#ifndef STAN_MATH_PRIM_MAT_FUN_GET_BASE1_LHS_HPP
#define STAN_MATH_PRIM_MAT_FUN_GET_BASE1_LHS_HPP

#include <stan/math/prim/mat/fun/Eigen.hpp>
#include <stan/math/prim/mat/err/check_range.hpp>
#include <vector>

namespace stan {
  namespace math {

    /**
     * Return a reference to the value of the specified vector at the
     * specified base-one index.  If the index is out of range, throw
     * a <code>std::out_of_range</code> exception with the specified
     * error message and index indicated.
     *
     * @param x Vector from which to get a value.
     * @param i Index into vector plus 1.
     * @param error_msg Error message if the index is out of range.
     * @param idx Nested index level to report in error message if
     * the index is out of range.
     * @return Value of vector at <code>i - 1</code>
     * @tparam T type of value.
     * @throw std::out_of_range if idx is out of range.     
     */
    template <typename T>
    inline
    T& get_base1_lhs(std::vector<T>& x,
                     size_t i,
                     const char* error_msg,
                     size_t idx) {
      check_range("[]", "x", x.size(), i, idx, error_msg);
      return x[i - 1];
    }

    /**
     * Return a reference to the value of the specified vector at the
     * specified base-one indexes.  If an index is out of range, throw
     * a <code>std::out_of_range</code> exception with the specified
     * error message and index indicated.
     *
     * @param x Vector from which to get a value.
     * @param i1 First index plus 1.
     * @param i2 Second index plus 1.
     * @param error_msg Error message if an index is out of range.
     * @param idx Nested index level to report in error message if
     * the index is out of range.
     * @return Value of vector at indexes.
     * @tparam T type of value.
     * @throw std::out_of_range if idx is out of range.
     */
    template <typename T>
    inline
    T& get_base1_lhs(std::vector<std::vector<T> >& x,
                     size_t i1,
                     size_t i2,
                     const char* error_msg,
                     size_t idx) {
      check_range("[]", "x", x.size(), i1, idx, error_msg);
      return get_base1_lhs(x[i1 - 1], i2, error_msg, idx+1);
    }

    /**
     * Return a reference to the value of the specified vector at the
     * specified base-one indexes.  If an index is out of range, throw
     * a <code>std::out_of_range</code> exception with the specified
     * error message and index indicated.
     *
     * @param x Vector from which to get a value.
     * @param i1 First index plus 1.
     * @param i2 Second index plus 1.
     * @param i3 Third index plus 1.
     * @param error_msg Error message if an index is out of range.
     * @param idx Nested index level to report in error message if
     * the index is out of range.
     * @return Value of vector at indexes.
     * @tparam T type of value.
     * @throw std::out_of_range if idx is out of range.
     */
    template <typename T>
    inline
    T& get_base1_lhs(std::vector<std::vector<std::vector<T> > >& x,
                     size_t i1,
                     size_t i2,
                     size_t i3,
                     const char* error_msg,
                     size_t idx) {
      check_range("[]", "x", x.size(), i1, idx, error_msg);
      return get_base1_lhs(x[i1 - 1], i2, i3, error_msg, idx + 1);
    }

    /**
     * Return a reference to the value of the specified vector at the
     * specified base-one indexes.  If an index is out of range, throw
     * a <code>std::out_of_range</code> exception with the specified
     * error message and index indicated.
     *
     * @param x Vector from which to get a value.
     * @param i1 First index plus 1.
     * @param i2 Second index plus 1.
     * @param i3 Third index plus 1.
     * @param i4 Fourth index plus 1.
     * @param error_msg Error message if an index is out of range.
     * @param idx Nested index level to report in error message if
     * the index is out of range.
     * @return Value of vector at indexes.
     * @tparam T type of value.
     * @throw std::out_of_range if idx is out of range.
     */
    template <typename T>
    inline
    T& get_base1_lhs(std::vector<std::vector<std::vector
                     <std::vector<T> > > >& x,
                     size_t i1,
                     size_t i2,
                     size_t i3,
                     size_t i4,
                     const char* error_msg,
                     size_t idx) {
      check_range("[]", "x", x.size(), i1, idx, error_msg);
      return get_base1_lhs(x[i1 - 1], i2, i3, i4, error_msg, idx + 1);
    }

