import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
import { newFixture, type Fixture } from '../helpers/fixture.js';

const now = Date.parse('2026-10-05T16:00:00Z');
const day = 86_400_000;
const at = (age: number) => new Date(now - age).toISOString();
const inventory = { protocolVersion: 1, dockerRunning: true, directoriesWritable: true,
    storageAvailable: 100 * 1024 ** 3, runtimeImages: ['plutainer:test'], libraries: [{ id: 'library', state: 'ready' }] };
let fixture: Fixture;

beforeEach(async () => {
    vi.resetModules(); fixture = await newFixture([]);
    vi.useFakeTimers({ toFake: ['Date'] }); vi.setSystemTime(now);
});
afterEach(async () => { vi.useRealTimers(); vi.restoreAllMocks(); await fixture.cleanup(); });

async function setup() {
    const hosts = await import('../../src/lib/server/hosts/index.js');
    const { db, closeDb } = await import('../../src/lib/server/db/index.js');
    const { fleetSettings, saveFleetSettings } = await import('../../src/lib/server/settings.js');
    const host = hosts.createHost({ name: 'Retention host' });
    const credentials = hosts.enrollHost(hosts.createEnrollment(host.id).token, inventory);
    const handle = db();
    function add(kind: string, options: { state?: string; payload?: Record<string, unknown>; result?: unknown;
        error?: string; age?: number; serialized?: boolean; routing?: Record<string, unknown> } = {}) {
        const payload = options.payload ?? {};
        const operation = options.serialized
            ? hosts.queueHostOperationSerialized(host.id, kind, Buffer.from(JSON.stringify(payload)), {}, options.routing ?? {})
            : hosts.queueHostOperation(host.id, kind, payload);
        const state = options.state ?? 'completed';
        if (state !== 'pending') hosts.reportHostOperationStatus(host.id, operation.id, {
            state, result: options.result === undefined ? { ok: true } : options.result, error: options.error
        });
        handle.prepare('UPDATE ec_host_operations SET created_at=?,updated_at=? WHERE id=?')
            .run(at(10 * day), at(options.age ?? 2 * day), operation.id);
        return operation.id;
    }
    return { ...hosts, handle, db, closeDb, host, credentials, fleetSettings, saveFleetSettings, add };
}

describe('routine host observation retention', () => {
    it('removes aged successful reads, manifests, and read-only RCON while retaining failures, actions, and recent evidence', async () => {
        const api = await setup();
        const removed = ['host.inspect', 'instance.inspect', 'files.read', 'files.stat', 'files.list', 'files.manifest', 'logs.read']
            .map(kind => api.add(kind));
        removed.push(...['status', 'getstatus', 'version'].map(command => api.add('rcon.execute', { payload: { command } })));
        const retained = [
            ...['pending', 'accepted', 'running', 'failed', 'unknown'].map(state => api.add('files.read', { state })),
            ...['instance.restart', 'instance.stop', 'instance.remove', 'files.stage', 'files.activate', 'files.rollback', 'runtime.pull', 'unknown.read']
                .map(kind => api.add(kind)),
            api.add('rcon.execute', { payload: { command: 'map_restart' } }),
            api.add('rcon.execute', { payload: { command: 'status; map_restart' } }),
            api.add('rcon.execute', { payload: { command: 'status' }, result: { ok: false, reason: 'timeout' } }),
            api.add('instance.inspect', { result: { healthy: false, state: 'stopped' } }),
            api.add('files.read', { error: 'Read failed' }),
            api.add('files.read', { result: { error: 'Read failed' } }),
            api.add('files.stat', { age: day }),
            api.add('files.read', { age: day - 1 })
        ];
        expect(api.pruneHostObservations()).toBe(removed.length);
        const ids = (api.handle.prepare('SELECT id FROM ec_host_operations').all() as { id: string }[]).map(row => row.id);
        expect(ids.sort()).toEqual(retained.sort());
        expect(api.pruneHostObservations()).toBe(0);
    });

    it('classifies full serialized RCON payloads and deletes their events and immutable bytes together', async () => {
        const api = await setup();
        const read = api.add('rcon.execute', { serialized: true, payload: { command: 'status' }, routing: { command: 'map_restart' } });
        const action = api.add('rcon.execute', { serialized: true, payload: { command: 'map_restart' }, routing: { command: 'status' } });
        expect(api.handle.prepare('SELECT COUNT(*) AS count FROM ec_host_operation_payloads').get()).toEqual({ count: 2 });
        expect(api.pruneHostObservations()).toBe(1);
        expect(api.getHostOperationStatus(read)).toBeNull();
        expect(api.getHostOperation(action)?.payload).toEqual({ command: 'map_restart' });
        expect(api.handle.prepare('SELECT DISTINCT operation_id FROM ec_host_operation_events').all()).toEqual([{ operation_id: action }]);
        expect(api.handle.prepare('SELECT operation_id FROM ec_host_operation_payloads').all()).toEqual([{ operation_id: action }]);
        expect(api.handle.pragma('foreign_key_check')).toEqual([]);
    });

