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

import re
import time
from typing import cast

from anki.db import DB
from anki.importing.noteimp import ForeignCard, ForeignNote, NoteImporter
from anki.lang import ngettext
from anki.rsbackend import TR
from anki.stdmodels import addBasicModel, addClozeModel


class MnemosyneImporter(NoteImporter):

    needMapper = False
    update = False
    allowHTML = True

    def run(self):
        db = DB(self.file)
        ver = db.scalar("select value from global_variables where key='version'")
        if not ver.startswith("Mnemosyne SQL 1") and ver not in ("2", "3"):
            self.log.append(
                self.col.tr(TR.IMPORTING_FILE_VERSION_UNKNOWN_TRYING_IMPORT_ANYWAY)
            )
        # gather facts into temp objects
        curid = None
        notes = {}
        note = None
        for _id, id, k, v in db.execute(
            """
select _id, id, key, value from facts f, data_for_fact d where
f._id=d._fact_id"""
        ):
            if id != curid:
                if note:
                    # pylint: disable=unsubscriptable-object
                    notes[note["_id"]] = note
                note = {"_id": _id}
                curid = id
            assert note
            note[k] = v
        if note:
            notes[note["_id"]] = note
        # gather cards
        front = []
        frontback = []
        vocabulary = []
        cloze = {}
        for row in db.execute(
            """
select _fact_id, fact_view_id, tags, next_rep, last_rep, easiness,
acq_reps+ret_reps, lapses, card_type_id from cards"""
        ):
            # categorize note
            note = notes[row[0]]
            if row[1].endswith(".1"):
                if row[1].startswith("1.") or row[1].startswith("1::"):
                    front.append(note)
                elif row[1].startswith("2.") or row[1].startswith("2::"):
                    frontback.append(note)
                elif row[1].startswith("3.") or row[1].startswith("3::"):
                    vocabulary.append(note)
                elif row[1].startswith("5.1"):
                    cloze[row[0]] = note
            # check for None to fix issue where import can error out
            rawTags = row[2]
            if rawTags is None:
                rawTags = ""
            # merge tags into note
            tags = rawTags.replace(", ", "\x1f").replace(" ", "_")
            tags = tags.replace("\x1f", " ")
            if "tags" not in note:
                note["tags"] = []
            note["tags"] += self.col.tags.split(tags)
            # if it's a new card we can go with the defaults
            if row[3] == -1:
                continue
            # add the card
            c = ForeignCard()
            c.factor = int(row[5] * 1000)
            c.reps = row[6]
            c.lapses = row[7]
            # ivl is inferred in mnemosyne
            next, prev = row[3:5]
            c.ivl = max(1, (next - prev) // 86400)
            # work out how long we've got left
            rem = int((next - time.time()) / 86400)
            c.due = self.col.sched.today + rem
            # get ord
            m = re.search(r".(\d+)$", row[1])
            assert m
            ord = int(m.group(1)) - 1
            if "cards" not in note:
                note["cards"] = {}
            note["cards"][ord] = c
        self._addFronts(front)
        total = self.total
        self._addFrontBacks(frontback)
        total += self.total
        self._addVocabulary(vocabulary)
        self.total += total
        self._addCloze(cloze)
        self.total += total
        self.log.append(
            ngettext("%d note imported.", "%d notes imported.", self.total) % self.total
        )

    def fields(self):
        return self._fields

    def _mungeField(self, fld):
        # \n -> br
        fld = re.sub("\r?\n", "<br>", fld)
        # latex differences
        fld = re.sub(r"(?i)<(/?(\$|\$\$|latex))>", "[\\1]", fld)
        # audio differences
        fld = re.sub('<audio src="(.+?)">(</audio>)?', "[sound:\\1]", fld)
        return fld

    def _addFronts(self, notes, model=None, fields=("f", "b")):
        data = []
        for orig in notes:
            # create a foreign note object
            n = ForeignNote()
            n.fields = []
            for f in fields:
                fld = self._mungeField(orig.get(f, ""))
                n.fields.append(fld)
            n.tags = orig["tags"]
            n.cards = orig.get("cards", {})
            data.append(n)
        # add a basic model
        if not model:
            model = addBasicModel(self.col)
            model["name"] = "Mnemosyne-FrontOnly"
        mm = self.col.models
        mm.save(model)
        mm.setCurrent(model)
        self.model = model
        self._fields = len(model["flds"])
        self.initMapping()
        # import
        self.importNotes(data)

    def _addFrontBacks(self, notes):
        m = addBasicModel(self.col)
        m["name"] = "Mnemosyne-FrontBack"
        mm = self.col.models
        t = mm.newTemplate("Back")
        t["qfmt"] = "{{Back}}"
        t["afmt"] = t["qfmt"] + "\n\n<hr id=answer>\n\n{{Front}}"  # type: ignore
        mm.addTemplate(m, t)
        self._addFronts(notes, m)

    def _addVocabulary(self, notes):
        mm = self.col.models
        m = mm.new("Mnemosyne-Vocabulary")
        for f in "Expression", "Pronunciation", "Meaning", "Notes":
            fm = mm.newField(f)
            mm.addField(m, fm)
        t = mm.newTemplate("Recognition")
        t["qfmt"] = "{{Expression}}"
        t["afmt"] = (
            cast(str, t["qfmt"])
            + """\n\n<hr id=answer>\n\n\
{{Pronunciation}}<br>\n{{Meaning}}<br>\n{{Notes}}"""
        )
        mm.addTemplate(m, t)
        t = mm.newTemplate("Production")
        t["qfmt"] = "{{Meaning}}"
        t["afmt"] = (
            cast(str, t["qfmt"])
            + """\n\n<hr id=answer>\n\n\
{{Expression}}<br>\n{{Pronunciation}}<br>\n{{Notes}}"""
        )
        mm.addTemplate(m, t)
        mm.add(m)
        self._addFronts(notes, m, fields=("f", "p_1", "m_1", "n"))

    def _addCloze(self, notes):
        data = []
        notes = list(notes.values())
        for orig in notes:
            # create a foreign note object
            n = ForeignNote()
            n.fields = []
            fld = orig.get("text", "")
            fld = re.sub("\r?\n", "<br>", fld)
            state = dict(n=1)

            def repl(match):
                # pylint: disable=cell-var-from-loop
                # replace [...] with cloze refs
                res = "{{c%d::%s}}" % (state["n"], match.group(1))
                state["n"] += 1
                return res

            fld = re.sub(r"\[(.+?)\]", repl, fld)
            fld = self._mungeField(fld)
            n.fields.append(fld)
            n.fields.append("")  # extra
            n.tags = orig["tags"]
            n.cards = orig.get("cards", {})
            data.append(n)
        # add cloze model
        model = addClozeModel(self.col)
        model["name"] = "Mnemosyne-Cloze"
        mm = self.col.models
        mm.save(model)
        mm.setCurrent(model)
        self.model = model
        self._fields = len(model["flds"])
        self.initMapping()
        self.importNotes(data)