package msghandler

import (
	"strconv"

	"github.com/gin-gonic/gin"

	msglogic "spark-server/internal/module/message/logic"
	"spark-server/internal/pkg/errs"
	"spark-server/internal/pkg/reqctx"
	"spark-server/internal/transport/http/respond"
)

// Handler is the messages HTTP controller.
type Handler struct {
	msgs *msglogic.Service
}

func New(msgs *msglogic.Service) *Handler {
	return &Handler{msgs: msgs}
}

func (h *Handler) Send(c *gin.Context) {
	uid, did, ok := currentUser(c)
	if !ok {
		return
	}
	var in msglogic.SendInput
	if err := respond.BindJSON(c, &in); err != nil {
		respond.JSONError(c, err)
		return
	}
	out, err := h.msgs.SendMessage(c.Request.Context(), uid, did, &in)
	if err != nil {
		respond.JSONError(c, err)
		return
	}
	respond.JSON(c, out)
}

func (h *Handler) History(c *gin.Context) {
	uid, _, ok := currentUser(c)
	if !ok {
		return
	}
	convID, err := strconv.ParseInt(c.Query("conversation_id"), 10, 64)
	if err != nil || convID <= 0 {
		respond.JSONError(c, errs.ErrInvalidArgument)
		return
	}
	lastID, _ := strconv.ParseInt(c.Query("last_msg_id"), 10, 64)
	limit, _ := strconv.Atoi(c.Query("limit"))
	out, err := h.msgs.GetHistory(c.Request.Context(), uid, msglogic.HistoryRequest{
		ConversationID: convID, LastMsgID: lastID, Limit: limit,
	})
	if err != nil {
		respond.JSONError(c, err)
		return
	}
	respond.JSON(c, out)
}

func (h *Handler) Recall(c *gin.Context) {
	uid, did, ok := currentUser(c)
	if !ok {
		return
	}
	id, err := pathMsgID(c)
	if err != nil {
		respond.JSONError(c, err)
		return
	}
	if err := h.msgs.RecallMessage(c.Request.Context(), uid, did, id); err != nil {
		respond.JSONError(c, err)
		return
	}
	respond.JSON(c, gin.H{})
}

func (h *Handler) Delete(c *gin.Context) {
	uid, did, ok := currentUser(c)
	if !ok {
		return
	}
	id, err := pathMsgID(c)
	if err != nil {
		respond.JSONError(c, err)
		return
	}
	if err := h.msgs.DeleteMessage(c.Request.Context(), uid, did, id); err != nil {
		respond.JSONError(c, err)
		return
	}
	respond.JSON(c, gin.H{})
}

func pathMsgID(c *gin.Context) (int64, error) {
	id, err := strconv.ParseInt(c.Param("id"), 10, 64)
	if err != nil || id <= 0 {
		return 0, errs.ErrInvalidArgument
	}
	return id, nil
}

func currentUser(c *gin.Context) (int64, uint64, bool) {
	rc := reqctx.From(c.Request.Context())
	if rc == nil || rc.UserID <= 0 {
		respond.JSONError(c, errs.ErrUnauthorized)
		return 0, 0, false
	}
	return rc.UserID, rc.DeviceID, true
}