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 },
        status: { players: 0, map: 'zm_transit', gametype: null, roster: [] } }))
}));

let fixture: Fixture;
let hostId: string;
let agentCredential: string;
let heartbeatInventory: Record<string, unknown>;
let releasePlacement: (() => void) | undefined;
const image = 'example.test/plutainer:test';

beforeEach(async () => {
    vi.resetModules(); vi.clearAllMocks();
    releasePlacement = undefined;
    fixture = await newFixture([]);
    vi.stubEnv('GAME_FILES_ROOT', join(fixture.root, 'libraries'));
    vi.stubEnv('PLUTAINER_IMAGE', image);
    vi.stubEnv('RCON_PASSWORD', 'test-password');

    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]
    };
    agentCredential = enrollHost(createEnrollment(hostId).token, inventory).credential;
    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) })));
    heartbeatInventory = { ...inventory, libraries };
    heartbeat(hostId, heartbeatInventory);
    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,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 () => {
    releasePlacement?.();
    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('places queued creations and completes all exact removals during later worker passes', async () => {
        const { db } = await import('../../src/lib/server/db/index.js');
        const { fleetSettings, saveFleetSettings } = await import('../../src/lib/server/settings.js');
        saveFleetSettings({ ...fleetSettings(), createConcurrency: 10, destroyConcurrency: 9 });
        const { saveBlueprint } = await import('../../src/lib/server/fleet/launch-recipes.js');
        const { previewCollection, queueCollection, getCollection } = await import('../../src/lib/server/fleet/collections.js');
        const { T5_ZOMBIE_MAPS } = await import('../../src/lib/map-aliases.js');
        const blueprint = saveBlueprint({ name: 'Replace nine with ten', entries: T5_ZOMBIE_MAPS
            .map(map => ({ game: 't5', mapSlug: map.slug, count: 1 })) });
        const preview = previewCollection(blueprint.id, 'exact');
        const queued = queueCollection({ previewId: preview.id,
            keys: Object.fromEntries(preview.servers.map(server => [server.name!, `key-${server.name}`])) });
        expect(queueCollection({ previewId: preview.id })).toEqual(queued);
        expect(db().prepare('SELECT id FROM native_instances').all()).toHaveLength(9);
        expect(db().prepare('SELECT instance_id FROM ec_host_ports').all()).toHaveLength(18);

        const { processProvisioning } = await import('../../src/lib/server/provisioning/worker.js');
        await processProvisioning();
        const operations = db().prepare("SELECT id,kind FROM ec_host_operations WHERE kind IN ('instance.create','instance.remove')")
            .all() as { id: string; kind: string }[];
        expect(operations.filter(operation => operation.kind === 'instance.create')).toHaveLength(10);
        const removals = operations.filter(operation => operation.kind === 'instance.remove');
        expect(removals).toHaveLength(9);
        const { reportHostOperationStatus } = await import('../../src/lib/server/hosts/index.js');
        for (const operation of removals) reportHostOperationStatus(hostId, operation.id, { state: 'completed', result: { exists: false } });
        await processProvisioning();
        const active = db().prepare('SELECT id,port FROM native_instances WHERE retired_at IS NULL').all() as { id: string; port: number }[];
        expect(active).toHaveLength(10);
        expect(new Set(active.map(instance => instance.port)).size).toBe(10);
        for (const instance of active) expect(db().prepare('SELECT protocol,port FROM ec_host_ports WHERE instance_id=? ORDER BY protocol').all(instance.id))
            .toEqual([{ protocol: 'tcp', port: instance.port }, { protocol: 'udp', port: instance.port }]);
        expect(db().prepare('SELECT instance_id FROM ec_host_ports').all()).toHaveLength(20);
        expect(getCollection(queued.collectionId!)?.servers.filter(server => server.action === 'destroy').map(server => server.state))
            .toEqual(Array(9).fill('done'));
        expect(db().prepare("SELECT id FROM ec_host_operations WHERE kind IN ('instance.create','instance.remove')").all()).toHaveLength(19);
    });

