#include <stdio.h>
#include <time.h>
#include <assert.h>
#include "network.h"
#include "image.h"
#include "data.h"
#include "utils.h"
#include "blas.h"

#include "crop_layer.h"
#include "connected_layer.h"
#include "gru_layer.h"
#include "rnn_layer.h"
#include "crnn_layer.h"
#include "local_layer.h"
#include "convolutional_layer.h"
#include "activation_layer.h"
#include "detection_layer.h"
#include "region_layer.h"
#include "normalization_layer.h"
#include "batchnorm_layer.h"
#include "maxpool_layer.h"
#include "reorg_layer.h"
#include "avgpool_layer.h"
#include "cost_layer.h"
#include "softmax_layer.h"
#include "dropout_layer.h"
#include "route_layer.h"
#include "shortcut_layer.h"
#include "parser.h"
#include "data.h"

load_args get_base_args(network net)
{
    load_args args = {0};
    args.w = net.w;
    args.h = net.h;
    args.size = net.w;

    args.min = net.min_crop;
    args.max = net.max_crop;
    args.angle = net.angle;
    args.aspect = net.aspect;
    args.exposure = net.exposure;
    args.center = net.center;
    args.saturation = net.saturation;
    args.hue = net.hue;
    return args;
}

network load_network(char *cfg, char *weights, int clear)
{
    network net = parse_network_cfg(cfg);
    if(weights && weights[0] != 0){
        load_weights(&net, weights);
    }
    if(clear) *net.seen = 0;
    return net;
}

network *load_network_p(char *cfg, char *weights, int clear)
{
    network *net = calloc(1, sizeof(network));
    *net = load_network(cfg, weights, clear);
    return net;
}

size_t get_current_batch(network net)
{
    size_t batch_num = (*net.seen)/(net.batch*net.subdivisions);
    return batch_num;
}

void reset_momentum(network net)
{
    if (net.momentum == 0) return;
    net.learning_rate = 0;
    net.momentum = 0;
    net.decay = 0;
    #ifdef GPU
        //if(net.gpu_index >= 0) update_network_gpu(net);
    #endif
}

float get_current_rate(network net)
{
    size_t batch_num = get_current_batch(net);
    int i;
    float rate;
    if (batch_num < net.burn_in) return net.learning_rate * pow((float)batch_num / net.burn_in, net.power);
    switch (net.policy) {
        case CONSTANT:
            return net.learning_rate;
        case STEP:
            return net.learning_rate * pow(net.scale, batch_num/net.step);
        case STEPS:
            rate = net.learning_rate;
            for(i = 0; i < net.num_steps; ++i){
                if(net.steps[i] > batch_num) return rate;
                rate *= net.scales[i];
                //if(net.steps[i] > batch_num - 1 && net.scales[i] > 1) reset_momentum(net);
            }
            return rate;
        case EXP:
            return net.learning_rate * pow(net.gamma, batch_num);
        case POLY:
            return net.learning_rate * pow(1 - (float)batch_num / net.max_batches, net.power);
        case RANDOM:
            return net.learning_rate * pow(rand_uniform(0,1), net.power);
        case SIG:
            return net.learning_rate * (1./(1.+exp(net.gamma*(batch_num - net.step))));
        default:
            fprintf(stderr, "Policy is weird!\n");
            return net.learning_rate;
    }
}

char *get_layer_string(LAYER_TYPE a)
{
    switch(a){
        case CONVOLUTIONAL:
            return "convolutional";
        case ACTIVE:
            return "activation";
        case LOCAL:
            return "local";
        case DECONVOLUTIONAL:
            return "deconvolutional";
        case CONNECTED:
            return "connected";
        case RNN:
            return "rnn";
        case GRU:
            return "gru";
        case LSTM:
	    return "lstm";
        case CRNN:
            return "crnn";
        case MAXPOOL:
            return "maxpool";
        case REORG:
            return "reorg";
        case AVGPOOL:
            return "avgpool";
        case SOFTMAX:
            return "softmax";
        case DETECTION:
            return "detection";
        case REGION:
            return "region";
        case DROPOUT:
            return "dropout";
        case CROP:
            return "crop";
        case COST:
            return "cost";
        case ROUTE:
            return "route";
        case SHORTCUT:
            return "shortcut";
        case NORMALIZATION:
            return "normalization";
        case BATCHNORM:
            return "batchnorm";
        default:
            break;
    }
    return "none";
}

