export interface BotConfig {
  token: string;
  guildId: string;
  appUrl: string;
  opsChannelId: string | null;
  announceChannelId: string | null;
  staffRoleIds: string[];
  sideOpsChannelId: string | null;
  communityZeusRoleId: string | null;
  attendancePollMs: number;
  notificationPollMs: number;
  evaluationPollMs: number;
  readyReminderPollMs: number;
  imminentReminderPollMs: number;
  sideOpsNoticePollMs: number;
}

const required = (name: string): string => {
  const value = process.env[name]?.trim();
  if (!value) {
    throw new Error(`[Bot] Missing required environment variable: ${name}`);
  }
  return value;
};

const optional = (name: string): string | null => {
  const value = process.env[name]?.trim();
  return value ? value : null;
};

const pollMs = (name: string, fallback: number): number => {
  const raw = process.env[name]?.trim();
  if (!raw) {
    return fallback;
  }
  const value = Number.parseInt(raw, 10);
  if (!Number.isInteger(value) || value <= 0) {
    throw new Error(`[Bot] Invalid ${name}: expected a positive integer, got "${raw}"`);
  }
  return value;
};

export const botConfig: BotConfig = {
  token: required("DISCORD_TOKEN"),
  guildId: required("DISCORD_GUILD_ID"),
  appUrl: required("APP_URL"),
  opsChannelId: optional("DISCORD_OPS_CHANNEL_ID"),
  announceChannelId: optional("DISCORD_ANNOUNCE_CHANNEL_ID"),
  staffRoleIds: (optional("DISCORD_STAFF_ROLE_IDS") ?? "")
    .split(",")
    .map((id) => id.trim())
    .filter((id) => id.length > 0),
  sideOpsChannelId: optional("DISCORD_SIDE_OPS_CHANNEL_ID"),
  communityZeusRoleId: optional("DISCORD_COMMUNITY_ZEUS_ROLE_ID"),
  attendancePollMs: pollMs("DISCORD_ATTENDANCE_POLL_MS", 60_000),
  notificationPollMs: pollMs("DISCORD_NOTIFICATION_POLL_MS", 20_000),
  evaluationPollMs: pollMs("DISCORD_EVALUATION_POLL_MS", 60_000),
  readyReminderPollMs: pollMs("DISCORD_READY_REMINDER_POLL_MS", 60_000),
  imminentReminderPollMs: pollMs("DISCORD_IMMINENT_POLL_MS", 60_000),
  sideOpsNoticePollMs: pollMs("DISCORD_SIDE_OPS_POLL_MS", 1_800_000),
};