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

const SCREENSHOT_DIR = path.join(__dirname, "screenshots");
let screenshotIndex = 0;

async function snap(page: Page, name: string) {
  screenshotIndex++;
  const filename = `${String(screenshotIndex).padStart(2, "0")}-${name}.png`;
  await page.screenshot({ path: path.join(SCREENSHOT_DIR, filename) });
}

async function login(page: Page) {
  await page.goto("/login");
  await page.waitForTimeout(2000);
  await page.fill('input[placeholder*="username" i]', "admin");
  await page.fill('input[placeholder*="password" i]', "admin");
  await page.click('button:has-text("Login")');
  await page.waitForURL("**/", { timeout: 10000 }).catch(() => {});
  await page.waitForTimeout(2000);
}

async function createNewDocument(page: Page) {
  const newDocBtn = page.getByText("New Document");
  if (await newDocBtn.isVisible().catch(() => false)) {
    await newDocBtn.click();
    await page.waitForTimeout(500);
    await page.locator('button:has-text("Create")').click();
    await page.waitForTimeout(2000);
  }
}

async function getCanvasBox(page: Page) {
  const canvas = page.locator("canvas").first();
  const box = await canvas.boundingBox();
  if (!box) throw new Error("Canvas not found");
  return box;
}

test.describe("Image Editor - Full GUI Test Suite", () => {
  test.beforeEach(async ({ page }) => {
    screenshotIndex = 0;
    await login(page);
  });

  test("01 - Navigation & Layout", async ({ page }) => {
    // Check sidebar has Editor item
    await page.goto("/");
    await page.waitForTimeout(2000);
    const editorLink = page.locator('a:has-text("Editor")');
    await expect(editorLink).toBeVisible();
    await snap(page, "sidebar-with-editor");

    // Navigate to editor
    await editorLink.click();
    await page.waitForTimeout(2000);
    await expect(page).toHaveURL(/\/editor/);
    await snap(page, "editor-welcome-screen");

    // Verify four-zone layout elements
    const toolbar = page.locator('[data-tool="move"]');
    await expect(toolbar).toBeVisible();

    const layersTab = page.locator('[data-testid="tab-layers"]');
    await expect(layersTab).toBeVisible();

    const adjustmentsTab = page.locator('[data-testid="tab-adjustments"]');
    await expect(adjustmentsTab).toBeVisible();

    const historyTab = page.locator('[data-testid="tab-history"]');
    await expect(historyTab).toBeVisible();
  });

  test("02 - Welcome Screen & New Document", async ({ page }) => {
    await page.goto("/editor");
    await page.waitForTimeout(2000);

    // Welcome screen visible (the visible <h2>; an sr-only <h1> shares the text)
    await expect(page.getByRole("heading", { level: 2, name: "Image Editor" })).toBeVisible();
    await expect(page.getByText("Open Image")).toBeVisible();
    await expect(page.getByText("New Document")).toBeVisible();
    await snap(page, "welcome-screen");

    // Open new document dialog
    await page.getByText("New Document").click();
    await page.waitForTimeout(500);
    await expect(page.getByText("Preset")).toBeVisible();
    await snap(page, "new-doc-dialog");

    // Change preset to Instagram
    await page.locator("select").first().selectOption("1080x1080 (Instagram)");
    await page.waitForTimeout(300);
    await snap(page, "new-doc-instagram-preset");

    // Select transparent background
    await page.getByText("Transparent").click();
    await page.waitForTimeout(300);
    await snap(page, "new-doc-transparent");

    // Create the document
    await page.locator('button:has-text("Create")').click();
    await page.waitForTimeout(2000);

    // Canvas should be visible with checkerboard (transparent)
    const canvas = page.locator("canvas").first();
    await expect(canvas).toBeVisible();
    await snap(page, "canvas-after-create");
  });

  test("03 - Brush Tool", async ({ page }) => {
    await page.goto("/editor");
    await page.waitForTimeout(2000);
    await createNewDocument(page);

