package com.ruoyi.ai.controller;

import com.ruoyi.ai.assistant.FinancialAgent;
import com.ruoyi.ai.assistant.FinancialIntentExecutor;
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.AjaxResult;
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.time.LocalDate;
import java.time.ZoneId;
import java.time.format.DateTimeFormatter;
import java.util.List;

@Tag(name = "财务智能体")
@RestController
@RequestMapping("/financial-ai")
public class FinancialAiController extends BaseController {

    private static final DateTimeFormatter CURRENT_DATE_FMT = DateTimeFormatter.ofPattern("yyyy-MM-dd");
    private static final ZoneId CHINA_ZONE_ID = ZoneId.of("Asia/Shanghai");

    private final FinancialAgent financialAgent;
    private final FinancialIntentExecutor financialIntentExecutor;
    private final AiSessionUserContext aiSessionUserContext;
    private final MongoChatMemoryStore mongoChatMemoryStore;
    private final AiChatSessionService aiChatSessionService;

    public FinancialAiController(FinancialAgent financialAgent,
                                 FinancialIntentExecutor financialIntentExecutor,
                                 AiSessionUserContext aiSessionUserContext,
                                 MongoChatMemoryStore mongoChatMemoryStore,
                                 AiChatSessionService aiChatSessionService) {
        this.financialAgent = financialAgent;
        this.financialIntentExecutor = financialIntentExecutor;
        this.aiSessionUserContext = aiSessionUserContext;
        this.mongoChatMemoryStore = mongoChatMemoryStore;
        this.aiChatSessionService = aiChatSessionService;
    }

    @Operation(summary = "财务智能体对话")
    @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 = financialIntentExecutor.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);
        }

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

    @Operation(summary = "财务智能体会话列表")
    @GetMapping("/history/sessions")
    public AjaxResult listSessions() {
        return success(aiChatSessionService.listCurrentUserSessions(SecurityUtils.getLoginUser()));
    }

    @Operation(summary = "财务智能体会话消息")
    @GetMapping("/history/messages/{memoryId}")
    public AjaxResult listMessages(@PathVariable String memoryId) {
        return success(aiChatSessionService.listCurrentUserMessages(memoryId, SecurityUtils.getLoginUser()));
    }

    @Operation(summary = "删除财务智能体会话")
    @DeleteMapping("/history/{memoryId}")
    public AjaxResult deleteSession(@PathVariable String memoryId) {
        aiSessionUserContext.remove(memoryId);
        return toAjax(aiChatSessionService.deleteCurrentUserSession(memoryId, SecurityUtils.getLoginUser()));
    }

    private String currentDateForPrompt() {
        return LocalDate.now(CHINA_ZONE_ID).format(CURRENT_DATE_FMT);
    }
}