import {HTTP_INTERCEPTORS, HttpEvent, HttpHandler, HttpInterceptor, HttpRequest, HttpResponse} from '@angular/common/http';
import {Injectable} from '@angular/core';
import {Observable, of, throwError} from 'rxjs';
import {delay, dematerialize, materialize, mergeMap} from 'rxjs/operators';

const actions = [
  { id: 1, user: 'Tom', role: 'enroller', action: 'Disburse RSV 100', approval: false },
  { id: 2, user: 'Christine', role: 'admin', action: 'Change user phone number', approval: true },
  { id: 3, user: 'Will', role: 'superadmin', action: 'Reclaim RSV 1000', approval: true },
  { id: 4, user: 'Vivian', role: 'enroller', action: 'Complete user profile', approval: true },
  { id: 5, user: 'Jack', role: 'enroller', action: 'Reclaim RSV 200', approval: false },
  { id: 6, user: 'Patience', role: 'enroller', action: 'Change user information', approval: false }
];

const tokens = [
  {
    name: 'Giftable Reserve', symbol: 'GRZ', address: '0xa686005CE37Dce7738436256982C3903f2E4ea8E', supply: '1000000001000000000000000000',
    decimals: '18', reserves: {}
  },
  {
    name: 'Demo Token', symbol: 'DEMO', address: '0xc80D6aFF8194114c52AEcD84c9f15fd5c8abb187', supply: '99999999999999998976',
    decimals: '18', reserves: {'0xa686005CE37Dce7738436256982C3903f2E4ea8E': {weight: '1000000', balance: '99999999999999998976'}},
    reserveRatio: '1000000', owner: '0x3Da99AAD2D9CA01D131eFc3B17444b832B31Ff4a'
  },
  {
    name: 'Foo Token', symbol: 'FOO', address: '0x9ceD86089f7aBB5A97B40eb0E7521e7aa308d354', supply: '1000000000000000001014',
    decimals: '18', reserves: {'0xa686005CE37Dce7738436256982C3903f2E4ea8E': {weight: '1000000', balance: '1000000000000000001014'}},
    reserveRatio: '1000000', owner: '0x3Da99AAD2D9CA01D131eFc3B17444b832B31Ff4a'
  },
  {
    name: 'testb', symbol: 'tstb', address: '0xC63cFA91A3BFf41cE31Ff436f67D3ACBC977DB95', supply: '99000', decimals: '18',
    reserves: {'0xa686005CE37Dce7738436256982C3903f2E4ea8E': {weight: '1000000', balance: '99000'}}, reserveRatio: '1000000',
    owner: '0x3Da99AAD2D9CA01D131eFc3B17444b832B31Ff4a'
  },
  {
    name: 'testa', symbol: 'tsta', address: '0x8fA4101ef19D0a078239d035659e92b278bD083C', supply: '9981', decimals: '18',
    reserves: {'0xa686005CE37Dce7738436256982C3903f2E4ea8E': {weight: '1000000', balance: '9981'}}, reserveRatio: '1000000',
    owner: '0x3Da99AAD2D9CA01D131eFc3B17444b832B31Ff4a'
  },
  {
    name: 'testc', symbol: 'tstc', address: '0x4A6fA6bc3BfE4C9661bC692D9798425350C9e3D4', supply: '100990', decimals: '18',
    reserves: {'0xa686005CE37Dce7738436256982C3903f2E4ea8E': {weight: '1000000', balance: '100990'}}, reserveRatio: '1000000',
    owner: '0x3Da99AAD2D9CA01D131eFc3B17444b832B31Ff4a'
  }
];