    // Activate brush via toolbar
    await page.locator('[data-tool="brush"]').click();
    await page.waitForTimeout(300);
    await expect(page.locator('[data-tool-active="true"]')).toHaveAttribute("data-tool", "brush");
    await snap(page, "brush-tool-active");

    // Verify options bar shows size and opacity
    await expect(page.getByText("Size", { exact: true }).first()).toBeVisible();
    await expect(page.getByText("Opacity", { exact: true }).first()).toBeVisible();

    // Draw a brush stroke
    const box = await getCanvasBox(page);
    const before = await page.locator("canvas").first().screenshot();
    await page.mouse.move(box.x + 100, box.y + 200);
    await page.mouse.down();
    await page.mouse.move(box.x + 500, box.y + 300, { steps: 20 });
    await page.mouse.up();
    await page.waitForTimeout(500);
    const after = await page.locator("canvas").first().screenshot();
    expect(Buffer.compare(before, after)).not.toBe(0);
    await snap(page, "brush-stroke-drawn");

    // Change brush size via [ and ] keys
    await page.keyboard.press("]");
    await page.keyboard.press("]");
    await page.keyboard.press("]");
    await page.waitForTimeout(300);
    await snap(page, "brush-size-increased");
  });

  test("04 - Eraser Tool", async ({ page }) => {
    await page.goto("/editor");
    await page.waitForTimeout(2000);
    await createNewDocument(page);

    // Draw something first with brush
    await page.locator('[data-tool="brush"]').click();
    await page.waitForTimeout(300);
    const box = await getCanvasBox(page);
    await page.mouse.move(box.x + 200, box.y + 200);
    await page.mouse.down();
    await page.mouse.move(box.x + 500, box.y + 200, { steps: 15 });
    await page.mouse.up();
    await page.waitForTimeout(500);

    // Activate eraser via E key
    await page.keyboard.press("e");
    await page.waitForTimeout(300);
    await expect(page.locator('[data-tool-active="true"]')).toHaveAttribute("data-tool", "eraser");
    await snap(page, "eraser-tool-active");

    // Erase over the stroke
    await page.mouse.move(box.x + 300, box.y + 190);
    await page.mouse.down();
    await page.mouse.move(box.x + 400, box.y + 210, { steps: 10 });
    await page.mouse.up();
    await page.waitForTimeout(500);
    await snap(page, "eraser-stroke");
  });

  test("05 - Shape Tools", async ({ page }) => {
    await page.goto("/editor");
    await page.waitForTimeout(2000);
    await createNewDocument(page);
    const box = await getCanvasBox(page);

    // Rectangle
    await page.locator('[data-tool="shape-rect"]').click();
    await page.waitForTimeout(300);
    await snap(page, "shape-rect-options");

    await page.mouse.move(box.x + 100, box.y + 100);
    await page.mouse.down();
    await page.mouse.move(box.x + 300, box.y + 250, { steps: 10 });
    await page.mouse.up();
    await page.waitForTimeout(500);
    await snap(page, "shape-rect-drawn");

    // Switch to ellipse via shape dropdown if available
    const shapeDropdown = page.locator("select").first();
    if (await shapeDropdown.isVisible().catch(() => false)) {
      await shapeDropdown.selectOption("Ellipse");
      await page.waitForTimeout(300);
    }

    // Draw another shape
    await page.mouse.move(box.x + 400, box.y + 100);
    await page.mouse.down();
    await page.mouse.move(box.x + 600, box.y + 250, { steps: 10 });
    await page.mouse.up();
    await page.waitForTimeout(500);
    await snap(page, "shape-ellipse-drawn");

    // Select and move with move tool
    await page.locator('[data-tool="move"]').click();
    await page.waitForTimeout(300);
    await page.mouse.click(box.x + 200, box.y + 175);
    await page.waitForTimeout(500);
    await snap(page, "shape-selected-with-handles");
  });

  test("06 - Text Tool", async ({ page }) => {
    await page.goto("/editor");
    await page.waitForTimeout(2000);
    await createNewDocument(page);
    const box = await getCanvasBox(page);

