from os import environ, path
from time import time
from struct import pack
from typing import Any, Dict, List, Optional, Tuple
from hashlib import sha256

from .params import (
    ImageParams,
    Param,
    Size,
)


class ServerContext:
    def __init__(
        self,
        bundle_path: str = '.',
        model_path: str = '.',
        output_path: str = '.',
        params_path: str = '.',
        cors_origin: str = '*',
        num_workers: int = 1,
        block_platforms: List[str] = [],
    ) -> None:
        self.bundle_path = bundle_path
        self.model_path = model_path
        self.output_path = output_path
        self.params_path = params_path
        self.cors_origin = cors_origin
        self.num_workers = num_workers
        self.block_platforms = block_platforms

    @classmethod
    def from_environ(cls):
        return ServerContext(
            bundle_path=environ.get('ONNX_WEB_BUNDLE_PATH',
                                    path.join('..', 'gui', 'out')),
            model_path=environ.get('ONNX_WEB_MODEL_PATH',
                                   path.join('..', 'models')),
            output_path=environ.get(
                'ONNX_WEB_OUTPUT_PATH', path.join('..', 'outputs')),
            params_path=environ.get('ONNX_WEB_PARAMS_PATH', '.'),
            # others
            cors_origin=environ.get('ONNX_WEB_CORS_ORIGIN', '*').split(','),
            num_workers=int(environ.get('ONNX_WEB_NUM_WORKERS', 1)),
            block_platforms=environ.get(
                'ONNX_WEB_BLOCK_PLATFORMS', '').split(',')
        )


def is_debug() -> bool:
    return environ.get('DEBUG') is not None


def get_and_clamp_float(args: Any, key: str, default_value: float, max_value: float, min_value=0.0) -> float:
    return min(max(float(args.get(key, default_value)), min_value), max_value)


def get_and_clamp_int(args: Any, key: str, default_value: int, max_value: int, min_value=1) -> int:
    return min(max(int(args.get(key, default_value)), min_value), max_value)


def get_from_list(args: Any, key: str, values: List[Any]) -> Optional[Any]:
    selected = args.get(key, None)
    if selected in values:
        return selected

    print('invalid selection: %s' % (selected))
    if len(values) > 0:
        return values[0]

    return None


def get_from_map(args: Any, key: str, values: Dict[str, Any], default: Any) -> Any:
    selected = args.get(key, default)
    if selected in values:
        return values[selected]
    else:
        return values[default]


def get_not_empty(args: Any, key: str, default: Any) -> Any:
    val = args.get(key, default)

    if val is None or len(val) == 0:
        val = default

    return val


def hash_value(sha, param: Param):
    if param is None:
        return
    elif isinstance(param, float):
        sha.update(bytearray(pack('!f', param)))
    elif isinstance(param, int):
        sha.update(bytearray(pack('!I', param)))
    elif isinstance(param, str):
        sha.update(param.encode('utf-8'))
    else:
        print('cannot hash param: %s, %s' % (param, type(param)))


def make_output_name(
    mode: str,
    params: ImageParams,
    size: Size,
    extras: Optional[Tuple[Param]] = None
) -> str:
    now = int(time())
    sha = sha256()

    hash_value(sha, mode)
    hash_value(sha, params.model)
    hash_value(sha, params.provider)
    hash_value(sha, params.scheduler.__name__)
    hash_value(sha, params.prompt)
    hash_value(sha, params.negative_prompt)
    hash_value(sha, params.cfg)
    hash_value(sha, params.steps)
    hash_value(sha, params.seed)
    hash_value(sha, size.width)
    hash_value(sha, size.height)

    if extras is not None:
        for param in extras:
            hash_value(sha, param)

    return '%s_%s_%s_%s.png' % (mode, params.seed, sha.hexdigest(), now)


def base_join(base: str, tail: str) -> str:
    tail_path = path.relpath(path.normpath(path.join('/', tail)), '/')
    return path.join(base, tail_path)