import { describe, it, expect, vi, beforeAll, afterAll } from "vitest";
import prisma from "../config/database";
import {
  toolDefinitionsFor,
  executeTool,
  ctxCan,
  TOOL_LABELS,
  type AiAuthCtx,
} from "../services/ai-tools";

// The agentic loop talks to a true external (Anthropic API) — mock the SDK
// module; everything below it (tools, services, DB) runs for real.
const { createMock } = vi.hoisted(() => ({ createMock: vi.fn() }));
vi.mock("@anthropic-ai/sdk", () => ({
  default: class MockAnthropic {
    messages = { create: createMock };
  },
}));

// Imported AFTER the mock so ai.service's `new Anthropic()` gets the mock.
import { agenticChat } from "../services/ai.service";

const ADMIN: AiAuthCtx = {
  userId: 999999993,
  roleName: "admin",
  permissions: [],
};
const VIEWER_INVOICES: AiAuthCtx = {
  userId: 999999994,
  roleName: "viewer",
  permissions: ["invoices.view"],
};
const NOBODY: AiAuthCtx = {
  userId: 999999995,
  roleName: "viewer",
  permissions: [],
};

// People-centric fixtures (far-future dates per fixture hygiene; unique
// names/spz so re-runs can't collide with real rows). 07:00–15:30 with a
// 30min break = 8.00 worked hours; trip 2 has a stored distance (10) that
// deliberately differs from end-start (8) to pin the stats-coalesce rule.
const FIX = {
  username: "aitest.dominik",
  email: "aitest.dominik@test.local",
  first: "Dominik",
  last: "AiToolsTest",
  spz: "AITEST999",
  note: "AiTools fixture",
  role: "aitest-role",
  username2: "aitest.other",
  email2: "aitest.other@test.local",
};
let fixUserId = 0;
let fixUser2Id = 0;
let fixRoleId = 0;
let fixVehicleId = 0;

beforeAll(async () => {
  // Defensive pre-clean of a previously failed run (Restrict FK on
  // work_plan_entries.created_by means entries go before the user).
  await prisma.work_plan_entries.deleteMany({ where: { note: FIX.note } });
  await prisma.users.deleteMany({
    where: { username: { in: [FIX.username, FIX.username2] } },
  });
  await prisma.roles.deleteMany({ where: { name: FIX.role } });
  await prisma.vehicles.deleteMany({ where: { spz: FIX.spz } });
  await prisma.ai_usage.deleteMany({
    where: { user_id: { in: [ADMIN.userId, NOBODY.userId] }, kind: "agent" },
  });

  // find_employee scopes its population to role-permission holders (route
  // parity), so the fixture user needs a role carrying attendance.record +
  // trips.record (both permissions exist from migrations/seed).
  const role = await prisma.roles.create({
    data: { name: FIX.role, display_name: "AiTools test role" },
  });
  fixRoleId = role.id;
  const perms = await prisma.permissions.findMany({
    where: { name: { in: ["attendance.record", "trips.record"] } },
    select: { id: true },
  });
  if (perms.length !== 2) {
    throw new Error("Test setup: attendance.record/trips.record missing");
  }
  await prisma.role_permissions.createMany({
    data: perms.map((p) => ({ role_id: fixRoleId, permission_id: p.id })),
  });

