import torch
import torch.nn as nn
import torch.nn.functional as F
import numpy as np
import cv2

from nets import Model

import wandb

from torch.utils.data import DataLoader
from dataset import CTDDataset
from train import normalize_and_colormap, parse_yaml, inference as ctd_inference

device = 'cuda'
wandb.init(project="crestereo", entity="cpt-captain")


def do_infer(left_img, right_img, gt_disp, model):
    disp = ctd_inference(left_img, right_img, gt_disp, None, model, None, n_iter=20, wandb_log=False)

    disp_vis = normalize_and_colormap(disp)
    gt_disp_vis = normalize_and_colormap(gt_disp)
    if gt_disp.shape != disp.shape:
        gt_disp = gt_disp.reshape(disp.shape)
    disp_err = gt_disp - disp
    disp_err = normalize_and_colormap(disp_err.abs())

    wandb.log({
        'disp': wandb.Image(
            disp,
            caption=f"Pred. Disparity \n{disp.min():.{2}f}/{disp.max():.{2}f}",
        ),
        'disp_vis': wandb.Image(
            disp_vis,
            caption=f"Pred. Disparity \n{disp.min():.{2}f}/{disp.max():.{2}f}",
        ),
        'gt_disp_vis': wandb.Image(
            gt_disp_vis,
            caption=f"GT Disparity \n{gt_disp.min():.{2}f}/{gt_disp.max():.{2}f}",
        ),
        'disp_err': wandb.Image(
            disp_err,
            caption=f"Disparity Error\n{disp_err.min():.{2}f}/{disp_err.max():.{2}f}",
        ),
        'input_left': wandb.Image(
            left_img.cpu().detach().numpy().astype('uint8'),
            caption=f"Input left",
        ),
        'input_right': wandb.Image(
            right_img.cpu().detach().numpy().astype('uint8'),
            caption=f"Input right",
        ),
    })


if __name__ == '__main__':
    # model_path = "models/crestereo_eth3d.pth"
    model_path = "train_log/models/latest.pth"

    # reference_pattern_path = '/home/nils/kinect_reference_high_res_scaled_down.png'
    reference_pattern_path = '/home/nils/kinect_reference_cropped.png'
    # reference_pattern_path = '/home/nils/new_reference.png'
    # reference_pattern_path = '/home/nils/kinect_reference_high_res.png'
    # reference_pattern_path = '/home/nils/orig_ctd/connecting_the_dots/data/kinect_pattern.png'

    data_type = 'kinect'
    augment = False

    args = parse_yaml("cfgs/train.yaml")

    wandb.config.update({'model_path': model_path, 'reference_pattern': reference_pattern_path, 'augment': augment})

    model = Model(max_disp=256, mixed_precision=False, test_mode=True)
    model = nn.DataParallel(model, device_ids=[device])
    state_dict = torch.load(model_path)['state_dict']
    model.load_state_dict(state_dict, strict=True)
    model.to(device)
    model.eval()

    dataset = CTDDataset('/media/Data1/connecting_the_dots_data/ctd_data/', data_type=data_type,
                         pattern_path=reference_pattern_path, augment=augment)
    dataloader = DataLoader(dataset, args.batch_size, shuffle=True,
                            num_workers=0, drop_last=False, persistent_workers=False, pin_memory=True)
    for batch in dataloader:
        for left, right, disparity in zip(batch['left'], batch['right'], batch['disparity']):
            right = right.transpose(0, 2).transpose(0, 1)
            left_img = left
            imgL = left.cpu().detach().numpy()
            right_img = right
            imgR = right.cpu().detach().numpy()
            gt_disp = disparity
            do_infer(left_img, right_img, gt_disp, model)