/************************************************************************************\ 
 *                                                                                  *
 * 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                           *
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#include "hip/hip_runtime.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#include <algorithm>
#include "../graph_parser/parse.h"
#include "../graph_parser/util.h"
#include "kernel.h"

#ifdef GEM5_FUSION
#include <stdint.h>
extern "C" {
void m5_work_begin(uint64_t workid, uint64_t threadid);
void m5_work_end(uint64_t workid, uint64_t threadid);
}
#endif

#define BIGNUM 99999999

void print_vector(int *vector, int num);

int main(int argc, char **argv)
{
    char *tmpchar;
    bool directed = 1;

    int num_nodes;
    int num_edges;
    int file_format = 1;

    hipError_t err = hipSuccess;

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

    // Allocate the csr structure
    csr_array *csr;

    // Parse the graph and store it into the CSR structure
    if (file_format == 1) {
        csr = parseMetis_transpose(tmpchar, &num_nodes, &num_edges, directed);
    } else if (file_format == 0) {
        csr = parseCOO_transpose(tmpchar, &num_nodes, &num_edges, directed);
    } else {
        printf("reserve for future");
        exit(1);
    }

    // Allocate ell and transform from csr
    ell_array *ell = csr2ell(csr, num_nodes, num_edges, BIGNUM);
    int height = ell->max_height;

    // Allocate the cost array
    int *cost_array = (int *)malloc(num_nodes * sizeof(int));
    if (!cost_array) fprintf(stderr, "malloc failed cost_array\n");

    // Set the cost array to zero
    for (int i = 0; i < num_nodes; i++) {
        cost_array[i] = 0;
    }

    // Create device-side buffers
    int *ell_col_d;
    int *ell_data_d;
    int *vector_d1;
    int *vector_d2;
    int *stop_d;

    // Create the device-side graph structure
    err = hipMalloc(&ell_col_d, height * num_nodes * sizeof(int));
    if (err != hipSuccess) {
        fprintf(stderr, "ERROR: hipMalloc ell_col_d (size:%d) => %s\n", height * num_nodes, hipGetErrorString(err));
        return -1;
    }
    err = hipMalloc(&ell_data_d, height * num_nodes * sizeof(int));
    if (err != hipSuccess) {
        fprintf(stderr, "ERROR: hipMalloc ell_data_d (size:%d) => %s\n", height * num_nodes, 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 the device-side buffers for sssp
    err = hipMalloc(&vector_d1, num_nodes * sizeof(int));
    if (err != hipSuccess) {
        fprintf(stderr, "ERROR: hipMalloc vector_d1 (size:%d) => %s\n", num_nodes, hipGetErrorString(err));
        return -1;
    }
    err = hipMalloc(&vector_d2, num_nodes * sizeof(int));
    if (err != hipSuccess) {
        fprintf(stderr, "ERROR: hipMalloc vector_d2 (size:%d) => %s\n", num_nodes, hipGetErrorString(err));
        return -1;
    }

    double timer1 = gettime();

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

    // Copy data to device side buffers
    err = hipMemcpy(ell_col_d, ell->col_array, height * num_nodes * sizeof(int), hipMemcpyHostToDevice);
    if (err != hipSuccess) {
        fprintf(stderr, "ERROR: hipMemcpy ell_col_d (size:%d) => %s\n", height * num_nodes, hipGetErrorString(err));
        return -1;
    }

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

    double timer3 = gettime();

    // Work dimensions
    int block_size = 64;
    int num_blocks = (num_nodes + block_size - 1) / block_size;

    dim3 threads(block_size, 1, 1);
    dim3 grid(num_blocks, 1, 1);

    // Source vertex 0
    int sourceVertex = 0;

    // Launch the initialization kernel
    hipLaunchKernelGGL(vector_init, dim3(grid), dim3(threads), 0, 0, vector_d1, vector_d2, sourceVertex, num_nodes);
    hipDeviceSynchronize();
    err = hipGetLastError();
    if (err != hipSuccess) {
        fprintf(stderr, "ERROR: vector_init failed (%s)\n", hipGetErrorString(err));
        return -1;
    }

    int stop = 1;
    int cnt = 0;
    // Main computation loop
    for (int i = 1; i < num_nodes; i++) {
        // Reset the termination variable
        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));
            return -1;
        }

        // Launch the assignment kernel
        hipLaunchKernelGGL(vector_assign, dim3(grid), dim3(threads), 0, 0, vector_d1, vector_d2, num_nodes);

        // Launch the min.+ kernel
        hipLaunchKernelGGL(ell_min_dot_plus_kernel, dim3(grid), dim3(threads), 0, 0, num_nodes, height,
                                                    ell_col_d, ell_data_d,
                                                    vector_d1, vector_d2);

        // Launch the check kernel
        hipLaunchKernelGGL(vector_diff, dim3(grid), dim3(threads), 0, 0, vector_d1, vector_d2,
                                        stop_d, num_nodes);

        // Read the termination variable back
        err = hipMemcpy(&stop, stop_d, sizeof(int), hipMemcpyDeviceToHost);
        if (err != hipSuccess) {
            fprintf(stderr, "ERROR: read stop_d (%s)\n", hipGetErrorString(err));
            return -1;
        }

        // Exit the loop
        if (stop == 0) {
            break;
        }
        cnt++;
    }
    hipDeviceSynchronize();
    double timer4 = gettime();

    // Read the cost_array back
    err = hipMemcpy(cost_array, vector_d1, num_nodes * sizeof(int), hipMemcpyDeviceToHost);
    if (err != hipSuccess) {
        fprintf(stderr, "ERROR: read vector_d1 (%s)\n", hipGetErrorString(err));
        return -1;
    }

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

    double timer2 = gettime();

    // Print the timing statistics
    printf("kernel + memcpy time = %lf ms\n", (timer2 - timer1) * 1000);
    printf("kernel time = %lf ms\n", (timer4 - timer3) * 1000);
    printf("number iterations = %d\n", cnt);

#if 1
    // Print cost_array
    print_vector(cost_array, num_nodes);
#endif

    // Clean up the host arrays
    free(cost_array);
    csr->freeArrays();
    free(csr);

    free(ell->col_array);
    free(ell->data_array);
    free(ell);

    // Clean up the device-side buffers
    hipFree(ell_col_d);
    hipFree(ell_data_d);
    hipFree(stop_d);
    hipFree(vector_d1);
    hipFree(vector_d2);

    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);
}