From 5fe9fc73a9eb482d31274ef9ccc9e2557c1c18fc Mon Sep 17 00:00:00 2001
From: kolaente <k@knt.li>
Date: Tue, 21 Nov 2023 19:38:06 +0100
Subject: [PATCH] feat(filter): migrate existing saved filters

---
 pkg/migration/20231121191822.go | 106 ++++++++++++++++++++++++++++++++
 1 file changed, 106 insertions(+)
 create mode 100644 pkg/migration/20231121191822.go

diff --git a/pkg/migration/20231121191822.go b/pkg/migration/20231121191822.go
new file mode 100644
index 000000000..a0e521eea
--- /dev/null
+++ b/pkg/migration/20231121191822.go
@@ -0,0 +1,106 @@
+// Vikunja is a to-do list application to facilitate your life.
+// Copyright 2018-present Vikunja and contributors. All rights reserved.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public Licensee as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public Licensee for more details.
+//
+// You should have received a copy of the GNU Affero General Public Licensee
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package migration
+
+import (
+	"src.techknowlogick.com/xormigrate"
+	"strings"
+	"xorm.io/xorm"
+)
+
+type taskCollectionFilter20231121191822 struct {
+	SortBy  []string `query:"sort_by" json:"sort_by"`
+	OrderBy []string `query:"order_by" json:"order_by"`
+
+	FilterBy         []string `query:"filter_by" json:"filter_by,omitempty"`
+	FilterValue      []string `query:"filter_value" json:"filter_value,omitempty"`
+	FilterComparator []string `query:"filter_comparator" json:"filter_comparator,omitempty"`
+	FilterConcat     string   `query:"filter_concat" json:"filter_concat,omitempty"`
+
+	Filter             string `query:"filter" json:"filter"`
+	FilterIncludeNulls bool   `query:"filter_include_nulls" json:"filter_include_nulls"`
+}
+
+type savedFilter20231121191822 struct {
+	ID      int64                               `xorm:"autoincr not null unique pk" json:"id" param:"filter"`
+	Filters *taskCollectionFilter20231121191822 `xorm:"JSON not null" json:"filters" valid:"required"`
+}
+
+func (savedFilter20231121191822) TableName() string {
+	return "saved_filters"
+}
+
+func init() {
+	migrations = append(migrations, &xormigrate.Migration{
+		ID:          "20231121191822",
+		Description: "Migrate saved filter structure",
+		Migrate: func(tx *xorm.Engine) (err error) {
+			allFilters := []*savedFilter20231121191822{}
+			err = tx.Find(&allFilters)
+			if err != nil {
+				return
+			}
+
+			for _, filter := range allFilters {
+				var filterStrings []string
+				for i, f := range filter.Filters.FilterBy {
+					var comparator string
+					switch filter.Filters.FilterComparator[i] {
+					case "equals":
+						comparator = "="
+					case "greater":
+						comparator = ">"
+					case "greater_equals":
+						comparator = ">="
+					case "less":
+						comparator = "<"
+					case "less_equals":
+						comparator = "<="
+					case "not_equals":
+						comparator = "!="
+					case "like":
+						comparator = "~"
+					case "in":
+						comparator = "?="
+					}
+					filterStrings = append(filterStrings, f+" "+comparator+" "+filter.Filters.FilterValue[i])
+				}
+
+				filter.Filters.FilterConcat = " || "
+				if filter.Filters.FilterConcat == "and" {
+					filter.Filters.FilterConcat = " && "
+				}
+				filter.Filters.Filter = strings.Join(filterStrings, filter.Filters.FilterConcat)
+
+				filter.Filters.FilterBy = nil
+				filter.Filters.FilterComparator = nil
+				filter.Filters.FilterValue = nil
+				filter.Filters.FilterConcat = ""
+
+				_, err = tx.Where("id = ?", filter.ID).Update(filter)
+				if err != nil {
+					return
+				}
+			}
+
+			return nil
+		},
+		Rollback: func(tx *xorm.Engine) error {
+			return nil
+		},
+	})
+}