package com.xly.web;

import com.xly.service.ConversationService;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;
import java.util.Map;

/**
 * 会话管理 REST —— 支撑前端的「多命名会话」侧栏（列表 / 新建 / 删除 / 历史）。
 */
@RestController
@RequestMapping("/api/agent/conversations")
public class ConversationController {

    private final ConversationService conversations;

    public ConversationController(ConversationService conversations) {
        this.conversations = conversations;
    }

    /** 列出某用户的会话（最近更新在前）。 */
    @GetMapping
    public List<Map<String, Object>> list(@RequestParam("userid") String userid) {
        return conversations.list(userid);
    }

    /** 新建空会话，返回 conversationId。 */
    @PostMapping
    public Map<String, String> create(@RequestBody Map<String, String> body) {
        String userid = body.getOrDefault("userid", "anon");
        return Map.of("conversationId", conversations.create(userid));
    }

    /** 删除会话（含其消息记忆）。 */
    @DeleteMapping("/{convId}")
    public Map<String, Object> delete(@PathVariable("convId") String convId,
                                      @RequestParam("userid") String userid) {
        conversations.delete(userid, convId);
        return Map.of("ok", true);
    }

    /** 会话历史消息（用于切换会话时回填）。 */
    @GetMapping("/{convId}/messages")
    public List<Map<String, String>> messages(@PathVariable("convId") String convId) {
        return conversations.history(convId);
    }
}