// UnitForge Templates JavaScript
// Handles the templates browser functionality

class TemplatesBrowser {
  constructor() {
    this.templates = [];
    this.filteredTemplates = [];
    this.currentCategory = "all";
    this.currentTemplate = null;
    this.init();
  }

  init() {
    this.setupEventListeners();
    this.loadTemplates();
  }

  setupEventListeners() {
    // Search input
    const searchInput = document.getElementById("searchInput");
    if (searchInput) {
      searchInput.addEventListener(
        "keyup",
        this.debounce(this.filterTemplates.bind(this), 300),
      );
    }

    // Template form changes
    document.addEventListener("change", (e) => {
      if (
        e.target.matches(
          "#templateForm input, #templateForm select, #templateForm textarea",
        )
      ) {
        this.updatePreview();
      }
    });

    document.addEventListener("input", (e) => {
      if (e.target.matches("#templateForm input, #templateForm textarea")) {
        this.updatePreview();
      }
    });
  }

  async loadTemplates() {
    const loadingState = document.getElementById("loadingState");
    const templatesGrid = document.getElementById("templatesGrid");

    try {
      // Temporarily use static JSON file for testing
      const response = await fetch("/static/templates.json");
      this.templates = await response.json();
      this.filteredTemplates = [...this.templates];

      if (loadingState) loadingState.classList.add("d-none");
      if (templatesGrid) templatesGrid.classList.remove("d-none");

      this.renderTemplates();
      this.updateCategoryCounts();
    } catch (error) {
      if (loadingState) {
        loadingState.innerHTML = `
                    <div class="text-center py-5">
                        <i class="fas fa-exclamation-triangle fa-3x text-danger mb-3"></i>
                        <h4>Failed to load templates</h4>
                        <p class="text-muted">${error.message}</p>
                        <button class="btn btn-primary" onclick="location.reload()">Retry</button>
                    </div>
                `;
      }
      unitforge.showToast("Failed to load templates", "error");
    }
  }

  renderTemplates() {
    const grid = document.getElementById("templatesGrid");
    const noResults = document.getElementById("noResults");

    if (!grid) return;

    if (this.filteredTemplates.length === 0) {
      grid.classList.add("d-none");
      if (noResults) noResults.classList.remove("d-none");
      return;
    }

    if (noResults) noResults.classList.add("d-none");
    grid.classList.remove("d-none");

    grid.innerHTML = this.filteredTemplates
      .map((template) => this.createTemplateCard(template))
      .join("");
  }

  createTemplateCard(template) {
    const tags = template.tags
      .map((tag) => `<span class="template-tag">${this.escapeHtml(tag)}</span>`)
      .join("");

    const requiredParams = template.parameters.filter((p) => p.required).length;
    const totalParams = template.parameters.length;

    return `
            <div class="col-md-6 col-lg-4">
                <div class="card template-card border-0 shadow-sm" onclick="openTemplate('${template.name}')">
                    <div class="card-header">
                        <div class="d-flex justify-content-between align-items-start">
                            <div>
                                <h6 class="card-title mb-1">${this.escapeHtml(template.name)}</h6>
                                <small class="opacity-75">
                                    <i class="fas fa-${this.getUnitTypeIcon(template.unit_type)} me-1"></i>
                                    ${template.unit_type}
                                </small>
                            </div>
                            <span class="badge bg-light text-dark">${template.category}</span>
                        </div>
                    </div>
                    <div class="card-body">
                        <p class="card-text text-muted mb-3">${this.escapeHtml(template.description)}</p>

                        <div class="d-flex justify-content-between align-items-center mb-3">
                            <small class="text-muted">
                                <i class="fas fa-sliders-h me-1"></i>
                                ${requiredParams}/${totalParams} parameters
                            </small>
                        </div>

                        ${tags ? `<div class="template-tags">${tags}</div>` : ""}
                    </div>
                    <div class="card-footer bg-transparent border-0">
                        <div class="d-grid">
                            <button class="btn btn-primary btn-sm" onclick="event.stopPropagation(); openTemplate('${template.name}')">
                                <i class="fas fa-play me-2"></i>Use Template
                            </button>
                        </div>
                    </div>
                </div>
            </div>
        `;
  }

  getUnitTypeIcon(unitType) {
    const icons = {
      service: "play-circle",
      timer: "clock",
      socket: "plug",
      mount: "hdd",
      target: "bullseye",
      path: "folder",
    };
    return icons[unitType] || "file";
  }

  updateCategoryCounts() {
    const categories = {
      all: this.templates.length,
      "Web Services": 0,
      "Database Services": 0,
      "System Maintenance": 0,
      "Container Services": 0,
      "Network Services": 0,
    };

    this.templates.forEach((template) => {
      if (categories.hasOwnProperty(template.category)) {
        categories[template.category]++;
      }
    });

