/**
 * `claudemesh me` — cross-mesh workspace overview for the caller's user.
 *
 * Calls GET /v1/me/workspace which aggregates over every mesh the
 * authenticated user belongs to: peer count, online count, topic count,
 * unread @-mention count per mesh + global totals.
 *
 * Auth: mints a temporary read-scoped REST apikey on whichever mesh
 * the user has joined first (any mesh works — the endpoint resolves
 * to the issuing user, not the apikey's mesh).
 *
 * v0.4.0 substrate. Future verbs (`me topics`, `me notifications`,
 * `me activity`, `me search`) layer on top of similar aggregating
 * endpoints once they ship.
 */

import { withRestKey } from "~/services/api/with-rest-key.js";
import { request } from "~/services/api/client.js";
import { render } from "~/ui/render.js";
import { bold, clay, cyan, dim, green, yellow } from "~/ui/styles.js";
import { EXIT } from "~/constants/exit-codes.js";

interface WorkspaceMesh {
  meshId: string;
  slug: string;
  name: string;
  memberId: string;
  myRole: string;
  joinedAt: string;
  peers: number;
  online: number;
  topics: number;
  unreadMentions: number;
}

interface WorkspaceResponse {
  userId: string;
  meshes: WorkspaceMesh[];
  totals: {
    meshes: number;
    peers: number;
    online: number;
    topics: number;
    unreadMentions: number;
  };
}

export interface MeFlags {
  mesh?: string;
  json?: boolean;
}

export async function runMe(flags: MeFlags): Promise<number> {
  return withRestKey(
    {
      meshSlug: flags.mesh ?? null,
      purpose: "workspace-overview",
      capabilities: ["read"],
    },
    async ({ secret }) => {
      const ws = await request<WorkspaceResponse>({
        path: "/api/v1/me/workspace",
        token: secret,
      });

      if (flags.json) {
        console.log(JSON.stringify(ws, null, 2));
        return EXIT.SUCCESS;
      }

      render.section(
        `${clay("workspace")} — ${bold(ws.userId.slice(0, 8))}  ${dim(
          `· ${ws.totals.meshes} mesh${ws.totals.meshes === 1 ? "" : "es"}`,
        )}`,
      );

      const totalsLine = [
        `${green(String(ws.totals.online))}/${ws.totals.peers} online`,
        `${ws.totals.topics} topic${ws.totals.topics === 1 ? "" : "s"}`,
        ws.totals.unreadMentions > 0
          ? yellow(`${ws.totals.unreadMentions} unread @you`)
          : dim("0 unread @you"),
      ].join(dim(" · "));
      process.stdout.write("  " + totalsLine + "\n\n");

      if (ws.meshes.length === 0) {
        process.stdout.write(
          dim("  no meshes joined — run `claudemesh new` or accept an invite\n"),
        );
        return EXIT.SUCCESS;
      }

      const slugWidth = Math.max(...ws.meshes.map((m) => m.slug.length), 8);
      for (const m of ws.meshes) {
        const slug = cyan(m.slug.padEnd(slugWidth));
        const peers = `${m.online}/${m.peers}`;
        const role = dim(m.myRole);
        const unread =
          m.unreadMentions > 0
            ? "  " + yellow(`${m.unreadMentions} @you`)
            : "";
        process.stdout.write(
          `  ${slug}  ${peers.padStart(5)} online  ${dim(
            String(m.topics).padStart(2) + " topics",
          )}  ${role}${unread}\n`,
        );
      }
      return EXIT.SUCCESS;
    },
  );
}

interface WorkspaceTopic {
  topicId: string;
  name: string;
  description: string | null;
  visibility: string;
  createdAt: string;
  meshId: string;
  meshSlug: string;
  meshName: string;
  memberId: string;
  unread: number;
  lastMessageAt: string | null;
}

interface WorkspaceTopicsResponse {
  topics: WorkspaceTopic[];
  totals: { topics: number; unread: number };
}

export interface MeTopicsFlags extends MeFlags {
  unread?: boolean;
}

export async function runMeTopics(flags: MeTopicsFlags): Promise<number> {
  return withRestKey(
    {
      meshSlug: flags.mesh ?? null,
      purpose: "workspace-topics",
      capabilities: ["read"],
    },
    async ({ secret }) => {
      const ws = await request<WorkspaceTopicsResponse>({
        path: "/api/v1/me/topics",
        token: secret,
      });

      const visible = flags.unread
        ? ws.topics.filter((t) => t.unread > 0)
        : ws.topics;

      if (flags.json) {
        console.log(
          JSON.stringify(
            { topics: visible, totals: ws.totals },
            null,
            2,
          ),
        );
        return EXIT.SUCCESS;
      }

