/**
 * AniWorld - Scan Manager Module
 *
 * Handles library scanning and progress overlay.
 *
 * Dependencies: constants.js, api-client.js, ui-utils.js
 */

var AniWorld = window.AniWorld || {};

AniWorld.ScanManager = (function() {
    'use strict';

    const API = AniWorld.Constants.API;
    const DEFAULTS = AniWorld.Constants.DEFAULTS;

    // State
    let scanTotalItems = 0;
    let lastScanData = null;

    /**
     * Initialize the scan manager
     */
    function init() {
        bindEvents();
        // Check scan status on page load
        checkActiveScanStatus();
    }

    /**
     * Bind UI events
     */
    function bindEvents() {
        const rescanBtn = document.getElementById('rescan-btn');
        if (rescanBtn) {
            rescanBtn.addEventListener('click', rescanSeries);
        }

        // Click on rescan status indicator to reopen scan overlay
        const rescanStatus = document.getElementById('rescan-status');
        if (rescanStatus) {
            rescanStatus.addEventListener('click', function(e) {
                e.stopPropagation();
                console.log('Rescan status clicked');
                reopenScanOverlay();
            });
        }
    }

    /**
     * Start a rescan of the series directory
     */
    async function rescanSeries() {
        try {
            // Show the overlay immediately before making the API call
            showScanProgressOverlay({
                directory: 'Starting scan...',
                total_items: 0
            });
            updateProcessStatus('rescan', true);

            const response = await AniWorld.ApiClient.post(API.ANIME_RESCAN, {});

            if (!response) {
                removeScanProgressOverlay();
                updateProcessStatus('rescan', false);
                return;
            }
            const data = await response.json();

            // Debug logging
            console.log('Rescan response:', data);

            // Note: The scan progress will be updated via WebSocket events
            // The overlay will be closed when scan_completed is received
            if (data.success !== true) {
                removeScanProgressOverlay();
                updateProcessStatus('rescan', false);
                AniWorld.UI.showToast('Rescan error: ' + data.message, 'error');
            }
        } catch (error) {
            console.error('Rescan error:', error);
            removeScanProgressOverlay();
            updateProcessStatus('rescan', false);
            AniWorld.UI.showToast('Failed to start rescan', 'error');
        }
    }

    /**
     * Show the scan progress overlay
     * @param {Object} data - Scan started event data
     */
    function showScanProgressOverlay(data) {
        // Remove existing overlay if present
        removeScanProgressOverlay();

        // Store total items for progress calculation
        scanTotalItems = data?.total_items || 0;

        // Store last scan data for reopening
        lastScanData = data;

        // Create overlay element
        const overlay = document.createElement('div');
        overlay.id = 'scan-progress-overlay';
        overlay.className = 'scan-progress-overlay';

        const totalDisplay = scanTotalItems > 0 ? scanTotalItems : '...';

        overlay.innerHTML =
            '<div class="scan-progress-container">' +
            '<div class="scan-progress-header">' +
            '<h3>' +
            '<span class="scan-progress-spinner"></span>' +
            '<i class="fas fa-check-circle scan-completed-icon"></i>' +
            '<span class="scan-title-text">Scanning Library</span>' +
            '</h3>' +
            '</div>' +
            '<div class="scan-progress-bar-container">' +
            '<div class="scan-progress-bar" id="scan-progress-bar" style="width: 0%"></div>' +
            '</div>' +
            '<div class="scan-progress-text" id="scan-progress-text">' +
            '<span id="scan-current-count">0</span> / <span id="scan-total-count">' + totalDisplay + '</span> directories' +
            '</div>' +
            '<div class="scan-progress-stats">' +
            '<div class="scan-stat">' +
            '<span class="scan-stat-value" id="scan-directories-count">0</span>' +
            '<span class="scan-stat-label">Scanned</span>' +
            '</div>' +
            '<div class="scan-stat">' +
            '<span class="scan-stat-value" id="scan-files-count">0</span>' +
            '<span class="scan-stat-label">Series Found</span>' +
            '</div>' +
            '</div>' +
            '<div class="scan-current-directory" id="scan-current-directory">' +
            '<span class="scan-current-directory-label">Current:</span>' +
            '<span id="scan-current-path">' + AniWorld.UI.escapeHtml(data?.directory || 'Initializing...') + '</span>' +
            '</div>' +
            '<div class="scan-elapsed-time hidden" id="scan-elapsed-time">' +
            '<i class="fas fa-clock"></i>' +
            '<span id="scan-elapsed-value">0.0s</span>' +
            '</div>' +
            '</div>';

        document.body.appendChild(overlay);

