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# Source code for betty.extension.cotton_candy

    """
    Provide Betty's default theme.
    """

    from __future__ import annotations

    from collections import defaultdict
    from pathlib import Path
    from typing import Iterable, cast, TYPE_CHECKING, final

    from betty import fs
    from betty.extension.cotton_candy.config import CottonCandyConfiguration
    from betty.extension.cotton_candy.search import Index
    from betty.extension.maps import Maps
    from betty.extension.trees import Trees
    from betty.extension.webpack import Webpack, WebpackEntryPointProvider
    from betty.functools import Uniquifier
    from betty.generate import GenerateSiteEvent
    from betty.html import CssProvider
    from betty.jinja2 import (
        Jinja2Provider,
        context_project,
        context_localizer,
        context_job_context,
        Globals,
        Filters,
    )
    from betty.locale.date import Date, Datey
    from betty.locale.localizable import _, static, Localizable
    from betty.model import GeneratedEntityId
    from betty.model.ancestry import (
        Event,
        Person,
        Presence,
        is_public,
        HasFileReferences,
        Place,
        FileReference,
    )
    from betty.model.event_type import StartOfLifeEventType, EndOfLifeEventType
    from betty.model.presence_role import Subject
    from betty.os import link_or_copy
    from betty.project.extension import ConfigurableExtension, Theme
    from jinja2 import pass_context
    from typing_extensions import override

    if TYPE_CHECKING:
        from betty.event_dispatcher import EventHandlerRegistry
        from betty.machine_name import MachineName
        from jinja2.runtime import Context
        from collections.abc import Sequence, AsyncIterable

    async def _generate_favicon(event: GenerateSiteEvent) -> None:
        cotton_candy = event.project.extensions[CottonCandy.plugin_id()]
        assert isinstance(cotton_candy, CottonCandy)
        await link_or_copy(
            cotton_candy.logo, event.project.configuration.www_directory_path / "logo.png"
        )

    @final
    class CottonCandy(
        Theme,
        CssProvider,
        ConfigurableExtension[CottonCandyConfiguration],
        Jinja2Provider,
        WebpackEntryPointProvider,
    ):
        """
        Provide Betty's default front-end theme.
        """

        @override
        @classmethod
        def plugin_id(cls) -> MachineName:
            return "cotton-candy"

        @override
        def register_event_handlers(self, registry: EventHandlerRegistry) -> None:
            registry.add_handler(GenerateSiteEvent, _generate_favicon)

        @override
        @classmethod
        def depends_on(cls) -> set[MachineName]:
            return {Webpack.plugin_id()}

        @override
        @classmethod
        def comes_after(cls) -> set[MachineName]:
            return {Maps.plugin_id(), Trees.plugin_id()}

        @override
        @classmethod
        def assets_directory_path(cls) -> Path:
            return Path(__file__).parent / "assets"

        @override
        @classmethod
        def webpack_entry_point_directory_path(cls) -> Path:
            return Path(__file__).parent / "webpack"

        @override
        def webpack_entry_point_cache_keys(self) -> Sequence[str]:
            return (
                self.project.configuration.root_path,
                self._configuration.primary_inactive_color.hex,
                self._configuration.primary_active_color.hex,
                self._configuration.link_inactive_color.hex,
                self._configuration.link_active_color.hex,
            )

        @override
        @property
        def public_css_paths(self) -> list[str]:
            return [
                self.project.static_url_generator.generate("css/cotton-candy.css"),
            ]

        @override
        @classmethod
        def plugin_label(cls) -> Localizable:
            return static("Cotton Candy")

        @override
        @classmethod
        def default_configuration(cls) -> CottonCandyConfiguration:
            return CottonCandyConfiguration()

        @override
        @classmethod
        def plugin_description(cls) -> Localizable:
            return _("Cotton Candy is Betty's default theme.")

        @property
        def logo(self) -> Path:
            """
            The path to the logo file.
            """
            return (
                self._configuration.logo
                or fs.ASSETS_DIRECTORY_PATH / "public" / "static" / "betty-512x512.png"
            )

        @override
        @property
        def globals(self) -> Globals:
            return {
                "search_index": _global_search_index,
            }

        @override
        @property
        def filters(self) -> Filters:
            return {
                "person_timeline_events": lambda person: person_timeline_events(
                    person, self.project.configuration.lifetime_threshold
                ),
                "person_descendant_families": person_descendant_families,
                "associated_file_references": associated_file_references,
            }

