import { createHash } from 'node:crypto';
import type Database from 'better-sqlite3';
import { zombieMapBySlug } from '../src/lib/map-aliases.js';

export const FIXTURE_KEY = 'development_fixture_v1';
export const FIXTURE_VERSION = 'electric-cherry-ui-v1';
const MINUTE = 60_000;
const DAY = 24 * 60 * MINUTE;
const GIB = 1024 ** 3;
const image = 'fixture.invalid/electric-cherry/preview:local';

type Scenario = { game: 't5' | 't6'; slug: string; players: number; round: number; minutes: number; state: 'active' | 'idle' | 'stopped' | 'stale' | 'starting' | 'host-offline' };
const scenarios: Scenario[] = [
    { game: 't5', slug: 'theater', players: 4, round: 27, minutes: 76, state: 'active' },
    { game: 't5', slug: 'cosmodrome', players: 2, round: 16, minutes: 39, state: 'active' },
    { game: 't5', slug: 'moon', players: 0, round: 0, minutes: 0, state: 'idle' },
    { game: 't5', slug: 'temple', players: 3, round: 32, minutes: 84, state: 'active' },
    { game: 't5', slug: 'pentagon', players: 0, round: 0, minutes: 0, state: 'stopped' },
    { game: 't5', slug: 'coast', players: 0, round: 0, minutes: 0, state: 'stale' },
    { game: 't6', slug: 'tomb', players: 3, round: 22, minutes: 58, state: 'active' },
    { game: 't6', slug: 'town', players: 2, round: 12, minutes: 23, state: 'active' },
    { game: 't6', slug: 'buried', players: 0, round: 0, minutes: 0, state: 'idle' },
    { game: 't6', slug: 'prison', players: 4, round: 41, minutes: 119, state: 'active' },
    { game: 't6', slug: 'nuked', players: 0, round: 0, minutes: 0, state: 'starting' },
    { game: 't6', slug: 'highrise', players: 0, round: 0, minutes: 0, state: 'host-offline' }
];

export const fixtureServers = scenarios.map((scenario, index) => ({ ...scenario,
    name: `${scenario.game}_zombie_${scenario.slug}_1`, host: `fixture-host-${index === 11 ? 3 : index % 2 + 1}`,
    instance: `fixture-instance-${index + 1}`, port: 28960 + index,
    map: zombieMapBySlug(scenario.game, scenario.slug)!
}));
const names = ['Jamie Cross', 'Alex', 'Sam', 'Morgan', 'Riley', 'Taylor', 'Jordan', 'Casey', 'Quinn', 'Avery', 'Drew', 'Kai'];
const iso = (at: number) => new Date(at).toISOString();
const player = (index: number) => ({ guid: index === 0 ? 'fixture-jamie' : `fixture-player-${index}`,
    name: index === 0 ? names[0] : `${names[index % names.length]} ${Math.floor(index / names.length) + 1}` });
const rosterFor = (server: typeof fixtureServers[number], index: number) => Array.from({ length: server.players }, (_, slot) => ({ ...player(slot === 0 ? 0 : index * 4 + slot),
    ping: 29 + slot * 7, kills: (slot + 1) * 137, headshots: (slot + 1) * 41, downs: slot % 2, revives: slot, score: (slot + 1) * 4100 }));
const seenAt = (server: Scenario, now: number) => iso(now - (['stopped', 'host-offline'].includes(server.state) ? 15 * MINUTE : server.state === 'stale' ? 105_000 : 0));
const containerState = (server: Scenario) => server.state === 'stopped' ? 'exited' : server.state === 'starting' ? 'starting' : 'running';
const instanceStates = (host: string, now: number) => fixtureServers.filter(server => server.host === host).map(server => ({
    instanceId: server.instance, generation: 1, state: containerState(server), healthy: !['stopped', 'starting'].includes(server.state),
    observedAt: iso(now - (host === 'fixture-host-3' ? 10 * MINUTE : 0))
}));

/** Uses only a caller-owned, fully migrated database. No host or worker code is imported. */
export function seedFixtureData(handle: Database.Database, now: number): void {
    if (!Number.isFinite(now)) throw new Error('Invalid fixture time.');
    const occupied = ['servers', 'leaderboard_matches', 'ec_hosts', 'auth_users', 'scripts', 'server_deployments', 'deployments', 'betas', 'game_file_libraries']
        .some(table => handle.prepare(`SELECT 1 FROM ${table} LIMIT 1`).get());
    if (occupied || handle.prepare('SELECT 1 FROM settings WHERE key=?').get(FIXTURE_KEY)) throw new Error('Fixture seeding requires a new database.');
    const insert = (table: string, values: Record<string, unknown>) => {
        const keys = Object.keys(values);
        handle.prepare(`INSERT INTO ${table} (${keys.join(',')}) VALUES (${keys.map(() => '?').join(',')})`).run(...Object.values(values));
    };
    const started = iso(now - 30 * DAY);
    const rememberPlayer = handle.prepare(`INSERT INTO leaderboard_players(game,guid,name,first_seen_at,last_seen_at) VALUES(?,?,?,?,?)
