class QLConsole {
    constructor(username, project) {
        this.username = username;
        this.project = project;
        this.history = [];
        this.historyIndex = -1;
        this.currentCommand = '';
        this.isProcessing = false;
        this.init();
    }

    init() {
        this.bindEvents();
        this.printWelcome();
        this.setupHistory();
    }

    bindEvents() {
        const input = document.getElementById('consoleInput');
        const output = document.getElementById('consoleOutput');

        if (!input || !output) return;

        // Obsługa klawisza Enter
        input.addEventListener('keydown', (e) => {
            if (e.key === 'Enter') {
                e.preventDefault();
                this.executeCommand(input.value.trim());
                input.value = '';
                this.historyIndex = -1;
            }

            // Strzałki dla historii
            else if (e.key === 'ArrowUp') {
                e.preventDefault();
                this.navigateHistory(-1);
            }
            else if (e.key === 'ArrowDown') {
                e.preventDefault();
                this.navigateHistory(1);
            }

            // Tab dla autouzupełniania
            else if (e.key === 'Tab') {
                e.preventDefault();
                this.autoComplete(input);
            }
        });

        // Obsługa przycisków konsoli
        document.getElementById('clearConsoleBtn')?.addEventListener('click', () => this.clearConsole());
        document.getElementById('helpConsoleBtn')?.addEventListener('click', () => this.showHelp());

        // Fokus na input przy kliknięciu w konsolę
        output.addEventListener('click', () => {
            input.focus();
        });

        // Auto-focus przy załadowaniu
        setTimeout(() => input.focus(), 100);
    }

    async executeCommand(command) {
        if (!command) return;

        // Dodaj do historii
        if (command !== this.history[this.history.length - 1]) {
            this.history.push(command);
            if (this.history.length > 50) {
                this.history.shift();
            }
        }

        // Wyświetl komendę
        this.printCommand(command);

        // Ustaw flagę przetwarzania
        this.isProcessing = true;
        this.showLoading();

        try {
            const response = await fetch(`/editor/${this.username}/${this.project}/console`, {
                method: 'POST',
                headers: {
                    'Content-Type': 'application/json',
                },
                body: JSON.stringify({
                    command: command
                })
            });

            const data = await response.json();

            if (response.ok) {
                if (data.output === 'CLEAR_CONSOLE') {
                    this.clearConsole();
                    this.printWelcome();
                } else {
                    this.printResponse(data.output);
                }
            } else {
                this.printError(data.output || 'Błąd wykonania komendy');
            }
        } catch (error) {
            this.printError(`Błąd sieciowy: ${error.message}`);
        } finally {
            this.isProcessing = false;
            this.hideLoading();
            this.scrollToBottom();
        }
    }

    printWelcome() {
        const welcome = `
========================================
QL Console - Terminal systemowy
Projekt: ${this.project}
Użytkownik: ${this.username}
Wpisz 'help' aby zobaczyć dostępne komendy
========================================
        `.trim();

        this.printInfo(welcome);
    }

    printCommand(command) {
        const output = document.getElementById('consoleOutput');
        const line = document.createElement('div');
        line.className = 'console-line';
        line.innerHTML = `
            <span class="console-prompt">$</span>
            <span class="console-command">${this.escapeHtml(command)}</span>
        `;
        output.appendChild(line);
    }

    printResponse(response) {
        const output = document.getElementById('consoleOutput');
        const lines = response.split('\n');

        lines.forEach(line => {
            const div = document.createElement('div');
            div.className = 'console-line';

            if (line.includes('Błąd:') || line.includes('Nie można')) {
                div.className += ' console-error';
            } else if (line.includes('Utworzono') || line.includes('Zmieniono') || line.includes('Usunięto')) {
                div.className += ' console-success';
            } else if (line.includes('Ścieżka:') || line.includes('Katalog:')) {
                div.className += ' console-path';
            } else {
                div.className += ' console-info';
            }

            div.textContent = line;
            output.appendChild(div);
        });

