import { describe, it, expect, beforeEach, vi } from 'vitest';
import { mount } from '@vue/test-utils';
import { createPinia, setActivePinia } from 'pinia';
import { nextTick } from 'vue';

// Import components and utilities
import CoachSkillsToOffers from '~/pages/coach/skills-to-offers.vue';
import WizardRevenueStep from '~/components/WizardRevenueStep.vue';
import { useOfferSuggestor } from '~/composables/useOfferSuggestor';
import { usePlanStore } from '~/stores/plan';
import { offerToStream, offersToStreams } from '~/utils/offerToStream';

// Create inline test data to replace removed sample imports
const membersSample = [
  { id: "1", name: "Maya Chen", role: "Designer", hourly: 32, availableHrs: 20 },
  { id: "2", name: "Alex Rodriguez", role: "Developer", hourly: 35, availableHrs: 30 },
  { id: "3", name: "Jordan Kim", role: "Writer", hourly: 28, availableHrs: 15 }
];

const skillsCatalogSample = [
  { id: "design", label: "UI/UX Design" },
  { id: "writing", label: "Technical Writing" },
  { id: "development", label: "Web Development" }
];

const problemsCatalogSample = [
  { 
    id: "unclear-pitch", 
    label: "Unclear value proposition", 
    examples: ["Need better messaging", "Confusing product pitch"]
  }
];

const sampleSelections = {
  selectedSkillsByMember: {
    "1": ["design"],
    "3": ["writing"]
  },
  selectedProblems: ["unclear-pitch"]
};

// Mock router
vi.mock('vue-router', () => ({
  useRouter: () => ({
    push: vi.fn()
  })
}));

// Mock stores
const mockStreamsStore = {
  streams: [],
  upsertStream: vi.fn(),
  removeStream: vi.fn()
};

vi.mock('~/stores/streams', () => ({
  useStreamsStore: () => mockStreamsStore
}));

describe('Coach Integration Tests', () => {
  let pinia: any;
  let planStore: any;

  beforeEach(() => {
    pinia = createPinia();
    setActivePinia(pinia);
    planStore = usePlanStore();
    
    // Reset stores
    planStore.members = [];
    planStore.streams = [];
    mockStreamsStore.streams = [];
    
    // Clear mocks
    vi.clearAllMocks();
  });

  describe('Offer Generation with Sample Data', () => {
    it('generates "Pitch Polish (2 days)" offer for Design+Writing and "Unclear pitch"', () => {
      const { suggestOffers } = useOfferSuggestor();
      
      // Setup input with sample data
      const input = {
        members: membersSample,
        selectedSkillsByMember: {
          [membersSample[0].id]: ['design'], // Maya: Design
          [membersSample[2].id]: ['writing'] // Jordan: Writing
        },
        selectedProblems: ['unclear-pitch']
      };
      
      const catalogs = {
        skills: skillsCatalogSample,
        problems: problemsCatalogSample
      };
      
      // Generate offers
      const offers = suggestOffers(input, catalogs);
      
      // Should generate at least one offer
      expect(offers.length).toBeGreaterThan(0);
      
      // Should include Pitch Polish offer
      const pitchPolishOffer = offers.find(offer => 
        offer.name.includes('Pitch Polish') && offer.name.includes('2 days')
      );
      
      expect(pitchPolishOffer).toBeDefined();
      expect(pitchPolishOffer?.name).toBe('Pitch Polish (2 days)');
    });

    it('calculates baseline price using correct formula: sum(hours*hourly*1.25) * 1.10', () => {
      const { suggestOffers } = useOfferSuggestor();
      
      const input = {
        members: membersSample,
        selectedSkillsByMember: {
          [membersSample[0].id]: ['design'], // Maya: 32€/h
          [membersSample[2].id]: ['writing'] // Jordan: 28€/h
        },
        selectedProblems: ['unclear-pitch']
      };
      
      const catalogs = {
        skills: skillsCatalogSample,
        problems: problemsCatalogSample
      };
      
      const offers = suggestOffers(input, catalogs);
      const pitchPolishOffer = offers.find(offer => 
        offer.name.includes('Pitch Polish')
      );
      
      expect(pitchPolishOffer).toBeDefined();
      
