/************************************************************************************\ 
 *                                                                                  *
 * Copyright © 2014 Advanced Micro Devices, Inc.                                    *
 * Copyright (c) 2015 Mark D. Hill and David A. Wood                                *
 * Copyright (c) 2021 Gaurav Jain and Matthew D. Sinclair                           *
 * All rights reserved.                                                             *
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#include "hip/hip_runtime.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#include "../graph_parser/parse.h"
#include "../graph_parser/util.h"
#include "kernel_maxmin.h"

#ifdef GEM5_FUSION
#include <stdint.h>
#include <gem5/m5ops.h>
#endif

#define RANGE 2048

void print_vector(int *vector, int num);

int main(int argc, char **argv)
{
    char *tmpchar;

    int num_nodes;
    int num_edges;
    int file_format = 1;
    bool directed = 0;

    hipError_t err = hipSuccess;

    if (argc == 3) {
        tmpchar = argv[1];  //graph inputfile
        file_format = atoi(argv[2]); //graph format
    } else {
        fprintf(stderr, "You did something wrong!\n");
        exit(1);
    }

    srand(7);

    // Allocate the CSR structure
    csr_array *csr;

    // Parse graph file and store into a CSR format
    if (file_format == 1)
        csr = parseMetis(tmpchar, &num_nodes, &num_edges, directed);
    else if (file_format == 0)
        csr = parseCOO(tmpchar, &num_nodes, &num_edges, directed);
    else {
        printf("reserve for future");
        exit(1);
    }

    // Allocate the vertex value array
    int *node_value = (int *)malloc(num_nodes * sizeof(int));
    if (!node_value) fprintf(stderr, "node_value malloc failed\n");
    // Allocate the color array
    int *color = (int *)malloc(num_nodes * sizeof(int));
    if (!color) fprintf(stderr, "color malloc failed\n");

    // Initialize all the colors to -1
    // Randomize the value for each vertex
    for (int i = 0; i < num_nodes; i++) {
        color[i] = -1;
        node_value[i] = rand() % RANGE;
    }

    int *row_d;
    int *col_d;
    int *max_d;
    int *min_d;

    int *color_d;
    int *node_value_d;
    int *stop_d;

    // Create device-side buffers for the graph
    err = hipMalloc(&row_d, num_nodes * sizeof(int));
    if (err != hipSuccess) {
        fprintf(stderr, "ERROR: hipMalloc row_d (size:%d) => %s\n",  num_nodes , hipGetErrorString(err));
        return -1;
    }
    err = hipMalloc(&col_d, num_edges * sizeof(int));
    if (err != hipSuccess) {
        fprintf(stderr, "ERROR: hipMalloc col_d (size:%d): %s\n",  num_edges , hipGetErrorString(err));
        return -1;
    }

    // Termination variable
    err = hipMalloc(&stop_d, sizeof(int));
    if (err != hipSuccess) {
        fprintf(stderr, "ERROR: hipMalloc stop_d (size:%d) => %s\n",  1 , hipGetErrorString(err));
        return -1;
    }

    // Create device-side buffers for color
    err = hipMalloc(&color_d, num_nodes * sizeof(int));
    if (err != hipSuccess) {
        fprintf(stderr, "ERROR: hipMalloc color_d (size:%d) => %s\n", num_nodes , hipGetErrorString(err));
        return -1;
    }
    err = hipMalloc(&node_value_d, num_nodes * sizeof(int));
    if (err != hipSuccess) {
        fprintf(stderr, "ERROR: hipMalloc node_value_d (size:%d) => %s\n", num_nodes , hipGetErrorString(err));
        return -1;
    }
    err = hipMalloc(&max_d, num_nodes * sizeof(int));
    if (err != hipSuccess) {
        fprintf(stderr, "ERROR: hipMalloc max_d (size:%d) => %s\n",  num_nodes , hipGetErrorString(err));
        return -1;
    }
    err = hipMalloc(&min_d, num_nodes * sizeof(int));
    if (err != hipSuccess) {
        fprintf(stderr, "ERROR: hipMalloc min_d (size:%d) => %s\n",  num_nodes , hipGetErrorString(err));
        return -1;
    }

    // Copy data to device-side buffers
    double timer1 = gettime();

