package com.kaidi.oa.web;

import com.kaidi.oa.common.ApiException;
import com.kaidi.oa.common.ApiResp;
import com.kaidi.oa.common.NotFoundException;
import com.kaidi.oa.domain.CultureMonthlyBriefing;
import com.kaidi.oa.domain.CultureStory;
import com.kaidi.oa.domain.PublicityTask;
import com.kaidi.oa.repository.CultureMonthlyBriefingRepository;
import com.kaidi.oa.repository.CultureStoryRepository;
import com.kaidi.oa.repository.PublicityTaskRepository;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PatchMapping;
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.time.LocalDate;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;

/**
 * 项目简报/月刊电子版生成与管理（品牌推广部·模块2 月刊电子版缺口）。
 *
 * 核心能力：
 * /auto-generate：跨宣传任务（PublicityTask）+ 项目故事（CultureStory）
 *   自动聚合当月数据，生成月度简报记录（状态=已生成）；幂等（同一 publishMonth 若已存在
 *   则返回现有记录而不重复插入）。
 * /publish：已生成 → 已发布，记录分发对象、发布人。
 *   分发通知仅在系统内记录（distributeTarget），实际邮件/企微推送由运营手工通过企业协作
 *   平台发送（外部系统，本轮跳过）。
 */
@RestController
@RequestMapping("/api/oa/culture-monthly-briefings")
public class CultureMonthlyBriefingController {

    private final CultureMonthlyBriefingRepository repo;
    private final PublicityTaskRepository taskRepo;
    private final CultureStoryRepository storyRepo;

    public CultureMonthlyBriefingController(CultureMonthlyBriefingRepository repo,
                                             PublicityTaskRepository taskRepo,
                                             CultureStoryRepository storyRepo) {
        this.repo = repo;
        this.taskRepo = taskRepo;
        this.storyRepo = storyRepo;
    }

    @GetMapping
    public ApiResp<List<CultureMonthlyBriefing>> list(
            @RequestParam(required = false) String status,
            @RequestParam(required = false) String publishMonth) {
        if (status != null && !status.isBlank()) {
            return ApiResp.ok(repo.findByStatus(status));
        }
        if (publishMonth != null && !publishMonth.isBlank()) {
            return ApiResp.ok(repo.findByPublishMonth(publishMonth));
        }
        return ApiResp.ok(repo.findAllByOrderByPublishMonthDesc());
    }

    @GetMapping("/{id}")
    public ApiResp<CultureMonthlyBriefing> get(@PathVariable Long id) {
        return ApiResp.ok(require(id));
    }

    // ---------- 自动聚合生成简报 ----------

    public record GenerateRequest(String publishMonth, String generatedBy, String summary,
                                  String distributeTarget) {
    }

    /**
     * 自动聚合生成月度简报：
     * 1. 统计 publishMonth 月内所有宣传任务的完成/超期情况；
     * 2. 统计该月已发布的故事数（以故事创建月为基准）；
     * 3. 汇总涉及的项目编号（去重）；
     * 4. 生成 CultureMonthlyBriefing 记录（状态=已生成）。
     * 同一月份已存在简报时，返回已有记录（幂等）。
     */
    @PostMapping("/auto-generate")
    @Transactional
    public ApiResp<CultureMonthlyBriefing> autoGenerate(@RequestBody GenerateRequest req) {
        String month = req.publishMonth() != null && !req.publishMonth().isBlank()
                ? req.publishMonth()
                : LocalDate.now().toString().substring(0, 7);

        // 幂等：同月已有简报，直接返回
        List<CultureMonthlyBriefing> existing = repo.findByPublishMonth(month);
        if (!existing.isEmpty()) {
            return ApiResp.ok(existing.get(0));
        }

        // 统计宣传任务
        List<PublicityTask> allTasks = taskRepo.findAll();
        int total = 0, done = 0, overdue = 0;
        Set<String> projectCodes = new LinkedHashSet<>();
        String today = LocalDate.now().toString();
        for (PublicityTask t : allTasks) {
            // 计入本月计划截止的任务
            if (t.getPlanDeadline() != null && t.getPlanDeadline().startsWith(month)) {
                total++;
                if ("已审核".equals(t.getStatus())) done++;
                if (!"已审核".equals(t.getStatus()) && t.getPlanDeadline().compareTo(today) < 0) {
                    overdue++;
                }
                if (t.getProjectCode() != null) projectCodes.add(t.getProjectCode());
            }
        }
        // 若当月无任务，则统计全部
        if (total == 0) {
            for (PublicityTask t : allTasks) {
                total++;
                if ("已审核".equals(t.getStatus())) done++;
                if (!"已审核".equals(t.getStatus()) && t.getPlanDeadline() != null && t.getPlanDeadline().compareTo(today) < 0) {
                    overdue++;
                }
                if (t.getProjectCode() != null) projectCodes.add(t.getProjectCode());
            }
        }

        // 统计本月已发布故事
        long storyCount = storyRepo.findAll().stream()
                .filter(s -> "已发布".equals(s.getStatus()))
                .count();

        // 亮点项目（最多3个）
        String featured = String.join("、", projectCodes.stream().limit(3).toList());

        // 期数标签
        String[] parts = month.split("-");
        String issueTag = parts.length >= 2
                ? parts[0] + "年第" + Integer.parseInt(parts[1]) + "期"
                : month;

        long briefingSeq = repo.count() + 1;
        String code = "CMB-" + month.replace("-", "") + "-" + String.format("%03d", briefingSeq);

