Sora/Views/SearchSuggestionsView.swift


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88

import SwiftUI

struct SearchSuggestionsView: View {
  private struct CachedTag {
    let original: Either<BooruTag, BooruSearchQuery>
    let names: [String]
  }

  var items: [Either<BooruTag, BooruSearchQuery>]
  @Binding var searchText: String
  @Binding var suppressNextSearchSubmit: Bool

  private var lastSearchTag: String {
    String(searchText.split(separator: " ").last ?? "").lowercased()
  }

  private var cachedTags: [CachedTag] {
    items.map { item in
      switch item {
      case .left(let tag):
        return CachedTag(original: item, names: [tag.name.lowercased()])

      case .right(let query):
        return CachedTag(original: item, names: query.tags.map { $0.lowercased() })
      }
    }
  }

  private var filteredItems: [Either<BooruTag, BooruSearchQuery>] {
    let matchCandidateTag = lastSearchTag
    let matchingTagsLimit = 50

    guard !matchCandidateTag.isEmpty else { return [] }

    var seenTags = Set<String>()
    var matchingTags: [Either<BooruTag, BooruSearchQuery>] = []

    matchingTags.reserveCapacity(matchingTagsLimit)

    for tag in cachedTags {
      if matchingTags.count >= matchingTagsLimit { break }

      for name in tag.names {
        if name.contains(matchCandidateTag), seenTags.insert(name).inserted {
          matchingTags.append(tag.original)

          break
        }
      }
    }

    return matchingTags
  }

  var body: some View {
    ForEach(filteredItems, id: \.self) { item in
      switch item {
      case .left(let tag):
        Button {
          let previousTags = searchText.split(separator: " ").dropLast()

          suppressNextSearchSubmit = true
          searchText = (previousTags.map(String.init) + [tag.name]).joined(separator: " ")
        } label: {
          Text(tag.name)
        }

      case .right(let query):
        Button {
          if let matchingTag = query.tags.first(where: { $0.lowercased().contains(lastSearchTag) })
          {
            let previousTags = searchText.split(separator: " ").dropLast()

            suppressNextSearchSubmit = true
            searchText = (previousTags.map(String.init) + [matchingTag]).joined(separator: " ")
          }
        } label: {
          if let matchingTag = query.tags.first(where: { $0.lowercased().contains(lastSearchTag) })
          {
            Text(matchingTag)
          } else {
            Text(query.tags.first ?? "")
          }
        }
      }
    }
  }
}