//! In the following example, a <List Char> editor
//! as before is used, but its data is morphed into
//! representing a positional integer which is then
//! projected into different radices and displayed
//! in different views on screen

extern crate cgmath;
extern crate nested;
extern crate nested_tty;
extern crate r3vi;
extern crate termion;

use {
    cgmath::Vector2,
    nested::{
        editors::{
            ObjCommander
        },
        repr_tree::{Context, ReprTree, ReprTreeExt, ReprLeaf},
        edit_tree::{EditTree, TreeNav, TreeCursor}
    },
    nested_tty::{
        DisplaySegment, TTYApplication,
        TerminalCompositor, TerminalStyle, TerminalView,
        TerminalAtom, TerminalEvent
    },
    r3vi::{
        buffer::{singleton::*, vec::*},
        view::{port::UpdateTask, singleton::*, list::*, sequence::*},
        projection::*
    },
    std::sync::{Arc, RwLock},
};

fn rebuild_projections(
    ctx: Arc<RwLock<Context>>,
    repr_tree: Arc<RwLock<ReprTree>>,
    morph_types: Vec< (laddertypes::TypeTerm, laddertypes::TypeTerm) >
) {
    repr_tree.write().unwrap().detach(&ctx);
    for (src_type, dst_type) in morph_types.iter() {
        ctx.read().unwrap().morphisms.apply_morphism(
            repr_tree.clone(),
            &src_type,
            &dst_type
        );
    }
}

fn setup_le_master(ctx: &Arc<RwLock<Context>>, rt_int: &Arc<RwLock<ReprTree>>) {
    rebuild_projections(
        ctx.clone(),
        rt_int.clone(),
        vec![
            // Little Endian Editor
            (
             "ℕ ~ <PosInt 16 LittleEndian> ~ <Seq <Digit 16>> ~ <List <Digit 16> ~ Char> ~ EditTree",
             "ℕ ~ <PosInt 16 LittleEndian> ~ <Seq <Digit 16>> ~ <List <Digit 16> ~ Char>"
            ),

            // Convert Endianness
            (
             "ℕ ~ <PosInt 16 LittleEndian> ~ <Seq <Digit 16>> ~ <List <Digit 16> ~ Char>",
             "ℕ ~ <PosInt 16 BigEndian> ~ <Seq <Digit 16>> ~ <List <Digit 16> ~ Char>"
            ),

            // Big Endian Editor
            (
             "ℕ ~ <PosInt 16 BigEndian> ~ <Seq <Digit 16>> ~ <List <Digit 16> ~ Char>",
             "ℕ ~ <PosInt 16 BigEndian> ~ <Seq <Digit 16>> ~ <List <Digit 16> ~ Char ~ EditTree>"
            ),
            (
             "ℕ ~ <PosInt 16 BigEndian> ~ <Seq <Digit 16>> ~ <List <Digit 16> ~ Char ~ EditTree>",
             "ℕ ~ <PosInt 16 BigEndian> ~ <Seq <Digit 16>> ~ <List <Digit 16> ~ Char ~ EditTree> ~ <Vec EditTree>"
            ),
            (
             "ℕ ~ <PosInt 16 BigEndian> ~ <Seq <Digit 16>> ~ <List <Digit 16> ~ Char ~ EditTree> ~ <Vec EditTree>",
             "ℕ ~ <PosInt 16 BigEndian> ~ <Seq <Digit 16>> ~ <List <Digit 16> ~ Char> ~ EditTree"
            ),
           ].into_iter()
            .map(|(s,d)| (Context::parse(&ctx, s), Context::parse(&ctx, d)))
            .collect()
    );
/*
    
    /*
     * map seq of chars to seq of u64 digits
     * and add this projection to the ReprTree
     */
    //
    //VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVV
    let mut chars_view = rt_int.descend(Context::parse(&ctx, "
               <PosInt 16 BigEndian>
            ~  <Seq <Digit 16>>
            ~  <List <Digit 16>~Char>
        ")).expect("cant descend")
        .read().unwrap()
        .get_port::<dyn ListView<char>>()
        .unwrap();

    let mut digits_view = chars_view
        .to_sequence()
        .filter_map(
            |digit_char|

