using FileService.Application.UploadFile;
using FileService.Infrastructure;
using IM.ASPNETCore;
using IM.Commons;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using System.Security.Claims;

namespace FileService.WebApi.Controllers.File
{
    [Authorize]
    [Route("api/[controller]")]
    [ApiController]
    public class FileController : ControllerBase
    {
        private readonly UploadFileService service;

        public FileController(UploadFileService service)
        {
            this.service = service;
        }

        /// <summary>
        /// 单次直传（小文件：头像/封面等）。isPublic=true 落公开桶，返回直链。
        /// 支持秒传：若相同 checksum 的文件已存在，直接返回已有记录，跳过上传。
        /// </summary>
        [HttpPost("simple-upload")]
        [UnitOfWork(typeof(FileDbContext))]
        public async Task<IActionResult> SimpleUpload([FromForm] IFormFile file, [FromForm] bool isPublic)
        {
            if (file == null || file.Length == 0)
            {
                return BadRequest();
            }

            var userId = User.FindFirstValue(ClaimTypes.NameIdentifier);
            await using var stream = file.OpenReadStream();
            var res = await service.SimpleUploadAsync(new SimpleUploadCommand(
                OwnerId: Guid.Parse(userId),
                FileName: file.FileName,
                ContentType: file.ContentType,
                FileSize: file.Length,
                Content: stream,
                IsPublic: isPublic));
            return Ok(res);
        }

        /// <summary>
        /// 获取文件信息（含直链 Url；私有文件 Url 为 null）。
        /// </summary>
        [HttpGet("{id}")]
        public async Task<IActionResult> Get(Guid id)
        {
            var userId = User.FindFirstValue(ClaimTypes.NameIdentifier);
            var res = await service.GetFileInfoAsync(id, Guid.Parse(userId));
            return Ok(res);
        }

        /// <summary>
        /// 鉴权下载文件内容（私有文件预览/下载走这里）。
        /// </summary>
        [HttpGet("{id}/content")]
        public async Task<IActionResult> GetContent(Guid id)
        {
            var userId = User.FindFirstValue(ClaimTypes.NameIdentifier);
            var res = await service.OpenDownloadAsync(id, Guid.Parse(userId));
            if (res.Data == null)
            {
                if (res.Code == (int)ResultCode.PERMISSION_DENIED)
                {
                    return StatusCode(StatusCodes.Status403Forbidden, res);
                }
                return NotFound(res);
            }

            Response.Headers["Cache-Control"] = "private,max-age=86400";
            return File(res.Data.Content, res.Data.ContentType, enableRangeProcessing: true);
        }
    }
}