/**
 * Unit tests for DIS-151: channel categorization + lifecycle management
 *
 * Covers reconcile(), handleChannelDelete(), ensureCategories() with
 * mocked node:fs and Discord.js Guild objects.
 *
 * All path comparisons use path.join() so tests pass on Windows and Unix.
 */

import { describe, it, expect, vi, beforeEach } from "vitest";
import type { MockInstance } from "vitest";
import * as path from "node:path";

// ---------------------------------------------------------------------------
// Mock node:fs — must be hoisted before any imports that use it
// ---------------------------------------------------------------------------
vi.mock("node:fs", () => {
  return {
    existsSync: vi.fn(() => false),
    readdirSync: vi.fn(() => [] as string[]),
    statSync: vi.fn(() => ({ isDirectory: () => true })),
    readFileSync: vi.fn(() => ""),
    rmSync: vi.fn(),
    mkdirSync: vi.fn(),
    writeFileSync: vi.fn(),
  };
});

import * as nodefs from "node:fs";

// ---------------------------------------------------------------------------
// Helpers to build mock Discord structures
// ---------------------------------------------------------------------------

/** A Collection-like Map that also has Discord.js Collection.find() */
function makeCollection<V>(entries: [string, V][] = []) {
  const m = new Map<string, V>(entries);
  (m as unknown as { find: (fn: (v: V) => boolean) => V | undefined }).find = (fn: (v: V) => boolean) => {
    for (const v of m.values()) {
      if (fn(v)) return v;
    }
    return undefined;
  };
  return m as Map<string, V> & { find: (fn: (v: V) => boolean) => V | undefined };
}

type AnyChannelObj = {
  id: string;
  name: string;
  type: number;
  setParent: ReturnType<typeof vi.fn>;
  guild?: unknown;
};

function makeCategoryChannel(id: string, name: string): AnyChannelObj {
  return {
    id,
    name,
    type: 4, // ChannelType.GuildCategory = 4
    setParent: vi.fn().mockResolvedValue(undefined),
  };
}

function makeTextChannel(id: string, name: string): AnyChannelObj {
  return {
    id,
    name,
    type: 0, // ChannelType.GuildText = 0
    setParent: vi.fn().mockResolvedValue(undefined),
  };
}

function makeGuild(channels: AnyChannelObj[]) {
  const cache = makeCollection(channels.map((c) => [c.id, c] as [string, AnyChannelObj]));

  const guild: {
    id: string;
    name: string;
    channels: {
      cache: typeof cache;
      fetch: ReturnType<typeof vi.fn>;
      create: ReturnType<typeof vi.fn>;
    };
  } = {
    id: "guild-1",
    name: "Test Guild",
    channels: {
      cache,
      fetch: vi.fn().mockResolvedValue(cache),
      create: vi.fn().mockImplementation(({ name, type }: { name: string; type: number }) => {
        const newId = `created-${name}`;
        let ch: AnyChannelObj;
        if (type === 4) {
          ch = makeCategoryChannel(newId, name);
        } else {
          ch = makeTextChannel(newId, name);
        }
        ch.guild = guild;
        cache.set(newId, ch);
        return Promise.resolve(ch);
      }),
    },
  };

  // Attach guild reference to all channels so moveToCategory can access cache
  for (const ch of channels) {
    ch.guild = guild;
  }

  return guild;
}

type MockGuild = ReturnType<typeof makeGuild>;

function makeDb(workspaces: Array<{ id: number; channel_id: string; agent_name: string; workspace_path: string; guild_id?: string; created_at?: string }>) {
  const rows = workspaces.map((w) => ({
    id: w.id,
    channel_id: w.channel_id,
    guild_id: w.guild_id ?? "guild-1",
    agent_name: w.agent_name,
    workspace_path: w.workspace_path,
    created_at: w.created_at ?? "2025-01-01T00:00:00Z",
  }));

  return {
    getAllWorkspaces: vi.fn(() => [...rows]),
    getWorkspaceByChannelId: vi.fn((channelId: string) =>
      rows.find((r) => r.channel_id === channelId)
    ),
    getWorkspaceByName: vi.fn((name: string) =>
      rows.find((r) => r.agent_name === name)
    ),
    createWorkspace: vi.fn(),
    deleteWorkspaceByChannelId: vi.fn((channelId: string) => {
      const idx = rows.findIndex((r) => r.channel_id === channelId);
      if (idx === -1) return false;
      rows.splice(idx, 1);
      return true;
    }),
    addConversation: vi.fn(),
    getConversationHistory: vi.fn(() => []),
    close: vi.fn(),
  };
}

