export default {
  id: 'terminal',
  title: 'Terminal',
  render: function (container, api) {
    var commandHistory = [];
    var historyIndex = -1;
    var outputLines = [];
    var bus = api.bus;

    // ── DOM Structure ──────────────────────────────────────
    container.style.cssText = 'height:100%;width:100%;background:#0a0b0d;color:#cfd3d8;display:flex;flex-direction:column;font-family:ui-monospace,"JetBrains Mono",Menlo,monospace;overflow:hidden;cursor:text;';

    var outputEl = document.createElement('div');
    outputEl.style.cssText = 'flex:1;overflow-y:auto;padding:12px;font-size:14px;line-height:1.5;white-space:pre-wrap;word-break:break-word;';

    var inputRow = document.createElement('div');
    inputRow.style.cssText = 'display:flex;align-items:center;padding:4px 12px 12px;';

    var promptEl = document.createElement('span');
    promptEl.style.cssText = 'color:#d4a24c;font-size:14px;line-height:1.5;white-space:pre;user-select:none;';
    promptEl.textContent = 'tarnished@meridian:~$ ';

    var inputEl = document.createElement('input');
    inputEl.style.cssText = 'flex:1;background:transparent;border:none;color:inherit;outline:none;font-family:inherit;font-size:14px;line-height:1.5;cursor:text;';
    inputEl.setAttribute('type', 'text');
    inputEl.setAttribute('autocomplete', 'off');
    inputEl.setAttribute('autocorrect', 'off');
    inputEl.setAttribute('autocapitalize', 'off');
    inputEl.setAttribute('spellcheck', 'false');

    inputRow.appendChild(promptEl);
    inputRow.appendChild(inputEl);
    container.appendChild(outputEl);
    container.appendChild(inputRow);

    // ── Helpers ────────────────────────────────────────────
    function appendLine(text, color) {
      var line = document.createElement('div');
      line.style.cssText = 'font-size:14px;line-height:1.5;';
      line.style.color = color || '#cfd3d8';
      line.textContent = text;
      outputEl.appendChild(line);
      outputLines.push(line);
      outputEl.scrollTop = outputEl.scrollHeight;
    }

    function printBanner() {
      appendLine('Meridian Shell 1.0 (kernel 4.19-browser)');
      appendLine("Type 'help' to begin. Try 'praise_the_sun' if you know what you're doing.");
      appendLine('');
    }

    // ── Real Commands ──────────────────────────────────────
    function cmdHelp() {
      appendLine('Available commands:');
      appendLine('  help          Show this help message');
      appendLine('  ls            List directory contents');
      appendLine('  whoami        Show current user');
      appendLine('  date          Show current date');
      appendLine('  uname         Show system info');
      appendLine('  echo <text>   Print text');
      appendLine('  clear         Clear terminal output');
      appendLine('  cat <file>    Read a file');
      appendLine('  history       Show command history');
      appendLine('  achievements  Show unlocked achievements');
      appendLine('  exit          Close terminal');
      appendLine('');
      appendLine("Try 'praise_the_sun' if you know what you're doing.");
    }

    function cmdLs() {
      appendLine('Documents  Downloads  Music  Pictures  save_files.dat');
    }

    function cmdWhoami() {
      var user = api.state.get('user');
      appendLine(user ? user.name : 'tarnished');
    }

    function cmdDate() {
      appendLine(new Date().toString());
    }

    function cmdUname() {
      appendLine('Meridian 1.0 (browser-kernel)');
    }

    function cmdEcho(args) {
      if (args.length === 0) return;
      appendLine(args.join(' '));
    }

    function cmdClear() {
      outputEl.innerHTML = '';
      outputLines = [];
    }

    function cmdCat(file) {
      if (!file) {
        appendLine('cat: missing operand', '#c85d5d');
        return;
      }
      if (file === 'save_files.dat') {
        appendLine("Ah, you want to read your save file? Not today. Some mysteries are better left unsolved.", '#d4a24c');
        return;
      }
      appendLine('cat: ' + file + ': No such file or directory', '#c85d5d');
    }

    function cmdHistory() {
      if (commandHistory.length === 0) {
        appendLine('No commands in history.');
        return;
      }
      commandHistory.forEach(function (cmd, i) {
        appendLine('  ' + String(i + 1).padStart(4) + '  ' + cmd);
      });
    }

    function cmdAchievements() {
      var achievements = api.state.get('achievements');
      if (!achievements || achievements.length === 0) {
        appendLine('No achievements unlocked yet.');
        return;
      }
      appendLine('Unlocked achievements (' + achievements.length + '):');
      achievements.forEach(function (a) {
        appendLine('  [x] ' + a);
      });
    }

