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//! The SQLite backend
use byteorder::NativeEndian;

use super::connection::SqliteValue;
use super::query_builder::SqliteQueryBuilder;
use crate::backend::*;
use crate::query_builder::bind_collector::RawBytesBindCollector;
use crate::sql_types::TypeMetadata;

/// The SQLite backend
#[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
pub struct Sqlite;

/// Determines how a bind parameter is given to SQLite
///
/// Diesel deals with bind parameters after serialization as opaque blobs of
/// bytes. However, SQLite instead has several functions where it expects the
/// relevant C types.
///
/// The variants of this struct determine what bytes are expected from
/// `ToSql` impls.
#[allow(missing_debug_implementations)]
#[derive(Hash, PartialEq, Eq, Clone, Copy)]
pub enum SqliteType {
    /// Bind using `sqlite3_bind_blob`
    Binary,
    /// Bind using `sqlite3_bind_text`
    Text,
    /// `bytes` should contain an `f32`
    Float,
    /// `bytes` should contain an `f64`
    Double,
    /// `bytes` should contain an `i16`
    SmallInt,
    /// `bytes` should contain an `i32`
    Integer,
    /// `bytes` should contain an `i64`
    Long,
}

impl Backend for Sqlite {
    type QueryBuilder = SqliteQueryBuilder;
    type BindCollector = RawBytesBindCollector<Sqlite>;
    type ByteOrder = NativeEndian;
}

impl<'a> HasRawValue<'a> for Sqlite {
    type RawValue = &'a SqliteValue;
}

impl TypeMetadata for Sqlite {
    type TypeMetadata = SqliteType;
    type MetadataLookup = ();
}

impl SupportsOnConflictClause for Sqlite {}
impl UsesAnsiSavepointSyntax for Sqlite {}