Add Sweetistics API posting support to bird

src/lib/sweetistics-client.ts

@@ -0,0 +1,70 @@
+export interface SweetisticsClientOptions {
+  baseUrl: string;
+  apiKey: string;
+  userAgent?: string;
+}
+
+export interface SweetisticsTweetResult {
+  success: boolean;
+  tweetId?: string;
+  error?: string;
+}
+
+function normalizeBaseUrl(value: string): string {
+  const trimmed = value.trim();
+  if (!trimmed) return 'https://sweetistics.com';
+  return trimmed.endsWith('/') ? trimmed.slice(0, -1) : trimmed;
+}
+
+export class SweetisticsClient {
+  private readonly baseUrl: string;
+  private readonly apiKey: string;
+  private readonly userAgent?: string;
+
+  constructor(options: SweetisticsClientOptions) {
+    this.baseUrl = normalizeBaseUrl(options.baseUrl);
+    this.apiKey = options.apiKey.trim();
+    this.userAgent = options.userAgent;
+    if (!this.apiKey) {
+      throw new Error('Sweetistics API key is required');
+    }
+  }
+
+  async tweet(text: string, replyToTweetId?: string): Promise<SweetisticsTweetResult> {
+    const payload: Record<string, unknown> = { text };
+    if (replyToTweetId) {
+      payload.replyToTweetId = replyToTweetId;
+    }
+
+    const response = await fetch(`${this.baseUrl}/api/actions/tweet`, {
+      method: 'POST',
+      headers: {
+        authorization: `Bearer ${this.apiKey}`,
+        'content-type': 'application/json',
+        ...(this.userAgent ? { 'user-agent': this.userAgent } : {}),
+      },
+      body: JSON.stringify(payload),
+    });
+
+    let data: unknown;
+    try {
+      data = await response.json();
+    } catch (error) {
+      return {
+        success: false,
+        error: `Sweetistics response parse failed: ${error instanceof Error ? error.message : String(error)}`,
+      };
+    }
+
+    const success = typeof (data as { success?: unknown })?.success === 'boolean' ? (data as { success: boolean }).success : false;
+    const tweetId = typeof (data as { tweetId?: unknown })?.tweetId === 'string' ? (data as { tweetId?: string }).tweetId : undefined;
+    const errorMessage = typeof (data as { error?: unknown })?.error === 'string' ? (data as { error?: string }).error : undefined;
+
+    if (!response.ok || !success) {
+      const reason = errorMessage || `HTTP ${response.status}`;
+      return { success: false, error: reason };
+    }
+
+    return { success: true, tweetId };
+  }
+}