2 files changed, 219 insertions, 0 deletions

diff --git a/modules/indexer/issues/db/db.go b/modules/indexer/issues/db/db.go
new file mode 100644
index 00000000..05ec5484
--- /dev/null
+++ b/modules/indexer/issues/db/db.go
@@ -0,0 +1,107 @@
+// Copyright 2019 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package db
+
+import (
+	"context"
+
+	"code.gitea.io/gitea/models/db"
+	issue_model "code.gitea.io/gitea/models/issues"
+	indexer_internal "code.gitea.io/gitea/modules/indexer/internal"
+	inner_db "code.gitea.io/gitea/modules/indexer/internal/db"
+	"code.gitea.io/gitea/modules/indexer/issues/internal"
+
+	"xorm.io/builder"
+)
+
+var _ internal.Indexer = &Indexer{}
+
+// Indexer implements Indexer interface to use database's like search
+type Indexer struct {
+	indexer_internal.Indexer
+}
+
+func NewIndexer() *Indexer {
+	return &Indexer{
+		Indexer: &inner_db.Indexer{},
+	}
+}
+
+// Index dummy function
+func (i *Indexer) Index(_ context.Context, _ ...*internal.IndexerData) error {
+	return nil
+}
+
+// Delete dummy function
+func (i *Indexer) Delete(_ context.Context, _ ...int64) error {
+	return nil
+}
+
+// Search searches for issues
+func (i *Indexer) Search(ctx context.Context, options *internal.SearchOptions) (*internal.SearchResult, error) {
+	// FIXME: I tried to avoid importing models here, but it seems to be impossible.
+	//        We can provide a function to register the search function, so models/issues can register it.
+	//        So models/issues will import modules/indexer/issues, it's OK because it's by design.
+	//        But modules/indexer/issues has already imported models/issues to do UpdateRepoIndexer and UpdateIssueIndexer.
+	//        And to avoid circular import, we have to move the functions to another package.
+	//        I believe it should be services/indexer, sounds great!
+	//        But the two functions are used in modules/notification/indexer, that means we will import services/indexer in modules/notification/indexer.
+	//        So that's the root problem:
+	//        The notification is defined in modules, but it's using lots of things should be in services.
+
+	cond := builder.NewCond()
+
+	if options.Keyword != "" {
+		repoCond := builder.In("repo_id", options.RepoIDs)
+		if len(options.RepoIDs) == 1 {
+			repoCond = builder.Eq{"repo_id": options.RepoIDs[0]}
+		}
+		subQuery := builder.Select("id").From("issue").Where(repoCond)
+
+		cond = builder.Or(
+			db.BuildCaseInsensitiveLike("issue.name", options.Keyword),
+			db.BuildCaseInsensitiveLike("issue.content", options.Keyword),
+			builder.In("issue.id", builder.Select("issue_id").
+				From("comment").
+				Where(builder.And(
+					builder.Eq{"type": issue_model.CommentTypeComment},
+					builder.In("issue_id", subQuery),
+					db.BuildCaseInsensitiveLike("content", options.Keyword),
+				)),
+			),
+		)
+	}
+
+	opt, err := ToDBOptions(ctx, options)
+	if err != nil {
+		return nil, err
+	}
+
+	// If pagesize == 0, return total count only. It's a special case for search count.
