/**
 * ConversionGuideManager - Manages conversion guides for unsupported model formats
 * Displays instructions to convert various ML model formats to ONNX
 * Requirements: 7.1-7.4, 8.1-8.4, 9.1-9.4, 10.1-10.4, 11.1-11.4, 12.1-12.4, 13.1-13.4, 14.1-14.6
 */

class ConversionGuideManager {
  constructor() {
    this._errorContainer = document.getElementById('errorContainer');
  }

  // ─── Declarative Guide Configs ──────────────────────────────────────────

  static get GUIDE_CONFIGS() {
    return [
      {
        id: 'keras',
        extensions: ['.h5', '.keras'],
        icon: 'fas fa-brain',
        formatName: 'Keras/TensorFlow',
        pipCommand: 'pip install tf2onnx tensorflow',
        codeSnippet: `import tf2onnx
import tensorflow as tf

model = tf.keras.models.load_model("model.h5")

# Convert to ONNX
spec = (tf.TensorSpec(model.input_shape, tf.float32, name="input"),)
output_path = "model.onnx"

model_proto, _ = tf2onnx.convert.from_keras(
    model, input_signature=spec, output_path=output_path
)
print(f"Saved ONNX model to {output_path}")`,
        messages: {
          en: {
            title: 'Keras/TensorFlow file (.h5/.keras) is not directly supported',
            body: 'is a Keras/TensorFlow format. Please convert to <strong>.onnx</strong> before uploading.',
            installNote: 'Install:'
          },
          vi: {
            title: 'Tệp Keras/TensorFlow (.h5/.keras) không được hỗ trợ trực tiếp',
            body: 'là định dạng Keras/TensorFlow. Vui lòng convert sang <strong>.onnx</strong> trước khi upload.',
            installNote: 'Cài đặt:'
          },
          ja: {
            title: 'Keras/TensorFlow ファイル (.h5/.keras) は直接サポートされていません',
            body: 'は Keras/TensorFlow 形式です。アップロードする前に <strong>.onnx</strong> に変換してください。',
            installNote: 'インストール:'
          }
        }
      },
      {
        id: 'tensorflow-savedmodel',
        extensions: ['.pb'],
        icon: 'fas fa-project-diagram',
        formatName: 'TensorFlow SavedModel',
        pipCommand: 'pip install tf2onnx tensorflow',
        codeSnippet: `import tf2onnx
import tensorflow as tf

# Load SavedModel
graph_def, inputs, outputs = tf2onnx.tf_loader.from_saved_model(
    "saved_model_dir"
)

# Convert to ONNX
model_proto, _ = tf2onnx.convert.from_graph_def(
    graph_def,
    input_names=inputs,
    output_names=outputs,
    output_path="model.onnx"
)
print("Saved ONNX model to model.onnx")`,
        messages: {
          en: {
            title: 'TensorFlow SavedModel (.pb) is not directly supported',
            body: 'is a TensorFlow SavedModel format. Please convert to <strong>.onnx</strong> before uploading.',
            installNote: 'Install:'
          },
          vi: {
            title: 'Tệp TensorFlow SavedModel (.pb) không được hỗ trợ trực tiếp',
            body: 'là định dạng TensorFlow SavedModel. Vui lòng convert sang <strong>.onnx</strong> trước khi upload.',
            installNote: 'Cài đặt:'
          },
          ja: {
            title: 'TensorFlow SavedModel (.pb) は直接サポートされていません',
            body: 'は TensorFlow SavedModel 形式です。アップロードする前に <strong>.onnx</strong> に変換してください。',
            installNote: 'インストール:'
          }
        }
      },
      {
        id: 'coreml',
        extensions: ['.mlmodel'],
        icon: 'fas fa-apple-alt',
        formatName: 'CoreML',
        pipCommand: 'pip install coremltools onnxmltools',
        codeSnippet: `import coremltools
import onnxmltools