        // Add click-outside-to-close handler
        overlay.addEventListener('click', function(e) {
            // Only close if clicking the overlay background, not the container
            if (e.target === overlay) {
                removeScanProgressOverlay();
            }
        });

        // Trigger animation by adding visible class after a brief delay
        requestAnimationFrame(function() {
            overlay.classList.add('visible');
        });
    }

    /**
     * Update the scan progress overlay
     * @param {Object} data - Scan progress event data
     */
    function updateScanProgressOverlay(data) {
        const overlay = document.getElementById('scan-progress-overlay');
        if (!overlay) return;

        // Update total items if provided
        if (data.total_items && data.total_items > 0) {
            scanTotalItems = data.total_items;
            const totalCount = document.getElementById('scan-total-count');
            if (totalCount) {
                totalCount.textContent = scanTotalItems;
            }
        }

        // Update progress bar
        const progressBar = document.getElementById('scan-progress-bar');
        if (progressBar && scanTotalItems > 0 && data.directories_scanned !== undefined) {
            const percentage = Math.min(100, (data.directories_scanned / scanTotalItems) * 100);
            progressBar.style.width = percentage + '%';
        }

        // Update current/total count display
        const currentCount = document.getElementById('scan-current-count');
        if (currentCount && data.directories_scanned !== undefined) {
            currentCount.textContent = data.directories_scanned;
        }

        // Update directories count
        const dirCount = document.getElementById('scan-directories-count');
        if (dirCount && data.directories_scanned !== undefined) {
            dirCount.textContent = data.directories_scanned;
        }

        // Update files/series count
        const filesCount = document.getElementById('scan-files-count');
        if (filesCount && data.files_found !== undefined) {
            filesCount.textContent = data.files_found;
        }

        // Update current directory (truncate if too long)
        const currentPath = document.getElementById('scan-current-path');
        if (currentPath && data.current_directory) {
            const maxLength = 50;
            let displayPath = data.current_directory;
            if (displayPath.length > maxLength) {
                displayPath = '...' + displayPath.slice(-maxLength + 3);
            }
            currentPath.textContent = displayPath;
            currentPath.title = data.current_directory;
        }
    }

    /**
     * Hide the scan progress overlay with completion summary
     * @param {Object} data - Scan completed event data
     */
    function hideScanProgressOverlay(data) {
        const overlay = document.getElementById('scan-progress-overlay');
        if (!overlay) return;

        const container = overlay.querySelector('.scan-progress-container');
        if (container) {
            container.classList.add('completed');
        }

        // Update title
        const titleText = overlay.querySelector('.scan-title-text');
        if (titleText) {
            titleText.textContent = 'Scan Complete';
        }

        // Complete the progress bar
        const progressBar = document.getElementById('scan-progress-bar');
        if (progressBar) {
            progressBar.style.width = '100%';
        }

        // Update final stats
        if (data) {
            const dirCount = document.getElementById('scan-directories-count');
            if (dirCount && data.total_directories !== undefined) {
                dirCount.textContent = data.total_directories;
            }

            const filesCount = document.getElementById('scan-files-count');
            if (filesCount && data.total_files !== undefined) {
                filesCount.textContent = data.total_files;
            }

            // Update progress text to show final count
            const currentCount = document.getElementById('scan-current-count');
            const totalCount = document.getElementById('scan-total-count');
            if (currentCount && data.total_directories !== undefined) {
                currentCount.textContent = data.total_directories;
            }
            if (totalCount && data.total_directories !== undefined) {
                totalCount.textContent = data.total_directories;
            }

            // Show elapsed time
            const elapsedTimeEl = document.getElementById('scan-elapsed-time');
            const elapsedValueEl = document.getElementById('scan-elapsed-value');
            if (elapsedTimeEl && elapsedValueEl && data.elapsed_seconds !== undefined) {
                elapsedValueEl.textContent = data.elapsed_seconds.toFixed(1) + 's';
                elapsedTimeEl.classList.remove('hidden');
            }

            // Update current directory to show completion message
            const currentPath = document.getElementById('scan-current-path');
            if (currentPath) {
                currentPath.textContent = 'Scan finished successfully';
            }
        }

        // Auto-dismiss after 3 seconds
        setTimeout(function() {
            removeScanProgressOverlay();
        }, DEFAULTS.SCAN_AUTO_DISMISS);
    }

