//! State actions capture their own diagram; architecture selection stays separate.
use super::{
    state_edit::{self, Endpoint, Event, Tool},
    states,
};
use crate::{
    app::{App, Message},
    context_menu::{Entry, Menu},
    model_menu::{self, Opened},
};
use oa_core::*;

pub fn popup(app: &App, opened: &Opened, clean: bool) -> Option<Menu<Message>> {
    let project = app.project();
    let machine = super::selected_owner(app)
        .filter(|id| project.elements[id].kind() == Kind::StateMachine)?;
    let context = app.state_context();
    let request = &opened.request;
    let id = request.object;
    let item = |caption: &str, message: Message, enabled: bool| {
        if clean && enabled {
            Entry::action(
                caption,
                Message::Menu(model_menu::Event::Invoke(opened.token, Box::new(message))),
            )
        } else {
            Entry::disabled(caption)
        }
    };
    let diagram_event = Message::StateDiagram;
    let form = |tool| {
        Message::Behavior(super::Event::States(states::Event::Start(
            machine, tool, id,
        )))
    };
    let mut entries = vec![Entry::title(crate::views::short(project.named(id), 38))];
    if !clean {
        entries.push(Entry::title("Apply or cancel pending edits first"));
    }

    if let Some(context) = context.filter(|context| context.diagram == id) {
        entries.extend([
            item("View properties", Message::EditProperties(id), true),
            item("Duplicate view", Message::DuplicateDiagram(id), true),
            item("Fit diagram", diagram_event(Event::Fit(context)), true),
            item(
                "Create another state view",
                diagram_event(Event::CreateView(machine)),
                true,
            ),
            Entry::separator(),
            item(
                "Create region…",
                diagram_event(Event::Choose(Tool::Region)),
                true,
            ),
            item(
                "New transition with details…",
                form(states::Tool::Transition),
                true,
            ),
        ]);
    } else {
        entries.extend([
            item("Properties", Message::EditProperties(id), true),
            item("Open source", Message::SourceForSelection, true),
            item(
                "Connections & references",
                Message::InspectorTab(crate::navigation::InspectorTab::Connections),
                true,
            ),
        ]);
        if let Some(element) = project.elements.get(&id)
            && projection::state_machine_contains(project, machine, id)
        {
            entries.push(Entry::separator());
            let creates = if element.kind() == Kind::Region {
                Some((
                    "Create state…",
                    Kind::State,
                    states::Tool::Vertex,
                    Tool::Vertex(Kind::State),
                ))
            } else if element.kind() == Kind::StateMachine || element.kind().is_stable_state() {
                Some((
                    "Create region…",
                    Kind::Region,
                    states::Tool::Region,
                    Tool::Region,
                ))
            } else {
                None
            };
            if let Some((caption, kind, typed, tool)) = creates {
                entries.push(if let Some(context) = context {
                    item(
                        caption,
                        diagram_event(Event::Choose(tool)),
                        state_edit::eligible_owner(project, context.diagram, id, kind),
                    )
                } else {
                    item(caption, form(typed), true)
                });
            }
            entries.push(item(
                "New transition with details…",
                form(states::Tool::Transition),
                true,
            ));
            if let Some(context) = context
                && let Some(node) = request
                    .placement
                    .and_then(|placement| project.diagrams[&context.diagram].nodes.get(&placement))
                    .filter(|node| node.element == id)
            {
                entries.push(Entry::separator());
                entries.push(item(
                    "Placement properties",
                    Message::EditProperties(node.id),
                    true,
                ));
                if element.kind() == Kind::StateMachine
                    || element.kind() == Kind::Region
                    || element.kind().is_stable_state()
                {
                    let mut changed = node.clone();
                    changed.collapsed = !changed.collapsed;
                    entries.push(item(
                        if node.collapsed {
                            "Unfold contents"
                        } else {
                            "Fold contents"
                        },
                        Message::Command(Command::EditNode {
                            diagram: context.diagram,
                            original: node.id,
                            node: changed,
                        }),
                        true,
                    ));
                }
                entries.push(item(
                    "Hide from this diagram",
                    Message::Command(Command::Delete(node.id)),
                    true,
                ));
            }
        }
        if let Some(relation) = project.relations.get(&id)
            && relation.kind() == RelationKind::StateTransition
            && projection::state_machine_contains(project, machine, relation.source())
            && projection::state_machine_contains(project, machine, relation.target())
        {
            entries.push(Entry::separator());
            let edit = context.map_or_else(
                || Message::Behavior(super::Event::States(states::Event::Edit(id))),
                |context| diagram_event(Event::EditTransition(context, id)),
            );
            entries.push(item("Edit transition", edit, true));
            if let Some(context) = context {
                let visible = projection::project_view(project, context.diagram)
                    .edges
                    .iter()
                    .any(|edge| edge.id == id);
                for (caption, endpoint) in [
                    ("Reconnect source", Endpoint::Source),
                    ("Reconnect target", Endpoint::Target),
                ] {
                    entries.push(item(
                        caption,
                        diagram_event(Event::Choose(Tool::Reconnect {
                            relation: id,
                            endpoint,
                        })),
                        visible,
                    ));
                }
                if !visible {
                    entries.push(Entry::title(
                        "Use transition details for hidden or internal endpoints",
                    ));
                }
            }
        }
        if id != project.id {
            entries.push(Entry::separator());
            entries.push(item("Delete from model…", Message::Delete, true));
        }
    }
    Some(Menu {
        token: opened.token,
        anchor: request.anchor,
        entries,
        on_close: Message::Menu(model_menu::Event::Close),
    })
}