/**
 * OpenCode TUI Plugin: Show All Sessions
 *
 * Registers /sessions-all command to show all sessions
 * across all projects via a searchable picker dialog.
 * Selecting a session navigates directly to it.
 *
 * TUI format: export default { id, tui }
 *
 * Also intercepts MCP connection error toasts to keep them quiet.
 */

// ── Helpers ────────────────────────────────────────────────────────────

function formatDateTime(ms: number): string {
  const d = new Date(ms);
  const pad = (v: number) => String(v).padStart(2, "0");
  const month = pad(d.getMonth() + 1);
  const day = pad(d.getDate());
  const hour = pad(d.getHours());
  const min = pad(d.getMinutes());
  return `${d.getFullYear()}/${month}/${day} ${hour}:${min}`;
}

function projectDisplayName(
  session: any,
  projectMap: Map<string, any>,
): string {
  const project = session.projectID
    ? projectMap.get(session.projectID)
    : undefined;
  // Try project name first
  if (project?.name?.trim()) return project.name.trim();
  // Try worktree basename
  const worktree = project?.worktree
    ?.replace(/\/+$/, "")
    .split(/[\\/]/)
    .pop();
  if (worktree) return worktree;
  // Try directory basename
  const dir = session.directory
    ?.replace(/\/+$/, "")
    .split(/[\\/]/)
    .pop();
  if (dir) return dir;
  // Fallback to truncated project ID
  return session.projectID ? session.projectID.slice(0, 8) : "unknown";
}

// ── Plugin ─────────────────────────────────────────────────────────────

const tui = async (api: any) => {
  // ─── MCP Error Toast Suppression ─────────────────────────────────────
  // Listen for toast events and suppress MCP-related error toasts.
  // This keeps the UI clean when baota-mcp server is offline.
  // When the server comes back online, tools auto-reconnect.
  api.event.on("tui.toast.show", (event: any) => {
    const props = event.properties;
    if (
      props.variant === "error" &&
      typeof props.message === "string" &&
      (props.message.toLowerCase().includes("mcp") ||
        props.message.toLowerCase().includes("mcp server") ||
        props.message.toLowerCase().includes("mcp error") ||
        props.message.toLowerCase().includes("failed to connect") ||
        props.message.toLowerCase().includes("connection refused"))
    ) {
      // Replace the error message with a silent info toast
      props.variant = "info";
      props.message = "MCP server offline (auto-reconnect when available)";
      props.duration = 2000;
    }
  });

  // ─── Session Picker Dialog ────────────────────────────────────────────
  const openPicker = async () => {
    // Only work in base mode (not in a permission dialog etc.)
    if (api.mode.current() !== "base") return;

    let sessions: any[] = [];
    let projects: any[] = [];

    try {
      // Use experimental.session.list to get all sessions across projects
      const [sessionResult, projectResult] = await Promise.all([
        api.client.experimental.session.list({
          limit: 1000,
          roots: true,
          directory: "",
        }),
        api.client.project.list({}),
      ]);

      sessions = sessionResult?.data ?? sessionResult ?? [];
      projects = projectResult?.data ?? projectResult ?? [];
    } catch (err) {
      api.ui.toast({
        message: "Failed to load sessions",
        variant: "error",
      });
      return;
    }

    if (!Array.isArray(sessions) || !Array.isArray(projects)) return;

    // Build project lookup map
    const projectMap = new Map(projects.map((p: any) => [p.id, p]));

    // Filter: hide archived and subagent sessions
    const visible = sessions.filter(
      (s: any) => !s.time?.archived && !s.parentID,
    );

    if (visible.length === 0) {
      api.ui.toast({
        message: "No sessions found",
        variant: "warning",
      });
      return;
    }

    // Group by project
    const grouped = new Map<string, any[]>();
    for (const session of visible) {
      const name = projectDisplayName(session, projectMap);
      const list = grouped.get(name) ?? [];
      list.push(session);
      grouped.set(name, list);
    }

    // Sort sessions within each project by update time (newest first)
    for (const list of grouped.values()) {
      list.sort(
        (a: any, b: any) => (b.time?.updated ?? 0) - (a.time?.updated ?? 0),
      );
    }

    // Sort projects alphabetically
    const orderedProjects = [...grouped.keys()].sort((a, b) =>
      a.localeCompare(b),
    );

    // Build dialog options
    const options = orderedProjects.flatMap((project) =>
      grouped.get(project)!.map((session: any) => {
        const updated = session.time?.updated
          ? formatDateTime(session.time.updated)
          : "unknown";
        const title = session.title || "Untitled";
        return {
          title: `${project}  ${updated}  \u2502  ${title}`,
          value: session.id,
          category: project,
        };
      }),
    );

    // Show the dialog
    api.ui.dialog.setSize("xlarge");
    api.ui.dialog.replace(
      () =>
        api.ui.DialogSelect({
          title: "All Sessions",
          placeholder: "Search sessions across all projects\u2026",
          options,
          onSelect: (option: any) => {
            api.ui.dialog.clear();
            api.route.navigate("session", { sessionID: option.value });
          },
        }),
      () => {},
    );
  };

  // ─── Register Command ─────────────────────────────────────────────────
  // Register /sessions-all as a slash command
  if (api.command) {
    api.command.register(() => [
      {
        title: "All Sessions",
        value: "sessions.all",
        description: "Browse and switch to any session across all projects",
        category: "Session Picker",
        slash: { name: "sessions-all", aliases: ["resume-all", "continue-all"] },
        onSelect: () => {
          void openPicker();
        },
      },
    ]);
  }

  // ─── Keybinding ───────────────────────────────────────────────────────
  // Ctrl+o: dedicated fallback keybinding to open the picker
  api.keymap.registerLayer({
    bindings: [
      {
        key: "ctrl+o",
        desc: "All sessions picker",
        preventDefault: true,
        cmd: () => void openPicker(),
      },
    ],
  });
};

// ── Export ──────────────────────────────────────────────────────────────

export default { id: "oc-session-all", tui };