    // Activate text tool via T key
    await page.keyboard.press("t");
    await page.waitForTimeout(300);
    await expect(page.locator('[data-tool-active="true"]')).toHaveAttribute("data-tool", "text");
    await snap(page, "text-tool-active");

    // Click on canvas to place text
    await page.mouse.click(box.x + 200, box.y + 200);
    await page.waitForTimeout(1000);

    // Type some text (textarea should be active)
    await page.keyboard.type("Hello SnapOtter!");
    await page.waitForTimeout(500);
    await snap(page, "text-typing");

    // Click away to finalize
    await page.mouse.click(box.x + 50, box.y + 50);
    await page.waitForTimeout(500);
    await snap(page, "text-finalized");
  });

  test("07 - Crop Tool", async ({ page }) => {
    await page.goto("/editor");
    await page.waitForTimeout(2000);
    await createNewDocument(page);
    const _box = await getCanvasBox(page);

    // Activate crop via C key
    await page.keyboard.press("c");
    await page.waitForTimeout(500);
    await expect(page.locator('[data-tool-active="true"]')).toHaveAttribute("data-tool", "crop");
    await snap(page, "crop-tool-active");

    // Verify crop options show aspect ratio
    const _cropOptions = page.getByText(/Free|1:1|4:3|16:9/);
    await snap(page, "crop-options-bar");
  });

  test("08 - Layer System", async ({ page }) => {
    await page.goto("/editor");
    await page.waitForTimeout(2000);
    await createNewDocument(page);

    // Layers tab should be active by default
    await expect(page.locator('[data-testid="tab-layers"]')).toBeVisible();
    await page.locator('[data-testid="tab-layers"]').click();
    await page.waitForTimeout(300);

    // Should see Layer 1
    await expect(page.getByText("Layer 1")).toBeVisible();
    await snap(page, "layers-panel-default");

    // Add a new layer via + button
    const _addLayerBtn = page
      .locator("button")
      .filter({ has: page.locator("svg") })
      .locator("xpath=//button[contains(@class, 'items-center')]")
      .first();
    // Try clicking the + icon at bottom of layers panel
    const _plusButtons = page
      .locator('[data-testid="tab-layers"]')
      .locator("..")
      .locator("..")
      .locator("button");
    await snap(page, "layers-before-add");

    // Use keyboard shortcut to add layer
    await page.keyboard.press("Control+Shift+n");
    await page.waitForTimeout(500);
    await snap(page, "layers-after-add");

    // Check blend mode dropdown
    const blendDropdown = page.locator("select").filter({ hasText: /Normal/ });
    if (await blendDropdown.isVisible().catch(() => false)) {
      await blendDropdown.click();
      await page.waitForTimeout(300);
      await snap(page, "blend-mode-dropdown");
    }

    // Toggle layer visibility
    const eyeIcons = page.locator(
      '[aria-label*="visibility" i], [aria-label*="toggle" i], [title*="visibility" i]',
    );
    if (
      await eyeIcons
        .first()
        .isVisible()
        .catch(() => false)
    ) {
      await eyeIcons.first().click();
      await page.waitForTimeout(300);
      await snap(page, "layer-visibility-toggled");
    }
  });

  test("09 - Color System", async ({ page }) => {
    await page.goto("/editor");
    await page.waitForTimeout(2000);
    await createNewDocument(page);

    // Foreground/background swatches should be visible
    await expect(page.getByText("Foreground")).toBeVisible();
    await snap(page, "color-panel-default");

    // Click foreground swatch to open picker
    const _fgSwatch = page.locator('[data-testid="color-foreground"]').or(
      page
        .locator("button")
        .filter({ hasText: /Foreground/ })
        .locator("..")
        .locator("button")
        .first(),
    );

    // Try clicking the color swatch area
    const colorArea = page.getByText("Foreground").locator("..").locator("button").first();
    if (await colorArea.isVisible().catch(() => false)) {
      await colorArea.click();
      await page.waitForTimeout(500);
      await snap(page, "color-picker-open");
    }

    // Test D key resets to black/white
    await page.keyboard.press("d");
    await page.waitForTimeout(300);
    await snap(page, "colors-reset-to-default");

