module analytics.data;

import std.datetime;
import handy_http_primitives : Optional;
import asdf : serdeTransformOut;

import util.money;
import util.data;
import account.model;

/**
 * A common time-series data point.
 */
struct TimeSeriesPoint {
    /// The millisecond UTC timestamp.
    ulong x;
    /// The value at this timestamp.
    long y;
}

struct JournalEntryStub {
    SysTime timestamp;
    ulong accountId;
    AccountType accountType;
    ulong amount;
    AccountJournalEntryType type;
}

struct BalanceRecordStub {
    SysTime timestamp;
    ulong accountId;
    long value;
}

struct CategorySpendData {
    ulong categoryId;
    string categoryName;
    string categoryColor;
    @serdeTransformOut!serializeOptional
    Optional!ulong parentCategoryId;
    long amount;
}

/**
 * Repository that provides various functions for fetching data that's used in
 * the calculation of analytics, separate from usual app functionality.
 */
interface AnalyticsRepository {
    JournalEntryStub[] getJournalEntries(
        in Currency currency,
        in TimeRange timeRange
    );
    BalanceRecordStub[] getBalanceRecords(
        in Currency currency,
        in TimeRange timeRange
    );
    CategorySpendData[] getCategorySpendData(
        in Currency currency,
        in TimeRange timeRange
    );
}