        ON CONFLICT(game,guid) DO UPDATE SET first_seen_at=MIN(first_seen_at,excluded.first_seen_at),last_seen_at=MAX(last_seen_at,excluded.last_seen_at)`);
    handle.transaction(() => {
        insert('settings', { key: FIXTURE_KEY, value: FIXTURE_VERSION });
        // Preview observations must never opt into automatic lifecycle changes.
        for (const [key, value] of Object.entries({ maintenance_paused: '1', maintenance_health: '0', maintenance_drift: '0', maintenance_updates: '0', watchdog_enabled: '0', autoscaling_paused: '1' })) {
            handle.prepare('INSERT INTO settings(key,value) VALUES(?,?) ON CONFLICT(key) DO UPDATE SET value=excluded.value').run(key, value);
        }
        for (const [index, name] of ['Chicago · Primary', 'Dallas · Overflow', 'Frankfurt · Europe'].entries()) {
            const id = `fixture-host-${index + 1}`;
            insert('ec_hosts', { id, name, hostname: `host-${index + 1}.fixture.invalid`, created_at: started, enrolled_at: started,
                last_heartbeat: iso(now - (index === 2 ? 10 * MINUTE : 0)), inventory: JSON.stringify({ protocolVersion: 1, agentVersion: '1.7.0', cpuCount: 16,
                    cpuUsagePercent: 24 + index * 9, memoryTotal: 32 * GIB, memoryAvailable: (20 - index * 3) * GIB,
                    storageTotal: 500 * GIB, storageAvailable: 240 * GIB, dockerRunning: true, directoriesWritable: true,
                    runtimeImages: [image], libraries: [{ id: 'fixture-t5', state: 'ready' }, { id: 'fixture-t6', state: 'ready' }],
                    capabilities: ['instance.heartbeat-state'], instanceStates: instanceStates(id, now) }) });
            // Deliberately not a token hash; no bearer token can authenticate as these agents.
            insert('ec_host_credentials', { id: `fixture-credential-${index + 1}`, host_id: id, token_hash: `invalid-fixture-${index + 1}`, created_at: started });
            for (let minute = 0; minute < 7 * 1440; minute += 15) {
                insert('ec_host_resource_samples', { host_id: id, sampled_at: iso(now - minute * MINUTE), cpu_count: 16,
                    cpu_usage_percent: 28 + index * 6 + 10 * Math.sin(minute / 95), memory_total: 32 * GIB,
                    memory_available: Math.round((18 - index * 2 + Math.sin(minute / 110)) * GIB) });
            }
        }
        let liveId = 495;
        for (const [index, server] of fixtureServers.entries()) {
            const beginning = iso(now - server.minutes * MINUTE - 12_000);
            const roster = rosterFor(server, index);
            insert('servers', { name: server.name, game: server.game, map: server.map.canonical, map_slug: server.slug, game_mode: 'zombie',
                game_port: server.port, game_id: server.game === 't5' ? 't5sp' : 't6zm', image,
                created_by: 'development fixture', created_at: started, last_players: server.players, last_map: server.map.canonical, last_gametype: 'zclassic',
                last_roster: JSON.stringify(roster), last_seen_at: seenAt(server, now),
                last_checked_at: iso(now), last_error: server.state === 'stale' ? 'timeout: no reply from game server' : null,
                rcon_failures: server.state === 'stale' ? 2 : 0,
                container_state: containerState(server),
                container_checked_at: iso(now), desired_state: server.state === 'stopped' ? 'stopped' : 'running',
                active_since: server.players ? beginning : null, inactive_since: server.players ? null : iso(now - 5 * MINUTE),
                game_started_at: server.players ? beginning : null });
            insert('native_instances', { id: server.instance, server: server.name, host_id: server.host,
                library_id: `fixture-${server.game}`, image, port: server.port, created_at: started });
            insert('plutonium_versions', { server: server.name, revision: 4878, checked_at: iso(now), error: null });
            if (server.state === 'active' || server.state === 'idle') {
                const matchId = server.players ? liveId++ : null;
                const payload = { server: server.name, map: server.map.canonical, event: 'heartbeat', round: server.round, players: roster, receivedAt: iso(now),
                    timing: { matchId, players: Object.fromEntries(roster.map(p => [p.guid, { serverJoinedAt: beginning, matchJoinedAt: beginning, roundStarted: 1 }])) } };
                insert('server_telemetry', { server: server.name, round: server.round, players: server.players, received_at: iso(now), payload: JSON.stringify(payload) });
                if (matchId !== null) {
                    insert('leaderboard_matches', { id: matchId, server: server.name, game: server.game, map: server.map.canonical,
