// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

////
//
// A few enums copied from `fb/Schema.ts` and `fb/Message.ts` because Webpack
// v4 doesn't seem to be able to tree-shake the rest of those exports.
//
// We will have to keep these enums in sync when we re-generate the flatbuffers
// code from the shchemas. See js/DEVELOP.md for info on how to run flatbuffers
// code generation.
//
////

/**
 * Logical types, vector layouts, and schemas
 *
 * @enum {number}
 */
export enum MetadataVersion {
    /**
     * 0.1.0 (October 2016).
     */
    V1 = 0,

    /**
     * 0.2.0 (February 2017). Non-backwards compatible with V1.
     */
    V2 = 1,

    /**
     * 0.3.0 -> 0.7.1 (May - December 2017). Non-backwards compatible with V2.
     */
    V3 = 2,

    /**
     * >= 0.8.0 (December 2017). Non-backwards compatible with V3.
     */
    V4 = 3,

    /**
     * >= 1.0.0 (July 2020. Backwards compatible with V4 (V5 readers can read V4
     * metadata and IPC messages). Implementations are recommended to provide a
     * V4 compatibility mode with V5 format changes disabled.
     *
     * Incompatible changes between V4 and V5:
     * - Union buffer layout has changed. In V5, Unions don't have a validity
     *   bitmap buffer.
     */
    V5 = 4
}

/**
 * @enum {number}
 */
export enum UnionMode {
    Sparse = 0,
    Dense = 1
}

/**
 * @enum {number}
 */
export enum Precision {
    HALF = 0,
    SINGLE = 1,
    DOUBLE = 2
}

/**
 * @enum {number}
 */
export enum DateUnit {
    DAY = 0,
    MILLISECOND = 1
}

/**
 * @enum {number}
 */
export enum TimeUnit {
    SECOND = 0,
    MILLISECOND = 1,
    MICROSECOND = 2,
    NANOSECOND = 3
}

/**
 * @enum {number}
 */
export enum IntervalUnit {
    YEAR_MONTH = 0,
    DAY_TIME = 1,
    MONTH_DAY_NANO = 2
}

/**
 * ----------------------------------------------------------------------
 * The root Message type
 * This union enables us to easily send different message types without
 * redundant storage, and in the future we can easily add new message types.
 *
 * Arrow implementations do not need to implement all of the message types,
 * which may include experimental metadata types. For maximum compatibility,
 * it is best to send data using RecordBatch
 *
 * @enum {number}
 */
export enum MessageHeader {
    NONE = 0,
    Schema = 1,
    DictionaryBatch = 2,
    RecordBatch = 3,
    Tensor = 4,
    SparseTensor = 5
}

/**
 * Main data type enumeration.
 *
 * Data types in this library are all *logical*. They can be expressed as
 * either a primitive physical type (bytes or bits of some fixed size), a
 * nested type consisting of other data types, or another data type (e.g. a
 * timestamp encoded as an int64).
 *
 * **Note**: Only enum values 0-17 (NONE through Map) are written to an Arrow
 * IPC payload.
 *
 * The rest of the values are specified here so TypeScript can narrow the type
 * signatures further beyond the base Arrow Types. The Arrow DataTypes include
 * metadata like `bitWidth` that impact the type signatures of the values we
 * accept and return.
 *
 * For example, the `Int8Vector` reads 1-byte numbers from an `Int8Array`, an
 * `Int32Vector` reads a 4-byte number from an `Int32Array`, and an `Int64Vector`
 * reads a pair of 4-byte lo, hi 32-bit integers as a zero-copy slice from the
 * underlying `Int32Array`.
 *
 * Library consumers benefit by knowing the narrowest type, since we can ensure
 * the types across all public methods are propagated, and never bail to `any`.
 * These values are _never_ used at runtime, and they will _never_ be written
 * to the flatbuffers metadata of serialized Arrow IPC payloads.
 */
export enum Type {
    NONE = 0, /** The default placeholder type */
    Null = 1, /** A NULL type having no physical storage */
    Int = 2, /** Signed or unsigned 8, 16, 32, or 64-bit little-endian integer */
    Float = 3, /** 2, 4, or 8-byte floating point value */
    Binary = 4, /** Variable-length bytes (no guarantee of UTF8-ness) */
    Utf8 = 5, /** UTF8 variable-length string as List<Char> */
    Bool = 6, /** Boolean as 1 bit, LSB bit-packed ordering */
    Decimal = 7, /** Precision-and-scale-based decimal type. Storage type depends on the parameters. */
    Date = 8, /** int32_t days or int64_t milliseconds since the UNIX epoch */
    Time = 9, /** Time as signed 32 or 64-bit integer, representing either seconds, milliseconds, microseconds, or nanoseconds since midnight since midnight */
    Timestamp = 10, /** Exact timestamp encoded with int64 since UNIX epoch (Default unit millisecond) */
    Interval = 11, /** YEAR_MONTH or DAY_TIME interval in SQL style */
    List = 12, /** A list of some logical data type */
    Struct = 13, /** Struct of logical types */
    Union = 14, /** Union of logical types */
    FixedSizeBinary = 15, /** Fixed-size binary. Each value occupies the same number of bytes */
    FixedSizeList = 16, /** Fixed-size list. Each value occupies the same number of bytes */
    Map = 17, /** Map of named logical types */

    Dictionary = -1, /** Dictionary aka Category type */
    Int8 = -2,
    Int16 = -3,
    Int32 = -4,
    Int64 = -5,
    Uint8 = -6,
    Uint16 = -7,
    Uint32 = -8,
    Uint64 = -9,
    Float16 = -10,
    Float32 = -11,
    Float64 = -12,
    DateDay = -13,
    DateMillisecond = -14,
    TimestampSecond = -15,
    TimestampMillisecond = -16,
    TimestampMicrosecond = -17,
    TimestampNanosecond = -18,
    TimeSecond = -19,
    TimeMillisecond = -20,
    TimeMicrosecond = -21,
    TimeNanosecond = -22,
    DenseUnion = -23,
    SparseUnion = -24,
    IntervalDayTime = -25,
    IntervalYearMonth = -26,
}

export enum BufferType {
    /**
     * used in List type, Dense Union and variable length primitive types (String, Binary)
     */
    OFFSET = 0,

    /**
     * actual data, either wixed width primitive types in slots or variable width delimited by an OFFSET vector
     */
    DATA = 1,

    /**
     * Bit vector indicating if each value is null
     */
    VALIDITY = 2,

    /**
     * Type vector used in Union type
     */
    TYPE = 3
}