import { get } from "./api.js";
export const state = {
    me: undefined,
    projects: [],
    tasks: new Map(),
    sessions: new Map(),
    inbox: [],
    selectedTaskId: undefined,
    transcript: [],
    lastTranscriptSeq: 0,
    connected: false,
};
const listeners = new Map();
export function on(topic, fn) {
    let set = listeners.get(topic);
    if (!set) {
        set = new Set();
        listeners.set(topic, set);
    }
    set.add(fn);
    return () => set.delete(fn);
}
export function onEach(topics, fn) {
    const offs = topics.map((t) => on(t, fn));
    return () => {
        for (const off of offs) {
            off();
        }
    };
}
export function activeTasks() {
    return state.projects.flatMap((project) => (state.tasks.get(project.id) ?? []).filter((t) => t.status === "active").map((task) => ({ project, task })));
}
export function notify(topic, detail) {
    for (const fn of listeners.get(topic) ?? []) {
        fn(detail);
    }
}
export function findTask(id) {
    for (const tasks of state.tasks.values()) {
        const task = tasks.find((t) => t.id === id);
        if (task) {
            return task;
        }
    }
    return undefined;
}
export function currentSession(taskId) {
    return state.sessions.get(taskId)?.findLast((s) => s.state !== "completed") ?? state.sessions.get(taskId)?.at(-1);
}
export async function loadMe() {
    state.me = await get("/api/me");
    notify("me");
}
export async function loadProjects() {
    state.projects = await get("/api/projects");
    await Promise.all(state.projects.map((p) => loadTasks(p.id)));
    notify("projects");
}
export async function loadTasks(projectId) {
    const tasks = await get("/api/projects/{projectId}/tasks", { path: { projectId } });
    state.tasks.set(projectId, tasks);
    await Promise.all(tasks.filter((t) => t.status === "active").map((t) => loadSessions(t.id)));
    notify("tasks");
}
export async function loadSessions(taskId) {
    state.sessions.set(taskId, await get("/api/tasks/{taskId}/sessions", { path: { taskId } }));
    notify("sessions", taskId);
}
export async function loadInbox() {
    state.inbox = await get("/api/inbox");
    notify("inbox");
}
let liveDuringLoad;
export async function selectTask(taskId) {
    state.selectedTaskId = taskId;
    state.transcript = [];
    state.lastTranscriptSeq = 0;
    liveDuringLoad = undefined;
    notify("selection");
    if (!taskId) {
        return;
    }
    const held = [];
    liveDuringLoad = held;
    for (;;) {
        const page = await get("/api/tasks/{taskId}/events", { path: { taskId }, query: { after: state.lastTranscriptSeq, limit: 1000 } });
        if (state.selectedTaskId !== taskId || liveDuringLoad !== held) {
            return;
        }
        appendTranscript(page);
        if (page.length < 1000) {
            break;
        }
    }
    liveDuringLoad = undefined;
    appendTranscript(held);
}
function appendTranscript(events) {
    const fresh = events.filter((ev) => ev.seq > state.lastTranscriptSeq);
    if (fresh.length === 0) {
        return;
    }
    state.transcript.push(...fresh);
    state.lastTranscriptSeq = fresh.at(-1).seq;
    notify("transcript", fresh);
}
export function handleEvent(ev) {
    if (ev.seq === 0) {
        if (ev.task_id && ev.task_id === state.selectedTaskId && !liveDuringLoad) {
            notify("stream", ev);
        }
        return;
    }
    if (ev.task_id && ev.task_id === state.selectedTaskId) {
        if (liveDuringLoad) {
            liveDuringLoad.push(ev);
        }
        else {
            appendTranscript([ev]);
        }
    }
    switch (ev.kind) {
        case "user.updated":
            if (ev.payload["login"] === state.me?.login) {
                void loadMe();
            }
            break;
        case "project.created":
            void loadProjects();
            break;
        case "task.created":
        case "task.merge_title":
        case "task.merged":
        case "task.discarded":
            if (ev.project_id) {
                void loadTasks(ev.project_id);
            }
            break;
        case "session.created":
        case "session.state":
        case "session.model":
            if (ev.task_id) {
                void loadSessions(ev.task_id);
            }
            break;
        case "inbox.created":
        case "inbox.updated":
            void loadInbox();
            break;
    }
    notify("event", ev);
}
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