                        map_key: server.slug, map_name: server.map.friendly, started_at: beginning, last_received_at: iso(now), status: 'active',
                        start_observed: 1, start_players: server.players, highest_round: server.round, last_event: 'heartbeat', last_fingerprint: `fixture-live-${index}` });
                    for (const p of roster) {
                        rememberPlayer.run(server.game, p.guid, p.name, beginning, iso(now));
                        insert('leaderboard_match_players', { match_id: matchId, guid: p.guid, highest_round: server.round, rounds_survived: server.round,
                            kills: p.kills, headshots: p.headshots, downs: p.downs, revives: p.revives, best_score: p.score,
                            last_round: server.round, present: 1, has_stats: 1, completed: 0, first_seen_at: beginning, last_seen_at: iso(now),
                            first_observed_round: 1, present_at_start: 1 });
                    }
                }
            }
            for (const phase of ['startup', 'running']) {
                for (let minute = 0; minute < 60; minute++) insert('ec_instance_resource_samples', {
                    host_id: server.host, instance_id: server.instance, generation: 1, phase, bucket: iso(now - minute * MINUTE),
                    cpu_cores: phase === 'startup' ? 0.7 + index / 40 : 0.25 + index / 50,
                    memory_bytes: Math.round((phase === 'startup' ? 1.1 : 0.7) * GIB) });
            }
        }
        for (let index = 0; index < 494; index++) {
            // A large Kino duo cohort exercises ranking and profile pagination.
            const server = fixtureServers[index < 64 ? 0 : index % fixtureServers.length];
            const squad = index < 64 ? 2 : Math.floor(index / 12) % 4 + 1;
            const unknownStart = index >= 64 && index % 37 === 0;
            const interrupted = index >= 64 && index % 31 === 0;
            const end = now - (180 + index * 37) * MINUTE;
            const beginning = end - (30 + index % 100) * MINUTE;
            const round = 10 + index * 7 % 56;
            insert('leaderboard_matches', { id: index + 1, server: server.name, game: server.game, map: server.map.canonical,
                map_key: server.slug, map_name: server.map.friendly, started_at: iso(beginning), ended_at: iso(end), last_received_at: iso(end),
                status: interrupted ? 'interrupted' : 'completed', start_observed: unknownStart ? 0 : 1, start_players: unknownStart ? null : squad,
                highest_round: round, last_event: interrupted ? 'interrupted' : 'game_end', last_fingerprint: `fixture-match-${index + 1}` });
            for (let slot = 0; slot < squad; slot++) {
                const p = player(slot === 0 ? 0 : (index + slot * 19) % 80 + 1);
                rememberPlayer.run(server.game, p.guid, p.name, iso(beginning), iso(end));
                insert('leaderboard_match_players', { match_id: index + 1, guid: p.guid, highest_round: round, rounds_survived: round - (unknownStart ? 4 : 0),
                    kills: round * 35 + slot * 71, headshots: round * 9, downs: index % 4, revives: slot + index % 3,
                    best_score: round * 2100 + slot * 1000, last_round: round, present: slot > 0 && index % 9 === 0 ? 0 : 1, has_stats: 1,
                    completed: !interrupted && !(slot > 0 && index % 9 === 0) ? 1 : 0, first_seen_at: iso(beginning), last_seen_at: iso(end),
                    first_observed_round: unknownStart ? 5 : 1, present_at_start: unknownStart ? null : 1 });
            }
        }
        const metric = handle.prepare('INSERT INTO metric_samples(at,server,game,map,players,capacity) VALUES(?,?,?,?,?,4)');
        for (let minute = 0; minute < 7 * 1440; minute++) {
            for (const [index, server] of fixtureServers.entries()) {
                const count = Math.floor((Math.sin(minute / 90 + index) + 1) * 2.49);
                metric.run(now - minute * MINUTE, server.name, server.game, server.map.friendly,
                    minute % 720 < 8 && index === 5 ? null : count);
            }
        }
        for (const scope of ['*', ...[1, 2, 3].map(index => `fixture-host-${index}`)]) for (const phase of ['startup', 'running']) {
            insert('ec_resource_allowances', { scope, phase, cpu_cores: phase === 'startup' ? 1 : 0.5,
                memory_bytes: Math.round((phase === 'startup' ? 1.2 : 0.8) * GIB), samples: 240,
                window_start: iso(now - DAY), observed_at: iso(now), computed_at: iso(now), usage_margin: 1 });
        }
        // Real artifact blobs, so details and downloads work without game files.
