'use client';

import { useState, useEffect, useCallback, useTransition } from 'react';
import { dailyClient, DailyHistoryFilters, DailySearchFilters, ReorderCheckboxesData } from '@/clients/daily-client';
import { DailyView, DailyCheckbox, UpdateDailyCheckboxData, DailyCheckboxType } from '@/lib/types';
import {
  toggleCheckbox as toggleCheckboxAction,
  addTodayCheckbox as addTodayCheckboxAction,
  addYesterdayCheckbox as addYesterdayCheckboxAction,
  updateCheckbox as updateCheckboxAction,
  deleteCheckbox as deleteCheckboxAction
} from '@/actions/daily';

interface UseDailyState {
  dailyView: DailyView | null;
  loading: boolean;
  refreshing: boolean; // Pour les refresh silencieux
  error: string | null;
  saving: boolean; // Pour indiquer les opérations en cours
  isPending: boolean; // Pour indiquer les server actions en cours
}

interface UseDailyActions {
  refreshDaily: () => Promise<void>;
  refreshDailySilent: () => Promise<void>;
  addTodayCheckbox: (text: string, type?: DailyCheckboxType, taskId?: string) => Promise<DailyCheckbox | null>;
  addYesterdayCheckbox: (text: string, type?: DailyCheckboxType, taskId?: string) => Promise<DailyCheckbox | null>;
  updateCheckbox: (checkboxId: string, data: UpdateDailyCheckboxData) => Promise<DailyCheckbox | null>;
  deleteCheckbox: (checkboxId: string) => Promise<void>;
  toggleCheckbox: (checkboxId: string) => Promise<void>;
  toggleAllToday: () => Promise<void>;
  toggleAllYesterday: () => Promise<void>;
  reorderCheckboxes: (data: ReorderCheckboxesData) => Promise<void>;
  goToPreviousDay: () => Promise<void>;
  goToNextDay: () => Promise<void>;
  goToToday: () => Promise<void>;
  setDate: (date: Date) => Promise<void>;
}

/**
 * Hook pour la gestion d'une vue daily spécifique
 */
export function useDaily(initialDate?: Date, initialDailyView?: DailyView): UseDailyState & UseDailyActions & { currentDate: Date } {
  const [currentDate, setCurrentDate] = useState<Date>(initialDate || new Date());
  const [dailyView, setDailyView] = useState<DailyView | null>(initialDailyView || null);
  const [loading, setLoading] = useState(!initialDailyView); // Pas de loading si on a des données SSR
  const [refreshing, setRefreshing] = useState(false); // Pour les refresh silencieux
  const [error, setError] = useState<string | null>(null);
  const [saving, setSaving] = useState(false);
  const [isPending, startTransition] = useTransition();

  const refreshDaily = useCallback(async () => {
    try {
      setLoading(true);
      setError(null);
      
      const view = await dailyClient.getDailyView(currentDate);
      setDailyView(view);
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Erreur lors du chargement du daily');
      console.error('Erreur refreshDaily:', err);
    } finally {
      setLoading(false);
    }
  }, [currentDate]);

  const refreshDailySilent = useCallback(async () => {
    try {
      setRefreshing(true);
      // Refresh silencieux sans setLoading(true) pour éviter le clignotement
      const view = await dailyClient.getDailyView(currentDate);
      setDailyView(view);
    } catch (err) {
      console.error('Erreur refreshDailySilent:', err);
      // On n'affiche pas l'erreur pour ne pas perturber l'UX
    } finally {
      setRefreshing(false);
    }
  }, [currentDate]);

  const addTodayCheckbox = useCallback((text: string, type?: DailyCheckboxType, taskId?: string): Promise<DailyCheckbox | null> => {
    if (!dailyView) return Promise.resolve(null);

    return new Promise((resolve) => {
      startTransition(async () => {
        try {
          setError(null);
          
          const result = await addTodayCheckboxAction(text, taskId);
          
