batch_processing.mbt

// OCR 批处理引擎（v12.25.0 P4 工程化）
// 批量文档处理、进度跟踪、错误恢复、结果汇总、内存管理、性能优化

///|
/// 批处理配置
pub(all) struct BatchOcrConfig {
  max_concurrent : Int // 最大并发数
  batch_size : Int // 每批处理数量
  enable_progress_callback : Bool // 是否启用进度回调
  enable_error_recovery : Bool // 是否启用错误恢复
  output_format : String // 输出格式："text" / "hocr" / "json" / "markdown"
  dpi : Int // 处理 DPI
  preprocess_config : String // 预处理配置："auto" / "standard" / "enhanced" / "heavy"
  save_intermediate : Bool // 是否保存中间结果
  output_directory : String // 输出目录
}

///|
/// 批处理任务状态
pub(all) enum BatchTaskStatus {
  Pending
  Processing
  Completed
  Failed
  Skipped
} derive(Eq)

///|
/// 单个批处理任务
pub(all) struct BatchTask {
  task_id : String
  input_path : String
  output_path : String
  status : BatchTaskStatus
  progress : Double
  error_message : String
  start_time : Double
  end_time : Double
  page_count : Int
  char_count : Int
  accuracy_estimate : Double
}

///|
/// 批处理进度
pub(all) struct BatchProgress {
  total_tasks : Int
  completed_tasks : Int
  failed_tasks : Int
  skipped_tasks : Int
  current_task_index : Int
  overall_progress : Double
  current_task_progress : Double
  elapsed_time_ms : Double
  estimated_remaining_ms : Double
  pages_per_second : Double
  chars_per_second : Double
}

///|
/// 批处理结果汇总
pub(all) struct BatchResultSummary {
  total_tasks : Int
  successful_tasks : Int
  failed_tasks : Int
  skipped_tasks : Int
  success_rate : Double
  total_pages : Int
  total_chars : Int
  total_time_ms : Double
  average_accuracy : Double
  average_pages_per_second : Double
  average_chars_per_second : Double
  failed_task_ids : Array[String]
  output_files : Array[String]
}

///|
/// 内存使用统计
pub(all) struct MemoryUsageStats {
  current_usage_mb : Double
  peak_usage_mb : Double
  average_usage_mb : Double
  total_allocated : Int
  total_freed : Int
  gc_count : Int
}

///|
/// 创建默认批处理配置
pub fn create_default_batch_config() -> BatchOcrConfig {
  BatchOcrConfig::{
    max_concurrent: 2,
    batch_size: 10,
    enable_progress_callback: true,
    enable_error_recovery: true,
    output_format: "markdown",
    dpi: 300,
    preprocess_config: "auto",
    save_intermediate: false,
    output_directory: "./ocr_output",
  }
}

///|
/// 创建批处理任务列表
pub fn create_batch_tasks(
  input_files : Array[String],
  output_directory : String,
  output_format : String,
) -> Array[BatchTask] raise @types.LoadError {
  // 输入验证
  if input_files.length() == 0 {
    raise @types.LoadError::DecodeFailed(
      "create_batch_tasks: 输入文件列表不能为空",
    )
  }
  if output_directory.length() == 0 {
    raise @types.LoadError::DecodeFailed(
      "create_batch_tasks: 输出目录不能为空",
    )
  }
  if output_format.length() == 0 {
    raise @types.LoadError::DecodeFailed(
      "create_batch_tasks: 输出格式不能为空",
    )
  }
  let tasks : Array[BatchTask] = []
  for i in 0..<input_files.length() {
    let input_path = input_files[i]
    // 生成输出路径
    let extension = match output_format {
      "text" => ".txt"
      "hocr" => ".hocr"
      "json" => ".json"
      "markdown" => ".md"
      _ => ".txt"
    }
    let output_path = output_directory + "/output_" + i.to_string() + extension
    let task_id = "task_" + i.to_string()
    tasks.push(BatchTask::{
      task_id,
      input_path,
      output_path,
      status: BatchTaskStatus::Pending,
      progress: 0.0,
      error_message: "",
      start_time: 0.0,
      end_time: 0.0,
      page_count: 0,
      char_count: 0,
      accuracy_estimate: 0.0,
    })
  }
  tasks
}

///|
/// 更新任务进度
pub fn update_task_progress(
  task : BatchTask,
  progress : Double,
  current_page : Int,
  total_pages : Int,
) -> BatchTask {
  ignore(current_page)
  let new_progress = if progress > 1.0 {
    1.0
  } else if progress < 0.0 {
    0.0
  } else {
    progress
  }
  BatchTask::{
    task_id: task.task_id,
    input_path: task.input_path,
    output_path: task.output_path,
    status: BatchTaskStatus::Processing,
    progress: new_progress,
    error_message: task.error_message,
    start_time: task.start_time,
    end_time: task.end_time,
    page_count: total_pages,
    char_count: task.char_count,
    accuracy_estimate: task.accuracy_estimate,
  }
}

