/* jshint esversion: 2024, module: true */

/**
 * Structured Editor for systemd-networkd configuration
 * @class StructuredEditor
 */
class StructuredEditor {
	constructor(container) {
		this.container = container;
		this.schema = null;
		this.currentFile = "";
	}

	/**
	 * Load configuration schema
	 * @param {Object} schema - Configuration schema from NetworkConfiguration.getSchema()
	 * @param {string} filename - File name
	 */
	loadSchema(schema, filename) {
		if (!this.container) {
			console.error("Structured editor container not found");
			return;
		}

		try {
			this.schema = schema;
			this.currentFile = filename;
			this.render();
		} catch (error) {
			console.error("Error loading schema:", error);
			this.showError(`Failed to load configuration schema: ${error.message}`);
		}
	}

	/**
	 * Render the structured editor
	 */
	render() {
		if (!this.container) {
			console.error("Cannot render: container is null");
			return;
		}

		if (!this.schema) {
			this.container.innerHTML =
				'<div class="error-message">No configuration schema loaded</div>';
			return;
		}

		try {
			this.container.innerHTML = this._createEditorHTML();
			this._attachEventListeners();
		} catch (error) {
			console.error("Error rendering structured editor:", error);
			this.showError(`Failed to render editor: ${error.message}`);
		}
	}

	/**
	 * Create editor HTML structure from schema
	 * @private
	 * @returns {string}
	 */
	_createEditorHTML() {
		return `
            <div class="structured-editor">
                <div class="editor-sections">
                    ${this._createSection("Match", this.schema.Match)}
                    ${this._createSection("Link", this.schema.Link)}
                    ${this._createSection("Network", this.schema.Network)}
                    ${this._createSection("DHCP", this.schema.DHCP)}
                    ${this._createArraySection("Address", this.schema.Address)}
                    ${this._createArraySection("Route", this.schema.Route)}
                </div>
            </div>
        `;
	}

	/**
	 * Create a regular section
	 * @private
	 * @param {string} sectionName - Section name
	 * @param {Object} sectionSchema - Section schema
	 * @returns {string}
	 */
	_createSection(sectionName, sectionSchema) {
		if (!this._hasSectionValues(sectionSchema)) {
			return "";
		}

		const fieldsHTML = Object.entries(sectionSchema)
			.map(([key, field]) => this._createFieldInput(key, field))
			.join("");

		return `
            <div class="config-section">
                <h4>[${sectionName}]</h4>
                <div class="config-table">
                    ${fieldsHTML}
                </div>
            </div>
        `;
	}

	/**
	 * Create an array section (Address, Route)
	 * @private
	 * @param {string} sectionName - Section name
	 * @param {Object} arraySchema - Array section schema
	 * @returns {string}
	 */
	_createArraySection(sectionName, arraySchema) {
		if (!arraySchema.items || arraySchema.items.length === 0) {
			return `
                <div class="config-section">
                    <h4>[${sectionName}]</h4>
                    <p class="no-items">No ${sectionName.toLowerCase()} sections</p>
                    <button class="button small" data-add-section="${sectionName}">
                        Add ${sectionName} Section
                    </button>
                </div>
            `;
		}

		const sectionsHTML = arraySchema.items
			.map((itemSchema, index) => {
				const fieldsHTML = Object.entries(itemSchema)
					.map(([key, field]) =>
						this._createFieldInput(key, field, sectionName, index),
					)
					.join("");

				return `
                <div class="config-section">
                    <h4>[${sectionName}] ${index > 0 ? `#${index + 1}` : ""}</h4>
                    <div class="config-table">
                        ${fieldsHTML}
                        <button class="button small warning remove-section"
                                data-section="${sectionName}" data-index="${index}">
                            Remove
                        </button>
                    </div>
                </div>
            `;
			})
			.join("");

		return `
            <div class="array-section">
                ${sectionsHTML}
                <div class="config-section">
                    <button class="button small" data-add-section="${sectionName}">
                        Add Another ${sectionName} Section
                    </button>
                </div>
            </div>
        `;
	}

