/**
 * Calcutta lifecycle state derivation and predicates.
 *
 * Maps the two server fields (status + auction_status) into one of five
 * user-facing lifecycle states so the UI can branch cleanly.
 */

export type CalcuttaLifecycleState =
    | 'pending'
    | 'scheduled'
    | 'auctioning'
    | 'tournament'
    | 'completed';

/**
 * Derive the lifecycle state from competition.status and competition.auction_status.
 *
 * Sweepstakes competitions skip the auctioning phase entirely:
 *   pending → scheduled → tournament → completed
 *
 * @param auction_type - Optional. When 'sweepstakes', the auctioning state is never returned.
 */
export function deriveLifecycleState(
    status?: string,
    auction_status?: string,
    auction_type?: string,
): CalcuttaLifecycleState {
    // ── Sweepstakes: no auction phase ──
    if (auction_type === 'sweepstakes') {
        if (!status || status === 'pending') return 'pending';
        if (status === 'scheduled') return 'scheduled';
        if (status === 'closed') return 'completed';
        // auction_closed, inprogress → tournament
        return 'tournament';
    }

    // ── Hard gate: server confirmed auction closed ──
    if (auction_status === 'closed') {
        return status === 'closed' ? 'completed' : 'tournament';
    }

    if (!status) {
        // No status but auction is in_progress — must be auctioning
        if (auction_status === 'in_progress') return 'auctioning';
        return 'pending';
    }

    switch (status) {
        case 'pending':
            return 'pending';
        case 'scheduled':
            return 'scheduled';
        case 'auction_open':
            return auction_status === 'in_progress' ? 'auctioning' : 'scheduled';
        case 'auction_closed':
        case 'inprogress':
            return 'tournament';
        case 'closed':
            return 'completed';
        default:
            // Unknown status — fall back to auction_status
            if (auction_status === 'in_progress') return 'auctioning';
            return 'pending';
    }
}

/** True when users can place / update / cancel bids */
export const canBid = (state: CalcuttaLifecycleState, auction_type?: string): boolean =>
    auction_type === 'sweepstakes' ? false : state === 'auctioning';

/** True when escrow deposit / withdraw controls should be interactive */
export const canManageEscrow = (state: CalcuttaLifecycleState, auction_type?: string): boolean =>
    auction_type === 'sweepstakes' ? false : (state === 'scheduled' || state === 'auctioning');

/** True when round results / leaderboard data is meaningful */
export const showResults = (state: CalcuttaLifecycleState): boolean =>
    state === 'tournament' || state === 'completed';