package httpRequest

import (
	"encoding/json"
	"maps"
	"net/http"
	"slices"
	"strings"

	"go-socket/packages/Enums/WsEventType"
	"go-socket/packages/postgresql"
	"go-socket/packages/types"
	"go-socket/packages/wsServer"

	"go-socket/packages/config"
	"go-socket/packages/convertions"
	"go-socket/packages/minio"
)

func HandleAttachmentFileUpload(response http.ResponseWriter, request *http.Request) {
	if !validCheckWithResponseOnFail(response, request, file) {
		return
	}
	ctx := request.Context()

	user, err := getUserByToken(ctx, request.Header.Get("token"))
	if err != nil {
		http.Error(response, "invalid token", http.StatusUnauthorized)
		return
	}

	if err = request.ParseMultipartForm(int64(config.MaxRequestBytes)); err != nil {
		http.Error(response, "invalid multipart form", http.StatusBadRequest)
		return
	}

	target := request.FormValue("target_id")
	file, header, err := request.FormFile("file")
	if err != nil {
		http.Error(response, "missing file", http.StatusBadRequest)
		return
	}
	defer file.Close()

	contentType := header.Header.Get("Content-Type")
	var key string

	if conn, ok := getConnection(ctx, target, user); ok {
		key = minio.GetKey(&minio.GetKeyOptions{
			ConnectionId: conn.Id,
			MimeType:     contentType,
			UploadType:   minio.ConnectionFile,
		})
	} else if channel, ok := getChannelFromUser(user, target); ok {
		channel.Mu.RLock()
		perms := channel.UsersCachedPermissions[user.Id]
		channel.Mu.RUnlock()
		if !perms.CanMessage() {
			http.Error(response, "forbidden", http.StatusForbidden)
			return
		}
		key = minio.GetKey(&minio.GetKeyOptions{
			ChannelId:  channel.Id,
			MimeType:   contentType,
			UploadType: minio.HubChannelFile,
		})
	} else {
		http.Error(response, "cannot find target", http.StatusBadRequest)
		return
	}

	if err = minio.Upload(ctx, key, file, header.Size, contentType, map[string]string{
		"originalName": header.Filename,
		"uploaderId":   user.Id.String(),
	}); err != nil {
		http.Error(response, "upload failed", http.StatusInternalServerError)
		return
	}

	response.WriteHeader(http.StatusCreated)
	response.Write([]byte(key))
}

func HandleSetUserAvatar(response http.ResponseWriter, request *http.Request) {
	if !validCheckWithResponseOnFail(response, request, avatar) {
		return
	}
	ctx := request.Context()
	user, err := getUserByToken(ctx, request.Header.Get("token"))
	if err != nil {
		http.Error(response, "invalid token", http.StatusUnauthorized)
		return
	}

	file, header, err := request.FormFile("file")
	if err != nil {
		http.Error(response, "missing file", http.StatusBadRequest)
		return
	}
	defer file.Close()

	isImg, contentType, err := isImage(file)
	if err != nil || !isImg {
		http.Error(response, "invalid file", http.StatusBadRequest)
		return
	}

	key := minio.GetKey(&minio.GetKeyOptions{
		MimeType:   contentType,
		UploadType: minio.UserAvatar,
		UserId:     user.Id,
	})
	err = minio.Upload(ctx, key, file, header.Size, contentType, map[string]string{
		"originalName": header.Filename,
		"uploaderId":   user.Id.String(),
	})
	if err != nil {
		http.Error(response, "upload failed", http.StatusInternalServerError)
		return
	}

	if user.AvatarKey != "" {
		if err = minio.Delete(ctx, user.AvatarKey); err != nil {
			minio.Delete(ctx, key)
			http.Error(response, "internal server error", http.StatusInternalServerError)
			return
		}
	}
	user.AvatarKey = key
	err = postgresql.UserUpdateProfile(ctx, user, &types.UserProfileUpdateList{Avatar: true})
	if err != nil {
		http.Error(response, "failed to update user avatar", http.StatusInternalServerError)
		minio.Delete(ctx, user.AvatarKey)
		return
	}

	user.Mu.RLock()
	connections := slices.Collect(maps.Values(user.Connections))
	user.Mu.RUnlock()

	for _, conn := range connections {
		targetId := conn.GetSecondUser(user.Id)
		target, err := getUserById(ctx, targetId)
		if err != nil {
			continue
		}
		wsServer.WsSendMessageCloseIfTimeout(target, types.WsEventMessage{
			Type: WsEventType.UserAvatarChange,
			Event: &map[string]any{
				"userId": user.Id,
			},
		})
	}

	response.WriteHeader(http.StatusCreated)
}

func HandleGetUserAvatar(response http.ResponseWriter, request *http.Request) {
	if !validCheckWithResponseOnFail(response, request, normal) {
		return
	}
	ctx := request.Context()