      // Calculate expected price manually
      // Pitch Polish is 2 days = 16 hours total (8 hours per day)
      // Assume hours are distributed between Maya and Jordan
      let expectedCost = 0;
      
      for (const allocation of pitchPolishOffer!.hoursByMember) {
        const member = membersSample.find(m => m.id === allocation.memberId);
        if (member) {
          expectedCost += allocation.hours * member.hourly * 1.25;
        }
      }
      
      const expectedBaseline = Math.round(expectedCost * 1.10);
      
      // Allow for ±1 rounding difference
      expect(pitchPolishOffer!.price.baseline).toBeCloseTo(expectedBaseline, 0);
      expect(Math.abs(pitchPolishOffer!.price.baseline - expectedBaseline)).toBeLessThanOrEqual(1);
    });

    it('generates offers that include required whyThis and riskNotes', () => {
      const { suggestOffers } = useOfferSuggestor();
      
      const input = {
        members: membersSample,
        selectedSkillsByMember: sampleSelections.selectedSkillsByMember,
        selectedProblems: sampleSelections.selectedProblems
      };
      
      const catalogs = {
        skills: skillsCatalogSample,
        problems: problemsCatalogSample
      };
      
      const offers = suggestOffers(input, catalogs);
      
      expect(offers.length).toBeGreaterThan(0);
      
      offers.forEach(offer => {
        expect(offer.whyThis).toBeDefined();
        expect(offer.whyThis.length).toBeGreaterThan(0);
        expect(offer.riskNotes).toBeDefined();
        expect(offer.riskNotes.length).toBeGreaterThan(0);
        expect(offer.price.calcNote).toBeDefined();
        expect(offer.price.calcNote.length).toBeGreaterThan(0);
      });
    });
  });

  describe('Coach Page Integration', () => {
    it('starts with empty data by default', async () => {
      const wrapper = mount(CoachSkillsToOffers, {
        global: {
          plugins: [pinia]
        }
      });

      // Should start with empty data
      expect(wrapper.vm.members).toEqual([]);
      expect(wrapper.vm.availableSkills).toEqual([]);
      expect(wrapper.vm.availableProblems).toEqual([]);
      expect(wrapper.vm.offers).toBeNull();
    });

    it('handles empty state gracefully with no offers generated', async () => {
      const wrapper = mount(CoachSkillsToOffers, {
        global: {
          plugins: [pinia]
        }
      });

      // Wait for any potential async operations
      await nextTick();
      await new Promise(resolve => setTimeout(resolve, 100));
      
      // Should have no offers with empty data
      expect(wrapper.vm.offers).toBeNull();
      expect(wrapper.vm.canRegenerate).toBe(false);
    });
  });

  describe('Stream Conversion and Validation', () => {
    it('converts offers to streams with correct structure', () => {
      const mockOffer = {
        id: 'test-offer',
        name: 'Test Offer (5 days)',
        scope: ['Test scope item'],
        hoursByMember: [
          { memberId: membersSample[0].id, hours: 20 },
          { memberId: membersSample[1].id, hours: 15 }
        ],
        price: { baseline: 2000, stretch: 2400, calcNote: 'Test calculation' },
        payoutDelayDays: 30,
        whyThis: ['Test reason 1', 'Test reason 2'],
        riskNotes: ['Test risk']
      };

      const stream = offerToStream(mockOffer, membersSample);

      expect(stream.id).toBe('offer-test-offer');
      expect(stream.name).toBe('Test Offer (5 days)');
      expect(stream.unitPrice).toBe(2000);
      expect(stream.payoutDelayDays).toBe(30);
      expect(stream.feePercent).toBe(3);
      expect(stream.notes).toBe('Test reason 1. Test reason 2');
      expect(stream.restrictions).toBe('General');
      expect(stream.certainty).toBe('Probable');
    });

    it('handles batch conversion correctly', () => {
      const offers = [
        {
          id: 'offer1',
          name: 'Workshop Offer',
          scope: [],
          hoursByMember: [{ memberId: membersSample[0].id, hours: 8 }],
          price: { baseline: 800, stretch: 960, calcNote: 'Workshop calc' },
          payoutDelayDays: 14,
          whyThis: ['Quick workshop'],
          riskNotes: ['Time constraint']
        },
        {
          id: 'offer2', 
          name: 'Sprint Offer',
          scope: [],
          hoursByMember: [{ memberId: membersSample[1].id, hours: 40 }],
          price: { baseline: 2000, stretch: 2400, calcNote: 'Sprint calc' },
          payoutDelayDays: 45,
          whyThis: ['Full development'],
          riskNotes: ['Scope creep']
        }
      ];

