use rand::{thread_rng, Rng};

use mpstthree::binary::struct_trait::{end::End, recv::Recv, send::Send, session::Session};
use mpstthree::functionmpst::fork::fork_mpst;
use mpstthree::meshedchannels::MeshedChannels;
use mpstthree::role::broadcast::RoleBroadcast;

use mpstthree::{checker_concat, checker_concat_impl};

// use std::boxed::Box;
use std::error::Error;

// Get roles
use mpstthree::role::a::RoleA;
use mpstthree::role::b::RoleB;
use mpstthree::role::c::RoleC;
use mpstthree::role::end::RoleEnd;

use mpstthree::name::a::NameA;
use mpstthree::name::b::NameB;
use mpstthree::name::c::NameC;

use mpstthree::choose_mpst_b_to_all;
use mpstthree::offer_mpst_a_to_b;
use mpstthree::offer_mpst_c_to_b;

use petgraph::dot::Dot;

// Test our usecase
// Simple types
// Client = B
// Authenticator = C
// Server = A

type CtoBClose = End;
type CtoAClose = End;
type CtoAVideo = Send<i32, Recv<i32, End>>;
type CtoBVideo = Recv<i32, Send<i32, RecursCtoB>>;

type InitC = Recv<i32, Send<i32, RecursCtoB>>;

type AtoCClose = <CtoAClose as Session>::Dual;
type AtoBClose = End;
type AtoCVideo = <CtoAVideo as Session>::Dual;

type RecursCtoB = Recv<Branches0CtoB, End>;
type RecursAtoB = Recv<Branches0AtoB, End>;

enum Branches0CtoB {
    End(MeshedChannels<CtoAClose, CtoBClose, StackCEnd, NameC>),
    Video(MeshedChannels<CtoAVideo, CtoBVideo, StackCVideo, NameC>),
}
enum Branches0AtoB {
    End(MeshedChannels<AtoBClose, AtoCClose, StackAEnd, NameA>),
    Video(MeshedChannels<RecursAtoB, AtoCVideo, StackAVideo, NameA>),
}
type Choose0fromBtoC = Send<Branches0CtoB, End>;
type Choose0fromBtoA = Send<Branches0AtoB, End>;

type InitB = Send<i32, Recv<i32, Choose0fromBtoC>>;

// Stacks
type StackCEnd = RoleEnd;
type StackCVideo = RoleB<RoleA<RoleA<RoleB<RoleB<RoleEnd>>>>>;
type StackCRecurs = RoleB<RoleEnd>;
type StackCInit = RoleB<RoleB<RoleB<RoleEnd>>>;

type StackAEnd = RoleEnd;
type StackAVideo = RoleC<RoleC<RoleB<RoleEnd>>>;
type StackARecurs = RoleB<RoleEnd>;

type StackBRecurs = RoleBroadcast;
type StackBFull = RoleC<RoleC<StackBRecurs>>;

// Creating the MP sessions

// For B
type EndpointBEnd = MeshedChannels<End, End, RoleEnd, NameB>;
type EndpointBVideo = MeshedChannels<
    Send<Branches0AtoB, End>,
    Send<i32, Recv<i32, Send<Branches0CtoB, End>>>,
    RoleC<RoleC<RoleBroadcast>>,
    NameB,
>;
type EndpointBRecurs = MeshedChannels<Choose0fromBtoA, Choose0fromBtoC, StackBRecurs, NameB>;
type EndpointBFull = MeshedChannels<Choose0fromBtoA, InitB, StackBFull, NameB>;

// For C
type EndpointCRecurs = MeshedChannels<End, RecursCtoB, StackCRecurs, NameC>;
type EndpointCFull = MeshedChannels<End, InitC, StackCInit, NameC>;

// For A
type EndpointAFull = MeshedChannels<RecursAtoB, End, StackARecurs, NameA>;

// Functions related to endpoints
fn server(s: EndpointAFull) -> Result<(), Box<dyn Error>> {
    offer_mpst_a_to_b!(s, {
        Branches0AtoB::End(s) => {
            s.close()
        },
        Branches0AtoB::Video(s) => {
            let (request, s) = s.recv()?;
            let s = s.send(request + 1);
            server(s)
        },
    })
}

fn authenticator(s: EndpointCFull) -> Result<(), Box<dyn Error>> {
    let (id, s) = s.recv()?;
    let s = s.send(id + 1);

    authenticator_recurs(s)
}

fn authenticator_recurs(s: EndpointCRecurs) -> Result<(), Box<dyn Error>> {
    offer_mpst_c_to_b!(s, {
        Branches0CtoB::End(s) => {
            s.close()
        },
        Branches0CtoB::Video(s) => {
            let (request, s) = s.recv()?;
            let (video, s) = s.send(request + 1).recv()?;
            let s = s.send(video + 1);
            authenticator_recurs(s)
        },
    })
}

fn client(s: EndpointBFull) -> Result<(), Box<dyn Error>> {
    let xs: Vec<i32> = (1..100).map(|_| thread_rng().gen()).collect();

    let (_, s) = s.send(0).recv()?;

