# Copyright (c) 2024 PaddlePaddle Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.


import enum
import json
from pathlib import Path

import numpy as np
import pandas as pd
import yaml
from PIL import Image

from ....utils.deps import class_requires_deps, is_dep_available
from .tablepyxl import document_to_xl

if is_dep_available("opencv-contrib-python"):
    import cv2


__all__ = [
    "WriterType",
    "ImageWriter",
    "TextWriter",
    "JsonWriter",
    "CSVWriter",
    "HtmlWriter",
    "XlsxWriter",
    "YAMLWriter",
    "VideoWriter",
    "MarkdownWriter",
]


class WriterType(enum.Enum):
    """WriterType"""

    IMAGE = 1
    VIDEO = 2
    TEXT = 3
    JSON = 4
    HTML = 5
    XLSX = 6
    CSV = 7
    YAML = 8


class _BaseWriter(object):
    """_BaseWriter"""

    def __init__(self, backend, **bk_args):
        super().__init__()
        if len(bk_args) == 0:
            bk_args = self.get_default_backend_args()
        self.bk_type = backend
        self.bk_args = bk_args
        self._backend = self.get_backend()

    def write(self, out_path, obj):
        """write"""
        raise NotImplementedError

    def get_backend(self, bk_args=None):
        """get backend"""
        if bk_args is None:
            bk_args = self.bk_args
        return self._init_backend(self.bk_type, bk_args)

    def set_backend(self, backend, **bk_args):
        self.bk_type = backend
        self.bk_args = bk_args
        self._backend = self.get_backend()

    def _init_backend(self, bk_type, bk_args):
        """init backend"""
        raise NotImplementedError

    def get_type(self):
        """get type"""
        raise NotImplementedError

    def get_default_backend_args(self):
        """get default backend arguments"""
        return {}


class ImageWriter(_BaseWriter):
    """ImageWriter"""

    def __init__(self, backend="opencv", **bk_args):
        super().__init__(backend=backend, **bk_args)

    def write(self, out_path, obj):
        """write"""
        return self._backend.write_obj(str(out_path), obj)

    def _init_backend(self, bk_type, bk_args):
        """init backend"""
        if bk_type == "opencv":
            return OpenCVImageWriterBackend(**bk_args)
        elif bk_type == "pil" or bk_type == "pillow":
            return PILImageWriterBackend(**bk_args)
        else:
            raise ValueError("Unsupported backend type")

    def get_type(self):
        """get type"""
        return WriterType.IMAGE


class VideoWriter(_BaseWriter):
    """VideoWriter"""

    def __init__(self, backend="opencv", **bk_args):
        super().__init__(backend=backend, **bk_args)

    def write(self, out_path, obj):
        """write"""
        return self._backend.write_obj(str(out_path), obj)

    def _init_backend(self, bk_type, bk_args):
        """init backend"""
        if bk_type == "opencv":
            return OpenCVVideoWriterBackend(**bk_args)
        else:
            raise ValueError("Unsupported backend type")

    def get_type(self):
        """get type"""
        return WriterType.VIDEO


class TextWriter(_BaseWriter):
    """TextWriter"""

    def __init__(self, backend="python", **bk_args):
        super().__init__(backend=backend, **bk_args)

    def write(self, out_path, obj):
        """write"""
        return self._backend.write_obj(str(out_path), obj)

    def _init_backend(self, bk_type, bk_args):
        """init backend"""
        if bk_type == "python":
            return TextWriterBackend(**bk_args)
        else:
            raise ValueError("Unsupported backend type")

    def get_type(self):
        """get type"""
        return WriterType.TEXT


class JsonWriter(_BaseWriter):
    def __init__(self, backend="json", **bk_args):
        super().__init__(backend=backend, **bk_args)

    def write(self, out_path, obj, **bk_args):
        return self._backend.write_obj(str(out_path), obj, **bk_args)

    def _init_backend(self, bk_type, bk_args):
        if bk_type == "json":
            return JsonWriterBackend(**bk_args)
        elif bk_type == "ujson":
            return UJsonWriterBackend(**bk_args)
        else:
            raise ValueError("Unsupported backend type")

