"""
map_headers[0].tileset == 'OVERWORLD'
map_headers[0].name1 = 'PalletTown'
map_headers[0].name2 = 'PALLET_TOWN'
map_headers[0].blocks() == 'PalletTown_Blocks'
map_constants_list['PALLET_TOWN'] == MapConstant(10, 19)
maps_blocks_list['PalletTown_Blocks'] == 'maps/PalletTown.blk'
tileset_constants_list['OVERWORLD'] == 0
tileset_headers_list[0].name == 'Overworld'
tileset_headers_list[0].blockset() == 'Overworld_Block'
tileset_headers_list[0].gfx() == 'Overworld_GFX'
gfx_tilesets_list['Overworld_Block'] == 'gfx/blocksets/overworld.bst'
gfx_tilesets_list['Overworld_GFX'] == 'gfx/tilesets/overworld.2bpp'
"""

from parse import parse

from generate.sort import default_sort
from generate.binary import binary_res, start_size_value
from generate.generate import renderer

from parse.map_header import Connection

directions = sorted(['north', 'south', 'east', 'west'])

def sorted_map_constants_list():
    return sorted(parse.map_constants_list.items(), key=default_sort)

def sorted_map_headers():
    map_constants_list = sorted_map_constants_list()
    map_headers_dict = dict((map_header.name2, map_header) for map_header in parse.map_headers)
    # hack to remove unused/duplicate underground_path_route_7
    #map_headers = sorted(parse.map_headers, key=lambda m: m.name2)
    #return filter(lambda m: m.name1 != "UndergroundPathRoute7Copy", map_headers)
    return (
        map_headers_dict[map_name2] for map_name2, _ in map_constants_list
        if map_name2 in map_headers_dict
        # e.g CERULEAN_TRASHED_HOUSE_COPY has no map header
    )

def includes_header():
    yield "#pragma once"
    yield ""
    yield '#include "../start_size.hpp"'
    yield '#include "tilesets.hpp"'
    yield ""
    for map_header in sorted_map_headers():
        block_path = parse.maps_blocks_list[map_header.blocks()]
        yield f'#include "../res/{block_path}.h"'
    yield ""

def struct_map_t():
    _sorted_map_headers = list(sorted_map_headers())
    map_names = (
        f"{map_header.name2.lower()},"
        for map_header in _sorted_map_headers
    )
    return [
        "struct map_t {",
            "enum map {",
                *map_names,
                "last_map, // special map name",
                "unused_map_ed, // special silph co elevator map name",
                "unconnected, // special unconnected map",
            "};",
            "",
            *struct_connection_t(),
            "",
            "start_size_t blocks;",
            "uint32_t width;",
            "uint32_t height;",
            "connection_t connections[4];",
            "enum tileset_t::tileset tileset;",
            "enum map id;",
            "",
            f"static constexpr int32_t count = {len(_sorted_map_headers)};",
        "};",
    ]

def struct_connection_t():
    return [
        "struct connection_t {",
            "enum map_t::map map;",
            "int8_t offset;",
            "",
            "enum direction {",
                *(f"{d}," for d in directions),
            "};",
        "};",
    ]

def connections(map_header):
    cs = dict((c.name, c) for c in map_header.connections)
    assert len(cs) == len(map_header.connections), map_header.connections

    unconnected = Connection(
        name = "__invalid",
        map_name1 = "Unconnected",
        map_name2 = "unconnected",
        offset = 0,
    )

    for direction in directions: # already sorted
        connection = cs.get(direction, unconnected)

        yield f"[map_t::connection_t::{direction}] = {{"
        yield     f".map = map_t::{connection.map_name2.lower()},"
        yield     f".offset = {connection.offset},"
        yield "},"
    
def map(map_header):
    block_path = parse.maps_blocks_list[map_header.blocks()]
    map_constant = parse.map_constants_list[map_header.name2]
    return [
        f"[map_t::{map_header.name2.lower()}] = {{",
            ".blocks = {",
                *start_size_value(block_path),
            "},",
            f".width = {map_constant.width},",
            f".height = {map_constant.height},",
            ".connections = {",
                *connections(map_header),
            "},",
            f".tileset = tileset_t::{map_header.tileset.lower()},",
            f".id = map_t::{map_header.name2.lower()},",
        "},",
    ]

def extern_maps():
    yield "extern const map_t maps[];"

def maps():
    yield "const map_t maps[] = {"
    for map_header in sorted_map_headers():
        yield from map(map_header)
    yield "};"

def generate_header():
    render, out = renderer()
    render(includes_header())
    render(struct_map_t())
    render(extern_maps());
    return out

def includes_source():
    yield '#include <cstdint>'
    yield ''
    yield '#include "maps.hpp"'
    yield ''

def generate_source():
    render, out = renderer()
    render(includes_source())
    render(maps())
    return out