            /* TODO: call morphism for each item
             */
            match digit_char.to_digit(16) {
                Some(d) => Some(d as u64),
                None    => None
            }
        );

    rt_int.attach_leaf_to(Context::parse(&ctx, "
              <PosInt 16 BigEndian>
            ~ <Seq   <Digit 16>
                   ~ ℤ_2^64
                   ~ machine.UInt64 >
        "),
        digits_view.clone()
    );

    //ΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛ
    //
    */
}

fn setup_be_master(ctx: &Arc<RwLock<Context>>, rt_int: &Arc<RwLock<ReprTree>>) {
    rebuild_projections(
        ctx.clone(),
        rt_int.clone(),
        vec![
            // Big Endian Editor
            (
             "ℕ ~ <PosInt 16 BigEndian> ~ <Seq <Digit 16>> ~ <List <Digit 16> ~ Char> ~ EditTree",
             "ℕ ~ <PosInt 16 BigEndian> ~ <Seq <Digit 16>> ~ <List <Digit 16> ~ Char>"
            ),

            // Convert Endianness
            (
             "ℕ ~ <PosInt 16 BigEndian> ~ <Seq <Digit 16>> ~ <List <Digit 16> ~ Char>",
             "ℕ ~ <PosInt 16 LittleEndian> ~ <Seq <Digit 16>> ~ <List <Digit 16> ~ Char>"
            ),

            // Big Endian Editor
            (
             "ℕ ~ <PosInt 16 LittleEndian> ~ <Seq <Digit 16>> ~ <List <Digit 16> ~ Char>",
             "ℕ ~ <PosInt 16 LittleEndian> ~ <Seq <Digit 16>> ~ <List <Digit 16> ~ Char ~ EditTree>"
            ),
            (
             "ℕ ~ <PosInt 16 LittleEndian> ~ <Seq <Digit 16>> ~ <List <Digit 16> ~ Char ~ EditTree>",
             "ℕ ~ <PosInt 16 LittleEndian> ~ <Seq <Digit 16>> ~ <List <Digit 16> ~ Char ~ EditTree> ~ <Vec EditTree>"
            ),
            (
             "ℕ ~ <PosInt 16 LittleEndian> ~ <Seq <Digit 16>> ~ <List <Digit 16> ~ Char ~ EditTree> ~ <Vec EditTree>",
             "ℕ ~ <PosInt 16 LittleEndian> ~ <Seq <Digit 16>> ~ <List <Digit 16> ~ Char> ~ EditTree"
            ),
        ].into_iter()
            .map(|(s,d)| (Context::parse(&ctx, s), Context::parse(&ctx, d)))
            .collect()
    );

    /*
    /*
     * map seq of chars to seq of u64 digits
     * and add this projection to the ReprTree
     */
    //
    //VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVV
    let mut chars_view = rt_int.descend(Context::parse(&ctx, "
               <PosInt 16 BigEndian>
            ~  <Seq <Digit 16>>
            ~  <List <Digit 16>~Char>
        ")).expect("cant descend")
        .read().unwrap()
        .get_port::<dyn ListView<char>>()
        .unwrap();

    let mut digits_view = chars_view
        .to_sequence()
        .filter_map(
            |digit_char|

            /* TODO: call morphism for each item
             */
            match digit_char.to_digit(16) {
                Some(d) => Some(d as u64),
                None    => None
            }
        );

    rt_int.attach_leaf_to(Context::parse(&ctx, "
              <PosInt 16 BigEndian>
            ~ <Seq   <Digit 16>
                   ~ ℤ_2^64
                   ~ machine.UInt64 >
        "),
        digits_view.clone()
    );

    //ΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛ
    //
    */
}

#[async_std::main]
async fn main() {
    /* setup context
     */
    let ctx = Arc::new(RwLock::new(Context::new()));
    nested::editors::char::init_ctx( ctx.clone() );
    nested::editors::digit::init_ctx( ctx.clone() );
    nested::editors::integer::init_ctx( ctx.clone() );
    nested::editors::list::init_ctx( ctx.clone() );
    nested_tty::setup_edittree_hook(&ctx);

    /* Create a Representation-Tree of type `ℕ`
     */
    let mut rt_int = ReprTree::new_arc( Context::parse(&ctx, "ℕ") );