      render.section(
        `${clay("topics")} — ${ws.totals.topics} across all meshes  ${dim(
          ws.totals.unread > 0
            ? `· ${ws.totals.unread} unread`
            : "· all read",
        )}`,
      );

      if (visible.length === 0) {
        process.stdout.write(
          dim(
            flags.unread
              ? "  no unread topics\n"
              : "  no topics — run `claudemesh topic create #general`\n",
          ),
        );
        return EXIT.SUCCESS;
      }

      const slugWidth = Math.max(...visible.map((t) => t.meshSlug.length), 6);
      const nameWidth = Math.max(...visible.map((t) => t.name.length), 8);

      for (const t of visible) {
        const slug = dim(t.meshSlug.padEnd(slugWidth));
        const name = cyan(t.name.padEnd(nameWidth));
        const unread =
          t.unread > 0
            ? yellow(`${t.unread} unread`.padStart(10))
            : dim("·".padStart(10));
        const last = t.lastMessageAt
          ? dim(formatRelativeTime(t.lastMessageAt))
          : dim("never");
        process.stdout.write(`  ${slug}  ${name}  ${unread}  ${last}\n`);
      }
      return EXIT.SUCCESS;
    },
  );
}

interface WorkspaceNotification {
  notificationId: string;
  messageId: string;
  topicId: string;
  topicName: string;
  meshId: string;
  meshSlug: string;
  meshName: string;
  senderName: string | null;
  snippet: string | null;
  ciphertext: string | null;
  bodyVersion: number;
  read: boolean;
  readAt: string | null;
  createdAt: string;
}

interface WorkspaceNotificationsResponse {
  notifications: WorkspaceNotification[];
  totals: { unread: number; total: number };
}

export interface MeNotificationsFlags extends MeFlags {
  all?: boolean;
  since?: string;
}

export async function runMeNotifications(
  flags: MeNotificationsFlags,
): Promise<number> {
  return withRestKey(
    {
      meshSlug: flags.mesh ?? null,
      purpose: "workspace-notifications",
      capabilities: ["read"],
    },
    async ({ secret }) => {
      const params = new URLSearchParams();
      if (flags.all) params.set("include", "all");
      if (flags.since) params.set("since", flags.since);
      const path =
        "/api/v1/me/notifications" +
        (params.toString() ? `?${params.toString()}` : "");
      const ws = await request<WorkspaceNotificationsResponse>({
        path,
        token: secret,
      });

      if (flags.json) {
        console.log(JSON.stringify(ws, null, 2));
        return EXIT.SUCCESS;
      }

      const headerLabel = flags.all ? "@-mentions (all)" : "@-mentions (unread)";
      render.section(
        `${clay(headerLabel)} — ${ws.totals.total} ${dim(
          ws.totals.unread > 0 ? `· ${ws.totals.unread} unread` : "· nothing pending",
        )}`,
      );

      if (ws.notifications.length === 0) {
        process.stdout.write(
          dim(
            flags.all
              ? "  no @-mentions in window\n"
              : "  inbox zero — nothing waiting\n",
          ),
        );
        return EXIT.SUCCESS;
      }

      const slugWidth = Math.max(
        ...ws.notifications.map((n) => n.meshSlug.length),
        6,
      );

      for (const n of ws.notifications) {
        const slug = dim(n.meshSlug.padEnd(slugWidth));
        const topic = cyan(`#${n.topicName}`);
        const sender = n.senderName ? `from ${n.senderName}` : "from ?";
        const ago = formatRelativeTime(n.createdAt);
        const dot = n.read ? dim("·") : yellow("●");
        const snippet =
          n.snippet ?? (n.ciphertext ? dim("[encrypted]") : dim("[empty]"));
        process.stdout.write(
          `  ${dot}  ${slug}  ${topic}  ${dim(sender)}  ${dim(ago)}\n` +
            `     ${snippet.length > 200 ? snippet.slice(0, 200) + "…" : snippet}\n`,
        );
      }
      return EXIT.SUCCESS;
    },
  );
}

function formatRelativeTime(iso: string): string {
  const then = new Date(iso).getTime();
  const now = Date.now();
  const sec = Math.max(0, Math.floor((now - then) / 1000));
  if (sec < 60) return `${sec}s ago`;
  if (sec < 3600) return `${Math.floor(sec / 60)}m ago`;
  if (sec < 86_400) return `${Math.floor(sec / 3600)}h ago`;
  if (sec < 86_400 * 30) return `${Math.floor(sec / 86_400)}d ago`;
  if (sec < 86_400 * 365)
    return `${Math.floor(sec / (86_400 * 30))}mo ago`;
  return `${Math.floor(sec / (86_400 * 365))}y ago`;
}