Method fetchStream

web/src/lib/services/ChatService.ts:46–87

(
		request: ChatRequest,
	)

	}

	private async fetchStream(
		request: ChatRequest,
	): Promise<ReadableStream<StreamResponse>> {
		try {
			console.log("\n=== ChatService Request Start ===");
			console.log("1. Request details:", {
				language: get(languageStore),
				pattern: get(selectedPatternName),
				promptCount: request.prompts?.length,
				messageCount: request.messages?.length,
			});
			// NEW: Log the full payload before sending to backend
			console.log(
				"Final ChatRequest payload:",
				JSON.stringify(request, null, 2),
			);

			const response = await fetch("/api/chat", {
				method: "POST",
				headers: { "Content-Type": "application/json" },
				body: JSON.stringify(request),
			});

			if (!response.ok) {
				throw new ChatError(
					`HTTP error! status: ${response.status}`,
					"HTTP_ERROR",
					{ status: response.status },
				);
			}

			const reader = response.body?.getReader();
			if (!reader) {
				throw new ChatError("Response body is null", "NULL_RESPONSE");
			}

			return this.createMessageStream(reader);
		} catch (error) {
			if (error instanceof ChatError) throw error;
			throw new ChatError("Failed to fetch chat stream", "FETCH_ERROR", error);
		}
	}

	/**
	 * Clean up pattern output for display. Should only be called on complete/accumulated content,