  const u = await prisma.users.create({
    data: {
      username: FIX.username,
      email: FIX.email,
      password_hash: "x",
      first_name: FIX.first,
      last_name: FIX.last,
      is_active: true,
      role_id: fixRoleId,
    },
  });
  fixUserId = u.id;
  // Role-less second user: invisible to scoped find_employee populations,
  // off the plan grid, and the foreign-trip fixture for scoping tests.
  const u2 = await prisma.users.create({
    data: {
      username: FIX.username2,
      email: FIX.email2,
      password_hash: "x",
      first_name: "Otto",
      last_name: "AiToolsTest",
      is_active: true,
    },
  });
  fixUser2Id = u2.id;
  await prisma.attendance.create({
    data: {
      user_id: fixUserId,
      shift_date: new Date(Date.UTC(2098, 5, 15)),
      arrival_time: new Date(2098, 5, 15, 7, 0, 0),
      departure_time: new Date(2098, 5, 15, 15, 30, 0),
      break_start: new Date(2098, 5, 15, 11, 0, 0),
      break_end: new Date(2098, 5, 15, 11, 30, 0),
      leave_type: "work",
    },
  });
  const v = await prisma.vehicles.create({
    data: { spz: FIX.spz, name: "AiTest Van" },
  });
  fixVehicleId = v.id;
  await prisma.trips.createMany({
    data: [
      {
        vehicle_id: fixVehicleId,
        user_id: fixUserId,
        trip_date: new Date(Date.UTC(2098, 5, 15)),
        start_km: 1000,
        end_km: 1042,
        route_from: "Brno",
        route_to: "Praha",
        is_business: true,
      },
      {
        vehicle_id: fixVehicleId,
        user_id: fixUserId,
        trip_date: new Date(Date.UTC(2098, 5, 16)),
        start_km: 1042,
        end_km: 1050,
        distance: 10,
        route_from: "Praha",
        route_to: "Brno",
        is_business: false,
      },
      {
        // Second user's trip in the SAME window — must be excluded by the
        // non-manager self-scoping (an unscoped query would return 3 rows).
        vehicle_id: fixVehicleId,
        user_id: fixUser2Id,
        trip_date: new Date(Date.UTC(2098, 5, 15)),
        start_km: 500,
        end_km: 600,
        route_from: "Ostrava",
        route_to: "Brno",
        is_business: true,
      },
    ],
  });
  await prisma.work_plan_entries.create({
    data: {
      user_id: fixUserId,
      created_by: fixUserId,
      date_from: new Date(Date.UTC(2098, 5, 15)),
      date_to: new Date(Date.UTC(2098, 5, 16)),
      category: "aitest-cat",
      note: FIX.note,
    },
  });
});

afterAll(async () => {
  // FK-safe order: plan entries carry a Restrict FK on created_by.
  const fixUserIds = [fixUserId, fixUser2Id];
  await prisma.work_plan_entries.deleteMany({
    where: { user_id: { in: fixUserIds } },
  });
  await prisma.trips.deleteMany({ where: { user_id: { in: fixUserIds } } });
  await prisma.attendance.deleteMany({
    where: { user_id: { in: fixUserIds } },
  });
  await prisma.users.deleteMany({ where: { id: { in: fixUserIds } } });
  await prisma.roles.deleteMany({ where: { id: fixRoleId } });
  await prisma.vehicles.deleteMany({ where: { id: fixVehicleId } });
  await prisma.ai_usage.deleteMany({
    where: { user_id: { in: [ADMIN.userId, NOBODY.userId] }, kind: "agent" },
  });
});

describe("ai-tools — permission delegation", () => {
  it("ctxCan: admin bypasses, others need the exact permission", () => {
    expect(ctxCan(ADMIN, "invoices.view")).toBe(true);
    expect(ctxCan(VIEWER_INVOICES, "invoices.view")).toBe(true);
    expect(ctxCan(VIEWER_INVOICES, "orders.view")).toBe(false);
    expect(ctxCan(NOBODY, "invoices.view")).toBe(false);
  });

  it("toolDefinitionsFor filters the tool list by the user's permissions", () => {
    const adminTools = toolDefinitionsFor(ADMIN).map((t) => t.name);
    // All registered tools (the labels map is the authoritative name list).
    expect(adminTools.sort()).toEqual(Object.keys(TOOL_LABELS).sort());

    const viewerTools = toolDefinitionsFor(VIEWER_INVOICES).map((t) => t.name);
    expect(viewerTools).toContain("list_invoices");
    expect(viewerTools).toContain("get_invoice_stats");
    expect(viewerTools).not.toContain("list_orders");
    expect(viewerTools).not.toContain("get_stock_overview");

    expect(toolDefinitionsFor(NOBODY)).toHaveLength(0);
  });

  it("executeTool DENIES a tool the user lacks the permission for", async () => {
    const res = await executeTool("list_orders", {}, VIEWER_INVOICES);
    expect(res.ok).toBe(false);
    expect(JSON.stringify(res.result)).toContain("oprávnění");
  });

  it("executeTool rejects an unknown (hallucinated) tool name", async () => {
    const res = await executeTool("drop_all_tables", {}, ADMIN);
    expect(res.ok).toBe(false);
    expect(JSON.stringify(res.result)).toContain("Neznámý nástroj");
  });

  it("get_attendance_summary: another user's data needs attendance.manage", async () => {
    const self: AiAuthCtx = {
      userId: 999999996,
      roleName: "viewer",
      permissions: ["attendance.record"],
    };
    // Own data — allowed (empty month is fine, shape matters).
    const own = await executeTool("get_attendance_summary", {}, self);
    expect(own.ok).toBe(true);
    expect(own.result).toMatchObject({ user_id: self.userId });

