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.ContentTask;
import com.kaidi.oa.repository.ContentTaskRepository;
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.Instant;
import java.util.List;

/**
 * 品牌推广部·内容创作任务分发（内容创作与审核发布·任务分发子功能）。
 *
 * 补全缺口：ContentPiece 仅有 author 字段，无独立 ContentTask 实体/控制器，
 * 无任务指派给供应商的关联机制。
 *
 * 功能：
 * 1. 内容创作任务 CRUD（文案/设计/视频，指派内部员工或外部供应商）
 * 2. 状态机：待接受 → 进行中 → 待审核 → 已发布 / 已驳回
 * 3. 任务列表支持按状态/类型/指派类型过滤
 * 4. 完成后可关联 ContentPiece 稿件（contentCode/contentId）形成追溯链
 */
@RestController
@RequestMapping("/api/oa/content-tasks")
public class ContentTaskController {

    private final ContentTaskRepository taskRepo;

    public ContentTaskController(ContentTaskRepository taskRepo) {
        this.taskRepo = taskRepo;
    }

    // ---------- 任务台账 ----------

    @GetMapping
    public ApiResp<List<ContentTask>> list(
            @RequestParam(required = false) String status,
            @RequestParam(required = false) String taskType,
            @RequestParam(required = false) String assigneeType) {
        if (status != null && !status.isBlank()) {
            return ApiResp.ok(taskRepo.findByStatus(status));
        }
        if (taskType != null && !taskType.isBlank()) {
            return ApiResp.ok(taskRepo.findByTaskType(taskType));
        }
        if (assigneeType != null && !assigneeType.isBlank()) {
            return ApiResp.ok(taskRepo.findByAssigneeType(assigneeType));
        }
        return ApiResp.ok(taskRepo.findAll());
    }

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

    public record TaskRequest(
            String code, String title, String contentCode, Long contentId,
            String taskType, String description, String assigneeType,
            String assignee, String supplierCode, String dueDate, String issuedBy) {
    }

    @PostMapping
    public ApiResp<ContentTask> create(@RequestBody TaskRequest req) {
        if (req.title() == null || req.title().isBlank()) {
            throw new ApiException(400, "任务标题(title) 不能为空");
        }
        if (req.assignee() == null || req.assignee().isBlank()) {
            throw new ApiException(400, "指派对象(assignee) 不能为空");
        }
        ContentTask t = new ContentTask();
        t.setCode(req.code() == null || req.code().isBlank()
                ? "CT-" + (taskRepo.count() + 1) : req.code());
        t.setTitle(req.title());
        t.setContentCode(req.contentCode());
        t.setContentId(req.contentId());
        t.setTaskType(req.taskType() == null || req.taskType().isBlank() ? "文案" : req.taskType());
        t.setDescription(req.description());
        t.setAssigneeType(req.assigneeType() == null || req.assigneeType().isBlank() ? "内部员工" : req.assigneeType());
        t.setAssignee(req.assignee());
        t.setSupplierCode(req.supplierCode());
        t.setDueDate(req.dueDate());
        t.setIssuedBy(req.issuedBy());
        t.setStatus("待接受");
        t.setCreatedAt(Instant.now());
        return ApiResp.ok(taskRepo.save(t));
    }

    @PatchMapping("/{id}")
    public ApiResp<ContentTask> update(@PathVariable Long id, @RequestBody TaskRequest req) {
        ContentTask t = find(id);
        if ("已发布".equals(t.getStatus())) {
            throw new ApiException(409, "已发布的任务不可编辑");
        }
        if (req.title() != null && !req.title().isBlank()) t.setTitle(req.title());
        if (req.contentCode() != null) t.setContentCode(req.contentCode());
        if (req.contentId() != null) t.setContentId(req.contentId());
        if (req.taskType() != null && !req.taskType().isBlank()) t.setTaskType(req.taskType());
        if (req.description() != null) t.setDescription(req.description());
        if (req.assigneeType() != null && !req.assigneeType().isBlank()) t.setAssigneeType(req.assigneeType());
        if (req.assignee() != null && !req.assignee().isBlank()) t.setAssignee(req.assignee());
        if (req.supplierCode() != null) t.setSupplierCode(req.supplierCode());
        if (req.dueDate() != null) t.setDueDate(req.dueDate());
        return ApiResp.ok(taskRepo.save(t));
    }