const categories = [
  {
    name: 'system',
    products: ['system', 'office main', 'office main phone']
  },
  {
    name: 'education',
    products: ['book', 'coach', 'teacher', 'sch', 'school', 'pry', 'education', 'student', 'mwalimu', 'maalim', 'consultant', 'consult',
      'college', 'university', 'lecturer', 'primary', 'secondary', 'daycare', 'babycare', 'baby care', 'elim', 'eimu', 'nursery',
      'red cross', 'volunteer', 'instructor', 'journalist', 'lesson', 'academy', 'headmistress', 'headteacher', 'cyber', 'researcher',
      'professor', 'demo', 'expert', 'tution', 'tuition', 'children', 'headmaster', 'educator', 'Marital counsellor', 'counsellor',
      'trainer', 'vijana', 'youth', 'intern', 'redcross', 'KRCS', 'danish', 'science', 'data', 'facilitator', 'vitabu', 'kitabu']
  },
  {
    name: 'faith',
    products: ['pastor', 'imam', 'madrasa', 'religous', 'religious', 'ustadh', 'ustadhi', 'Marital counsellor', 'counsellor', 'church',
      'kanisa', 'mksiti', 'donor']
  },
  {
    name: 'government',
    products: ['elder', 'chief', 'police', 'government', 'country', 'county', 'soldier', 'village admin', 'ward', 'leader', 'kra',
      'mailman', 'immagration', 'immigration']
  },
  {
    name: 'environment',
    products: ['conservation', 'toilet', 'choo', 'garbage', 'fagio', 'waste', 'tree', 'taka', 'scrap', 'cleaning', 'gardener', 'rubbish',
      'usafi', 'mazingira', 'miti', 'trash', 'cleaner', 'plastic', 'collection', 'seedling', 'seedlings', 'recycling']
  },
  {
    name: 'farming',
    products: ['farm', 'farmer', 'farming', 'mkulima', 'kulima', 'ukulima', 'wakulima', 'jembe', 'shamba']
  },
  {
    name: 'labour',
    products: ['artist', 'agent', 'guard', 'askari', 'accountant', 'baker', 'beadwork', 'beauty', 'business', 'barber', 'casual',
      'electrian', 'caretaker', 'car wash', 'capenter', 'construction', 'chef', 'catering', 'cobler', 'cobbler', 'carwash', 'dhobi',
      'landlord', 'design', 'carpenter', 'fundi', 'hawking', 'hawker', 'househelp', 'hsehelp', 'house help', 'help', 'housegirl', 'kushona',
      'juakali', 'jualikali', 'juacali', 'jua kali', 'shepherd', 'makuti', 'kujenga', 'kinyozi', 'kazi', 'knitting', 'kufua', 'fua',
      'hustler', 'biashara', 'labour', 'labor', 'laundry', 'repair', 'hair', 'posho', 'mill', 'mtambo', 'uvuvi', 'engineer', 'manager',
      'tailor', 'nguo', 'mason', 'mtumba', 'garage', 'mechanic', 'mjenzi', 'mfugaji', 'painter', 'receptionist', 'printing', 'programming',
      'plumb', 'charging', 'salon', 'mpishi', 'msusi', 'mgema', 'footballer', 'photocopy', 'peddler', 'staff', 'sales', 'service', 'saloon',
      'seremala', 'security', 'insurance', 'secretary', 'shoe', 'shepard', 'shephard', 'tout', 'tv', 'mvuvi', 'mawe', 'majani', 'maembe',
      'freelance', 'mjengo', 'electronics', 'photographer', 'programmer', 'electrician', 'washing', 'bricks', 'welder', 'welding',
      'working', 'worker', 'watchman', 'waiter', 'waitress', 'viatu', 'yoga', 'guitarist', 'house', 'artisan', 'musician', 'trade',
      'makonge', 'ujenzi', 'vendor', 'watchlady', 'marketing', 'beautician', 'photo', 'metal work', 'supplier', 'law firm', 'brewer']
  },
  {
    name: 'food',
    products: ['avocado', 'bhajia', 'bajia', 'mbonga', 'bofu', 'beans', 'biscuits', 'biringanya', 'banana', 'bananas', 'crisps', 'chakula',
      'coconut', 'chapati', 'cereal', 'chipo', 'chapo', 'chai', 'chips', 'cassava', 'cake', 'cereals', 'cook', 'corn', 'coffee', 'chicken',
