// Verilated -*- C++ -*-
// DESCRIPTION: Verilator output: main() simulation loop, created with --main

#include "Vcomputer___024root.h"
#include "Vcomputer_computer.h"
#include "Vcomputer_my_mem__D10_DB10000.h"
#include "verilated.h"
#include "Vcomputer.h"
#include <cinttypes>
#include <cstdint>
#include <cstdio>
#include <sched.h>

#include "../assembler/disas.h"

//======================

int main(int argc, char** argv, char**) {
    // Setup context, defaults, and parse command line
    Verilated::debug(0);
    const std::unique_ptr<VerilatedContext> contextp{new VerilatedContext};
    contextp->threads(1);
    contextp->commandArgs(argc, argv);

    // Construct the Verilated model, from Vtop.h generated from Verilating
    const std::unique_ptr<Vcomputer> topp{new Vcomputer{contextp.get(), ""}};

    if (argc != 2) {
        fprintf(stderr, "Usage: %.20s [filename]\n\n", argv[0]);
        exit(-1);
    }
    int i = 0;
    puts("Start simulation.");
    //topp->computer->clk_in = 0;
    topp->clk_in = 0;
    FILE* f = fopen(argv[1], "rb");
    if (!f) {
        fprintf(stderr, "Program file %.20s not found.\n", argv[1]);
        exit(-1);
    }
    fseek(f, 0, SEEK_END);
    long fpos = ftell(f);
    fseek(f, 0, SEEK_SET);
    size_t bytes_read = fread(
        topp->computer->ROM->r_datastore.m_storage,
        2,
        fpos/2,
        f
    );

    if (bytes_read * 2 != fpos) {
        fputs("Couldn't read program file completely.", stderr);
        exit(-1);
    }

    while (VL_LIKELY(!contextp->gotFinish()) && i < 100) {
        //topp->computer->clk_in = ~topp->computer->clk_in;
        topp->clk_in = !topp->clk_in;
        //uint16_t opcode = (topp->computer->PC_content_int & 0xff) << 8 | (topp->computer->PC_content_int >> 8);
        uint16_t opcode = topp->computer->PC_content_int;
        printf(
            "CLK1: %4d, CLK2: %4d, PC: @0x%04X, INS: 0x%04X\n",
            topp->clk_in,
            topp->computer->clk_in,
            topp->computer->PC_addr_int,
            opcode
        );
        // This is fucking dirty
#ifdef POPEN_PY
        {
            char command[128];
            snprintf(command, sizeof(command) - 1, "python3 ../assembler/disas_ins.py %04X", opcode);
            char buffer[256];
            FILE* pipe = popen(command, "r");
            if (!pipe) {
                perror("popen failed");
                exit(-1);
            }

            if (fgets(buffer, sizeof(buffer), pipe) != NULL) {
                printf("%s", buffer);
            }

            (void) pclose(pipe);
        }
#else
        {
            auto insline = print_decoded(opcode, true);
            printf("        %s\n", insline.c_str());
        }
#endif


        printf(
            "  A: 0x%04X, D: 0x%04X, M: 0x%04X, RES: 0x%04X\n",
            topp->computer->reg_A_int,
            topp->computer->reg_D_int,
            topp->computer->reg_pA_int,
            topp->computer->result_int
        );
        printf(
            "  A: %5" PRId16 ", D: %5" PRId16 ", M: %5" PRId16 ", RES: %5" PRId16 "\n",
            topp->computer->reg_A_int,
            topp->computer->reg_D_int,
            topp->computer->reg_pA_int,
            topp->computer->result_int
        );
        // Evaluate model
        topp->eval();
        // Advance time
        contextp->timeInc(1);
        i++;
        puts("-----");
    }
    puts("Simulation finished");

    if (VL_LIKELY(!contextp->gotFinish())) {
        VL_DEBUG_IF(VL_PRINTF("+ Exiting without $finish; no events left\n"););
    }

    // Execute 'final' processes
    topp->final();

    // Print statistical summary report
    //contextp->statsPrintSummary();

    return 0;
}