// T5/T6 zombies map catalogs. 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 (used for script scoping)
//
// Add rows when new maps land; keep slugs short so paths stay readable.

export interface ZombieMapEntry {
    friendly: string;
    slug: string;
    canonical: string;
    /** T6 selects a ruleset/location before loading the engine map. */
    gameSettings?: string;
}

export type T5MapEntry = ZombieMapEntry;
export type ZombieGame = 't5' | 't6';

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: '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' }
]);

// Rulesets from xerxes-at/T6ServerConfigs, also seeded by Plutainer.
// Several selections share an engine map; slug preserves the selected variant.
export const T6_ZOMBIE_MAPS: readonly ZombieMapEntry[] = Object.freeze([
    { friendly: 'TranZit', slug: 'transit', canonical: 'zm_transit', gameSettings: 'zm_classic_transit.cfg' },
    { friendly: 'Town Survival', slug: 'town', canonical: 'zm_transit', gameSettings: 'zm_standard_town.cfg' },
    { friendly: 'Farm Survival', slug: 'farm', canonical: 'zm_transit', gameSettings: 'zm_standard_farm.cfg' },
    { friendly: 'Bus Depot Survival', slug: 'busdepot', canonical: 'zm_transit', gameSettings: 'zm_standard_transit.cfg' },
    { friendly: 'Nuketown', slug: 'nuked', canonical: 'zm_nuked', gameSettings: 'zm_standard_nuked.cfg' },
    { friendly: 'Die Rise', slug: 'highrise', canonical: 'zm_highrise', gameSettings: 'zm_classic_rooftop.cfg' },
    { friendly: 'Mob of the Dead', slug: 'prison', canonical: 'zm_prison', gameSettings: 'zm_classic_prison.cfg' },
    { friendly: 'Buried', slug: 'buried', canonical: 'zm_buried', gameSettings: 'zm_classic_processing.cfg' },
    { friendly: 'Origins', slug: 'tomb', canonical: 'zm_tomb', gameSettings: 'zm_classic_tomb.cfg' },
    { friendly: 'Town Grief', slug: 'towngrief', canonical: 'zm_transit', gameSettings: 'zm_grief_town.cfg' },
    { friendly: 'Farm Grief', slug: 'farmgrief', canonical: 'zm_transit', gameSettings: 'zm_grief_farm.cfg' },
    { friendly: 'Bus Depot Grief', slug: 'busdepotgrief', canonical: 'zm_transit', gameSettings: 'zm_grief_transit.cfg' },
    { friendly: 'Cell Block Grief', slug: 'cellblock', canonical: 'zm_prison', gameSettings: 'zm_grief_cellblock.cfg' },
    { friendly: 'Buried Grief', slug: 'buriedgrief', canonical: 'zm_buried', gameSettings: 'zm_grief_street.cfg' },
    { friendly: 'Diner Turned', slug: 'diner', canonical: 'zm_transit_dr', gameSettings: 'zm_cleansed_diner.cfg' },
    { friendly: 'Buried Turned', slug: 'buriedturned', canonical: 'zm_buried', gameSettings: 'zm_cleansed_street.cfg' }
]);

export function zombieMaps(game: string | null): readonly ZombieMapEntry[] {
    return game === 't5' ? T5_ZOMBIE_MAPS : game === 't6' ? T6_ZOMBIE_MAPS : [];
}

export function zombieMapBySlug(game: string, slug: string): ZombieMapEntry | undefined {
    return zombieMaps(game).find((entry) => entry.slug === slug.toLowerCase());
}

export function selectedZombieMap(game: string | null, map: string | null, slug?: string | null): ZombieMapEntry | undefined {
    const maps = zombieMaps(game);
    // T5 maps are unambiguous, including legacy friendly slugs. T6 variants
    // require the stored selection; never fall back from an unknown variant.
    return maps.find((entry) => entry.canonical === map && (
        game !== 't6' || !slug || entry.slug === slug
        || entry.friendly.toLowerCase().replace(/[^a-z0-9]/g, '') === slug
    ));
}

export function mapRotation(entry: ZombieMapEntry): string {
    return `${entry.gameSettings ? `execgts ${entry.gameSettings} ` : ''}map ${entry.canonical}`;
}

const BY_SLUG: ReadonlyMap<string, T5MapEntry> = new Map(
    T5_ZOMBIE_MAPS.map((m) => [m.slug, 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 catalog = zombieMaps(game.toLowerCase());
    const entry = gameMode === null || gameMode === 'zombie'
        ? catalog.find((m) => m.slug === mapSlug)
            ?? catalog.find((m) => m.friendly.toLowerCase().replace(/[^a-z0-9]/g, '') === mapSlug)
        : undefined;
    const mapCanonical = entry?.canonical ?? null;
    return { game, gameMode, mapSlug, mapCanonical, lobby };
}