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

from __future__ import annotations

from itertools import chain

import aqt.main
from anki.collection import Collection, ImportLogWithChanges, Progress
from anki.errors import Interrupted
from anki.foreign_data import mnemosyne
from aqt.operations import CollectionOp, QueryOp
from aqt.progress import ProgressUpdate
from aqt.qt import *
from aqt.utils import askUser, getFile, showInfo, showText, showWarning, tooltip, tr


def import_file(mw: aqt.main.AnkiQt, path: str) -> None:
    filename = os.path.basename(path).lower()
    if filename.endswith(".anki"):
        showInfo(tr.importing_anki_files_are_from_a_very())
    elif filename.endswith(".anki2"):
        showInfo(tr.importing_anki2_files_are_not_directly_importable())
    elif is_collection_package(filename):
        maybe_import_collection_package(mw, path)
    elif filename.endswith(".apkg") or filename.endswith(".zip"):
        import_anki_package(mw, path)
    elif filename.endswith(".db"):
        import_mnemosyne(mw, path)
    else:
        import aqt.import_export.import_dialog

        aqt.import_export.import_dialog.ImportDialog(mw, path)


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:
    if file := getFile(
        mw, tr.actions_import(), None, key="import", filter=file_filter()
    ):
        return str(file)
    return None


def file_filter() -> str:
    return ";;".join(
        (
            tr.importing_packaged_anki_deckcollection_apkg_colpkg_zip(),
            tr.importing_text_separated_by_tabs_or_semicolons(),
            tr.importing_mnemosyne_20_deck_db(),
        )
    )


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


def maybe_import_collection_package(mw: aqt.main.AnkiQt, path: str) -> None:
    if askUser(
        tr.importing_this_will_delete_your_existing_collection(),
        msgfunc=QMessageBox.warning,
        defaultno=True,
    ):
        import_collection_package(mw, path)


def import_collection_package(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()


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_anki_package(mw: aqt.main.AnkiQt, path: str) -> None:
    CollectionOp(
        parent=mw,
        op=lambda col: col.import_anki_package(path),
    ).with_backend_progress(import_progress_update).success(
        show_import_log
    ).run_in_background()


def import_mnemosyne(mw: aqt.main.AnkiQt, path: str) -> None:
    QueryOp(
        parent=mw,
        op=lambda _: mnemosyne.serialize(path),
        success=lambda json: import_json(mw, json),
    ).with_progress().run_in_background()


def import_json(mw: aqt.main.AnkiQt, json: str) -> None:
    CollectionOp(parent=mw, op=lambda col: col.import_json(json)).with_backend_progress(
        import_progress_update
    ).success(show_import_log).run_in_background()


def show_import_log(log_with_changes: ImportLogWithChanges) -> None:
    showText(stringify_log(log_with_changes.log), plain_text_edit=True)


def stringify_log(log: ImportLogWithChanges.Log) -> str:
    total = len(log.conflicting) + len(log.updated) + len(log.new) + len(log.duplicate)
    return "\n".join(
        chain(
            (tr.importing_notes_found_in_file(val=total),),
            (
                template_string(val=len(row))
                for (row, template_string) in (
                    (log.conflicting, tr.importing_notes_that_could_not_be_imported),
                    (log.updated, tr.importing_notes_updated_as_file_had_newer),
                    (log.new, tr.importing_notes_added_from_file),
                    (log.duplicate, tr.importing_notes_skipped_as_theyre_already_in),
                )
                if row
            ),
            ("",),
            *(
                [f"[{action}] {', '.join(note.fields)}" for note in rows]
                for (rows, action) in (
                    (log.conflicting, tr.importing_skipped()),
                    (log.updated, tr.importing_updated()),
                    (log.new, tr.adding_added()),
                    (log.duplicate, tr.importing_identical()),
                )
            ),
        )
    )


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