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// RGB Core Library: consensus layer for RGB smart contracts.
//
// SPDX-License-Identifier: Apache-2.0
//
// Written in 2019-2023 by
//     Dr Maxim Orlovsky <orlovsky@lnp-bp.org>
//
// Copyright (C) 2019-2023 LNP/BP Standards Association. All rights reserved.
// Copyright (C) 2019-2023 Dr Maxim Orlovsky. All rights reserved.
//
// Licensed 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.

use strict_encoding::constants::U64;
use strict_types::SemId;

use crate::{StateType, LIB_NAME_RGB};

#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Debug, Display)]
#[derive(StrictType, StrictDumb, StrictEncode, StrictDecode)]
#[strict_type(lib = LIB_NAME_RGB, tags = repr, into_u8, try_from_u8)]
#[cfg_attr(
    feature = "serde",
    derive(Serialize, Deserialize),
    serde(crate = "serde_crate", rename_all = "camelCase")
)]
#[non_exhaustive]
#[repr(u8)]
pub enum MediaType {
    #[display("*/*")]
    #[strict_type(dumb)]
    Any = 0xFF,
    // TODO: Complete MIME type implementation
}

impl MediaType {
    pub fn conforms(&self, other: &MediaType) -> bool {
        match (self, other) {
            (MediaType::Any, MediaType::Any) => true,
        }
    }
}

#[derive(Copy, Clone, PartialEq, Eq, Debug)]
#[derive(StrictType, StrictDumb, StrictEncode, StrictDecode)]
#[strict_type(lib = LIB_NAME_RGB, tags = order)]
#[cfg_attr(
    feature = "serde",
    derive(Serialize, Deserialize),
    serde(crate = "serde_crate", rename_all = "camelCase")
)]
pub enum StateSchema {
    #[strict_type(dumb)]
    Declarative,
    Fungible(FungibleType),
    Structured(SemId),
    Attachment(MediaType),
}

impl StateSchema {
    pub fn state_type(&self) -> StateType {
        match self {
            StateSchema::Declarative => StateType::Void,
            StateSchema::Fungible(_) => StateType::Fungible,
            StateSchema::Structured(_) => StateType::Structured,
            StateSchema::Attachment(_) => StateType::Attachment,
        }
    }
}

/// Today we support only a single format of confidential data, because of the
/// limitations of the underlying secp256k1-zkp library: it works only with
/// u64 numbers. Nevertheless, homomorphic commitments can be created to
/// everything that has up to 256 bits and commutative arithmetics, so in the
/// future we plan to support more types. We reserve this possibility by
/// internally encoding [`ConfidentialFormat`] with the same type specification
/// details as used for [`DateFormat`]
#[derive(Copy, Clone, PartialEq, Eq, Debug, Default, Display)]
#[derive(StrictType, StrictEncode, StrictDecode)]
#[strict_type(lib = LIB_NAME_RGB, tags = repr, into_u8, try_from_u8)]
#[cfg_attr(
    feature = "serde",
    derive(Serialize, Deserialize),
    serde(crate = "serde_crate", rename_all = "camelCase")
)]
#[repr(u8)]
pub enum FungibleType {
    #[default]
    #[display("64bit")]
    Unsigned64Bit = U64.into_code(),
}

#[derive(Clone, PartialEq, Eq, Hash, Debug)]
#[derive(StrictType, StrictDumb, StrictEncode, StrictDecode)]
#[strict_type(lib = LIB_NAME_RGB)]
#[cfg_attr(
    feature = "serde",
    derive(Serialize, Deserialize),
    serde(crate = "serde_crate", rename_all = "camelCase")
)]
pub struct GlobalStateSchema {
    pub sem_id: SemId,
    pub max_items: u16,
}

impl GlobalStateSchema {
    pub fn once(sem_id: SemId) -> Self {
        GlobalStateSchema {
            sem_id,
            max_items: 1,
        }
    }

    pub fn many(sem_id: SemId) -> Self {
        GlobalStateSchema {
            sem_id,
            max_items: u16::MAX,
        }
    }
}