import { randomUUID } from 'node:crypto';
import { join } from 'node:path';
import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
import { newFixture, type Fixture } from '../helpers/fixture.js';

vi.mock('../../src/lib/server/integrations/rcon.js', () => ({
    rconGetPlayerCount: vi.fn(async () => 0),
    rconPlutoniumVersion: vi.fn(async () => ({ revision: 5354, error: null })),
    rconStatusResult: vi.fn(async () => ({ ok: true, endpoint: { host: 'agent', port: 28960 }, rawReply: '',
        status: { players: 0, map: 'zm_transit', gametype: null, roster: [] } }))
}));

let fixture: Fixture;
let hostId: string;
const image = 'example.test/plutainer:test';

beforeEach(async () => {
    vi.resetModules(); vi.clearAllMocks();
    fixture = await newFixture([]);
    vi.stubEnv('GAME_FILES_ROOT', join(fixture.root, 'libraries'));
    vi.stubEnv('PLUTAINER_IMAGE', image);
    vi.stubEnv('RCON_PASSWORD', 'test-password');
    vi.stubEnv('KOMODO_ADDRESS', '');
    vi.stubEnv('KOMODO_API_KEY', '');
    vi.stubEnv('KOMODO_API_SECRET', '');
    vi.stubGlobal('fetch', vi.fn(async () => Response.json({ product: 'plutonium-core-prod', revision: 5354, files: [] })));
    const { createHost, createEnrollment, enrollHost, heartbeat, reserveHostPort } = await import('../../src/lib/server/hosts/index.js');
    hostId = createHost({ name: 'Match collection host', portMin: 28960, portMax: 28999 }).id;
    const inventory = {
        cpuCount: 64, cpuUsagePercent: 5, memoryTotal: 128 * 1024 ** 3, memoryAvailable: 120 * 1024 ** 3,
        protocolVersion: 1, dockerRunning: true, directoriesWritable: true,
        storageAvailable: 1_000_000_000_000, runtimeImages: [image]
    };
    enrollHost(createEnrollment(hostId).token, inventory);
    const { createLibraryImport, updateHostLibraryCaches } = await import('../../src/lib/server/game-files/index.js');
    const { db } = await import('../../src/lib/server/db/index.js');
    const libraries = ['t5', 't6'].map(game => {
        const id = createLibraryImport({ hostId, game }).id;
        db().prepare("UPDATE game_file_versions SET state='ready',manifest='[]',manifest_sha256=?,size_bytes=1,published_at=? WHERE id=?")
            .run('a'.repeat(64), new Date().toISOString(), id);
        return { id, state: 'ready' as const };
    });
    updateHostLibraryCaches(hostId, libraries.map(library => ({ libraryVersionId: library.id, status: 'ready', manifestSha256: 'a'.repeat(64) })));
    heartbeat(hostId, { ...inventory, libraries });
    const { T6_ZOMBIE_MAPS } = await import('../../src/lib/map-aliases.js');
    const now = new Date().toISOString();
    db().transaction(() => {
        for (const [index, map] of T6_ZOMBIE_MAPS.slice(0, 9).entries()) {
            const name = `t6_zombie_${map.slug}_1`;
            const instanceId = randomUUID();
            const deploymentId = randomUUID();
            const port = 28960 + index;
            db().prepare(`INSERT INTO servers(name,komodo_name,game,map,game_mode,map_slug,game_port,container_state,last_players,last_seen_at)
                VALUES(?,'','t6',?,'zombie',?,?,'running',0,?)`).run(name, map.canonical, map.slug, port, now);
            db().prepare('INSERT INTO native_instances(id,server,host_id,library_id,image,port,created_at) VALUES(?,?,?,?,?,?,?)')
                .run(instanceId, name, hostId, libraries[1].id, image, port, now);
            db().prepare("INSERT INTO server_deployments(id,server,action,state,stage,triggered_by,started_at,finished_at) VALUES(?,?,'create','done','Verified','fixture',?,?)")
                .run(deploymentId, name, now, now);
            db().prepare('INSERT INTO native_provisioning(deployment_id,instance_id,generation) VALUES(?,?,1)').run(deploymentId, instanceId);
            for (const protocol of ['tcp', 'udp'] as const) reserveHostPort(hostId, instanceId, { port, protocol });
        }
    })();
    const backend = await import('../../src/lib/server/backends/native.js');
    vi.spyOn(backend, 'nativeRequest').mockImplementation(async (_instance, kind) => {
        if (kind !== 'instance.inspect') throw new Error(`Unexpected request ${kind}`);
        return { exists: true, healthy: true, state: 'running' } as never;
    });
});

afterEach(async () => {
    await new Promise<void>(resolve => setImmediate(resolve));
    const { processProvisioning } = await import('../../src/lib/server/provisioning/worker.js');
    await processProvisioning();
    await new Promise<void>(resolve => setImmediate(resolve));
    vi.restoreAllMocks();
    await fixture.cleanup();
    vi.unstubAllEnvs(); vi.unstubAllGlobals();
});