    // Update count badges
    const categoryMappings = {
      all: "count-all",
      "Web Services": "count-web",
      "Database Services": "count-database",
      "System Maintenance": "count-maintenance",
      "Container Services": "count-container",
      "Network Services": "count-network",
    };

    Object.keys(categories).forEach((category) => {
      const elementId = categoryMappings[category];
      if (elementId) {
        const countElement = document.getElementById(elementId);
        if (countElement) {
          countElement.textContent = categories[category];
        }
      }
    });
  }

  filterTemplates() {
    const searchTerm = document
      .getElementById("searchInput")
      .value.toLowerCase();

    this.filteredTemplates = this.templates.filter((template) => {
      const matchesSearch =
        !searchTerm ||
        template.name.toLowerCase().includes(searchTerm) ||
        template.description.toLowerCase().includes(searchTerm) ||
        template.tags.some((tag) => tag.toLowerCase().includes(searchTerm));

      const matchesCategory =
        this.currentCategory === "all" ||
        template.category === this.currentCategory;

      return matchesSearch && matchesCategory;
    });

    this.renderTemplates();
  }

  filterByCategory(category) {
    this.currentCategory = category;

    // Update active tab
    document.querySelectorAll("#categoryTabs .nav-link").forEach((tab) => {
      tab.classList.remove("active");
    });

    const tabMappings = {
      all: "tab-all",
      "Web Services": "tab-web",
      "Database Services": "tab-database",
      "System Maintenance": "tab-maintenance",
      "Container Services": "tab-container",
      "Network Services": "tab-network",
    };

    const activeTab = document.getElementById(tabMappings[category]);
    if (activeTab) {
      activeTab.classList.add("active");
    }

    this.filterTemplates();
  }

  clearSearch() {
    const searchInput = document.getElementById("searchInput");
    if (searchInput) {
      searchInput.value = "";
    }
    this.currentCategory = "all";

    // Reset active tab
    document.querySelectorAll("#categoryTabs .nav-link").forEach((tab) => {
      tab.classList.remove("active");
    });
    document.getElementById("tab-all").classList.add("active");

    this.filterTemplates();
  }

  async openTemplate(templateName) {
    try {
      this.currentTemplate = await unitforge.getTemplate(templateName);
      this.showTemplateModal();
    } catch (error) {
      unitforge.showToast(`Failed to load template: ${error.message}`, "error");
    }
  }

  showTemplateModal() {
    if (!this.currentTemplate) return;

    const modal = document.getElementById("templateModal");
    const title = document.getElementById("templateModalTitle");
    const info = document.getElementById("templateInfo");
    const parametersDiv = document.getElementById("templateParameters");
    const previewFilename = document.getElementById("previewFilename");

    // Update modal title
    if (title) {
      title.innerHTML = `
                <i class="fas fa-file-code me-2"></i>
                ${this.escapeHtml(this.currentTemplate.name)}
            `;
    }

    // Update template info
    if (info) {
      info.innerHTML = `
                <div class="row">
                    <div class="col-sm-3"><strong>Name:</strong></div>
                    <div class="col-sm-9">${this.escapeHtml(this.currentTemplate.name)}</div>
                </div>
                <div class="row">
                    <div class="col-sm-3"><strong>Type:</strong></div>
                    <div class="col-sm-9">
                        <i class="fas fa-${this.getUnitTypeIcon(this.currentTemplate.unit_type)} me-1"></i>
                        ${this.currentTemplate.unit_type}
                    </div>
                </div>
                <div class="row">
                    <div class="col-sm-3"><strong>Category:</strong></div>
                    <div class="col-sm-9">${this.escapeHtml(this.currentTemplate.category)}</div>
                </div>
                <div class="row">
                    <div class="col-sm-3"><strong>Description:</strong></div>
                    <div class="col-sm-9">${this.escapeHtml(this.currentTemplate.description)}</div>
                </div>
                ${
                  this.currentTemplate.tags.length > 0
                    ? `
                <div class="row">
                    <div class="col-sm-3"><strong>Tags:</strong></div>
                    <div class="col-sm-9">
                        ${this.currentTemplate.tags
                          .map(
                            (tag) =>
                              `<span class="badge bg-secondary me-1">${this.escapeHtml(tag)}</span>`,
                          )
                          .join("")}
                    </div>
                </div>
                `
                    : ""
                }
            `;
    }