    @DeleteMapping("/{id}")
    public ApiResp<Void> delete(@PathVariable Long id) {
        ContentTask t = find(id);
        if (!"待接受".equals(t.getStatus()) && !"已驳回".equals(t.getStatus())) {
            throw new ApiException(409, "仅待接受/已驳回状态可删除");
        }
        taskRepo.deleteById(id);
        return ApiResp.ok(null);
    }

    // ---------- 状态机 ----------

    /** 接受任务：待接受 → 进行中。 */
    @PostMapping("/{id}/accept")
    public ApiResp<ContentTask> accept(@PathVariable Long id) {
        ContentTask t = find(id);
        if (!"待接受".equals(t.getStatus())) {
            throw new ApiException(409, "仅待接受状态可接受，当前「" + t.getStatus() + "」");
        }
        t.setStatus("进行中");
        return ApiResp.ok(taskRepo.save(t));
    }

    public record SubmitDeliverableRequest(String deliverableUrl, String contentCode, Long contentId) {
    }

    /** 提交交付物：进行中 → 待审核，关联稿件。 */
    @PostMapping("/{id}/submit")
    @Transactional
    public ApiResp<ContentTask> submit(@PathVariable Long id,
                                       @RequestBody(required = false) SubmitDeliverableRequest req) {
        ContentTask t = find(id);
        if (!"进行中".equals(t.getStatus())) {
            throw new ApiException(409, "仅进行中可提交交付物，当前「" + t.getStatus() + "」");
        }
        if (req != null) {
            if (req.deliverableUrl() != null) t.setDeliverableUrl(req.deliverableUrl());
            if (req.contentCode() != null) t.setContentCode(req.contentCode());
            if (req.contentId() != null) t.setContentId(req.contentId());
        }
        t.setStatus("待审核");
        return ApiResp.ok(taskRepo.save(t));
    }

    public record ReviewRequest(String reviewNote) {
    }

    /** 审核通过：待审核 → 已发布。 */
    @PostMapping("/{id}/approve")
    public ApiResp<ContentTask> approve(@PathVariable Long id,
                                        @RequestBody(required = false) ReviewRequest req) {
        ContentTask t = find(id);
        if (!"待审核".equals(t.getStatus())) {
            throw new ApiException(409, "仅待审核可通过，当前「" + t.getStatus() + "」");
        }
        if (req != null && req.reviewNote() != null) t.setReviewNote(req.reviewNote());
        t.setStatus("已发布");
        return ApiResp.ok(taskRepo.save(t));
    }

    /** 驳回：待审核 → 已驳回（驳回后可重新提交，状态回进行中需手动再接受）。 */
    @PostMapping("/{id}/reject")
    public ApiResp<ContentTask> reject(@PathVariable Long id,
                                       @RequestBody(required = false) ReviewRequest req) {
        ContentTask t = find(id);
        if (!"待审核".equals(t.getStatus())) {
            throw new ApiException(409, "仅待审核可驳回，当前「" + t.getStatus() + "」");
        }
        if (req != null && req.reviewNote() != null) t.setReviewNote(req.reviewNote());
        t.setStatus("已驳回");
        return ApiResp.ok(taskRepo.save(t));
    }

    /** 驳回后重新接受：已驳回 → 进行中。 */
    @PostMapping("/{id}/restart")
    public ApiResp<ContentTask> restart(@PathVariable Long id) {
        ContentTask t = find(id);
        if (!"已驳回".equals(t.getStatus())) {
            throw new ApiException(409, "仅已驳回任务可重启，当前「" + t.getStatus() + "」");
        }
        t.setStatus("进行中");
        return ApiResp.ok(taskRepo.save(t));
    }

    // ---------- 内部工具 ----------

    private ContentTask find(Long id) {
        return taskRepo.findById(id)
                .orElseThrow(() -> new NotFoundException("content task not found: " + id));
    }
}