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import { describe, expect, test } from "bun:test"
import { createTextFragment, getCursorPosition, getNodeLength, getTextLength, setCursorPosition } from "./editor-dom"
describe("prompt-input editor dom", () => {
test("createTextFragment preserves newlines with consecutive br nodes", () => {
const fragment = createTextFragment("foo\n\nbar")
const container = document.createElement("div")
container.appendChild(fragment)
expect(container.childNodes.length).toBe(4)
expect(container.childNodes[0]?.textContent).toBe("foo")
expect((container.childNodes[1] as HTMLElement).tagName).toBe("BR")
expect((container.childNodes[2] as HTMLElement).tagName).toBe("BR")
expect(container.childNodes[3]?.textContent).toBe("bar")
})
test("createTextFragment keeps trailing newline as terminal break", () => {
const fragment = createTextFragment("foo\n")
const container = document.createElement("div")
container.appendChild(fragment)
expect(container.childNodes.length).toBe(2)
expect(container.childNodes[0]?.textContent).toBe("foo")
expect((container.childNodes[1] as HTMLElement).tagName).toBe("BR")
})
test("createTextFragment avoids break-node explosion for large multiline content", () => {
const content = Array.from({ length: 220 }, () => "line").join("\n")
const fragment = createTextFragment(content)
const container = document.createElement("div")
container.appendChild(fragment)
expect(container.childNodes.length).toBe(1)
expect(container.childNodes[0]?.nodeType).toBe(Node.TEXT_NODE)
expect(container.textContent).toBe(content)
})
test("createTextFragment keeps terminal break in large multiline fallback", () => {
const content = `${Array.from({ length: 220 }, () => "line").join("\n")}\n`
const fragment = createTextFragment(content)
const container = document.createElement("div")
container.appendChild(fragment)
expect(container.childNodes.length).toBe(2)
expect(container.childNodes[0]?.textContent).toBe(content.slice(0, -1))
expect((container.childNodes[1] as HTMLElement).tagName).toBe("BR")
})
test("length helpers treat breaks as one char and ignore zero-width chars", () => {
const container = document.createElement("div")
container.appendChild(document.createTextNode("ab\u200B"))
container.appendChild(document.createElement("br"))
container.appendChild(document.createTextNode("cd"))
expect(getNodeLength(container.childNodes[0]!)).toBe(2)
expect(getNodeLength(container.childNodes[1]!)).toBe(1)
expect(getTextLength(container)).toBe(5)
})
test("setCursorPosition and getCursorPosition round-trip with pills and breaks", () => {
const container = document.createElement("div")
const pill = document.createElement("span")
pill.dataset.type = "file"
pill.textContent = "@file"
container.appendChild(document.createTextNode("ab"))
container.appendChild(pill)
container.appendChild(document.createElement("br"))
container.appendChild(document.createTextNode("cd"))
document.body.appendChild(container)
setCursorPosition(container, 2)
expect(getCursorPosition(container)).toBe(2)
setCursorPosition(container, 7)
expect(getCursorPosition(container)).toBe(7)
setCursorPosition(container, 8)
expect(getCursorPosition(container)).toBe(8)
container.remove()
})
test("setCursorPosition and getCursorPosition round-trip across blank lines", () => {
const container = document.createElement("div")
container.appendChild(document.createTextNode("a"))
container.appendChild(document.createElement("br"))
container.appendChild(document.createElement("br"))
container.appendChild(document.createTextNode("b"))
document.body.appendChild(container)
setCursorPosition(container, 2)
expect(getCursorPosition(container)).toBe(2)
setCursorPosition(container, 3)
expect(getCursorPosition(container)).toBe(3)
container.remove()
})
})
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