    // Update filename
    if (previewFilename) {
      const defaultName = this.getDefaultName();
      previewFilename.textContent = `${defaultName}.${this.currentTemplate.unit_type}`;
    }

    // Generate parameters form
    if (parametersDiv) {
      parametersDiv.innerHTML = this.generateParametersForm();
    }

    // Show modal
    const bsModal = new bootstrap.Modal(modal);
    bsModal.show();

    // Update preview
    this.updatePreview();
  }

  generateParametersForm() {
    if (!this.currentTemplate || !this.currentTemplate.parameters) {
      return '<p class="text-muted">No parameters required for this template.</p>';
    }

    return this.currentTemplate.parameters
      .map((param) => {
        const isRequired = param.required;
        const fieldId = `param-${param.name}`;

        let inputHtml = "";

        switch (param.type) {
          case "boolean":
            inputHtml = `
                        <select class="form-select" id="${fieldId}" ${isRequired ? "required" : ""}>
                            <option value="true" ${param.default === true ? "selected" : ""}>True</option>
                            <option value="false" ${param.default === false ? "selected" : ""}>False</option>
                        </select>
                    `;
            break;

          case "choice":
            const options = param.choices
              .map(
                (choice) =>
                  `<option value="${choice}" ${param.default === choice ? "selected" : ""}>${choice}</option>`,
              )
              .join("");
            inputHtml = `
                        <select class="form-select" id="${fieldId}" ${isRequired ? "required" : ""}>
                            ${!isRequired ? '<option value="">-- Select --</option>' : ""}
                            ${options}
                        </select>
                    `;
            break;

          case "integer":
            inputHtml = `
                        <input type="number" class="form-control" id="${fieldId}"
                               value="${param.default || ""}"
                               placeholder="${param.example || ""}"
                               ${isRequired ? "required" : ""}>
                    `;
            break;

          default: // string, list
            inputHtml = `
                        <input type="text" class="form-control" id="${fieldId}"
                               value="${param.default || ""}"
                               placeholder="${param.example || ""}"
                               ${isRequired ? "required" : ""}>
                    `;
        }

        return `
                <div class="parameter-group">
                    <label for="${fieldId}" class="parameter-label">
                        ${this.escapeHtml(param.name)}
                        ${isRequired ? '<span class="parameter-required">*</span>' : '<span class="parameter-optional">(optional)</span>'}
                    </label>
                    <div class="parameter-description">${this.escapeHtml(param.description)}</div>
                    ${inputHtml}
                    ${param.example ? `<div class="form-text">Example: ${this.escapeHtml(param.example)}</div>` : ""}
                </div>
            `;
      })
      .join("");
  }

  getDefaultName() {
    const nameParam = this.currentTemplate.parameters.find(
      (p) => p.name === "name",
    );
    if (nameParam && nameParam.example) {
      return nameParam.example;
    }
    return this.currentTemplate.name.toLowerCase().replace(/[^a-z0-9]/g, "");
  }

  getFormParameters() {
    const parameters = {};

    if (!this.currentTemplate || !this.currentTemplate.parameters) {
      return parameters;
    }

    this.currentTemplate.parameters.forEach((param) => {
      const element = document.getElementById(`param-${param.name}`);
      if (element && element.value.trim()) {
        let value = element.value.trim();

        // Type conversion
        switch (param.type) {
          case "boolean":
            value = value === "true";
            break;
          case "integer":
            value = parseInt(value);
            if (isNaN(value)) value = param.default || 0;
            break;
          case "list":
            value = value
              .split(",")
              .map((v) => v.trim())
              .filter((v) => v);
            break;
        }

        parameters[param.name] = value;
      }
    });

    return parameters;
  }

  async updatePreview() {
    if (!this.currentTemplate) return;

    const preview = document.getElementById("templatePreview");
    const validation = document.getElementById("validationResults");

    if (!preview) return;

    const parameters = this.getFormParameters();

    // Check if required parameters are missing
    const missingRequired = this.currentTemplate.parameters
      .filter((p) => p.required && !parameters.hasOwnProperty(p.name))
      .map((p) => p.name);

    if (missingRequired.length > 0) {
      preview.innerHTML = `<code># Please fill in required parameters: ${missingRequired.join(", ")}</code>`;
      if (validation) validation.classList.add("d-none");
      return;
    }

    try {
      const result = await unitforge.generateFromTemplate(
        this.currentTemplate.name,
        parameters,
        `${parameters.name || "generated"}.${this.currentTemplate.unit_type}`,
      );

      preview.innerHTML = `<code>${this.escapeHtml(result.content)}</code>`;

