package transport

import (
	"fmt"
	"net/http"
	"strconv"
	"strings"

	"github.com/gin-gonic/gin"

	"github.com/geo-platform/tenant-api/internal/ops/app"
	"github.com/geo-platform/tenant-api/internal/shared/response"
)

type desktopClientReleaseRequest struct {
	Platform                 string  `json:"platform" binding:"required"`
	Arch                     string  `json:"arch"`
	Channel                  string  `json:"channel"`
	Version                  string  `json:"version" binding:"required"`
	MinSupportedVersion      *string `json:"min_supported_version"`
	DownloadSource           string  `json:"download_source"`
	OSSObjectKey             *string `json:"oss_object_key"`
	CustomDownloadURL        *string `json:"custom_download_url"`
	FileName                 *string `json:"file_name"`
	FileSizeBytes            *int64  `json:"file_size_bytes"`
	SHA256                   *string `json:"sha256"`
	UpdaterDownloadSource    *string `json:"updater_download_source"`
	UpdaterOSSObjectKey      *string `json:"updater_oss_object_key"`
	UpdaterCustomDownloadURL *string `json:"updater_custom_download_url"`
	UpdaterFileName          *string `json:"updater_file_name"`
	UpdaterFileSizeBytes     *int64  `json:"updater_file_size_bytes"`
	UpdaterSHA256            *string `json:"updater_sha256"`
	ReleaseNotes             *string `json:"release_notes"`
	ForceUpdate              bool    `json:"force_update"`
	Enabled                  *bool   `json:"enabled"`
}

type setDesktopClientReleaseEnabledRequest struct {
	Enabled bool `json:"enabled"`
}

type desktopClientReleaseUploadInitRequest struct {
	Platform       string `json:"platform" binding:"required"`
	Arch           string `json:"arch"`
	Channel        string `json:"channel"`
	Version        string `json:"version" binding:"required"`
	Kind           string `json:"kind"`
	FileName       string `json:"file_name" binding:"required"`
	FileSizeBytes  int64  `json:"file_size_bytes" binding:"required"`
	ChunkSizeBytes int64  `json:"chunk_size_bytes"`
}

func listDesktopClientReleasesHandler(svc *app.DesktopClientReleaseService) gin.HandlerFunc {
	return func(c *gin.Context) {
		page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
		size, _ := strconv.Atoi(c.DefaultQuery("size", "20"))
		result, err := svc.List(c.Request.Context(), app.DesktopClientReleaseListInput{
			Keyword:  c.Query("keyword"),
			Platform: c.Query("platform"),
			Channel:  c.Query("channel"),
			Enabled:  parseOptionalBoolQuery(c.Query("enabled")),
			Page:     page,
			Size:     size,
		})
		if err != nil {
			response.Error(c, err)
			return
		}
		response.Success(c, result)
	}
}

func createDesktopClientReleaseHandler(svc *app.DesktopClientReleaseService) gin.HandlerFunc {
	return func(c *gin.Context) {
		var body desktopClientReleaseRequest
		if err := c.ShouldBindJSON(&body); err != nil {
			response.Error(c, response.ErrBadRequest(40000, "invalid_payload", err.Error()))
			return
		}
		result, err := svc.Create(c.Request.Context(), actorFromGin(c), body.toInput())
		if err != nil {
			response.Error(c, err)
			return
		}
		response.Success(c, result)
	}
}

func updateDesktopClientReleaseHandler(svc *app.DesktopClientReleaseService) gin.HandlerFunc {
	return func(c *gin.Context) {
		id, err := parseIDParam(c)
		if err != nil {
			response.Error(c, err)
			return
		}
		var body desktopClientReleaseRequest
		if err := c.ShouldBindJSON(&body); err != nil {
			response.Error(c, response.ErrBadRequest(40000, "invalid_payload", err.Error()))
			return
		}
		result, err := svc.Update(c.Request.Context(), actorFromGin(c), id, body.toInput())
		if err != nil {
			response.Error(c, err)
			return
		}
		response.Success(c, result)
	}
}

