package com.music.controller;

import com.music.common.Result;
import com.music.dto.DedupRequest;
import com.music.exception.BusinessException;
import com.music.service.DedupService;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.*;

import javax.validation.Valid;
import java.util.UUID;

/**
 * 音乐去重任务控制器
 */
@RestController
@RequestMapping("/api/dedup")
@Validated
public class DedupController {

    private final DedupService dedupService;

    public DedupController(DedupService dedupService) {
        this.dedupService = dedupService;
    }

    /**
     * 启动音乐去重任务
     */
    @PostMapping("/start")
    public Result<StartResponse> start(@Valid @RequestBody DedupRequest request) {
        // 模式校验
        if (!"copy".equalsIgnoreCase(request.getMode()) &&
                !"move".equalsIgnoreCase(request.getMode())) {
            throw new BusinessException(400, "模式参数错误，必须是 copy 或 move");
        }

        // 至少启用一种策略
        if (!request.isUseMd5() && !request.isUseMetadata()) {
            throw new BusinessException(400, "至少需要启用一种去重策略（MD5 或元数据匹配）");
        }

        String taskId = UUID.randomUUID().toString();
        dedupService.dedup(
                taskId,
                request.getLibraryDir(),
                request.getTrashDir(),
                request.isUseMd5(),
                request.isUseMetadata(),
                request.getMode()
        );

        return Result.success(new StartResponse(taskId));
    }

    public static class StartResponse {
        private String taskId;

        public StartResponse(String taskId) {
            this.taskId = taskId;
        }

        public String getTaskId() {
            return taskId;
        }

        public void setTaskId(String taskId) {
            this.taskId = taskId;
        }
    }
}