    // Someone else's data without attendance.manage — denied in-result, and
    // executeTool flags handler-level { error } results as not-ok so denial
    // chips render consistently.
    const other = await executeTool(
      "get_attendance_summary",
      { user_id: 1 },
      self,
    );
    expect(other.ok).toBe(false);
    expect(JSON.stringify(other.result)).toContain("oprávnění");
  });
});

describe("ai-tools — employees, attendance detail, trips, work plan", () => {
  const RECORDER: AiAuthCtx = {
    userId: 999999997,
    roleName: "viewer",
    permissions: ["attendance.record"],
  };

  it("find_employee resolves a name (and full name) to user_id", async () => {
    const res = await executeTool(
      "find_employee",
      { search: FIX.last },
      RECORDER,
    );
    expect(res.ok).toBe(true);
    const r = res.result as {
      employees: {
        user_id: number;
        name: string;
        username?: string;
        active: boolean;
      }[];
    };
    const hit = r.employees.find((e) => e.user_id === fixUserId);
    // Attendance callers see usernames (GET /plan/users parity).
    expect(hit).toMatchObject({
      name: `${FIX.first} ${FIX.last}`,
      username: FIX.username,
      active: true,
    });
    // The role-less second user is OUTSIDE the attendance.record population
    // (route parity with listPlanUsers) — must not be returned.
    expect(r.employees.some((e) => e.user_id === fixUser2Id)).toBe(false);

    const full = await executeTool(
      "find_employee",
      { search: `${FIX.first} ${FIX.last}` },
      RECORDER,
    );
    expect(
      (full.result as { employees: { user_id: number }[] }).employees.some(
        (e) => e.user_id === fixUserId,
      ),
    ).toBe(true);
  });

  it("find_employee: trips callers get no usernames; trips.history alone is denied", async () => {
    // GET /trips/users parity: drivers' picker has no usernames.
    const trips = await executeTool(
      "find_employee",
      { search: FIX.last },
      { userId: 999999998, roleName: "viewer", permissions: ["trips.record"] },
    );
    expect(trips.ok).toBe(true);
    const t = trips.result as {
      employees: { user_id: number; username?: string }[];
    };
    const hit = t.employees.find((e) => e.user_id === fixUserId);
    expect(hit).toBeDefined();
    expect(hit).not.toHaveProperty("username");

    // trips.history grants no picker route → no find_employee either.
    const hist = await executeTool(
      "find_employee",
      { search: FIX.last },
      { userId: 999999998, roleName: "viewer", permissions: ["trips.history"] },
    );
    expect(hist.ok).toBe(false);
  });

  it("find_employee is denied without any people-related permission", async () => {
    const res = await executeTool("find_employee", { search: "x" }, NOBODY);
    expect(res.ok).toBe(false);
    expect(toolDefinitionsFor(NOBODY).map((t) => t.name)).not.toContain(
      "find_employee",
    );
  });

  it("find_employee: only users.view sees the full directory (role-less users)", async () => {
    // ADMIN bypasses ctxCan → full-directory branch finds the role-less user.
    const admin = await executeTool("find_employee", { search: "Otto" }, ADMIN);
    expect(
      (admin.result as { employees: { user_id: number }[] }).employees.some(
        (e) => e.user_id === fixUser2Id,
      ),
    ).toBe(true);
  });

  it("get_attendance_summary returns day detail with worked hours for a date range", async () => {
    const res = await executeTool(
      "get_attendance_summary",
      { user_id: fixUserId, date_from: "2098-06-15", date_to: "2098-06-15" },
      ADMIN,
    );
    expect(res.ok).toBe(true);
    const r = res.result as {
      days: {
        date: string;
        arrival: string | null;
        departure: string | null;
        worked_hours: number | null;
      }[];
      worked_hours_total: number;
      days_by_type: Record<string, number>;
    };
    expect(r.days).toHaveLength(1);
    expect(r.days[0]).toMatchObject({
      date: "2098-06-15",
      arrival: "07:00",
      departure: "15:30",
      worked_hours: 8, // 8.5 h minus 30 min break
    });
    expect(r.worked_hours_total).toBe(8);
    expect(r.days_by_type).toEqual({ work: 1 });
  });

  it("list_trips: manager filter + km totals with the stats coalesce; non-managers scoped to self", async () => {
    const mgr = await executeTool(
      "list_trips",
      { user_id: fixUserId, date_from: "2098-06-15", date_to: "2098-06-16" },
      ADMIN,
    );
    expect(mgr.ok).toBe(true);
    const m = mgr.result as {
      total_matching: number;
      total_km: number;
      business_km: number;
      private_km: number;
      trips: { km: number; date: string }[];
    };
    expect(m.total_matching).toBe(2);
    expect(m.business_km).toBe(42);
    expect(m.private_km).toBe(10); // stored distance wins over end-start (8)
    expect(m.total_km).toBe(52);
    expect(m.trips[0].date).toBe("2098-06-16"); // newest first

