import { test, expect, type Page } from "@playwright/test";

/**
 * Inject mock data into the Zustand focus store via the browser console.
 *
 * Since we run against the Vite dev server (no Tauri runtime),
 * we seed stores directly to test the real React rendering pipeline.
 */
async function seedFocusStore(page: Page): Promise<void> {
  await page.evaluate(() => {
    // Access Zustand stores via their internal getState/setState
    // The stores are module-scoped singletons, accessible from window.__ZUSTAND_STORES__
    // We expose them in development via a small shim in main.tsx
    const w = window as Record<string, unknown>;
    const focusStore = w.__MC_FOCUS_STORE__ as {
      setState: (state: Record<string, unknown>) => void;
    };
    if (focusStore) {
      focusStore.setState({
        current: {
          id: "mr_review:platform/core:847",
          title: "Fix authentication token refresh logic",
          type: "mr_review",
          project: "platform/core",
          url: "https://gitlab.com/platform/core/-/merge_requests/847",
          iid: 847,
          updatedAt: new Date().toISOString(),
          contextQuote: "The refresh token logic has a race condition",
          requestedBy: "johndoe",
        },
        queue: [
          {
            id: "issue:platform/core:42",
            title: "Users unable to login after password reset",
            type: "issue",
            project: "platform/core",
            url: "https://gitlab.com/platform/core/-/issues/42",
            iid: 42,
            updatedAt: new Date(
              Date.now() - 5 * 24 * 60 * 60 * 1000
            ).toISOString(),
            contextQuote: null,
            requestedBy: null,
          },
          {
            id: "mr_review:platform/api:101",
            title: "Add rate limiting to public endpoints",
            type: "mr_review",
            project: "platform/api",
            url: "https://gitlab.com/platform/api/-/merge_requests/101",
            iid: 101,
            updatedAt: new Date(
              Date.now() - 10 * 24 * 60 * 60 * 1000
            ).toISOString(),
            contextQuote: null,
            requestedBy: "alice",
          },
        ],
        isLoading: false,
        error: null,
      });
    }
  });
}

/**
 * Expose Zustand stores on the window object for E2E test seeding.
 * This is done by evaluating a script that patches the store modules.
 */
async function exposeStores(page: Page): Promise<void> {
  await page.evaluate(() => {
    // The stores are ES module singletons. We need to wait for them
    // to be available. In dev mode, Vite's HMR keeps them accessible.
    // We use a polling approach to find them.
    return new Promise<void>((resolve) => {
      const check = (): void => {
        const w = window as Record<string, unknown>;
        if (w.__MC_FOCUS_STORE__) {
          resolve();
        } else {
          setTimeout(check, 50);
        }
      };
      check();
    });
  });
}

test.describe("Mission Control E2E", () => {
  test.beforeEach(async ({ page }) => {
    await page.goto("/");
    // Wait for React to mount
    await page.waitForSelector("nav");
  });

  test.describe("Focus View", () => {
    test("shows empty state when no items", async ({ page }) => {
      await expect(page.getByText("All Clear")).toBeVisible();
      await expect(
        page.getByText("Nothing needs your attention right now")
      ).toBeVisible();
    });

    test("shows navigation tabs", async ({ page }) => {
      await expect(page.getByRole("button", { name: "Focus" })).toBeVisible();
      await expect(page.getByRole("button", { name: "Queue" })).toBeVisible();
      await expect(page.getByRole("button", { name: "Inbox" })).toBeVisible();
    });

    test("shows focus item when store has data", async ({ page }) => {
      try {
        await exposeStores(page);
        await seedFocusStore(page);
      } catch {
        // Stores not exposed -- skip this test in environments without the shim
        test.skip();
        return;
      }

      await expect(
        page.getByText("Fix authentication token refresh logic")
      ).toBeVisible();
      await expect(page.getByText("MR REVIEW")).toBeVisible();
      await expect(page.getByText("!847 in platform/core")).toBeVisible();
    });

    test("shows action buttons when item is focused", async ({ page }) => {
      try {
        await exposeStores(page);
        await seedFocusStore(page);
      } catch {
        test.skip();
        return;
      }

      await expect(page.getByText("Start")).toBeVisible();
      await expect(page.getByText("1 hour")).toBeVisible();
      await expect(page.getByText("Tomorrow")).toBeVisible();
      await expect(page.getByText("Skip")).toBeVisible();
    });
  });

  test.describe("Navigation", () => {
    test("switches between Focus and Queue views", async ({ page }) => {
      // Start in Focus view
      await expect(page.getByText("All Clear")).toBeVisible();

      // Click Queue tab
      await page.getByRole("button", { name: "Queue" }).click();
      await expect(page.getByText("No items in the queue")).toBeVisible();

      // Click Focus tab
      await page.getByRole("button", { name: "Focus" }).click();
      await expect(page.getByText("All Clear")).toBeVisible();
    });

    test("shows Inbox placeholder", async ({ page }) => {
      await page.getByRole("button", { name: "Inbox" }).click();
      await expect(page.getByText("Inbox view coming in Phase 4b")).toBeVisible();
    });

    test("Queue tab shows item count badge when store has data", async ({
      page,
    }) => {
      try {
        await exposeStores(page);
        await seedFocusStore(page);
      } catch {
        test.skip();
        return;
      }

      // 1 current + 2 queue = 3
      await expect(page.getByText("3")).toBeVisible();
    });
  });

  test.describe("Queue View", () => {
    test("shows items grouped by type when store has data", async ({
      page,
    }) => {
      try {
        await exposeStores(page);
        await seedFocusStore(page);
      } catch {
        test.skip();
        return;
      }

      await page.getByRole("button", { name: "Queue" }).click();

      // Should have a Reviews section with 2 items
      await expect(page.getByText("REVIEWS (2)")).toBeVisible();
      // Should have an Issues section with 1 item
      await expect(page.getByText("ISSUES (1)")).toBeVisible();
    });

    test("clicking item switches to Focus view", async ({ page }) => {
      try {
        await exposeStores(page);
        await seedFocusStore(page);
      } catch {
        test.skip();
        return;
      }

      await page.getByRole("button", { name: "Queue" }).click();

      // Click the issue item
      await page
        .getByText("Users unable to login after password reset")
        .click();

      // Should switch to focus view -- wait for the Queue header to disappear
      await expect(page.getByText("ISSUES (1)")).not.toBeVisible();

      // The clicked item should now be THE ONE THING
      await expect(
        page.getByRole("heading", {
          name: "Users unable to login after password reset",
        })
      ).toBeVisible();
    });
  });

  test.describe("Dark mode", () => {
    test("page has dark background", async ({ page }) => {
      const body = page.locator("body");
      await expect(body).toHaveClass(/bg-surface/);
    });

    test("HTML element has dark class", async ({ page }) => {
      const html = page.locator("html");
      await expect(html).toHaveClass(/dark/);
    });
  });
});