using Microsoft.Playwright;

namespace decePubClient.E2E.Support
{
	// Signs a town persona in through the real login page and persona chooser, once per persona per run; later sessions
	// start from the saved browser state (the AuthData decePub keeps in localStorage).
	public static class SignIn
	{
		static readonly string StateDir = Path.Combine(AppContext.BaseDirectory, ".state");

		public static async Task<Session> As(Browser browser, Pasture.Persona persona, bool fresh = false)
		{
			var state = Path.Combine(StateDir, persona.UserName + ".json");
			if (!fresh && File.Exists(state))
			{
				var known = await browser.Open(state);
				await known.Page.GotoAsync(Pasture.Site + "/");
				await known.Page.Locator("article[data-uri], [data-feed-empty]").First.WaitForAsync(new() { Timeout = 30000 });
				return known;
			}
			var session = await browser.Open();
			await Through(session.Page, persona);
			Directory.CreateDirectory(StateDir);
			await session.Context.StorageStateAsync(new() { Path = state });
			return session;
		}

		public static async Task Through(IPage page, Pasture.Persona persona)
		{
			try
			{
				await Steps(page, persona);
			}
			catch
			{
				await Evidence(page, "signin-" + persona.UserName);
				throw;
			}
		}

		// a screenshot and the page's text next to the test output, for a failure seen only in a headless browser
		public static async Task Evidence(IPage page, string name)
		{
			Directory.CreateDirectory(StateDir);
			await page.ScreenshotAsync(new() { Path = Path.Combine(StateDir, name + ".png"), FullPage = true });
			await File.WriteAllTextAsync(Path.Combine(StateDir, name + ".txt"), page.Url + "\n" + await page.InnerTextAsync("body"));
		}

		static async Task Steps(IPage page, Pasture.Persona persona)
		{
			await page.GotoAsync(Pasture.Site + "/login");
			await page.Locator("input[autocomplete=username]").FillAsync(persona.Root);
			await page.Locator("input[autocomplete=current-password]").FillAsync(persona.Password);
			await page.Locator("button[type=submit]").ClickAsync();
			// a root with several personas picks one; one with a single persona goes on by itself, its button disabled while it
			// does. Only the login page's chooser is clicked: the feed's persona switcher names the persona too
			var chooser = page.Locator("section button:enabled").Filter(new() { HasText = persona.UserName + "@privapub.test" });
			var until = DateTime.UtcNow.AddSeconds(30);
			while (new Uri(page.Url).AbsolutePath != "/" && DateTime.UtcNow < until)
			{
				if (await chooser.CountAsync() > 0)
					try
					{
						await chooser.First.ClickAsync(new() { Timeout = 2000 });
					}
					catch (TimeoutException)
					{
					}
				await page.WaitForTimeoutAsync(250);
			}
			await page.WaitForURLAsync(url => new Uri(url).AbsolutePath == "/", new() { Timeout = 30000 });
			// (a new persona's feed is empty)
			await page.Locator("article[data-uri], [data-feed-empty]").First.WaitForAsync(new() { Timeout = 30000 });
		}
	}
}