Messaging/pkg/internal/server/api/whats_new_api.go

package api

import (
	"fmt"
	"git.solsynth.dev/hydrogen/messaging/pkg/internal/database"
	"git.solsynth.dev/hydrogen/messaging/pkg/internal/gap"
	"git.solsynth.dev/hydrogen/messaging/pkg/internal/models"
	"github.com/gofiber/fiber/v2"
)

func getWhatsNew(c *fiber.Ctx) error {
	if err := gap.H.EnsureAuthenticated(c); err != nil {
		return err
	}
	user := c.Locals("user").(models.Account)

	pivot := c.QueryInt("pivot", 0)
	if pivot < 0 {
		return fiber.NewError(fiber.StatusBadRequest, "pivot must be greater than zero")
	}

	take := c.QueryInt("take", 10)
	if take > 100 {
		take = 100
	}

	tx := database.C

	var lookupRange []uint
	var channelMembers []models.ChannelMember
	if err := database.C.Where("account_id = ?", user.ID).Select("channel_id").Find(&channelMembers).Error; err != nil {
		return fiber.NewError(fiber.StatusInternalServerError, fmt.Sprintf("unable to get channel identity of you: %v", err))
	} else {
		for _, member := range channelMembers {
			lookupRange = append(lookupRange, member.ChannelID)
		}
	}

	tx = tx.Where("channel_id IN ?", lookupRange)
	tx = tx.Where("id > ?", pivot)

	countTx := tx
	var count int64
	if err := countTx.Model(&models.Event{}).Count(&count).Error; err != nil {
		return fiber.NewError(fiber.StatusInternalServerError, err.Error())
	}

	var items []models.Event
	if err := database.C.
		Where("channel_id IN ?", lookupRange).
		Limit(take).
		Order("created_at DESC").
		Preload("Sender").
		Preload("Sender.Account").
		Preload("Channel").
		Find(&items).Error; err != nil {
		return fiber.NewError(fiber.StatusBadRequest, err.Error())
	}

	return c.JSON(fiber.Map{
		"count": count,
		"data":  items,
	})

}