package com.recipeapp.planning;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
import com.recipeapp.common.GlobalExceptionHandler;
import com.recipeapp.common.ValidationException;
import com.recipeapp.planning.dto.*;
import com.recipeapp.recipe.HouseholdResolver;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.mockito.InjectMocks;
import org.mockito.Mock;
import org.mockito.junit.jupiter.MockitoExtension;
import org.springframework.http.MediaType;
import org.springframework.test.web.servlet.MockMvc;
import org.springframework.test.web.servlet.setup.MockMvcBuilders;

import java.time.Instant;
import java.time.LocalDate;
import java.util.List;
import java.util.Map;
import java.util.UUID;

import static org.mockito.ArgumentMatchers.*;
import static org.mockito.Mockito.*;
import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.*;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.*;

@ExtendWith(MockitoExtension.class)
class WeekPlanControllerTest {

    private MockMvc mockMvc;
    private final ObjectMapper objectMapper = new ObjectMapper().registerModule(new JavaTimeModule());

    @Mock private PlanningService planningService;
    @Mock private HouseholdResolver householdResolver;

    @InjectMocks private WeekPlanController weekPlanController;

    private static final UUID HOUSEHOLD_ID = UUID.randomUUID();
    private static final UUID PLAN_ID = UUID.randomUUID();
    private static final UUID SLOT_ID = UUID.randomUUID();
    private static final LocalDate WEEK_START = LocalDate.of(2026, 4, 6);

    @BeforeEach
    void setUp() {
        mockMvc = MockMvcBuilders.standaloneSetup(weekPlanController)
                .setControllerAdvice(new GlobalExceptionHandler())
                .build();
    }

    @Test
    void getWeekPlanShouldReturn200() throws Exception {
        var plan = new WeekPlanResponse(PLAN_ID, WEEK_START, "draft", null, List.of());

        when(householdResolver.resolve("sarah@example.com")).thenReturn(HOUSEHOLD_ID);
        when(planningService.getWeekPlan(HOUSEHOLD_ID, WEEK_START)).thenReturn(plan);

        mockMvc.perform(get("/v1/week-plans")
                        .principal(() -> "sarah@example.com")
                        .param("weekStart", "2026-04-06"))
                .andExpect(status().isOk())
                .andExpect(jsonPath("$.weekStart").value("2026-04-06"))
                .andExpect(jsonPath("$.status").value("draft"));
    }

    @Test
    void createWeekPlanShouldReturn201() throws Exception {
        var plan = new WeekPlanResponse(PLAN_ID, WEEK_START, "draft", null, List.of());

        when(householdResolver.resolve("sarah@example.com")).thenReturn(HOUSEHOLD_ID);
        when(planningService.createWeekPlan(HOUSEHOLD_ID, WEEK_START)).thenReturn(plan);

        mockMvc.perform(post("/v1/week-plans")
                        .principal(() -> "sarah@example.com")
                        .contentType(MediaType.APPLICATION_JSON)
                        .content(objectMapper.writeValueAsString(new CreateWeekPlanRequest(WEEK_START))))
                .andExpect(status().isCreated())
                .andExpect(jsonPath("$.weekStart").value("2026-04-06"));
    }

    @Test
    void addSlotShouldReturn201() throws Exception {
        var recipeId = UUID.randomUUID();
        var slotRecipe = new SlotResponse.SlotRecipe(recipeId, "Spaghetti", "medium", (short) 45, null);
        var slot = new SlotResponse(SLOT_ID, WEEK_START.plusDays(1), slotRecipe);

        when(householdResolver.resolve("sarah@example.com")).thenReturn(HOUSEHOLD_ID);
        when(planningService.addSlot(eq(HOUSEHOLD_ID), eq(PLAN_ID), any(CreateSlotRequest.class)))
                .thenReturn(slot);

        mockMvc.perform(post("/v1/week-plans/{id}/slots", PLAN_ID)
                        .principal(() -> "sarah@example.com")
                        .contentType(MediaType.APPLICATION_JSON)
                        .content(objectMapper.writeValueAsString(
                                new CreateSlotRequest(WEEK_START.plusDays(1), recipeId))))
                .andExpect(status().isCreated())
                .andExpect(jsonPath("$.recipe.name").value("Spaghetti"));
    }

