package jnpf.limsService.print;

import jnpf.exception.DataException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * Spring 启动时收集所有 {@link PrintTemplateRenderer} 实现，按 templateId 索引。
 * Controller 通过 {@link #get(String)} 路由到具体 renderer。
 */
@Component
public class PrintRendererRegistry {

    private final Map<String, PrintTemplateRenderer> renderers;

    @Autowired
    public PrintRendererRegistry(List<PrintTemplateRenderer> rendererList) {
        Map<String, PrintTemplateRenderer> map = new HashMap<>();
        for (PrintTemplateRenderer r : rendererList) {
            String key = r.getTemplateId();
            if (key == null || key.isEmpty()) {
                continue;
            }
            PrintTemplateRenderer existed = map.put(key, r);
            if (existed != null) {
                throw new IllegalStateException(
                        "重复的 PrintTemplateRenderer template_id=" + key
                                + "，冲突类: " + existed.getClass().getName()
                                + " vs " + r.getClass().getName());
            }
        }
        this.renderers = Collections.unmodifiableMap(map);
    }

    public PrintTemplateRenderer get(String templateId) {
        PrintTemplateRenderer r = renderers.get(templateId);
        if (r == null) {
            throw new DataException("找不到打印模板的渲染器: " + templateId);
        }
        return r;
    }
}