const Fastify = require("fastify");

const featureFlagsRoutes = require("../../../src/routes/featureFlags");
const { AppError } = require("../../../src/utils/AppError");

const ACTOR_ID = "aaaaaaaa-aaaa-4aaa-8aaa-aaaaaaaaaaaa";

function buildFlagRecord(flagKey, overrides = {}) {
  return {
    id:
      flagKey === "payment_batch_v1"
        ? "11111111-1111-4111-8111-111111111111"
        : "22222222-2222-4222-8222-222222222222",
    flag_key: flagKey,
    override_mode: "force_off",
    rollout_type: "global",
    department_ids: [],
    note: "before batch",
    version: flagKey === "payment_batch_v1" ? 2 : 4,
    created_at: new Date("2026-04-07T08:00:00.000Z"),
    created_by: null,
    updated_at: new Date("2026-04-07T08:00:00.000Z"),
    updated_by: null,
    ...overrides,
  };
}

function cloneRecord(record) {
  return {
    ...record,
    department_ids: Array.isArray(record.department_ids) ? [...record.department_ids] : record.department_ids,
    created_at: new Date(record.created_at),
    updated_at: new Date(record.updated_at),
  };
}

async function buildApp(options = {}) {
  const app = Fastify();
  const actor = options.actor ?? {
    id: ACTOR_ID,
    permissionCodes: ["system.settings"],
  };
  const state = {
    flags:
      options.flags?.map((item) => cloneRecord(item)) ?? [
        buildFlagRecord("payment_batch_v1"),
        buildFlagRecord("cutover_console_v1"),
      ],
    auditLogs: [],
  };

  const topLevelFindUnique = vi.fn(async ({ where }) => {
    if (where?.flag_key) {
      return state.flags.find((item) => item.flag_key === where.flag_key) ?? null;
    }
    return null;
  });

  const prisma = {
    auditLog: {
      findMany: vi.fn(),
      count: vi.fn(),
      create: vi.fn(),
    },
    featureFlag: {
      findUnique: topLevelFindUnique,
    },
    $transaction: vi.fn(async (callback) => {
      const txState = {
        flags: state.flags.map((item) => cloneRecord(item)),
        auditLogs: state.auditLogs.map((item) => ({ ...item })),
      };
      const tx = {
        featureFlag: {
          findUnique: vi.fn(async ({ where }) => {
            if (where?.flag_key) {
              return txState.flags.find((item) => item.flag_key === where.flag_key) ?? null;
            }
            return null;
          }),
          updateMany: vi.fn(async ({ where, data }) => {
            const target = txState.flags.find(
              (item) => item.id === where.id && item.version === where.version,
            );
            if (!target) {
              return { count: 0 };
            }

            target.override_mode = data.override_mode;
            target.rollout_type = data.rollout_type;
            target.department_ids = Array.isArray(data.department_ids)
              ? [...data.department_ids]
              : data.department_ids;
            target.note = data.note;
            target.version += Number(data.version?.increment ?? 0);
            target.updated_by = data.updated_by;
            target.updated_at = new Date("2026-04-07T09:00:00.000Z");

            return { count: 1 };
          }),
        },
        auditLog: {
          create: vi.fn(async ({ data }) => {
            txState.auditLogs.push(data);
            return { id: `audit-${txState.auditLogs.length}` };
          }),
        },
      };

      try {
        const result = await callback(tx);
        state.flags = txState.flags;
        state.auditLogs = txState.auditLogs;
        return result;
      } catch (error) {
        throw error;
      }
    }),
  };

  app.decorate("authenticate", async (request) => {
    request.employee = actor;
  });
  app.decorate("requirePermission", (permissionCode) => async (request) => {
    request.employee = actor;
    const permissionCodes = actor.permissionCodes ?? [];
    if (!permissionCodes.includes("*") && !permissionCodes.includes(permissionCode)) {
      throw new AppError({ code: "PERM_001", message: "无权限", statusCode: 403 });
    }
  });
  app.decorate("config", {});
  app.decorate("prisma", prisma);
  app.setErrorHandler((error, request, reply) => {
    reply.status(error.statusCode || 500).send({
      requestId: request.id,
      error: {
        code: error.code || "SYS_001",
        message: error.message,
        details: error.details ?? null,
      },
    });
  });

