// @vitest-environment node
import { afterEach, beforeEach, describe, expect, it, vi } from "vitest"

// No DNS in tests: only loopback addresses are private
vi.mock("@/lib/ssrf-protection", async (importOriginal) => ({
    ...(await importOriginal<typeof import("@/lib/ssrf-protection")>()),
    isPrivateUrl: async (url: string) =>
        /^https?:\/\/(127\.0\.0\.1|localhost)\b/.test(url),
}))

import { POST as chat } from "@/app/api/chat/route"

const ENV = [
    "AI_PROVIDER",
    "AI_MODEL",
    "OPENAI_API_KEY",
    "OLLAMA_BASE_URL",
    "OLLAMA_API_KEY",
    "NEXT_AI_DRAWIO_DESKTOP",
]
const saved: Record<string, string | undefined> = {}

beforeEach(() => {
    for (const k of ENV) saved[k] = process.env[k]
    for (const k of ENV) delete process.env[k]
})

afterEach(() => {
    for (const k of ENV) {
        if (saved[k] === undefined) delete process.env[k]
        else process.env[k] = saved[k]
    }
    vi.unstubAllGlobals()
})

/** Every provider request answers with this status and text */
const providerAnswers = (status: number, body: string) =>
    vi.stubGlobal(
        "fetch",
        vi.fn(
            async () =>
                new Response(body, {
                    status,
                    headers: { "Content-Type": "application/json" },
                }),
        ),
    )

/** The error text the chat panel gets from the stream */
async function streamedError(headers: Record<string, string>) {
    const res = await chat(
        new Request("http://localhost/api/chat", {
            method: "POST",
            headers: { "Content-Type": "application/json", ...headers },
            body: JSON.stringify({
                messages: [
                    {
                        id: "u1",
                        role: "user",
                        parts: [{ type: "text", text: "Draw two boxes" }],
                    },
                ],
                xml: "",
            }),
        }),
    )
    const text = await res.text()
    const line = text.split("\n").find((l) => l.includes('"type":"error"'))
    return line ? JSON.parse(JSON.parse(line.slice(6)).errorText).message : ""
}

describe("provider error texts in the stream", () => {
    it("shows the user's own local Ollama error in the desktop app", async () => {
        process.env.NEXT_AI_DRAWIO_DESKTOP = "1"
        process.env.AI_PROVIDER = "ollama"
        process.env.AI_MODEL = "llama3"
        // Ollama is not running
        vi.stubGlobal(
            "fetch",
            vi.fn(async () => {
                throw Object.assign(new TypeError("fetch failed"), {
                    cause: new Error("connect ECONNREFUSED 127.0.0.1:11434"),
                })
            }),
        )
        expect(await streamedError({})).toMatch(
            /127\.0\.0\.1:11434|fetch failed/,
        )
        // The SDK retries a refused connection twice, waiting between
    }, 20_000)

    it("shows EdgeOne's own daily quota explanation", async () => {
        // The function answers 429, which the SDK retries with a wait;
        // the status does not decide whether the text is shown
        providerAnswers(
            400,
            JSON.stringify({
                error: {
                    message:
                        "The daily public quota has been exhausted. After deployment, you can enjoy a personal daily exclusive quota.",
                },
            }),
        )
        expect(
            await streamedError({
                "x-ai-provider": "edgeone",
                "x-ai-model": "@tx/deepseek-ai/deepseek-v3-0324",
            }),
        ).toMatch(/daily public quota/)
    })

    it("hides the provider's text on the server's own key", async () => {
        process.env.AI_PROVIDER = "openai"
        process.env.AI_MODEL = "gpt-5.5"
        process.env.OPENAI_API_KEY = "server-key"
        providerAnswers(
            403,
            JSON.stringify({
                error: { message: "Organization org-operator is suspended" },
            }),
        )
        const message = await streamedError({})
        expect(message).not.toMatch(/org-operator/)
        expect(message).toBe("The provider returned an error.")
    })
})