import { IgniteHtml } from '../ignite-html/ignite-html.js';
import { IgniteElement } from "../ignite-html/ignite-element.js";
import { IgniteTemplate, button, ul, slot, span, div, i, html, list, converter } from "../ignite-html/ignite-template.js";
import { IgniteProperty } from "../ignite-html/ignite-html.js";
import { Popper } from "./popper.js";

class SearchSelect extends IgniteElement {
    constructor() {
        super();
    }

    get properties() {
        return {
            inputElement: null,
            placeholder: null,
            options: null,
            optionConverter: null,
            results: null,
            value: null,
            valueConverter: null,
            searchSelector: null,
            searchCallback: null,
            searchDelay: 200,
            searching: false,
            documentListener: null,
            maxResults: -1,
            resultsMaxHeight: "15em",
            onEnter: null
        };
    }

    render() {
        return this.template
            .class("w-100 position-relative form-control form-control-lg d-flex flex-row justify-content-between align-items-center")
            .attribute("tabindex", "0")
            .onFocus(() => this.onFocus())
            .child(
                //Search icon
                new button()
                    .class("btn btn-none ps-0")
                    .child(new i().class("fa-solid fa-magnifying-glass")),

                //Placeholder
                new div()
                    .hide([this.value, this.searching], (value, searching) => value || searching)
                    .class("cursor-pointer")
                    .style("flex", 1)
                    .style("opacity", "0.5")
                    .style("overflow", "auto")
                    .innerText(this.placeholder),

                //Search input
                new div()
                    .show(this.searching)
                    .style("flex", 1)
                    .style("border", "none")
                    .style("outline", "none")
                    .style("overflow", "auto")
                    .attribute("contenteditable", true)
                    .ref(this.inputElement)
                    .onFocus(() => this.onFocus())
                    .on("keydown", (e) => {
                        //If the enter key is pressed, prevent it from doing anything.
                        if (e.key == "Enter") {
                            e.preventDefault();
                            e.stopPropagation();

                            if (this.onEnter) {
                                this.onEnter(e.target.textContent);
                            }

                            this.searching = false;
                            this.inputElement.blur();
                            this.inputElement.textContent = null;
                            e.preventDefault();
                            e.stopPropagation();

                            return;
                        }

                        //If the escape key is pressed stop searching until something else happens.
                        if (e.key == "Escape") {
                            this.searching = false;
                            this.inputElement.blur();
                            this.inputElement.textContent = null;
                            e.preventDefault();
                            e.stopPropagation();

                            return;
                        }

                        //Reset the searching and input if we get a tab, since the browser
                        //will focus the next avaiable element.
                        if (e.key == "Tab") {
                            this.searching = false;
                            this.inputElement.blur();
                            this.inputElement.textContent = null;
                            return;
                        }

                        //If we are not searching and a key was pressed, open the search box.
                        if (!this.searching && (e.key !== "Backspace" || (e.key == "Backspace" && e.target.textContent.length > 1)) && this.options && this.options.length > 0) {
                            this.searching = true;
                        }

                        //If we are searching and we have a on search function invoke it.
                        if (this.searching) {
                            if (this.searchCallback) {
                                clearTimeout(this.searchCallback);
                            }

                            this.searchCallback = setTimeout(() => this.search(e.target.textContent.trim()), this.searchDelay);
                        }
                    }),

                //Value
                new div().show(this.value).child(
                    new converter(this.value, this.valueConverter)
                ),

                //Clear value button
                new button().show(this.value)
                    .class("btn btn-none")
                    .child(new i().class("fa-solid fa-times"))
                    .onClick(() => {
                        this.value = null;

                        this.dispatchEvent(new Event("change"));

                        this.onFocus();
                    }),

                //Search results popper
                new Popper()
                    .class("form-control form-control-lg shadow d-flex flex-column gap-3 overflow-auto p-3")
                    .style("max-height", this.resultsMaxHeight)
                    .property("show", this.searching)
                    .child(
                        new span().class("text-muted").innerText(this.results, results => results && results.length > 0 ? `Showing ${results.length} ${results.length == 1 ? "result" : "results"}` : "No results"),

                        new list(this.results, option =>
                            new div()
                                .class("cursor-pointer")
                                .child(
                                    new converter(option, this.optionConverter)
                                )
                                .onClick(e => {
                                    e.preventDefault();
                                    e.stopPropagation();

                                    this.value = option;

                                    this.searching = false;

                                    //Dispatch native change event so this acts like a native control
                                    this.dispatchEvent(new Event("change"));
                                })
                        )
                    )
            )
            .on("keydown", e => {
                if (!this.searching && e.key == "Backspace" && this.value) {
                    this.value = null;

                    this.dispatchEvent(new Event("change"));

                    this.onFocus();
                }
            });
    }

    ready() {
        //Add a listener to the document click to blur our element.
        this.documentListener = (e) => this.onBlur(e);
        window.document.addEventListener("click", this.documentListener);
    }

    cleanup() {
        window.document.removeEventListener("click", this.documentListener);
    }

    onBlur(e) {
        //Only blur if we are editing and the target is not ourself or any of our children.
        if (this.searching) {
            if (e.target != this && !this.contains(e.target)) {
                this.searching = false;

                this.inputElement.blur();

                this.inputElement.textContent = null;
            }
        }
    }

    onFocus() {
        if (!this.searching && !this.value) {
            this.searching = true;

            this.inputElement.focus();

            this.inputElement.textContent = null;

            this.search(this.inputElement.textContent.trim());
        }
    }

    search(text) {
        var results = [];

        if (this.options) {
            results = results.concat(this.options);
        }

        if (text && text != "" && text != " ") {
            var regex = new RegExp(text, 'i');

            results = results.filter(result => {
                if (this.searchSelector) {
                    var values = this.searchSelector(result);

                    if (values) {
                        if (Array.isArray(values)) {
                            for (var i = 0; i < values.length; i++) {
                                if (values[i] && values[i].toString().match(regex)) {
                                    return true;
                                }
                            }
                        } else if (values.toString().match(regex)) {
                            return true;
                        }
                    }
                } else if (result && result.toString().match(regex)) {
                    return true;
                }

                return false;
            });
        }

        //Limit the results if needed
        if (this.maxResults != -1) {
            this.results = results.slice(0, this.maxResults);
        } else {
            this.results = results;
        }
    }
}

class Template extends IgniteTemplate {
    constructor(...children) {
        super("mt-search-select", children);
    }
}

IgniteHtml.register("mt-search-select", SearchSelect);

export {
    Template as SearchSelect
}