// ---------------------------------------------------------------------------
// Import modules under test (after mocks are registered)
// ---------------------------------------------------------------------------
import { reconcile } from "../../src/lifecycle/reconcile";
import { handleChannelDelete } from "../../src/lifecycle/channel-delete-handler";
import { ensureCategories } from "../../src/lifecycle/categories";

// Helpers for typed mock access
const fsMock = nodefs as unknown as {
  existsSync: MockInstance;
  readdirSync: MockInstance;
  statSync: MockInstance;
  readFileSync: MockInstance;
  rmSync: MockInstance;
};

// ---------------------------------------------------------------------------
// Shared category setup — categories share guild's cache
// ---------------------------------------------------------------------------
function makeCategories(guild: MockGuild) {
  const active = makeCategoryChannel("cat-active", "🟢 Aktive Agents");
  const inactive = makeCategoryChannel("cat-inactive", "🔴 Inaktive Agents");
  const archive = makeCategoryChannel("cat-archive", "🗄️ Archiv");
  active.guild = guild;
  inactive.guild = guild;
  archive.guild = guild;

  // Add to guild cache so the category lookup in moveToCategory works
  guild.channels.cache.set(active.id, active);
  guild.channels.cache.set(inactive.id, inactive);
  guild.channels.cache.set(archive.id, archive);

  return { active, inactive, archive } as unknown as Awaited<ReturnType<typeof ensureCategories>>;
}

const WORKSPACES_ROOT = path.resolve("/fake/workspaces");
const MGMT_CHANNEL_ID = "mgmt-111";

beforeEach(() => {
  vi.clearAllMocks();
  // Default: workspacesRoot does not exist
  fsMock.existsSync.mockReturnValue(false);
  fsMock.readdirSync.mockReturnValue([]);
});

// ===========================================================================
// reconcile() tests
// ===========================================================================

describe("reconcile()", () => {
  // -------------------------------------------------------------------------
  // Test 1: aktiv — DB entry + workspace dir + Discord channel all exist
  // -------------------------------------------------------------------------
  it("1: aktiv: DB + Workspace + Channel → moveToCategory(active) aufgerufen", async () => {
    const agentCh = makeTextChannel("ch-agent-1", "my-agent");
    const guild = makeGuild([agentCh]);
    const categories = makeCategories(guild);

    const wsPath = path.join(WORKSPACES_ROOT, "my-agent");
    const db = makeDb([
      { id: 1, channel_id: "ch-agent-1", agent_name: "my-agent", workspace_path: wsPath },
    ]);

    const yamlPath = path.join(WORKSPACES_ROOT, "my-agent", "agent.yaml");
    fsMock.existsSync.mockImplementation((p: string) => {
      if (p === WORKSPACES_ROOT) return true;
      if (p === wsPath) return true;
      if (p === yamlPath) return true;
      return false;
    });
    fsMock.readdirSync.mockReturnValue(["my-agent"]);
    fsMock.statSync.mockReturnValue({ isDirectory: () => true });
    fsMock.readFileSync.mockReturnValue('name: my-agent\nchannel_id: "ch-agent-1"\n');

    const result = await reconcile(
      guild as unknown as Parameters<typeof reconcile>[0],
      db as unknown as Parameters<typeof reconcile>[1],
      categories,
      WORKSPACES_ROOT,
      MGMT_CHANNEL_ID
    );

    expect(result.active).toContain("ch-agent-1");
    expect(agentCh.setParent).toHaveBeenCalledWith(categories.active.id);
  });

  // -------------------------------------------------------------------------
  // Test 2: inaktiv — DB entry exists but channel is NOT in guild
  // -------------------------------------------------------------------------
  it("2: inaktiv: DB + kein Channel → in result.inactive", async () => {
    const guild = makeGuild([]);
    const categories = makeCategories(guild);

    const wsPath = path.join(WORKSPACES_ROOT, "ghost-agent");
    const db = makeDb([
      { id: 1, channel_id: "ch-ghost", agent_name: "ghost-agent", workspace_path: wsPath },
    ]);

    fsMock.existsSync.mockReturnValue(false);

    const result = await reconcile(
      guild as unknown as Parameters<typeof reconcile>[0],
      db as unknown as Parameters<typeof reconcile>[1],
      categories,
      WORKSPACES_ROOT,
      MGMT_CHANNEL_ID
    );

    expect(result.inactive).toContain("ch-ghost");
    expect(result.active).not.toContain("ch-ghost");
  });