    // Non-manager asking for someone else's trips → denied.
    const denied = await executeTool(
      "list_trips",
      { user_id: fixUserId },
      { userId: 999999998, roleName: "viewer", permissions: ["trips.record"] },
    );
    expect(denied.ok).toBe(false);
    expect(JSON.stringify(denied.result)).toContain("oprávnění");

    // Non-manager without user_id is hard-scoped to their own trips: the
    // second user's trip sits in the same window, so an unscoped query
    // would return 3 — the scoping must yield exactly the caller's 2.
    const own = await executeTool(
      "list_trips",
      { date_from: "2098-06-15", date_to: "2098-06-16" },
      { userId: fixUserId, roleName: "viewer", permissions: ["trips.history"] },
    );
    expect(own.ok).toBe(true);
    const o = own.result as { total_matching: number; total_km: number };
    expect(o.total_matching).toBe(2);
    expect(o.total_km).toBe(52); // foreign 100km trip excluded from totals too
  });

  it("get_work_plan resolves the range-entry into per-day rows", async () => {
    const res = await executeTool(
      "get_work_plan",
      { user_id: fixUserId, date_from: "2098-06-15", date_to: "2098-06-17" },
      RECORDER,
    );
    expect(res.ok).toBe(true);
    const r = res.result as {
      plan: { date: string; user: string; plan: string; note: string }[];
      records: number;
    };
    // The entry spans 15.–16. → exactly two resolved days, none on the 17th.
    expect(r.records).toBe(2);
    expect(r.plan[0]).toMatchObject({
      date: "2098-06-15",
      user: `${FIX.first} ${FIX.last}`,
      plan: "aitest-cat", // no plan_categories row → raw key fallback
      note: FIX.note,
    });
    expect(r.plan[1].date).toBe("2098-06-16");
  });

  it("get_work_plan: off-grid users need attendance.manage (grid-route parity)", async () => {
    // The role-less second user is not a plan-grid user → a bare
    // attendance.record caller is denied...
    const denied = await executeTool(
      "get_work_plan",
      { user_id: fixUser2Id, date_from: "2098-06-15", date_to: "2098-06-16" },
      RECORDER,
    );
    expect(denied.ok).toBe(false);
    expect(JSON.stringify(denied.result)).toContain("oprávnění");

    // ...while a manager/admin may read them (empty plan, no error).
    const admin = await executeTool(
      "get_work_plan",
      { user_id: fixUser2Id, date_from: "2098-06-15", date_to: "2098-06-16" },
      ADMIN,
    );
    expect(admin.ok).toBe(true);
    expect((admin.result as { records: number }).records).toBe(0);
  });
});

describe("ai-tools — real reads", () => {
  it("list_invoices returns the compact shape from the real DB", async () => {
    const res = await executeTool("list_invoices", {}, ADMIN);
    expect(res.ok).toBe(true);
    const r = res.result as {
      total_matching: number;
      shown: number;
      invoices: unknown[];
    };
    expect(typeof r.total_matching).toBe("number");
    expect(Array.isArray(r.invoices)).toBe(true);
    expect(r.shown).toBe(r.invoices.length);
    expect(r.shown).toBeLessThanOrEqual(20);
  });

  it("list_projects + get_stock_overview return their shapes", async () => {
    const projects = await executeTool("list_projects", {}, ADMIN);
    expect(projects.ok).toBe(true);
    expect(
      Array.isArray((projects.result as { projects: unknown[] }).projects),
    ).toBe(true);

    const stock = await executeTool("get_stock_overview", {}, ADMIN);
    expect(stock.ok).toBe(true);
    expect(
      typeof (stock.result as { below_minimum_count: number })
        .below_minimum_count,
    ).toBe("number");
  });
});

describe("agenticChat loop (SDK mocked)", () => {
  it("executes a requested tool, feeds the result back, returns final text + trace", async () => {
    createMock.mockReset();
    createMock
      .mockResolvedValueOnce({
        stop_reason: "tool_use",
        content: [
          { type: "text", text: "Podívám se." },
          {
            type: "tool_use",
            id: "toolu_1",
            name: "list_projects",
            input: {},
          },
        ],
        usage: { input_tokens: 100, output_tokens: 20 },
      })
      .mockResolvedValueOnce({
        stop_reason: "end_turn",
        content: [{ type: "text", text: "Máte 2 projekty." }],
        usage: { input_tokens: 200, output_tokens: 30 },
      });

    const res = await agenticChat(
      [{ role: "user", content: "Projekty?" }],
      ADMIN,
    );
    expect(res.reply).toBe("Máte 2 projekty.");
    expect(res.toolTrace).toEqual([
      { name: "list_projects", label: "Projekty", ok: true },
    ]);
    expect(createMock).toHaveBeenCalledTimes(2);

