package de.effigenix.application.inventory;

import de.effigenix.application.inventory.command.RemoveStockBatchCommand;
import de.effigenix.domain.inventory.*;
import de.effigenix.domain.masterdata.article.ArticleId;
import de.effigenix.shared.common.Quantity;
import de.effigenix.shared.common.RepositoryError;
import de.effigenix.shared.common.Result;
import de.effigenix.shared.common.UnitOfMeasure;
import de.effigenix.shared.persistence.UnitOfWork;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.mockito.Mock;
import org.mockito.junit.jupiter.MockitoExtension;

import java.math.BigDecimal;
import java.time.Instant;
import java.time.LocalDate;
import java.util.ArrayList;
import java.util.List;
import java.util.Optional;

import static org.assertj.core.api.Assertions.assertThat;
import static org.mockito.ArgumentMatchers.any;
import static org.mockito.Mockito.*;

@ExtendWith(MockitoExtension.class)
@DisplayName("RemoveStockBatch Use Case")
class RemoveStockBatchTest {

    @Mock private StockRepository stockRepository;
    @Mock private UnitOfWork unitOfWork;

    private RemoveStockBatch removeStockBatch;
    private StockBatchId batchId;
    private Stock existingStock;
    private RemoveStockBatchCommand validCommand;

    @BeforeEach
    void setUp() {
        removeStockBatch = new RemoveStockBatch(stockRepository, unitOfWork);
        lenient().when(unitOfWork.executeAtomically(any())).thenAnswer(inv -> ((java.util.function.Supplier<?>) inv.getArgument(0)).get());

        batchId = StockBatchId.of("batch-1");
        var batch = StockBatch.reconstitute(
                batchId,
                new BatchReference("BATCH-001", BatchType.PRODUCED),
                Quantity.reconstitute(new BigDecimal("10"), UnitOfMeasure.KILOGRAM),
                LocalDate.of(2026, 12, 31),
                StockBatchStatus.AVAILABLE,
                Instant.now()
        );

        existingStock = Stock.reconstitute(
                StockId.of("stock-1"),
                ArticleId.of("article-1"),
                StorageLocationId.of("location-1"),
                null, null,
                new ArrayList<>(List.of(batch)), List.of()
        );

        validCommand = new RemoveStockBatchCommand("stock-1", "batch-1", "5", "KILOGRAM");
    }

    @Test
    @DisplayName("should remove quantity from batch successfully")
    void shouldRemoveQuantitySuccessfully() {
        when(stockRepository.findById(StockId.of("stock-1")))
                .thenReturn(Result.success(Optional.of(existingStock)));
        when(stockRepository.save(any())).thenReturn(Result.success(null));

        var result = removeStockBatch.execute(validCommand);

        assertThat(result.isSuccess()).isTrue();
        verify(stockRepository).save(existingStock);
    }

    @Test
    @DisplayName("should fail with StockNotFound when stock does not exist")
    void shouldFailWhenStockNotFound() {
        when(stockRepository.findById(StockId.of("stock-1")))
                .thenReturn(Result.success(Optional.empty()));

        var result = removeStockBatch.execute(validCommand);

        assertThat(result.isFailure()).isTrue();
        assertThat(result.unsafeGetError()).isInstanceOf(StockError.StockNotFound.class);
        verify(stockRepository, never()).save(any());
    }

    @Test
    @DisplayName("should fail with RepositoryFailure when findById fails")
    void shouldFailWhenFindByIdFails() {
        when(stockRepository.findById(StockId.of("stock-1")))
                .thenReturn(Result.failure(new RepositoryError.DatabaseError("connection lost")));

        var result = removeStockBatch.execute(validCommand);

        assertThat(result.isFailure()).isTrue();
        assertThat(result.unsafeGetError()).isInstanceOf(StockError.RepositoryFailure.class);
        verify(stockRepository, never()).save(any());
    }

    @Test
    @DisplayName("should fail with RepositoryFailure when save fails")
    void shouldFailWhenSaveFails() {
        when(stockRepository.findById(StockId.of("stock-1")))
                .thenReturn(Result.success(Optional.of(existingStock)));
        when(stockRepository.save(any()))
                .thenReturn(Result.failure(new RepositoryError.DatabaseError("connection lost")));

        var result = removeStockBatch.execute(validCommand);

        assertThat(result.isFailure()).isTrue();
        assertThat(result.unsafeGetError()).isInstanceOf(StockError.RepositoryFailure.class);
    }

    @Test
    @DisplayName("should propagate domain error for batch not found")
    void shouldPropagateBatchNotFound() {
        when(stockRepository.findById(StockId.of("stock-1")))
                .thenReturn(Result.success(Optional.of(existingStock)));

        var cmd = new RemoveStockBatchCommand("stock-1", "nonexistent", "5", "KILOGRAM");
        var result = removeStockBatch.execute(cmd);

        assertThat(result.isFailure()).isTrue();
        assertThat(result.unsafeGetError()).isInstanceOf(StockError.BatchNotFound.class);
        verify(stockRepository, never()).save(any());
    }

    @Test
    @DisplayName("should fail with InvalidQuantity for invalid amount")
    void shouldFailForInvalidAmount() {
        var cmd = new RemoveStockBatchCommand("stock-1", "batch-1", "not-a-number", "KILOGRAM");
        when(stockRepository.findById(StockId.of("stock-1")))
                .thenReturn(Result.success(Optional.of(existingStock)));

        var result = removeStockBatch.execute(cmd);

        assertThat(result.isFailure()).isTrue();
        assertThat(result.unsafeGetError()).isInstanceOf(StockError.InvalidQuantity.class);
        verify(stockRepository, never()).save(any());
    }

    @Test
    @DisplayName("should fail with InvalidQuantity for invalid unit")
    void shouldFailForInvalidUnit() {
        var cmd = new RemoveStockBatchCommand("stock-1", "batch-1", "5", "INVALID");
        when(stockRepository.findById(StockId.of("stock-1")))
                .thenReturn(Result.success(Optional.of(existingStock)));

        var result = removeStockBatch.execute(cmd);

        assertThat(result.isFailure()).isTrue();
        assertThat(result.unsafeGetError()).isInstanceOf(StockError.InvalidQuantity.class);
        verify(stockRepository, never()).save(any());
    }
}