  // -------------------------------------------------------------------------
  // Test 3: inaktiv — workspace dir with agent.yaml exists but no DB entry
  //         and channel IS in guild
  // -------------------------------------------------------------------------
  it("3: inaktiv: Workspace + kein DB → moveToCategory(inactive) aufgerufen", async () => {
    const agentCh = makeTextChannel("ch-orphan", "orphan-agent");
    const guild = makeGuild([agentCh]);
    const categories = makeCategories(guild);

    const db = makeDb([]);

    const yamlPath = path.join(WORKSPACES_ROOT, "orphan-agent", "agent.yaml");
    fsMock.existsSync.mockImplementation((p: string) => {
      if (p === WORKSPACES_ROOT) return true;
      if (p === yamlPath) return true;
      return false;
    });
    fsMock.readdirSync.mockReturnValue(["orphan-agent"]);
    fsMock.statSync.mockReturnValue({ isDirectory: () => true });
    fsMock.readFileSync.mockReturnValue('name: orphan-agent\nchannel_id: "ch-orphan"\n');

    const result = await reconcile(
      guild as unknown as Parameters<typeof reconcile>[0],
      db as unknown as Parameters<typeof reconcile>[1],
      categories,
      WORKSPACES_ROOT,
      MGMT_CHANNEL_ID
    );

    expect(result.inactive).toContain("ch-orphan");
    expect(agentCh.setParent).toHaveBeenCalledWith(categories.inactive.id);
  });

  // -------------------------------------------------------------------------
  // Test 4: archiv — text channel in guild with no DB entry and no workspace
  // -------------------------------------------------------------------------
  it("4: archiv: Channel ohne DB und Workspace → moveToCategory(archive) aufgerufen", async () => {
    const randomCh = makeTextChannel("ch-random", "random-channel");
    const guild = makeGuild([randomCh]);
    const categories = makeCategories(guild);

    const db = makeDb([]);

    fsMock.existsSync.mockReturnValue(false);
    fsMock.readdirSync.mockReturnValue([]);

    const result = await reconcile(
      guild as unknown as Parameters<typeof reconcile>[0],
      db as unknown as Parameters<typeof reconcile>[1],
      categories,
      WORKSPACES_ROOT,
      MGMT_CHANNEL_ID
    );

    expect(result.archived).toContain("ch-random");
    expect(randomCh.setParent).toHaveBeenCalledWith(categories.archive.id);
  });

  // -------------------------------------------------------------------------
  // Test 5: cleanup — workspace dir exists but no channel and no DB entry
  //         → directory is deleted
  // -------------------------------------------------------------------------
  it("5: cleanup: Workspace ohne Channel und DB → fs.rmSync aufgerufen", async () => {
    const guild = makeGuild([]);
    const categories = makeCategories(guild);

    const db = makeDb([]);

    const deadDir = path.join(WORKSPACES_ROOT, "dead-agent");
    const deadYaml = path.join(WORKSPACES_ROOT, "dead-agent", "agent.yaml");
    fsMock.existsSync.mockImplementation((p: string) => {
      if (p === WORKSPACES_ROOT) return true;
      if (p === deadYaml) return true;
      return false;
    });
    fsMock.readdirSync.mockReturnValue(["dead-agent"]);
    fsMock.statSync.mockReturnValue({ isDirectory: () => true });
    fsMock.readFileSync.mockReturnValue('name: dead-agent\nchannel_id: "ch-dead"\n');

    const result = await reconcile(
      guild as unknown as Parameters<typeof reconcile>[0],
      db as unknown as Parameters<typeof reconcile>[1],
      categories,
      WORKSPACES_ROOT,
      MGMT_CHANNEL_ID
    );

    expect(fsMock.rmSync).toHaveBeenCalledWith(
      deadDir,
      expect.objectContaining({ recursive: true })
    );
    expect(result.deletedWorkspaces).toContain("dead-agent");
  });