      'dagaa', 'donut', 'dough', 'groundnuts', 'hotel', 'holel', 'hoteli', 'butcher', 'butchery', 'fruit', 'food', 'fruits', 'fish',
      'githeri', 'grocery', 'grocer', 'pojo', 'papa', 'goats', 'mabenda', 'mbenda', 'poultry', 'soda', 'peanuts', 'potatoes', 'samosa',
      'soko', 'samaki', 'tomato', 'tomatoes', 'mchele', 'matunda', 'mango', 'melon', 'mellon', 'nyanya', 'nyama', 'omena', 'umena', 'ndizi',
      'njugu', 'kamba kamba', 'khaimati', 'kaimati', 'kunde', 'kuku', 'kahawa', 'keki', 'muguka', 'miraa', 'milk', 'choma', 'maziwa',
      'mboga', 'mbog', 'busaa', 'chumvi', 'cabbages', 'mabuyu', 'machungwa', 'mbuzi', 'mnazi', 'mchicha', 'ngombe', 'ngano', 'nazi',
      'oranges', 'peanuts', 'mkate', 'bread', 'mikate', 'vitungu', 'sausages', 'maize', 'mbata', 'mchuzi', 'mchuuzi', 'mandazi', 'mbaazi',
      'mahindi', 'maandazi', 'mogoka', 'meat', 'mhogo', 'mihogo', 'muhogo', 'maharagwe', 'miwa', 'mahamri', 'mitumba', 'simsim', 'porridge',
      'pilau', 'vegetable', 'egg', 'mayai', 'mifugo', 'unga', 'good', 'sima', 'sweet', 'sweats', 'sambusa', 'snacks', 'sugar', 'suger',
      'ugoro', 'sukari', 'soup', 'spinach', 'smokie', 'smokies', 'sukuma', 'tea', 'uji', 'ugali', 'uchuzi', 'uchuuzi', 'viazi', 'yoghurt',
      'yogurt', 'wine', 'marondo', 'maandzi', 'matoke', 'omeno', 'onions', 'nzugu', 'korosho', 'barafu', 'juice']
  },
  {
    name: 'water',
    products: ['maji', 'water']
  },
  {
    name: 'health',
    products: ['agrovet', 'dispensary', 'barakoa', 'chemist', 'Chemicals', 'chv', 'doctor', 'daktari', 'dawa', 'hospital', 'herbalist',
      'mganga', 'sabuni', 'soap', 'nurse', 'heath', 'community health worker', 'clinic', 'clinical', 'mask', 'medicine', 'lab technician',
      'pharmacy', 'cosmetics', 'veterinary', 'vet', 'sickly', 'emergency response', 'emergency']
  },
  {
    name: 'savings',
    products: ['chama', 'group', 'savings', 'loan', 'silc', 'vsla', 'credit', 'finance']
  },
  {
    name: 'shop',
    products: ['bag', 'bead', 'belt', 'bedding', 'jik', 'bed', 'cement', 'botique', 'boutique', 'lines', 'kibanda', 'kiosk', 'spareparts',
      'candy', 'cloth', 'electricals', 'mutumba', 'cafe', 'leso', 'lesso', 'duka', 'spare parts', 'socks', 'malimali', 'mitungi',
      'mali mali', 'hardware', 'detergent', 'detergents', 'dera', 'retail', 'kamba', 'pombe', 'pampers', 'pool', 'phone', 'simu', 'mangwe',
      'mikeka', 'movie', 'shop', 'acces', 'mchanga', 'uto', 'airtime', 'matress', 'mattress', 'mattresses', 'mpsea', 'mpesa', 'shirt',
      'wholesaler', 'perfume', 'playstation', 'tissue', 'vikapu', 'uniform', 'flowers', 'vitenge', 'utencils', 'utensils', 'station',
      'jewel', 'pool table', 'club', 'pub', 'bar', 'furniture', 'm-pesa', 'vyombo']
  },
  {
    name: 'transport',
    products: ['kebeba', 'beba', 'bebabeba', 'bike', 'bicycle', 'matatu', 'boda', 'bodaboda', 'cart', 'carrier', 'tour', 'travel', 'driver',
      'dereva', 'tout', 'conductor', 'kubeba', 'tuktuk', 'taxi', 'piki', 'pikipiki', 'manamba', 'trasportion', 'mkokoteni', 'mover',
      'motorist', 'motorbike', 'transport', 'transpoter', 'gari', 'magari', 'makanga', 'car']
  },
  {
    name: 'fuel/energy',
    products: ['timber', 'timberyard', 'biogas', 'charcol', 'charcoal', 'kuni', 'mbao', 'fuel', 'makaa', 'mafuta', 'moto', 'solar', 'stima',
      'fire', 'firewood', 'wood', 'oil', 'taa', 'gas', 'paraffin', 'parrafin', 'parafin', 'petrol', 'petro', 'kerosine', 'kerosene',
      'diesel']
  },
  {
    name: 'other',
    products: ['other', 'none', 'unknown', 'none']
  }
];

