# Copyright: Ankitects Pty Ltd and contributors
# License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html

from __future__ import annotations

import os
import re
from abc import ABC, abstractmethod
from collections.abc import Callable
from itertools import chain

import aqt.main
from anki.collection import Collection, Progress
from anki.errors import Interrupted
from anki.foreign_data import mnemosyne
from anki.lang import without_unicode_isolation
from anki.utils import tmpdir
from aqt.import_export.import_dialog import (
    AnkiPackageArgs,
    CsvArgs,
    ImportDialog,
    JsonFileArgs,
)
from aqt.operations import QueryOp
from aqt.progress import ProgressUpdate
from aqt.qt import *
from aqt.utils import askUser, getFile, showWarning, tooltip, tr


class Importer(ABC):
    accepted_file_endings: list[str]

    @classmethod
    def can_import(cls, lowercase_filename: str) -> bool:
        return any(
            lowercase_filename.endswith(ending) for ending in cls.accepted_file_endings
        )

    @classmethod
    @abstractmethod
    def do_import(cls, mw: aqt.main.AnkiQt, path: str) -> None: ...


class ColpkgImporter(Importer):
    accepted_file_endings = [".apkg", ".colpkg"]

    @staticmethod
    def can_import(filename: str) -> bool:
        return (
            filename == "collection.apkg"
            or (filename.startswith("backup-") and filename.endswith(".apkg"))
            or filename.endswith(".colpkg")
        )

    @staticmethod
    def do_import(mw: aqt.main.AnkiQt, path: str) -> None:
        if askUser(
            tr.importing_this_will_delete_your_existing_collection(),
            msgfunc=QMessageBox.warning,
            defaultno=True,
        ):
            ColpkgImporter._import(mw, path)

    @staticmethod
    def _import(mw: aqt.main.AnkiQt, file: str) -> None:
        def on_success() -> None:
            mw.loadCollection()
            tooltip(tr.importing_importing_complete())

        def on_failure(err: Exception) -> None:
            mw.loadCollection()
            if not isinstance(err, Interrupted):
                showWarning(str(err))

        QueryOp(
            parent=mw,
            op=lambda _: mw.create_backup_now(),
            success=lambda _: mw.unloadCollection(
                lambda: import_collection_package_op(mw, file, on_success)
                .failure(on_failure)
                .run_in_background()
            ),
        ).with_progress().run_in_background()


class ApkgImporter(Importer):
    accepted_file_endings = [".apkg", ".zip"]

    @staticmethod
    def do_import(mw: aqt.main.AnkiQt, path: str) -> None:
        ImportDialog(mw, AnkiPackageArgs(path))


class MnemosyneImporter(Importer):
    accepted_file_endings = [".db"]

    @staticmethod
    def do_import(mw: aqt.main.AnkiQt, path: str) -> None:
        def on_success(json: str) -> None:
            json_path = os.path.join(tmpdir(), os.path.basename(path))
            with open(json_path, "wb") as file:
                file.write(json.encode("utf8"))
            ImportDialog(mw, JsonFileArgs(path=json_path))

        QueryOp(
            parent=mw,
            op=lambda col: mnemosyne.serialize(path, col.decks.current()["id"]),
            success=on_success,
        ).with_progress().run_in_background()


class CsvImporter(Importer):
    accepted_file_endings = [".csv", ".tsv", ".txt"]

    @staticmethod
    def do_import(mw: aqt.main.AnkiQt, path: str) -> None:
        ImportDialog(mw, CsvArgs(path))


class JsonImporter(Importer):
    accepted_file_endings = [".anki-json"]

    @staticmethod
    def do_import(mw: aqt.main.AnkiQt, path: str) -> None:
        ImportDialog(mw, JsonFileArgs(path=path))


IMPORTERS: list[type[Importer]] = [
    ColpkgImporter,
    ApkgImporter,
    MnemosyneImporter,
    CsvImporter,
]


def legacy_file_endings(col: Collection) -> list[str]:
    from anki.importing import AnkiPackageImporter, TextImporter, importers
    from anki.importing import MnemosyneImporter as LegacyMnemosyneImporter

    return [
        ext
        for (text, importer) in importers(col)
        if importer not in (TextImporter, AnkiPackageImporter, LegacyMnemosyneImporter)
        for ext in re.findall(r"[( ]?\*(\..+?)[) ]", text)
    ]


def import_file(mw: aqt.main.AnkiQt, path: str) -> None:
    filename = os.path.basename(path).lower()

    if any(filename.endswith(ext) for ext in legacy_file_endings(mw.col)):
        import aqt.importing

        aqt.importing.importFile(mw, path)
        return

    for importer in IMPORTERS:
        if importer.can_import(filename):
            importer.do_import(mw, path)
            return

    showWarning("Unsupported file type.")


def prompt_for_file_then_import(mw: aqt.main.AnkiQt) -> None:
    if path := get_file_path(mw):
        import_file(mw, path)


def get_file_path(mw: aqt.main.AnkiQt) -> str | None:
    filter = without_unicode_isolation(
        tr.importing_all_supported_formats(
            val="({})".format(
                " ".join(f"*{ending}" for ending in all_accepted_file_endings(mw))
            )
        )
    )
    if file := getFile(mw, tr.actions_import(), None, key="import", filter=filter):
        return str(file)
    return None


def all_accepted_file_endings(mw: aqt.main.AnkiQt) -> set[str]:
    return set(
        chain(
            *(importer.accepted_file_endings for importer in IMPORTERS),
            legacy_file_endings(mw.col),
        )
    )


def import_collection_package_op(
    mw: aqt.main.AnkiQt, path: str, success: Callable[[], None]
) -> QueryOp[None]:
    def op(_: Collection) -> None:
        col_path = mw.pm.collectionPath()
        media_folder = os.path.join(mw.pm.profileFolder(), "collection.media")
        media_db = os.path.join(mw.pm.profileFolder(), "collection.media.db2")
        mw.backend.import_collection_package(
            col_path=col_path,
            backup_path=path,
            media_folder=media_folder,
            media_db=media_db,
        )

    return QueryOp(parent=mw, op=op, success=lambda _: success()).with_backend_progress(
        import_progress_update
    )


def import_progress_update(progress: Progress, update: ProgressUpdate) -> None:
    if not progress.HasField("importing"):
        return
    update.label = progress.importing
    if update.user_wants_abort:
        update.abort = True