    function cmdExit() {
      api.close();
    }

    // ── Easter Eggs ────────────────────────────────────────
    var easterEggs = {
      'praise_the_sun': {
        msg: 'A grace of Gold is bestowed upon you.\nMay it guide you in the dark times ahead.',
        slug: 'er_grace'
      },
      'tarnished': {
        msg: 'Well then, tarnished. Seek strength. For that is your duty.',
        slug: 'er_tarnished'
      },
      'try finger, but hole': {
        msg: 'Message left by a fellow traveler. Rating: brilliant. Rating: inappropriate.',
        slug: 'er_bong_hits'
      },
      'dropshot': {
        msg: 'Hitmarker. Clean drop.',
        slug: 'er_dropshot'
      },
      '360_noscope': {
        msg: '     |\n    /|\\\n-------\n    |/\nmontage material acquired.',
        slug: 'er_360noscope'
      },
      'mw2': {
        msg: 'A true classic. Soap would be proud.',
        slug: 'er_mw2'
      },
      'siuuu': {
        msg: 'SIUUUUU! The keeper had no chance.',
        slug: 'er_siuuu'
      },
      'golazo': {
        msg: 'Top bins. What a strike. What a moment.',
        slug: 'er_golazo'
      },
      'wonderkid': {
        msg: 'Regen detected. Potential: 5 stars.',
        slug: 'er_wonderkid'
      },
      'konami': {
        msg: 'Cheat mode enabled. (it does nothing. you are already a legend.)',
        slug: 'er_konami'
      },
      'matrix': {
        msg: null,
        slug: 'er_matrix'
      },
      'sudo rm -rf /': {
        msg: 'nice try, tarnished. root is a state of mind.',
        slug: 'er_sudo_rm_rf'
      }
    };

    function triggerEasterEgg(cmdName, egg) {
      bus.emit('term:cmd', { cmd: cmdName });
      bus.emit('easter:found', { id: egg.slug });

      if (cmdName === 'matrix') {
        appendLine('Entering the matrix...', '#d4a24c');
        var mlines = [];
        for (var mi = 0; mi < 8; mi++) {
          var row = '';
          for (var mj = 0; mj < 40; mj++) {
            row += Math.random() < 0.5 ? '0' : '1';
          }
          mlines.push(row);
        }
        var mlIdx = 0;
        function typeNext() {
          if (mlIdx < mlines.length) {
            appendLine(mlines[mlIdx], '#41c35a');
            mlIdx++;
            setTimeout(typeNext, 30);
          }
        }
        setTimeout(typeNext, 30);
        return;
      }

      if (cmdName === 'sudo rm -rf /') {
        appendLine('...', '#d4a24c');
        setTimeout(function () {
          outputEl.removeChild(outputEl.lastChild);
          appendLine('nice try, tarnished. root is a state of mind.', '#d4a24c');
        }, 900);
        return;
      }

      if (egg.msg && egg.msg.indexOf('\n') !== -1) {
        egg.msg.split('\n').forEach(function (ln) {
          appendLine(ln, '#d4a24c');
        });
      } else if (egg.msg) {
        appendLine(egg.msg, '#d4a24c');
      }
    }

    // ── Command Processing ─────────────────────────────────
    function emitRealCmd(cmd) {
      bus.emit('term:cmd', { cmd: cmd });
    }

    function processInput(raw) {
      var trimmed = raw.trim();
      if (!trimmed) return;

      commandHistory.push(trimmed);
      if (commandHistory.length > 50) {
        commandHistory.shift();
      }
      historyIndex = commandHistory.length;

      appendLine(promptEl.textContent + trimmed, '#d4a24c');

      if (easterEggs[trimmed]) {
        triggerEasterEgg(trimmed, easterEggs[trimmed]);
        return;
      }

      var parts = trimmed.split(/\s+/);
      var cmd = parts[0].toLowerCase();

      if (easterEggs[cmd]) {
        triggerEasterEgg(cmd, easterEggs[cmd]);
        return;
      }

      emitRealCmd(cmd);
      switch (cmd) {
        case 'help':        cmdHelp(); break;
        case 'ls':          cmdLs(); break;
        case 'whoami':      cmdWhoami(); break;
        case 'date':        cmdDate(); break;
        case 'uname':       cmdUname(); break;
        case 'echo':        cmdEcho(parts.slice(1)); break;
        case 'clear':       cmdClear(); break;
        case 'cat':         cmdCat(parts[1]); break;
        case 'history':     cmdHistory(); break;
        case 'achievements': cmdAchievements(); break;
        case 'exit':        cmdExit(); break;
        default:
          appendLine('Command not found: ' + cmd, '#c85d5d');
      }
    }

    // ── Keyboard Handling ──────────────────────────────────
    inputEl.addEventListener('keydown', function (e) {
      if (e.key === 'Enter') {
        processInput(inputEl.value);
        inputEl.value = '';
        historyIndex = commandHistory.length;
      } else if (e.key === 'ArrowUp') {
        e.preventDefault();
        if (historyIndex > 0) {
          historyIndex--;
          inputEl.value = commandHistory[historyIndex];
        }
      } else if (e.key === 'ArrowDown') {
        e.preventDefault();
        if (historyIndex < commandHistory.length - 1) {
          historyIndex++;
          inputEl.value = commandHistory[historyIndex];
        } else {
          historyIndex = commandHistory.length;
          inputEl.value = '';
        }
      } else if (e.ctrlKey && e.key.toLowerCase() === 'l') {
        e.preventDefault();
        cmdClear();
      }
    });

    // ── Click to Focus ─────────────────────────────────────
    container.addEventListener('click', function () {
      inputEl.focus();
    });

    // ── Initial Banner ─────────────────────────────────────
    printBanner();
    inputEl.focus();
  }
};