package app

import (
	"context"
	"strings"

	"git.5iot.com/iotlcm-public/iotlcm-app/internal/dao"
	"git.5iot.com/iotlcm-public/iotlcm-app/internal/model"
	"git.5iot.com/iotlcm-public/iotlcm-app/internal/model/do"
	"git.5iot.com/iotlcm-public/iotlcm-app/internal/model/entity"
	"git.5iot.com/iotlcm-public/iotlcm-app/internal/service"

	"github.com/gogf/gf/v2/database/gdb"
	"github.com/gogf/gf/v2/errors/gerror"
)

type sAppMessage struct{}

func NewAppMessage() *sAppMessage {
	return &sAppMessage{}
}

func init() {
	service.RegisterAppMessage(NewAppMessage())
}

func (s *sAppMessage) List(ctx context.Context, param *model.AppMessageListParam) (items []*model.AppMessageModel, total int, err error) {
	if param == nil {
		param = &model.AppMessageListParam{}
	}
	if param.Page <= 0 {
		param.Page = 1
	}
	if param.PageSize <= 0 {
		param.PageSize = 20
	}
	if param.PageSize > 100 {
		param.PageSize = 100
	}

	user, err := appCurrentUser(ctx)
	if err != nil {
		return nil, 0, err
	}

	mod := s.applyFilters(s.ownerMessageModel(ctx, user), param)
	total, err = mod.Count()
	if err != nil {
		return nil, 0, gerror.Wrap(err, "查询消息数量失败")
	}
	if total == 0 {
		return []*model.AppMessageModel{}, 0, nil
	}

	if err = mod.
		Fields(appMessageFields()).
		Page(param.Page, param.PageSize).
		OrderDesc("COALESCE(ml." + dao.TMessageLog.Columns().SendTime + ", um." + dao.TUserMessage.Columns().CreatedAt + ")").
		OrderDesc("um." + dao.TUserMessage.Columns().MessageId).
		Scan(&items); err != nil {
		return nil, 0, gerror.Wrap(err, "查询消息列表失败")
	}

	for _, item := range items {
		fillAppMessageText(item)
	}
	return items, total, nil
}

func (s *sAppMessage) Detail(ctx context.Context, param *model.AppMessageDetailParam) (*model.AppMessageModel, error) {
	if param == nil || param.MessageId == 0 {
		return nil, gerror.New("消息ID不能为空")
	}

	user, err := appCurrentUser(ctx)
	if err != nil {
		return nil, err
	}

	var item *model.AppMessageModel
	if err = s.ownerMessageModel(ctx, user).
		Fields(appMessageFields()).
		Where("um."+dao.TUserMessage.Columns().MessageId, param.MessageId).
		Limit(1).
		Scan(&item); err != nil {
		return nil, gerror.Wrap(err, "查询消息详情失败")
	}
	if item == nil || item.MessageId == 0 {
		return nil, gerror.New("消息不存在或无权查看")
	}

	fillAppMessageText(item)
	if item.IsRead == 0 {
		if err = s.Read(ctx, &model.AppMessageReadParam{Ids: []uint64{item.MessageId}}); err != nil {
			return nil, err
		}
		item.IsRead = 1
	}
	return item, nil
}

func (s *sAppMessage) Read(ctx context.Context, param *model.AppMessageReadParam) error {
	if param == nil || len(param.Ids) == 0 {
		return gerror.New("消息ID不能为空")
	}

	user, err := appCurrentUser(ctx)
	if err != nil {
		return err
	}

	_, err = dao.TUserMessage.Ctx(ctx).
		Where(dao.TUserMessage.Columns().TenantId, user.TenantId).
		Where(dao.TUserMessage.Columns().UserId, user.UserId).
		WhereIn(dao.TUserMessage.Columns().MessageId, param.Ids).
		Where(dao.TUserMessage.Columns().IsRead, 0).
		Data(do.TUserMessage{
			IsRead:    1,
			UpdatedBy: user.UserId,
		}).
		Update()
	if err != nil {
		return gerror.Wrap(err, "标记消息已读失败")
	}
	return nil
}

func (s *sAppMessage) ownerMessageModel(ctx context.Context, user *entity.SysUser) *gdb.Model {
	return dao.TUserMessage.Ctx(ctx).As("um").
		InnerJoin(dao.TMessageLog.Table()+" ml", "ml."+dao.TMessageLog.Columns().MessageLogId+" = um."+dao.TUserMessage.Columns().MessageLogId+" AND ml."+dao.TMessageLog.Columns().TenantId+" = um."+dao.TUserMessage.Columns().TenantId).
		Where("um."+dao.TUserMessage.Columns().TenantId, user.TenantId).
		Where("um."+dao.TUserMessage.Columns().UserId, user.UserId).
		Where("ml."+dao.TMessageLog.Columns().IsRecall, 0)
}

func (s *sAppMessage) applyFilters(mod *gdb.Model, param *model.AppMessageListParam) *gdb.Model {
	if param.IsRead != nil {
		mod = mod.Where("um."+dao.TUserMessage.Columns().IsRead, *param.IsRead)
	}
	if param.MessageType != nil && *param.MessageType > 0 {
		mod = mod.Where("ml."+dao.TMessageLog.Columns().MessageType, *param.MessageType)
	}

	keyword := strings.TrimSpace(param.Keyword)
	if keyword != "" {
		like := "%" + keyword + "%"
		mod = mod.Where(
			"(ml."+dao.TMessageLog.Columns().MessageTitle+" LIKE ? OR ml."+dao.TMessageLog.Columns().MessageContent+" LIKE ? OR ml."+dao.TMessageLog.Columns().MessageLink+" LIKE ?)",
			like, like, like,
		)
	}
	return mod
}

func appMessageFields() string {
	return strings.Join([]string{
		"um." + dao.TUserMessage.Columns().MessageId + " AS message_id",
		"um." + dao.TUserMessage.Columns().MessageId + " AS id",
		"um." + dao.TUserMessage.Columns().MessageLogId + " AS message_log_id",
		"COALESCE(ml." + dao.TMessageLog.Columns().MessageType + ", 1) AS message_type",
		"COALESCE(ml." + dao.TMessageLog.Columns().MessageTitle + ", '') AS title",
		"COALESCE(ml." + dao.TMessageLog.Columns().MessageContent + ", '') AS content",
		"COALESCE(ml." + dao.TMessageLog.Columns().MessageLink + ", '') AS link",
		"um." + dao.TUserMessage.Columns().IsRead + " AS is_read",
		"um." + dao.TUserMessage.Columns().CreatedAt + " AS created_at",
		"um." + dao.TUserMessage.Columns().UpdatedAt + " AS updated_at",
		"COALESCE(ml." + dao.TMessageLog.Columns().SendTime + ", um." + dao.TUserMessage.Columns().CreatedAt + ") AS send_time",
	}, ", ")
}

func fillAppMessageText(item *model.AppMessageModel) {
	if item == nil {
		return
	}
	item.Id = item.MessageId
	if strings.TrimSpace(item.Title) == "" {
		item.Title = "未命名消息"
	}
	item.MessageTypeText = appMessageTypeText(item.MessageType)
}

func appMessageTypeText(messageType int) string {
	switch messageType {
	case 1:
		return "系统通知"
	case 2:
		return "平台公告"
	case 3:
		return "订单通知"
	case 4:
		return "账户通知"
	default:
		return "消息"
	}
}