// Copyright 2020 The Tint Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#ifndef SRC_DIAGNOSTIC_FORMATTER_H_
#define SRC_DIAGNOSTIC_FORMATTER_H_

#include <string>

namespace tint {
namespace diag {

class Diagnostic;
class List;
class Printer;

/// Formatter are used to print a list of diagnostics messages.
class Formatter {
 public:
  /// Style controls the formatter's output style.
  struct Style {
    /// include the file path for each diagnostic
    bool print_file = true;
    /// include the severity for each diagnostic
    bool print_severity = true;
    /// include the source line(s) for the diagnostic
    bool print_line = true;
    /// print a newline at the end of a diagnostic list
    bool print_newline_at_end = true;
    /// width of a tab character
    size_t tab_width = 2u;
  };

  /// Constructor for the formatter using a default style.
  Formatter();

  /// Constructor for the formatter using the custom style.
  /// @param style the style used for the formatter.
  explicit Formatter(const Style& style);

  ~Formatter();

  /// @param list the list of diagnostic messages to format
  /// @param printer the printer used to display the formatted diagnostics
  void format(const List& list, Printer* printer) const;

  /// @return the list of diagnostics `list` formatted to a string.
  /// @param list the list of diagnostic messages to format
  std::string format(const List& list) const;

 private:
  struct State;

  void format(const Diagnostic& diag, State& state) const;

  const Style style_;
};

}  // namespace diag
}  // namespace tint

#endif  // SRC_DIAGNOSTIC_FORMATTER_H_