func setDesktopClientReleaseEnabledHandler(svc *app.DesktopClientReleaseService) gin.HandlerFunc {
	return func(c *gin.Context) {
		id, err := parseIDParam(c)
		if err != nil {
			response.Error(c, err)
			return
		}
		var body setDesktopClientReleaseEnabledRequest
		if err := c.ShouldBindJSON(&body); err != nil {
			response.Error(c, response.ErrBadRequest(40000, "invalid_payload", err.Error()))
			return
		}
		result, err := svc.SetEnabled(c.Request.Context(), actorFromGin(c), id, body.Enabled)
		if err != nil {
			response.Error(c, err)
			return
		}
		response.Success(c, result)
	}
}

func deleteDesktopClientReleaseHandler(svc *app.DesktopClientReleaseService) gin.HandlerFunc {
	return func(c *gin.Context) {
		id, err := parseIDParam(c)
		if err != nil {
			response.Error(c, err)
			return
		}
		if err := svc.Delete(c.Request.Context(), actorFromGin(c), id); err != nil {
			response.Error(c, err)
			return
		}
		response.Success(c, gin.H{"id": id})
	}
}

func resolveDesktopClientReleaseDownloadURLHandler(svc *app.DesktopClientReleaseService) gin.HandlerFunc {
	return func(c *gin.Context) {
		id, err := parseIDParam(c)
		if err != nil {
			response.Error(c, err)
			return
		}
		result, err := svc.ResolveDownloadURLByID(c.Request.Context(), id)
		if err != nil {
			response.Error(c, err)
			return
		}
		response.Success(c, result)
	}
}

func uploadDesktopClientReleaseHandler(svc *app.DesktopClientReleaseService) gin.HandlerFunc {
	return func(c *gin.Context) {
		if c.Request.ContentLength > app.MaxDesktopClientReleaseMultipartBytes() {
			response.Error(c, response.ErrBadRequest(40072, "release_file_too_large", "客户端安装包不能超过 1GB"))
			return
		}
		c.Request.Body = http.MaxBytesReader(c.Writer, c.Request.Body, app.MaxDesktopClientReleaseMultipartBytes())

		fileHeader, err := c.FormFile("file")
		if err != nil {
			if strings.Contains(err.Error(), "request body too large") {
				response.Error(c, response.ErrBadRequest(40072, "release_file_too_large", "客户端安装包不能超过 1GB"))
				return
			}
			response.Error(c, response.ErrBadRequest(40071, "release_file_required", "请选择要上传的客户端安装包"))
			return
		}
		if c.Request.MultipartForm != nil {
			defer c.Request.MultipartForm.RemoveAll()
		}
		if fileHeader.Size > app.MaxDesktopClientReleaseUploadBytes {
			response.Error(c, response.ErrBadRequest(40072, "release_file_too_large", "客户端安装包不能超过 1GB"))
			return
		}
		file, err := fileHeader.Open()
		if err != nil {
			response.Error(c, response.ErrBadRequest(40071, "release_file_open_failed", "客户端安装包读取失败"))
			return
		}
		defer file.Close()

		result, err := svc.UploadOSS(c.Request.Context(), app.DesktopClientReleaseUploadInput{
			Platform:         c.PostForm("platform"),
			Arch:             c.PostForm("arch"),
			Channel:          c.PostForm("channel"),
			Version:          c.PostForm("version"),
			Kind:             c.DefaultPostForm("kind", app.DesktopClientAssetKindInstaller),
			FileName:         fileHeader.Filename,
			ContentReader:    file,
			ContentSizeBytes: fileHeader.Size,
		})
		if err != nil {
			response.Error(c, err)
			return
		}
		response.Success(c, result)
	}
}

