#ifndef ODE_RKV87E_BRIDGE_H_
#define ODE_RKV87E_BRIDGE_H_

#include "ode/ode_rkv87e.h"

class RxRkv87e : public ode::OdeRkv87e {
    t_dydt                  dydt_;
    int                    *full_neq_;
    rx_solving_options_ind *ind_;
    double                  t_stage_;
    long unsigned           max_steps_;

public:
    RxRkv87e(t_dydt dydt, int *full_neq, int neqOde,
            rx_solving_options_ind *ind, double *yp,
            long unsigned max_steps)
        : ode::OdeRkv87e((unsigned long)neqOde),
          dydt_(dydt), full_neq_(full_neq), ind_(ind),
          t_stage_(0.0), max_steps_(max_steps)
    {
        set_sol_external(yp);
    }

protected:
    void ode_fun(double * __restrict__ solin, double * __restrict__ fout) override {
        if (ind_->err != 0) {
            for (unsigned long i = 0; i < neq_; i++) fout[i] = 0.0;
            return;
        }
        dydt_(full_neq_, t_stage_, solin, fout);
        for (unsigned long i = 0; i < neq_; i++) {
            if (!std::isfinite(fout[i])) {
                ind_->err = 1;
                for (unsigned long j = 0; j < neq_; j++) fout[j] = 0.0;
                return;
            }
        }
    }



    void step_(double dt) override {
        // Stage 1
        t_stage_ = t_;
        ode_fun_(sol_, k_[0]);
        // Stage 2
        for (unsigned long i = 0; i < neq_; i++)
            soltemp_[i] = sol_[i] + dt * (a21*k_[0][i]);
        t_stage_ = t_ + c2 * dt;
        ode_fun_(soltemp_, k_[1]);
        // Stage 3
        for (unsigned long i = 0; i < neq_; i++)
            soltemp_[i] = sol_[i] + dt * (a31*k_[0][i] + a32*k_[1][i]);
        t_stage_ = t_ + c3 * dt;
        ode_fun_(soltemp_, k_[2]);
        // Stage 4
        for (unsigned long i = 0; i < neq_; i++)
            soltemp_[i] = sol_[i] + dt * (a41*k_[0][i] + a43*k_[2][i]);
        t_stage_ = t_ + c4 * dt;
        ode_fun_(soltemp_, k_[3]);
        // Stage 5
        for (unsigned long i = 0; i < neq_; i++)
            soltemp_[i] = sol_[i] + dt * (a51*k_[0][i] + a53*k_[2][i] + a54*k_[3][i]);
        t_stage_ = t_ + c5 * dt;
        ode_fun_(soltemp_, k_[4]);
        // Stage 6
        for (unsigned long i = 0; i < neq_; i++)
            soltemp_[i] = sol_[i] + dt * (a61*k_[0][i] + a64*k_[3][i] + a65*k_[4][i]);
        t_stage_ = t_ + c6 * dt;
        ode_fun_(soltemp_, k_[5]);
        // Stage 7
        for (unsigned long i = 0; i < neq_; i++)
            soltemp_[i] = sol_[i] + dt * (a71*k_[0][i] + a74*k_[3][i] + a75*k_[4][i] + a76*k_[5][i]);
        t_stage_ = t_ + c7 * dt;
        ode_fun_(soltemp_, k_[6]);
        // Stage 8
        for (unsigned long i = 0; i < neq_; i++)
            soltemp_[i] = sol_[i] + dt * (a81*k_[0][i] + a84*k_[3][i] + a85*k_[4][i] + a86*k_[5][i] + a87*k_[6][i]);
        t_stage_ = t_ + c8 * dt;
        ode_fun_(soltemp_, k_[7]);
        // Stage 9
        for (unsigned long i = 0; i < neq_; i++)
            soltemp_[i] = sol_[i] + dt * (a91*k_[0][i] + a94*k_[3][i] + a95*k_[4][i] + a96*k_[5][i] + a97*k_[6][i] + a98*k_[7][i]);
        t_stage_ = t_ + c9 * dt;
        ode_fun_(soltemp_, k_[8]);
        // Stage 10
        for (unsigned long i = 0; i < neq_; i++)
            soltemp_[i] = sol_[i] + dt * (a101*k_[0][i]+ a104*k_[3][i]+ a105*k_[4][i]+ a106*k_[5][i]+ a107*k_[6][i]+ a108*k_[7][i]+ a109*k_[8][i]);
        t_stage_ = t_ + c10 * dt;
        ode_fun_(soltemp_, k_[9]);
        // Stage 11
        for (unsigned long i = 0; i < neq_; i++)
            soltemp_[i] = sol_[i] + dt * (a111*k_[0][i]+ a114*k_[3][i]+ a115*k_[4][i]+ a116*k_[5][i]+ a117*k_[6][i]+ a118*k_[7][i]+ a119*k_[8][i]+ a1110*k_[9][i]);
        t_stage_ = t_ + c11 * dt;
        ode_fun_(soltemp_, k_[10]);
        // Stage 12
        for (unsigned long i = 0; i < neq_; i++)
            soltemp_[i] = sol_[i] + dt * (a121*k_[0][i]+ a124*k_[3][i]+ a125*k_[4][i]+ a126*k_[5][i]+ a127*k_[6][i]+ a128*k_[7][i]+ a129*k_[8][i]+ a1210*k_[9][i]+ a1211*k_[10][i]);
        t_stage_ = t_ + dt;
        ode_fun_(soltemp_, k_[11]);
        // Stage 13
        for (unsigned long i = 0; i < neq_; i++)
            soltemp_[i] = sol_[i] + dt * (a131*k_[0][i]+ a134*k_[3][i]+ a135*k_[4][i]+ a136*k_[5][i]+ a137*k_[6][i]+ a138*k_[7][i]+ a139*k_[8][i]+ a1310*k_[9][i]);
        t_stage_ = t_ + dt;
        ode_fun_(soltemp_, k_[12]);
        // Primary (higher-order) solution -> sol_
        for (unsigned long i = 0; i < neq_; i++)
            sol_[i] = sol_[i] + dt*(b1*k_[0][i] + b6*k_[5][i] + b7*k_[6][i] + b8*k_[7][i] + b9*k_[8][i] + b10*k_[9][i] + b11*k_[10][i] + b12*k_[11][i]);
        // Embedded (lower-order) solution -> solemb_
        for (unsigned long i = 0; i < neq_; i++)
            solemb_[i] = sol_[i] + dt * ((d1 - b1) * k_[0][i] + (d6 - b6) * k_[5][i] + (d7 - b7) * k_[6][i] + (d8 - b8) * k_[7][i] + (d9 - b9) * k_[8][i] + (d10 - b10) * k_[9][i] + (d11 - b11) * k_[10][i] + (d12 - b12) * k_[11][i] + (d13 - b13) * k_[12][i]);
    }

    void after_step(double) override {
        if (ind_->err != 0) throw std::runtime_error("rkv87e: ode error");
        if (nstep_ > max_steps_) {
            if (ind_->rc[0] == 0) ind_->rc[0] = -2019;
            ind_->err = 1;
            throw std::runtime_error("rkv87e: max steps exceeded");
        }
    }
};

#endif // ODE_RKV87E_BRIDGE_H_
