import { describe, it, expect, vi, beforeEach } from 'vitest';
import { supabase } from '../supabase';

vi.mock('../supabase', () => {
  return {
    supabase: {
      from: vi.fn(),
      rpc: vi.fn(),
    },
  };
});

// Import code under test after mock definition
import { triggerCampaignSettlementOnApproval } from '../settlementTrigger';

describe('triggerCampaignSettlementOnApproval', () => {
  beforeEach(() => {
    vi.clearAllMocks();
  });

  it('successfully triggers campaign credit issuance and distribution based on actual activities', async () => {
    // 1. Mock external mapping and campaign query
    const mockMappingSingle = vi.fn().mockResolvedValue({
      data: {
        id: 'map-777',
        registry_code: 'VCS',
        internal_type: 'campaign',
        internal_id: 'camp-777',
        verification_level: 'submitted',
        campaigns: {
          id: 'camp-777',
          title: '제주 다회용 텀블러 에코 캠페인',
          nature_beneficiary_id: 'nature:ocean:jeju',
          nature_beneficiary_name: '제주 바다',
          target_co2_kg: 10000,
        },
      },
      error: null,
    });

    const mockMappingEq = vi.fn().mockReturnValue({
      single: mockMappingSingle,
    });

    const mockMappingSelect = vi.fn().mockReturnValue({
      eq: mockMappingEq,
    });

    // 2. Mock activities CO2 sum (e.g. 5,500,000 grams = 5.5 tCO2e = 5.5 TON)
    const mockActivitySelect = vi.fn().mockReturnValue({
      eq: vi.fn().mockReturnValue({
        eq: vi.fn().mockResolvedValue({
          data: [{ co2_grams: 5500000 }],
          error: null,
        }),
      }),
    });

    // 3. Mock distribution rules query (e.g. 70% Reserve, 20% SME, 10% Platform)
    const mockRulesSingle = vi.fn().mockResolvedValue({
      data: {
        reserve_rate: 0.70,
        donation_rate: 0.20,
        platform_rate: 0.10,
      },
      error: null,
    });

    const mockRulesEq = vi.fn().mockReturnValue({
      maybeSingle: mockRulesSingle,
    });

    const mockRulesSelect = vi.fn().mockReturnValue({
      eq: mockRulesEq,
    });

    // 4. Set up supabase.from routing mock
    vi.mocked(supabase.from).mockImplementation((table: string) => {
      if (table === 'external_project_mappings') {
        return { select: mockMappingSelect } as any;
      }
      if (table === 'activities') {
        return { select: mockActivitySelect } as any;
      }
      if (table === 'distribution_rules') {
        return { select: mockRulesSelect } as any;
      }
      return {} as any;
    });

    // 5. Mock append_ledger_entry RPC
    vi.mocked(supabase.rpc).mockResolvedValue({
      data: { id: 'led-1' },
      error: null,
    } as any);

    // 6. Act
    await expect(triggerCampaignSettlementOnApproval('map-777')).resolves.not.toThrow();

    // 7. Assertions - Credit Issuance Check (5,500,000g -> 5.5 TON)
    expect(supabase.rpc).toHaveBeenCalledWith('append_ledger_entry', expect.objectContaining({
      p_category: 'CREDIT_ISSUANCE',
      p_asset: 'TON',
      p_amount: 5.5,
      p_sender_id: 'VCS',
      p_receiver_id: 'nature:ocean:jeju',
    }));

    // Assertions - Distribution Checks
    // Reserve: 5.5 * 0.7 = 3.85 TON
    expect(supabase.rpc).toHaveBeenCalledWith('append_ledger_entry', expect.objectContaining({
      p_category: 'CREDIT_RETIRE',
      p_asset: 'TON',
      p_amount: 3.85,
      p_sender_id: 'nature:ocean:jeju',
      p_receiver_id: 'nature:ocean:jeju',
    }));

    // SME: 5.5 * 0.2 = 1.1 TON
    expect(supabase.rpc).toHaveBeenCalledWith('append_ledger_entry', expect.objectContaining({
      p_category: 'CREDIT_DONATION',
      p_asset: 'TON',
      p_amount: 1.1,
      p_sender_id: 'nature:ocean:jeju',
      p_receiver_id: 'sme:allocated',
    }));

