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// This Source Code Form is subject to the terms of
// the Mozilla Public License, v. 2.0. If a copy of
// the MPL was not distributed with this file, You
// can obtain one at http://mozilla.org/MPL/2.0/.

//! Generate random `cbor::Value`s.
//!
//! This module is only available with `--features="random"`.

use quickcheck::{Arbitrary, Gen};
use std::collections::{BTreeMap, LinkedList};
use types::Tag;
use value::{Int, Value, Simple, Key, Bytes, Text};

/// Generate a random `cbor::Value`.
/// Mostly useful for quickcheck related tests.
/// The parameter `level` denotes the maximum nesting of this value.
pub fn gen_value<G: Gen>(level: u16, g: &mut G) -> Value {
    match g.gen_range(0, 20) {
        0  => Value::Null,
        1  => Value::Undefined,
        2  => Value::U8(g.gen()),
        3  => Value::U16(g.gen()),
        4  => Value::U32(g.gen()),
        5  => Value::U64(g.gen()),
        6  => Value::I8(g.gen()),
        7  => Value::I16(g.gen()),
        8  => Value::I32(g.gen()),
        9  => Value::I64(g.gen()),
        10 => Value::F32(g.gen()),
        11 => Value::F64(g.gen()),
        12 => Value::Text(gen_text(g)),
        13 => Value::Bytes(gen_bytes(g)),
        14 => Value::Array(
                if level > 0 {
                    gen_array(level - 1, g)
                } else {
                    Vec::with_capacity(0)
                }),
        15 => Value::Bool(g.gen()),
        16 => Value::Simple(gen_simple(g)),
        17 => Value::Map(
                if level > 0 {
                    gen_map(level - 1, g)
                } else {
                    BTreeMap::new()
                }),
        18 => Value::Int(gen_int(g)),
        _ => gen_tagged(g)
    }
}

fn gen_array<G: Gen>(level: u16, g: &mut G) -> Vec<Value> {
    let     len = g.gen_range(0, 64);
    let mut vec = Vec::with_capacity(len);
    for _ in 0 .. len {
        vec.push(gen_value(level, g))
    }
    vec
}

fn gen_map<G: Gen>(level: u16, g: &mut G) -> BTreeMap<Key, Value> {
    let     len = g.gen_range(0, 64);
    let mut map = BTreeMap::new();
    for _ in 0 .. len {
        map.insert(gen_key(g), gen_value(level, g));
    }
    map
}

fn gen_key<G: Gen>(g: &mut G) -> Key {
    match g.gen_range(0, 4) {
        0 => Key::Int(gen_int(g)),
        1 => Key::Text(gen_text(g)),
        2 => Key::Bytes(gen_bytes(g)),
        _ => Key::Bool(g.gen()),
    }
}

fn gen_int<G: Gen>(g: &mut G) -> Int {
    if g.gen() {
        Int::Pos(g.gen())
    } else {
        Int::Neg(g.gen())
    }
}

fn gen_tag<G: Gen>(g: &mut G) -> Tag {
    match g.gen_range(0, 20) {
        0  => Tag::DateTime,
        1  => Tag::Timestamp,
        2  => Tag::Bignum,
        3  => Tag::NegativeBignum,
        4  => Tag::Decimal,
        5  => Tag::Bigfloat,
        6  => Tag::ToBase64Url,
        7  => Tag::ToBase64,
        8  => Tag::ToBase16,
        9  => Tag::Cbor,
        10 => Tag::Uri,
        11 => Tag::Base64Url,
        12 => Tag::Base64,
        13 => Tag::Regex,
        14 => Tag::Mime,
        15 => Tag::CborSelf,
        tg => Tag::Unassigned(tg)
    }
}

fn gen_text<G: Gen>(g: &mut G) -> Text {
    match g.gen() {
        true  => Text::Text(Arbitrary::arbitrary(g)),
        false => Text::Chunks(gen_chunks(g))
    }
}

fn gen_bytes<G: Gen>(g: &mut G) -> Bytes {
    match g.gen() {
        true  => Bytes::Bytes(Arbitrary::arbitrary(g)),
        false => Bytes::Chunks(gen_chunks(g))
    }
}

fn gen_chunks<A: Arbitrary, G: Gen>(g: &mut G) -> LinkedList<A> {
    let mut xs = LinkedList::new();
    for _ in 0 .. g.gen_range(0, 64) {
        xs.push_back(Arbitrary::arbitrary(g))
    }
    xs
}

fn gen_simple<G: Gen>(g: &mut G) -> Simple {
    match g.gen() {
        true => match g.gen() {
            n @ 0u8...19 | n @ 28...30 => Simple::Unassigned(n),
            n @ 32...255               => Simple::Unassigned(n),
            _                          => Simple::Unassigned(0)
        },
        false => match g.gen() {
            n @ 0u8...31 => Simple::Reserved(n),
            _            => Simple::Reserved(0)
        }
    }
}

fn gen_tagged<G: Gen>(g: &mut G) -> Value {
    match gen_tag(g) {
        t@Tag::DateTime  => Value::Tagged(t, Box::new(Value::Text(gen_text(g)))),
        t@Tag::Timestamp => match g.gen_range(0, 10) {
            0 => Value::Tagged(t, Box::new(Value::U8(g.gen()))),
            1 => Value::Tagged(t, Box::new(Value::U16(g.gen()))),
            2 => Value::Tagged(t, Box::new(Value::U32(g.gen()))),
            3 => Value::Tagged(t, Box::new(Value::U64(g.gen()))),
            4 => Value::Tagged(t, Box::new(Value::I8(g.gen()))),
            5 => Value::Tagged(t, Box::new(Value::I16(g.gen()))),
            6 => Value::Tagged(t, Box::new(Value::I32(g.gen()))),
            7 => Value::Tagged(t, Box::new(Value::I64(g.gen()))),
            8 => Value::Tagged(t, Box::new(Value::F32(g.gen()))),
            _ => Value::Tagged(t, Box::new(Value::F64(g.gen())))
        },
        t@Tag::Bignum         => Value::Tagged(t, Box::new(Value::Bytes(gen_bytes(g)))),
        t@Tag::NegativeBignum => Value::Tagged(t, Box::new(Value::Bytes(gen_bytes(g)))),
        t@Tag::Uri            => Value::Tagged(t, Box::new(Value::Text(gen_text(g)))),
        t@Tag::Base64         => Value::Tagged(t, Box::new(Value::Text(gen_text(g)))),
        t@Tag::ToBase64Url    => Value::Tagged(t, Box::new(Value::Text(gen_text(g)))),
        t@Tag::Regex          => Value::Tagged(t, Box::new(Value::Text(gen_text(g)))),
        t@Tag::Decimal        => Value::Tagged(t, Box::new(Value::Array(vec![Value::U64(g.gen()), Value::U64(g.gen())]))),
        t@Tag::Bigfloat       => Value::Tagged(t, Box::new(Value::Array(vec![Value::U64(g.gen()), Value::U64(g.gen())]))),
        _                     => Value::Tagged(Tag::Mime, Box::new(Value::Text(gen_text(g))))
    }
}