/**
 * Shared logic for the Day/Presence Modal
 * Handles UI interactions, assignments, and integrated reassign form.
 */

const ModalLogic = {
    // Configuration holding callbacks
    config: {
        onMarkPresence: async (status, date, userId) => { },
        onClearPresence: async (date, userId) => { },
        onReleaseParking: async (assignmentId) => { },
        onReassignParking: async (assignmentId, newUserId) => { },
        onReload: async () => { } // Callback to reload calendar data
    },

    // State
    currentAssignmentId: null,
    currentDate: null,
    currentUserId: null,

    init(config) {
        this.config = { ...this.config, ...config };
        this.setupEventListeners();
    },

    setupEventListeners() {
        // Close buttons
        document.getElementById('closeDayModal')?.addEventListener('click', () => {
            document.getElementById('dayModal').style.display = 'none';
        });

        // Status buttons
        document.querySelectorAll('#dayModal .status-btn').forEach(btn => {
            btn.addEventListener('click', () => {
                if (this.currentDate) {
                    this.config.onMarkPresence(btn.dataset.status, this.currentDate, this.currentUserId);
                }
            });
        });

        // Actions
        document.getElementById('clearDayBtn')?.addEventListener('click', () => {
            if (this.currentDate) {
                this.config.onClearPresence(this.currentDate, this.currentUserId);
            }
        });

        document.getElementById('releaseParkingBtn')?.addEventListener('click', () => {
            if (this.currentAssignmentId) {
                this.config.onReleaseParking(this.currentAssignmentId);
            }
        });

        document.getElementById('reassignParkingBtn')?.addEventListener('click', () => {
            this.showReassignForm();
        });

        // Reassign Form
        document.getElementById('cancelReassign')?.addEventListener('click', () => {
            this.hideReassignForm();
        });

        document.getElementById('confirmReassign')?.addEventListener('click', () => {
            const select = document.getElementById('reassignUser');
            this.config.onReassignParking(this.currentAssignmentId, select.value);
        });

        // Close on click outside
        window.addEventListener('click', (e) => {
            const modal = document.getElementById('dayModal');
            if (e.target === modal) {
                modal.style.display = 'none';
            }
        });
    },

    openModal(data) {
        const { dateStr, userName, presence, parking, userId, isReadOnly } = data;

        this.currentDate = dateStr;
        this.currentUserId = userId; // Optional, for team view
        this.currentAssignmentId = parking ? parking.id : null;

        const modal = document.getElementById('dayModal');
        const title = document.getElementById('dayModalTitle');
        const userLabel = document.getElementById('dayModalUser');

        title.textContent = utils.formatDateDisplay(dateStr);

        // Show/Hide User Name (for Team Calendar)
        if (userName && userLabel) {
            userLabel.textContent = userName;
            userLabel.style.display = 'block';
        } else if (userLabel) {
            userLabel.style.display = 'none';
        }

        // Highlight status
        document.querySelectorAll('#dayModal .status-btn').forEach(btn => {
            const status = btn.dataset.status;
            if (presence && presence.status === status) {
                btn.classList.add('active');
            } else {
                btn.classList.remove('active');
            }
        });

        // Clear button visibility
        const clearBtn = document.getElementById('clearDayBtn');
        if (presence) {
            clearBtn.style.display = 'block';
        } else {
            clearBtn.style.display = 'none';
        }

        // Parking Section & Reset Form
        this.hideReassignForm(); // Reset view to actions

        const parkingSection = document.getElementById('parkingSection');
        const parkingInfo = document.getElementById('parkingInfo');

        if (parking) {
            parkingSection.style.display = 'block';
            const spotName = parking.spot_display_name || parking.spot_id;
            parkingInfo.innerHTML = `<strong>Parcheggio:</strong> Posto ${spotName}`;
        } else {
            parkingSection.style.display = 'none';
        }

        modal.style.display = 'flex';
    },

    async showReassignForm() {
        if (!this.currentAssignmentId) return;

        const actionsDiv = document.getElementById('parkingActions');
        const formDiv = document.getElementById('reassignForm');

        actionsDiv.style.display = 'none';
        formDiv.style.display = 'flex';

        const select = document.getElementById('reassignUser');
        select.innerHTML = '<option value="">Caricamento utenti...</option>';

        // Load eligible users (Global API function assumed available)
        try {
            const response = await api.get(`/api/parking/eligible-users/${this.currentAssignmentId}`);
            if (!response || !response.ok) {
                const error = await response.json();
                alert(error.detail || 'Impossibile caricare gli utenti idonei');
                this.hideReassignForm();
                return;
            }

            const users = await response.json();
            select.innerHTML = '<option value="">Seleziona utente...</option>';
            select.innerHTML += '<option value="auto">Assegna automaticamente</option>';

            if (users.length === 0) {
                const option = document.createElement('option');
                option.disabled = true;
                option.textContent = "Nessun altro utente disponibile";
                select.appendChild(option);
            } else {
                users.forEach(user => {
                    const option = document.createElement('option');
                    option.value = user.id;
                    const officeInfo = user.office_name ? ` (${user.office_name})` : '';
                    option.textContent = user.name + officeInfo;
                    select.appendChild(option);
                });
            }
        } catch (e) {
            console.error(e);
            alert('Errore di rete');
            this.hideReassignForm();
        }
    },

    hideReassignForm() {
        document.getElementById('reassignForm').style.display = 'none';
        document.getElementById('parkingActions').style.display = 'flex';
    },

    closeModal() {
        document.getElementById('dayModal').style.display = 'none';
    }
};