import { expect, test } from "vitest"

import { applyDeltaToNumberContent, applyDeltaToTextContent } from "#Source/aio/index.ts"

test("applyDeltaToTextContent appends, conditionally removes, resets and keeps prior snapshots immutable", () => {
  const initial = {
    deltaList: [],
    total: "",
  }

  const appended = applyDeltaToTextContent(initial, {
    type: "append",
    text: "mobius",
  })
  const removed = applyDeltaToTextContent(appended, {
    type: "remove",
    text: "ius",
  })
  const unchangedRemove = applyDeltaToTextContent(removed, {
    type: "remove",
    text: "xyz",
  })
  const reset = applyDeltaToTextContent(unchangedRemove, {
    type: "reset",
  })

  expect(initial).toEqual({
    deltaList: [],
    total: "",
  })
  expect(appended).toEqual({
    deltaList: [{ type: "append", text: "mobius" }],
    total: "mobius",
  })
  expect(removed).toEqual({
    deltaList: [
      { type: "append", text: "mobius" },
      { type: "remove", text: "ius" },
    ],
    total: "mob",
  })
  expect(unchangedRemove).toEqual({
    deltaList: [
      { type: "append", text: "mobius" },
      { type: "remove", text: "ius" },
      { type: "remove", text: "xyz" },
    ],
    total: "mob",
  })
  expect(reset).toEqual({
    deltaList: [
      { type: "append", text: "mobius" },
      { type: "remove", text: "ius" },
      { type: "remove", text: "xyz" },
      { type: "reset" },
    ],
    total: "",
  })
})

test("applyDeltaToNumberContent accumulates, subtracts, resets and keeps prior snapshots immutable", () => {
  const initial = {
    deltaList: [],
    total: 0,
  }

  const appended = applyDeltaToNumberContent(initial, {
    type: "append",
    value: 10,
  })
  const removed = applyDeltaToNumberContent(appended, {
    type: "remove",
    value: 3,
  })
  const reset = applyDeltaToNumberContent(removed, {
    type: "reset",
  })

  expect(initial).toEqual({
    deltaList: [],
    total: 0,
  })
  expect(appended).toEqual({
    deltaList: [{ type: "append", value: 10 }],
    total: 10,
  })
  expect(removed).toEqual({
    deltaList: [
      { type: "append", value: 10 },
      { type: "remove", value: 3 },
    ],
    total: 7,
  })
  expect(reset).toEqual({
    deltaList: [{ type: "append", value: 10 }, { type: "remove", value: 3 }, { type: "reset" }],
    total: 0,
  })
})