    @Test
    void updateSlotShouldReturn200() throws Exception {
        var recipeId = UUID.randomUUID();
        var slotRecipe = new SlotResponse.SlotRecipe(recipeId, "Stir Fry", "easy", (short) 15, null);
        var slot = new SlotResponse(SLOT_ID, WEEK_START.plusDays(1), slotRecipe);

        when(householdResolver.resolve("sarah@example.com")).thenReturn(HOUSEHOLD_ID);
        when(planningService.updateSlot(eq(HOUSEHOLD_ID), eq(PLAN_ID), eq(SLOT_ID),
                any(UpdateSlotRequest.class))).thenReturn(slot);

        mockMvc.perform(patch("/v1/week-plans/{planId}/slots/{slotId}", PLAN_ID, SLOT_ID)
                        .principal(() -> "sarah@example.com")
                        .contentType(MediaType.APPLICATION_JSON)
                        .content(objectMapper.writeValueAsString(new UpdateSlotRequest(recipeId))))
                .andExpect(status().isOk())
                .andExpect(jsonPath("$.recipe.name").value("Stir Fry"));
    }

    @Test
    void deleteSlotShouldReturn204() throws Exception {
        when(householdResolver.resolve("sarah@example.com")).thenReturn(HOUSEHOLD_ID);
        doNothing().when(planningService).deleteSlot(HOUSEHOLD_ID, PLAN_ID, SLOT_ID);

        mockMvc.perform(delete("/v1/week-plans/{planId}/slots/{slotId}", PLAN_ID, SLOT_ID)
                        .principal(() -> "sarah@example.com"))
                .andExpect(status().isNoContent());
    }

    @Test
    void confirmPlanShouldReturn200() throws Exception {
        var plan = new WeekPlanResponse(PLAN_ID, WEEK_START, "confirmed", Instant.now(), List.of());

        when(householdResolver.resolve("sarah@example.com")).thenReturn(HOUSEHOLD_ID);
        when(planningService.confirmPlan(HOUSEHOLD_ID, PLAN_ID)).thenReturn(plan);

        mockMvc.perform(post("/v1/week-plans/{id}/confirm", PLAN_ID)
                        .principal(() -> "sarah@example.com"))
                .andExpect(status().isOk())
                .andExpect(jsonPath("$.status").value("confirmed"));
    }

    @Test
    void confirmPlanShouldReturn422WhenNoSlots() throws Exception {
        when(householdResolver.resolve("sarah@example.com")).thenReturn(HOUSEHOLD_ID);
        when(planningService.confirmPlan(HOUSEHOLD_ID, PLAN_ID))
                .thenThrow(new ValidationException("Plan has no slots"));

        mockMvc.perform(post("/v1/week-plans/{id}/confirm", PLAN_ID)
                        .principal(() -> "sarah@example.com"))
                .andExpect(status().isUnprocessableEntity());
    }

    @Test
    void getSuggestionsShouldReturn200() throws Exception {
        var recipe = new SlotResponse.SlotRecipe(UUID.randomUUID(), "Stir Fry", "easy", (short) 15, null);
        var item = new SuggestionResponse.SuggestionItem(recipe,
                List.of("not_cooked_recently"), List.of());
        var response = new SuggestionResponse(List.of(item));

        when(householdResolver.resolve("sarah@example.com")).thenReturn(HOUSEHOLD_ID);
        when(planningService.getSuggestions(HOUSEHOLD_ID, PLAN_ID, WEEK_START.plusDays(2)))
                .thenReturn(response);

        mockMvc.perform(get("/v1/week-plans/{id}/suggestions", PLAN_ID)
                        .principal(() -> "sarah@example.com")
                        .param("slotDate", "2026-04-08"))
                .andExpect(status().isOk())
                .andExpect(jsonPath("$.suggestions[0].recipe.name").value("Stir Fry"))
                .andExpect(jsonPath("$.suggestions[0].fitReasons[0]").value("not_cooked_recently"));
    }

    @Test
    void getVarietyScoreShouldReturn200() throws Exception {
        var response = new VarietyScoreResponse(7.5, List.of(), List.of(),
                Map.of("easy", 2, "medium", 3, "hard", 2));

        when(householdResolver.resolve("sarah@example.com")).thenReturn(HOUSEHOLD_ID);
        when(planningService.getVarietyScore(HOUSEHOLD_ID, PLAN_ID)).thenReturn(response);

        mockMvc.perform(get("/v1/week-plans/{id}/variety-score", PLAN_ID)
                        .principal(() -> "sarah@example.com"))
                .andExpect(status().isOk())
                .andExpect(jsonPath("$.score").value(7.5));
    }
}