// T5 (Black Ops 1) zombies map catalog. Server names encode `slug` so we can
// derive game, mode, and map from the folder name (t5_zombie_cosmodrome_1 →
// game 't5', mode 'zombie', slug 'cosmodrome', canonical 'zombie_cosmodrome').
//
// Fields:
//   friendly  — human name shown in the deploy UI dropdown
//   slug      — segment used in server name (t5_zombie_<slug>_<n>)
//   canonical — actual mapname Pluto/RCON emits (matches T5 script scoping)
//
// Add rows when new maps land; keep slugs short so paths stay readable.

export interface T5MapEntry {
    friendly: string;
    slug: string;
    canonical: string;
}

export const T5_ZOMBIE_MAPS: readonly T5MapEntry[] = Object.freeze([
    { friendly: 'Kino Der Toten', slug: 'theater', canonical: 'zombie_theater' },
    { friendly: 'Ascension', slug: 'cosmodrome', canonical: 'zombie_cosmodrome' },
    { friendly: 'Call of the Dead', slug: 'coast', canonical: 'zombie_coast' },
    { friendly: 'Shangri-La', slug: 'temple', canonical: 'zombie_temple' },
    { friendly: 'Moon', slug: 'moon', canonical: 'zombie_moon' },
    { friendly: 'Five', slug: 'pentagon', canonical: 'zombie_pentagon' },
    { friendly: 'Dead Ops Arcade', slug: 'zombietron', canonical: 'zombietron' },
    { friendly: 'Nacht Der Untoten', slug: 'prototype', canonical: 'zombie_cod5_prototype' },
    { friendly: 'Verrückt', slug: 'asylum', canonical: 'zombie_cod5_asylum' },
    { friendly: 'Shi No Numa', slug: 'sumpf', canonical: 'zombie_cod5_sumpf' },
    { friendly: 'Der Riese', slug: 'factory', canonical: 'zombie_cod5_factory' }
]);

const BY_SLUG: ReadonlyMap<string, T5MapEntry> = new Map(
    T5_ZOMBIE_MAPS.map((m) => [m.slug, m])
);
// Older folder names used friendly names (shi_no_numa) instead of engine
// slugs (sumpf). Keep deriving their canonical map from the same catalog.
const BY_FRIENDLY_SLUG: ReadonlyMap<string, T5MapEntry> = new Map(
    T5_ZOMBIE_MAPS.map((m) => [m.friendly.toLowerCase().replace(/[^a-z0-9]/g, ''), m])
);

export function t5ZombieMapBySlug(slug: string): T5MapEntry | undefined {
    return BY_SLUG.get(slug.toLowerCase());
}

export type GameMode = 'zombie' | 'mp' | 'sp';

export interface ParsedServerName {
    game: string;               // 't5'
    gameMode: GameMode | null;  // 'zombie' — null when the second segment isn't a known mode
    mapSlug: string;            // 'cosmodrome' — joined without separators for lookup
    mapCanonical: string | null;// 'zombie_cosmodrome' — null when slug not in catalog
    lobby: number | null;
}

const KNOWN_MODES: ReadonlySet<GameMode> = new Set(['zombie', 'mp', 'sp']);

/**
 * `t5_zombie_cosmodrome_1` → { game:'t5', gameMode:'zombie', mapSlug:'cosmodrome', mapCanonical:'zombie_cosmodrome', lobby:1 }
 *
 * Rules:
 *   - First segment = game
 *   - Second segment = mode when it matches a known mode (zombie|mp|sp); otherwise the whole
 *     tail is treated as legacy `<game>_<slug>_<n>` (mode null, slug from segments 1..-1)
 *   - Trailing all-digits segment = lobby number
 *   - Everything in between = map slug (joined without separators for the catalog lookup)
 *
 * Multi-word slugs still work because we strip underscores when looking up
 * (e.g. `t5_zombie_shi_no_numa_1` → slug 'shinonuma').
 */
export function parseServerName(name: string): ParsedServerName | null {
    const parts = name.split('_').filter(Boolean);
    if (parts.length < 2) return null;
    const game = parts[0];
    const lastIsLobby = /^\d+$/.test(parts[parts.length - 1]);
    const lobby = lastIsLobby ? Number.parseInt(parts[parts.length - 1], 10) : null;
    const tail = lastIsLobby ? parts.slice(1, -1) : parts.slice(1);
    if (tail.length === 0) return null;

    let gameMode: GameMode | null = null;
    let slugParts = tail;
    const maybeMode = tail[0].toLowerCase();
    if (KNOWN_MODES.has(maybeMode as GameMode)) {
        gameMode = maybeMode as GameMode;
        slugParts = tail.slice(1);
    }
    if (slugParts.length === 0) return null;

    const mapSlug = slugParts.join('').toLowerCase();
    const mapCanonical = (BY_SLUG.get(mapSlug) ?? BY_FRIENDLY_SLUG.get(mapSlug))?.canonical ?? null;
    return { game, gameMode, mapSlug, mapCanonical, lobby };
}