package friendhandler

import (
	"strconv"

	"github.com/gin-gonic/gin"

	friendlogic "spark-server/internal/module/friend/logic"
	"spark-server/internal/pkg/errs"
	"spark-server/internal/pkg/reqctx"
	"spark-server/internal/transport/http/respond"
)

// Handler is the friends HTTP controller.
type Handler struct {
	friends *friendlogic.Service
}

func New(friends *friendlogic.Service) *Handler {
	return &Handler{friends: friends}
}

func (h *Handler) Lookup(c *gin.Context) {
	uid, ok := currentUID(c)
	if !ok {
		return
	}
	in := friendlogic.LookupInput{
		Email:   c.Query("email"),
		SparkID: c.Query("spark_id"),
		QRCode:  c.Query("qrcode"),
	}
	if raw := c.Query("uid"); raw != "" {
		id, err := strconv.ParseInt(raw, 10, 64)
		if err != nil || id <= 0 {
			respond.JSONError(c, errs.ErrInvalidArgument)
			return
		}
		in.UID = id
	}
	view, err := h.friends.Lookup(c.Request.Context(), uid, in)
	if err != nil {
		respond.JSONError(c, err)
		return
	}
	respond.JSON(c, view)
}

func (h *Handler) Apply(c *gin.Context) {
	uid, ok := currentUID(c)
	if !ok {
		return
	}
	var in friendlogic.ApplyInput
	if err := respond.BindJSON(c, &in); err != nil {
		respond.JSONError(c, err)
		return
	}
	out, err := h.friends.Apply(c.Request.Context(), uid, &in)
	if err != nil {
		respond.JSONError(c, err)
		return
	}
	respond.JSON(c, out)
}

func (h *Handler) ListRequests(c *gin.Context) {
	uid, ok := currentUID(c)
	if !ok {
		return
	}
	out, err := h.friends.ListRequests(c.Request.Context(), uid, queryLimit(c))
	if err != nil {
		respond.JSONError(c, err)
		return
	}
	respond.JSON(c, out)
}

func (h *Handler) Accept(c *gin.Context) {
	uid, ok := currentUID(c)
	if !ok {
		return
	}
	var in friendlogic.AcceptInput
	if err := respond.BindJSON(c, &in); err != nil {
		respond.JSONError(c, err)
		return
	}
	out, err := h.friends.Accept(c.Request.Context(), uid, in)
	if err != nil {
		respond.JSONError(c, err)
		return
	}
	respond.JSON(c, out)
}

func (h *Handler) List(c *gin.Context) {
	uid, ok := currentUID(c)
	if !ok {
		return
	}
	out, err := h.friends.List(c.Request.Context(), uid, queryLimit(c))
	if err != nil {
		respond.JSONError(c, err)
		return
	}
	respond.JSON(c, out)
}

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

func queryLimit(c *gin.Context) int {
	n, _ := strconv.Atoi(c.Query("limit"))
	return n
}

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