network make_network(int n)
{
    network net = {0};
    net.n = n;
    net.layers = calloc(net.n, sizeof(layer));
    net.seen = calloc(1, sizeof(int));
    net.t    = calloc(1, sizeof(int));
    net.cost = calloc(1, sizeof(float));
    return net;
}

void forward_network(network net)
{
    int i;
    for(i = 0; i < net.n; ++i){
        net.index = i;
        layer l = net.layers[i];
        if(l.delta){
            fill_cpu(l.outputs * l.batch, 0, l.delta, 1);
        }
        l.forward(l, net);
        net.input = l.output;
        if(l.truth) {
            net.truth = l.output;
        }
    }
    calc_network_cost(net);
}

void update_network(network net)
{
    int i;
    update_args a = {0};
    a.batch = net.batch*net.subdivisions;
    a.learning_rate = get_current_rate(net);
    a.momentum = net.momentum;
    a.decay = net.decay;
    a.adam = net.adam;
    a.B1 = net.B1;
    a.B2 = net.B2;
    a.eps = net.eps;
    ++*net.t;
    a.t = *net.t;

    for(i = 0; i < net.n; ++i){
        layer l = net.layers[i];
        if(l.update){
            l.update(l, a);
        }
    }
}

void calc_network_cost(network net)
{
    int i;
    float sum = 0;
    int count = 0;
    for(i = 0; i < net.n; ++i){
        if(net.layers[i].cost){
            sum += net.layers[i].cost[0];
            ++count;
        }
    }
    *net.cost = sum/count;
}

int get_predicted_class_network(network net)
{
    return max_index(net.output, net.outputs);
}

void backward_network(network net)
{
    int i;
    network orig = net;
    for(i = net.n-1; i >= 0; --i){
        layer l = net.layers[i];
        if(l.stopbackward) break;
        if(i == 0){
            net = orig;
        }else{
            layer prev = net.layers[i-1];
            net.input = prev.output;
            net.delta = prev.delta;
        }
        net.index = i;
        l.backward(l, net);
    }
}

float train_network_datum(network net)
{
#ifdef GPU
    if(gpu_index >= 0) return train_network_datum_gpu(net);
#endif
    *net.seen += net.batch;
    net.train = 1;
    forward_network(net);
    backward_network(net);
    float error = *net.cost;
    if(((*net.seen)/net.batch)%net.subdivisions == 0) update_network(net);
    return error;
}

float train_network_sgd(network net, data d, int n)
{
    int batch = net.batch;

    int i;
    float sum = 0;
    for(i = 0; i < n; ++i){
        get_random_batch(d, batch, net.input, net.truth);
        float err = train_network_datum(net);
        sum += err;
    }
    return (float)sum/(n*batch);
}

float train_network(network net, data d)
{
    assert(d.X.rows % net.batch == 0);
    int batch = net.batch;
    int n = d.X.rows / batch;

    int i;
    float sum = 0;
    for(i = 0; i < n; ++i){
        get_next_batch(d, batch, i*batch, net.input, net.truth);
        float err = train_network_datum(net);
        sum += err;
    }
    return (float)sum/(n*batch);
}

void set_batch_network(network *net, int b)
{
    net->batch = b;
    int i;
    for(i = 0; i < net->n; ++i){
        net->layers[i].batch = b;
#ifdef CUDNN
        if(net->layers[i].type == CONVOLUTIONAL){
            cudnn_convolutional_setup(net->layers + i);
        }
#endif
    }
}