    /* Add a specific Representation-Path (big-endian hexadecimal)
     */
    let mut digits_be = VecBuffer::with_data(vec![ 'c', 'f', 'f' ]);
    rt_int.insert_leaf(
        Context::parse(&ctx, "<PosInt 16 BigEndian>~<Seq <Digit 16>>~<List <Digit 16>>~<List Char>~<Vec Char>"),
        nested::repr_tree::ReprLeaf::from_vec_buffer( digits_be.clone() )
    );

    let mut digits_le = VecBuffer::with_data(vec!['3', '2', '1']);
    rt_int.insert_leaf(
        Context::parse(&ctx, "<PosInt 16 LittleEndian>~<Seq <Digit 16>>~<List <Digit 16>>~<List Char>~<Vec Char>"),
        nested::repr_tree::ReprLeaf::from_vec_buffer( digits_le.clone() )
    );

    let mut digits_le_editvec = VecBuffer::<Arc<RwLock<EditTree>>>::new();
    rt_int.insert_leaf(
        Context::parse(&ctx, "
              <PosInt 16 LittleEndian>
            ~ <Seq <Digit 16>>
            ~ <List   <Digit 16>
                    ~ Char
                    ~ EditTree>
            ~ <Vec EditTree>
        "),
        nested::repr_tree::ReprLeaf::from_vec_buffer( digits_le_editvec.clone() )
    );

    let mut digits_be_editvec = VecBuffer::<Arc<RwLock<EditTree>>>::new();
    rt_int.insert_leaf(
        Context::parse(&ctx, "
              <PosInt 16 BigEndian>
            ~ <Seq <Digit 16>>
            ~ <List   <Digit 16>
                    ~ Char
                    ~ EditTree>
            ~ <Vec EditTree>
        "),
        nested::repr_tree::ReprLeaf::from_vec_buffer( digits_be_editvec.clone() )
    );

    /* initially copy values from Vec to EditTree...
     */
    rebuild_projections(
        ctx.clone(),
        rt_int.clone(),
        // master representation
        vec![
            (
             "ℕ ~ <PosInt 16 LittleEndian> ~ <Seq <Digit 16>> ~ <List <Digit 16> ~ Char> ~ <Vec Char>",
             "ℕ ~ <PosInt 16 LittleEndian> ~ <Seq <Digit 16>> ~ <List <Digit 16> ~ Char>"
            ),
            (
             "ℕ ~ <PosInt 16 LittleEndian> ~ <Seq <Digit 16>> ~ <List <Digit 16> ~ Char>",
             "ℕ ~ <PosInt 16 LittleEndian> ~ <Seq <Digit 16>> ~ <List <Digit 16> ~ Char ~ EditTree>"
            ),
            (
             "ℕ ~ <PosInt 16 LittleEndian> ~ <Seq <Digit 16>> ~ <List <Digit 16> ~ Char> ~ <List EditTree>",
             "ℕ ~ <PosInt 16 LittleEndian> ~ <Seq <Digit 16>> ~ <List <Digit 16> ~ Char> ~ <List EditTree> ~ <Vec EditTree>"
            ),
            (
             "ℕ ~ <PosInt 16 LittleEndian> ~ <Seq <Digit 16>> ~ <List <Digit 16> ~ Char> ~ <List EditTree> ~ <Vec EditTree>",
             "ℕ ~ <PosInt 16 LittleEndian> ~ <Seq <Digit 16>> ~ <List <Digit 16> ~ Char> ~ EditTree"
            ),
          ].into_iter()
            .map(|(s,d)| (Context::parse(&ctx, s), Context::parse(&ctx, d)))
            .collect()
    );

    setup_le_master(&ctx, &rt_int);

    let edittree_hex_le_list = ctx.read().unwrap()
        .setup_edittree(
            rt_int.descend(Context::parse(&ctx,"
                <PosInt 16 LittleEndian>
                ~ <Seq <Digit 16>>
                ~ <List <Digit 16>>
                ~ <List Char>
            ")).expect("descend"),
            SingletonBuffer::new(0).get_port()
        ).unwrap();
    let edittree_hex_be_list = ctx.read().unwrap()
        .setup_edittree(
            rt_int.descend(Context::parse(&ctx,"
                <PosInt 16 BigEndian>
                ~ <Seq <Digit 16>>
                ~ <List <Digit 16>>
                ~ <List Char>
            ")).expect("descend"),
            SingletonBuffer::new(0).get_port()
        ).unwrap();

