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use litl::{impl_debug_as_litl, Litl};
use ridl::signing::SignerSecret;
use serde_derive::{Deserialize, Serialize};
use thiserror::Error;

use crate::{
    log::{LogDiff, LogError, LogID, LogStateInfo, LogState, LogWriteAccess},
    set::{SetDiff, SetError, SetID, SetStateInfo, SetState, SetWriteAccess},
    telepathic::{ApplyDiffErrorFor, Telepathic, TelepathicDiff},
};

#[derive(Debug)]
pub enum ObjectState {
    Log(LogState),
    Set(SetState),
}

#[derive(Copy, Clone, PartialEq, Eq, Hash, Serialize, Deserialize)]
// #[serde(untagged)]
#[serde(rename_all = "camelCase")]
pub enum ObjectID {
    Log(LogID),
    Set(SetID),
}

impl_debug_as_litl!(ObjectID);

#[derive(Serialize, Deserialize)]
pub enum WriteAccess {
    Log(LogWriteAccess),
    Set(SetWriteAccess),
}

impl WriteAccess {
    pub fn id(&self) -> ObjectID {
        match self {
            WriteAccess::Log(write_access) => ObjectID::Log(write_access.log_id()),
            WriteAccess::Set(write_access) => ObjectID::Set(write_access.id()),
        }
    }
}

#[derive(Clone, Serialize, Deserialize, PartialEq, Eq, Debug)]
#[serde(untagged)]
pub enum StateInfo {
    Log(LogStateInfo),
    Set(SetStateInfo),
}

#[derive(Clone, Serialize, Deserialize)]
// #[serde(untagged)]
pub enum Diff {
    Log(LogDiff),
    Set(SetDiff),
}

impl_debug_as_litl!(Diff);

#[derive(Debug, Error)]
pub enum ObjectError {
    #[error(transparent)]
    Log(LogError),
    #[error(transparent)]
    Set(SetError),
}

impl Telepathic for ObjectState {
    type ID = ObjectID;
    type WriteAccess = WriteAccess;
    type StateInfo = StateInfo;
    type Diff = Diff;
    type Error = ObjectError;

    fn id(&self) -> Self::ID {
        match self {
            ObjectState::Log(log) => ObjectID::Log(log.id()),
            ObjectState::Set(set) => ObjectID::Set(set.id()),
        }
    }

    fn try_apply_diff(
        &mut self,
        diff: Self::Diff,
    ) -> Result<Self::StateInfo, ApplyDiffErrorFor<Self::Error>> {
        match (self, diff) {
            (ObjectState::Log(log), Diff::Log(delta)) => log
                .try_apply_diff(delta)
                .map(StateInfo::Log)
                .map_err(|e| match e {
                    ApplyDiffErrorFor::InvalidKnownStateAssumption => {
                        ApplyDiffErrorFor::InvalidKnownStateAssumption
                    }
                    ApplyDiffErrorFor::Other(e) => ApplyDiffErrorFor::Other(ObjectError::Log(e)),
                }),
            (ObjectState::Set(set), Diff::Set(delta)) => set
                .try_apply_diff(delta)
                .map(StateInfo::Set)
                .map_err(|e| match e {
                    ApplyDiffErrorFor::InvalidKnownStateAssumption => {
                        ApplyDiffErrorFor::InvalidKnownStateAssumption
                    }
                    ApplyDiffErrorFor::Other(e) => ApplyDiffErrorFor::Other(ObjectError::Set(e)),
                }),
            (s, diff) => unreachable!("Invalid object state/diff combination {s:?} {diff:?}"),
        }
    }

    fn state_info(&self) -> Option<Self::StateInfo> {
        match self {
            ObjectState::Log(log) => log.state_info().map(StateInfo::Log),
            ObjectState::Set(set) => set.state_info().map(StateInfo::Set),
        }
    }

    fn diff_since(&self, state_info: Option<&Self::StateInfo>) -> Option<Self::Diff> {
        match (self, state_info) {
            (ObjectState::Log(log), Some(StateInfo::Log(state_info))) => {
                log.diff_since(Some(state_info)).map(Diff::Log)
            }
            (ObjectState::Log(log), None) => log.diff_since(None).map(Diff::Log),
            (ObjectState::Set(set), Some(StateInfo::Set(state_info))) => {
                set.diff_since(Some(state_info)).map(Diff::Set)
            }
            (ObjectState::Set(set), None) => set.diff_since(None).map(Diff::Set),
            _ => unreachable!("Invalid object state/state_info combination {self:?} {state_info:?}"),
        }
    }
}

impl TelepathicDiff for Diff {
    type ID = ObjectID;

    fn id(&self) -> Self::ID {
        match self {
            Diff::Log(log) => ObjectID::Log(log.id),
            Diff::Set(set) => ObjectID::Set(set.id),
        }
    }
}

#[test]
fn object_id_serialization_roundtrips() {
    let id = ObjectID::Log(LogWriteAccess(SignerSecret::new_random()).log_id());
    let serialized = Litl::write_from(id);
    let deserialized: ObjectID = Litl::read_as(&serialized).unwrap();
    assert_eq!(id, deserialized);

    let id = ObjectID::Set(SetWriteAccess(SignerSecret::new_random()).id());
    let serialized = Litl::write_from(id);
    let deserialized: ObjectID = Litl::read_as(&serialized).unwrap();
    assert_eq!(id, deserialized);
}