import { describe, expect, it } from "vitest"
import { evaluateExpression, resolvePath } from "../src/core/expression"
import type { ScopeFrame } from "../src/core/expression"

const scopes: ScopeFrame[] = [
  {
    type: "data",
    values: {
      user: {
        name: "张三",
        level: 4,
        type: "developer",
        isVip: true
      },
      tags: ["important", "draft"],
      items: [
        { title: "A", price: 1 },
        { title: "B", price: 2 }
      ],
      disabled: false
    }
  }
]

describe("expression evaluator", () => {
  it("resolves nested paths and array access", () => {
    expect(resolvePath("user.name", scopes)).toMatchObject({
      found: true,
      value: "张三"
    })
    expect(resolvePath("items[0].title", scopes)).toMatchObject({
      found: true,
      value: "A"
    })
  })

  it("evaluates comparisons", () => {
    expect(evaluateExpression("user.level >= 3", scopes)).toMatchObject({
      ok: true,
      value: true
    })
    expect(evaluateExpression("user.type == \"developer\"", scopes)).toMatchObject({
      ok: true,
      value: true
    })
  })

  it("evaluates logical operators", () => {
    expect(evaluateExpression("user.isVip && user.level >= 3", scopes)).toMatchObject({
      ok: true,
      value: true
    })
    expect(evaluateExpression("!disabled", scopes)).toMatchObject({
      ok: true,
      value: true
    })
  })

  it("evaluates contains", () => {
    expect(evaluateExpression("tags contains \"important\"", scopes)).toMatchObject({
      ok: true,
      value: true
    })
  })

  it("evaluates length access", () => {
    expect(evaluateExpression("items.length > 0", scopes)).toMatchObject({
      ok: true,
      value: true
    })
  })

  it("evaluates nullish fallback", () => {
    expect(evaluateExpression("missing.name ?? \"未命名\"", scopes)).toMatchObject({
      ok: true,
      value: "未命名"
    })
  })
})