//go:build browser

package gallery

import (
	"context"
	"net/http"
	"testing"
	"time"

	"github.com/chromedp/cdproto/emulation"
	"github.com/chromedp/chromedp"

	"amadan.net/rastrillo/fiesta/internal/gallery/galleryrig"
	"amadan.net/rastrillo/fiesta/internal/harness"
)

// The shared drive helpers, under the names the ported drives are
// written with. One line each: the implementation is galleryrig's,
// which the history package uses too, so the two cannot drift.
// Fiesta's own drives keep newTree in a11y_browser_test.go, which
// records every request as well.

func treeHandler(t *testing.T) http.Handler {
	t.Helper()
	return galleryrig.Tree(t, render(t, mountPath), mountPath+"/")
}

func eagerly(t *testing.T, ctx context.Context, where string) {
	t.Helper()
	galleryrig.Eagerly(t, ctx, where)
}

func mobileSettle(t *testing.T, ctx context.Context, where string) {
	t.Helper()
	galleryrig.MobileSettle(t, ctx, where)
}

func addInit(js string) chromedp.Action { return galleryrig.AddInit(js) }

func until(t *testing.T, ctx context.Context, where, expr string) {
	t.Helper()
	galleryrig.Until(t, ctx, where, expr)
}

func phoneRig(t *testing.T, opts ...harness.Option) *harness.Rig {
	t.Helper()
	return galleryrig.PhoneRig(t, func() http.Handler { return treeHandler(t) }, opts...)
}

func requireDrawnScrollbar(t *testing.T, ctx context.Context, where string) {
	t.Helper()
	galleryrig.RequireDrawnScrollbar(t, ctx, where)
}

func requireCoarse(t *testing.T, ctx context.Context) {
	t.Helper()
	galleryrig.RequireCoarse(t, ctx)
}

func settleMotion(t *testing.T, ctx context.Context, where string) {
	t.Helper()
	galleryrig.SettleMotion(t, ctx, where)
}

func noScripts(t *testing.T, ctx context.Context) context.Context {
	t.Helper()
	return galleryrig.NoScripts(t, ctx)
}

func requireScriptsOff(t *testing.T, ctx context.Context, where string) {
	t.Helper()
	galleryrig.RequireScriptsOff(t, ctx, where)
}

// TestTheRigServesTheTreeAtItsMount: the shared tree answers for a
// file of the render under the mount and records a miss for a path
// it has not got, so a drive that frames a missing document fails by
// name. The bindings above are exercised by the drives that use them.
func TestTheRigServesTheTreeAtItsMount(t *testing.T) {
	files := render(t, mountPath)
	var missed []string
	h := galleryrig.TreeRecording(t, files, mountPath+"/", func(p string) { missed = append(missed, p) })
	rig := harness.New(t, func(string) http.Handler { return h })
	rig.Allow(http.MethodGet, mountPath+"/no-such-file.html", http.StatusNotFound)
	ctx, cancel := context.WithTimeout(rig.Context(), 30*time.Second)
	defer cancel()
	var title string
	mustRun(t, ctx,
		chromedp.Navigate(rig.Origin+href("day/en/index.html")),
		chromedp.WaitReady("body"),
		chromedp.Evaluate(`document.title`, &title),
	)
	if title == "" {
		t.Error("the Overview served through the rig has no title")
	}
	mustRun(t, ctx, chromedp.Navigate(rig.Origin+href("no-such-file.html")), chromedp.WaitReady("body"))
	if len(missed) != 1 || missed[0] != href("no-such-file.html") {
		t.Errorf("the rig recorded the misses %v, want the one path asked for", missed)
	}
}

// TestTheSharedRigDrivesAPhone exercises every binding above on one
// page, so a helper that stopped matching the markup fails here rather
// than in the first ported drive that leans on it: a phone rig with a
// drawn scrollbar, an init script that runs before the page, the frames
// settled at a phone's width, motion waited out, a condition polled,
// and a second tab with scripts off that proves it.
func TestTheSharedRigDrivesAPhone(t *testing.T) {
	rig := phoneRig(t, harness.WithScrollbars())
	ctx, cancel := context.WithTimeout(rig.Context(), 2*time.Minute)
	defer cancel()
	mustRun(t, ctx,
		addInit(`window.__galleryInit = true`),
		chromedp.ActionFunc(func(c context.Context) error {
			return emulation.SetDeviceMetricsOverride(320, 640, 1, false).Do(c)
		}),
		chromedp.Navigate(rig.Origin+href("day/en/button.html")),
		chromedp.WaitReady("body"),
	)
	requireCoarse(t, ctx)
	requireDrawnScrollbar(t, ctx, "button")
	var init bool
	mustRun(t, ctx, chromedp.Evaluate(`window.__galleryInit === true`, &init))
	if !init {
		t.Error("the init script did not run before the page's own")
	}
	eagerly(t, ctx, "button")
	mobileSettle(t, ctx, "button")
	settleMotion(t, ctx, "button")
	until(t, ctx, "button", `document.querySelectorAll(".ds-view__frame[data-gallery-painted]").length > 0`)
	var on bool
	mustRun(t, ctx, chromedp.Evaluate(`document.documentElement.hasAttribute("data-gallery-js")`, &on))
	if !on {
		t.Error("the scripted tab did not run the gallery's script")
	}

	off := noScripts(t, rig.Context())
	mustRun(t, off, chromedp.Navigate(rig.Origin+href("day/en/button.html")), chromedp.WaitReady("body"))
	requireScriptsOff(t, off, "button with scripts off")
	rig.Screen("main", "the button page on a phone")
}