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) registerLifecycle(authed *gin.RouterGroup) {
	authed.POST("/users/:id/status", middleware.RequireAdminPermission(h.Svc, admin.PermUsersStatusWrite), h.PostUserStatus)
	authed.GET("/users/:id/status-transitions", middleware.RequireAdminPermission(h.Svc, admin.PermUsersRead), h.ListUserStatusTransitions)
}

func (h *AdminHandler) PostUserStatus(c *gin.Context) {
	adminID, ok := middleware.AdminIDFromContext(c)
	if !ok {
		response.Fail(c, http.StatusUnauthorized, 40102, "admin session invalid")
		return
	}
	userID, err := uuid.Parse(c.Param("id"))
	if err != nil {
		response.Fail(c, http.StatusBadRequest, 40000, "invalid id")
		return
	}
	var body struct {
		Status string `json:"status"`
		Reason string `json:"reason"`
	}
	if err := c.ShouldBindJSON(&body); err != nil || body.Status == "" {
		response.Fail(c, http.StatusBadRequest, 40000, "status required")
		return
	}
	err = h.Svc.TransitionUserStatus(c.Request.Context(), adminID, userID, body.Status, body.Reason)
	if errors.Is(err, admin.ErrUserNotFound) {
		response.Fail(c, http.StatusNotFound, 40400, "user not found")
		return
	}
	if errors.Is(err, admin.ErrReasonRequired) || errors.Is(err, admin.ErrInvalidStatusEdge) {
		response.Fail(c, http.StatusBadRequest, 40000, err.Error())
		return
	}
	if err != nil {
		response.Fail(c, http.StatusInternalServerError, 50000, err.Error())
		return
	}
	detail, err := h.Svc.GetUser(c.Request.Context(), userID)
	if err != nil {
		response.Fail(c, http.StatusInternalServerError, 50000, err.Error())
		return
	}
	response.OK(c, detail)
}

func (h *AdminHandler) ListUserStatusTransitions(c *gin.Context) {
	userID, err := uuid.Parse(c.Param("id"))
	if err != nil {
		response.Fail(c, http.StatusBadRequest, 40000, "invalid id")
		return
	}
	limit, _ := strconv.Atoi(c.DefaultQuery("limit", "50"))
	items, err := h.Svc.ListStatusTransitions(c.Request.Context(), userID, limit)
	if errors.Is(err, admin.ErrUserNotFound) {
		response.Fail(c, http.StatusNotFound, 40400, "user not found")
		return
	}
	if err != nil {
		response.Fail(c, http.StatusInternalServerError, 50000, err.Error())
		return
	}
	response.OK(c, gin.H{"items": items})
}