    it('accepts nine removals and ten unplaced creations before capacity checks or file loading', 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 { load } = await import('../../src/routes/collections/launches/[id]/+page.server.js');
        const { GET: collectionResponse } = await import('../../src/routes/api/deployment-collections/[id]/+server.js');
        const { GET: fleetResponse } = await import('../../src/routes/api/servers/+server.js');
        const { POST: agentHeartbeat } = await import('../../src/routes/api/agent/heartbeat/+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
            .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 capacity = await import('../../src/lib/server/hosts/capacity.js');
        const placement = vi.spyOn(capacity, 'choosePlacement').mockImplementation(() => {
            throw new Error('Placement is waiting for fresh host capacity');
        });
        const preparation = await import('../../src/lib/server/provisioning/launch-preparation.js');
        const evaluate = preparation.evaluateNativePlacement;
        let placementStarted!: () => void;
        const started = new Promise<void>(resolve => { placementStarted = resolve; });
        const gate = new Promise<void>(resolve => { releasePlacement = resolve; });
        const evaluation = vi.spyOn(preparation, 'evaluateNativePlacement').mockImplementation(async options => {
            placementStarted();
            await gate;
            return evaluate(options);
        });
        const scripts = await import('../../src/lib/server/fleet/scripts.js');
        const fullVersion = vi.spyOn(scripts, 'getVersion');

        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);
        expect(load({ params: { id: body.collectionId } })).toEqual({});
        // 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(placement).not.toHaveBeenCalled();
        expect(evaluation).not.toHaveBeenCalled();
        expect(fullVersion).not.toHaveBeenCalled();
        expect(db().prepare("SELECT id FROM ec_host_operations WHERE kind='instance.create'").all()).toEqual([]);
        expect(db().prepare('SELECT id FROM native_instances').all()).toHaveLength(9);
        expect(db().prepare('SELECT instance_id FROM ec_host_ports').all()).toHaveLength(18);
        expect(db().prepare('SELECT deployment_id FROM native_creation_intents').all()).toHaveLength(10);
        expect(db().prepare('SELECT id FROM server_launch_previews').all()).toEqual([]);
        const rows = db().prepare('SELECT length(recipe) AS bytes FROM server_launch_recipes').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);
        const { nativeDeployment } = await import('../../src/lib/server/backends/native.js');
        for (const server of collection.servers.filter(server => server.action === 'create')) {
            expect(nativeDeployment(server.id)).toBe(true);
            expect(getDeployment(server.id)?.backend).toBe('native');
        }

        await new Promise<void>(resolve => setImmediate(resolve));
        await processProvisioning({ wait: false });
        await started;
        expect(evaluation).toHaveBeenCalled();
        expect(placement).not.toHaveBeenCalled();
        expect(db().prepare("SELECT id FROM ec_host_operations WHERE kind='instance.create'").all()).toEqual([]);
        expect(getCollection(body.collectionId)?.collection.total).toBe(19);
        const collectionPage = collectionResponse({ params: { id: body.collectionId } });
        expect(collectionPage.status).toBe(200);
        expect((await collectionPage.json()).servers).toHaveLength(19);
        const fleet = fleetResponse();
        expect(fleet.status).toBe(200);
        expect((await fleet.json()).servers).toHaveLength(9);
        const heartbeatResponse = await agentHeartbeat({ request: new Request('https://controller.test/api/agent/heartbeat', {
            method: 'POST', headers: { authorization: `Bearer ${agentCredential}` }, body: JSON.stringify({ inventory: heartbeatInventory })
        }) });
        expect(heartbeatResponse.status).toBe(200);
        expect(await heartbeatResponse.json()).toMatchObject({ host: { id: hostId, connected: true }, heartbeatSeconds: 15 });
        // All three endpoints complete while the background placement is still paused.
        expect(placement).not.toHaveBeenCalled();
        expect(db().prepare("SELECT id FROM ec_host_operations WHERE kind='instance.create'").all()).toEqual([]);
        placement.mockRestore(); fullVersion.mockRestore();
        releasePlacement!();
        await processProvisioning();
        const dispatched = db().prepare(`SELECT n.deployment_id,o.id 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; id: string }[];
        expect(dispatched).toHaveLength(1);
        const { getHostOperation } = await import('../../src/lib/server/hosts/index.js');
        const payload = getHostOperation(dispatched[0].id)!.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);
});