    // Test X key swaps colors
    await page.keyboard.press("x");
    await page.waitForTimeout(300);
    await snap(page, "colors-swapped");
  });

  test("10 - Adjustments Panel", async ({ page }) => {
    await page.goto("/editor");
    await page.waitForTimeout(2000);
    await createNewDocument(page);

    // Switch to Adjustments tab
    await page.locator('[data-testid="tab-adjustments"]').click();
    await page.waitForTimeout(500);
    await snap(page, "adjustments-panel");

    // Verify adjustment sliders present
    await expect(page.getByText("Brightness", { exact: true })).toBeVisible();
    await expect(page.getByText("Contrast", { exact: true })).toBeVisible();
    await expect(page.getByText("Saturation", { exact: true })).toBeVisible();
    await snap(page, "adjustments-sliders");

    // Verify auto buttons
    await expect(page.getByText("Auto Tone")).toBeVisible();
    await expect(page.getByText("Auto Contrast")).toBeVisible();
    await snap(page, "auto-buttons");

    // Scroll to see levels section
    const panel = page
      .locator('[data-testid="tab-adjustments"]')
      .locator("..")
      .locator("..")
      .locator("div.overflow-y-auto");
    if (await panel.isVisible().catch(() => false)) {
      await panel.evaluate((el) => (el.scrollTop = 400));
      await page.waitForTimeout(500);
      await snap(page, "levels-section");

      await panel.evaluate((el) => (el.scrollTop = 800));
      await page.waitForTimeout(500);
      await snap(page, "curves-section");

      await panel.evaluate((el) => (el.scrollTop = 1200));
      await page.waitForTimeout(500);
      await snap(page, "filters-section");
    }
  });

  test("11 - History & Undo/Redo", async ({ page }) => {
    await page.goto("/editor");
    await page.waitForTimeout(2000);
    await createNewDocument(page);
    const box = await getCanvasBox(page);

    // Draw a shape
    await page.locator('[data-tool="shape-rect"]').click();
    await page.waitForTimeout(300);
    await page.mouse.move(box.x + 100, box.y + 100);
    await page.mouse.down();
    await page.mouse.move(box.x + 300, box.y + 250, { steps: 10 });
    await page.mouse.up();
    await page.waitForTimeout(500);

    // Draw a brush stroke
    await page.keyboard.press("b");
    await page.waitForTimeout(300);
    await page.mouse.move(box.x + 400, box.y + 150);
    await page.mouse.down();
    await page.mouse.move(box.x + 600, box.y + 300, { steps: 15 });
    await page.mouse.up();
    await page.waitForTimeout(500);

    // Open history panel
    await page.locator('[data-testid="tab-history"]').click();
    await page.waitForTimeout(500);
    await snap(page, "history-with-actions");

    // Verify history entries exist
    const _historyEntries = page
      .locator('[data-testid="tab-history"]')
      .locator("..")
      .locator("..")
      .locator("div.overflow-y-auto");
    await snap(page, "history-panel-entries");

    // Undo with Ctrl+Z
    const beforeUndo = await page.locator("canvas").first().screenshot();
    await page.keyboard.press("Control+z");
    await page.waitForTimeout(500);
    const afterUndo = await page.locator("canvas").first().screenshot();
    expect(Buffer.compare(beforeUndo, afterUndo)).not.toBe(0);
    await snap(page, "after-undo");

    // Redo with Ctrl+Shift+Z
    await page.keyboard.press("Control+Shift+z");
    await page.waitForTimeout(500);
    await snap(page, "after-redo");
  });

  test("12 - Keyboard Shortcuts", async ({ page }) => {
    await page.goto("/editor");
    await page.waitForTimeout(2000);
    await createNewDocument(page);

    const toolShortcuts: [string, string][] = [
      ["v", "move"],
      ["b", "brush"],
      ["e", "eraser"],
      ["u", "shape-rect"],
      ["t", "text"],
      ["c", "crop"],
      ["i", "eyedropper"],
      ["h", "hand"],
      ["z", "zoom"],
      ["m", "marquee-rect"],
      ["g", "fill"],
    ];

    for (const [key, _expectedTool] of toolShortcuts) {
      await page.keyboard.press(key);
      await page.waitForTimeout(200);
      const activeTool = page.locator('[data-tool-active="true"]');
      const toolAttr = await activeTool.getAttribute("data-tool");
      // Just verify the active tool changed (some tools may have different sub-types)
      expect(toolAttr).toBeTruthy();
    }
    await snap(page, "keyboard-shortcuts-tested");

