import DropZone from "./DropZone.js";
import KanbanAPI from "../api/KanbanAPI.js";
import Dialog from "./Dialog.js";
import Priority from "./Priority.js";
import Complexity from "./Complexity.js";

export default class Item {
    constructor(data) {
        this.data = { ...data };
        this.content = data.content || "";

        const bottomDropZone = DropZone.createDropZone();

        this.elements = {};
        this.elements.root = Item.createRoot();
        this.elements.input =
            this.elements.root.querySelector(
                ".kanban__item-input"
            );

        this.elements.root.dataset.id = String(data.id);
        this.elements.root.className =
            `kanban__item color-${data.color || "yellow"}`;

        this.elements.root.querySelector(
            ".kanban__number"
        ).textContent = String(data.id);

        this.elements.root.querySelector(
            ".kanban__assign"
        ).textContent = data.assign || "";

        this.elements.input.textContent = this.content;

        this.renderDescription(data.description);
        this.renderTags(data.tags);
        this.renderDates(data);
        this.renderTaskInformation(data);
        this.renderComplexity(data.complexity);
        this.renderPriority(data.priority);

        this.elements.root.appendChild(bottomDropZone);

        this.elements.input.addEventListener("blur", () => {
            this.saveInlineContent();
        });

        this.elements.root.addEventListener("dblclick", event => {
            if (event.target.closest(".kanban__dropzone")) {
                return;
            }

            Dialog.modify_task(data.id);
        });

        this.elements.root.addEventListener("dragstart", event => {
            event.dataTransfer.effectAllowed = "move";
            event.dataTransfer.setData(
                "text/plain",
                String(data.id)
            );

            this.elements.root.classList.add(
                "kanban__item--dragging"
            );
        });

        this.elements.root.addEventListener("dragend", () => {
            this.elements.root.classList.remove(
                "kanban__item--dragging"
            );
        });

        this.elements.input.addEventListener("drop", event => {
            event.preventDefault();
        });
    }

    async saveInlineContent() {
        const newContent =
            this.elements.input.textContent.trim();

        if (newContent === this.content) {
            return;
        }

        if (newContent === "") {
            this.elements.input.textContent = this.content;
            return;
        }

        try {
            await KanbanAPI.updateItem(this.data.id, {
                content: newContent
            });

            this.content = newContent;
            this.data.content = newContent;
        } catch (error) {
            console.error(error);
            this.elements.input.textContent = this.content;
        }
    }

    renderDescription(description) {
        if (!description) {
            return;
        }

        const indicator = document.createElement("span");
        const icon = document.createElement("i");

        icon.textContent = "✍";
        icon.title = description;

        indicator.appendChild(icon);
        this.elements.root.appendChild(indicator);
    }

    renderTags(tags) {
        if (!tags) {
            return;
        }

        const tagElement = document.createElement("span");
        tagElement.className = "kanban__tags";
        tagElement.textContent = tags;

        this.elements.root.appendChild(tagElement);
    }

    renderDates(data) {
        if (Item.isValidDate(data.start)) {
            const startElement = document.createElement("span");
            startElement.className = "date";
            startElement.textContent =
                `| Start: ${Item.formatDate(data.start)}`;

            this.elements.root.appendChild(startElement);
        }

        if (Item.isValidDate(data.due)) {
            const dueElement = document.createElement("span");
            dueElement.className = "datetime";
            dueElement.textContent =
                `| Due: ${new Date(data.due).toLocaleString()}`;

            this.elements.root.appendChild(dueElement);
        }
    }

    renderTaskInformation(data) {
        const information = [];

        if (data.estimate !== null && data.estimate !== undefined) {
            information.push(`| Estimate: ${data.estimate}h`);
        }

        if (
            data.timeSpent !== null &&
            data.timeSpent !== undefined
        ) {
            information.push(`| Spent: ${data.timeSpent}h`);
        }

        if (information.length === 0) {
            return;
        }

        const informationElement =
            document.createElement("span");

        informationElement.className =
            "kanban__task-information";

        informationElement.textContent =
            information.join(" | ");

        this.elements.root.appendChild(informationElement);
    }

    renderPriority(priority) {
        const priorityElement =
            document.createElement("span");

        priorityElement.className = "kanban__priority";
        priorityElement.textContent =
            Priority.get_priority(Number(priority));

        this.elements.root.appendChild(priorityElement);
    }

    renderComplexity(level) {
        const complexityElement =
            document.createElement("div");

        complexityElement.className = "kanban__complexity";
        complexityElement.textContent =
            Complexity.get_complexity(Number(level));

        this.elements.root.appendChild(complexityElement);
    }

    static isValidDate(value) {
        if (!value) {
            return false;
        }

        const date = new Date(value);

        return !Number.isNaN(date.getTime());
    }

    static formatDate(value) {
        const [year, month, day] = value.split("-");

        if (!year || !month || !day) {
            return value;
        }

        return new Date(
            Number(year),
            Number(month) - 1,
            Number(day)
        ).toLocaleDateString();
    }

    static createRoot() {
        const template = document.createElement("template");

        template.innerHTML = `
            <div class="kanban__item" draggable="true">
                <div class="kanban__number"></div>
                <div class="kanban__assign"></div>
                <div class="kanban__item-input"
                     contenteditable="true"></div>
            </div>
        `;

        return template.content.firstElementChild;
    }
}