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#ifndef SRC_TINT_UTILS_DIAGNOSTIC_FORMATTER_H_
#define SRC_TINT_UTILS_DIAGNOSTIC_FORMATTER_H_

#include <string>

namespace tint::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;
    /// deprecated, use `Format`
    std::string format(const List& list) const { return Format(list); }

  private:
    struct State;

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

    const Style style_;
};

}  // namespace tint::diag

#endif  // SRC_TINT_UTILS_DIAGNOSTIC_FORMATTER_H_