package com.ruoyi.ai.controller;

import com.ruoyi.ai.assistant.SalesAgent;
import com.ruoyi.ai.assistant.SalesIntentExecutor;
import com.ruoyi.ai.bean.ChatForm;
import com.ruoyi.ai.context.AiSessionUserContext;
import com.ruoyi.ai.service.AiChatSessionService;
import com.ruoyi.ai.store.MongoChatMemoryStore;
import com.ruoyi.common.utils.SecurityUtils;
import com.ruoyi.common.utils.StringUtils;
import com.ruoyi.framework.security.LoginUser;
import com.ruoyi.framework.web.controller.BaseController;
import com.ruoyi.framework.web.domain.R;
import dev.langchain4j.data.message.AiMessage;
import dev.langchain4j.data.message.UserMessage;
import io.swagger.v3.oas.annotations.Operation;
import io.swagger.v3.oas.annotations.tags.Tag;
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.RestController;
import reactor.core.publisher.Flux;

import java.util.List;

@Tag(name = "销售助手智能体")
@RestController
@RequestMapping("/sales-ai")
public class SalesAiController extends BaseController {

    private final SalesAgent salesAgent;
    private final SalesIntentExecutor salesIntentExecutor;
    private final AiSessionUserContext aiSessionUserContext;
    private final MongoChatMemoryStore mongoChatMemoryStore;
    private final AiChatSessionService aiChatSessionService;

    public SalesAiController(SalesAgent salesAgent,
                             SalesIntentExecutor salesIntentExecutor,
                             AiSessionUserContext aiSessionUserContext,
                             MongoChatMemoryStore mongoChatMemoryStore,
                             AiChatSessionService aiChatSessionService) {
        this.salesAgent = salesAgent;
        this.salesIntentExecutor = salesIntentExecutor;
        this.aiSessionUserContext = aiSessionUserContext;
        this.mongoChatMemoryStore = mongoChatMemoryStore;
        this.aiChatSessionService = aiChatSessionService;
    }

    @Operation(summary = "销售助手对话")
    @PostMapping(value = "/chat", produces = "text/stream;charset=utf-8")
    public Flux<String> chat(@RequestBody ChatForm chatForm) {
        if (!StringUtils.hasText(chatForm.getMemoryId())) {
            return Flux.just("memoryId不能为空");
        }
        if (!StringUtils.hasText(chatForm.getMessage())) {
            return Flux.just("message不能为空");
        }

        LoginUser loginUser = SecurityUtils.getLoginUser();
        String memoryId = chatForm.getMemoryId();
        String userMessage = chatForm.getMessage();

        aiSessionUserContext.bind(memoryId, loginUser);
        aiChatSessionService.touchSession(memoryId, loginUser, userMessage);

        String directResponse = salesIntentExecutor.tryExecute(memoryId, userMessage);
        if (StringUtils.isNotEmpty(directResponse)) {
            mongoChatMemoryStore.appendMessages(
                    memoryId,
                    List.of(UserMessage.from(userMessage), AiMessage.from(directResponse))
            );
            aiChatSessionService.refreshSessionStats(memoryId, loginUser);
            return Flux.just(directResponse);
        }

        if (isBusinessDataIntent(userMessage)) {
            String noGuessResponse = "未识别到可执行的数据查询条件。为保证结果准确，当前不会推测或编造数据，请补充明确时间范围、客户或单号后再查询。";
            mongoChatMemoryStore.appendMessages(
                    memoryId,
                    List.of(UserMessage.from(userMessage), AiMessage.from(noGuessResponse))
            );
            aiChatSessionService.refreshSessionStats(memoryId, loginUser);
            return Flux.just(noGuessResponse);
        }

        return salesAgent.chat(memoryId, userMessage)
                .doOnComplete(() -> aiChatSessionService.refreshSessionStats(memoryId, loginUser))
                .doOnError(ex -> aiChatSessionService.refreshSessionStats(memoryId, loginUser));
    }

    @Operation(summary = "销售助手会话列表")
    @GetMapping("/history/sessions")
    public R<?> listSessions() {
        return R.ok(aiChatSessionService.listCurrentUserSessions(SecurityUtils.getLoginUser()));
    }

    @Operation(summary = "销售助手会话消息")
    @GetMapping("/history/messages/{memoryId}")
    public R<?> listMessages(@PathVariable String memoryId) {
        return R.ok(aiChatSessionService.listCurrentUserMessages(memoryId, SecurityUtils.getLoginUser()));
    }

    @Operation(summary = "删除销售助手会话")
    @DeleteMapping("/history/{memoryId}")
    public R<?> deleteSession(@PathVariable String memoryId) {
        aiSessionUserContext.remove(memoryId);
        aiChatSessionService.deleteCurrentUserSession(memoryId, SecurityUtils.getLoginUser());
        return R.ok();
    }

    private boolean isBusinessDataIntent(String message) {
        if (!StringUtils.hasText(message)) {
            return false;
        }
        String text = message.trim();
        return containsAny(text,
                "查询", "查看", "统计", "分析", "建议", "客户档案", "私海", "公海",
                "销售报价", "销售台账", "销售退货", "客户往来", "发货台账", "回款", "报价", "风险");
    }

    private boolean containsAny(String text, String... keywords) {
        for (String keyword : keywords) {
            if (text.contains(keyword)) {
                return true;
            }
        }
        return false;
    }
}