    /**
     * Remove the scan progress overlay from the DOM
     */
    function removeScanProgressOverlay() {
        const overlay = document.getElementById('scan-progress-overlay');
        if (overlay) {
            overlay.classList.remove('visible');
            // Wait for fade out animation before removing
            setTimeout(function() {
                if (overlay.parentElement) {
                    overlay.remove();
                }
            }, 300);
        }
    }

    /**
     * Reopen the scan progress overlay if a scan is in progress
     */
    async function reopenScanOverlay() {
        // Check if overlay already exists
        const existingOverlay = document.getElementById('scan-progress-overlay');
        if (existingOverlay) {
            return;
        }

        // Check if scan is running via API
        try {
            const response = await AniWorld.ApiClient.get(API.ANIME_SCAN_STATUS);
            if (!response || !response.ok) {
                console.log('Could not fetch scan status');
                return;
            }

            const data = await response.json();
            console.log('Scan status for reopen:', data);

            if (data.is_scanning) {
                // A scan is in progress, show the overlay
                showScanProgressOverlay({
                    directory: data.directory,
                    total_items: data.total_items
                });

                // Update with current progress
                updateScanProgressOverlay({
                    directories_scanned: data.directories_scanned,
                    files_found: data.directories_scanned,
                    current_directory: data.current_directory,
                    total_items: data.total_items
                });
            }
        } catch (error) {
            console.error('Error checking scan status for reopen:', error);
        }
    }

    /**
     * Check if a scan is currently in progress
     */
    async function checkActiveScanStatus() {
        try {
            const response = await AniWorld.ApiClient.get(API.ANIME_SCAN_STATUS);
            if (!response || !response.ok) {
                console.log('Could not fetch scan status, response:', response?.status);
                return;
            }

            const data = await response.json();
            console.log('Scan status check result:', data);

            if (data.is_scanning) {
                console.log('Scan is active, updating UI indicators');

                // Update the process status indicator
                updateProcessStatus('rescan', true);

                // Show the overlay
                showScanProgressOverlay({
                    directory: data.directory,
                    total_items: data.total_items
                });

                // Update with current progress
                updateScanProgressOverlay({
                    directories_scanned: data.directories_scanned,
                    files_found: data.directories_scanned,
                    current_directory: data.current_directory,
                    total_items: data.total_items
                });
            } else {
                console.log('No active scan detected');
                updateProcessStatus('rescan', false);
            }
        } catch (error) {
            console.error('Error checking scan status:', error);
        }
    }

    /**
     * Update process status indicator
     * @param {string} processName - Process name (e.g., 'rescan', 'download')
     * @param {boolean} isRunning - Whether the process is running
     * @param {boolean} hasError - Whether there's an error
     */
    function updateProcessStatus(processName, isRunning, hasError) {
        hasError = hasError || false;
        const statusElement = document.getElementById(processName + '-status');
        if (!statusElement) {
            console.warn('Process status element not found: ' + processName + '-status');
            return;
        }

        const statusDot = statusElement.querySelector('.status-dot');
        if (!statusDot) {
            console.warn('Status dot not found in ' + processName + '-status element');
            return;
        }

        // Remove all status classes
        statusDot.classList.remove('idle', 'running', 'error');
        statusElement.classList.remove('running', 'error', 'idle');

        // Capitalize process name for display
        const displayName = processName.charAt(0).toUpperCase() + processName.slice(1);

        if (hasError) {
            statusDot.classList.add('error');
            statusElement.classList.add('error');
            statusElement.title = displayName + ' error - click for details';
        } else if (isRunning) {
            statusDot.classList.add('running');
            statusElement.classList.add('running');
            statusElement.title = displayName + ' is running...';
        } else {
            statusDot.classList.add('idle');
            statusElement.classList.add('idle');
            statusElement.title = displayName + ' is idle';
        }

        console.log('Process status updated: ' + processName + ' = ' + (isRunning ? 'running' : (hasError ? 'error' : 'idle')));
    }

    // Public API
    return {
        init: init,
        rescanSeries: rescanSeries,
        showScanProgressOverlay: showScanProgressOverlay,
        updateScanProgressOverlay: updateScanProgressOverlay,
        hideScanProgressOverlay: hideScanProgressOverlay,
        removeScanProgressOverlay: removeScanProgressOverlay,
        reopenScanOverlay: reopenScanOverlay,
        checkActiveScanStatus: checkActiveScanStatus,
        updateProcessStatus: updateProcessStatus
    };
})();