package handler

import (
	"errors"
	"net/http"

	"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/repository"
	imagecardsvc "github.com/yuxingu/digital-psychology/apps/api/internal/service/imagecard"
	"github.com/yuxingu/digital-psychology/apps/api/pkg/response"
)

// ImageCardHandler exposes 意象卡片 APIs.
type ImageCardHandler struct {
	Svc *imagecardsvc.Service
}

// Register mounts image-card routes.
func (h *ImageCardHandler) Register(rg *gin.RouterGroup) {
	rg.GET("/image-cards/scenes", h.Scenes)
	rg.GET("/image-cards/quota", h.Quota)
	rg.POST("/image-cards/draw", h.Draw)
}

// Scenes handles GET /image-cards/scenes.
func (h *ImageCardHandler) Scenes(c *gin.Context) {
	response.OK(c, gin.H{"items": h.Svc.Scenes()})
}

// Quota handles GET /image-cards/quota.
func (h *ImageCardHandler) Quota(c *gin.Context) {
	userID, ok := middleware.UserIDFromContext(c)
	if !ok {
		response.Fail(c, http.StatusUnauthorized, 40100, "unauthorized")
		return
	}
	q, err := h.Svc.Quota(c.Request.Context(), userID)
	if err != nil {
		response.Fail(c, http.StatusInternalServerError, 50000, err.Error())
		return
	}
	response.OK(c, q)
}

// Draw handles POST /image-cards/draw.
func (h *ImageCardHandler) Draw(c *gin.Context) {
	userID, ok := middleware.UserIDFromContext(c)
	if !ok {
		response.Fail(c, http.StatusUnauthorized, 40100, "unauthorized")
		return
	}
	var req struct {
		Scene     string `json:"scene"`
		ProfileID string `json:"profile_id" binding:"required"`
		Depth     bool   `json:"depth"`
	}
	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
	}
	out, err := h.Svc.Draw(c.Request.Context(), userID, imagecardsvc.DrawInput{
		Scene: req.Scene, ProfileID: pid, Depth: req.Depth,
	})
	if err != nil {
		if errors.Is(err, repository.ErrQuotaExhausted) {
			response.Fail(c, http.StatusPaymentRequired, 40201, err.Error())
			return
		}
		response.Fail(c, http.StatusBadRequest, 30011, err.Error())
		return
	}
	response.OK(c, out)
}