# Load CoreML model
coreml_model = coremltools.utils.load_spec("model.mlmodel")

# Convert to ONNX
onnx_model = onnxmltools.convert_coreml(coreml_model)
onnxmltools.utils.save_model(onnx_model, "model.onnx")
print("Saved ONNX model to model.onnx")`,
        messages: {
          en: {
            title: 'CoreML file (.mlmodel) is not directly supported',
            body: 'is a CoreML format. Please convert to <strong>.onnx</strong> before uploading.',
            installNote: 'Install:'
          },
          vi: {
            title: 'Tệp CoreML (.mlmodel) không được hỗ trợ trực tiếp',
            body: 'là định dạng CoreML. Vui lòng convert sang <strong>.onnx</strong> trước khi upload.',
            installNote: 'Cài đặt:'
          },
          ja: {
            title: 'CoreML ファイル (.mlmodel) は直接サポートされていません',
            body: 'は CoreML 形式です。アップロードする前に <strong>.onnx</strong> に変換してください。',
            installNote: 'インストール:'
          }
        }
      },
      {
        id: 'caffe',
        extensions: ['.caffemodel'],
        icon: 'fas fa-coffee',
        formatName: 'Caffe',
        pipCommand: 'pip install caffe2onnx',
        codeSnippet: `from caffe2onnx import convertToOnnx

# Convert Caffe model to ONNX
# Requires both .prototxt and .caffemodel files
graph = convertToOnnx("deploy.prototxt", "model.caffemodel")
graph.save("model.onnx")
print("Saved ONNX model to model.onnx")`,
        messages: {
          en: {
            title: 'Caffe file (.caffemodel) is not directly supported',
            body: 'is a Caffe format. Please convert to <strong>.onnx</strong> before uploading.',
            installNote: 'Install:'
          },
          vi: {
            title: 'Tệp Caffe (.caffemodel) không được hỗ trợ trực tiếp',
            body: 'là định dạng Caffe. Vui lòng convert sang <strong>.onnx</strong> trước khi upload.',
            installNote: 'Cài đặt:'
          },
          ja: {
            title: 'Caffe ファイル (.caffemodel) は直接サポートされていません',
            body: 'は Caffe 形式です。アップロードする前に <strong>.onnx</strong> に変換してください。',
            installNote: 'インストール:'
          }
        }
      },
      {
        id: 'darknet',
        extensions: ['.weights'],
        icon: 'fas fa-moon',
        formatName: 'Darknet/YOLO',
        pipCommand: 'pip install torch ultralytics',
        codeSnippet: `from ultralytics import YOLO

# Load Darknet/YOLO weights via Ultralytics
model = YOLO("yolov8n.pt")  # or load custom weights

# Export to ONNX (Darknet -> PyTorch -> ONNX pipeline)
model.export(format="onnx", imgsz=640)
print("Saved ONNX model to yolov8n.onnx")`,
        messages: {
          en: {
            title: 'Darknet/YOLO file (.weights) is not directly supported',
            body: 'is a Darknet/YOLO format. Please convert to <strong>.onnx</strong> via PyTorch before uploading.',
            installNote: 'Install:'
          },
          vi: {
            title: 'Tệp Darknet/YOLO (.weights) không được hỗ trợ trực tiếp',
            body: 'là định dạng Darknet/YOLO. Vui lòng convert sang <strong>.onnx</strong> qua PyTorch trước khi upload.',
            installNote: 'Cài đặt:'
          },
          ja: {
            title: 'Darknet/YOLO ファイル (.weights) は直接サポートされていません',
            body: 'は Darknet/YOLO 形式です。アップロードする前に PyTorch 経由で <strong>.onnx</strong> に変換してください。',
            installNote: 'インストール:'
          }
        }
      },
      {
        id: 'paddlepaddle',
        extensions: ['.pdmodel'],
        icon: 'fas fa-ship',
        formatName: 'PaddlePaddle',
        pipCommand: 'pip install paddle2onnx paddlepaddle',
        codeSnippet: `import paddle2onnx

# Convert PaddlePaddle model to ONNX
paddle2onnx.command.program2onnx(
    model_dir="paddle_model_dir",
    model_filename="model.pdmodel",
    params_filename="model.pdiparams",
    save_file="model.onnx",
    opset_version=13
)
print("Saved ONNX model to model.onnx")`,
        messages: {
          en: {
            title: 'PaddlePaddle file (.pdmodel) is not directly supported',
            body: 'is a PaddlePaddle format. Please convert to <strong>.onnx</strong> before uploading.',
            installNote: 'Install:'
          },
          vi: {
            title: 'Tệp PaddlePaddle (.pdmodel) không được hỗ trợ trực tiếp',
            body: 'là định dạng PaddlePaddle. Vui lòng convert sang <strong>.onnx</strong> trước khi upload.',
            installNote: 'Cài đặt:'
          },
          ja: {
            title: 'PaddlePaddle ファイル (.pdmodel) は直接サポートされていません',
            body: 'は PaddlePaddle 形式です。アップロードする前に <strong>.onnx</strong> に変換してください。',
            installNote: 'インストール:'
          }
        }
      },
      {
        id: 'mxnet',
        extensions: ['.params'],
        icon: 'fas fa-cubes',
        formatName: 'MXNet',
        pipCommand: 'pip install mxnet',
        codeSnippet: `import mxnet as mx
from mxnet.contrib import onnx as onnx_mxnet

