// Copyright 2022 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_TINT_TYPE_MATRIX_H_
#define SRC_TINT_TYPE_MATRIX_H_

#include <string>

#include "src/tint/type/vector.h"

// Forward declarations
namespace tint::type {
class Vector;
}  // namespace tint::type

namespace tint::type {

/// A matrix type
class Matrix final : public utils::Castable<Matrix, Type> {
  public:
    /// Constructor
    /// @param column_type the type of a column of the matrix
    /// @param columns the number of columns in the matrix
    Matrix(const Vector* column_type, uint32_t columns);

    /// Destructor
    ~Matrix() override;

    /// @param other the other node to compare against
    /// @returns true if the this type is equal to @p other
    bool Equals(const UniqueNode& other) const override;

    /// @returns the type of the matrix
    const Type* type() const { return subtype_; }
    /// @returns the number of rows in the matrix
    uint32_t rows() const { return rows_; }
    /// @returns the number of columns in the matrix
    uint32_t columns() const { return columns_; }

    /// @returns the column-vector type of the matrix
    const Vector* ColumnType() const { return column_type_; }

    /// @returns the name for this type that closely resembles how it would be
    /// declared in WGSL.
    std::string FriendlyName() const override;

    /// @returns the size in bytes of the type. This may include tail padding.
    uint32_t Size() const override;

    /// @returns the alignment in bytes of the type. This may include tail
    /// padding.
    uint32_t Align() const override;

    /// @returns the number of bytes between columns of the matrix
    uint32_t ColumnStride() const;

    /// @copydoc Type::Elements
    TypeAndCount Elements(const Type* type_if_invalid = nullptr,
                          uint32_t count_if_invalid = 0) const override;

    /// @copydoc Type::Element
    const Vector* Element(uint32_t index) const override;

    /// @param ctx the clone context
    /// @returns a clone of this type
    Matrix* Clone(CloneContext& ctx) const override;

  private:
    const Type* const subtype_;
    const Vector* const column_type_;
    const uint32_t rows_;
    const uint32_t columns_;
};

}  // namespace tint::type

#endif  // SRC_TINT_TYPE_MATRIX_H_