///|
/// 标记任务完成
pub fn mark_task_completed(
  task : BatchTask,
  char_count : Int,
  accuracy : Double,
  end_time : Double,
) -> BatchTask {
  BatchTask::{
    task_id: task.task_id,
    input_path: task.input_path,
    output_path: task.output_path,
    status: BatchTaskStatus::Completed,
    progress: 1.0,
    error_message: "",
    start_time: task.start_time,
    end_time,
    page_count: task.page_count,
    char_count,
    accuracy_estimate: accuracy,
  }
}

///|
/// 标记任务失败
pub fn mark_task_failed(
  task : BatchTask,
  error_message : String,
  end_time : Double,
) -> BatchTask {
  BatchTask::{
    task_id: task.task_id,
    input_path: task.input_path,
    output_path: task.output_path,
    status: BatchTaskStatus::Failed,
    progress: task.progress,
    error_message,
    start_time: task.start_time,
    end_time,
    page_count: task.page_count,
    char_count: task.char_count,
    accuracy_estimate: 0.0,
  }
}

///|
/// 计算批处理进度
pub fn calculate_batch_progress(
  tasks : Array[BatchTask],
  elapsed_time_ms : Double,
) -> BatchProgress raise @types.LoadError {
  // 输入验证
  if tasks.length() == 0 {
    raise @types.LoadError::DecodeFailed(
      "calculate_batch_progress: 任务列表不能为空",
    )
  }
  if elapsed_time_ms < 0.0 {
    raise @types.LoadError::DecodeFailed(
      "calculate_batch_progress: 已用时间不能为负数",
    )
  }
  let mut completed = 0
  let mut failed = 0
  let mut skipped = 0
  let mut current_index = 0
  let mut total_progress = 0.0
  let mut current_progress = 0.0
  let mut total_pages = 0
  let mut total_chars = 0

  for i in 0..<tasks.length() {
    let task = tasks[i]
    match task.status {
      BatchTaskStatus::Completed => {
        completed += 1
        total_progress += 1.0
        total_pages += task.page_count
        total_chars += task.char_count
      }
      BatchTaskStatus::Failed => {
        failed += 1
        total_progress += task.progress
      }
      BatchTaskStatus::Skipped => skipped += 1
      BatchTaskStatus::Processing => {
        current_index = i
        current_progress = task.progress
        total_progress += task.progress
      }
      BatchTaskStatus::Pending => ()
    }
  }

  let overall = if tasks.length() > 0 {
    total_progress / tasks.length().to_double()
  } else {
    0.0
  }
  let elapsed_seconds = elapsed_time_ms / 1000.0
  let pages_per_second = if elapsed_seconds > 0 {
    total_pages.to_double() / elapsed_seconds
  } else {
    0.0
  }
  let chars_per_second = if elapsed_seconds > 0 {
    total_chars.to_double() / elapsed_seconds
  } else {
    0.0
  }

  // 估算剩余时间
  let estimated_remaining = if completed > 0 {
    let avg_time_per_task = elapsed_time_ms / completed.to_double()
    let remaining_tasks = tasks.length() - completed - failed
    avg_time_per_task * remaining_tasks.to_double()
  } else {
    0.0
  }

  BatchProgress::{
    total_tasks: tasks.length(),
    completed_tasks: completed,
    failed_tasks: failed,
    skipped_tasks: skipped,
    current_task_index: current_index,
    overall_progress: overall,
    current_task_progress: current_progress,
    elapsed_time_ms,
    estimated_remaining_ms: estimated_remaining,
    pages_per_second,
    chars_per_second,
  }
}

///|
/// 生成批处理结果汇总
pub fn generate_batch_summary(
  tasks : Array[BatchTask],
  total_time_ms : Double,
) -> BatchResultSummary raise @types.LoadError {
  // 输入验证
  if tasks.length() == 0 {
    raise @types.LoadError::DecodeFailed(
      "generate_batch_summary: 任务列表不能为空",
    )
  }
  if total_time_ms < 0.0 {
    raise @types.LoadError::DecodeFailed(
      "generate_batch_summary: 总时间不能为负数",
    )
  }
  let mut successful = 0
  let mut failed = 0
  let mut skipped = 0
  let mut total_pages = 0
  let mut total_chars = 0
  let mut total_accuracy = 0.0
  let failed_ids : Array[String] = []
  let output_files : Array[String] = []