# Convert MXNet model to ONNX
# Requires both symbol JSON and params files
converted_model = onnx_mxnet.export_model(
    sym="model-symbol.json",
    params="model-0000.params",
    input_shape=[(1, 3, 224, 224)],
    input_type="float32",
    onnx_file_path="model.onnx"
)
print("Saved ONNX model to model.onnx")`,
        messages: {
          en: {
            title: 'MXNet file (.params) is not directly supported',
            body: 'is an MXNet format. Please convert to <strong>.onnx</strong> before uploading.',
            installNote: 'Install:'
          },
          vi: {
            title: 'Tệp MXNet (.params) không được hỗ trợ trực tiếp',
            body: 'là định dạng MXNet. Vui lòng convert sang <strong>.onnx</strong> trước khi upload.',
            installNote: 'Cài đặt:'
          },
          ja: {
            title: 'MXNet ファイル (.params) は直接サポートされていません',
            body: 'は MXNet 形式です。アップロードする前に <strong>.onnx</strong> に変換してください。',
            installNote: 'インストール:'
          }
        }
      }
    ];
  }

  // ─── Public API ─────────────────────────────────────────────────────────

  /**
   * Check if a filename has a conversion-guide extension.
   * @param {string} fileName
   * @returns {boolean}
   */
  isConversionFormat(fileName) {
    if (!fileName || typeof fileName !== 'string') return false;
    const lower = fileName.toLowerCase();
    return ConversionGuideManager.GUIDE_CONFIGS.some(config =>
      config.extensions.some(ext => lower.endsWith(ext))
    );
  }

  /**
   * Display the conversion guide for the given file.
   * @param {string} fileName
   */
  showGuide(fileName) {
    if (!this._errorContainer) return;

    const lower = (fileName || '').toLowerCase();
    const config = ConversionGuideManager.GUIDE_CONFIGS.find(c =>
      c.extensions.some(ext => lower.endsWith(ext))
    );
    if (!config) return;

    const lang = this._getLanguage();
    const msgs = config.messages[lang] || config.messages['en'];
    const escapedName = this._escapeHtml(fileName);

    this._errorContainer.innerHTML = '';
    const div = document.createElement('div');
    div.className = 'alert alert-warning alert-dismissible fade show';
    div.setAttribute('role', 'alert');
    div.innerHTML = `
      <div class="d-flex align-items-start">
        <i class="fas fa-exchange-alt me-3 mt-1 fs-4 text-warning"></i>
        <div class="flex-grow-1">
          <h6 class="alert-heading mb-2">
            <i class="${config.icon} me-1"></i>
            ${msgs.title}
          </h6>
          <p class="mb-2">
            <strong>"${escapedName}"</strong> ${msgs.body}
          </p>
          <hr class="my-2">
          <p class="mb-1 fw-bold"><i class="fas fa-code me-1"></i> Convert ${config.formatName} → ONNX:</p>
          <pre class="bg-dark text-light p-2 rounded small mb-2" style="white-space:pre-wrap;"><code>${this._escapeHtml(config.codeSnippet)}</code></pre>
          <p class="mb-0 text-muted small">
            <i class="fas fa-info-circle me-1"></i>
            ${msgs.installNote} <code>${config.pipCommand}</code>
          </p>
        </div>
      </div>
      <button type="button" class="btn-close" aria-label="Close"
        onclick="this.closest('.alert').remove()"></button>
    `;
    this._errorContainer.appendChild(div);
  }

  // ─── Private ────────────────────────────────────────────────────────────

  /**
   * Get the current language from localStorage, default to 'en'.
   * @returns {string}
   */
  _getLanguage() {
    try {
      const lang = localStorage.getItem('onnx_explorer_help_lang');
      if (lang && ['en', 'vi', 'ja'].includes(lang)) return lang;
    } catch (_) {
      // localStorage not accessible
    }
    return 'en';
  }

  /**
   * Escape HTML using DOM text node method to prevent XSS.
   * @param {string} str
   * @returns {string}
   */
  _escapeHtml(str) {
    const div = document.createElement('div');
    div.appendChild(document.createTextNode(str || ''));
    return div.innerHTML;
  }
}

// Export as global for browser usage
window.ConversionGuideManager = ConversionGuideManager;