func initiateDesktopClientReleaseUploadHandler(svc *app.DesktopClientReleaseService) gin.HandlerFunc {
	return func(c *gin.Context) {
		var body desktopClientReleaseUploadInitRequest
		if err := c.ShouldBindJSON(&body); err != nil {
			response.Error(c, response.ErrBadRequest(40000, "invalid_payload", err.Error()))
			return
		}
		result, err := svc.InitiateChunkedUpload(c.Request.Context(), app.DesktopClientReleaseChunkedUploadInitInput{
			Platform:       body.Platform,
			Arch:           body.Arch,
			Channel:        body.Channel,
			Version:        body.Version,
			Kind:           body.Kind,
			FileName:       body.FileName,
			FileSizeBytes:  body.FileSizeBytes,
			ChunkSizeBytes: body.ChunkSizeBytes,
		})
		if err != nil {
			response.Error(c, err)
			return
		}
		response.Success(c, result)
	}
}

func uploadDesktopClientReleaseChunkHandler(svc *app.DesktopClientReleaseService) gin.HandlerFunc {
	return func(c *gin.Context) {
		if c.Request.ContentLength > app.MaxDesktopClientReleaseChunkMultipartBytes() {
			response.Error(c, response.ErrBadRequest(40076, "invalid_release_upload_chunk", "上传分片不能超过 64MB"))
			return
		}
		c.Request.Body = http.MaxBytesReader(c.Writer, c.Request.Body, app.MaxDesktopClientReleaseChunkMultipartBytes())

		chunkIndex, err := strconv.Atoi(c.Param("chunk_index"))
		if err != nil {
			response.Error(c, response.ErrBadRequest(40076, "invalid_release_upload_chunk", "上传分片序号无效"))
			return
		}
		fileHeader, err := c.FormFile("file")
		if err != nil {
			if strings.Contains(err.Error(), "request body too large") {
				response.Error(c, response.ErrBadRequest(40076, "invalid_release_upload_chunk", "上传分片不能超过 64MB"))
				return
			}
			response.Error(c, response.ErrBadRequest(40071, "release_file_required", "请选择要上传的客户端安装包"))
			return
		}
		if c.Request.MultipartForm != nil {
			defer c.Request.MultipartForm.RemoveAll()
		}
		if fileHeader.Size > app.MaxDesktopClientReleaseChunkSizeBytes {
			response.Error(c, response.ErrBadRequest(40076, "invalid_release_upload_chunk", "上传分片不能超过 64MB"))
			return
		}
		file, err := fileHeader.Open()
		if err != nil {
			response.Error(c, response.ErrBadRequest(40071, "release_file_open_failed", "客户端安装包读取失败"))
			return
		}
		defer file.Close()

		result, err := svc.UploadChunk(c.Request.Context(), app.DesktopClientReleaseChunkUploadInput{
			UploadID:         c.Param("upload_id"),
			ChunkIndex:       chunkIndex,
			ContentReader:    file,
			ContentSizeBytes: fileHeader.Size,
		})
		if err != nil {
			response.Error(c, err)
			return
		}
		response.Success(c, result)
	}
}

func completeDesktopClientReleaseUploadHandler(svc *app.DesktopClientReleaseService) gin.HandlerFunc {
	return func(c *gin.Context) {
		result, err := svc.CompleteChunkedUpload(c.Request.Context(), c.Param("upload_id"))
		if err != nil {
			response.Error(c, err)
			return
		}
		response.Success(c, result)
	}
}

func abortDesktopClientReleaseUploadHandler(svc *app.DesktopClientReleaseService) gin.HandlerFunc {
	return func(c *gin.Context) {
		if err := svc.AbortChunkedUpload(c.Param("upload_id")); err != nil {
			response.Error(c, err)
			return
		}
		response.Success(c, gin.H{"upload_id": c.Param("upload_id")})
	}
}