	/**
	 * Create field input based on field schema
	 * @private
	 * @param {string} key - Field key
	 * @param {Object} field - Field schema
	 * @param {string} sectionName - Section name (for array sections)
	 * @param {number} index - Item index (for array sections)
	 * @returns {string}
	 */
	_createFieldInput(key, field, sectionName = null, index = null) {
		const dataAttributes = [];
		if (sectionName) {
			dataAttributes.push(`data-section="${sectionName}"`);
			dataAttributes.push(`data-index="${index}"`);
		}
		dataAttributes.push(`data-key="${key}"`);

		const inputId = sectionName ? `${sectionName}-${index}-${key}` : key;

		if (field.options?.enum) {
			// Create select for enum fields
			const optionsHTML = field.options.enum
				.map(
					(opt) =>
						`<option value="${opt}" ${opt === field.value ? "selected" : ""}>${opt || "(not set)"}</option>`,
				)
				.join("");

			return `
                <div class="config-row">
                    <label class="config-label" for="${inputId}" title="${field.description}">
                        <abbr title="${field.description}">${key}</abbr>:
                    </label>
                    <select id="${inputId}" class="config-select" ${dataAttributes.join(" ")}>
                        ${optionsHTML}
                    </select>
                </div>
            `;
		} else {
			// Create text input for other fields
			return `
                <div class="config-row">
                    <label class="config-label" for="${inputId}" title="${field.description}">
                        <abbr title="${field.description}">${key}</abbr>:
                    </label>
                    <input type="text"
                           id="${inputId}"
                           class="config-input"
                           ${dataAttributes.join(" ")}
                           value="${field.value || ""}"
                           placeholder="${field.description}">
                </div>
            `;
		}
	}

	/**
	 * Check if section has any values
	 * @private
	 * @param {Object} sectionSchema - Section schema
	 * @returns {boolean}
	 */
	_hasSectionValues(sectionSchema) {
		return Object.values(sectionSchema).some(
			(field) =>
				field.value !== null && field.value !== undefined && field.value !== "",
		);
	}

	/**
	 * Attach event listeners to the editor
	 * @private
	 */
	_attachEventListeners() {
		// Input changes
		this.container.querySelectorAll(".config-input").forEach((input) => {
			input.addEventListener("input", (e) => this._onInputChange(e));
		});

		// Select changes
		this.container.querySelectorAll(".config-select").forEach((select) => {
			select.addEventListener("change", (e) => this._onSelectChange(e));
		});

		// Add section buttons
		this.container.querySelectorAll("[data-add-section]").forEach((btn) => {
			btn.addEventListener("click", (e) => this._onAddSection(e));
		});

		// Remove section buttons
		this.container.querySelectorAll(".remove-section").forEach((btn) => {
			btn.addEventListener("click", (e) => this._onRemoveSection(e));
		});
	}

	/**
	 * Handle input changes
	 * @private
	 * @param {Event} event
	 */
	_onInputChange(event) {
		const input = event.target;
		this._updateFieldValue(input);
	}

	/**
	 * Handle select changes
	 * @private
	 * @param {Event} event
	 */
	_onSelectChange(event) {
		const select = event.target;
		this._updateFieldValue(select);
	}

	/**
	 * Update field value in schema
	 * @private
	 * @param {HTMLElement} element - Input or select element
	 */
	_updateFieldValue(element) {
		const section = element.dataset.section;
		const index = element.dataset.index
			? parseInt(element.dataset.index, 10)
			: null;
		const key = element.dataset.key;
		const value = element.value;

		if (!section) {
			// Regular section (Match, Link, Network, DHCP)
			if (this.schema[section]?.[key]) {
				this.schema[section][key].value = value || null;
			}
		} else if (
			index !== null &&
			this.schema[section] &&
			this.schema[section].items
		) {
			// Array section item
			if (this.schema[section].items[index]?.[key]) {
				this.schema[section].items[index][key].value = value || null;
			}
		}
	}

	/**
	 * Handle add section
	 * @private
	 * @param {Event} event
	 */
	_onAddSection(event) {
		const sectionName = event.target.dataset.addSection;
		this.emit("addSection", { section: sectionName });
	}

	/**
	 * Handle remove section
	 * @private
	 * @param {Event} event
	 */
	_onRemoveSection(event) {
		const section = event.target.dataset.section;
		const index = parseInt(event.target.dataset.index, 10);
		this.emit("removeSection", { section, index });
	}

	/**
	 * Show error message
	 * @param {string} message - Error message
	 */
	showError(message) {
		if (this.container) {
			this.container.innerHTML = `<div class="error-message">${message}</div>`;
		}
	}

	/**
	 * Emit custom event
	 * @param {string} eventName - Event name
	 * @param {Object} detail - Event detail
	 */
	emit(eventName, detail) {
		const event = new CustomEvent(eventName, { detail });
		this.container.dispatchEvent(event);
	}

	/**
	 * Add event listener
	 * @param {string} eventName - Event name
	 * @param {Function} callback - Event callback
	 */
	on(eventName, callback) {
		this.container.addEventListener(eventName, callback);
	}

	/**
	 * Get current schema
	 * @returns {Object|null}
	 */
	getSchema() {
		return this.schema;
	}
}

export { StructuredEditor };