package handler

import (
	"errors"
	"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/admin"
	"github.com/yuxingu/digital-psychology/apps/api/pkg/response"
)

func (h *AdminHandler) registerRedemption(authed *gin.RouterGroup) {
	authed.POST("/redemption-batches", middleware.RequireAdminPermission(h.Svc, admin.PermMembershipCodesWrite), h.CreateRedemptionBatch)
	authed.GET("/redemption-batches", middleware.RequireAdminPermission(h.Svc, admin.PermMembershipCodesRead), h.ListRedemptionBatches)
	authed.GET("/redemption-batches/:id/codes", middleware.RequireAdminPermission(h.Svc, admin.PermMembershipCodesRead), h.ListRedemptionCodes)
	authed.POST("/redemption-codes/:id/disable", middleware.RequireAdminPermission(h.Svc, admin.PermMembershipCodesWrite), h.DisableRedemptionCode)
}

func (h *AdminHandler) CreateRedemptionBatch(c *gin.Context) {
	adminID, ok := middleware.AdminIDFromContext(c)
	if !ok {
		response.Fail(c, http.StatusUnauthorized, 40102, "admin session invalid")
		return
	}
	var body struct {
		Label    string `json:"label"`
		PlanCode string `json:"plan_code"`
		Quantity int    `json:"quantity"`
	}
	if err := c.ShouldBindJSON(&body); err != nil {
		response.Fail(c, http.StatusBadRequest, 40000, "invalid body")
		return
	}
	batch, codes, err := h.Svc.CreateRedemptionBatch(c.Request.Context(), adminID, body.Label, body.PlanCode, body.Quantity)
	if errors.Is(err, admin.ErrBadBatchQty) || errors.Is(err, admin.ErrPlanNotFound) || errors.Is(err, admin.ErrInvalidPlanU) {
		response.Fail(c, http.StatusBadRequest, 40000, err.Error())
		return
	}
	if err != nil {
		response.Fail(c, http.StatusInternalServerError, 50000, err.Error())
		return
	}
	response.OK(c, gin.H{"batch": batch, "codes": codes})
}

func (h *AdminHandler) ListRedemptionBatches(c *gin.Context) {
	limit, _ := strconv.Atoi(c.DefaultQuery("limit", "50"))
	items, err := h.Svc.ListRedemptionBatches(c.Request.Context(), limit)
	if err != nil {
		response.Fail(c, http.StatusInternalServerError, 50000, err.Error())
		return
	}
	response.OK(c, gin.H{"items": items})
}

func (h *AdminHandler) ListRedemptionCodes(c *gin.Context) {
	id, err := uuid.Parse(c.Param("id"))
	if err != nil {
		response.Fail(c, http.StatusBadRequest, 40000, "invalid id")
		return
	}
	items, err := h.Svc.ListRedemptionCodes(c.Request.Context(), id)
	if errors.Is(err, admin.ErrBatchNotFound) {
		response.Fail(c, http.StatusNotFound, 40400, "batch not found")
		return
	}
	if err != nil {
		response.Fail(c, http.StatusInternalServerError, 50000, err.Error())
		return
	}
	response.OK(c, gin.H{"items": items})
}

func (h *AdminHandler) DisableRedemptionCode(c *gin.Context) {
	adminID, ok := middleware.AdminIDFromContext(c)
	if !ok {
		response.Fail(c, http.StatusUnauthorized, 40102, "admin session invalid")
		return
	}
	id, err := uuid.Parse(c.Param("id"))
	if err != nil {
		response.Fail(c, http.StatusBadRequest, 40000, "invalid id")
		return
	}
	err = h.Svc.DisableRedemptionCode(c.Request.Context(), adminID, id)
	if errors.Is(err, admin.ErrCodeDisable) {
		response.Fail(c, http.StatusBadRequest, 40000, err.Error())
		return
	}
	if err != nil {
		response.Fail(c, http.StatusInternalServerError, 50000, err.Error())
		return
	}
	response.OK(c, gin.H{"ok": true})
}