const areaNames = [
  {
    name: 'Mukuru Nairobi',
    locations: ['kayaba', 'kayba', 'kambi', 'mukuru', 'masai', 'hazina', 'south', 'tetra', 'tetrapak', 'ruben', 'rueben', 'kingston',
      'korokocho', 'kingstone', 'kamongo', 'lungalunga', 'sinai', 'sigei', 'lungu', 'lunga lunga', 'owino road', 'seigei']
  },
  {
    name: 'Kinango Kwale',
    locations: ['amani', 'bofu', 'chibuga', 'chikomani', 'chilongoni', 'chigojoni', 'chinguluni', 'chigato', 'chigale', 'chikole',
      'chilongoni', 'chilumani', 'chigojoni', 'chikomani', 'chizini', 'chikomeni', 'chidzuvini', 'chidzivuni', 'chikuyu', 'chizingo',
      'doti', 'dzugwe', 'dzivani', 'dzovuni', 'hanje', 'kasemeni', 'katundani', 'kibandaogo', 'kibandaongo', 'kwale', 'kinango',
      'kidzuvini', 'kalalani', 'kafuduni', 'kaloleni', 'kilibole', 'lutsangani', 'peku', 'gona', 'guro', 'gandini', 'mkanyeni', 'myenzeni',
      'miyenzeni', 'miatsiani', 'mienzeni', 'mnyenzeni', 'minyenzeni', 'miyani', 'mioleni', 'makuluni', 'mariakani', 'makobeni', 'madewani',
      'mwangaraba', 'mwashanga', 'miloeni', 'mabesheni', 'mazeras', 'mazera', 'mlola', 'muugano', 'mulunguni', 'mabesheni', 'miatsani',
      'miatsiani', 'mwache', 'mwangani', 'mwehavikonje', 'miguneni', 'nzora', 'nzovuni', 'vikinduni', 'vikolani', 'vitangani', 'viogato',
      'vyogato', 'vistangani', 'yapha', 'yava', 'yowani', 'ziwani', 'majengo', 'matuga', 'vigungani', 'vidziweni', 'vinyunduni', 'ukunda',
      'kokotoni', 'mikindani']
  },
  {
    name: 'Misc Nairobi',
    locations: ['nairobi', 'west', 'lindi', 'kibera', 'kibira', 'kibra', 'makina', 'soweto', 'olympic', 'kangemi', 'ruiru', 'congo',
      'kawangware', 'kwangware', 'donholm', 'dagoreti', 'dandora', 'kabete', 'sinai', 'donhom', 'donholm', 'huruma', 'kitengela',
      'makadara', ',mlolongo', 'kenyatta', 'mlolongo', 'tassia', 'tasia', 'gatina', '56', 'industrial', 'kariobangi', 'kasarani', 'kayole',
      'mathare', 'pipe', 'juja', 'uchumi', 'jogoo', 'umoja', 'thika', 'kikuyu', 'stadium', 'buru buru', 'ngong', 'starehe', 'mwiki',
      'fuata', 'kware', 'kabiro', 'embakassi', 'embakasi', 'kmoja', 'east', 'githurai', 'landi', 'langata', 'limuru', 'mathere',
      'dagoretti', 'kirembe', 'muugano', 'mwiki', 'toi market']
  },
  {
    name: 'Misc Mombasa',
    locations: ['mombasa', 'likoni', 'bangla', 'bangladesh', 'kizingo', 'old town', 'makupa', 'mvita', 'ngombeni', 'ngómbeni', 'ombeni',
      'magongo', 'miritini', 'changamwe', 'jomvu', 'ohuru', 'tudor', 'diani']
  },
  {
    name: 'Kisauni',
    locations: ['bamburi', 'kisauni', 'mworoni', 'nyali', 'shanzu', 'bombolulu', 'mtopanga', 'mjambere', 'majaoni', 'manyani', 'magogoni',
      'junda', 'mwakirunge', 'mshomoroni']
  },
  {
    name: 'Kilifi',
    locations: ['kilfi', 'kilifi', 'mtwapa', 'takaungu', 'makongeni', 'mnarani', 'mnarani', 'office', 'g.e', 'ge', 'raibai', 'ribe']
  },
  {
    name: 'Kakuma',
    locations: ['kakuma']
  },
  {
    name: 'Kitui',
    locations: ['kitui', 'mwingi']
  },
  {
    name: 'Nyanza',
    locations: ['busia', 'nyalgunga', 'mbita', 'siaya', 'kisumu', 'nyalenda', 'hawinga', 'rangala', 'uyoma', 'mumias', 'homabay', 'homaboy',
      'migori', 'kusumu']
  },
  {
    name: 'Misc Rural Counties',
    locations: ['makueni', 'meru', 'kisii', 'bomet', 'machakos', 'bungoma', 'eldoret', 'kakamega', 'kericho', 'kajiado', 'nandi', 'nyeri',
      'wote', 'kiambu', 'mwea', 'nakuru', 'narok']
  },
  {
    name: 'other',
    locations: ['other', 'none', 'unknown']
  }
];

