import { expect, test, type Page, type Route } from "@playwright/test"
import { base64Encode } from "@opencode-ai/core/util/encode"

const server = "http://127.0.0.1:4096"
const sessionA = session("ses_tab_a", "Tab A session")
const sessionB = session("ses_tab_b", "Tab B session")

test("pressing mouse down on a tab navigates before mouse up", async ({ page }) => {
  await mockServer(page)
  await page.addInitScript(
    ({ server, sessionA, sessionB }) => {
      localStorage.setItem("settings.v3", JSON.stringify({ general: { newLayoutDesigns: true } }))
      localStorage.setItem(
        "opencode.window.browser.dat:tabs",
        JSON.stringify([
          { type: "session", server, sessionId: sessionA },
          { type: "session", server, sessionId: sessionB },
        ]),
      )
    },
    { server, sessionA: sessionA.id, sessionB: sessionB.id },
  )

  const hrefA = `/server/${base64Encode(server)}/session/${sessionA.id}`
  const hrefB = `/server/${base64Encode(server)}/session/${sessionB.id}`
  await page.goto(hrefA)
  await expect(page.getByText(sessionA.title).first()).toBeVisible()

  const linkB = page.locator(`a[data-titlebar-tab-link][href="${hrefB}"]`)
  await expect(linkB).toBeVisible()
  const box = await linkB.boundingBox()
  if (!box) throw new Error("tab link has no bounding box")
  await page.mouse.move(box.x + box.width / 2, box.y + box.height / 2)
  await page.mouse.down()

  // Navigation must happen on mousedown, before the button is released.
  await expect(page).toHaveURL(new RegExp(`${hrefB.replace(/[.*+?^${}()|[\]\\]/g, "\\$&")}$`))
  await page.mouse.up()
  await expect(page).toHaveURL(new RegExp(`${hrefB.replace(/[.*+?^${}()|[\]\\]/g, "\\$&")}$`))
})

function session(id: string, title: string) {
  return {
    id,
    slug: id,
    projectID: "project-tabs",
    directory: "C:/tab-project",
    title,
    version: "dev",
    time: { created: 1, updated: 1 },
  }
}

async function mockServer(page: Page) {
  const sessions = [sessionA, sessionB]
  await page.route("**/*", async (route) => {
    const url = new URL(route.request().url())
    if (url.origin !== server) return route.fallback()
    if (url.pathname === "/global/event" || url.pathname === "/event") return sse(route)
    if (url.pathname === "/global/health") return json(route, { healthy: true })
    if (url.pathname === "/session") return json(route, sessions)
    const byId = sessions.find((item) => url.pathname === `/session/${item.id}`)
    if (byId) return json(route, byId)
    if (/^\/session\/[^/]+$/.test(url.pathname)) return json(route, { name: "NotFoundError" }, 404)
    if (/^\/session\/[^/]+\/message$/.test(url.pathname)) return json(route, [])
    if (/^\/session\/[^/]+\/(children|todo|diff)$/.test(url.pathname)) return json(route, [])
    if (["/skill", "/command", "/lsp", "/formatter", "/permission", "/question", "/vcs/diff"].includes(url.pathname))
      return json(route, [])
    if (["/global/config", "/config", "/provider/auth", "/mcp", "/session/status"].includes(url.pathname))
      return json(route, {})
    if (url.pathname === "/provider")
      return json(route, { all: [], connected: [], default: { providerID: "", modelID: "" } })
    if (url.pathname === "/agent") return json(route, [{ name: "build", mode: "primary" }])
    if (url.pathname === "/project" || url.pathname === "/project/current") {
      const project = {
        id: sessionA.projectID,
        worktree: sessionA.directory,
        vcs: "git",
        time: { created: 1, updated: 1 },
        sandboxes: [],
      }
      return json(route, url.pathname === "/project" ? [project] : project)
    }
    if (url.pathname === "/path")
      return json(route, {
        state: sessionA.directory,
        config: sessionA.directory,
        worktree: sessionA.directory,
        directory: sessionA.directory,
        home: sessionA.directory,
      })
    if (url.pathname === "/vcs") return json(route, { branch: "main", default_branch: "main" })
    return json(route, {})
  })
}

function json(route: Route, body: unknown, status = 200) {
  return route.fulfill({
    status,
    contentType: "application/json",
    headers: { "access-control-allow-origin": "*" },
    body: JSON.stringify(body),
  })
}

function sse(route: Route) {
  return route.fulfill({ status: 200, contentType: "text/event-stream", body: ": ok\n\n" })
}