	_, err := getUserByToken(ctx, request.Header.Get("token"))
	if err != nil {
		http.Error(response, "invalid token", http.StatusUnauthorized)
		return
	}

	targetId, err := convertions.StringToUuid(request.URL.Query().Get("user_id"))
	if err != nil {
		http.Error(response, "invalid user_id", http.StatusBadRequest)
		return
	}

	target, err := getUserById(ctx, targetId)
	if err != nil {
		http.Error(response, "user not found", http.StatusNotFound)
		return
	}

	if target.AvatarKey == "" {
		http.Error(response, "user have no avatar", http.StatusNoContent)
		return
	}

	url, meta, err := minio.GetDownloadUrlAndMetadata(ctx, target.AvatarKey)
	if err != nil {
		http.Error(response, "internal server error", http.StatusInternalServerError)
		return
	}

	avatarData, err := json.Marshal(map[string]any{
		"url":      url.String(),
		"metadata": meta,
	})
	if err != nil {
		http.Error(response, "json error", http.StatusInternalServerError)
		return
	}

	response.WriteHeader(http.StatusOK)
	response.Write(avatarData)
}

func HandleSetUserProfileBg(response http.ResponseWriter, request *http.Request) {
	if !validCheckWithResponseOnFail(response, request, profileBg) {
		return
	}
	ctx := request.Context()
	user, err := getUserByToken(ctx, request.Header.Get("token"))
	if err != nil {
		http.Error(response, "invalid token", http.StatusUnauthorized)
		return
	}

	file, header, err := request.FormFile("file")
	if err != nil {
		http.Error(response, "missing file", http.StatusBadRequest)
		return
	}
	defer file.Close()

	isImg, contentType, err := isImage(file)
	if err != nil || !isImg {
		http.Error(response, "invalid file", http.StatusBadRequest)
		return
	}

	key := minio.GetKey(&minio.GetKeyOptions{
		MimeType:   contentType,
		UploadType: minio.UserProfileBg,
		UserId:     user.Id,
	})
	err = minio.Upload(ctx, key, file, header.Size, contentType, map[string]string{
		"originalName": header.Filename,
		"uploaderId":   user.Id.String(),
	})
	if err != nil {
		http.Error(response, "upload failed", http.StatusInternalServerError)
		return
	}

	if user.ProfileBgKey != "" {
		if err = minio.Delete(ctx, user.ProfileBgKey); err != nil {
			minio.Delete(ctx, key)
			http.Error(response, "internal server error", http.StatusInternalServerError)
			return
		}
	}
	user.ProfileBgKey = key
	err = postgresql.UserUpdateProfile(ctx, user, &types.UserProfileUpdateList{ProfileBg: true})
	if err != nil {
		http.Error(response, "failed to update user profile background", http.StatusInternalServerError)
		minio.Delete(ctx, user.ProfileBgKey)
		return
	}

	user.Mu.RLock()
	connections := slices.Collect(maps.Values(user.Connections))
	user.Mu.RUnlock()

	for _, conn := range connections {
		target, err := getUserById(ctx, conn.GetSecondUser(user.Id))
		if err != nil {
			continue
		}
		wsServer.WsSendMessageCloseIfTimeout(target, types.WsEventMessage{
			Type: WsEventType.UserProfileBgChange,
			Event: &map[string]any{
				"userId": user.Id,
			},
		})
	}

	response.WriteHeader(http.StatusCreated)
}

func HandleGetUserProfileBg(response http.ResponseWriter, request *http.Request) {
	if !validCheckWithResponseOnFail(response, request, normal) {
		return
	}
	ctx := request.Context()

	_, err := getUserByToken(ctx, request.Header.Get("token"))
	if err != nil {
		http.Error(response, "invalid token", http.StatusUnauthorized)
		return
	}

	targetId, err := convertions.StringToUuid(request.URL.Query().Get("user_id"))
	if err != nil {
		http.Error(response, "invalid user_id", http.StatusBadRequest)
		return
	}

	target, err := getUserById(ctx, targetId)
	if err != nil {
		http.Error(response, "user not found", http.StatusNotFound)
		return
	}

	if target.ProfileBgKey == "" {
		http.Error(response, "user have no profile background", http.StatusNoContent)
		return
	}

	url, meta, err := minio.GetDownloadUrlAndMetadata(ctx, target.ProfileBgKey)
	if err != nil {
		http.Error(response, "internal server error", http.StatusInternalServerError)
		return
	}

	profileBgData, err := json.Marshal(map[string]any{
		"url":      url.String(),
		"metadata": meta,
	})
	if err != nil {
		http.Error(response, "json error", http.StatusInternalServerError)
		return
	}

	response.WriteHeader(http.StatusOK)
	response.Write(profileBgData)
}

func HandleAttachmentFileDownload(response http.ResponseWriter, request *http.Request) {
	if !validCheckWithResponseOnFail(response, request, normal) {
		return
	}
	ctx := request.Context()

	user, err := getUserByToken(ctx, request.Header.Get("token"))
	if err != nil {
		http.Error(response, "invalid token", http.StatusUnauthorized)
		return
	}

	target := request.URL.Query().Get("target_id")
	key := request.URL.Query().Get("key")

	var validPrefix string
	if conn, ok := getConnection(ctx, target, user); ok {
		validPrefix = string(minio.ConnectionFilePrefix) + conn.Id.String() + "/"
	} else if channel, ok := getChannelFromUser(user, target); ok {
		channel.Mu.RLock()
		perms := channel.UsersCachedPermissions[user.Id]
		channel.Mu.RUnlock()
		if !perms.CanReadHistory() {
			http.Error(response, "forbidden", http.StatusForbidden)
			return
		}
		validPrefix = string(minio.HubChannelFilePrefix) + channel.Id.String() + "/"
	} else {
		http.Error(response, "cannot find target", http.StatusBadRequest)
		return
	}

	if !strings.HasPrefix(key, validPrefix) {
		http.Error(response, "no such file", http.StatusUnauthorized)
		return
	}

	url, meta, err := minio.GetDownloadUrlAndMetadata(ctx, key)
	if err != nil {
		http.Error(response, "no such file", http.StatusUnauthorized)
		return
	}

	fileData, err := json.Marshal(map[string]string{
		"url":          url.String(),
		"originalName": meta["originalName"],
	})
	if err != nil {
		http.Error(response, "metadata error", http.StatusInternalServerError)
		return
	}

	response.WriteHeader(http.StatusOK)
	response.Write(fileData)
}