        for (const [index, kind] of ['script', 'baseline', 'config'].entries()) {
            const content = Buffer.from(kind === 'script' ? '// Synthetic UI fixture; no gameplay behavior.\n' : '// Synthetic UI fixture configuration.\nset sv_maxclients 4\n');
            const hash = createHash('sha256').update(content).digest('hex');
            handle.prepare('INSERT OR IGNORE INTO file_blobs(sha256,size,content) VALUES(?,?,?)').run(hash, content.length, content);
            insert('scripts', { id: index + 1, name: ['Fixture telemetry', 'Fixture Black Ops I baseline', 'Fixture lobby settings'][index],
                target_rel_path: index === 0 ? 'fixture.gsc' : index === 1 ? 'dedicated_sp.cfg' : 'fixture.cfg',
                scope_type: 'game', scope_value: 't5', current_version_id: index + 1, kind, created_at: started });
            insert('script_versions', { id: index + 1, script_id: index + 1, version: 1, sha256: hash, content_hash: hash,
                size: content.length, notes: 'Synthetic preview content.', state: 'tested', kind, uploaded_at: started });
        }
        for (let index = 0; index < 36; index++) {
            const failed = index % 7 === 0;
            const server = fixtureServers[failed ? 5 : index % fixtureServers.length];
            const id = `fixture-operation-${index + 1}`;
            const state = failed ? 'failed' : index % 11 === 0 ? 'cancelled' : 'done';
            insert('server_deployments', { id, server: server.name, action: ['restart', 'start', 'rebuild', 'stop'][index % 4], state,
                stage: failed ? 'Verification failed' : state === 'done' ? 'Completed' : 'Cancelled before dispatch',
                started_at: iso(now - (60 + index * 2) * MINUTE), finished_at: iso(now - (59 + index * 2) * MINUTE), triggered_by: 'Fixture operator',
                error: failed ? 'Synthetic verification timeout. No host command was sent.' : null, warnings: '[]' });
            insert('native_provisioning', { deployment_id: id, instance_id: server.instance, generation: 1 });
            insert('server_deployment_events', { deployment_id: id, created_at: iso(now - (59 + index * 2) * MINUTE), message: 'Synthetic retained history; no command was sent.' });
        }
        for (let index = 0; index < 8; index++) {
            const server = fixtureServers[index % fixtureServers.length];
            insert('ec_host_operations', { id: `fixture-host-command-${index + 1}`, host_id: server.host, instance_id: server.instance,
                server_name: server.name, kind: index % 2 ? 'instance.inspect' : 'instance.restart', payload: '{}',
                state: index % 3 ? 'completed' : 'failed', result: '{}', error: index % 3 ? null : 'Synthetic command failure.',
                created_at: iso(now - (90 + index * 3) * MINUTE), updated_at: iso(now - (89 + index * 3) * MINUTE), source: 'Fixture operator' });
        }
        for (let index = 0; index < 3; index++) {
            const server = fixtureServers[index === 0 ? 1 : index === 1 ? 5 : index];
            insert('maintenance_jobs', { id: index + 1, server: server.name, state: index === 1 ? 'failed' : 'done', target_revision: 4878,
                requested_at: iso(now - (120 + index * 4) * MINUTE), finished_at: iso(now - (119 + index * 4) * MINUTE),
                detail: index === 1 ? 'Synthetic update could not be verified.' : 'Synthetic scheduled restart completed.', kind: 'schedule', origin: 'manual',
                provisioning_id: index === 0 ? 'fixture-operation-2' : null });
            insert('watchdog_incidents', { id: `fixture-recovery-${index + 1}`, server: server.name, kind: 'health', state: 'resolved',