      // Update filename
      const filenameElement = document.getElementById("previewFilename");
      if (filenameElement) {
        filenameElement.textContent = result.filename;
      }

      // Show validation results
      if (validation && result.validation) {
        validation.innerHTML = unitforge.formatValidationResults(
          result.validation,
        );
        validation.classList.remove("d-none");
      }
    } catch (error) {
      preview.innerHTML = `<code># Error generating preview: ${error.message}</code>`;
      if (validation) validation.classList.add("d-none");
    }
  }

  async validateTemplate() {
    const parameters = this.getFormParameters();
    const validation = document.getElementById("validationResults");

    if (!validation) return;

    validation.innerHTML = `
            <div class="alert alert-info">
                <i class="fas fa-spinner fa-spin me-2"></i>
                Validating template...
            </div>
        `;

    try {
      const result = await unitforge.generateFromTemplate(
        this.currentTemplate.name,
        parameters,
        `${parameters.name || "generated"}.${this.currentTemplate.unit_type}`,
      );

      validation.innerHTML = unitforge.formatValidationResults(
        result.validation,
      );

      if (result.validation.valid) {
        unitforge.showToast("Template validation passed!", "success");
      } else {
        unitforge.showToast(
          `Validation found ${result.validation.errors.length} error(s)`,
          "warning",
        );
      }
    } catch (error) {
      validation.innerHTML = `
                <div class="alert alert-danger">
                    <i class="fas fa-exclamation-circle me-2"></i>
                    Validation failed: ${error.message}
                </div>
            `;
      unitforge.showToast("Validation failed", "error");
    }
  }

  async generateAndDownload() {
    const generateBtn = document.getElementById("generateBtn");
    const originalText = generateBtn.innerHTML;

    generateBtn.innerHTML =
      '<i class="fas fa-spinner fa-spin me-2"></i>Generating...';
    generateBtn.disabled = true;

    try {
      const parameters = this.getFormParameters();
      const result = await unitforge.generateFromTemplate(
        this.currentTemplate.name,
        parameters,
        `${parameters.name || "generated"}.${this.currentTemplate.unit_type}`,
      );

      // Download the file
      unitforge.downloadTextFile(result.content, result.filename);
      unitforge.showToast(`Downloaded ${result.filename}`, "success");

      // Close modal
      const modal = bootstrap.Modal.getInstance(
        document.getElementById("templateModal"),
      );
      if (modal) {
        modal.hide();
      }
    } catch (error) {
      unitforge.showToast(`Generation failed: ${error.message}`, "error");
    } finally {
      generateBtn.innerHTML = originalText;
      generateBtn.disabled = false;
    }
  }

  openInEditor() {
    const parameters = this.getFormParameters();

    // Store template data in session storage for the editor
    sessionStorage.setItem(
      "templateData",
      JSON.stringify({
        template: this.currentTemplate.name,
        parameters: parameters,
      }),
    );

    // Open editor in new tab/window or navigate
    window.open("/editor", "_blank");
  }

  async copyPreviewToClipboard() {
    const preview = document.getElementById("templatePreview");
    if (preview) {
      const content = preview.textContent;
      await unitforge.copyToClipboard(content);
    }
  }

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

  debounce(func, wait) {
    let timeout;
    return function executedFunction(...args) {
      const later = () => {
        clearTimeout(timeout);
        func(...args);
      };
      clearTimeout(timeout);
      timeout = setTimeout(later, wait);
    };
  }
}

// Global functions for HTML onclick handlers
function filterByCategory(category) {
  templatesBrowser.filterByCategory(category);
}

function filterTemplates() {
  templatesBrowser.filterTemplates();
}

function clearSearch() {
  templatesBrowser.clearSearch();
}

function openTemplate(templateName) {
  templatesBrowser.openTemplate(templateName);
}

function validateTemplate() {
  templatesBrowser.validateTemplate();
}

function generateAndDownload() {
  templatesBrowser.generateAndDownload();
}

function openInEditor() {
  templatesBrowser.openInEditor();
}

function copyPreviewToClipboard() {
  templatesBrowser.copyPreviewToClipboard();
}

// Initialize the templates browser when DOM is ready
let templatesBrowser;

document.addEventListener("DOMContentLoaded", function () {
  templatesBrowser = new TemplatesBrowser();

  // Export for use in other modules
  window.TemplatesBrowser = TemplatesBrowser;
  window.templatesBrowser = templatesBrowser;
});