    // Platform: 5.5 * 0.1 = 0.55 TON
    expect(supabase.rpc).toHaveBeenCalledWith('append_ledger_entry', expect.objectContaining({
      p_category: 'FEE_DEDUCTION',
      p_asset: 'TON',
      p_amount: 0.55,
      p_sender_id: 'nature:ocean:jeju',
      p_receiver_id: 'platform:fees',
    }));
  });

  it('falls back to campaign target_co2_kg when actual activities sum is 0', async () => {
    // 1. Mock external mapping and campaign query (target: 15,000 kg = 15 TON)
    const mockMappingSingle = vi.fn().mockResolvedValue({
      data: {
        id: 'map-888',
        registry_code: 'VCS',
        internal_type: 'campaign',
        internal_id: 'camp-888',
        verification_level: 'submitted',
        campaigns: {
          id: 'camp-888',
          title: '제주 다회용 텀블러 에코 캠페인',
          nature_beneficiary_id: 'nature:ocean:jeju',
          nature_beneficiary_name: '제주 바다',
          target_co2_kg: 15000,
        },
      },
      error: null,
    });

    const mockMappingEq = vi.fn().mockReturnValue({
      single: mockMappingSingle,
    });

    const mockMappingSelect = vi.fn().mockReturnValue({
      eq: mockMappingEq,
    });

    // Activities sum is 0
    const mockActivitySelect = vi.fn().mockReturnValue({
      eq: vi.fn().mockReturnValue({
        eq: vi.fn().mockResolvedValue({
          data: [],
          error: null,
        }),
      }),
    });

    // Mock distribution rules (no rules, falls back to default 70:20:10)
    const mockRulesSingle = vi.fn().mockResolvedValue({
      data: null,
      error: null,
    });

    const mockRulesEq = vi.fn().mockReturnValue({
      maybeSingle: mockRulesSingle,
    });

    const mockRulesSelect = vi.fn().mockReturnValue({
      eq: mockRulesEq,
    });

    vi.mocked(supabase.from).mockImplementation((table: string) => {
      if (table === 'external_project_mappings') {
        return { select: mockMappingSelect } as any;
      }
      if (table === 'activities') {
        return { select: mockActivitySelect } as any;
      }
      if (table === 'distribution_rules') {
        return { select: mockRulesSelect } as any;
      }
      return {} as any;
    });

    vi.mocked(supabase.rpc).mockResolvedValue({
      data: { id: 'led-2' },
      error: null,
    } as any);

    // 2. Act
    await expect(triggerCampaignSettlementOnApproval('map-888')).resolves.not.toThrow();

    // 3. Assertions - Fallback Credit Issuance (15,000 kg -> 15 TON)
    expect(supabase.rpc).toHaveBeenCalledWith('append_ledger_entry', expect.objectContaining({
      p_category: 'CREDIT_ISSUANCE',
      p_asset: 'TON',
      p_amount: 15,
      p_sender_id: 'VCS',
      p_receiver_id: 'nature:ocean:jeju',
    }));

    // Platform default 10%: 15 * 0.1 = 1.5 TON
    expect(supabase.rpc).toHaveBeenCalledWith('append_ledger_entry', expect.objectContaining({
      p_category: 'FEE_DEDUCTION',
      p_asset: 'TON',
      p_amount: 1.5,
    }));
  });

  it('prevents double issuance if the mapping is already approved', async () => {
    // Mapping already approved
    const mockMappingSingle = vi.fn().mockResolvedValue({
      data: {
        id: 'map-already',
        registry_code: 'VCS',
        internal_type: 'campaign',
        internal_id: 'camp-999',
        verification_level: 'approved',
      },
      error: null,
    });

    const mockMappingEq = vi.fn().mockReturnValue({
      single: mockMappingSingle,
    });

    const mockMappingSelect = vi.fn().mockReturnValue({
      eq: mockMappingEq,
    });

    vi.mocked(supabase.from).mockImplementation((table: string) => {
      if (table === 'external_project_mappings') {
        return { select: mockMappingSelect } as any;
      }
      return {} as any;
    });

    // Act & Assert
    await expect(triggerCampaignSettlementOnApproval('map-already')).rejects.toThrow(
      '[triggerCampaignSettlementOnApproval] 이미 승인 및 정산 완료된 매핑입니다. (ID: map-already)'
    );

    expect(supabase.rpc).not.toHaveBeenCalled();
  });
});