int resize_network(network *net, int w, int h)
{
#ifdef GPU
    cuda_set_device(net->gpu_index);
    cuda_free(net->workspace);
#endif
    int i;
    //if(w == net->w && h == net->h) return 0;
    net->w = w;
    net->h = h;
    int inputs = 0;
    size_t workspace_size = 0;
    //fprintf(stderr, "Resizing to %d x %d...\n", w, h);
    //fflush(stderr);
    for (i = 0; i < net->n; ++i){
        layer l = net->layers[i];
        if(l.type == CONVOLUTIONAL){
            resize_convolutional_layer(&l, w, h);
        }else if(l.type == CROP){
            resize_crop_layer(&l, w, h);
        }else if(l.type == MAXPOOL){
            resize_maxpool_layer(&l, w, h);
        }else if(l.type == REGION){
            resize_region_layer(&l, w, h);
        }else if(l.type == ROUTE){
            resize_route_layer(&l, net);
        }else if(l.type == REORG){
            resize_reorg_layer(&l, w, h);
        }else if(l.type == AVGPOOL){
            resize_avgpool_layer(&l, w, h);
        }else if(l.type == NORMALIZATION){
            resize_normalization_layer(&l, w, h);
        }else if(l.type == COST){
            resize_cost_layer(&l, inputs);
        }else{
            error("Cannot resize this type of layer");
        }
        if(l.workspace_size > workspace_size) workspace_size = l.workspace_size;
        inputs = l.outputs;
        net->layers[i] = l;
        w = l.out_w;
        h = l.out_h;
        if(l.type == AVGPOOL) break;
    }
    layer out = get_network_output_layer(*net);
    net->inputs = net->layers[0].inputs;
    net->outputs = out.outputs;
    net->truths = out.outputs;
    if(net->layers[net->n-1].truths) net->truths = net->layers[net->n-1].truths;
    net->output = out.output;
    free(net->input);
    free(net->truth);
    net->input = calloc(net->inputs*net->batch, sizeof(float));
    net->truth = calloc(net->truths*net->batch, sizeof(float));
#ifdef GPU
    if(gpu_index >= 0){
        cuda_free(net->input_gpu);
        cuda_free(net->truth_gpu);
        net->input_gpu = cuda_make_array(net->input, net->inputs*net->batch);
        net->truth_gpu = cuda_make_array(net->truth, net->truths*net->batch);
        net->workspace = cuda_make_array(0, (workspace_size-1)/sizeof(float)+1);
    }else {
        free(net->workspace);
        net->workspace = calloc(1, workspace_size);
    }
#else
    free(net->workspace);
    net->workspace = calloc(1, workspace_size);
#endif
    //fprintf(stderr, " Done!\n");
    return 0;
}

detection_layer get_network_detection_layer(network net)
{
    int i;
    for(i = 0; i < net.n; ++i){
        if(net.layers[i].type == DETECTION){
            return net.layers[i];
        }
    }
    fprintf(stderr, "Detection layer not found!!\n");
    detection_layer l = {0};
    return l;
}

image get_network_image_layer(network net, int i)
{
    layer l = net.layers[i];
#ifdef GPU
    //cuda_pull_array(l.output_gpu, l.output, l.outputs);
#endif
    if (l.out_w && l.out_h && l.out_c){
        return float_to_image(l.out_w, l.out_h, l.out_c, l.output);
    }
    image def = {0};
    return def;
}

image get_network_image(network net)
{
    int i;
    for(i = net.n-1; i >= 0; --i){
        image m = get_network_image_layer(net, i);
        if(m.h != 0) return m;
    }
    image def = {0};
    return def;
}

void visualize_network(network net)
{
    image *prev = 0;
    int i;
    char buff[256];
    for(i = 0; i < net.n; ++i){
        sprintf(buff, "Layer %d", i);
        layer l = net.layers[i];
        if(l.type == CONVOLUTIONAL){
            prev = visualize_convolutional_layer(l, buff, prev);
        }
    } 
}

void top_predictions(network net, int k, int *index)
{
    top_k(net.output, net.outputs, k, index);
}


float *network_predict(network net, float *input)
{
#ifdef GPU
    if(gpu_index >= 0)  return network_predict_gpu(net, input);
#endif
    net.input = input;
    net.truth = 0;
    net.train = 0;
    net.delta = 0;
    forward_network(net);
    return net.output;
}

float *network_predict_p(network *net, float *input)
{
    return network_predict(*net, input);
}

float *network_predict_image(network *net, image im)
{
    image imr = letterbox_image(im, net->w, net->h);
    set_batch_network(net, 1);
    float *p = network_predict(*net, imr.data);
    free_image(imr);
    return p;
}

int network_width(network *net){return net->w;}
int network_height(network *net){return net->h;}

matrix network_predict_data_multi(network net, data test, int n)
{
    int i,j,b,m;
    int k = net.outputs;
    matrix pred = make_matrix(test.X.rows, k);
    float *X = calloc(net.batch*test.X.rows, sizeof(float));
    for(i = 0; i < test.X.rows; i += net.batch){
        for(b = 0; b < net.batch; ++b){
            if(i+b == test.X.rows) break;
            memcpy(X+b*test.X.cols, test.X.vals[i+b], test.X.cols*sizeof(float));
        }
        for(m = 0; m < n; ++m){
            float *out = network_predict(net, X);
            for(b = 0; b < net.batch; ++b){
                if(i+b == test.X.rows) break;
                for(j = 0; j < k; ++j){
                    pred.vals[i+b][j] += out[j+b*k]/n;
                }
            }
        }
    }
    free(X);
    return pred;   
}