          if (result.success && result.data) {
            // Mise à jour optimiste
            setDailyView(prev => prev ? {
              ...prev,
              today: [...prev.today, result.data!].sort((a, b) => a.order - b.order)
            } : null);
            resolve(result.data);
          } else {
            setError(result.error || 'Erreur lors de l\'ajout de la checkbox');
            resolve(null);
          }
        } catch (err) {
          setError(err instanceof Error ? err.message : 'Erreur lors de l\'ajout de la checkbox');
          console.error('Erreur addTodayCheckbox:', err);
          resolve(null);
        }
      });
    });
  }, [dailyView]);

  const addYesterdayCheckbox = useCallback((text: string, type?: DailyCheckboxType, taskId?: string): Promise<DailyCheckbox | null> => {
    if (!dailyView) return Promise.resolve(null);

    return new Promise((resolve) => {
      startTransition(async () => {
        try {
          setError(null);
          
          const result = await addYesterdayCheckboxAction(text, taskId);
          
          if (result.success && result.data) {
            // Mise à jour optimiste
            setDailyView(prev => prev ? {
              ...prev,
              yesterday: [...prev.yesterday, result.data!].sort((a, b) => a.order - b.order)
            } : null);
            resolve(result.data);
          } else {
            setError(result.error || 'Erreur lors de l\'ajout de la checkbox');
            resolve(null);
          }
        } catch (err) {
          setError(err instanceof Error ? err.message : 'Erreur lors de l\'ajout de la checkbox');
          console.error('Erreur addYesterdayCheckbox:', err);
          resolve(null);
        }
      });
    });
  }, [dailyView]);

  const updateCheckbox = useCallback((checkboxId: string, data: UpdateDailyCheckboxData): Promise<DailyCheckbox | null> => {
    if (!dailyView) return Promise.resolve(null);

    return new Promise((resolve) => {
      startTransition(async () => {
        try {
          setError(null);
          
          const result = await updateCheckboxAction(checkboxId, data);
          
          if (result.success && result.data) {
            // Mise à jour optimiste
            setDailyView(prev => prev ? {
              ...prev,
              yesterday: prev.yesterday.map(cb => cb.id === checkboxId ? result.data! : cb),
              today: prev.today.map(cb => cb.id === checkboxId ? result.data! : cb)
            } : null);
            resolve(result.data);
          } else {
            setError(result.error || 'Erreur lors de la mise à jour de la checkbox');
            resolve(null);
          }
        } catch (err) {
          setError(err instanceof Error ? err.message : 'Erreur lors de la mise à jour de la checkbox');
          console.error('Erreur updateCheckbox:', err);
          resolve(null);
        }
      });
    });
  }, [dailyView]);

  const deleteCheckbox = useCallback((checkboxId: string): Promise<void> => {
    if (!dailyView) return Promise.resolve();

    return new Promise((resolve) => {
      startTransition(async () => {
        const previousDailyView = dailyView;

        // Mise à jour optimiste IMMÉDIATE - supprimer la checkbox
        setDailyView(prev => prev ? {
          ...prev,
          yesterday: prev.yesterday.filter(cb => cb.id !== checkboxId),
          today: prev.today.filter(cb => cb.id !== checkboxId)
        } : null);

        try {
          const result = await deleteCheckboxAction(checkboxId);
          
          if (!result.success) {
            // Rollback en cas d'erreur
            setDailyView(previousDailyView);
            setError(result.error || 'Erreur lors de la suppression de la checkbox');
          }
          resolve();
        } catch (err) {
          // Rollback en cas d'erreur
          setDailyView(previousDailyView);
          setError(err instanceof Error ? err.message : 'Erreur lors de la suppression de la checkbox');
          console.error('Erreur deleteCheckbox:', err);
          resolve();
        }
      });
    });
  }, [dailyView]);

  const toggleCheckbox = useCallback((checkboxId: string): Promise<void> => {
    if (!dailyView) return Promise.resolve();

