import os
from datetime import datetime
import mimetypes
from typing import Text
from dataclasses import dataclass
import hashlib
import subprocess

import mutagen

LIBRARY_PATH = "/home/fmartingr/Code/memories/testphotos"
RAW_MIMETYPES = {
    # RAW pictures
    "ARW": "image/x-sony-arw",
    "CR2": "image/x-canon-cr2",
    "CR3": "image/x-canon-cr3",
    "CRW": "image/x-canon-crw",
    "DCR": "image/x-kodak-dcr",
    "DNG": "image/x-adobe-dng",
    "ERF": "image/x-epson-erf",
    "K25": "image/x-kodak-k25",
    "KDC": "image/x-kodak-kdc",
    "MRW": "image/x-minolta-mrw",
    "NEF": "image/x-nikon-nef",
    "ORF": "image/x-olympus-orf",
    "PEF": "image/x-pentax-pef",
    "RAF": "image/x-fuji-raf",
    "RAW": "image/x-panasonic-raw",
    "SR2": "image/x-sony-sr2",
    "SRF": "image/x-sony-srf",
    "X3F": "image/x-sigma-x3f",
}
# High Efficiency Image/Video (apple)
APPLE_MIMETYPES = {"HEIC": "image/heic", "HEIF": "image/heif", "HEVC": "video/hevc"}

CUSTOM_MIMETYPES = {}
CUSTOM_MIMETYPES.update(RAW_MIMETYPES)
CUSTOM_MIMETYPES.update(APPLE_MIMETYPES)

for extension, mimetype in CUSTOM_MIMETYPES.items():
    mimetypes.add_type(mimetype, f".{extension}")
    mimetypes.add_type(mimetype, f".{extension.lower()}")


def read_exif(path):
    output = {}
    with subprocess.Popen(["exiftool", path], stdout=subprocess.PIPE) as proc:
        for line in proc.stdout.readlines():
            key, value = line.decode("utf-8").strip().split(":", maxsplit=1)
            output[key.strip()] = value.strip()
    return output


@dataclass
class File:
    __mro__ = {"path", "_type"}

    path: str

    @property
    def mimetype(self) -> Text:
        """Retrieves the file mimetype by extension"""
        if not getattr(self, "_mimetype", False):
            self._mimetype, _ = mimetypes.guess_type(self.path)
            if not self._mimetype:
                print(f"Can't guess type of file {self.path}")
        return self._mimetype

    @property
    def is_raw(self) -> bool:
        return self.mimetype in RAW_MIMETYPES.values()

    @property
    def is_image(self) -> bool:
        return "image" in self.mimetype

    @property
    def is_video(self) -> bool:
        return "video" in self.mimetype

    @property
    def stat(self):
        stat = os.stat(self.path)
        return {k: getattr(stat, k) for k in dir(stat) if k.startswith("st_")}

    @property
    def exif(self) -> dict:
        """
        Retrieve EXIF data from the file and merge it with wathever mutagen finds in there for video files.
        """
        if not getattr(self, "_exif", False):
            self._exif = read_exif(self.path)
            if self.is_video:
                self._exif.update(mutagen.File(self.path))
        return self._exif

    def get_datetime(self) -> datetime:
        """
        Tries to guess the original datetime for the provided file.
        This is done extracting several EXIF values and the file birthdate/modification date.
        The oldest one is the winner.
        """

        CREATION_DATE_EXIF_KEYS = (
            "Content Create Date",
            "Date/Time Original",
            "Create Date",
            "Date Created",
            "File Modification Date/Time",
        )

        datetimes = []

        for key in CREATION_DATE_EXIF_KEYS:
            try:
                dt = datetime.strptime(self.exif[key], "%Y:%m:%d %H:%M:%S%z")
                datetimes.append(dt.replace(tzinfo=None))
            except KeyError:
                pass
            except ValueError:
                try:
                    cleaned = self.exif[key].rsplit(".", maxsplit=1)
                    datetimes.append(datetime.strptime(cleaned[0], "%Y:%m:%d %H:%M:%S"))
                except ValueError:
                    pass

        # Last resort, use file creation/modification date
        stat = os.stat(self.path)
        try:
            datetimes.append(datetime.fromtimestamp(stat.st_birthtime))
        except AttributeError:
            # Linux: No easy way to get creation dates here,
            # so we'll settle for when its content was last modified.
            datetimes.append(datetime.fromtimestamp(stat.st_mtime))

        sorted_datetimes = sorted(datetimes)
        return sorted_datetimes[0]

    @property
    def datetime(self):
        if not getattr(self, "_datetime", False):
            self._datetime = self.get_datetime()
        return self._datetime

    @property
    def filename(self):
        return os.path.splitext(os.path.basename(self.path))[0]

    @property
    def extension(self):
        return os.path.splitext(self.path)[1][1:].lower()

    @property
    def checksum(self) -> Text:
        if not getattr(self, "_checksum", False):
            digest = hashlib.sha224()
            with open(self.path, "rb") as handler:
                digest.update(handler.read())

            self._checksum = f"sha224-{digest.hexdigest()}"
        return self._checksum

    def as_dict(self):
        return {
            "path": self.path,
            "filename": self.filename,
            "extension": self.extension,
            "checksum": self.checksum,
            "datetime": self.datetime,
            "exif": self.exif,
        }


def get_files():
    for root, dirs, files in os.walk(LIBRARY_PATH):
        for filename in files:
            yield File(path=os.path.join(root, filename))