                summary: 'Synthetic recovery finding resolved.', details: '{}', first_seen_at: iso(now - (130 + index * 4) * MINUTE),
                last_seen_at: iso(now - (129 + index * 4) * MINUTE), finished_at: iso(now - (129 + index * 4) * MINUTE) });
            insert('deployments', { id: `fixture-campaign-${index + 1}`, action: 'drift', started_at: iso(now - (140 + index * 4) * MINUTE),
                finished_at: iso(now - (139 + index * 4) * MINUTE), triggered_by: 'Fixture operator' });
            insert('deployment_servers', { deployment_id: `fixture-campaign-${index + 1}`, server: server.name, files_changed: 1, restart_state: 'done', players: 0 });
        }
        for (let index = 0; index < 2; index++) {
            insert('betas', { id: index + 1, script_id: 1, script_version_id: 1, trigger_kind: 'ui', state: index ? 'rolled-back' : 'promoted',
                opened_at: iso(now - (150 + index * 3) * MINUTE), closed_at: iso(now - (149 + index * 3) * MINUTE), notes: 'Synthetic completed beta.' });
            insert('beta_scripts', { beta_id: index + 1, script_id: 1, script_version_id: 1, kind: 'script' });
            insert('beta_servers', { beta_id: index + 1, server: fixtureServers[index].name, had_original: 0, stage: 'ready', updated_at: iso(now - (149 + index * 3) * MINUTE) });
        }
        insert('provisioning_sources', { operation_id: 'fixture-operation-2', kind: 'maintenance', source_id: '1', server: fixtureServers[1].name });
        insert('provisioning_sources', { operation_id: 'fixture-operation-3', kind: 'autoscaling', source_id: 'fixture-paused-plan', server: fixtureServers[2].name });
    })();
}

/** Refreshes existing synthetic observations only; never queues work or writes real files. */
export function refreshFixtureData(handle: Database.Database, now: number): void {
    const marker = handle.prepare('SELECT value FROM settings WHERE key=?').get(FIXTURE_KEY) as { value: string } | undefined;
    if (marker?.value !== FIXTURE_VERSION) throw new Error('Refusing to refresh an unmarked database.');
    if (!Number.isFinite(now)) throw new Error('Invalid fixture time.');
    handle.transaction(() => {
        for (const [index, server] of fixtureServers.entries()) {
            handle.prepare(`UPDATE servers SET last_seen_at=?,last_checked_at=?,container_checked_at=?,container_state=?,
                last_players=?,last_map=?,last_roster=?,last_error=?,rcon_failures=?,last_reply_snippet=NULL WHERE name=?`)
                .run(seenAt(server, now), iso(now), iso(now), containerState(server), server.players, server.map.canonical,
                    JSON.stringify(rosterFor(server, index)), server.state === 'stale' ? 'timeout: no reply from game server' : null,
                    server.state === 'stale' ? 2 : 0, server.name);
            handle.prepare(`UPDATE server_telemetry SET received_at=?,payload=json_set(payload,'$.receivedAt',?) WHERE server=?`).run(iso(now), iso(now), server.name);
            handle.prepare("UPDATE leaderboard_matches SET last_received_at=? WHERE server=? AND status='active' AND id BETWEEN 495 AND 500").run(iso(now), server.name);
            handle.prepare('UPDATE plutonium_versions SET checked_at=? WHERE server=?').run(iso(now), server.name);
        }
        for (let index = 1; index <= 3; index++) {
            const id = `fixture-host-${index}`;
            handle.prepare("UPDATE ec_hosts SET last_heartbeat=?,inventory=json_set(inventory,'$.instanceStates',json(?)) WHERE id=?")
                .run(iso(now - (index === 3 ? 10 * MINUTE : 0)), JSON.stringify(instanceStates(id, now)), id);
        }
    })();
}