/**
 * Multi-agent local schedule cache.
 *
 * Maintains today's schedule for all agents on this claw instance.
 * Synced periodically from HF backend via /calendar/sync endpoint.
 */

export interface CachedSlot {
  id: number | null;
  virtual_id: string | null;
  slot_type: string;
  estimated_duration: number;
  scheduled_at: string;
  status: string;
  priority: number;
  event_type: string | null;
  event_data: Record<string, unknown> | null;
  [key: string]: unknown;
}

export class MultiAgentScheduleCache {
  /** { agentId → slots[] } */
  private schedules: Map<string, CachedSlot[]> = new Map();
  private lastSyncAt: Date | null = null;
  private cachedDate: string | null = null;

  /**
   * Replace cache with data from /calendar/sync response.
   */
  sync(date: string, schedules: Record<string, CachedSlot[]>): void {
    if (this.cachedDate !== date) {
      this.schedules.clear();
    }
    this.cachedDate = date;

    for (const [agentId, slots] of Object.entries(schedules)) {
      this.schedules.set(agentId, slots);
    }
    this.lastSyncAt = new Date();
  }

  /**
   * Get agents that have due (overdue or current) slots.
   * Returns [agentId, dueSlots[]] pairs.
   */
  getAgentsWithDueSlots(now: Date): Array<{ agentId: string; slots: CachedSlot[] }> {
    const results: Array<{ agentId: string; slots: CachedSlot[] }> = [];

    for (const [agentId, slots] of this.schedules) {
      const due = slots.filter((s) => {
        if (s.status !== 'not_started' && s.status !== 'deferred') return false;
        const scheduledAt = this.parseScheduledTime(s.scheduled_at);
        return scheduledAt !== null && scheduledAt <= now;
      });

      if (due.length > 0) {
        // Sort by priority descending
        due.sort((a, b) => (b.priority ?? 0) - (a.priority ?? 0));
        results.push({ agentId, slots: due });
      }
    }
    return results;
  }

  /**
   * Get all agent IDs in the cache.
   */
  getAgentIds(): string[] {
    return Array.from(this.schedules.keys());
  }

  /**
   * Get slots for a specific agent.
   */
  getAgentSlots(agentId: string): CachedSlot[] {
    return this.schedules.get(agentId) ?? [];
  }

  /**
   * Get cache status for debugging.
   */
  getStatus(): { agentCount: number; totalSlots: number; lastSyncAt: string | null; cachedDate: string | null } {
    let totalSlots = 0;
    for (const slots of this.schedules.values()) totalSlots += slots.length;
    return {
      agentCount: this.schedules.size,
      totalSlots,
      lastSyncAt: this.lastSyncAt?.toISOString() ?? null,
      cachedDate: this.cachedDate,
    };
  }

  private parseScheduledTime(scheduledAt: string): Date | null {
    if (/^\d{2}:\d{2}(:\d{2})?$/.test(scheduledAt)) {
      if (!this.cachedDate) return null;
      return new Date(`${this.cachedDate}T${scheduledAt}Z`);
    }
    const d = new Date(scheduledAt);
    return isNaN(d.getTime()) ? null : d;
  }
}