const areaTypes = [
  {
    name: 'urban',
    area: ['urban', 'nairobi', 'mombasa']
  },
  {
    name: 'rural',
    area: ['rural', 'kakuma', 'kwale', 'kinango', 'kitui', 'nyanza']
  },
  {
    name: 'periurban',
    area: ['kilifi', 'periurban']
  },
  {
    name: 'other',
    area: ['other']
  }
];

@Injectable()
export class MockBackendInterceptor implements HttpInterceptor {
  intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
    const { url, method, headers, body } = request;

    // wrap in delayed observable to simulate server api call\
    // call materialize and dematerialize to ensure delay even is thrown
    return of(null)
      .pipe(mergeMap(handleRoute))
      .pipe(materialize())
      .pipe(delay(500))
      .pipe(dematerialize());

    function handleRoute(): Observable<any> {
      switch (true) {
        case url.endsWith('/actions') && method === 'GET':
          return getActions();
        case url.match(/\/actions\/\d+$/) && method === 'GET':
          return getActionById();
        case url.match(/\/actions\/\d+$/) && method === 'POST':
          return approveAction();
        case url.endsWith('/tokens') && method === 'GET':
          return getTokens();
        case url.match(/\/tokens\/\w+$/) && method === 'GET':
          return getTokenBySymbol();
        case url.endsWith('/categories') && method === 'GET':
          return getCategories();
        case url.match(/\/categories\/\w+$/) && method === 'GET':
          return getCategoryByProduct();
        case url.endsWith('/areanames') && method === 'GET':
          return getAreaNames();
        case url.match(/\/areanames\/\w+$/) && method === 'GET':
          return getAreaNameByLocation();
        case url.endsWith('/areatypes') && method === 'GET':
          return getAreaTypes();
        case url.match(/\/areatypes\/\w+$/) && method === 'GET':
          return getAreaTypeByArea();
        default:
          // pass through any requests not handled above
          return next.handle(request);
      }
    }

    // route functions

    function getActions(): Observable<any> {
      return ok(actions);
    }

    function getActionById(): Observable<any> {
      const queriedAction = actions.find(action => action.id === idFromUrl());
      return ok(queriedAction);
    }

    function approveAction(): Observable<any> {
      const queriedAction = actions.find(action => action.id === idFromUrl());
      queriedAction.approval = body.approval;
      const message = `Action approval status set to ${body.approval} successfully!`;
      return ok(message);
    }

    function getTokens(): Observable<any> {
      return ok(tokens);
    }

    function getTokenBySymbol(): Observable<any> {
      const queriedToken = tokens.find(token => token.symbol === stringFromUrl());
      return ok(queriedToken);
    }

    function getCategories(): Observable<any> {
      const categoryList = categories.map(category => category.name);
      return ok(categoryList);
    }

    function getCategoryByProduct(): Observable<any> {
      const queriedCategory = categories.find(category => category.products.includes(stringFromUrl()));
      return ok(queriedCategory.name);
    }

    function getAreaNames(): Observable<any> {
      const areaNameList = areaNames.map(areaName => areaName.name);
      return ok(areaNameList);
    }

    function getAreaNameByLocation(): Observable<any> {
      const queriedAreaName = areaNames.find(areaName => areaName.locations.includes(stringFromUrl()));
      return ok(queriedAreaName.name);
    }

    function getAreaTypes(): Observable<any> {
      const areaTypeList = areaTypes.map(areaType => areaType.name);
      return ok(areaTypeList);
    }

    function getAreaTypeByArea(): Observable<any> {
      const queriedAreaType = areaTypes.find(areaType => areaType.area.includes(stringFromUrl()));
      return ok(queriedAreaType.name);
    }

    // helper functions

    function ok(body): Observable<any> {
      return of(new HttpResponse({ status: 200, body }));
    }

    function error(message): Observable<any> {
      return throwError({ status: 400, error: { message } });
    }

    function idFromUrl(): number {
      const urlParts = url.split('/');
      return parseInt(urlParts[urlParts.length - 1], 10);
    }

    function stringFromUrl(): string {
      const urlParts = url.split('/');
      return urlParts[urlParts.length - 1];
    }
  }
}

export const MockBackendProvider = {
  provide: HTTP_INTERCEPTORS,
  useClass: MockBackendInterceptor,
  multi: true
};