#ifdef GEM5_FUSION
    m5_work_begin(0, 0);
#endif

    err = hipMemcpy(color_d, color, num_nodes * sizeof(int), hipMemcpyHostToDevice);
    if (err != hipSuccess) {
        fprintf(stderr, "ERROR: hipMemcpy color_d (size:%d) => %s\n", num_nodes, hipGetErrorString(err));
        return -1;
    }

    err = hipMemcpy(row_d, csr->row_array, num_nodes * sizeof(int), hipMemcpyHostToDevice);
    if (err != hipSuccess) {
        fprintf(stderr, "ERROR: hipMemcpy row_d (size:%d) => %s\n", num_nodes, hipGetErrorString(err));
        return -1;
    }

    err = hipMemcpy(col_d, csr->col_array, num_edges * sizeof(int), hipMemcpyHostToDevice);
    if (err != hipSuccess) {
        fprintf(stderr, "ERROR: hipMemcpy col_d (size:%d) => %s\n", num_nodes, hipGetErrorString(err));
        return -1;
    }

    err = hipMemcpy(node_value_d, node_value, num_nodes * sizeof(int), hipMemcpyHostToDevice);
    if (err != hipSuccess) {
        fprintf(stderr, "ERROR: hipMemcpy node_value_d (size:%d) => %s\n", num_nodes, hipGetErrorString(err));
        return -1;
    }

    int block_size = 256;
    int num_blocks = (num_nodes + block_size - 1) / block_size;

    // Set up kernel dimensions
    dim3 threads(block_size,  1, 1);
    dim3 grid(num_blocks, 1,  1);

    int stop = 1;
    int graph_color = 1;

    // Initialize arrays
    hipLaunchKernelGGL(ini, dim3(grid), dim3(threads ), 0, 0, max_d, min_d, num_nodes);

    // Main computation loop
    double timer3 = gettime();

    while (stop) {

        stop = 0;

        // Copy the termination variable to the device
        err = hipMemcpy(stop_d, &stop, sizeof(int), hipMemcpyHostToDevice);
        if (err != hipSuccess) {
            fprintf(stderr, "ERROR: write stop_d: %s\n", hipGetErrorString(err));
        }

        // Launch the color kernel 1
        hipLaunchKernelGGL(color1, dim3(grid), dim3(threads ), 0, 0, row_d, col_d, node_value_d, color_d,
                                     stop_d, max_d, min_d, graph_color,
                                     num_nodes, num_edges);

        // Launch the color kernel 2
        hipLaunchKernelGGL(color2, dim3(grid), dim3(threads ), 0, 0, node_value_d, color_d, max_d, min_d,
                                     graph_color, num_nodes, num_edges);

        err = hipMemcpy(&stop, stop_d, sizeof(int), hipMemcpyDeviceToHost);
        if (err != hipSuccess) {
            fprintf(stderr, "ERROR: read stop_d: %s\n", hipGetErrorString(err));
        }

        // Update the color label for the next iter
        graph_color = graph_color + 2;

    }
    hipDeviceSynchronize();

    double timer4 = gettime();

    // Copy back the color array
    err = hipMemcpy(color, color_d, num_nodes * sizeof(int), hipMemcpyDeviceToHost);
    if (err != hipSuccess) {
        printf("ERROR: hipMemcpy(): %s\n", hipGetErrorString(err));
        return -1;
    }

#ifdef GEM5_FUSION
    m5_work_end(0, 0);
#endif

    double timer2 = gettime();

    // Print out color and timing statistics
    printf("total number of colors used: %d\n", graph_color);
    printf("kernel time = %lf ms\n", (timer4 - timer3) * 1000);
    printf("kernel + memcpy time = %lf ms\n", (timer2 - timer1) * 1000);

#if 1
    // Dump the color array into an output file
    print_vector(color, num_nodes);
#endif

    // Free host-side buffers
    free(node_value);
    free(color);
    csr->freeArrays();
    free(csr);

    // Free CUDA buffers
    hipFree(row_d);
    hipFree(col_d);
    hipFree(max_d);
    hipFree(color_d);
    hipFree(node_value_d);
    hipFree(stop_d);

    return 0;

}

void print_vector(int *vector, int num)
{
    FILE * fp = fopen("result.out", "w");
    if (!fp) {
        printf("ERROR: unable to open result.txt\n");
    }

    for (int i = 0; i < num; i++)
        fprintf(fp, "%d: %d\n", i + 1, vector[i]);

    fclose(fp);
}