    /**
     * Return a reference to the value of the specified vector at the
     * specified base-one indexes.  If an index is out of range, throw
     * a <code>std::out_of_range</code> exception with the specified
     * error message and index indicated.
     *
     * @param x Vector from which to get a value.
     * @param i1 First index plus 1.
     * @param i2 Second index plus 1.
     * @param i3 Third index plus 1.
     * @param i4 Fourth index plus 1.
     * @param i5 Fifth index plus 1.
     * @param error_msg Error message if an index is out of range.
     * @param idx Nested index level to report in error message if
     * the index is out of range.
     * @return Value of vector at indexes.
     * @tparam T type of value.
     * @throw std::out_of_range if idx is out of range.
     */
    template <typename T>
    inline
    T& get_base1_lhs(std::vector<std::vector<std::vector<std::vector
                     <std::vector<T> > > > >& x,
                     size_t i1,
                     size_t i2,
                     size_t i3,
                     size_t i4,
                     size_t i5,
                     const char* error_msg,
                     size_t idx) {
      check_range("[]", "x", x.size(), i1, idx, error_msg);
      return get_base1_lhs(x[i1 - 1], i2, i3, i4, i5, error_msg, idx + 1);
    }

    /**
     * Return a reference to the value of the specified vector at the
     * specified base-one indexes.  If an index is out of range, throw
     * a <code>std::out_of_range</code> exception with the specified
     * error message and index indicated.
     *
     * @param x Vector from which to get a value.
     * @param i1 First index plus 1.
     * @param i2 Second index plus 1.
     * @param i3 Third index plus 1.
     * @param i4 Fourth index plus 1.
     * @param i5 Fifth index plus 1.
     * @param i6 Sixth index plus 1.
     * @param error_msg Error message if an index is out of range.
     * @param idx Nested index level to report in error message if
     * the index is out of range.
     * @return Value of vector at indexes.
     * @tparam T type of value.
     * @throw std::out_of_range if idx is out of range.
     */
    template <typename T>
    inline
    T& get_base1_lhs(std::vector<std::vector<std::vector<std::vector
                     <std::vector<std::vector<T> > > > > >& x,
                     size_t i1,
                     size_t i2,
                     size_t i3,
                     size_t i4,
                     size_t i5,
                     size_t i6,
                     const char* error_msg,
                     size_t idx) {
      check_range("[]", "x", x.size(), i1, idx, error_msg);
      return get_base1_lhs(x[i1 - 1], i2, i3, i4, i5, i6, error_msg, idx + 1);
    }

    /**
     * Return a reference to the value of the specified vector at the
     * specified base-one indexes.  If an index is out of range, throw
     * a <code>std::out_of_range</code> exception with the specified
     * error message and index indicated.
     *
     * @param x Vector from which to get a value.
     * @param i1 First index plus 1.
     * @param i2 Second index plus 1.
     * @param i3 Third index plus 1.
     * @param i4 Fourth index plus 1.
     * @param i5 Fifth index plus 1.
     * @param i6 Sixth index plus 1.
     * @param i7 Seventh index plus 1.
     * @param error_msg Error message if an index is out of range.
     * @param idx Nested index level to report in error message if
     * the index is out of range.
     * @return Value of vector at indexes.
     * @tparam T type of value.
     * @throw std::out_of_range if idx is out of range.
     */
    template <typename T>
    inline
    T& get_base1_lhs(std::vector<std::vector<std::vector<std::vector
                     <std::vector<std::vector
                     <std::vector<T> > > > > > >& x,
                     size_t i1,
                     size_t i2,
                     size_t i3,
                     size_t i4,
                     size_t i5,
                     size_t i6,
                     size_t i7,
                     const char* error_msg,
                     size_t idx) {
      check_range("[]", "x", x.size(), i1, idx, error_msg);
      return get_base1_lhs(x[i1 - 1], i2, i3, i4, i5, i6, i7, error_msg,
                           idx + 1);
    }

    /**
     * Return a reference to the value of the specified vector at the
     * specified base-one indexes.  If an index is out of range, throw
     * a <code>std::out_of_range</code> exception with the specified
     * error message and index indicated.
     *
     * @param x Vector from which to get a value.
     * @param i1 First index plus 1.
     * @param i2 Second index plus 1.
     * @param i3 Third index plus 1.
     * @param i4 Fourth index plus 1.
     * @param i5 Fifth index plus 1.
     * @param i6 Sixth index plus 1.
     * @param i7 Seventh index plus 1.
     * @param i8 Eigth index plus 1.
     * @param error_msg Error message if an index is out of range.
     * @param idx Nested index level to report in error message if
     * the index is out of range.
     * @return Value of vector at indexes.
     * @tparam T type of value.
     * @throw std::out_of_range if idx is out of range.
     */
    template <typename T>
    inline
    T& get_base1_lhs(std::vector<std::vector<std::vector<std::vector
                     <std::vector<std::vector<std::vector
                     <std::vector<T> > > > > > > >& x,
                     size_t i1,
                     size_t i2,
                     size_t i3,
                     size_t i4,
                     size_t i5,
                     size_t i6,
                     size_t i7,
                     size_t i8,
                     const char* error_msg,
                     size_t idx) {
      check_range("[]", "x", x.size(), i1, idx, error_msg);
      return get_base1_lhs(x[i1 - 1], i2, i3, i4, i5, i6, i7, i8,
                           error_msg, idx + 1);
    }

