syntax = "proto3";

package backend_proto;

message Empty {}

message BackendInit {
    string collection_path = 1;
    string media_folder_path = 2;
    string media_db_path = 3;
    repeated string preferred_langs = 4;
    string locale_folder_path = 5;
}

// 1-15 reserved for future use; 2047 for errors

message BackendInput {
    reserved 2047;
    oneof value {
        TemplateRequirementsIn template_requirements = 16;
        SchedTimingTodayIn sched_timing_today = 17;
        Empty deck_tree = 18;
        FindCardsIn find_cards = 19;
        BrowserRowsIn browser_rows = 20;
        RenderCardIn render_card = 21;
        int64 local_minutes_west = 22;
        string strip_av_tags = 23;
        ExtractAVTagsIn extract_av_tags = 24;
        ExtractLatexIn extract_latex = 25;
        AddMediaFileIn add_media_file = 26;
        SyncMediaIn sync_media = 27;
        Empty check_media = 28;
        TrashMediaFilesIn trash_media_files = 29;
    }
}

message BackendOutput {
    oneof value {
        TemplateRequirementsOut template_requirements = 16;
        SchedTimingTodayOut sched_timing_today = 17;
        DeckTreeOut deck_tree = 18;
        FindCardsOut find_cards = 19;
        BrowserRowsOut browser_rows = 20;
        RenderCardOut render_card = 21;
        sint32 local_minutes_west = 22;
        string strip_av_tags = 23;
        ExtractAVTagsOut extract_av_tags = 24;
        ExtractLatexOut extract_latex = 25;
        string add_media_file = 26;
        Empty sync_media = 27;
        MediaCheckOut check_media = 28;
        Empty trash_media_files = 29;

        BackendError error = 2047;
    }
}

message BackendError {
    oneof value {
        StringError invalid_input = 1;
        TemplateParseError template_parse = 2;
        StringError io_error = 3;
        StringError db_error = 4;
        NetworkError network_error = 5;
        SyncError sync_error = 6;
        // user interrupted operation
        Empty interrupted = 8;
    }
}

message Progress {
    oneof value {
        MediaSyncProgress media_sync = 1;
        uint32 media_check = 2;
    }
}

message StringError {
    string info = 1;
}

message TemplateParseError {
    string info = 1;
    bool q_side = 2;
}

message NetworkError {
    string info = 1;
    enum NetworkErrorKind {
        OTHER = 0;
        OFFLINE = 1;
        TIMEOUT = 2;
        PROXY_AUTH = 3;
    }
    NetworkErrorKind kind = 2;
}

message SyncError {
    string info = 1;
    enum SyncErrorKind {
        OTHER = 0;
        CONFLICT = 1;
        SERVER_ERROR = 2;
        CLIENT_TOO_OLD = 3;
        AUTH_FAILED = 4;
        SERVER_MESSAGE = 5;
        MEDIA_CHECK_REQUIRED = 6;
        RESYNC_REQUIRED = 7;
    }
    SyncErrorKind kind = 2;
}

message MediaSyncProgress {
    uint32 checked = 1;
    uint32 downloaded_files = 2;
    uint32 downloaded_deletions = 3;
    uint32 uploaded_files = 4;
    uint32 uploaded_deletions = 5;
}

message MediaSyncUploadProgress {
    uint32 files = 1;
    uint32 deletions = 2;
}

message TemplateRequirementsIn {
    repeated string template_front = 1;
    map<string, uint32> field_names_to_ordinals = 2;
}

message TemplateRequirementsOut {
    repeated TemplateRequirement requirements = 1;
}

message TemplateRequirement {
    oneof value {
        TemplateRequirementAll all = 1;
        TemplateRequirementAny any = 2;
        Empty none = 3;
    }
}

message TemplateRequirementAll {
    repeated uint32 ords = 1;
}

message TemplateRequirementAny {
    repeated uint32 ords = 1;
}

message SchedTimingTodayIn {
    int64 created_secs = 1;
    sint32 created_mins_west = 2;
    int64 now_secs = 3;
    sint32 now_mins_west = 4;
    sint32 rollover_hour = 5;
}

message SchedTimingTodayOut {
    uint32 days_elapsed = 1;
    int64 next_day_at = 2;
}

message DeckTreeOut {
    DeckTreeNode top = 1;
}

message DeckTreeNode {
    // the components of a deck, split on ::
    repeated string names = 1;
    int64 deck_id = 2;
    uint32 review_count = 3;
    uint32 learn_count = 4;
    uint32 new_count = 5;
    repeated DeckTreeNode children = 6;
    bool collapsed = 7;
}

message FindCardsIn {
    string search = 1;
}

message FindCardsOut {
    repeated int64 card_ids = 1;
}

message BrowserRowsIn {
    repeated int64 card_ids = 1;
}

message BrowserRowsOut {
    // just sort fields for proof of concept
    repeated string sort_fields = 1;
}

message RenderCardIn {
    string question_template = 1;
    string answer_template = 2;
    map<string,string> fields = 3;
    int32 card_ordinal = 4;
}

message RenderCardOut {
    repeated RenderedTemplateNode question_nodes = 1;
    repeated RenderedTemplateNode answer_nodes = 2;
}

message RenderedTemplateNode {
    oneof value {
        string text = 1;
        RenderedTemplateReplacement replacement = 2;
    }
}

message RenderedTemplateReplacement {
    string field_name = 1;
    string current_text = 2;
    repeated string filters = 3;
}

message ExtractAVTagsIn {
    string text = 1;
    bool question_side = 2;
}

message ExtractAVTagsOut {
    string text = 1;
    repeated AVTag av_tags = 2;
}

message AVTag {
    oneof value {
        string sound_or_video = 1;
        TTSTag tts = 2;
    }
}

message TTSTag {
    string field_text = 1;
    string lang = 2;
    repeated string voices = 3;
    float speed = 4;
    repeated string other_args = 5;
}

message ExtractLatexIn {
    string text = 1;
    bool svg = 2;
}

message ExtractLatexOut {
    string text = 1;
    repeated ExtractedLatex latex = 2;
}

message ExtractedLatex {
    string filename = 1;
    string latex_body = 2;
}

message AddMediaFileIn {
    string desired_name = 1;
    bytes data = 2;
}

message SyncMediaIn {
    string hkey = 1;
    string endpoint = 2;
}

message MediaCheckOut {
    repeated string unused = 1;
    repeated string missing = 2;
    repeated string dirs = 3;
    repeated string oversize = 4;
    map<string,string> renamed = 5;
}

message TrashMediaFilesIn {
    repeated string fnames = 1;
}