    def get_type(self):
        """get type"""
        return WriterType.JSON


class HtmlWriter(_BaseWriter):
    def __init__(self, backend="html", **bk_args):
        super().__init__(backend=backend, **bk_args)

    def write(self, out_path, obj, **bk_args):
        return self._backend.write_obj(str(out_path), obj, **bk_args)

    def _init_backend(self, bk_type, bk_args):
        if bk_type == "html":
            return HtmlWriterBackend(**bk_args)
        else:
            raise ValueError("Unsupported backend type")

    def get_type(self):
        """get type"""
        return WriterType.HTML


class XlsxWriter(_BaseWriter):
    def __init__(self, backend="xlsx", **bk_args):
        super().__init__(backend=backend, **bk_args)

    def write(self, out_path, obj, **bk_args):
        return self._backend.write_obj(str(out_path), obj, **bk_args)

    def _init_backend(self, bk_type, bk_args):
        if bk_type == "xlsx":
            return XlsxWriterBackend(**bk_args)
        else:
            raise ValueError("Unsupported backend type")

    def get_type(self):
        """get type"""
        return WriterType.XLSX


class YAMLWriter(_BaseWriter):
    def __init__(self, backend="PyYAML", **bk_args):
        super().__init__(backend=backend, **bk_args)

    def write(self, out_path, obj, **bk_args):
        return self._backend.write_obj(str(out_path), obj, **bk_args)

    def _init_backend(self, bk_type, bk_args):
        if bk_type == "PyYAML":
            return YAMLWriterBackend(**bk_args)
        else:
            raise ValueError("Unsupported backend type")

    def get_type(self):
        """get type"""
        return WriterType.YAML


class MarkdownWriter(_BaseWriter):
    """MarkdownWriter"""

    def __init__(self, backend="markdown", **bk_args):
        super().__init__(backend=backend, **bk_args)

    def write(self, out_path, obj):
        """write"""
        return self._backend.write_obj(str(out_path), obj)

    def _init_backend(self, bk_type, bk_args):
        """init backend"""
        if bk_type == "markdown":
            return MarkdownWriterBackend(**bk_args)
        else:
            raise ValueError("Unsupported backend type")

    def get_type(self):
        """get type"""
        return WriterType.MARKDOWN


class _BaseWriterBackend(object):
    """_BaseWriterBackend"""

    def write_obj(self, out_path, obj, **bk_args):
        """write object"""
        Path(out_path).parent.mkdir(parents=True, exist_ok=True)
        return self._write_obj(out_path, obj, **bk_args)

    def _write_obj(self, out_path, obj, **bk_args):
        """write object"""
        raise NotImplementedError


class TextWriterBackend(_BaseWriterBackend):
    """TextWriterBackend"""

    def __init__(self, mode="w", encoding="utf-8"):
        super().__init__()
        self.mode = mode
        self.encoding = encoding

    def _write_obj(self, out_path, obj):
        """write text object"""
        with open(out_path, mode=self.mode, encoding=self.encoding) as f:
            f.write(obj)


class HtmlWriterBackend(_BaseWriterBackend):

    def __init__(self, mode="w", encoding="utf-8"):
        super().__init__()
        self.mode = mode
        self.encoding = encoding

    def _write_obj(self, out_path, obj, **bk_args):
        with open(out_path, mode=self.mode, encoding=self.encoding) as f:
            f.write(obj)


class XlsxWriterBackend(_BaseWriterBackend):
    def _write_obj(self, out_path, obj, **bk_args):
        document_to_xl(obj, out_path)


class _ImageWriterBackend(_BaseWriterBackend):
    """_ImageWriterBackend"""