  await app.register(featureFlagsRoutes, { prefix: "/api" });
  return { app, state, prisma };
}

describe("feature flag batch route", () => {
  it("updates multiple flags in one transaction and writes one audit per flag", async () => {
    const { app, state, prisma } = await buildApp();

    const response = await app.inject({
      method: "POST",
      url: "/api/system/feature-flags/batch",
      payload: {
        items: [
          {
            flagKey: "payment_batch_v1",
            overrideMode: "force_on",
            expectedVersion: 2,
          },
          {
            flagKey: "cutover_console_v1",
            overrideMode: "inherit",
            expectedVersion: 4,
          },
        ],
        note: "R54 批量切换",
      },
    });

    expect(response.statusCode).toBe(200);
    expect(response.json().data.count).toBe(2);
    expect(prisma.$transaction).toHaveBeenCalledTimes(1);

    expect(state.flags).toEqual(
      expect.arrayContaining([
        expect.objectContaining({
          flag_key: "payment_batch_v1",
          override_mode: "force_on",
          note: "R54 批量切换",
          version: 3,
          updated_by: ACTOR_ID,
        }),
        expect.objectContaining({
          flag_key: "cutover_console_v1",
          override_mode: "inherit",
          note: "R54 批量切换",
          version: 5,
          updated_by: ACTOR_ID,
        }),
      ]),
    );
    expect(state.auditLogs).toHaveLength(2);
    expect(state.auditLogs[0]).toMatchObject({
      action: "FEATURE_FLAG_UPDATED",
      target_type: "feature_flag",
      actor_id: ACTOR_ID,
      extra: expect.objectContaining({
        flagKey: "payment_batch_v1",
      }),
    });
    expect(state.auditLogs[1]).toMatchObject({
      action: "FEATURE_FLAG_UPDATED",
      extra: expect.objectContaining({
        flagKey: "cutover_console_v1",
      }),
    });

    await app.close();
  });

  it("rolls back the whole batch when any flag hits a version conflict", async () => {
    const { app, state } = await buildApp();
    const beforeFlags = state.flags.map((item) => ({
      flag_key: item.flag_key,
      override_mode: item.override_mode,
      note: item.note,
      version: item.version,
    }));

    const response = await app.inject({
      method: "POST",
      url: "/api/system/feature-flags/batch",
      payload: {
        items: [
          {
            flagKey: "payment_batch_v1",
            overrideMode: "force_on",
            expectedVersion: 2,
          },
          {
            flagKey: "cutover_console_v1",
            overrideMode: "force_on",
            expectedVersion: 99,
          },
        ],
        note: "should rollback",
      },
    });

    expect(response.statusCode).toBe(409);
    expect(response.json().error.details).toMatchObject({
      featureFlag: "version_conflict",
      flagKey: "cutover_console_v1",
      expectedVersion: 99,
      currentVersion: 4,
    });
    expect(
      state.flags.map((item) => ({
        flag_key: item.flag_key,
        override_mode: item.override_mode,
        note: item.note,
        version: item.version,
      })),
    ).toEqual(beforeFlags);
    expect(state.auditLogs).toEqual([]);

    await app.close();
  });

  it("rejects batch updates without system.settings permission", async () => {
    const { app, state } = await buildApp({
      actor: {
        id: ACTOR_ID,
        permissionCodes: [],
      },
    });

    const response = await app.inject({
      method: "POST",
      url: "/api/system/feature-flags/batch",
      payload: {
        items: [
          {
            flagKey: "payment_batch_v1",
            overrideMode: "force_on",
            expectedVersion: 2,
          },
        ],
        note: "should fail",
      },
    });

    expect(response.statusCode).toBe(403);
    expect(state.auditLogs).toEqual([]);

    await app.close();
  });
});