import { OllamaBaseBackend, OllamaMessage, OllamaChatResponse } from "./ollama-base.js";
import { OllamaLocalConfig } from "./types.js";
import { ToolRegistry } from "./tool-registry.js";

export class OllamaLocalBackend extends OllamaBaseBackend {
  readonly name = "ollama-local";

  private localConfig: OllamaLocalConfig;

  constructor(config?: OllamaLocalConfig) {
    super(config);
    this.localConfig = config || { base_url: "http://localhost:11434", model_profile: "balanced" };
  }

  async isAvailable(): Promise<boolean> {
    try {
      const response = await fetch(`${this.localConfig.base_url}/api/tags`, {
        signal: AbortSignal.timeout(5000),
      });
      return response.ok;
    } catch {
      return false;
    }
  }

  protected resolveModel(): string {
    if (this.localConfig.model) return this.localConfig.model;
    return this.modelProfileToModel(this.localConfig.model_profile, []);
  }

  protected async callModel(
    messages: OllamaMessage[],
    model: string,
    toolRegistry: ToolRegistry
  ): Promise<OllamaChatResponse> {
    let resolvedModel = model;
    if (!this.localConfig.model) {
      const models = await this.fetchAvailableModels();
      resolvedModel = this.modelProfileToModel(this.localConfig.model_profile, models);
    }
    const url = `${this.localConfig.base_url}/v1/chat/completions`;

    const body: Record<string, unknown> = {
      model: resolvedModel,
      messages: messages.map((m) => {
        const msg: Record<string, unknown> = { role: m.role, content: m.content };
        if (m.name) msg.name = m.name;
        if (m.tool_calls) msg.tool_calls = m.tool_calls;
        return msg;
      }),
      tools: this.getActiveToolSchema(toolRegistry),
      stream: false,
    };

    const timeout = this.localConfig.timeout_ms || 10000;

    const response = await fetch(url, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify(body),
      signal: AbortSignal.timeout(timeout),
    });

    if (!response.ok) {
      const errorText = await response.text().catch(() => "unknown error");
      throw new Error(`Ollama local API error (${response.status}): ${errorText}`);
    }

    return (await response.json()) as OllamaChatResponse;
  }

}