    return new Promise((resolve) => {
      startTransition(async () => {
        // Trouver la checkbox dans yesterday ou today
        let checkbox = dailyView.yesterday.find(cb => cb.id === checkboxId);
        if (!checkbox) {
          checkbox = dailyView.today.find(cb => cb.id === checkboxId);
        }
        
        if (!checkbox) {
          resolve();
          return;
        }

        // Mise à jour optimiste IMMÉDIATE
        const newCheckedState = !checkbox.isChecked;
        const previousDailyView = dailyView;
        
        setDailyView(prev => prev ? {
          ...prev,
          yesterday: prev.yesterday.map(cb => 
            cb.id === checkboxId ? { ...cb, isChecked: newCheckedState } : cb
          ),
          today: prev.today.map(cb => 
            cb.id === checkboxId ? { ...cb, isChecked: newCheckedState } : cb
          )
        } : null);

        try {
          const result = await toggleCheckboxAction(checkboxId);
          
          if (!result.success) {
            // Rollback en cas d'erreur
            setDailyView(previousDailyView);
            setError(result.error || 'Erreur lors de la mise à jour de la checkbox');
          }
          resolve();
        } catch (err) {
          // Rollback en cas d'erreur
          setDailyView(previousDailyView);
          setError(err instanceof Error ? err.message : 'Erreur lors de la mise à jour de la checkbox');
          console.error('Erreur toggleCheckbox:', err);
          resolve();
        }
      });
    });
  }, [dailyView]);

  const toggleAllToday = useCallback(async (): Promise<void> => {
    if (!dailyView) return;

    const todayCheckboxes = dailyView.today;
    if (todayCheckboxes.length === 0) return;

    // Déterminer si on coche tout ou on décoche tout
    const allChecked = todayCheckboxes.every(cb => cb.isChecked);
    const newCheckedState = !allChecked;

    const previousDailyView = dailyView;

    // Mise à jour optimiste IMMÉDIATE
    setDailyView(prev => prev ? {
      ...prev,
      today: prev.today.map(cb => ({ ...cb, isChecked: newCheckedState }))
    } : null);

    try {
      // Appeler l'API pour chaque checkbox en parallèle
      await Promise.all(
        todayCheckboxes.map(checkbox => 
          dailyClient.updateCheckbox(checkbox.id, { isChecked: newCheckedState })
        )
      );
    } catch (err) {
      // Rollback en cas d'erreur
      setDailyView(previousDailyView);
      setError(err instanceof Error ? err.message : 'Erreur lors de la mise à jour des checkboxes');
      console.error('Erreur toggleAllToday:', err);
    }
  }, [dailyView]);

  const toggleAllYesterday = useCallback(async (): Promise<void> => {
    if (!dailyView) return;

    const yesterdayCheckboxes = dailyView.yesterday;
    if (yesterdayCheckboxes.length === 0) return;

    // Déterminer si on coche tout ou on décoche tout
    const allChecked = yesterdayCheckboxes.every(cb => cb.isChecked);
    const newCheckedState = !allChecked;

    const previousDailyView = dailyView;

    // Mise à jour optimiste IMMÉDIATE
    setDailyView(prev => prev ? {
      ...prev,
      yesterday: prev.yesterday.map(cb => ({ ...cb, isChecked: newCheckedState }))
    } : null);

    try {
      // Appeler l'API pour chaque checkbox en parallèle
      await Promise.all(
        yesterdayCheckboxes.map(checkbox => 
          dailyClient.updateCheckbox(checkbox.id, { isChecked: newCheckedState })
        )
      );
    } catch (err) {
      // Rollback en cas d'erreur
      setDailyView(previousDailyView);
      setError(err instanceof Error ? err.message : 'Erreur lors de la mise à jour des checkboxes');
      console.error('Erreur toggleAllYesterday:', err);
    }
  }, [dailyView]);

  const reorderCheckboxes = useCallback(async (data: ReorderCheckboxesData): Promise<void> => {
    try {
      setSaving(true);
      setError(null);
      
      await dailyClient.reorderCheckboxes(data);
      