    // Second call must carry the tool_result back to the model.
    const secondCall = createMock.mock.calls[1][0];
    const lastMsg = secondCall.messages[secondCall.messages.length - 1];
    expect(lastMsg.role).toBe("user");
    expect(lastMsg.content[0]).toMatchObject({
      type: "tool_result",
      tool_use_id: "toolu_1",
    });

    // Usage was recorded per round-trip.
    const usageRows = await prisma.ai_usage.findMany({
      where: { user_id: ADMIN.userId, kind: "agent" },
    });
    expect(usageRows.length).toBe(2);
  });

  it("dedupes the tool trace: failed attempt + successful retry = one ok chip", async () => {
    const self: AiAuthCtx = {
      userId: 999999996,
      roleName: "viewer",
      permissions: ["attendance.record"],
    };
    createMock.mockReset();
    createMock
      .mockResolvedValueOnce({
        stop_reason: "tool_use",
        content: [
          {
            type: "tool_use",
            id: "toolu_a",
            name: "get_attendance_summary",
            input: { user_id: 1 }, // denied: someone else without manage
          },
        ],
        usage: { input_tokens: 10, output_tokens: 5 },
      })
      .mockResolvedValueOnce({
        stop_reason: "tool_use",
        content: [
          {
            type: "tool_use",
            id: "toolu_b",
            name: "get_attendance_summary",
            input: {}, // retry: own data, succeeds
          },
        ],
        usage: { input_tokens: 10, output_tokens: 5 },
      })
      .mockResolvedValueOnce({
        stop_reason: "end_turn",
        content: [{ type: "text", text: "Hotovo." }],
        usage: { input_tokens: 10, output_tokens: 5 },
      });
    const res = await agenticChat(
      [{ role: "user", content: "Moje docházka?" }],
      self,
    );
    expect(res.toolTrace).toEqual([
      { name: "get_attendance_summary", label: "Docházka", ok: true },
    ]);
    await prisma.ai_usage.deleteMany({
      where: { user_id: self.userId, kind: "agent" },
    });
  });

  it("injects the caller's identity into the system prompt", async () => {
    createMock.mockReset();
    createMock.mockResolvedValueOnce({
      stop_reason: "end_turn",
      content: [{ type: "text", text: "Ahoj." }],
      usage: { input_tokens: 10, output_tokens: 5 },
    });
    await agenticChat([{ role: "user", content: "Kdo jsem?" }], {
      userId: fixUserId,
      roleName: "viewer",
      permissions: ["attendance.record"],
    });
    const system: string = createMock.mock.calls[0][0].system;
    expect(system).toContain(`${FIX.first} ${FIX.last}`);
    expect(system).toContain(`user_id ${fixUserId}`);
    // Cleanup the usage row this extra fixture-user turn recorded.
    await prisma.ai_usage.deleteMany({
      where: { user_id: fixUserId, kind: "agent" },
    });
  });

  it("a user without permissions gets NO tools passed to the model", async () => {
    createMock.mockReset();
    createMock.mockResolvedValueOnce({
      stop_reason: "end_turn",
      content: [{ type: "text", text: "Ahoj." }],
      usage: { input_tokens: 10, output_tokens: 5 },
    });
    await agenticChat([{ role: "user", content: "Ahoj" }], NOBODY);
    expect(createMock.mock.calls[0][0].tools).toBeUndefined();
  });

  it("stops at the iteration cap with an explanatory note", async () => {
    createMock.mockReset();
    createMock.mockResolvedValue({
      stop_reason: "tool_use",
      content: [
        { type: "tool_use", id: "toolu_x", name: "list_projects", input: {} },
      ],
      usage: { input_tokens: 10, output_tokens: 5 },
    });
    const res = await agenticChat([{ role: "user", content: "smyčka" }], ADMIN);
    expect(createMock.mock.calls.length).toBe(6); // MAX_AGENT_ITERATIONS
    expect(res.reply).toContain("příliš složitý");
  });
});