    // Test D resets colors
    await page.keyboard.press("d");
    await page.waitForTimeout(200);

    // Test X swaps
    await page.keyboard.press("x");
    await page.waitForTimeout(200);
    await snap(page, "color-shortcuts-tested");
  });

  test("13 - Right Panel Toggle", async ({ page }) => {
    await page.goto("/editor");
    await page.waitForTimeout(2000);
    await createNewDocument(page);

    // Panel should be visible
    await expect(page.locator('[data-testid="tab-layers"]')).toBeVisible();
    await snap(page, "panel-visible");

    // Press Tab to toggle panel
    await page.keyboard.press("Tab");
    await page.waitForTimeout(500);
    await snap(page, "panel-collapsed");

    // Press Tab again to restore
    await page.keyboard.press("Tab");
    await page.waitForTimeout(500);
    await snap(page, "panel-restored");
  });

  test("14 - Multiple Shapes & Move", async ({ page }) => {
    await page.goto("/editor");
    await page.waitForTimeout(2000);
    await createNewDocument(page);
    const box = await getCanvasBox(page);

    // Draw 3 shapes
    await page.locator('[data-tool="shape-rect"]').click();
    await page.waitForTimeout(300);

    // Shape 1
    await page.mouse.move(box.x + 50, box.y + 50);
    await page.mouse.down();
    await page.mouse.move(box.x + 200, box.y + 150, { steps: 5 });
    await page.mouse.up();
    await page.waitForTimeout(300);

    // Shape 2
    await page.mouse.move(box.x + 250, box.y + 50);
    await page.mouse.down();
    await page.mouse.move(box.x + 400, box.y + 150, { steps: 5 });
    await page.mouse.up();
    await page.waitForTimeout(300);

    // Shape 3
    await page.mouse.move(box.x + 450, box.y + 50);
    await page.mouse.down();
    await page.mouse.move(box.x + 600, box.y + 150, { steps: 5 });
    await page.mouse.up();
    await page.waitForTimeout(300);
    await snap(page, "three-shapes-drawn");

    // Switch to move tool and select shape
    await page.keyboard.press("v");
    await page.waitForTimeout(300);
    await page.mouse.click(box.x + 125, box.y + 100);
    await page.waitForTimeout(500);
    await snap(page, "shape-selected");

    // Drag it
    await page.mouse.move(box.x + 125, box.y + 100);
    await page.mouse.down();
    await page.mouse.move(box.x + 125, box.y + 300, { steps: 10 });
    await page.mouse.up();
    await page.waitForTimeout(500);
    await snap(page, "shape-moved");

    // Delete with Delete key
    await page.mouse.click(box.x + 325, box.y + 100);
    await page.waitForTimeout(300);
    await page.keyboard.press("Delete");
    await page.waitForTimeout(500);
    await snap(page, "shape-deleted");
  });

  test("15 - Export Dialog", async ({ page }) => {
    await page.goto("/editor");
    await page.waitForTimeout(2000);
    await createNewDocument(page);
    const box = await getCanvasBox(page);

    // Draw something
    await page.locator('[data-tool="shape-rect"]').click();
    await page.waitForTimeout(300);
    await page.mouse.move(box.x + 200, box.y + 150);
    await page.mouse.down();
    await page.mouse.move(box.x + 500, box.y + 350, { steps: 10 });
    await page.mouse.up();
    await page.waitForTimeout(500);

    // Open export dialog via Ctrl+Shift+S
    await page.keyboard.press("Control+Shift+s");
    await page.waitForTimeout(1000);
    await snap(page, "export-dialog");