+	if options.Paginator != nil && options.Paginator.PageSize == 0 {
+		total, err := issue_model.CountIssues(ctx, opt, cond)
+		if err != nil {
+			return nil, err
+		}
+		return &internal.SearchResult{
+			Total: total,
+		}, nil
+	}
+
+	ids, total, err := issue_model.IssueIDs(ctx, opt, cond)
+	if err != nil {
+		return nil, err
+	}
+
+	hits := make([]internal.Match, 0, len(ids))
+	for _, id := range ids {
+		hits = append(hits, internal.Match{
+			ID: id,
+		})
+	}
+	return &internal.SearchResult{
+		Total: total,
+		Hits:  hits,
+	}, nil
+}
diff --git a/modules/indexer/issues/db/options.go b/modules/indexer/issues/db/options.go
new file mode 100644
index 00000000..875a4ca2
--- /dev/null
+++ b/modules/indexer/issues/db/options.go
@@ -0,0 +1,112 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package db
+
+import (
+	"context"
+	"fmt"
+
+	"code.gitea.io/gitea/models/db"
+	issue_model "code.gitea.io/gitea/models/issues"
+	"code.gitea.io/gitea/modules/container"
+	"code.gitea.io/gitea/modules/indexer/issues/internal"
+	"code.gitea.io/gitea/modules/optional"
+)
+
+func ToDBOptions(ctx context.Context, options *internal.SearchOptions) (*issue_model.IssuesOptions, error) {
+	var sortType string
+	switch options.SortBy {
+	case internal.SortByCreatedAsc:
+		sortType = "oldest"
+	case internal.SortByUpdatedAsc:
+		sortType = "leastupdate"
+	case internal.SortByCommentsAsc:
+		sortType = "leastcomment"
+	case internal.SortByDeadlineDesc:
+		sortType = "farduedate"
+	case internal.SortByCreatedDesc:
+		sortType = "newest"
+	case internal.SortByUpdatedDesc:
+		sortType = "recentupdate"
+	case internal.SortByCommentsDesc:
+		sortType = "mostcomment"
+	case internal.SortByDeadlineAsc:
+		sortType = "nearduedate"
+	default:
+		sortType = "newest"
+	}
+
+	// See the comment of issues_model.SearchOptions for the reason why we need to convert
+	convertID := func(id optional.Option[int64]) int64 {
+		if !id.Has() {
+			return 0
+		}
+		value := id.Value()
+		if value == 0 {
+			return db.NoConditionID
+		}
+		return value
+	}
+
+	opts := &issue_model.IssuesOptions{
+		Paginator:          options.Paginator,
+		RepoIDs:            options.RepoIDs,
+		AllPublic:          options.AllPublic,
+		RepoCond:           nil,
+		AssigneeID:         convertID(options.AssigneeID),
+		PosterID:           convertID(options.PosterID),
+		MentionedID:        convertID(options.MentionID),
+		ReviewRequestedID:  convertID(options.ReviewRequestedID),
+		ReviewedID:         convertID(options.ReviewedID),
+		SubscriberID:       convertID(options.SubscriberID),
+		ProjectID:          convertID(options.ProjectID),
+		ProjectColumnID:    convertID(options.ProjectColumnID),
+		IsClosed:           options.IsClosed,
+		IsPull:             options.IsPull,
+		IncludedLabelNames: nil,
+		ExcludedLabelNames: nil,
+		IncludeMilestones:  nil,
+		SortType:           sortType,
+		IssueIDs:           nil,
+		UpdatedAfterUnix:   options.UpdatedAfterUnix.Value(),
+		UpdatedBeforeUnix:  options.UpdatedBeforeUnix.Value(),
+		PriorityRepoID:     0,
+		IsArchived:         optional.None[bool](),
+		Org:                nil,
+		Team:               nil,
+		User:               nil,
+	}
+
+	if len(options.MilestoneIDs) == 1 && options.MilestoneIDs[0] == 0 {
+		opts.MilestoneIDs = []int64{db.NoConditionID}
+	} else {
+		opts.MilestoneIDs = options.MilestoneIDs
+	}
+
+	if options.NoLabelOnly {
+		opts.LabelIDs = []int64{0} // Be careful, it's zero, not db.NoConditionID
+	} else {
+		opts.LabelIDs = make([]int64, 0, len(options.IncludedLabelIDs)+len(options.ExcludedLabelIDs))
+		opts.LabelIDs = append(opts.LabelIDs, options.IncludedLabelIDs...)
+		for _, id := range options.ExcludedLabelIDs {
+			opts.LabelIDs = append(opts.LabelIDs, -id)
+		}
+
+		if len(options.IncludedLabelIDs) == 0 && len(options.IncludedAnyLabelIDs) > 0 {
+			labels, err := issue_model.GetLabelsByIDs(ctx, options.IncludedAnyLabelIDs, "name")
+			if err != nil {
+				return nil, fmt.Errorf("GetLabelsByIDs: %v", err)
+			}
+			set := container.Set[string]{}
+			for _, label := range labels {
+				if !set.Contains(label.Name) {
+					set.Add(label.Name)
+					opts.IncludedLabelNames = append(opts.IncludedLabelNames, label.Name)
+				}
+			}
+		}
+	}
+
+	return opts, nil
+}