library(shinyjs)
library(shinyAce)

## ===== 统一入口=====
output$quickgen_chat <- renderUI({
  tagList(
    useShinyjs(),
    stat_tab_panel(
      menu      = i18n$t("Oneclick generation > AI assistance"),
      tool      = i18n$t("AI chat guidance"),
      tool_ui   = "chat_main_ui",  
      output_panels = tabPanel(
        title = i18n$t("Chat history"),
        value = "chat_panel",
        uiOutput("chat_history_area")  
      )
    )
  )
})

## ===== 左侧区域=====
output$chat_main_ui <- renderUI({
  tagList(
    useShinyjs(),
    wellPanel(
      div(style = "font-weight:bold; color:#1976d2; margin-bottom:10px;",
          icon("database"), " ", i18n$t("Dataset Fields Information")
      ),
      uiOutput("field_info_display"),
      tags$hr(),
      div(style = "color:#666; font-size:0.9em; margin-top:5px;",
          i18n$t("The current dataset's field information is automatically passed to the AI assistant.")
      ),
      style = "max-height:450px; overflow-y:auto; background-color:#f8f9fa;"
    ),
    help_and_report(  
      modal_title = i18n$t("AI chat guidance"),
      fun_name    = "quickgen_chat",
      help_file   = inclMD(file.path(getOption("radiant.path.quickgen"), "app/tools/help/quickgen_chat.md")),
      lic = "by-sa"
    )
  )
})

## ===== 右侧区域=====
output$chat_history_area <- renderUI({
  field_info_encoded <- get_field_info()  
  if (is.null(field_info_encoded)) {
    return(create_no_data_ui())  
  }
  
  dify_base_url <- "http://180.169.131.147:8078/chat/tfjTZpJDgjQpBeTl"
  dify_url <- paste0(
    dify_base_url,
    "?showSidebar=true",  
    "&field_info=", field_info_encoded  
  )
  
  tagList(
    div(
      id = "chat_box",
      style = "height:700px; overflow-y:auto; border:1px solid #ddd;
               border-radius:4px; padding:0; background:#fff; margin-bottom:10px;", 
      tags$iframe(
        src = dify_url,
        style = "width: 100%; height: 100%; border: 0;",  
        frameborder = 0,
        allow = "microphone"
      )
    )
  )
})

# 生成左侧展示的格式化字段文本
output$field_info_display <- renderUI({
  if (is.null(input$dataset) || !exists("r_data")) {
    return(tags$pre(
      i18n$t("Please select a dataset in another page first"),
      style = "margin:0; background-color:#f9f9f9; border:1px solid #ddd; padding:10px; font-size:0.9em;"
    ))
  }
  
  df <- tryCatch({
    get(input$dataset, envir = r_data)
  }, error = function(e) NULL)
  
  if (is.null(df) || !is.data.frame(df) || nrow(df) == 0) {
    return(tags$pre(
      i18n$t("Current dataset is empty"),
      style = "margin:0; background-color:#f9f9f9; border:1px solid #ddd; padding:10px; font-size:0.9em;"
    ))
  }
  
  # 生成带换行的格式
  field_lines <- sprintf('"%s": "%s"', names(df), sapply(df, function(x) class(x)[1]))
  formatted_text <- paste(field_lines, collapse = ",\n")
  
  tags$pre(
    formatted_text,
    style = "margin:0; background-color:#f9f9f9; border:1px solid #ddd; 
             padding:10px; font-size:0.9em; line-height:1.5; white-space:pre-wrap;"
  )
})

# 获取并编码字段信息
get_field_info <- function() {
  if (is.null(input$dataset) || !exists("r_data")) return(NULL)
  
  df <- tryCatch(get(input$dataset, envir = r_data), error = function(e) NULL)
  if (is.null(df) || !is.data.frame(df) || nrow(df) == 0) return(NULL)
  
  fields_summary <- list()
  
  for (col in names(df)) {
    x <- df[[col]]
    cls <- class(x)[1]
    
    # 提取非 NA 的值
    valid_x <- x[!is.na(x)]
    
    if (cls %in% c("numeric", "double")) {
      if (length(valid_x) == 0) {
        fields_summary[[col]] <- list(type = cls)
      } else {
        fields_summary[[col]] <- list(
          type = cls,
          min = round(min(valid_x), 3),
          max = round(max(valid_x), 3),
          mean = round(mean(valid_x), 3)
        )
      }
      
    } else if (cls == "integer") {
      if (length(valid_x) == 0) {
        fields_summary[[col]] <- list(type = cls, levels = list(), n_levels = 0L)
      } else {
        unique_vals <- sort(unique(valid_x))
        n_unique <- length(unique_vals)
        if (n_unique <= 10) {
          levs_out <- unique_vals
        } else {
          levs_out <- c(unique_vals[1:10], "...")
        }
        fields_summary[[col]] <- list(
          type = cls,
          levels = levs_out,
          n_levels = n_unique
        )
      }
      
    } else {
      # factor 或 character
      if (length(valid_x) == 0) {
        fields_summary[[col]] <- list(type = cls, levels = list(), n_levels = 0L)
      } else {
        if (is.factor(x)) {
          # 只取实际出现的值
          unique_vals <- sort(unique(as.character(valid_x)))
        } else {
          unique_vals <- sort(unique(as.character(valid_x)))
        }
        n_unique <- length(unique_vals)
        if (n_unique <= 10) {
          levs_out <- unique_vals
        } else {
          levs_out <- c(unique_vals[1:10], "...")
        }
        fields_summary[[col]] <- list(
          type = cls,
          levels = levs_out,
          n_levels = n_unique
        )
      }
    }
  }
  
  json_struct <- list(
    dataset_name = input$dataset,
    n_rows = nrow(df),
    fields = fields_summary
  )
  URLencode(jsonlite::toJSON(json_struct, auto_unbox = TRUE, digits = 3), reserved = TRUE)
}

# 无数据时的UI
create_no_data_ui <- function() {
  tagList(
    div(
      id = "chat_box",
      style = "height:700px; overflow-y:auto; border:1px solid #ddd;
               border-radius:4px; padding:20px; background:#fff; margin-bottom:10px;",
      p(i18n$t("请选择数据集"), style = "text-align:center; margin-top:50px; color:#888;")
    )
  )
}
