/**
 * Tests for settings-store.
 *
 * Verifies:
 * 1. Default values are set correctly
 * 2. hydrate() loads settings from Tauri backend
 * 3. hydrate() handles missing/null state gracefully
 * 4. hydrate() handles backend errors gracefully
 * 5. hydrate() validates types before applying
 * 6. update() persists changes to backend and updates store
 * 7. update() merges with existing state file data
 * 8. update() handles write errors gracefully (no partial state)
 * 9. extractSettings excludes methods from persisted data
 */

import { describe, it, expect, vi, beforeEach } from "vitest";
import { act } from "@testing-library/react";

// Mock Tauri bindings (readState/writeState are re-exports from bindings)
const mockReadState = vi.fn();
const mockWriteState = vi.fn();

vi.mock("@/lib/tauri", () => ({
  readState: (...args: unknown[]) => mockReadState(...args),
  writeState: (...args: unknown[]) => mockWriteState(...args),
}));

// Import after mocking
import { useSettingsStore } from "@/stores/settings-store";

describe("useSettingsStore", () => {
  beforeEach(() => {
    vi.clearAllMocks();
    // Reset store to defaults
    useSettingsStore.setState({
      syncInterval: 15,
      notificationsEnabled: true,
      quickCaptureShortcut: "CommandOrControl+Shift+C",
    });
  });

  describe("defaults", () => {
    it("has correct default values", () => {
      const state = useSettingsStore.getState();
      expect(state.syncInterval).toBe(15);
      expect(state.notificationsEnabled).toBe(true);
      expect(state.quickCaptureShortcut).toBe("CommandOrControl+Shift+C");
    });
  });

  describe("hydrate", () => {
    it("loads settings from Tauri backend", async () => {
      mockReadState.mockResolvedValue({
        status: "ok",
        data: {
          settings: {
            syncInterval: 30,
            notificationsEnabled: false,
            quickCaptureShortcut: "Meta+Shift+X",
          },
        },
      });

      await act(async () => {
        await useSettingsStore.getState().hydrate();
      });

      const state = useSettingsStore.getState();
      expect(state.syncInterval).toBe(30);
      expect(state.notificationsEnabled).toBe(false);
      expect(state.quickCaptureShortcut).toBe("Meta+Shift+X");
    });

    it("keeps defaults when state is null (first run)", async () => {
      mockReadState.mockResolvedValue({
        status: "ok",
        data: null,
      });

      await act(async () => {
        await useSettingsStore.getState().hydrate();
      });

      const state = useSettingsStore.getState();
      expect(state.syncInterval).toBe(15);
      expect(state.notificationsEnabled).toBe(true);
    });

    it("keeps defaults when state has no settings key", async () => {
      mockReadState.mockResolvedValue({
        status: "ok",
        data: { otherStoreData: "value" },
      });

      await act(async () => {
        await useSettingsStore.getState().hydrate();
      });

      const state = useSettingsStore.getState();
      expect(state.syncInterval).toBe(15);
    });

    it("handles backend read errors gracefully", async () => {
      mockReadState.mockResolvedValue({
        status: "error",
        error: { code: "IO_ERROR", message: "File not found", recoverable: true },
      });

      await act(async () => {
        await useSettingsStore.getState().hydrate();
      });

      // Should keep defaults, not crash
      const state = useSettingsStore.getState();
      expect(state.syncInterval).toBe(15);
    });

    it("validates syncInterval before applying", async () => {
      mockReadState.mockResolvedValue({
        status: "ok",
        data: {
          settings: {
            syncInterval: 42, // Invalid - not 5, 15, or 30
            notificationsEnabled: false,
          },
        },
      });

      await act(async () => {
        await useSettingsStore.getState().hydrate();
      });

      const state = useSettingsStore.getState();
      // Invalid syncInterval should be ignored, keep default
      expect(state.syncInterval).toBe(15);
      // Valid field should still be applied
      expect(state.notificationsEnabled).toBe(false);
    });

