/**
 * kernel-triggers.ts - Triggers API methods for KernelClient
 *
 * Installed onto KernelClient.prototype via installTriggerMethods().
 */

import { invoke } from '@tauri-apps/api/core';
import type { KernelClient } from './kernel-client';

/** Trigger shape shared across trigger operations. */
type TriggerItem = {
  id: string;
  name: string;
  handId: string;
  triggerType: string;
  enabled: boolean;
  createdAt: string;
  modifiedAt: string;
  description?: string;
  tags: string[];
};

/** Trigger type definition for create/update operations. */
type TriggerTypeSpec = {
  type: string;
  cron?: string;
  pattern?: string;
  path?: string;
  secret?: string;
  events?: string[];
};

export function installTriggerMethods(ClientClass: { prototype: KernelClient }): void {
  const proto = ClientClass.prototype as any;

  // ─── Triggers API ───

  /**
   * List all triggers
   * Returns empty array on error for graceful degradation
   */
  proto.listTriggers = async function (this: KernelClient): Promise<{
    triggers?: TriggerItem[]
  }> {
    try {
      const triggers = await invoke<TriggerItem[]>('trigger_list');
      return { triggers };
    } catch (error) {
      this.log('error', `[TriggersAPI] listTriggers failed: ${this.formatError(error)}`);
      return { triggers: [] };
    }
  };

  /**
   * Get a single trigger by ID
   * Returns null on error for graceful degradation
   */
  proto.getTrigger = async function (this: KernelClient, id: string): Promise<TriggerItem | null> {
    try {
      return await invoke<TriggerItem | null>('trigger_get', { id });
    } catch (error) {
      this.log('error', `[TriggersAPI] getTrigger(${id}) failed: ${this.formatError(error)}`);
      return null;
    }
  };

  /**
   * Create a new trigger
   * Returns null on error for graceful degradation
   */
  proto.createTrigger = async function (this: KernelClient, trigger: {
    id: string;
    name: string;
    handId: string;
    triggerType: TriggerTypeSpec;
    enabled?: boolean;
    description?: string;
    tags?: string[];
  }): Promise<TriggerItem | null> {
    try {
      return await invoke<TriggerItem>('trigger_create', { request: trigger });
    } catch (error) {
      this.log('error', `[TriggersAPI] createTrigger(${trigger.id}) failed: ${this.formatError(error)}`);
      return null;
    }
  };

  /**
   * Update an existing trigger
   * Throws on error as this is a mutation operation that callers need to handle
   */
  proto.updateTrigger = async function (this: KernelClient, id: string, updates: {
    name?: string;
    enabled?: boolean;
    handId?: string;
    triggerType?: TriggerTypeSpec;
  }): Promise<TriggerItem> {
    try {
      return await invoke<TriggerItem>('trigger_update', {
        id,
        name: updates.name,
        enabled: updates.enabled,
        handId: updates.handId,
      });
    } catch (error) {
      this.log('error', `[TriggersAPI] updateTrigger(${id}) failed: ${this.formatError(error)}`);
      throw error;
    }
  };

  /**
   * Delete a trigger
   * Throws on error as this is a destructive operation that callers need to handle
   */
  proto.deleteTrigger = async function (this: KernelClient, id: string): Promise<void> {
    try {
      await invoke('trigger_delete', { id });
    } catch (error) {
      this.log('error', `[TriggersAPI] deleteTrigger(${id}) failed: ${this.formatError(error)}`);
      throw error;
    }
  };

  /**
   * Execute a trigger
   * Throws on error as callers need to know if execution failed
   */
  proto.executeTrigger = async function (this: KernelClient, id: string, input?: Record<string, unknown>): Promise<Record<string, unknown>> {
    try {
      return await invoke<Record<string, unknown>>('trigger_execute', { id, input: input || {} });
    } catch (error) {
      this.log('error', `[TriggersAPI] executeTrigger(${id}) failed: ${this.formatError(error)}`);
      throw error;
    }
  };
}