/**
 * API client for Recipe Manager backend
 */

import type { Recipe, RecipeDraft, Tag, ApiResponse, UrlImportResult } from '../types/recipe';

// Use relative URL - nginx will proxy to backend in production
// For local development (npm run dev), configure vite.config.ts proxy
const API_BASE_URL = '/api';

/**
 * Fetch recipes with optional filters
 */
export async function fetchRecipes(params?: {
  search?: string;
  offset?: number;
  limit?: number;
}): Promise<Recipe[]> {
  const url = new URL(`${API_BASE_URL}/recipes`, window.location.origin);
  
  if (params?.search) {
    url.searchParams.set('search', params.search);
  }
  if (params?.offset !== undefined) {
    url.searchParams.set('offset', params.offset.toString());
  }
  if (params?.limit !== undefined) {
    url.searchParams.set('limit', params.limit.toString());
  }

  const response = await fetch(url.toString());
  if (!response.ok) {
    throw new Error(`Failed to fetch recipes: ${response.statusText}`);
  }

  const result: ApiResponse<Recipe[]> = await response.json();
  if (!result.success || !result.data) {
    throw new Error(result.error || 'Failed to fetch recipes');
  }

  return result.data;
}

/**
 * Fetch a single recipe by ID
 */
export async function fetchRecipe(id: number): Promise<Recipe> {
  const response = await fetch(`${API_BASE_URL}/recipes/${id}`);
  if (!response.ok) {
    throw new Error(`Failed to fetch recipe: ${response.statusText}`);
  }

  const result: ApiResponse<Recipe> = await response.json();
  if (!result.success || !result.data) {
    throw new Error(result.error || 'Failed to fetch recipe');
  }

  return result.data;
}

/**
 * Create a new recipe
 */
export async function createRecipe(recipe: RecipeDraft): Promise<Recipe> {
  const response = await fetch(`${API_BASE_URL}/recipes`, {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
    },
    body: JSON.stringify(recipe),
  });

  if (!response.ok) {
    throw new Error(`Failed to create recipe: ${response.statusText}`);
  }

  const result: ApiResponse<Recipe> = await response.json();
  if (!result.success || !result.data) {
    throw new Error(result.error || 'Failed to create recipe');
  }

  return result.data;
}

/**
 * Update a recipe
 */
export async function updateRecipe(id: number, updates: Partial<Omit<Recipe, 'id' | 'created_at' | 'updated_at'>>): Promise<Recipe> {
  const response = await fetch(`${API_BASE_URL}/recipes/${id}`, {
    method: 'PUT',
    headers: {
      'Content-Type': 'application/json',
    },
    body: JSON.stringify(updates),
  });

  if (!response.ok) {
    throw new Error(`Failed to update recipe: ${response.statusText}`);
  }

  const result: ApiResponse<Recipe> = await response.json();
  if (!result.success || !result.data) {
    throw new Error(result.error || 'Failed to update recipe');
  }

  return result.data;
}

/**
 * Delete a recipe
 */
export async function deleteRecipe(id: number): Promise<void> {
  const response = await fetch(`${API_BASE_URL}/recipes/${id}`, {
    method: 'DELETE',
  });

  if (!response.ok) {
    throw new Error(`Failed to delete recipe: ${response.statusText}`);
  }

  const result: ApiResponse<{ deleted: number }> = await response.json();
  if (!result.success) {
    throw new Error(result.error || 'Failed to delete recipe');
  }
}

/**
 * Fetch all tags
 */
export async function fetchTags(): Promise<Tag[]> {
  const response = await fetch(`${API_BASE_URL}/tags`);
  if (!response.ok) {
    throw new Error(`Failed to fetch tags: ${response.statusText}`);
  }

  const result: ApiResponse<Tag[]> = await response.json();
  if (!result.success || !result.data) {
    throw new Error(result.error || 'Failed to fetch tags');
  }

  return result.data;
}

/**
 * Create a new tag
 */
export async function createTag(tag: Omit<Tag, 'id'>): Promise<Tag> {
  const response = await fetch(`${API_BASE_URL}/tags`, {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
    },
    body: JSON.stringify(tag),
  });

  if (!response.ok) {
    throw new Error(`Failed to create tag: ${response.statusText}`);
  }

  const result: ApiResponse<Tag> = await response.json();
  if (!result.success || !result.data) {
    throw new Error(result.error || 'Failed to create tag');
  }

  return result.data;
}

/**
 * Fetch tags for a specific recipe
 */
export async function fetchRecipeTags(recipeId: number): Promise<Tag[]> {
  const response = await fetch(`${API_BASE_URL}/tags/recipes/${recipeId}/tags`);
  if (!response.ok) {
    throw new Error(`Failed to fetch recipe tags: ${response.statusText}`);
  }

  const result: ApiResponse<Tag[]> = await response.json();
  if (!result.success || !result.data) {
    throw new Error(result.error || 'Failed to fetch recipe tags');
  }

  return result.data;
}

/**
 * Assign a tag to a recipe
 */
export async function assignTagToRecipe(recipeId: number, tagId: number): Promise<void> {
  const response = await fetch(`${API_BASE_URL}/tags/recipes/${recipeId}/tags`, {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
    },
    body: JSON.stringify({ tag_id: tagId }),
  });

  if (!response.ok) {
    throw new Error(`Failed to assign tag: ${response.statusText}`);
  }

  const result: ApiResponse<{ assigned: boolean }> = await response.json();
  if (!result.success) {
    throw new Error(result.error || 'Failed to assign tag');
  }
}

/**
 * Remove a tag from a recipe
 */
export async function removeTagFromRecipe(recipeId: number, tagId: number): Promise<void> {
  const response = await fetch(`${API_BASE_URL}/tags/recipes/${recipeId}/tags/${tagId}`, {
    method: 'DELETE',
  });

  if (!response.ok) {
    throw new Error(`Failed to remove tag: ${response.statusText}`);
  }

  const result: ApiResponse<{ removed: boolean }> = await response.json();
  if (!result.success) {
    throw new Error(result.error || 'Failed to remove tag');
  }
}

/**
 * Delete a tag
 */
export async function deleteTag(id: number): Promise<void> {
  const response = await fetch(`${API_BASE_URL}/tags/${id}`, {
    method: 'DELETE',
  });

  if (!response.ok) {
    throw new Error(`Failed to delete tag: ${response.statusText}`);
  }

  const result: ApiResponse<{ id: number }> = await response.json();
  if (!result.success) {
    throw new Error(result.error || 'Failed to delete tag');
  }
}


/**
 * Import recipe data from URL
 */
export async function importRecipeFromUrl(url: string): Promise<UrlImportResult> {
  const response = await fetch(`${API_BASE_URL}/import/url`, {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
    },
    body: JSON.stringify({ url }),
  });

  const result: ApiResponse<UrlImportResult> = await response.json();

  if (!response.ok) {
    const errorMessage = typeof result.error === 'string'
      ? result.error
      : JSON.stringify(result.error ?? 'Failed to import URL');
    throw new Error(errorMessage);
  }

  if (!result.success || !result.data) {
    throw new Error(result.error || 'Failed to import URL');
  }

  return result.data;
}