matrix network_predict_data(network net, data test)
{
    int i,j,b;
    int k = net.outputs;
    matrix pred = make_matrix(test.X.rows, k);
    float *X = calloc(net.batch*test.X.cols, sizeof(float));
    for(i = 0; i < test.X.rows; i += net.batch){
        for(b = 0; b < net.batch; ++b){
            if(i+b == test.X.rows) break;
            memcpy(X+b*test.X.cols, test.X.vals[i+b], test.X.cols*sizeof(float));
        }
        float *out = network_predict(net, X);
        for(b = 0; b < net.batch; ++b){
            if(i+b == test.X.rows) break;
            for(j = 0; j < k; ++j){
                pred.vals[i+b][j] = out[j+b*k];
            }
        }
    }
    free(X);
    return pred;   
}

void print_network(network net)
{
    int i,j;
    for(i = 0; i < net.n; ++i){
        layer l = net.layers[i];
        float *output = l.output;
        int n = l.outputs;
        float mean = mean_array(output, n);
        float vari = variance_array(output, n);
        fprintf(stderr, "Layer %d - Mean: %f, Variance: %f\n",i,mean, vari);
        if(n > 100) n = 100;
        for(j = 0; j < n; ++j) fprintf(stderr, "%f, ", output[j]);
        if(n == 100)fprintf(stderr,".....\n");
        fprintf(stderr, "\n");
    }
}

void compare_networks(network n1, network n2, data test)
{
    matrix g1 = network_predict_data(n1, test);
    matrix g2 = network_predict_data(n2, test);
    int i;
    int a,b,c,d;
    a = b = c = d = 0;
    for(i = 0; i < g1.rows; ++i){
        int truth = max_index(test.y.vals[i], test.y.cols);
        int p1 = max_index(g1.vals[i], g1.cols);
        int p2 = max_index(g2.vals[i], g2.cols);
        if(p1 == truth){
            if(p2 == truth) ++d;
            else ++c;
        }else{
            if(p2 == truth) ++b;
            else ++a;
        }
    }
    printf("%5d %5d\n%5d %5d\n", a, b, c, d);
    float num = pow((abs(b - c) - 1.), 2.);
    float den = b + c;
    printf("%f\n", num/den); 
}

float network_accuracy(network net, data d)
{
    matrix guess = network_predict_data(net, d);
    float acc = matrix_topk_accuracy(d.y, guess,1);
    free_matrix(guess);
    return acc;
}

float *network_accuracies(network net, data d, int n)
{
    static float acc[2];
    matrix guess = network_predict_data(net, d);
    acc[0] = matrix_topk_accuracy(d.y, guess, 1);
    acc[1] = matrix_topk_accuracy(d.y, guess, n);
    free_matrix(guess);
    return acc;
}

layer get_network_output_layer(network net)
{
    int i;
    for(i = net.n - 1; i >= 0; --i){
        if(net.layers[i].type != COST) break;
    }
    return net.layers[i];
}

float network_accuracy_multi(network net, data d, int n)
{
    matrix guess = network_predict_data_multi(net, d, n);
    float acc = matrix_topk_accuracy(d.y, guess,1);
    free_matrix(guess);
    return acc;
}

void free_network(network net)
{
    int i;
    for(i = 0; i < net.n; ++i){
        free_layer(net.layers[i]);
    }
    free(net.layers);
    if(net.input) free(net.input);
    if(net.truth) free(net.truth);
#ifdef GPU
    if(net.input_gpu) cuda_free(net.input_gpu);
    if(net.truth_gpu) cuda_free(net.truth_gpu);
#endif
}

// Some day...


layer network_output_layer(network net)
{
    int i;
    for(i = net.n - 1; i >= 0; --i){
        if(net.layers[i].type != COST) break;
    }
    return net.layers[i];
}

int network_inputs(network net)
{
    return net.layers[0].inputs;
}

int network_outputs(network net)
{
    return network_output_layer(net).outputs;
}

float *network_output(network net)
{
    return network_output_layer(net).output;
}