import fs from 'fs';
import os from 'os';
import path from 'path';
import { pathToFileURL } from 'url';
import { afterEach, describe, expect, it, vi } from 'vitest';
import {
    guessFileNameFromUrl,
    loadBinarySource,
    resolveLocalFilePath,
} from '@snowluma/protocol/highway/utils';

describe('highway source paths', () => {
    it('normalizes file URLs with an extra leading slash on POSIX', () => {
        if (process.platform === 'win32') {
            return;
        }

        expect(resolveLocalFilePath('file:////AstrBot/data/plugin/cache/BV-test.mp4')).toBe(
            '/AstrBot/data/plugin/cache/BV-test.mp4',
        );
    });

    it('percent-decodes a URL basename used as the upload filename (#354)', () => {
        expect(
            guessFileNameFromUrl('file:///D:/test/%E6%B5%8B%E8%AF%95%E6%96%87%E4%BB%B6.xlsx'),
        ).toBe('测试文件.xlsx');
        expect(guessFileNameFromUrl('https://cdn.example/a/%E4%B8%AD%E6%96%87.png?x=1')).toBe(
            '中文.png',
        );
        expect(guessFileNameFromUrl('https://cdn.example/plain.bin')).toBe('plain.bin');
        expect(guessFileNameFromUrl('https://cdn.example/%ZZ.xlsx')).toBe('%ZZ.xlsx');
    });

    it('loads encoded file URLs from the local filesystem', async () => {
        const filePath = path.join(os.tmpdir(), `snowluma video ${process.pid}-${Date.now()}.txt`);
        fs.writeFileSync(filePath, 'ok');

        try {
            const source = pathToFileURL(filePath).href;
            const loaded = await loadBinarySource(source, 'test file');
            expect(Buffer.from(loaded.bytes).toString('utf8')).toBe('ok');
            expect(loaded.fileName).toBe(path.basename(filePath));
        } finally {
            try {
                fs.unlinkSync(filePath);
            } catch {
                /* ignore */
            }
        }
    });

    it('loads base64 data URLs as inline bytes', async () => {
        const loaded = await loadBinarySource('data:audio/webm;base64,AQID', 'record', 64);

        expect({ bytes: Array.from(loaded.bytes), fileName: loaded.fileName }).toEqual({
            bytes: [1, 2, 3],
            fileName: '',
        });
    });

    it('never classifies data URLs as local file paths', () => {
        expect(resolveLocalFilePath('data:audio/webm;base64,AQID')).toBeNull();
    });

    it('rejects non-base64 data URLs explicitly', async () => {
        await expect(loadBinarySource('data:text/plain,hello', 'record', 64)).rejects.toThrow(
            /data URL source must use base64 encoding/,
        );
    });

    it('requires the RFC 2397 base64 flag instead of a base64 media type', async () => {
        await expect(loadBinarySource('data:base64,AQID', 'record', 64)).rejects.toThrow(
            /data URL source must use base64 encoding/,
        );
    });
});

describe('loadBinarySource maxBytes enforcement', () => {
    const originalFetch = globalThis.fetch;
    afterEach(() => {
        globalThis.fetch = originalFetch;
        vi.restoreAllMocks();
    });

    it('rejects HTTP downloads larger than maxBytes via streaming, even without Content-Length', async () => {
        // Streamed chunk-encoded response: no Content-Length, totals > cap.
        const chunkSize = 4 * 1024;
        const totalChunks = 16;
        const stream = new ReadableStream<Uint8Array>({
            start(controller) {
                for (let i = 0; i < totalChunks; i++) {
                    controller.enqueue(new Uint8Array(chunkSize));
                }

                controller.close();
            },
        });
        globalThis.fetch = vi.fn(
            async () =>
                new Response(stream, {
                    status: 200,
                    headers: {/* no content-length */},
                }),
        ) as typeof fetch;

        // Cap below total: 16*4096 = 65536, cap 32 KiB → should throw mid-stream.
        await expect(
            loadBinarySource('https://example.test/big.bin', 'test', 32 * 1024),
        ).rejects.toThrow(/too large/);
    });

    it('rejects HTTP downloads when Content-Length already exceeds maxBytes', async () => {
        globalThis.fetch = vi.fn(
            async () =>
                new Response(new Uint8Array(0), {
                    status: 200,
                    headers: { 'content-length': String(10 * 1024 * 1024) },
                }),
        ) as typeof fetch;

        await expect(
            loadBinarySource('https://example.test/big.bin', 'test', 1024),
        ).rejects.toThrow(/too large: 10485760/);
    });

    it('accepts a streamed download that fits inside maxBytes', async () => {
        const stream = new ReadableStream<Uint8Array>({
            start(controller) {
                controller.enqueue(new Uint8Array([1, 2, 3]));
                controller.enqueue(new Uint8Array([4, 5]));
                controller.close();
            },
        });
        globalThis.fetch = vi.fn(async () => new Response(stream, { status: 200 })) as typeof fetch;

