import config from '../config';
import * as Errors from './Errors';

class Api {
  constructor() {
  }

  baseUrl() { return config.baseApiUrl; }

  url(path) {
    return this.baseUrl() + path;
  }

  checkStatus(response) {
    if (response.status == 204) {
      return null;
    } else if (response.ok) {
      return response.json();
    } else if (response.status === 404) {
      throw new Errors.ApiNotFoundError(response.statusText, response);
    } else if (response.status === 422) {
      return response.json().then(json => { throw new Errors.ApiValidationError(null, response, json) }, jsonErr => { throw new Errors.ApiValidationError(null, response, null) });
    } else {
      throw new Errors.ApiServerError(response.statusText || "Unknown Server Error", response);
    }
  }

  parseJSON(response) {
    return response.json();
  }

  performRequest(url, method, params = {}) {
    const hasBody = Object.keys(params || {}).length !== 0;

    const headers = new Headers();
    headers.append('Accept', 'application/json');
    headers.append('Content-Type', 'application/json');

    const opts = {
      headers,
      method: method,
      credentials: "same-origin"
    };

    if (hasBody) {
      opts.body = JSON.stringify(params);
    }

    return fetch(url, opts).then(this.checkStatus);
  }

  objectToUrlParams(obj, queryParams = [], prefixes = []) {
    for (let key in obj) {
      const val = obj[key];
      const paramName = prefixes.join("[") + "[".repeat(Math.min(prefixes.length, 1)) + encodeURIComponent(key) + "]".repeat(prefixes.length);
      if (Array.isArray(val)) {
        for (let x of val) {
          queryParams.push(paramName + "[]=" + (x === null ? '' : encodeURIComponent(x)));
        }
      } else if (typeof(val) === "object") {
        this.objectToUrlParams(val, queryParams, prefixes.concat([key]));
      } else {
        queryParams.push(paramName + "=" + (val === null ? '' : encodeURIComponent(val)));
      }
    }

    return queryParams;
  }

  get(url, params = {}) {

    const queryParams = this.objectToUrlParams(params);

    if (queryParams.length) {
      url = url + "?" + queryParams.join("&");
    }

    return this.performRequest(url, "GET");
  }

  post(url, params = {}) {
    return this.performRequest(url, "POST", params);
  }

  patch(url, params = {}) {
    return this.performRequest(url, "PATCH", params);
  }

  del(url, params = {}) {
    return this.performRequest(url, "DELETE", params);
  }

  getRecipeList(page, per, sortColumn, sortDirection, name, tags) {
    const params = {
      criteria: {
        page: page || null,
        per: per || null,
        sort_column: sortColumn || null,
        sort_direction: sortDirection || null,
        name: name || null,
        tags: tags || null
      }
    };

    return this.get("/recipes", params);
  }

  getRecipe(id) {
    return this.get("/recipes/" + id);
  }

  buildRecipeParams(recipe) {
    const params = {
      recipe: {
        name: recipe.name,
        description: recipe.description,
        source: recipe.source,
        yields: recipe.yields,
        total_time: recipe.total_time,
        active_time: recipe.active_time,
        step_text: recipe.step_text,
        tag_names: recipe.tag_names,
        recipe_ingredients_attributes: recipe.ingredients.map(i => {
          if (i._destroy) {
            return {
              id: i.id,
              _destroy: true
            };
          } else {
            return {
              id: i.id,
              name: i.name,
              ingredient_id: i.ingredient_id,
              quantity: i.quantity,
              units: i.units,
              preparation: i.preparation,
              sort_order: i.sort_order
            };
          }
        })
      }
    };
    return params;
  }

  patchRecipe(recipe) {
    return this.patch("/recipes/" + recipe.id, this.buildRecipeParams(recipe));
  }

  postRecipe(recipe) {
    return this.post("/recipes/", this.buildRecipeParams(recipe));
  }

  postPreviewSteps(step_text) {
    const params = {
      step_text: step_text
    };

    return this.post("/recipes/preview_steps", params);
  }

  getSearchIngredients(query) {
    const params = { query: query };
    return this.get("/ingredients/search", params);
  }

  getCalculate(input, output_unit, density) {
    const params = {
      input,
      output_unit,
      density
    };
    return this.get("/calculator/calculate", params);
  }

  getIngredientList(page, per, name) {
    const params = {
      page,
      per,
      name
    };

    return this.get("/ingredients/", params);
  }

  getIngredient(id) {
    return this.get("/ingredients/" + id);
  }

  buildIngredientParams(ingredient) {
    return {
      ingredient: {
        name: ingredient.name,
        notes: ingredient.notes,
        ndbn: ingredient.ndbn,
        density: ingredient.density,

        water: ingredient.water,
        ash: ingredient.ash,
        protein: ingredient.protein,
        kcal: ingredient.kcal,
        fiber: ingredient.fiber,
        sugar: ingredient.sugar,
        carbohydrates: ingredient.carbohydrates,
        calcium: ingredient.calcium,
        iron: ingredient.iron,
        magnesium: ingredient.magnesium,
        phosphorus: ingredient.phosphorus,
        potassium: ingredient.potassium,
        sodium: ingredient.sodium,
        zinc: ingredient.zinc,
        copper: ingredient.copper,
        manganese: ingredient.manganese,
        vit_c: ingredient.vit_c,
        vit_b6: ingredient.vit_b6,
        vit_b12: ingredient.vit_b12,
        vit_a: ingredient.vit_a,
        vit_e: ingredient.vit_e,
        vit_d: ingredient.vit_d,
        vit_k: ingredient.vit_k,
        cholesterol: ingredient.cholesterol,
        lipids: ingredient.lipids,


        ingredient_units_attributes: ingredient.ingredient_units.map(iu => {
          if (iu._destroy) {
            return {
              id: iu.id,
              _destroy: true
            };
          } else {
            return {
              id: iu.id,
              name: iu.name,
              gram_weight: iu.gram_weight
            };
          }
        })
      }
    }
  }

  postIngredient(ingredient) {
    return this.post("/ingredients/", this.buildIngredientParams(ingredient));
  }

  patchIngredient(ingredient) {
    return this.patch("/ingredients/" + ingredient.id, this.buildIngredientParams(ingredient));
  }

  postIngredientSelectNdbn(ingredient) {
    const url = ingredient.id ? "/ingredients/" + ingredient.id + "/select_ndbn" : "/ingredients/select_ndbn";
    return this.post(url, this.buildIngredientParams(ingredient));
  }

  getUsdaFoodSearch(query) {
    return this.get("/ingredients/usda_food_search", {query: query});
  }

  getNoteList() {
    return this.get("/notes/");
  }

  postNote(note) {
    const params = {
      content: note.content
    };

    return this.post("/notes/", params);
  }

  deleteNote(note) {
    return this.del("/notes/" + note.id);
  }

  postLogin(username, password) {
    const params = {
      username: username,
      password: password
    };

    return this.post("/login", params);
  }

  getLogout() {
    return this.get("/logout");
  }

  getCurrentUser() {
    return this.get("/user")
  }
}

const api = new Api();

export default api;