  // -------------------------------------------------------------------------
  // Test 6: management channel is never categorized
  // -------------------------------------------------------------------------
  it("6: management-channel übersprungen — wird nicht kategorisiert", async () => {
    const mgmtCh = makeTextChannel(MGMT_CHANNEL_ID, "disclaw");
    const guild = makeGuild([mgmtCh]);
    const categories = makeCategories(guild);

    const db = makeDb([]);
    fsMock.existsSync.mockReturnValue(false);

    const result = await reconcile(
      guild as unknown as Parameters<typeof reconcile>[0],
      db as unknown as Parameters<typeof reconcile>[1],
      categories,
      WORKSPACES_ROOT,
      MGMT_CHANNEL_ID
    );

    expect(result.archived).not.toContain(MGMT_CHANNEL_ID);
    expect(result.active).not.toContain(MGMT_CHANNEL_ID);
    expect(result.inactive).not.toContain(MGMT_CHANNEL_ID);
    expect(mgmtCh.setParent).not.toHaveBeenCalled();
  });

  // -------------------------------------------------------------------------
  // Test 7: category channels themselves are never archived
  // -------------------------------------------------------------------------
  it("7: kategorie-channels übersprungen — nicht als archiv eingestuft", async () => {
    const guild = makeGuild([]);
    const categories = makeCategories(guild);
    // categories are already in guild.channels.cache via makeCategories()

    const db = makeDb([]);
    fsMock.existsSync.mockReturnValue(false);

    const result = await reconcile(
      guild as unknown as Parameters<typeof reconcile>[0],
      db as unknown as Parameters<typeof reconcile>[1],
      categories,
      WORKSPACES_ROOT,
      MGMT_CHANNEL_ID
    );

    expect(result.archived).not.toContain(categories.active.id);
    expect(result.archived).not.toContain(categories.inactive.id);
    expect(result.archived).not.toContain(categories.archive.id);
  });

  // -------------------------------------------------------------------------
  // Test 8: empty workspacesRoot — no error, empty result
  // -------------------------------------------------------------------------
  it("8: leerer workspaces_root — kein Fehler, leeres Result", async () => {
    const guild = makeGuild([]);
    const categories = makeCategories(guild);
    const db = makeDb([]);

    fsMock.existsSync.mockReturnValue(false);

    const result = await reconcile(
      guild as unknown as Parameters<typeof reconcile>[0],
      db as unknown as Parameters<typeof reconcile>[1],
      categories,
      WORKSPACES_ROOT,
      MGMT_CHANNEL_ID
    );

    expect(result.active).toHaveLength(0);
    expect(result.inactive).toHaveLength(0);
    expect(result.archived).toHaveLength(0);
    expect(result.deletedWorkspaces).toHaveLength(0);
  });
});

// ===========================================================================
// handleChannelDelete() tests
// ===========================================================================

describe("handleChannelDelete()", () => {
  function makeConfig() {
    return {
      management_channel: "disclaw",
      workspaces_root: WORKSPACES_ROOT,
      claude_command: "claude",
      claude_timeout_seconds: 120,
      max_concurrent_agents: 4,
      env_blocklist: [] as string[],
    };
  }

  // -------------------------------------------------------------------------
  // Test 9: Agent channel deleted → DB + workspace removed
  // -------------------------------------------------------------------------
  it("9: channelDelete: Agent-Channel → DB + Workspace gelöscht", async () => {
    const agentCh = makeTextChannel("ch-del-agent", "my-agent");
    const guild = makeGuild([agentCh]);
    const categories = makeCategories(guild);
    const wsPath = path.join(WORKSPACES_ROOT, "my-agent");

    const db = makeDb([
      { id: 1, channel_id: "ch-del-agent", agent_name: "my-agent", workspace_path: wsPath },
    ]);

    fsMock.existsSync.mockReturnValue(true);

    await handleChannelDelete(agentCh as unknown as Parameters<typeof handleChannelDelete>[0], {
      db: db as unknown as Parameters<typeof handleChannelDelete>[1]["db"],
      config: makeConfig() as unknown as Parameters<typeof handleChannelDelete>[1]["config"],
      guild: guild as unknown as Parameters<typeof handleChannelDelete>[1]["guild"],
      categories,
      managementChannelId: MGMT_CHANNEL_ID,
      setManagementChannelId: vi.fn(),
      setCategories: vi.fn(),
    });

    expect(db.deleteWorkspaceByChannelId).toHaveBeenCalledWith("ch-del-agent");
    expect(fsMock.rmSync).toHaveBeenCalledWith(
      wsPath,
      expect.objectContaining({ recursive: true })
    );
  });