        this.scrollToBottom();
    }

    printError(error) {
        const output = document.getElementById('consoleOutput');
        const line = document.createElement('div');
        line.className = 'console-line console-error';
        line.textContent = `❌ ${error}`;
        output.appendChild(line);
        this.scrollToBottom();
    }

    printInfo(info) {
        const output = document.getElementById('consoleOutput');
        const line = document.createElement('div');
        line.className = 'console-line console-info';
        line.textContent = info;
        output.appendChild(line);
        this.scrollToBottom();
    }

    clearConsole() {
        const output = document.getElementById('consoleOutput');
        output.innerHTML = '';
    }

    showHelp() {
        const help = `Dostępne komendy:
• help      - wyświetla tę pomoc
• ls        - lista plików i folderów
• cd [dir]  - zmień katalog
• pwd       - pokaż aktualny katalog
• mkdir [dir] - utwórz nowy katalog
• touch [file] - utwórz nowy plik
• cat [file] - wyświetl zawartość pliku
• rm [file]  - usuń plik
• clear     - wyczyść konsolę`;

        this.printResponse(help);
    }

    navigateHistory(direction) {
        if (this.history.length === 0) return;

        const input = document.getElementById('consoleInput');

        if (direction === -1) { // Strzałka w górę
            if (this.historyIndex < this.history.length - 1) {
                if (this.historyIndex === -1) {
                    this.currentCommand = input.value;
                }
                this.historyIndex++;
            }
        } else { // Strzałka w dół
            if (this.historyIndex > 0) {
                this.historyIndex--;
            } else if (this.historyIndex === 0) {
                this.historyIndex = -1;
                input.value = this.currentCommand;
                return;
            }
        }

        if (this.historyIndex >= 0) {
            input.value = this.history[this.history.length - 1 - this.historyIndex];
        }

        // Przesuń kursor na koniec
        input.selectionStart = input.selectionEnd = input.value.length;
    }

    autoComplete(input) {
        const current = input.value;
        // Proste autouzupełnianie - można rozbudować
        const commands = ['help', 'ls', 'cd', 'pwd', 'mkdir', 'touch', 'cat', 'rm', 'clear'];

        const matching = commands.filter(cmd => cmd.startsWith(current));
        if (matching.length === 1) {
            input.value = matching[0];
        } else if (matching.length > 1) {
            this.printInfo(`Możliwe komendy: ${matching.join(', ')}`);
        }
    }

    showLoading() {
        const output = document.getElementById('consoleOutput');
        const loader = document.createElement('div');
        loader.id = 'consoleLoading';
        loader.className = 'console-loading';
        output.appendChild(loader);
    }

    hideLoading() {
        const loader = document.getElementById('consoleLoading');
        if (loader) {
            loader.remove();
        }
    }

    scrollToBottom() {
        const output = document.getElementById('consoleOutput');
        output.scrollTop = output.scrollHeight;
    }

    escapeHtml(text) {
        const div = document.createElement('div');
        div.textContent = text;
        return div.innerHTML;
    }

    setupHistory() {
        // Załaduj historię z localStorage
        const savedHistory = localStorage.getItem(`console_history_${this.username}_${this.project}`);
        if (savedHistory) {
            this.history = JSON.parse(savedHistory);
        }

        // Zapisz historię przy wyjściu
        window.addEventListener('beforeunload', () => {
            localStorage.setItem(`console_history_${this.username}_${this.project}`,
                               JSON.stringify(this.history.slice(-20)));
        });
    }
}

// Inicjalizacja konsoli
document.addEventListener('DOMContentLoaded', () => {
    const username = document.body.dataset.username;
    const project = document.body.dataset.project;

    if (username && project) {
        window.qlconsole = new QLConsole(username, project);
    }
});

// Globalne funkcje dostępne z konsoli
window.Console = {
    clear: function() {
        if (window.qlconsole) {
            window.qlconsole.clearConsole();
            window.qlconsole.printWelcome();
        }
    },

    run: function(command) {
        if (window.qlconsole) {
            window.qlconsole.executeCommand(command);
        }
    },

    help: function() {
        if (window.qlconsole) {
            window.qlconsole.showHelp();
        }
    }
};