''' infer.py for runpod worker '''

import os
import predict

import runpod
from runpod.serverless.utils import rp_download, rp_upload, rp_cleanup
from runpod.serverless.utils.rp_validator import validate


INPUT_SCHEMA = {
    'prompt': {
        'type': str,
        'required': True
    },
    'negative_prompt': {
        'type': str,
        'required': False,
        'default': None
    },
    'width': {
        'type': int,
        'required': False,
        'default': 512,
        'constraints': lambda width: width in [128, 256, 384, 448, 512, 576, 640, 704, 768]
    },
    'height': {
        'type': int,
        'required': False,
        'default': 512,
        'constraints': lambda height: height in [128, 256, 384, 448, 512, 576, 640, 704, 768]
    },
    'init_image': {
        'type': str,
        'required': False,
        'default': None
    },
    'mask': {
        'type': str,
        'required': False,
        'default': None
    },
    'prompt_strength': {
        'type': float,
        'required': False,
        'default': 0.8,
        'constraints': lambda prompt_strength: 0 <= prompt_strength <= 1
    },
    'num_outputs': {
        'type': int,
        'required': False,
        'default': 1,
        'constraints': lambda num_outputs: 10 > num_outputs > 0
    },
    'num_inference_steps': {
        'type': int,
        'required': False,
        'default': 50,
        'constraints': lambda num_inference_steps: 0 < num_inference_steps < 500
    },
    'guidance_scale': {
        'type': float,
        'required': False,
        'default': 7.5,
        'constraints': lambda guidance_scale: 0 < guidance_scale < 20
    },
    'scheduler': {
        'type': str,
        'required': False,
        'default': 'K-LMS',
        'constraints': lambda scheduler: scheduler in ['DDIM', 'DDPM', 'DPM-M', 'DPM-S',  'EULER-A', 'EULER-D', 'HEUN', 'IPNDM', 'KDPM2-A', 'KDPM2-D', 'PNDM', 'K-LMS']
    },
    'seed': {
        'type': int,
        'required': False,
        'default': None
    },
    'nsfw': {
        'type': bool,
        'required': False,
        'default': False
    }
}


def run(job):
    '''
    Run inference on the model.
    Returns output path, width the seed used to generate the image.
    '''
    job_input = job['input']

    # Input validation
    validated_input = validate(job_input, INPUT_SCHEMA)

    if 'errors' in validated_input:
        return {"error": validated_input['errors']}
    validated_input = validated_input['validated_input']

    # Download input objects
    job_input['init_image'], job_input['mask'] = rp_download.download_input_objects(
        [job_input.get('init_image', None), job_input.get('mask', None)]
    )  # pylint: disable=unbalanced-tuple-unpacking

    MODEL.NSFW = job_input.get('nsfw', True)

    if job_input['seed'] is None:
        job_input['seed'] = int.from_bytes(os.urandom(2), "big")

    img_paths = MODEL.predict(
        prompt=job_input["prompt"],
        negative_prompt=job_input.get("negative_prompt", None),
        width=job_input.get('width', 512),
        height=job_input.get('height', 512),
        init_image=job_input['init_image'],
        mask=job_input['mask'],
        prompt_strength=job_input['prompt_strength'],
        num_outputs=job_input.get('num_outputs', 1),
        num_inference_steps=job_input.get('num_inference_steps', 50),
        guidance_scale=job_input['guidance_scale'],
        scheduler=job_input.get('scheduler', "K-LMS"),
        seed=job_input['seed']
    )

    job_output = []
    for index, img_path in enumerate(img_paths):
        image_url = rp_upload.upload_image(job['id'], img_path, index)

        job_output.append({
            "image": image_url,
            "seed": job_input['seed'] + index
        })

    # Remove downloaded input objects
    rp_cleanup.clean(['input_objects'])

    return job_output


parser = argparse.ArgumentParser(description=__doc__)
parser.add_argument("--model_url", type=str,
                    default=None, help="Model URL")

if __name__ == "__main__":
    args = parser.parse_args()
    print(args)

    if "huggingface.co" in args.model_url:
        url_parts = args.model_url.split("/")
        model_id = f"{url_parts[-2]}/{url_parts[-1]}"
    else:
        model_id = f"./{MODEL_CACHE_DIR}/model"

    MODEL = predict.Predictor(model_id)
    MODEL.setup()

    runpod.serverless.start({"handler": run})