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// Protocol messages of candidates to be used for mozc client/server
// communication and client/renderer communication.

syntax = "proto2";

package mozc.commands;

option java_outer_classname = "ProtoCandidates";
option java_package = "org.mozc.android.inputmethod.japanese.protobuf";

// Annotation against a candidate.
message Annotation {
  // Annotation prepended to the value.
  optional string prefix = 1;
  // Annotation appended to the value.
  optional string suffix = 2;
  // Type of the candidate such as [HALF][KATAKANA], [GREEK],
  // [Black square], etc...
  optional string description = 3;
  // Shortcut key to select this candidate.
  optional string shortcut = 4;
  // Set to true if this candidate can be deleted from history.
  optional bool deletable = 5 [default = false];
};

// Additional information to a candidate word.  This message is
// used for describing a word usage for instance.
message Information {
  // Unique number specifying the information.
  optional int32 id = 1;

  // Title string of the information.  For usage, this value is
  // probably equal to Candidate::value or its canonicalized value.
  optional string title = 2;

  // The content of the information.  For usage, this value actually
  // describes how to use the word.
  optional string description = 3;

  // The IDs of candidates which connect with the information.
  repeated int32 candidate_id = 4;
};

// Category describes the attribute of the words.
enum Category {
  CONVERSION = 0;
  PREDICTION = 1;
  SUGGESTION = 2;
  TRANSLITERATION = 3;
  USAGE = 4;
};

// DisplayType is a hint to UI renderers describing how the words are
// displayed.
enum DisplayType {
  MAIN = 0;
  CASCADE = 1;
};

// TODO(nona): merge to RendererCommand::Rectangle
message Rectangle {
  required int32 x = 1;
  required int32 y = 2;
  required int32 width = 3;
  required int32 height = 4;
}

message InformationList {
  optional uint32 focused_index = 1;
  repeated Information information = 2;
  // Category of the infolist.
  optional Category category = 3 [default = CONVERSION];

  // Information to be used for rendering.
  optional DisplayType display_type = 4 [default = CASCADE];

  // How long rendere needs to wait before the infolist is displayed.
  // the default setting is 500 msec.
  optional uint32 delay = 5  [ default = 500 ];
};

// Message representing the footer part of the candidate window.
message Footer {
  // Message shown like a status bar.
  optional string label = 1;
  // Whether index (e.g. 10/120) is visible or not.
  optional bool index_visible = 2 [default = false];
  // Whether the logo image is visible or not.
  optional bool logo_visible = 3 [default = false];
  // Message modestly shown.  It is used for displaying the version on
  // dev-channel now.
  optional string sub_label = 4;
};

message CandidateWord {
  // Unique number specifing the candidate.  This may be a negative value.
  optional int32 id = 1;
  // The first index should be zero and index numbers should increase by one.
  optional uint32 index = 2;
  // Reading of the value.  The value is only used when the key is
  // different from the input composition (e.g. suggestion/prediction).
  optional string key = 3;
  // Converted value.  (e.g. Kanji value).
  optional string value = 4;
  optional Annotation annotation = 5;
};

message CandidateList {
  // This value represents the focused position of the next
  // |candidates|.  If the |candidates| is a part of the whole
  // candidate words (as a result of paging), this value indicates the
  // position from the beginning of that part.  (ex. where
  // |candidates| contatins 10th to 18th candidates, focused_index=0
  // means the 10th candidate, but not 1st candidate.
  //
  // The existense of |focused_index| does not represents whether this
  // candidate list is a 'suggestion' or not.  |category| represents
  // it.
  optional uint32 focused_index = 1;
  repeated CandidateWord candidates = 2;
  // Category of the candidates.
  optional Category category = 3 [default = CONVERSION];
};

// TODO(komatsu) rename it to CandidateWindow.
message Candidates {
  // TODO(komatsu): Use CandidateList.
  // When has_focused_index() is true, this message contains predicted and
  // normally converted candidates. Otherwise, when the field is not set,
  // this message contains a 'suggestion'.
  optional uint32 focused_index = 1;

  // The size of the total candidates in this candidate list.  The
  // value does not include the size of subcandidate lists.  Note, the
  // next repeated-Candidate=3 may not contain all candidates.
  // all_candidates contains the values of subcandidate lists.
  required uint32 size = 2;

  // TODO(komatsu): Use CandidateList.
  repeated group Candidate = 3 {
    // The first index should be zero and index numbers should increase by one.
    required uint32 index = 4;
    required string value = 5;
    optional int32 id = 9;  // Unique number specifing the candidate.
    optional Annotation annotation = 7;
    optional int32 information_id = 10;
  };
  // The position on the composition in character counted by Util::CharsLen.
  // The number represents the left edge of the candidate window.  For example,
  // if the composition is "あいう" and the cursor is the position is between
  // "あ" and "い" (e.g. "あ|いう"), the number should be 1.
  // Note, Util::CharsLen does not take care of IVS or combining character
  // so much.  Thus CharsLen's behavoir on those characters might be changed.
  required uint32 position = 6;

  // Nested candidates aka cascading window.
  optional Candidates subcandidates = 8;

  // Usages of candidates.
  optional InformationList usages = 10;

  // TODO(komatsu): Use CandidateList.
  // Category of the candidates
  optional Category category = 11 [default = CONVERSION];

  // Information to be used for rendering.
  optional DisplayType display_type = 12 [default = MAIN];

  // Footer of the GUI window.
  optional Footer footer = 13;

  // The direction of candidates in the window.  This is just a
  // suggestion from the server and client does not have to follow.
  enum Direction {
    VERTICAL = 0;
    HORIZONTAL = 1;
  };
  optional Direction direction = 14 [ default = VERTICAL ];

  // This position is used for suggest window position.
  optional Rectangle composition_rectangle = 15;
  optional Rectangle caret_rectangle = 16;

  enum CandidateWindowLocation{
    // Shows candidate window under the caret. This is used for prediction and
    // conversion
    CARET = 0;
    // Shows candidate window aligned with composition area. This is used for
    // suggestion.
    COMPOSITION = 1;
  }
  optional CandidateWindowLocation window_location = 17;

  // The number of candidates per page.
  optional uint32 page_size = 18 [ default = 9 ];
};