package handler

import (
	"net/http"
	"strconv"

	"github.com/gin-gonic/gin"
	"github.com/google/uuid"

	"github.com/yuxingu/digital-psychology/apps/api/internal/middleware"
	"github.com/yuxingu/digital-psychology/apps/api/internal/service/report"
	"github.com/yuxingu/digital-psychology/apps/api/pkg/response"
)

// SynastryHandler exposes nearby + invite social APIs.
type SynastryHandler struct {
	Svc *report.Service
}

// Register mounts synastry social routes.
func (h *SynastryHandler) Register(rg *gin.RouterGroup) {
	rg.GET("/synastry/nearby", h.Nearby)
	rg.POST("/synastry/invites", h.CreateInvite)
	rg.GET("/synastry/invites/:token", h.GetInvite)
	rg.POST("/synastry/invites/:token/accept", h.AcceptInvite)
}

// Nearby handles GET /synastry/nearby?lat=&lng=&radius_km=
func (h *SynastryHandler) Nearby(c *gin.Context) {
	userID, ok := middleware.UserIDFromContext(c)
	if !ok {
		response.Fail(c, http.StatusUnauthorized, 40100, "unauthorized")
		return
	}
	lat, err1 := strconv.ParseFloat(c.Query("lat"), 64)
	lng, err2 := strconv.ParseFloat(c.Query("lng"), 64)
	if err1 != nil || err2 != nil {
		response.Fail(c, http.StatusBadRequest, 10000, "lat/lng required")
		return
	}
	radius := 50.0
	if v := c.Query("radius_km"); v != "" {
		if r, err := strconv.ParseFloat(v, 64); err == nil {
			radius = r
		}
	}
	items, err := h.Svc.Nearby(c.Request.Context(), userID, lat, lng, radius)
	if err != nil {
		response.Fail(c, http.StatusBadRequest, 30002, err.Error())
		return
	}
	response.OK(c, gin.H{"items": items})
}

// CreateInvite handles POST /synastry/invites
func (h *SynastryHandler) CreateInvite(c *gin.Context) {
	userID, ok := middleware.UserIDFromContext(c)
	if !ok {
		response.Fail(c, http.StatusUnauthorized, 40100, "unauthorized")
		return
	}
	var req struct {
		ProfileID string `json:"profile_id" binding:"required"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		response.Fail(c, http.StatusBadRequest, 10000, "invalid request")
		return
	}
	pid, err := uuid.Parse(req.ProfileID)
	if err != nil {
		response.Fail(c, http.StatusBadRequest, 10000, "invalid profile_id")
		return
	}
	inv, err := h.Svc.CreateInvite(c.Request.Context(), userID, pid)
	if err != nil {
		response.Fail(c, http.StatusBadRequest, 30002, err.Error())
		return
	}
	response.OK(c, gin.H{
		"token":      inv.Token,
		"expires_at": inv.ExpiresAt,
		"path":       "/synastry/invite/" + inv.Token,
	})
}

// GetInvite handles GET /synastry/invites/:token
func (h *SynastryHandler) GetInvite(c *gin.Context) {
	if _, ok := middleware.UserIDFromContext(c); !ok {
		response.Fail(c, http.StatusUnauthorized, 40100, "unauthorized")
		return
	}
	meta, err := h.Svc.GetInvite(c.Request.Context(), c.Param("token"))
	if err != nil {
		response.Fail(c, http.StatusNotFound, 40401, err.Error())
		return
	}
	response.OK(c, meta)
}

// AcceptInvite handles POST /synastry/invites/:token/accept
func (h *SynastryHandler) AcceptInvite(c *gin.Context) {
	userID, ok := middleware.UserIDFromContext(c)
	if !ok {
		response.Fail(c, http.StatusUnauthorized, 40100, "unauthorized")
		return
	}
	var req struct {
		DisplayName string  `json:"display_name"`
		BirthDate   string  `json:"birth_date" binding:"required"`
		BirthTime   *string `json:"birth_time"`
		BirthPlace  *string `json:"birth_place"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		response.Fail(c, http.StatusBadRequest, 10000, "invalid request")
		return
	}
	rep, err := h.Svc.AcceptInvite(c.Request.Context(), userID, c.Param("token"), req.DisplayName, req.BirthDate, req.BirthTime, req.BirthPlace)
	if err != nil {
		if failTextCompliance(c, err) {
			return
		}
		response.Fail(c, http.StatusBadRequest, 30002, err.Error())
		return
	}
	response.OK(c, rep)
}