package handler

import (
	"errors"
	"net/http"
	"time"

	"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/profile"
	"github.com/yuxingu/digital-psychology/apps/api/pkg/response"
)

// ProfileHandler exposes personal archive APIs.
type ProfileHandler struct {
	Svc *profile.Service
}

// Register mounts profile routes (requires device auth on group).
func (h *ProfileHandler) Register(rg *gin.RouterGroup) {
	rg.GET("/profiles", h.List)
	rg.POST("/profiles", h.Create)
	rg.PATCH("/profiles/:id", h.Update)
	rg.DELETE("/profiles/:id", h.Delete)
}

type createProfileReq struct {
	Relation     string  `json:"relation" binding:"required"`
	DisplayName  string  `json:"display_name"`
	BirthDate    string  `json:"birth_date" binding:"required"`
	RelationType *string `json:"relation_type"`
	BirthTime    *string `json:"birth_time"`
	BirthPlace   *string `json:"birth_place"`
}

// Create handles POST /profiles.
func (h *ProfileHandler) Create(c *gin.Context) {
	userID, ok := middleware.UserIDFromContext(c)
	if !ok {
		response.Fail(c, http.StatusUnauthorized, 40100, "unauthorized")
		return
	}
	var req createProfileReq
	if err := c.ShouldBindJSON(&req); err != nil {
		response.Fail(c, http.StatusBadRequest, 10000, "invalid request")
		return
	}
	birth, err := time.Parse("2006-01-02", req.BirthDate)
	if err != nil {
		response.Fail(c, http.StatusBadRequest, 10000, "birth_date must be YYYY-MM-DD")
		return
	}
	p, err := h.Svc.Create(c.Request.Context(), userID, profile.CreateInput{
		Relation: req.Relation, DisplayName: req.DisplayName, BirthDate: birth,
		RelationType: req.RelationType, BirthTime: req.BirthTime, BirthPlace: req.BirthPlace,
	})
	if err != nil {
		if errors.Is(err, profile.ErrSelfExists) {
			response.Fail(c, http.StatusConflict, 40902, err.Error())
			return
		}
		response.Fail(c, http.StatusBadRequest, 30001, err.Error())
		return
	}
	response.OK(c, p)
}

// List handles GET /profiles.
func (h *ProfileHandler) List(c *gin.Context) {
	userID, ok := middleware.UserIDFromContext(c)
	if !ok {
		response.Fail(c, http.StatusUnauthorized, 40100, "unauthorized")
		return
	}
	list, err := h.Svc.List(c.Request.Context(), userID)
	if err != nil {
		response.Fail(c, http.StatusInternalServerError, 50002, "list failed")
		return
	}
	response.OK(c, gin.H{"items": list})
}

// Update handles PATCH /profiles/:id.
func (h *ProfileHandler) Update(c *gin.Context) {
	userID, ok := middleware.UserIDFromContext(c)
	if !ok {
		response.Fail(c, http.StatusUnauthorized, 40100, "unauthorized")
		return
	}
	pid, err := uuid.Parse(c.Param("id"))
	if err != nil {
		response.Fail(c, http.StatusBadRequest, 10000, "invalid id")
		return
	}
	var req struct {
		DisplayName  string   `json:"display_name"`
		BirthDate    string   `json:"birth_date"`
		RelationType *string  `json:"relation_type"`
		BirthTime    *string  `json:"birth_time"`
		BirthPlace   *string  `json:"birth_place"`
		GeoLat       *float64 `json:"geo_lat"`
		GeoLng       *float64 `json:"geo_lng"`
		GeoVisible   *bool    `json:"geo_visible"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		response.Fail(c, http.StatusBadRequest, 10000, "invalid request")
		return
	}
	var birth time.Time
	if req.BirthDate != "" {
		birth, err = time.Parse("2006-01-02", req.BirthDate)
		if err != nil {
			response.Fail(c, http.StatusBadRequest, 10000, "birth_date must be YYYY-MM-DD")
			return
		}
	}
	p, err := h.Svc.Update(c.Request.Context(), userID, pid, profile.UpdateInput{
		DisplayName: req.DisplayName, BirthDate: birth, RelationType: req.RelationType,
		BirthTime: req.BirthTime, BirthPlace: req.BirthPlace,
		GeoLat: req.GeoLat, GeoLng: req.GeoLng, GeoVisible: req.GeoVisible,
	})
	if err != nil {
		response.Fail(c, http.StatusNotFound, 40401, err.Error())
		return
	}
	response.OK(c, p)
}

// Delete handles DELETE /profiles/:id.
func (h *ProfileHandler) Delete(c *gin.Context) {
	userID, ok := middleware.UserIDFromContext(c)
	if !ok {
		response.Fail(c, http.StatusUnauthorized, 40100, "unauthorized")
		return
	}
	pid, err := uuid.Parse(c.Param("id"))
	if err != nil {
		response.Fail(c, http.StatusBadRequest, 10000, "invalid id")
		return
	}
	if err := h.Svc.Delete(c.Request.Context(), userID, pid); err != nil {
		response.Fail(c, http.StatusNotFound, 40401, err.Error())
		return
	}
	response.OK(c, gin.H{"deleted": true})
}