func checkDesktopClientReleaseHandler(svc *app.DesktopClientReleaseService) gin.HandlerFunc {
	return func(c *gin.Context) {
		result, err := svc.CheckLatest(c.Request.Context(), app.DesktopClientReleaseCheckInput{
			Platform:       c.Query("platform"),
			Arch:           c.Query("arch"),
			Channel:        c.DefaultQuery("channel", "stable"),
			CurrentVersion: c.Query("version"),
		})
		if err != nil {
			response.Error(c, err)
			return
		}
		response.Success(c, result)
	}
}

func resolveLatestDesktopClientReleaseDownloadURLHandler(svc *app.DesktopClientReleaseService) gin.HandlerFunc {
	return func(c *gin.Context) {
		result, err := svc.ResolveLatestDownloadURL(c.Request.Context(), app.DesktopClientReleaseCheckInput{
			Platform:       c.Query("platform"),
			Arch:           c.Query("arch"),
			Channel:        c.DefaultQuery("channel", "stable"),
			CurrentVersion: c.Query("version"),
		})
		if err != nil {
			response.Error(c, err)
			return
		}
		response.Success(c, result)
	}
}

func desktopClientReleaseUpdaterFeedHandler(svc *app.DesktopClientReleaseService) gin.HandlerFunc {
	return func(c *gin.Context) {
		feed, err := svc.ResolveLatestUpdaterFeed(c.Request.Context(), app.DesktopClientReleaseCheckInput{
			Platform:       firstNonEmpty(c.Param("platform"), c.Query("platform")),
			Arch:           firstNonEmpty(c.Param("arch"), c.Query("arch")),
			Channel:        firstNonEmpty(c.Param("channel"), c.DefaultQuery("channel", "stable")),
			CurrentVersion: firstNonEmpty(c.Param("version"), c.Query("version")),
		}, c.Param("feed"))
		if err != nil {
			response.Error(c, err)
			return
		}

		c.Header("Content-Type", "application/x-yaml; charset=utf-8")
		c.Header("Cache-Control", "no-store")
		c.Header("Content-Disposition", fmt.Sprintf(`inline; filename="%s"`, sanitizeHeaderFileName(feed.FileName)))
		c.Data(http.StatusOK, "application/x-yaml; charset=utf-8", feed.Content)
	}
}

func (r desktopClientReleaseRequest) toInput() app.DesktopClientReleaseInput {
	enabled := true
	if r.Enabled != nil {
		enabled = *r.Enabled
	}
	return app.DesktopClientReleaseInput{
		Platform:                 r.Platform,
		Arch:                     r.Arch,
		Channel:                  r.Channel,
		Version:                  r.Version,
		MinSupportedVersion:      r.MinSupportedVersion,
		DownloadSource:           r.DownloadSource,
		OSSObjectKey:             r.OSSObjectKey,
		CustomDownloadURL:        r.CustomDownloadURL,
		FileName:                 r.FileName,
		FileSizeBytes:            r.FileSizeBytes,
		SHA256:                   r.SHA256,
		UpdaterDownloadSource:    r.UpdaterDownloadSource,
		UpdaterOSSObjectKey:      r.UpdaterOSSObjectKey,
		UpdaterCustomDownloadURL: r.UpdaterCustomDownloadURL,
		UpdaterFileName:          r.UpdaterFileName,
		UpdaterFileSizeBytes:     r.UpdaterFileSizeBytes,
		UpdaterSHA256:            r.UpdaterSHA256,
		ReleaseNotes:             r.ReleaseNotes,
		ForceUpdate:              r.ForceUpdate,
		Enabled:                  enabled,
	}
}

func firstNonEmpty(values ...string) string {
	for _, value := range values {
		if strings.TrimSpace(value) != "" {
			return value
		}
	}
	return ""
}

func sanitizeHeaderFileName(value string) string {
	value = strings.TrimSpace(value)
	if value == "" {
		return "latest.yml"
	}
	return strings.Map(func(r rune) rune {
		if r == '"' || r == '\\' || r == '\r' || r == '\n' {
			return -1
		}
		return r
	}, value)
}