    /**
     * Return a copy of the row of the specified vector at the specified
     * base-one row index.  If the index is out of range, throw a
     * <code>std::out_of_range</code> exception with the specified
     * error message and index indicated.
     *
     * <b>Warning</b>:  Because a copy is involved, it is inefficient
     * to access element of matrices by first using this method
     * to get a row then using a second call to get the value at
     a specified column.
     *
     * @param x Matrix from which to get a row
     * @param m Index into matrix plus 1.
     * @param error_msg Error message if the index is out of range.
     * @param idx Nested index level to report in error message if
     * the index is out of range.
     * @return Row of matrix at <code>i - 1</code>.
     * @tparam T type of value.
     * @throw std::out_of_range if idx is out of range.
     */
    template <typename T>
    inline
    Eigen::Block<Eigen::Matrix<T, Eigen::Dynamic, Eigen::Dynamic> >
    get_base1_lhs(Eigen::Matrix<T, Eigen::Dynamic, Eigen::Dynamic>& x,
                  size_t m,
                  const char* error_msg,
                  size_t idx) {
      check_range("[]", "rows of x", x.rows(), m, idx, error_msg);
      return x.block(m - 1, 0, 1, x.cols());
    }

    /**
     * Return a reference to the value of the specified matrix at the specified
     * base-one row and column indexes.  If either index is out of range,
     * throw a <code>std::out_of_range</code> exception with the
     * specified error message and index indicated.
     *
     * @param x Matrix from which to get a row
     * @param m Row index plus 1.
     * @param n Column index plus 1.
     * @param error_msg Error message if either index is out of range.
     * @param idx Nested index level to report in error message if
     * either index is out of range.
     * @return Value of matrix at row <code>m - 1</code> and column
     * <code>n - 1</code>.
     * @tparam T type of value.
     * @throw std::out_of_range if idx is out of range.
     */
    template <typename T>
    inline
    T& get_base1_lhs(Eigen::Matrix<T, Eigen::Dynamic, Eigen::Dynamic>& x,
                     size_t m,
                     size_t n,
                     const char* error_msg,
                     size_t idx) {
      check_range("[]", "rows of x", x.rows(), m, idx, error_msg);
      check_range("[]", "cols of x", x.cols(), n, idx + 1, error_msg);
      return x(m - 1, n - 1);
    }

    /**
     * Return a reference to the value of the specified column vector
     * at the specified base-one index.  If the index is out of range,
     * throw a <code>std::out_of_range</code> exception with the
     * specified error message and index indicated.
     *
     * @param x Column vector from which to get a value.
     * @param m Row index plus 1.
     * @param error_msg Error message if the index is out of range.
     * @param idx Nested index level to report in error message if
     * the index is out of range.
     * @return Value of column vector at row <code>m - 1</code>.
     * @tparam T type of value.
     * @throw std::out_of_range if idx is out of range.
     */
    template <typename T>
    inline
    T& get_base1_lhs(Eigen::Matrix<T, Eigen::Dynamic, 1>& x,
                     size_t m,
                     const char* error_msg,
                     size_t idx) {
      check_range("[]", "x", x.size(), m, idx, error_msg);
      return x(m - 1);
    }

    /**
     * Return a reference to the value of the specified row vector
     * at the specified base-one index.  If the index is out of range,
     * throw a <code>std::out_of_range</code> exception with the
     * specified error message and index indicated.
     *
     * @param x Row vector from which to get a value.
     * @param n Column index plus 1.
     * @param error_msg Error message if the index is out of range.
     * @param idx Nested index level to report in error message if
     * the index is out of range.
     * @return Value of row vector at column <code>n - 1</code>.
     * @tparam T type of value.
     * @throw std::out_of_range if idx is out of range.
     */
    template <typename T>
    inline
    T& get_base1_lhs(Eigen::Matrix<T, 1, Eigen::Dynamic>& x,
                     size_t n,
                     const char* error_msg,
                     size_t idx) {
      check_range("[]", "x", x.size(), n, idx, error_msg);
      return x(n - 1);
    }

  }
}
#endif