    // Check format options
    const pngBtn = page.getByText("PNG");
    const jpegBtn = page.getByText("JPEG");
    const webpBtn = page.getByText("WebP");

    if (await pngBtn.isVisible().catch(() => false)) {
      await expect(pngBtn).toBeVisible();
      await expect(jpegBtn).toBeVisible();
      await expect(webpBtn).toBeVisible();

      // Select JPEG to see quality slider
      await jpegBtn.click();
      await page.waitForTimeout(300);
      await snap(page, "export-jpeg-quality");
    }
  });

  test("16 - Clone Stamp Tool", async ({ page }) => {
    await page.goto("/editor");
    await page.waitForTimeout(2000);
    await createNewDocument(page);

    // Activate clone stamp via S key
    await page.keyboard.press("s");
    await page.waitForTimeout(300);
    await expect(page.locator('[data-tool-active="true"]')).toHaveAttribute(
      "data-tool",
      "clone-stamp",
    );
    await snap(page, "clone-stamp-active");

    // Verify options bar
    await expect(page.getByText("Size")).toBeVisible();
  });

  test("17 - Dodge/Burn/Sponge Tool", async ({ page }) => {
    await page.goto("/editor");
    await page.waitForTimeout(2000);
    await createNewDocument(page);

    // Activate dodge via O key
    await page.keyboard.press("o");
    await page.waitForTimeout(300);
    await snap(page, "dodge-tool-active");

    // Check options show range and exposure
    const _optionsBar = page
      .locator("div")
      .filter({ hasText: /Range|Exposure|Dodge|Burn|Sponge/ })
      .first();
    await snap(page, "dodge-burn-options");
  });

  test("18 - Selection Tools", async ({ page }) => {
    await page.goto("/editor");
    await page.waitForTimeout(2000);
    await createNewDocument(page);
    const box = await getCanvasBox(page);

    // Marquee selection via M key
    await page.keyboard.press("m");
    await page.waitForTimeout(300);
    await snap(page, "marquee-tool-active");

    // Draw a selection
    await page.mouse.move(box.x + 100, box.y + 100);
    await page.mouse.down();
    await page.mouse.move(box.x + 400, box.y + 300, { steps: 10 });
    await page.mouse.up();
    await page.waitForTimeout(500);
    await snap(page, "marquee-selection-drawn");

    // Lasso via L key
    await page.keyboard.press("l");
    await page.waitForTimeout(300);
    await snap(page, "lasso-tool-active");

    // Magic wand via W key
    await page.keyboard.press("w");
    await page.waitForTimeout(300);
    await snap(page, "magic-wand-active");
  });

  test("19 - Gradient & Fill Tools", async ({ page }) => {
    await page.goto("/editor");
    await page.waitForTimeout(2000);
    await createNewDocument(page);

    // Fill tool via G key
    await page.keyboard.press("g");
    await page.waitForTimeout(300);
    await snap(page, "fill-tool-active");

    // Check tolerance option
    await expect(page.getByText("Tolerance")).toBeVisible();
    await snap(page, "fill-options");
  });

  test("20 - Navigator Panel", async ({ page }) => {
    await page.goto("/editor");
    await page.waitForTimeout(2000);
    await createNewDocument(page);

    // Navigator should show minimap
    await page.waitForTimeout(1000);
    await snap(page, "navigator-minimap");
  });

  test("21 - Status Bar", async ({ page }) => {
    await page.goto("/editor");
    await page.waitForTimeout(2000);
    await createNewDocument(page);

    // Verify zoom percentage
    const zoomInput = page.locator('[data-testid="status-zoom"] input');
    if (await zoomInput.isVisible().catch(() => false)) {
      const zoomValue = await zoomInput.inputValue();
      expect(Number(zoomValue)).toBeGreaterThan(0);
    }

    // Verify dimensions
    const dimensions = page.locator('[data-testid="status-dimensions"]');
    if (await dimensions.isVisible().catch(() => false)) {
      const text = await dimensions.textContent();
      expect(text).toContain("1920");
      expect(text).toContain("1080");
    }
    await snap(page, "status-bar");
  });
});