    @pass_context
    async def _global_search_index(context: Context) -> AsyncIterable[dict[str, str]]:
        return Index(
            context_project(context),
            context_job_context(context),
            context_localizer(context),
        ).build()

    def _is_person_timeline_presence(presence: Presence) -> bool:
        if presence.private:
            return False
        if not presence.event:
            return False
        if not presence.event.date:
            return False
        if not presence.event.date.comparable:
            return False
        return True

    def person_timeline_events(person: Person, lifetime_threshold: int) -> Iterable[Event]:
        """
        Gather all events for a person's timeline.
        """
        yield from Uniquifier(_person_timeline_events(person, lifetime_threshold))

    def person_descendant_families(
        person: Person,
    ) -> Iterable[tuple[Sequence[Person], Sequence[Person]]]:
        """
        Gather a person's families they are a parent in.
        """
        parents = {}
        children = defaultdict(set)
        for child in person.children:
            family = tuple(sorted((parent.id for parent in child.parents)))
            if family not in parents:
                parents[family] = tuple(child.parents)
            children[family].add(child)
        yield from zip(parents.values(), children.values())

    def associated_file_references(
        has_file_references: HasFileReferences,
    ) -> Iterable[FileReference]:
        """
        Get the associated file references for an entity that has file references.
        """
        yield from Uniquifier(
            _associated_file_references(has_file_references),
            key=lambda file_reference: file_reference.file,
        )

    def _associated_file_references(
        has_file_references: HasFileReferences,
    ) -> Iterable[FileReference]:
        yield from has_file_references.file_references

        if isinstance(has_file_references, Event):
            for citation in has_file_references.citations:
                yield from _associated_file_references(citation)

        if isinstance(has_file_references, Person):
            for name in has_file_references.names:
                for citation in name.citations:
                    yield from _associated_file_references(citation)
            for presence in has_file_references.presences:
                if presence.event is not None:
                    yield from _associated_file_references(presence.event)

        if isinstance(has_file_references, Place):
            for event in has_file_references.events:
                yield from _associated_file_references(event)

    def _person_timeline_events(person: Person, lifetime_threshold: int) -> Iterable[Event]:
        # Collect all associated events for a person.
        # Start with the person's own events for which their presence is public.
        for presence in person.presences:
            if _is_person_timeline_presence(presence):
                assert presence.event is not None
                yield presence.event
            continue

        # If the person has start- or end-of-life events, we use those to constrain associated people's events.
        start_dates = []
        end_dates = []
        for presence in person.presences:
            if not _is_person_timeline_presence(presence):
                continue
            assert presence.event is not None
            assert presence.event.date is not None
            if not isinstance(presence.role, Subject):
                continue
            if isinstance(presence.event.event_type, StartOfLifeEventType):
                start_dates.append(presence.event.date)
            if isinstance(presence.event.event_type, EndOfLifeEventType):
                end_dates.append(presence.event.date)
        start_date = sorted(start_dates)[0] if start_dates else None
        end_date = sorted(end_dates)[0] if end_dates else None

        # If an end-of-life event exists, but no start-of-life event, create a start-of-life date based on the end date,
        # minus the lifetime threshold.
        if start_date is None and end_date is not None:
            if isinstance(end_date, Date):
                start_date_reference = end_date
            else:
                if end_date.end is not None and end_date.end.comparable:
                    start_date_reference = end_date.end
                else:
                    assert end_date.start is not None
                    start_date_reference = end_date.start
            assert start_date_reference.year is not None
            start_date = Date(
                start_date_reference.year - lifetime_threshold,
                start_date_reference.month,
                start_date_reference.day,
                start_date_reference.fuzzy,
            )

        # If a start-of-life event exists, but no end-of-life event, create an end-of-life date based on the start date,
        # plus the lifetime threshold.
        if end_date is None and start_date is not None:
            if isinstance(start_date, Date):
                end_date_reference = start_date
            else:
                if start_date.start and start_date.start.comparable:
                    end_date_reference = start_date.start
                else:
                    assert start_date.end is not None
                    end_date_reference = start_date.end
            assert end_date_reference.year is not None
            end_date = Date(
                end_date_reference.year + lifetime_threshold,
                end_date_reference.month,
                end_date_reference.day,
                end_date_reference.fuzzy,
            )

        if start_date is None or end_date is None:
            reference_dates = sorted(
                cast(Datey, cast(Event, presence.event).date)
                for presence in person.presences
                if _is_person_timeline_presence(presence)
            )
            if reference_dates:
                if not start_date:
                    start_date = reference_dates[0]
                if not end_date:
                    end_date = reference_dates[-1]

        if start_date is not None and end_date is not None:
            associated_people = filter(
                is_public,
                (
                    # All ancestors.
                    *person.ancestors,
                    # All descendants.
                    *person.descendants,
                    # All siblings.
                    *person.siblings,
                ),
            )
            for associated_person in associated_people:
                # For associated events, we are only interested in people's start- or end-of-life events.
                for associated_presence in associated_person.presences:
                    if not associated_presence.event or not isinstance(
                        associated_presence.event.event_type,
                        (StartOfLifeEventType, EndOfLifeEventType),
                    ):
                        continue
                    if isinstance(associated_presence.event.id, GeneratedEntityId):
                        continue
                    if not isinstance(associated_presence.role, Subject):
                        continue
                    if not _is_person_timeline_presence(associated_presence):
                        continue
                    if not associated_presence.event.date:
                        continue
                    if associated_presence.event.date < start_date:
                        continue
                    if associated_presence.event.date > end_date:
                        continue
                    yield associated_presence.event