import {
    world,
} from "./index.js";

import {
    available_tiles,
} from "/stackline-wasm/pkg/stackline_wasm.js";

const right_pane = document.getElementById("right-pane");
const coordinates_elem = document.getElementById("coordinates");
const stack_elem = document.getElementById("stack");
const signal_elem = document.getElementById("signal");
const state_elem = document.getElementById("state");
const tile_elem = document.getElementById("tile");
const tile_name_elem = document.getElementById("tile-name");
const properties_elem = document.getElementById("tile-properties");

let templates = new Map();

export function update_selected(x, y) {
    coordinates.innerText = `(${x}, ${y})`;

    let full_tile = world.get(x, y);

    if (!full_tile) {
        right_pane.classList.remove("selected");
        return;
    }

    let signal = full_tile.signal;
    while (stack_elem.children.length > 0) {
        stack_elem.removeChild(stack_elem.firstChild);
    }

    if (signal) {
        signal_elem.classList.add("has-signal");
        for (let element of signal.stack) {
            let li = document.createElement("li");
            if (typeof element === "string") {
                li.innerText = `"${element}"`;
            } else if (typeof element === "number") {
                li.innerText = element.toString();
            } else {
                throw new Error("Unexpected element type: " + typeof element);
            }
            stack_elem.appendChild(li);
        }

        signal.free();
    } else {
        signal_elem.classList.remove("has-signal");
    }

    let tile = full_tile.tile;
    if (tile) {
        tile_elem.classList.add("has-tile");

        let name = Object.keys(tile)[0];
        tile_name_elem.innerText = name;

        // Set properties
        // TODO: only change the properties when necessary

        while (properties_elem.children.length > 0) {
            properties_elem.removeChild(properties_elem.firstChild);
        }

        let schema = full_tile.schema();

        for (let [label, type, value] of schema_iter(schema, tile[name])) {
            let input = create_input(type, value, on_change);

            if (!input) continue;

            let elem = document.createElement("li");
            let label_elem = document.createElement("b");
            label_elem.innerText = `${label}: `;
            elem.appendChild(label_elem);

            elem.appendChild(input);
            properties_elem.appendChild(elem);

            function on_change(new_value) {
                // Traverse `tile` and change the corresponding schema element
                tile[name] = schema_recurse(schema, tile[name], label, new_value);

                let full_tile = world.get(x, y);
                full_tile.tile = tile;
                world.set(x, y, full_tile);
            }
        }
    } else {
        tile_elem.classList.remove("has-tile");
    }

    state_elem.innerText = full_tile.state;

    full_tile.free();

    right_pane.classList.add("selected");
}

export function init() {
    // for (let name of available_tiles()) {
    //     let option = document.createElement("option");
    //     option.innerText = name;
    //     option.value = name;
    //     tile_name_elem.appendChild(option);
    // }

    document.querySelectorAll(".property-template").forEach((template) => {
        templates.set(template.attributes?.name?.value ?? template.id, template);
    });
}

function* schema_iter(schema, tile) {
    if (Array.isArray(schema)) {
        for (let n = 0; n < schema.length; n++) {
            yield* schema_iter(schema[n], tile[n]);
        }
    } else if (typeof schema === "object") {
        for (let name in schema) {
            yield* schema_iter(schema[name], tile[name]);
        }
    } else if (typeof schema === "string") {
        let res = schema.split(":");
        res.push(tile);
        yield res;
    }
}

function schema_recurse(schema, tile, label, value) {
    if (Array.isArray(schema)) {
        for (let n = 0; n < schema.length; n++) {
            tile[n] = schema_recurse(schema[n], tile[n], label, value);
        }
        return tile;
    } else if (typeof schema === "object") {
        for (let name in schema) {
            tile[name] = schema_recurse(schema[name], tile[name], label, value);
        }
        return tile;
    } else if (typeof schema === "string") {
        if (schema.split(":")[0] === label) {
            return value;
        } else {
            return tile;
        }
    }
}

function create_input(type, value, change_cb) {
    let options = type.split("|");

    for (let option of options) {
        if (option === "Value") {
            let res = templates.get("Value").content.cloneNode(true).querySelector("*");

            let select_elem = res.querySelector("select");
            let type = Object.keys(value)[0];
            set_type(type);

            function set_type(new_type) {
                let map = new Map([["String", "string"], ["Number", "number"]]);
                for (let [ty, cn] of map) {
                    if (ty === new_type) {
                        res.classList.add(cn);
                    } else {
                        res.classList.remove(cn);
                    }
                }
                type = new_type;
            }

            select_elem.addEventListener("change", () => {
                set_type(select_elem.value);

                if (type === "Number") {
                    value = {"Number": 0.0};
                    number_input.value = 0;
                } else if (type === "String") {
                    value = {"String": ""};
                    string_input.value = "";
                }

                change_cb(value);
            });

            let number_input = res.querySelector(".value-number input");

            if (type === "Number") {
                number_input.value = value["Number"];
            }

            number_input.addEventListener("change", (evt) => {
                if (type === "Number") {
                    value["Number"] = +number_input.value;
                    change_cb(value);
                }
            });

            let string_input = res.querySelector(".value-string input");

            if (type === "String") {
                string_input.value = value["String"];
            }

            string_input.addEventListener("change", (evt) => {
                if (type === "String") {
                    value["String"] = string_input.value;
                    change_cb(value);
                }
            });

            return res;
        } else if (option === "Uint" || option === "Int") {
            let res = templates.get(option).content.cloneNode(true).querySelector("*");

            if (value !== undefined) {
                res.value = value;
            }

            res.addEventListener("change", () => {
                change_cb(+res.value);
            });

            return res;
        } else if (option === "Signal") {
            let res = templates.get(option).content.cloneNode(true).querySelector("*");

            let stack_elem = res.querySelector(".stack");

            for (let elem of value.stack) {
                let li = document.createElement("li");

                if (elem["Number"]) {
                    li.innerText = elem["Number"];
                } else if (elem["String"]) {
                    li.innerText = `"${elem["String"]}"`;
                }

                stack_elem.appendChild(li);
            }

            let direction_elem = res.querySelector(".direction");
            direction_elem.value = value.direction;

            return res;
        }

        if (templates.has(option)) {
            let res = templates.get(option).content.cloneNode(true).querySelector("*");

            if (value !== undefined) {
                res.value = value;
            }

            res.addEventListener("change", () => {
                change_cb(res.value);
            });

            return res;
        }
    }
}