        const loaded = await loadBinarySource('https://example.test/small.bin', 'test', 1024);
        expect(Array.from(loaded.bytes)).toEqual([1, 2, 3, 4, 5]);
    });

    it('rejects oversized local files via fs.stat before reading them', async () => {
        const filePath = path.join(
            os.tmpdir(),
            `snowluma-binary-cap-${process.pid}-${Date.now()}.bin`,
        );
        fs.writeFileSync(filePath, Buffer.alloc(128));

        try {
            await expect(loadBinarySource(filePath, 'test', 64)).rejects.toThrow(
                /too large: 128 > 64/,
            );
        } finally {
            try {
                fs.unlinkSync(filePath);
            } catch {
                /* ignore */
            }
        }
    });

    it('rejects oversized base64 payloads', async () => {
        const big = Buffer.alloc(128).toString('base64');
        await expect(loadBinarySource(`base64://${big}`, 'test', 64)).rejects.toThrow(
            /too large: 128 > 64/,
        );
    });

    it('rejects oversized base64 data URL payloads', async () => {
        const big = Buffer.alloc(128).toString('base64');
        await expect(loadBinarySource(`data:audio/webm;base64,${big}`, 'test', 64)).rejects.toThrow(
            /too large: 128 > 64/,
        );
    });
});

describe('loadBinarySource HTTP header hardening', () => {
    const originalFetch = globalThis.fetch;
    afterEach(() => {
        globalThis.fetch = originalFetch;
        vi.restoreAllMocks();
    });

    it('sends a browser User-Agent on the first attempt, without a Referer', async () => {
        const calls: Array<Record<string, string>> = [];
        globalThis.fetch = vi.fn(async (_url: unknown, init?: RequestInit) => {
            calls.push((init?.headers ?? {}) as Record<string, string>);
            return new Response(new Uint8Array([1, 2, 3]), { status: 200 });
        }) as typeof fetch;

        await loadBinarySource('https://example.test/a.png', 'image');
        expect(calls).toHaveLength(1);
        expect(calls[0]['User-Agent']).toMatch(/Mozilla\/5\.0/);
        expect(calls[0]['Referer']).toBeUndefined();
    });

    it('retries with a Referer when the first fetch fails at the network level', async () => {
        // Reproduces the reported bug: an anti-bot front-end resets the
        // header-less request → undici `TypeError: fetch failed`. The retry
        // carries a Referer pointing at the resource itself and succeeds.
        const calls: Array<Record<string, string>> = [];
        globalThis.fetch = vi.fn(async (_url: unknown, init?: RequestInit) => {
            calls.push((init?.headers ?? {}) as Record<string, string>);

            if (calls.length === 1) {
                throw new TypeError('fetch failed');
            }

            return new Response(new Uint8Array([9, 9]), { status: 200 });
        }) as typeof fetch;

        const loaded = await loadBinarySource('https://img.example.test/x.gif', 'image');
        expect(Array.from(loaded.bytes)).toEqual([9, 9]);
        expect(calls).toHaveLength(2);
        expect(calls[0]['Referer']).toBeUndefined();
        expect(calls[1]['Referer']).toBe('https://img.example.test/x.gif');
    });

    it('retries with a Referer on a 403 (anti-hotlink)', async () => {
        let n = 0;
        globalThis.fetch = vi.fn(async () => {
            n++;

            if (n === 1) {
                return new Response(new Uint8Array(0), { status: 403 });
            }

            return new Response(new Uint8Array([7]), { status: 200 });
        }) as typeof fetch;

        const loaded = await loadBinarySource('https://cdn.example.test/y.jpg', 'image');
        expect(Array.from(loaded.bytes)).toEqual([7]);
        expect(n).toBe(2);
    });

    it('does not retry a size-limit rejection (deterministic, no second download)', async () => {
        const fetchMock = vi.fn(
            async () =>
                new Response(new Uint8Array(0), {
                    status: 200,
                    headers: { 'content-length': String(10 * 1024 * 1024) },
                }),
        );
        globalThis.fetch = fetchMock as typeof fetch;

        await expect(
            loadBinarySource('https://example.test/big.bin', 'image', 1024),
        ).rejects.toThrow(/too large/);
        expect(fetchMock).toHaveBeenCalledTimes(1);
    });

    it('surfaces the first error when the Referer retry also fails', async () => {
        let n = 0;
        globalThis.fetch = vi.fn(async () => {
            n++;
            throw new TypeError('fetch failed');
        }) as typeof fetch;

        await expect(loadBinarySource('https://example.test/z.png', 'image')).rejects.toThrow(
            /fetch failed/,
        );
        expect(n).toBe(2);
    });
});