  // -------------------------------------------------------------------------
  // Test 10: Management channel deleted → new channel created, state updated
  // -------------------------------------------------------------------------
  it("10: channelDelete: Management-Channel → neuer Channel erstellt", async () => {
    const mgmtCh = makeTextChannel(MGMT_CHANNEL_ID, "disclaw");
    const guild = makeGuild([]);
    const categories = makeCategories(guild);

    const db = makeDb([
      { id: 99, channel_id: MGMT_CHANNEL_ID, agent_name: "disclaw", workspace_path: "__management__" },
    ]);

    const setManagementChannelId = vi.fn();

    await handleChannelDelete(mgmtCh as unknown as Parameters<typeof handleChannelDelete>[0], {
      db: db as unknown as Parameters<typeof handleChannelDelete>[1]["db"],
      config: makeConfig() as unknown as Parameters<typeof handleChannelDelete>[1]["config"],
      guild: guild as unknown as Parameters<typeof handleChannelDelete>[1]["guild"],
      categories,
      managementChannelId: MGMT_CHANNEL_ID,
      setManagementChannelId,
      setCategories: vi.fn(),
    });

    expect(guild.channels.create).toHaveBeenCalledWith(
      expect.objectContaining({ name: "disclaw" })
    );
    expect(setManagementChannelId).toHaveBeenCalled();
    expect(db.createWorkspace).toHaveBeenCalled();
  });

  // -------------------------------------------------------------------------
  // Test 11: Lifecycle category channel deleted → ensureCategories called again
  // -------------------------------------------------------------------------
  it("11: channelDelete: Kategorie-Channel → ensureCategories erneut aufgerufen", async () => {
    const guild = makeGuild([]);
    const categories = makeCategories(guild);

    // Simulate deletion of the active category channel
    const deletedCategoryChannel = makeTextChannel(categories.active.id, "🟢 Aktive Agents");

    // Add replacement category channels so ensureCategories finds them
    const newActive = makeCategoryChannel("cat-active-v2", "🟢 Aktive Agents");
    const newInactive = makeCategoryChannel("cat-inactive", "🔴 Inaktive Agents");
    const newArchive = makeCategoryChannel("cat-archive", "🗄️ Archiv");
    newActive.guild = guild;
    newInactive.guild = guild;
    newArchive.guild = guild;
    guild.channels.cache.set("cat-active-v2", newActive);
    guild.channels.cache.set("cat-inactive", newInactive);
    guild.channels.cache.set("cat-archive", newArchive);

    const db = makeDb([]);
    const setCategories = vi.fn();

    await handleChannelDelete(deletedCategoryChannel as unknown as Parameters<typeof handleChannelDelete>[0], {
      db: db as unknown as Parameters<typeof handleChannelDelete>[1]["db"],
      config: makeConfig() as unknown as Parameters<typeof handleChannelDelete>[1]["config"],
      guild: guild as unknown as Parameters<typeof handleChannelDelete>[1]["guild"],
      categories,
      managementChannelId: MGMT_CHANNEL_ID,
      setManagementChannelId: vi.fn(),
      setCategories,
    });

    expect(setCategories).toHaveBeenCalled();
  });
});

// ===========================================================================
// ensureCategories() tests
// ===========================================================================

describe("ensureCategories()", () => {
  // -------------------------------------------------------------------------
  // Test 12: All three categories missing → all three created
  // -------------------------------------------------------------------------
  it("12: ensureCategories: alle fehlen → 3 Kategorien erstellt", async () => {
    const guild = makeGuild([]);

    const result = await ensureCategories(guild as unknown as Parameters<typeof ensureCategories>[0]);

    expect(guild.channels.create).toHaveBeenCalledTimes(3);
    expect(result.active).toBeDefined();
    expect(result.inactive).toBeDefined();
    expect(result.archive).toBeDefined();
  });

  // -------------------------------------------------------------------------
  // Test 13: Some categories present → only missing ones created
  // -------------------------------------------------------------------------
  it("13: ensureCategories: teilweise vorhanden → nur fehlende erstellt", async () => {
    const existingActive = makeCategoryChannel("existing-active", "🟢 Aktive Agents");
    const existingArchive = makeCategoryChannel("existing-archive", "🗄️ Archiv");
    const guild = makeGuild([existingActive, existingArchive]);

    const result = await ensureCategories(guild as unknown as Parameters<typeof ensureCategories>[0]);

    // Only the inactive category should be created
    expect(guild.channels.create).toHaveBeenCalledTimes(1);
    expect(guild.channels.create).toHaveBeenCalledWith(
      expect.objectContaining({ name: "🔴 Inaktive Agents" })
    );

    expect(result.active.id).toBe("existing-active");
    expect(result.archive.id).toBe("existing-archive");
    expect(result.inactive).toBeDefined();
  });
});