  for task in tasks {
    match task.status {
      BatchTaskStatus::Completed => {
        successful += 1
        total_pages += task.page_count
        total_chars += task.char_count
        total_accuracy += task.accuracy_estimate
        output_files.push(task.output_path)
      }
      BatchTaskStatus::Failed => {
        failed += 1
        failed_ids.push(task.task_id)
      }
      BatchTaskStatus::Skipped => skipped += 1
      _ => ()
    }
  }

  let success_rate = if tasks.length() > 0 {
    successful.to_double() / tasks.length().to_double()
  } else {
    0.0
  }
  let avg_accuracy = if successful > 0 {
    total_accuracy / successful.to_double()
  } else {
    0.0
  }
  let total_seconds = total_time_ms / 1000.0
  let avg_pages_per_second = if total_seconds > 0 {
    total_pages.to_double() / total_seconds
  } else {
    0.0
  }
  let avg_chars_per_second = if total_seconds > 0 {
    total_chars.to_double() / total_seconds
  } else {
    0.0
  }

  BatchResultSummary::{
    total_tasks: tasks.length(),
    successful_tasks: successful,
    failed_tasks: failed,
    skipped_tasks: skipped,
    success_rate,
    total_pages,
    total_chars,
    total_time_ms,
    average_accuracy: avg_accuracy,
    average_pages_per_second: avg_pages_per_second,
    average_chars_per_second: avg_chars_per_second,
    failed_task_ids: failed_ids,
    output_files,
  }
}

///|
/// 生成批处理报告
pub fn batch_summary_to_string(summary : BatchResultSummary) -> String {
  let mut report = "## OCR 批处理结果报告\n\n"
  report = report + "### 整体统计\n\n"
  report = report + "| 指标 | 数值 |\n"
  report = report + "|------|------|\n"
  report = report +
    "| 总任务数 | " +
    summary.total_tasks.to_string() +
    " |\n"
  report = report +
    "| 成功任务 | " +
    summary.successful_tasks.to_string() +
    " |\n"
  report = report +
    "| 失败任务 | " +
    summary.failed_tasks.to_string() +
    " |\n"
  report = report +
    "| 跳过任务 | " +
    summary.skipped_tasks.to_string() +
    " |\n"
  report = report +
    "| **成功率** | **" +
    (summary.success_rate * 100.0).to_string() +
    "%** |\n"
  report = report + "| 总页数 | " + summary.total_pages.to_string() + " |\n"
  report = report +
    "| 总字符数 | " +
    summary.total_chars.to_string() +
    " |\n"
  report = report +
    "| 总耗时 | " +
    (summary.total_time_ms / 1000.0).to_string() +
    " 秒 |\n"
  report = report +
    "| 平均准确率 | " +
    (summary.average_accuracy * 100.0).to_string() +
    "% |\n"
  report = report +
    "| 处理速度 | " +
    summary.average_pages_per_second.to_string() +
    " 页/秒 |\n"
  report = report +
    "| 识别速度 | " +
    summary.average_chars_per_second.to_string() +
    " 字符/秒 |\n\n"

  if summary.failed_tasks > 0 {
    report = report + "### 失败任务列表\n\n"
    for i in 0..<summary.failed_task_ids.length() {
      report = report +
        (i + 1).to_string() +
        ". " +
        summary.failed_task_ids[i] +
        "\n"
    }
    report = report + "\n"
  }

  report = report + "### 输出文件\n\n"
  for i in 0..<summary.output_files.length() {
    report = report +
      (i + 1).to_string() +
      ". " +
      summary.output_files[i] +
      "\n"
  }

  report
}

///|
/// 生成进度条字符串
pub fn progress_bar_to_string(progress : Double, width? : Int = 30) -> String {
  let bar_width = width
  let filled = (progress * bar_width.to_double()).to_int()
  let mut bar = "["
  for i in 0..<bar_width {
    if i < filled {
      bar = bar + "="
    } else if i == filled {
      bar = bar + ">"
    } else {
      bar = bar + " "
    }
  }
  bar = bar + "] " + (progress * 100.0).to_string() + "%"
  bar
}

///|
/// 估算内存使用（简化版）
pub fn estimate_memory_usage(
  image_count : Int,
  image_width : Int,
  image_height : Int,
  channels : Int,
) -> MemoryUsageStats {
  let per_image_mb = (image_width * image_height * channels).to_double() /
    (1024.0 * 1024.0)
  let current_usage = per_image_mb * 3.0 // 原图+预处理+二值化
  let peak_usage = per_image_mb * image_count.to_double() * 1.5
  MemoryUsageStats::{
    current_usage_mb: current_usage,
    peak_usage_mb: peak_usage,
    average_usage_mb: (current_usage + peak_usage) / 2.0,
    total_allocated: image_count * 3,
    total_freed: image_count * 2,
    gc_count: image_count,
  }
}
src\process\ocr\batch_processing.mbt

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