@class_requires_deps("opencv-contrib-python")
class OpenCVImageWriterBackend(_ImageWriterBackend):
    """OpenCVImageWriterBackend"""

    def _write_obj(self, out_path, obj):
        """write image object by OpenCV"""
        if isinstance(obj, Image.Image):
            # Assuming the channel order is RGB.
            arr = np.asarray(obj)[:, :, ::-1]
        elif isinstance(obj, np.ndarray):
            arr = obj
        else:
            raise TypeError("Unsupported object type")
        return cv2.imwrite(out_path, arr)


class PILImageWriterBackend(_ImageWriterBackend):
    """PILImageWriterBackend"""

    def __init__(self, format_=None):
        super().__init__()
        self.format = format_

    def _write_obj(self, out_path, obj):
        """write image object by PIL"""
        if isinstance(obj, Image.Image):
            img = obj
        elif isinstance(obj, np.ndarray):
            img = Image.fromarray(obj)
        else:
            raise TypeError("Unsupported object type")
        if len(img.getbands()) == 4:
            self.format = "PNG"
        return img.save(out_path, format=self.format)


class _VideoWriterBackend(_BaseWriterBackend):
    """_VideoWriterBackend"""


@class_requires_deps("opencv-contrib-python")
class OpenCVVideoWriterBackend(_VideoWriterBackend):
    """OpenCVImageWriterBackend"""

    def _write_obj(self, out_path, obj):
        """write video object by OpenCV"""
        obj, fps = obj
        if isinstance(obj, np.ndarray):
            vr = obj
            width, height = vr[0].shape[1], vr[0].shape[0]
            fourcc = cv2.VideoWriter_fourcc(*"mp4v")  # Alternatively, use 'XVID'
            out = cv2.VideoWriter(out_path, fourcc, fps, (width, height))
            for frame in vr:
                out.write(frame)
            out.release()
        else:
            raise TypeError("Unsupported object type")


class _BaseJsonWriterBackend(object):
    def __init__(self, indent=4, ensure_ascii=False):
        super().__init__()
        self.indent = indent
        self.ensure_ascii = ensure_ascii

    def write_obj(self, out_path, obj, **bk_args):
        Path(out_path).parent.mkdir(parents=True, exist_ok=True)
        return self._write_obj(out_path, obj, **bk_args)

    def _write_obj(self, out_path, obj):
        raise NotImplementedError


class JsonWriterBackend(_BaseJsonWriterBackend):
    def _write_obj(self, out_path, obj, **bk_args):
        with open(out_path, "w", encoding="utf-8") as f:
            json.dump(obj, f, **bk_args)


class UJsonWriterBackend(_BaseJsonWriterBackend):
    # TODO
    def _write_obj(self, out_path, obj, **bk_args):
        raise NotImplementedError


class YAMLWriterBackend(_BaseWriterBackend):

    def __init__(self, mode="w", encoding="utf-8"):
        super().__init__()
        self.mode = mode
        self.encoding = encoding

    def _write_obj(self, out_path, obj, **bk_args):
        """write text object"""
        with open(out_path, mode=self.mode, encoding=self.encoding) as f:
            yaml.dump(obj, f, **bk_args)


class CSVWriter(_BaseWriter):
    """CSVWriter"""

    def __init__(self, backend="pandas", **bk_args):
        super().__init__(backend=backend, **bk_args)

    def write(self, out_path, obj):
        """write"""
        return self._backend.write_obj(str(out_path), obj)

    def _init_backend(self, bk_type, bk_args):
        """init backend"""
        if bk_type == "pandas":
            return PandasCSVWriterBackend(**bk_args)
        else:
            raise ValueError("Unsupported backend type")

    def get_type(self):
        """get type"""
        return WriterType.CSV


class _CSVWriterBackend(_BaseWriterBackend):
    """_CSVWriterBackend"""


class PandasCSVWriterBackend(_CSVWriterBackend):
    """PILImageWriterBackend"""

    def __init__(self):
        super().__init__()

    def _write_obj(self, out_path, obj):
        """write image object by PIL"""
        if isinstance(obj, pd.DataFrame):
            ts = obj
        else:
            raise TypeError("Unsupported object type")
        return ts.to_csv(out_path)


class MarkdownWriterBackend(_BaseWriterBackend):
    """MarkdownWriterBackend"""

    def __init__(self):
        super().__init__()

    def _write_obj(self, out_path, obj):
        """write markdown obj"""
        with open(out_path, mode="w", encoding="utf-8", errors="replace") as f:
            f.write(obj)