    it('honors disabled retention and changes to the saved period using the last receipt time', async () => {
        const api = await setup();
        const old = api.add('files.read', { age: 4 * day });
        const recentReceipt = api.add('files.read', { age: 2 * day });
        api.saveFleetSettings({ ...api.fleetSettings(), observationKeepDays: 0 });
        expect(api.pruneHostObservations()).toBe(0);
        api.saveFleetSettings({ ...api.fleetSettings(), observationKeepDays: 3 });
        expect(api.pruneHostObservations()).toBe(1);
        expect(api.getHostOperationStatus(old)).toBeNull();
        expect(api.getHostOperationStatus(recentReceipt)).not.toBeNull();
        api.saveFleetSettings({ ...api.fleetSettings(), observationKeepDays: 1 });
        expect(api.pruneHostObservations()).toBe(1);
    });

    it('bounds each cleanup batch and seeks through the retention index despite extensive retained action history', async () => {
        const api = await setup();
        api.handle.transaction(() => {
            const insert = api.handle.prepare(`INSERT INTO ec_host_operations
                (id,host_id,kind,payload,state,created_at,updated_at,observation_success)
                VALUES(?,?,?,'{}','completed',?,?,?)`);
            for (let index = 0; index < 2000; index++) insert.run(`action-${index}`, api.host.id, 'instance.restart', at(10 * day), at(10 * day), 0);
            for (let index = 0; index < 503; index++) insert.run(`read-${index}`, api.host.id, 'files.read', at(2 * day), at(2 * day), 1);
        })();
        const prepare = vi.spyOn(api.handle, 'prepare');
        expect(api.pruneHostObservations()).toBe(500);
        const query = prepare.mock.calls.map(([sql]) => sql).find(sql => sql.includes('SELECT id FROM ec_host_operations WHERE observation_success'))!;
        prepare.mockRestore();
        const plan = api.handle.prepare(`EXPLAIN QUERY PLAN ${query}`).all(at(day)) as { detail: string }[];
        expect(plan.some(row => row.detail.includes('USING INDEX ec_host_operations_observation_retention'))).toBe(true);
        expect(plan.some(row => row.detail.includes('TEMP B-TREE'))).toBe(false);
        expect(api.pruneHostObservations()).toBe(3);
        expect(api.pruneHostObservations()).toBe(0);
        expect(api.handle.prepare("SELECT COUNT(*) AS count FROM ec_host_operations WHERE kind='instance.restart'").get()).toEqual({ count: 2000 });
    });

    it('backfills legacy observation classification once while preserving actions and negative or invalid results', async () => {
        const api = await setup();
        const read = api.add('files.manifest');
        const serializedRead = api.add('rcon.execute', { serialized: true, payload: { command: 'status' } });
        const retained = [api.add('instance.restart'), api.add('rcon.execute', { payload: { command: 'map_restart' } }),
            api.add('instance.inspect', { result: { healthy: false } }), api.add('files.read', { result: { ok: false } }),
            api.add('files.read', { error: 'Unavailable' }), api.add('files.read', { result: { error: 'Unavailable' } }),
            api.add('files.stat', { state: 'unknown' })];
        const malformed = api.add('files.read');
        api.handle.prepare('UPDATE ec_host_operations SET result=? WHERE id=?').run('{not-json', malformed);
        retained.push(malformed);
        api.handle.exec('DROP INDEX ec_host_operations_observation_retention');
        api.handle.exec('ALTER TABLE ec_host_operations DROP COLUMN observation_success');
        api.closeDb();

        expect(api.pruneHostObservations()).toBe(2);
        expect(api.getHostOperationStatus(read)).toBeNull();
        expect(api.getHostOperationStatus(serializedRead)).toBeNull();
        const handle = api.db();
        expect((handle.prepare('SELECT id FROM ec_host_operations').all() as { id: string }[]).map(row => row.id).sort()).toEqual(retained.sort());
        // Subsequent boots honor the recorded classification instead of repeatedly
        // deriving it from historical rows that were deliberately preserved.
        handle.prepare("UPDATE ec_host_operations SET result='{}' WHERE id=?").run(malformed);
        api.closeDb();
        expect(api.pruneHostObservations()).toBe(0);
        expect(api.getHostOperationStatus(malformed)).not.toBeNull();
    });

    it('returns the current shared retention setting to an agent on every heartbeat', async () => {
        const api = await setup();
        const { POST } = await import('../../src/routes/api/agent/heartbeat/+server.js');
        for (const observationKeepDays of [7, 0]) {
            api.saveFleetSettings({ ...api.fleetSettings(), observationKeepDays });
            const response = await POST({ request: new Request('https://ec.test/api/agent/heartbeat', {
                method: 'POST', headers: { authorization: `Bearer ${api.credentials.credential}`, 'Content-Type': 'application/json' },
                body: JSON.stringify({ inventory })
            }) });
            expect(response.status).toBe(200);
            expect(await response.json()).toMatchObject({ observationKeepDays, heartbeatSeconds: 15 });
        }
    });
});