package com.agent.management.controller;

import com.agent.management.common.Result;
import com.agent.management.engine.WorkflowEngine;
import com.agent.management.engine.WorkflowRunRequest;
import com.agent.management.model.entity.Workflow;
import com.agent.management.model.vo.PageResult;
import com.agent.management.model.vo.WorkflowVO;
import com.agent.management.repository.WfCategoryRepository;
import com.agent.management.service.TagService;
import com.agent.management.service.WfCategoryService;
import com.agent.management.service.WorkflowService;
import lombok.Data;
import lombok.RequiredArgsConstructor;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.servlet.mvc.method.annotation.SseEmitter;

import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

@RestController
@RequestMapping("/api/workflows")
@RequiredArgsConstructor
public class WorkflowController {

    private final WorkflowService workflowService;
    private final WorkflowEngine workflowEngine;
    private final TagService tagService;
    private final WfCategoryRepository wfCategoryRepository;
    private final WfCategoryService wfCategoryService;

    @GetMapping
    public Result<PageResult<WorkflowVO>> list(
            @RequestParam(required = false) String search,
            @RequestParam(required = false) Long categoryId,
            @RequestParam(defaultValue = "1") int page,
            @RequestParam(defaultValue = "12") int size) {

        List<Workflow> all = workflowService.listWorkflows();

        // 搜索过滤
        if (search != null && !search.trim().isEmpty()) {
            String kw = search.trim().toLowerCase();
            all = all.stream()
                    .filter(wf -> (wf.getName() != null && wf.getName().toLowerCase().contains(kw))
                            || (wf.getDescription() != null && wf.getDescription().toLowerCase().contains(kw)))
                    .collect(Collectors.toList());
        }

        // 分类过滤（含子孙分类）
        if (categoryId != null) {
            List<Long> catIds = new ArrayList<>();
            catIds.add(categoryId);
            catIds.addAll(wfCategoryService.getDescendantCategoryIds(categoryId));
            all = all.stream()
                    .filter(wf -> wf.getCategoryId() != null && catIds.contains(wf.getCategoryId()))
                    .collect(Collectors.toList());
        }

        int total = all.size();
        int totalPages = Math.max(1, (int) Math.ceil((double) total / size));
        if (page > totalPages) page = totalPages;
        int from = (page - 1) * size;
        int to = Math.min(from + size, total);
        List<Workflow> pageData = from < total ? all.subList(from, to) : List.of();

        List<WorkflowVO> voList = pageData.stream().map(this::toVO).collect(Collectors.toList());
        return Result.success(PageResult.of(voList, total, page, size));
    }

    @GetMapping("/{id}")
    public Result<WorkflowVO> get(@PathVariable Long id) {
        Workflow wf = workflowService.getWorkflow(id);
        return Result.success(toVO(wf));
    }

    @PostMapping
    public Result<WorkflowVO> create(@RequestBody CreateWorkflowReq req) {
        Workflow wf = workflowService.createWorkflow(req.getName(), req.getDescription());
        return Result.success(toVO(wf));
    }

    @PostMapping("/{id}/save")
    public Result<WorkflowVO> save(@PathVariable Long id, @RequestBody SaveWorkflowReq req) {
        Workflow wf = workflowService.updateWorkflow(id, req.getName(), req.getDescription(), req.getGraphData());
        return Result.success(toVO(wf));
    }

    @PostMapping("/{id}/delete")
    public Result<Void> delete(@PathVariable Long id) {
        workflowService.deleteWorkflow(id);
        return Result.success(null);
    }

    /** 设置工作流分类 */
    @PutMapping("/{id}/category")
    public Result<Void> setCategory(@PathVariable Long id, @RequestBody SetCategoryReq req) {
        Workflow wf = workflowService.getWorkflow(id);
        wf.setCategoryId(req.getCategoryId());
        workflowService.updateWorkflow(wf.getId(), wf.getName(), wf.getDescription(), wf.getGraphData());
        return Result.success(null);
    }

    /**
     * 运行工作流（SSE 实时推送执行状态）
     */
    @PostMapping(value = "/{id}/run", produces = MediaType.TEXT_EVENT_STREAM_VALUE)
    public SseEmitter run(@PathVariable Long id, @RequestBody WorkflowRunRequest req) {
        SseEmitter emitter = new SseEmitter(600_000L); // 10 分钟超时
        workflowEngine.executeAsync(id, req.getInputs(), emitter);
        return emitter;
    }

    private WorkflowVO toVO(Workflow wf) {
        WorkflowVO vo = WorkflowVO.from(wf);
        vo.setTags(tagService.getEntityTags("workflow", String.valueOf(wf.getId())));
        // 填充分类名称
        if (wf.getCategoryId() != null) {
            wfCategoryRepository.findById(wf.getCategoryId())
                    .ifPresent(cat -> vo.setCategoryName(cat.getName()));
        }
        return vo;
    }

    @Data
    public static class CreateWorkflowReq {
        private String name;
        private String description;
    }

    @Data
    public static class SaveWorkflowReq {
        private String name;
        private String description;
        private String graphData;
    }

    @Data
    public static class SetCategoryReq {
        private Long categoryId;
    }
}