      // Rafraîchir pour obtenir l'ordre correct
      await refreshDaily();
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Erreur lors du réordonnancement');
      console.error('Erreur reorderCheckboxes:', err);
    } finally {
      setSaving(false);
    }
  }, [refreshDaily]);

  const goToPreviousDay = useCallback(async (): Promise<void> => {
    const previousDay = new Date(currentDate);
    previousDay.setDate(previousDay.getDate() - 1);
    setCurrentDate(previousDay);
  }, [currentDate]);

  const goToNextDay = useCallback(async (): Promise<void> => {
    const nextDay = new Date(currentDate);
    nextDay.setDate(nextDay.getDate() + 1);
    setCurrentDate(nextDay);
  }, [currentDate]);

  const goToToday = useCallback(async (): Promise<void> => {
    setCurrentDate(new Date());
  }, []);

  const setDate = useCallback(async (date: Date): Promise<void> => {
    setCurrentDate(date);
  }, []);

  // État pour savoir si c'est le premier chargement
  const [isInitialLoad, setIsInitialLoad] = useState(!initialDailyView);

  // Charger le daily quand la date change
  useEffect(() => {
    if (isInitialLoad) {
      // Premier chargement : utiliser refreshDaily normal seulement si pas de données SSR
      if (!initialDailyView) {
        refreshDaily().finally(() => setIsInitialLoad(false));
      } else {
        setIsInitialLoad(false);
      }
    } else {
      // Changements suivants : utiliser refreshDailySilent
      refreshDailySilent();
    }
  }, [refreshDaily, refreshDailySilent, isInitialLoad, initialDailyView]);

  return {
    // State
    dailyView,
    loading,
    refreshing,
    error,
    saving,
    isPending,
    currentDate,
    
    // Actions
    refreshDaily,
    refreshDailySilent,
    addTodayCheckbox,
    addYesterdayCheckbox,
    updateCheckbox,
    deleteCheckbox,
    toggleCheckbox,
    toggleAllToday,
    toggleAllYesterday,
    reorderCheckboxes,
    goToPreviousDay,
    goToNextDay,
    goToToday,
    setDate
  };
}

/**
 * Hook pour l'historique des checkboxes
 */
export function useDailyHistory() {
  const [history, setHistory] = useState<{ date: Date; checkboxes: DailyCheckbox[] }[]>([]);
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState<string | null>(null);

  const loadHistory = useCallback(async (filters?: DailyHistoryFilters) => {
    try {
      setLoading(true);
      setError(null);
      
      const historyData = await dailyClient.getCheckboxHistory(filters);
      setHistory(historyData);
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Erreur lors du chargement de l\'historique');
      console.error('Erreur loadHistory:', err);
    } finally {
      setLoading(false);
    }
  }, []);

  const searchCheckboxes = useCallback(async (filters: DailySearchFilters) => {
    try {
      setLoading(true);
      setError(null);
      
      const checkboxes = await dailyClient.searchCheckboxes(filters);
      // Grouper par date pour l'affichage
      const groupedHistory = checkboxes.reduce((acc, checkbox) => {
        const dateKey = checkbox.date.toDateString();
        const existing = acc.find(item => item.date.toDateString() === dateKey);
        
        if (existing) {
          existing.checkboxes.push(checkbox);
        } else {
          acc.push({ date: checkbox.date, checkboxes: [checkbox] });
        }
        
        return acc;
      }, [] as { date: Date; checkboxes: DailyCheckbox[] }[]);
      
      setHistory(groupedHistory);
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Erreur lors de la recherche');
      console.error('Erreur searchCheckboxes:', err);
    } finally {
      setLoading(false);
    }
  }, []);

  return {
    history,
    loading,
    error,
    loadHistory,
    searchCheckboxes
  };
}