describe('matching a native collection', () => {
    it('admits nine removals and ten creations without copying plugin bytes into every queued launch', async () => {
        const { db } = await import('../../src/lib/server/db/index.js');
        const { createScript, setScope, deleteScript } = await import('../../src/lib/server/fleet/scripts.js');
        const content = Buffer.alloc(8 * 1024 ** 2, 42);
        const { script, version } = createScript({ name: 'Promoted plugin', kind: 'plugin', targetRelPath: 'fixture.dll',
            scopeType: 'game', scopeValue: 't5', content });
        db().prepare('UPDATE scripts SET current_version_id=? WHERE id=?').run(version.id, script.id);
        const { saveBlueprint, recipeForDeployment } = await import('../../src/lib/server/fleet/launch-recipes.js');
        const { previewCollection, getCollection } = await import('../../src/lib/server/fleet/collections.js');
        const { getDeployment } = await import('../../src/lib/server/fleet/deployments.js');
        const { nativeRequest } = await import('../../src/lib/server/backends/native.js');
        const { processProvisioning } = await import('../../src/lib/server/provisioning/worker.js');
        const { POST } = await import('../../src/routes/api/deployment-collections/+server.js');
        const { T5_ZOMBIE_MAPS } = await import('../../src/lib/map-aliases.js');
        const blueprint = saveBlueprint({ name: 'Match ten T5 lobbies', entries: T5_ZOMBIE_MAPS.filter(map => map.slug !== 'zombietron')
            .map(map => ({ game: 't5', mapSlug: map.slug, count: 1 })) });
        const preview = previewCollection(blueprint.id, 'exact');
        expect(preview).toMatchObject({ ready: true, mode: 'exact' });
        expect(preview.removals).toHaveLength(9);
        expect(preview.servers).toHaveLength(10);
        const storedPreview = db().prepare('SELECT length(entries) AS bytes FROM server_collection_previews WHERE id=?')
            .get(preview.id) as { bytes: number };
        expect(storedPreview.bytes).toBeLessThan(100_000);

        const submit = (keys?: Record<string, string>) => POST({ request: new Request('http://localhost/api/deployment-collections', {
            method: 'POST', body: JSON.stringify({ previewId: preview.id, keys }) }) });
        const response = await submit(Object.fromEntries(preview.servers.map(server => [server.name!, `key-${server.name}`])));
        const body = await response.json();
        expect(response.status).toBe(202);
        expect(body).toMatchObject({ ok: true, collectionId: expect.any(String) });
        expect(await (await submit()).json()).toEqual(body);
        // Exercise the real route and worker: admission must return before
        // loading launch payloads or inspecting the nine servers to remove.
        expect(nativeRequest).not.toHaveBeenCalled();
        expect(db().prepare("SELECT id FROM ec_host_operations WHERE kind='instance.create'").all()).toEqual([]);
        for (const table of ['server_launch_previews', 'server_launch_recipes']) {
            const rows = db().prepare(`SELECT length(recipe) AS bytes FROM ${table}`).all() as { bytes: number }[];
            expect(rows).toHaveLength(10);
            expect(rows.every(row => row.bytes < 10_000)).toBe(true);
        }
        const collection = getCollection(body.collectionId)!;
        expect(collection.collection).toMatchObject({ mode: 'exact', total: 19 });
        expect(collection.servers.filter(server => server.action === 'destroy')).toHaveLength(9);
        expect(collection.servers.filter(server => server.action === 'create')).toHaveLength(10);

        await new Promise<void>(resolve => setImmediate(resolve));
        await processProvisioning();
        const dispatched = db().prepare(`SELECT n.deployment_id,o.payload FROM native_provisioning n
            JOIN ec_host_operations o ON o.id=n.operation_id WHERE o.kind='instance.create'`).all() as { deployment_id: string; payload: string }[];
        expect(dispatched).toHaveLength(1);
        const payload = JSON.parse(dispatched[0].payload) as { files: { path: string; contentBase64: string; sha256: string }[] };
        expect(payload.files.find(file => file.path.endsWith('/fixture.dll'))).toMatchObject({
            sha256: version.sha256, contentBase64: content.toString('base64')
        });

        // Queued plans are descriptions, while an attempted launch preserves
        // its exact bytes even after the promoted artifact is deleted.
        setScope({ scriptId: script.id, scopeType: null, scopeValue: null });
        deleteScript(script.id);
        const queued = collection.servers.find(server => server.action === 'create' && server.id !== dispatched[0].deployment_id)!;
        expect(getDeployment(queued.id)?.recipe?.files).toContainEqual(expect.objectContaining({ path: 'fixture.dll', versionId: version.id, size: content.length }));
        const attempted = recipeForDeployment(dispatched[0].deployment_id)!.recipe.files.find(file => file.path === 'fixture.dll');
        expect(attempted).toMatchObject({ sha256: version.sha256, content: content.toString('base64') });
    }, 30_000);
});