    client_recurs(s, xs, 1)
}

fn client_recurs(s: EndpointBRecurs, mut xs: Vec<i32>, index: i32) -> Result<(), Box<dyn Error>> {
    match xs.pop() {
        Option::Some(_) => {
            let s: EndpointBFull =
                choose_mpst_b_to_all!(s, Branches0AtoB::Video, Branches0CtoB::Video);

            let (_, s) = s.send(1).recv()?;

            client_recurs(s, xs, index + 1)
        }
        Option::None => {
            let s = choose_mpst_b_to_all!(s, Branches0AtoB::End, Branches0CtoB::End);

            assert_eq!(index, 100);

            s.close()
        }
    }
}

/////////////////////////////////////////

pub fn run_b_usecase_recursive() {
    let (thread_a, thread_b, thread_c) = fork_mpst(server, client, authenticator);

    assert!(thread_a.join().is_ok());
    assert!(thread_b.join().is_ok());
    assert!(thread_c.join().is_ok());
}

checker_concat_impl!(
    [Branches0CtoB, Video, Branches0AtoB, Video],
    [Branches0CtoB, End, Branches0AtoB, End]
);

pub fn run_b_usecase_recursive_checker() {
    let (graphs, kmc) = checker_concat!(
        "",
        EndpointAFull,
        EndpointCFull,
        EndpointBFull
        =>
        [
            EndpointBVideo,
            Branches0CtoB, Video,
            Branches0AtoB, Video
        ],
        [
            EndpointBEnd,
            Branches0CtoB, End,
            Branches0AtoB, End
        ]
    )
    .unwrap();

    ////////////// Test graph A
    let graph_a = &graphs["RoleA"];

    assert_eq!(
        format!("{:?}", Dot::new(&graph_a)),
        "digraph {\n    \
            0 [ label = \"\\\"0\\\"\" ]\n    \
            1 [ label = \"\\\"0.1\\\"\" ]\n    \
            2 [ label = \"\\\"0.1\\\"\" ]\n    \
            3 [ label = \"\\\"0.2\\\"\" ]\n    \
            0 -> 1 [ label = \"\\\"0\\\"\" ]\n    \
            0 -> 2 [ label = \"\\\"RoleA?RoleC: i32\\\"\" ]\n    \
            2 -> 3 [ label = \"\\\"RoleA!RoleC: i32\\\"\" ]\n    \
            3 -> 0 [ label = \"\\\"µ\\\"\" ]\n\
        }\n"
    );

    ////////////// Test graph B
    let graph_b = &graphs["RoleB"];

    assert_eq!(
        format!("{:?}", Dot::new(&graph_b)),
        "digraph {\n    \
            0 [ label = \"\\\"0\\\"\" ]\n    \
            1 [ label = \"\\\"1\\\"\" ]\n    \
            2 [ label = \"\\\"2\\\"\" ]\n    \
            3 [ label = \"\\\"2.1\\\"\" ]\n    \
            4 [ label = \"\\\"2.1\\\"\" ]\n    \
            5 [ label = \"\\\"2.2\\\"\" ]\n    \
            0 -> 1 [ label = \"\\\"RoleB!RoleC: i32\\\"\" ]\n    \
            1 -> 2 [ label = \"\\\"RoleB?RoleC: i32\\\"\" ]\n    \
            2 -> 3 [ label = \"\\\"0\\\"\" ]\n    \
            2 -> 4 [ label = \"\\\"RoleB!RoleC: i32\\\"\" ]\n    \
            4 -> 5 [ label = \"\\\"RoleB?RoleC: i32\\\"\" ]\n    \
            5 -> 2 [ label = \"\\\"µ\\\"\" ]\n\
        }\n"
    );

    ////////////// Test graph C
    let graph_c = &graphs["RoleC"];

    assert_eq!(
        format!("{:?}", Dot::new(&graph_c)),
        "digraph {\n    \
            0 [ label = \"\\\"0\\\"\" ]\n    \
            1 [ label = \"\\\"1\\\"\" ]\n    \
            2 [ label = \"\\\"2\\\"\" ]\n    \
            3 [ label = \"\\\"2.1\\\"\" ]\n    \
            4 [ label = \"\\\"2.1\\\"\" ]\n    \
            5 [ label = \"\\\"2.2\\\"\" ]\n    \
            6 [ label = \"\\\"2.3\\\"\" ]\n    \
            7 [ label = \"\\\"2.4\\\"\" ]\n    \
            0 -> 1 [ label = \"\\\"RoleC?RoleB: i32\\\"\" ]\n    \
            1 -> 2 [ label = \"\\\"RoleC!RoleB: i32\\\"\" ]\n    \
            2 -> 3 [ label = \"\\\"0\\\"\" ]\n    \
            2 -> 4 [ label = \"\\\"RoleC?RoleB: i32\\\"\" ]\n    \
            4 -> 5 [ label = \"\\\"RoleC!RoleA: i32\\\"\" ]\n    \
            5 -> 6 [ label = \"\\\"RoleC?RoleA: i32\\\"\" ]\n    \
            6 -> 7 [ label = \"\\\"RoleC!RoleB: i32\\\"\" ]\n    \
            7 -> 2 [ label = \"\\\"µ\\\"\" ]\n\
        }\n"
    );

    ////////////// Test KMC output
    assert_eq!(kmc, None);
}