 个"))

  # 提取每个变量使用的统计方法
  method_info <- extract_method_info(tbl)

  # ===== 转换为 report_blocks =====
  log_add("转换 gtsummary → report_blocks")
  blocks <- gtsummary_to_blocks(tbl, group_var, groups, analyze_vars, significant_vars)

  # ===== 构建结构化结果 =====
  output_results <- list(
    method = "gtsummary::tbl_summary + add_p",
    group_var = group_var,
    n_groups = n_groups,
    groups = lapply(groups, function(g) {
      list(label = as.character(g), n = sum(df[[group_var]] == g))
    }),
    n_variables = length(analyze_vars),
    significant_vars = significant_vars,
    method_info = method_info,
    total_n = nrow(df)
  )

  # ===== 生成可复现代码 =====
  original_filename <- if (!is.null(input$original_filename) && nchar(input$original_filename) > 0) {
    input$original_filename
  } else {
    "data.csv"
  }

  vars_str <- paste0('c("', paste(analyze_vars, collapse = '", "'), '")')

  reproducible_code <- glue('
# SSA-Pro 自动生成代码
# 工具: 基线特征表 (gtsummary)
# 时间: {Sys.time()}
# ================================

# 自动安装依赖
required_packages <- c("gtsummary", "gt", "dplyr")
new_packages <- required_packages[!(required_packages %in% installed.packages()[,"Package"])]
if(length(new_packages)) install.packages(new_packages, repos = "https://cloud.r-project.org")

library(gtsummary)
library(dplyr)

# 数据准备
df <- read.csv("{original_filename}")
group_var <- "{group_var}"
analyze_vars <- {vars_str}

df_analysis <- df[, c(group_var, analyze_vars)]
df_analysis[[group_var]] <- as.factor(df_analysis[[group_var]])

# 生成基线特征表
tbl <- tbl_summary(
  df_analysis,
  by = all_of(group_var),
  missing = "ifany",
  statistic = list(
    all_continuous() ~ "{{mean}} ({{sd}})",
    all_categorical() ~ "{{n}} ({{p}}%)"
  )
) %>%
  add_p() %>%
  add_overall()

# 显示结果
tbl

# 导出为 Word（可选）
# tbl %>% as_gt() %>% gt::gtsave("baseline_table.docx")
')

  # ===== 返回结果 =====
  log_add("分析完成")

  return(list(
    status = "success",
    message = "基线特征表生成完成",
    warnings = if (length(warnings_list) > 0) warnings_list else NULL,
    results = output_results,
    report_blocks = blocks,
    plots = list(),
    trace_log = logs,
    reproducible_code = as.character(reproducible_code)
  ))
}

# ===== gtsummary → report_blocks 转换层 =====

#' 将 gtsummary 表格转为 report_blocks
gtsummary_to_blocks <- function(tbl, group_var, groups, analyze_vars, significant_vars) {
  blocks <- list()

  # 提取 tibble 格式
  tbl_data <- gtsummary::as_tibble(tbl, col_labels = FALSE)

  # Block 1: 三线表（核心输出）
  headers <- colnames(tbl_data)
  rows <- lapply(seq_len(nrow(tbl_data)), function(i) {
    row <- as.list(tbl_data[i, ])
    lapply(row, function(cell) {
      val <- as.character(cell)
      if (is.na(val) || val == "NA") "" else val
    })
  })

  # 标记 P < 0.05 的行
  p_col_idx <- which(grepl("p.value|p_value", headers, ignore.case = TRUE))

  blocks[[length(blocks) + 1]] <- make_table_block(
    headers, rows,
    title = glue("基线特征表 (按 {group_var} 分组)"),
    footnote = "连续变量: Mean (SD); 分类变量: N (%); P 值由自动选择的统计方法计算",
    metadata = list(
      is_baseline_table = TRUE,
      group_var = group_var,
      has_p_values = length(p_col_idx) > 0
    )
  )

  # Block 2: 样本量概况
  group_n_items <- lapply(groups, function(g) {
    list(key = as.character(g), value = "—")
  })
  blocks[[length(blocks) + 1]] <- make_kv_block(
    list("总样本量" = as.character(nrow(tbl$inputs$data)),
         "分组变量" = group_var,
         "分组数" = as.character(length(groups)),
         "分析变量数" = as.character(length(analyze_vars))),
    title = "样本概况"
  )

  # Block 3: 显著变量摘要
  if (length(significant_vars) > 0) {
    conclusion <- glue("在 α = 0.05 水平下，以下变量在组间存在显著差异：**{paste(significant_vars, collapse = '**、**')}**（共 {length(significant_vars)} 个）。")
  } else {
    conclusion <- "在 α = 0.05 水平下，未发现各组间存在显著差异的基线变量。"
  }
  blocks[[length(blocks) + 1]] <- make_markdown_block(conclusion, title = "组间差异摘要")

  return(blocks)
}

#' 从 gtsummary 提取显著变量
extract_significant_vars <- function(tbl, alpha = 0.05) {
  body <- tbl$table_body
  p_vals <- as.numeric(unlist(body$p.value))
  vars <- as.character(body$variable)
  sig_idx <- which(!is.na(p_vals) & p_vals < alpha)
  if (length(sig_idx) == 0) return(character(0))
  unique(vars[sig_idx])
}

#' 提取每个变量使用的统计方法
extract_method_info <- function(tbl) {
  body <- tbl$table_body
  p_vals <- as.numeric(unlist(body$p.value))
  has_p <- which(!is.na(p_vals))
  if (length(has_p) == 0) return(list())

  test_names <- if ("test_name" %in% colnames(body)) as.character(unlist(body$test_name)) else rep("unknown", nrow(body))

  lapply(has_p, function(i) {
    list(
      variable = as.character(body$variable[i]),
      test_name = test_names[i] %||% "unknown",
      p_value = round(p_vals[i], 4),
      p_value_fmt = format_p_value(p_vals[i])
    )
  })
}

# NULL 合并运算符
`%||%` <- function(x, y) if (is.null(x)) y else x