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package com.vincent.rsf.server.ai.service;
 
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.vincent.rsf.server.ai.model.AiPromptContext;
import com.vincent.rsf.server.manager.entity.Task;
import com.vincent.rsf.server.manager.enums.TaskStsType;
import com.vincent.rsf.server.manager.enums.TaskType;
import com.vincent.rsf.server.manager.mapper.TaskMapper;
import org.springframework.stereotype.Service;
 
import javax.annotation.Resource;
import java.util.*;
 
@Service
public class AiTaskSummaryService implements AiPromptContextProvider {
 
    @Resource
    private TaskMapper taskMapper;
 
    @Override
    public boolean supports(AiPromptContext context) {
        if (context == null || context.getQuestion() == null) {
            return false;
        }
        String normalized = context.getQuestion().toLowerCase(Locale.ROOT);
        return normalized.contains("task")
                || normalized.contains("任务")
                || normalized.contains("出库任务")
                || normalized.contains("入库任务")
                || normalized.contains("移库任务")
                || normalized.contains("备货任务");
    }
 
    @Override
    public String buildContext(AiPromptContext context) {
        List<Task> activeTasks = taskMapper.selectList(new LambdaQueryWrapper<Task>()
                .select(Task::getTaskCode, Task::getTaskStatus, Task::getTaskType, Task::getOrgLoc, Task::getTargLoc, Task::getUpdateTime)
                .eq(Task::getStatus, 1));
 
        Map<Integer, Long> statusCounters = new LinkedHashMap<>();
        Map<Integer, Long> typeCounters = new LinkedHashMap<>();
        for (Task task : activeTasks) {
            Integer taskStatus = task.getTaskStatus();
            Integer taskType = task.getTaskType();
            statusCounters.put(taskStatus, statusCounters.getOrDefault(taskStatus, 0L) + 1);
            typeCounters.put(taskType, typeCounters.getOrDefault(taskType, 0L) + 1);
        }
 
        List<Task> latestTasks = taskMapper.selectList(new LambdaQueryWrapper<Task>()
                .select(Task::getTaskCode, Task::getTaskStatus, Task::getTaskType, Task::getOrgLoc, Task::getTargLoc, Task::getUpdateTime)
                .eq(Task::getStatus, 1)
                .orderByDesc(Task::getUpdateTime)
                .last("limit 5"));
 
        StringBuilder summary = new StringBuilder();
        summary.append("以下是基于 man_task 的实时汇总，请优先依据这些任务数据回答；如果用户问题超出任务表范围，请明确说明。");
        summary.append("\n任务总览：共 ")
                .append(activeTasks.size())
                .append(" 条有效任务。");
        if (!statusCounters.isEmpty()) {
            summary.append("\n任务状态分布：")
                    .append(formatStatuses(statusCounters))
                    .append("。");
        }
        if (!typeCounters.isEmpty()) {
            summary.append("\n任务类型分布：")
                    .append(formatTypes(typeCounters))
                    .append("。");
        }
        if (!latestTasks.isEmpty()) {
            summary.append("\n最近更新任务 TOP5：")
                    .append(formatLatestTasks(latestTasks))
                    .append("。");
        }
        return summary.toString();
    }
 
    private String formatStatuses(Map<Integer, Long> rows) {
        List<String> parts = new ArrayList<>();
        for (Map.Entry<Integer, Long> row : rows.entrySet()) {
            parts.add(resolveTaskStatus(row.getKey()) + " " + row.getValue() + " 条");
        }
        return String.join("，", parts);
    }
 
    private String formatTypes(Map<Integer, Long> rows) {
        List<String> parts = new ArrayList<>();
        for (Map.Entry<Integer, Long> row : rows.entrySet()) {
            parts.add(resolveTaskType(row.getKey()) + " " + row.getValue() + " 条");
        }
        return String.join("，", parts);
    }
 
    private String formatLatestTasks(List<Task> tasks) {
        List<String> parts = new ArrayList<>();
        for (Task task : tasks) {
            parts.add((task.getTaskCode() == null ? "未命名任务" : task.getTaskCode())
                    + "（"
                    + resolveTaskType(task.getTaskType())
                    + "，"
                    + resolveTaskStatus(task.getTaskStatus())
                    + "，源库位 " + emptyToDash(task.getOrgLoc())
                    + "，目标库位 " + emptyToDash(task.getTargLoc())
                    + "）");
        }
        return String.join("；", parts);
    }
 
    private String resolveTaskStatus(Integer taskStatus) {
        if (taskStatus == null) {
            return "未知状态";
        }
        for (TaskStsType item : TaskStsType.values()) {
            if (item.id.equals(taskStatus)) {
                return item.desc;
            }
        }
        return "状态" + taskStatus;
    }
 
    private String resolveTaskType(Integer taskType) {
        if (taskType == null) {
            return "未知类型";
        }
        for (TaskType item : TaskType.values()) {
            if (item.type.equals(taskType)) {
                return item.desc;
            }
        }
        return "类型" + taskType;
    }
 
    private String emptyToDash(String value) {
        return value == null || value.trim().isEmpty() ? "-" : value;
    }
}