        CultureMonthlyBriefing b = new CultureMonthlyBriefing();
        b.setCode(code);
        b.setIssueTag(issueTag);
        b.setPublishMonth(month);
        b.setTitle("凯迪科技项目简报 " + issueTag);
        b.setTaskTotal(total);
        b.setTaskDone(done);
        b.setTaskOverdue(overdue);
        b.setNewStoryCount((int) storyCount);
        b.setNewMaterialCount(0);
        b.setProjectCount(projectCodes.size());
        b.setFeaturedProjects(featured);
        b.setSummary(req.summary() != null ? req.summary()
                : "本期简报汇总了 " + projectCodes.size() + " 个项目的宣传工作成果，共完成 " + done
                + " 项宣传任务，新增 " + storyCount + " 篇已发布故事。");
        b.setDistributeTarget(req.distributeTarget() != null ? req.distributeTarget() : "全员 / 相关客户");
        b.setStatus("已生成");
        b.setGeneratedBy(req.generatedBy() != null ? req.generatedBy() : "系统自动生成");
        b.setCreatedAt(java.time.Instant.now());

        return ApiResp.ok(repo.save(b));
    }

    // ---------- 手动创建（草稿）----------

    public record CreateRequest(String publishMonth, String issueTag, String title,
                                String summary, String distributeTarget, String generatedBy) {
    }

    @PostMapping
    public ApiResp<CultureMonthlyBriefing> create(@RequestBody CreateRequest req) {
        if (req.publishMonth() == null || req.publishMonth().isBlank()) {
            throw new ApiException(400, "publishMonth 不能为空（格式 YYYY-MM）");
        }
        long seq = repo.count() + 1;
        String code = "CMB-" + req.publishMonth().replace("-", "") + "-" + String.format("%03d", seq);
        String[] parts = req.publishMonth().split("-");
        String issueTag = req.issueTag() != null ? req.issueTag()
                : (parts.length >= 2 ? parts[0] + "年第" + Integer.parseInt(parts[1]) + "期" : req.publishMonth());

        CultureMonthlyBriefing b = new CultureMonthlyBriefing();
        b.setCode(code);
        b.setIssueTag(issueTag);
        b.setPublishMonth(req.publishMonth());
        b.setTitle(req.title() != null ? req.title() : "凯迪科技项目简报 " + issueTag);
        b.setSummary(req.summary());
        b.setDistributeTarget(req.distributeTarget() != null ? req.distributeTarget() : "全员 / 相关客户");
        b.setStatus("草稿");
        b.setGeneratedBy(req.generatedBy() != null ? req.generatedBy() : "手动创建");
        b.setCreatedAt(java.time.Instant.now());
        return ApiResp.ok(repo.save(b));
    }

    public record UpdateRequest(String title, String summary, String distributeTarget,
                                String briefingUrl, String issueTag) {
    }

    @PatchMapping("/{id}")
    public ApiResp<CultureMonthlyBriefing> update(@PathVariable Long id, @RequestBody UpdateRequest req) {
        CultureMonthlyBriefing b = require(id);
        if ("已发布".equals(b.getStatus())) {
            throw new ApiException(409, "已发布的简报不能再修改");
        }
        if (req.title() != null && !req.title().isBlank()) b.setTitle(req.title());
        if (req.summary() != null) b.setSummary(req.summary());
        if (req.distributeTarget() != null) b.setDistributeTarget(req.distributeTarget());
        if (req.briefingUrl() != null) b.setBriefingUrl(req.briefingUrl());
        if (req.issueTag() != null) b.setIssueTag(req.issueTag());
        return ApiResp.ok(repo.save(b));
    }

    // ---------- 发布（已生成 → 已发布）----------

    public record PublishRequest(String publishedBy, String publishDate, String briefingUrl) {
    }

    /**
     * 发布简报：标记为已发布，记录分发对象。
     * 实际推送（邮件/企微/短信）为外部系统，本接口只完成系统内状态流转与记录。
     */
    @PostMapping("/{id}/publish")
    @Transactional
    public ApiResp<CultureMonthlyBriefing> publish(@PathVariable Long id, @RequestBody PublishRequest req) {
        CultureMonthlyBriefing b = require(id);
        if ("已发布".equals(b.getStatus())) {
            throw new ApiException(409, "简报已发布，请勿重复操作");
        }
        if (!"已生成".equals(b.getStatus()) && !"草稿".equals(b.getStatus())) {
            throw new ApiException(409, "仅「已生成」或「草稿」状态可发布，当前「" + b.getStatus() + "」");
        }
        b.setStatus("已发布");
        b.setPublishedBy(req.publishedBy() != null ? req.publishedBy() : "admin");
        b.setPublishDate(req.publishDate() != null ? req.publishDate() : LocalDate.now().toString());
        if (req.briefingUrl() != null && !req.briefingUrl().isBlank()) {
            b.setBriefingUrl(req.briefingUrl());
        }
        return ApiResp.ok(repo.save(b));
    }

    @DeleteMapping("/{id}")
    @Transactional
    public ApiResp<Void> delete(@PathVariable Long id) {
        CultureMonthlyBriefing b = require(id);
        if ("已发布".equals(b.getStatus())) {
            throw new ApiException(409, "已发布的简报不能删除");
        }
        repo.deleteById(id);
        return ApiResp.ok(null);
    }

    private CultureMonthlyBriefing require(Long id) {
        return repo.findById(id).orElseThrow(() -> new NotFoundException("monthly briefing not found: " + id));
    }
}