    it("ignores non-boolean notificationsEnabled", async () => {
      mockReadState.mockResolvedValue({
        status: "ok",
        data: {
          settings: {
            notificationsEnabled: "yes", // Wrong type
          },
        },
      });

      await act(async () => {
        await useSettingsStore.getState().hydrate();
      });

      expect(useSettingsStore.getState().notificationsEnabled).toBe(true);
    });

    it("ignores non-string quickCaptureShortcut", async () => {
      mockReadState.mockResolvedValue({
        status: "ok",
        data: {
          settings: {
            quickCaptureShortcut: 123, // Wrong type
          },
        },
      });

      await act(async () => {
        await useSettingsStore.getState().hydrate();
      });

      expect(useSettingsStore.getState().quickCaptureShortcut).toBe(
        "CommandOrControl+Shift+C"
      );
    });
  });

  describe("update", () => {
    it("persists changes to backend and updates store", async () => {
      // Existing state in backend
      mockReadState.mockResolvedValue({
        status: "ok",
        data: { otherData: "preserved" },
      });
      mockWriteState.mockResolvedValue({ status: "ok", data: null });

      await act(async () => {
        await useSettingsStore.getState().update({ syncInterval: 5 });
      });

      // Store should be updated
      expect(useSettingsStore.getState().syncInterval).toBe(5);

      // Backend should receive merged state
      expect(mockWriteState).toHaveBeenCalledWith({
        otherData: "preserved",
        settings: {
          syncInterval: 5,
          notificationsEnabled: true,
          quickCaptureShortcut: "CommandOrControl+Shift+C",
        },
      });
    });

    it("merges with existing backend state", async () => {
      mockReadState.mockResolvedValue({
        status: "ok",
        data: {
          "mc-focus-store": { current: null, queue: [] },
          settings: { syncInterval: 30 },
        },
      });
      mockWriteState.mockResolvedValue({ status: "ok", data: null });

      await act(async () => {
        await useSettingsStore.getState().update({ notificationsEnabled: false });
      });

      // Should preserve other keys in state file
      expect(mockWriteState).toHaveBeenCalledWith(
        expect.objectContaining({
          "mc-focus-store": { current: null, queue: [] },
        })
      );
    });

    it("does not update store on write failure", async () => {
      mockReadState.mockResolvedValue({ status: "ok", data: {} });
      mockWriteState.mockResolvedValue({
        status: "error",
        error: { code: "IO_ERROR", message: "Disk full", recoverable: false },
      });

      await act(async () => {
        await useSettingsStore.getState().update({ syncInterval: 30 });
      });

      // Store should NOT be updated since write failed
      expect(useSettingsStore.getState().syncInterval).toBe(15);
    });

    it("handles null existing state on update", async () => {
      mockReadState.mockResolvedValue({ status: "ok", data: null });
      mockWriteState.mockResolvedValue({ status: "ok", data: null });

      await act(async () => {
        await useSettingsStore.getState().update({
          quickCaptureShortcut: "Meta+K",
        });
      });

      expect(useSettingsStore.getState().quickCaptureShortcut).toBe("Meta+K");
      expect(mockWriteState).toHaveBeenCalledWith({
        settings: {
          syncInterval: 15,
          notificationsEnabled: true,
          quickCaptureShortcut: "Meta+K",
        },
      });
    });

    it("persisted data does not include methods", async () => {
      mockReadState.mockResolvedValue({ status: "ok", data: {} });
      mockWriteState.mockResolvedValue({ status: "ok", data: null });

      await act(async () => {
        await useSettingsStore.getState().update({ syncInterval: 5 });
      });

      const writtenState = mockWriteState.mock.calls[0][0] as Record<string, unknown>;
      const writtenSettings = writtenState.settings as Record<string, unknown>;

      expect(writtenSettings).not.toHaveProperty("hydrate");
      expect(writtenSettings).not.toHaveProperty("update");
      expect(Object.keys(writtenSettings)).toEqual([
        "syncInterval",
        "notificationsEnabled",
        "quickCaptureShortcut",
      ]);
    });
  });
});