import { describe, expect, test } from "bun:test"
import { cycleVariant, formatModelLabel, pickVariant, resolveVariant } from "../../src/mini/variant.shared"
import type { RunSession } from "../../src/mini/session.shared"
import type { RunProvider } from "../../src/mini/types"

const model = {
  providerID: "openai",
  modelID: "gpt-5",
}

const providers: RunProvider[] = [
  {
    id: "openai",
    name: "OpenAI",
    source: "api",
    env: [],
    options: {},
    models: {
      "gpt-5": {
        id: "gpt-5",
        providerID: "openai",
        api: {
          id: "gpt-5",
          url: "https://openai.test",
          npm: "@ai-sdk/openai",
        },
        name: "GPT-5",
        capabilities: {
          temperature: true,
          reasoning: true,
          attachment: true,
          toolcall: true,
          input: {
            text: true,
            audio: false,
            image: false,
            video: false,
            pdf: false,
          },
          output: {
            text: true,
            audio: false,
            image: false,
            video: false,
            pdf: false,
          },
          interleaved: false,
        },
        cost: {
          input: 0,
          output: 0,
          cache: {
            read: 0,
            write: 0,
          },
        },
        limit: {
          context: 128000,
          output: 8192,
        },
        status: "active",
        options: {},
        headers: {},
        release_date: "2026-01-01",
      },
    },
  },
]

describe("run variant shared", () => {
  test("prefers cli then session then saved variants", () => {
    expect(resolveVariant("max", "high", "low", ["low", "high"])).toBe("max")
    expect(resolveVariant(undefined, "high", "low", ["low", "high"])).toBe("high")
    expect(resolveVariant(undefined, "missing", "low", ["low", "high"])).toBe("low")
  })

  test("cycles through variants and back to default", () => {
    expect(cycleVariant(undefined, ["low", "high"])).toBe("low")
    expect(cycleVariant("low", ["low", "high"])).toBe("high")
    expect(cycleVariant("high", ["low", "high"])).toBeUndefined()
    expect(cycleVariant(undefined, [])).toBeUndefined()
  })

  test("formats model labels", () => {
    expect(formatModelLabel(model, undefined)).toBe("gpt-5 · openai")
    expect(formatModelLabel(model, "high")).toBe("gpt-5 · openai · high")
    expect(formatModelLabel(model, undefined, providers)).toBe("GPT-5 · OpenAI")
    expect(formatModelLabel(model, "high", providers)).toBe("GPT-5 · OpenAI · high")
  })

  test("picks the latest matching variant from session history", () => {
    const session: RunSession = {
      first: false,
      turns: [
        { prompt: { text: "one", parts: [] }, provider: "openai", model: "gpt-5", variant: "high" },
        { prompt: { text: "two", parts: [] }, provider: "anthropic", model: "sonnet", variant: "max" },
        { prompt: { text: "three", parts: [] }, provider: "openai", model: "gpt-5", variant: "minimal" },
      ],
    }

    expect(pickVariant(model, session)).toBe("minimal")
  })

})