package event

import (
	"errors"
	"nixcn-cms/internal/exception"
	"nixcn-cms/service/service_event"
	"nixcn-cms/tracer"
	"nixcn-cms/utils"

	"github.com/gin-gonic/gin"
)

// Update modifies editable fields of an event owned by the requesting user.
//
//	@Summary		Update an Event
//	@Description	Allows the event owner (Manager) to update name, subtitle, description, start_time, end_time, thumbnail, and is_agenda_published. Lv40+ users (admins) bypass the owner restriction and may update any event. Changes to type or enable_kyc are rejected. is_agenda_published is write-once: it can only be set to true (requires at least one agenda submission) and cannot be reverted.
//	@Tags			Event
//	@Accept			json
//	@Produce		json
//	@Security		Bearer
//	@Param			request	body		service_event.EventUpdateData	true	"Fields to update (all optional except event_id)"
//	@Success		200		{object}	utils.RespStatus{data=nil}		"Successfully updated"
//	@Failure		400		{object}	utils.RespStatus{data=nil}		"Invalid Input / Immutable Field / Agenda Pre-flight Failed"
//	@Failure		401		{object}	utils.RespStatus{data=nil}		"Unauthorized"
//	@Failure		403		{object}	utils.RespStatus{data=nil}		"Not Event Owner"
//	@Failure		404		{object}	utils.RespStatus{data=nil}		"Event Not Found"
//	@Failure		500		{object}	utils.RespStatus{data=nil}		"Internal Server Error"
//	@Router			/event/update [patch]
func (self *EventHandler) Update(c *gin.Context) {
	ctx, span := tracer.StartSpan(
		c.Request.Context(),
		"api_event",
		"update",
	)
	defer span.End()

	ctx = exception.ContextWithEndpoint(ctx, exception.EndpointEventUpdate)
	ctx = exception.ContextWithService(ctx, exception.ServiceEndpoint)

	userIdOrig, ok := c.Get("user_id")
	if !ok {
		errorCode := exception.New(
			exception.WithStatus(exception.StatusUser),
			exception.WithType(exception.TypeCommon),
			exception.WithOriginal(exception.CommonErrorMissingUserId),
			exception.WithError(errors.New("Missing UserId")),
		).Throw(ctx).String()
		utils.HttpResponse(c, 403, errorCode)
		return
	}

	permissionLevelOrig, ok := c.Get("permission_level")
	if !ok {
		errorCode := exception.New(
			exception.WithStatus(exception.StatusUser),
			exception.WithType(exception.TypeCommon),
			exception.WithOriginal(exception.CommonErrorPermissionDenied),
			exception.WithError(errors.New("Missing PermissionLevel")),
		).Throw(ctx).String()
		utils.HttpResponse(c, 403, errorCode)
		return
	}

	var updateData service_event.EventUpdateData
	if err := c.ShouldBindJSON(&updateData); err != nil {
		errorCode := exception.New(
			exception.WithStatus(exception.StatusUser),
			exception.WithType(exception.TypeCommon),
			exception.WithOriginal(exception.CommonErrorInvalidInput),
			exception.WithError(err),
		).Throw(ctx).String()
		utils.HttpResponse(c, 400, errorCode)
		return
	}

	updateData.UserId = userIdOrig.(string)
	updateData.PermissionLevel = permissionLevelOrig.(uint)

	result := self.svc.Update(&service_event.EventUpdatePayload{
		Context: ctx,
		Data:    &updateData,
	})

	if result.Common.Exception.Original != exception.CommonSuccess {
		utils.HttpResponse(c, result.Common.HttpCode, result.Common.Exception.String())
		return
	}

	utils.HttpResponse(c, result.Common.HttpCode, result.Common.Exception.String())
}