    /* list of both editors
     */
    let mut list_editor = nested::editors::list::ListEditor::new(ctx.clone(), Context::parse(&ctx, "<Seq Char>"));
    list_editor.data.push( edittree_hex_be_list.value.clone() );
    list_editor.data.push( edittree_hex_le_list.value.clone() );
    let mut edittree = list_editor.into_node(SingletonBuffer::new(0).get_port());

    /* cursors are a bit screwed initially so fix them up
     * TODO: how to fix this generally?
     */
    edittree_hex_be_list.get().goto(TreeCursor::none());
    edittree_hex_le_list.get().goto(TreeCursor::none());
    edittree.goto(TreeCursor{
        leaf_mode: nested::editors::list::ListCursorMode::Insert,
        tree_addr: vec![1,0]
    });
    let edittree = Arc::new(RwLock::new(edittree));
 
    /* setup terminal
     */
    let app = TTYApplication::new({
        /* event handler
         */
        let ctx = ctx.clone();
        let rt_int = rt_int.clone();
        let last_idx = RwLock::new(1);
        move |ev| {

            let cur = edittree.read().unwrap().get_cursor();
            if cur.tree_addr.len() > 0 {
                match cur.tree_addr[0] {
                    0 => {
                        let mut li = last_idx.write().unwrap();
                        if *li != 0 {
                            setup_be_master(&ctx, &rt_int);
                            *li = 0;
                        }
                    }
                    1 => {
                        let mut li = last_idx.write().unwrap();
                        if *li != 1 {
                            setup_le_master(&ctx, &rt_int);
                            *li = 1;
                        }
                    }
                    _=>{}
                }
            }

            edittree.write().unwrap().send_cmd_obj(ev.to_repr_tree(&ctx));
        }
    });

    /* Setup the compositor to serve as root-view
     * by routing it to the `app.port` Viewport,
     * so it will be displayed on TTY-output.
     */
    let compositor = TerminalCompositor::new(app.port.inner());
    
    /* Now add some views to our compositor
     */
    {
        let mut comp = compositor.write().unwrap();

        fn show_edit_tree( ctx: &Arc<RwLock<Context>>, comp: &mut TerminalCompositor, rt: &Arc<RwLock<ReprTree>>, y: i16 )
        {
            let rt_edittree = rt.descend(Context::parse(&ctx, "EditTree")).expect("descend");
            let halo_type = rt_edittree.read().unwrap().get_halo_type().clone();
            let edittree = rt_edittree.read().unwrap().get_view::<dyn r3vi::view::singleton::SingletonView<Item = EditTree>>().unwrap().get();

            comp.push(  nested_tty::make_label( &ctx.read().unwrap().type_term_to_str(&halo_type) ) 
                .map_item(|_pt, atom| atom.add_style_front(TerminalStyle::fg_color((90,90,90))))
                .offset(Vector2::new(1,y)));

            comp.push(  edittree.display_view()
                .offset(Vector2::new(1,y+1)));
        }

        show_edit_tree(&ctx, &mut comp, &rt_int.descend(Context::parse(&ctx, "<PosInt 16 BigEndian> ~ <Seq~List <Digit 16>~Char>")).expect(""), 1);
        show_edit_tree(&ctx, &mut comp, &rt_int.descend(Context::parse(&ctx, "<PosInt 16 LittleEndian> ~ <Seq <Digit 16>> ~ <List <Digit 16>~Char>")).expect(""), 4);

        /* project the seq of u64 representations to a view
         */
        /*
        comp.push(nested_tty::make_label("dec: ").offset(Vector2::new(3,7)));
        comp.push(dec_digits_view.offset(Vector2::new(8,7)).map_item(|_,a| {
            a.add_style_back(TerminalStyle::fg_color((30,90,200)))
        }));
        */
        /*
        comp.push(nested_tty::make_label("hex: ").offset(Vector2::new(3,8)));
        comp.push(hex_digits_view.offset(Vector2::new(8,8)).map_item(|_,a| {
            a.add_style_back(TerminalStyle::fg_color((200, 200, 30)))
        }));
        */
    }

    /* write the changes in the view of `term_port` to the terminal
     */
    app.show().await.expect("output error!");
}