import { RecipeParser, ParsedRecipe } from './base.parser';

/**
 * Generisk parser för okända receptsidor
 * Försöker JSON-LD först, sedan vanlig HTML-parsing
 * Denna är mer permissiv än site-specifika parsers
 */
export class GenericRecipeParser extends RecipeParser {
  canHandle(url: string): boolean {
    // Denna parser hanterar alltid (är fallback)
    return true;
  }

  parse(html: string): ParsedRecipe {
    console.log('[GenericParser] Parsing recipe from unknown site...');

    // Försöka extrahera JSON-LD recipe data
    const jsonLdMatch = html.match(
      /<script[^>]*type="application\/ld\+json"[^>]*>([\s\S]*?)<\/script>/i
    );

    if (jsonLdMatch) {
      try {
        const jsonData = JSON.parse(jsonLdMatch[1]);
        const recipe =
          jsonData['@type'] === 'Recipe'
            ? jsonData
            : jsonData['@graph']?.find((item: any) => item['@type'] === 'Recipe');

        if (recipe) {
          console.log('[GenericParser] ✓ JSON-LD data found');
          return this.extractFromJsonLd(recipe);
        }
      } catch (err) {
        console.log('[GenericParser] JSON-LD parsing failed');
      }
    }

    console.log('[GenericParser] No JSON-LD found, using HTML parsing');
    return this.parseFromHtml(html);
  }

  private extractFromJsonLd(recipe: any): ParsedRecipe {
    const name = recipe.name || '';

    const ingredients: Array<{ quantity: number; unit: string; name: string }> = [];
    if (recipe.recipeIngredient && Array.isArray(recipe.recipeIngredient)) {
      for (const ing of recipe.recipeIngredient) {
        const parsed = this.parseIngredientLine(ing);
        if (parsed) {
          ingredients.push(parsed);
        }
      }
    }

    let instructions = '';
    if (recipe.recipeInstructions) {
      if (typeof recipe.recipeInstructions === 'string') {
        instructions = recipe.recipeInstructions;
      } else if (Array.isArray(recipe.recipeInstructions)) {
        instructions = recipe.recipeInstructions
          .map((step: any) => {
            if (typeof step === 'string') return step;
            if (step.text) return step.text;
            return '';
          })
          .filter((s: string) => s)
          .join('\n\n');
      }
    }

    return {
      name,
      ingredients,
      instructions,
    };
  }

  private parseFromHtml(html: string): ParsedRecipe {
    // Försöka hitta titel
    let name = '';
    
    // Prova olika selector-mönster
    let titleMatch =
      html.match(/<h1[^>]*>([^<]+)<\/h1>/i) ||
      html.match(/<meta\s+property="og:title"\s+content="([^"]+)"/i) ||
      html.match(/<title>([^<]+)<\/title>/i);

    if (titleMatch) {
      name = titleMatch[1].trim();
    }

    // Försöka extrahera ingredienser från vanliga strukturer
    const ingredients: Array<{ quantity: number; unit: string; name: string }> = [];
    
    // Testa olika ingredient-selectors
    const ingredientPatterns = [
      /<li[^>]*>(.*?)<\/li>/gi,
      /<div[^>]*class="ingredient"[^>]*>(.*?)<\/div>/gi,
      /<p[^>]*class="ingredient"[^>]*>(.*?)<\/p>/gi,
    ];

    for (const pattern of ingredientPatterns) {
      let match;
      while ((match = pattern.exec(html)) !== null) {
        const parsed = this.parseIngredientLine(match[1]);
        if (parsed && parsed.name.length > 2) {
          // Undvik mycket korta ingredienser (troligen brus)
          ingredients.push(parsed);
        }
      }
      if (ingredients.length > 0) break; // Om vi hittat några, använd dessa
    }

    // Försöka hitta instruktioner
    let instructions = '';
    const instructionsPatterns = [
      /<(?:div|section)[^>]*class="[^"]*(?:instruction|method|step)[^"]*"[^>]*>(.*?)<\/(?:div|section)>/is,
      /<ol[^>]*>(.*?)<\/ol>/i,
    ];

    for (const pattern of instructionsPatterns) {
      const match = html.match(pattern);
      if (match) {
        instructions = match[1].replace(/<[^>]+>/g, '').trim();
        if (instructions.length > 10) break;
      }
    }

    return {
      name,
      ingredients,
      instructions,
    };
  }
}