package com.campus.controller;

import com.campus.common.Result;
import com.campus.dto.response.VodUploadCredential;
import com.campus.service.VodService;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

/**
 * 阿里云 VOD 视频点播接口
 *
 * 上传流程：
 * 1. POST /api/vod/upload → 前端发送视频文件 → 后端 CreateUploadVideo + 上传到 VOD Bucket
 * 2. VOD 自动转码/审核 → 回调 POST /api/oss/vod-callback → 更新数据库
 *
 * 播放流程：
 * 3. GET /api/vod/play-auth/{videoId} → 获取 PlayAuth → 前端初始化播放器
 */
@Slf4j
@RestController
@RequestMapping("/api/vod")
@RequiredArgsConstructor
public class VodController {

    private final VodService vodService;

    /**
     * 上传视频到 VOD（一步完成：创建凭证 + 上传到 VOD Bucket）
     *
     * POST /api/vod/upload
     * Content-Type: multipart/form-data
     * 参数: file (视频文件)
     *
     * @return { videoId, requestId }
     */
    @PostMapping("/upload")
    public Result<Map<String, Object>> uploadVideo(@RequestParam("file") MultipartFile file) {
        if (file.isEmpty()) {
            return Result.error(400, "文件不能为空");
        }

        String fileName = file.getOriginalFilename();
        if (fileName == null) {
            fileName = "video.mp4";
        }

        try {
            // Step 1: 创建上传凭证（CreateUploadVideo）
            log.info("开始VOD上传: fileName={}, size={}MB", fileName,
                    String.format("%.1f", file.getSize() / 1024.0 / 1024.0));
            VodUploadCredential credential = vodService.createUploadVideo(fileName);

            // Step 2: 使用临时凭证上传到 VOD Bucket
            String videoId = vodService.uploadToVodBucket(
                    file.getInputStream(),
                    file.getSize(),
                    credential,
                    file.getContentType()
            );

            Map<String, Object> result = new HashMap<>();
            result.put("videoId", videoId);
            result.put("requestId", credential.getRequestId());

            log.info("VOD上传完成: videoId={}", videoId);
            return Result.success(result);

        } catch (IOException e) {
            log.error("VOD上传失败: 文件读取错误", e);
            return Result.error(500, "文件读取失败: " + e.getMessage());
        } catch (Exception e) {
            log.error("VOD上传失败: fileName={}", fileName, e);
            return Result.error(500, "视频上传失败: " + e.getMessage());
        }
    }

    /**
     * 上传图片到 VOD（一步完成：创建凭证 + 上传到 VOD Bucket）
     *
     * POST /api/vod/upload-image
     * Content-Type: multipart/form-data
     * 参数: file (图片文件)
     *
     * @return { imageId, imageUrl, requestId }
     */
    @PostMapping("/upload-image")
    public Result<Map<String, Object>> uploadImage(@RequestParam("file") MultipartFile file) {
        if (file.isEmpty()) {
            return Result.error(400, "文件不能为空");
        }

        String fileName = file.getOriginalFilename();
        if (fileName == null) {
            fileName = "image.jpg";
        }

        try {
            log.info("开始VOD图片上传: fileName={}, size={}KB", fileName,
                    String.format("%.1f", file.getSize() / 1024.0));

            // Step 1: 创建上传凭证（CreateUploadImage）
            VodUploadCredential credential = vodService.createUploadImage(fileName);

            // Step 2: 使用临时凭证上传到 VOD Bucket
            String imageId = vodService.uploadToVodBucket(
                    file.getInputStream(),
                    file.getSize(),
                    credential,
                    file.getContentType()
            );

            Map<String, Object> result = new HashMap<>();
            result.put("imageId", imageId);
            result.put("imageUrl", credential.getImageUrl());
            result.put("requestId", credential.getRequestId());

            log.info("VOD图片上传完成: imageId={}, imageUrl={}", imageId, credential.getImageUrl());
            return Result.success(result);

        } catch (IOException e) {
            log.error("VOD图片上传失败: 文件读取错误", e);
            return Result.error(500, "文件读取失败: " + e.getMessage());
        } catch (Exception e) {
            log.error("VOD图片上传失败: fileName={}", fileName, e);
            return Result.error(500, "图片上传失败: " + e.getMessage());
        }
    }

    /**
     * 创建上传凭证（用于前端直传场景 — 高级用法，需要前端集成 OSS SDK）
     *
     * POST /api/vod/create-upload
     * Body: { "fileName": "video.mp4" }
     *
     * 注意：React Native 环境下建议使用 POST /api/vod/upload，后端代理上传更稳定
     */
    @PostMapping("/create-upload")
    public Result<VodUploadCredential> createUpload(@RequestBody Map<String, String> body) {
        String fileName = body.getOrDefault("fileName", "video.mp4");

        try {
            VodUploadCredential credential = vodService.createUploadVideo(fileName);
            return Result.success(credential);
        } catch (Exception e) {
            log.error("创建上传凭证失败: fileName={}", fileName, e);
            return Result.error(500, "创建上传凭证失败: " + e.getMessage());
        }
    }

    /**
     * 刷新上传凭证（凭证有效期 3000 秒）
     *
     * POST /api/vod/refresh-upload/{videoId}
     */
    @PostMapping("/refresh-upload/{videoId}")
    public Result<VodUploadCredential> refreshUpload(@PathVariable String videoId) {
        try {
            VodUploadCredential credential = vodService.refreshUploadVideo(videoId);
            return Result.success(credential);
        } catch (Exception e) {
            log.error("刷新上传凭证失败: videoId={}", videoId, e);
            return Result.error(500, "刷新上传凭证失败: " + e.getMessage());
        }
    }

    /**
     * 获取视频播放凭证（PlayAuth — 安全播放）
     *
     * GET /api/vod/play-auth/{videoId}
     *
     * 返回 PlayAuth，前端用它初始化阿里云播放器 SDK
     * 同时返回视频元信息（封面、时长等）
     */
    @GetMapping("/play-auth/{videoId}")
    public Result<Map<String, Object>> getPlayAuth(@PathVariable String videoId) {
        try {
            String playAuth = vodService.getPlayAuth(videoId);
            Map<String, Object> playInfo = vodService.getPlayInfo(videoId);

            Map<String, Object> result = new HashMap<>();
            result.put("videoId", videoId);
            result.put("playAuth", playAuth);
            result.put("coverUrl", playInfo.get("coverUrl"));
            result.put("duration", playInfo.get("duration"));

            return Result.success(result);
        } catch (Exception e) {
            log.error("获取播放凭证失败: videoId={}", videoId, e);
            return Result.error(500, "获取播放凭证失败: " + e.getMessage());
        }
    }

    /**
     * 获取视频播放地址（简单场景，直接返回 m3u8 URL）
     *
     * GET /api/vod/play-info/{videoId}
     */
    @GetMapping("/play-info/{videoId}")
    public Result<Map<String, Object>> getPlayInfo(@PathVariable String videoId) {
        try {
            Map<String, Object> playInfo = vodService.getPlayInfo(videoId);
            return Result.success(playInfo);
        } catch (Exception e) {
            log.error("获取播放信息失败: videoId={}", videoId, e);
            return Result.error(500, "获取播放信息失败: " + e.getMessage());
        }
    }
}