      const streams = offersToStreams(offers, membersSample);

      expect(streams.length).toBe(2);
      expect(streams[0].name).toBe('Workshop Offer');
      expect(streams[1].name).toBe('Sprint Offer');
      expect(streams[0].unitsPerMonth).toBe(1); // Workshop
      expect(streams[1].unitsPerMonth).toBe(0); // Sprint
    });
  });

  describe('Wizard Integration', () => {
    it('displays coach streams with proper highlighting', () => {
      // Add coach streams to plan store
      planStore.streams = [
        {
          id: 'offer-test',
          name: 'Test Coach Offer',
          unitPrice: 1500,
          unitsPerMonth: 0, // Needs setup
          payoutDelayDays: 30,
          feePercent: 3,
          notes: 'AI-suggested offer',
          targetMonthlyAmount: 0,
          category: 'services'
        }
      ];

      const wrapper = mount(WizardRevenueStep, {
        global: {
          plugins: [pinia]
        }
      });

      // Should show coach stream with special styling
      const coachStreamElements = wrapper.findAll('[data-testid="coach-stream"]');
      expect(coachStreamElements.length).toBeGreaterThan(0);
      
      // Should show hint about setting units
      expect(wrapper.text()).toContain('Setting just 1 unit per offer');
    });

    it('allows proceeding to Review when unitsPerMonth is set to 1', () => {
      // Setup coach stream with units set
      planStore.streams = [
        {
          id: 'offer-test',
          name: 'Test Coach Offer',
          unitPrice: 1500,
          unitsPerMonth: 1,
          payoutDelayDays: 30,
          feePercent: 3,
          targetMonthlyAmount: 1500,
          category: 'services'
        }
      ];

      const wrapper = mount(WizardRevenueStep, {
        global: {
          plugins: [pinia]
        }
      });

      // Should not show setup hint when units are configured
      expect(wrapper.text()).not.toContain('Setting just 1 unit per offer');
      
      // Should have proper monthly amount calculated
      const stream = planStore.streams[0];
      expect(stream.targetMonthlyAmount).toBe(1500); // 1500 * 1
    });

    it('calculates summary metrics correctly', () => {
      planStore.streams = [
        {
          id: 'offer-1',
          targetMonthlyAmount: 3000,
          payoutDelayDays: 30
        },
        {
          id: 'offer-2', 
          targetMonthlyAmount: 2000,
          payoutDelayDays: 45
        }
      ];

      const wrapper = mount(WizardRevenueStep, {
        global: {
          plugins: [pinia]
        }
      });

      // Top source should be 60% (3000 out of 5000 total)
      expect(wrapper.vm.getTopSourcePercentage()).toBe(60);
      
      // Weighted payout should be 36 days ((3000*30 + 2000*45) / 5000)
      expect(wrapper.vm.getWeightedPayoutDelay()).toBe(36);
    });
  });

  describe('Error Handling and Edge Cases', () => {
    it('handles empty selections gracefully', () => {
      const { suggestOffers } = useOfferSuggestor();
      
      const input = {
        members: membersSample,
        selectedSkillsByMember: {},
        selectedProblems: []
      };
      
      const catalogs = {
        skills: skillsCatalogSample,
        problems: problemsCatalogSample
      };
      
      const offers = suggestOffers(input, catalogs);
      
      // Should return empty array for invalid input
      expect(offers).toEqual([]);
    });

    it('handles missing members gracefully', () => {
      const mockOffer = {
        id: 'test',
        name: 'Test',
        scope: [],
        hoursByMember: [{ memberId: 'nonexistent', hours: 10 }],
        price: { baseline: 1000, stretch: 1200, calcNote: 'Test' },
        payoutDelayDays: 30,
        whyThis: ['Test'],
        riskNotes: ['Test']
      };

      expect(() => {
        offerToStream(mockOffer, membersSample);
      }).toThrow('Member not found: nonexistent');
    });

    it('handles zero amounts in calculations', () => {
      planStore.streams = [
        {
          id: 'test-1',
          targetMonthlyAmount: 0,
          payoutDelayDays: 30
        }
      ];

      const wrapper = mount(WizardRevenueStep, {
        global: {
          plugins: [pinia]
        }
      });

      expect(wrapper.vm.getTopSourcePercentage()).toBe(0);
      expect(wrapper.vm.getWeightedPayoutDelay()).toBe(0);
    });
  });
});