window.initSearch = function() {
    initSearchModal();
    initInlineSearch();
};

var searchLoadingPromise = null;

function debounce(fn, delay) {
    var timer;
    return function() {
        var context = this;
        var args = arguments;
        clearTimeout(timer);
        timer = setTimeout(function() { fn.apply(context, args); }, delay);
    };
}

function loadSearchIndex() {
    if (window.searchIndex) {
        return Promise.resolve(window.searchIndex);
    }
    
    if (searchLoadingPromise) {
        return searchLoadingPromise;
    }

    window.isSearchingLoading = true;
    searchLoadingPromise = fetch('/index.json')
        .then(response => {
            if (!response.ok) throw new Error(response.statusText);
            return response.json();
        })
        .then(data => {
            window.searchIndex = data;
            window.isSearchingLoading = false;
            searchLoadingPromise = null;
            return data;
        })
        .catch(err => {
            console.error('Failed to load search index:', err);
            window.isSearchingLoading = false;
            searchLoadingPromise = null;
            return null; // Return null on error to handle gracefully
        });
        
    return searchLoadingPromise;
}

function initSearchModal() {
    var searchBtn = document.getElementById('search-btn');
    var searchModal = document.getElementById('search-modal');
    
    if (searchBtn && searchModal) {
        // Clone to remove old listeners
        var newSearchBtn = searchBtn.cloneNode(true);
        searchBtn.parentNode.replaceChild(newSearchBtn, searchBtn);
        searchBtn = newSearchBtn;

        searchBtn.addEventListener('click', function() {
            searchModal.classList.add('show');
            var input = document.getElementById('search-input');
            if (input) setTimeout(function() { input.focus(); }, 100);
            
            loadSearchIndex();
        });

        // Close logic
        var closeBtn = searchModal.querySelector('.close-search');
        if (closeBtn) {
            closeBtn.onclick = function() {
                searchModal.classList.remove('show');
            };
        }
        
        // Click outside to close
        searchModal.onclick = function(e) {
            if (e.target === searchModal) {
                searchModal.classList.remove('show');
            }
        };

        // Search Input Logic
        var searchInput = document.getElementById('search-input');
        var searchResults = document.getElementById('search-results');
        
        if (searchInput && searchResults) {
            // Clone input to remove old listeners
             var newInput = searchInput.cloneNode(true);
             searchInput.parentNode.replaceChild(newInput, searchInput);
             searchInput = newInput;

            // Clone results to remove old listeners
             var newResults = searchResults.cloneNode(true);
             searchResults.parentNode.replaceChild(newResults, searchResults);
             searchResults = newResults;

            // Result click — use data-href to avoid pjax anchor conflicts
            searchResults.addEventListener('click', function(e) {
                var item = e.target.closest('.search-result-item');
                if (!item) return;
                var href = item.getAttribute('data-href');
                if (!href) return;
                e.preventDefault();
                e.stopPropagation();
                searchModal.classList.remove('show');
                searchModal.style.transition = 'none';
                requestAnimationFrame(function() {
                    requestAnimationFrame(function() {
                        searchModal.style.transition = '';
                    });
                });
                if (window.pjax) {
                    window.pjax.loadUrl(href, { triggerElement: item });
                } else {
                    window.location.href = href;
                }
            });

            searchInput.addEventListener('input', debounce(function() {
                var query = this.value.trim().toLowerCase();

                if (query.length === 0) {
                    searchResults.innerHTML = '<p class="search-tip">输入关键词并回车进行搜索</p>';
                    return;
                }

                if (!window.searchIndex) {
                    searchResults.innerHTML = '<p class="search-tip">索引加载中...</p>';
                    loadSearchIndex().then(function(data) {
                         if (data && searchInput.value.trim().length > 0) {
                             searchInput.dispatchEvent(new Event('input'));
                         } else if (!data) {
                             searchResults.innerHTML = '<p class="search-tip">索引加载失败</p>';
                         }
                    });
                    return;
                }

                var results = window.searchIndex.filter(function(item) {
                    return (item.title && item.title.toLowerCase().includes(query)) ||
                           (item.summary && item.summary.toLowerCase().includes(query));
                });

                if (results.length > 0) {
                    var html = results.map(function(item) {
                        var path = item.permalink.replace(/^https?:\/\/[^\/]+/, '');
                        return '<div class="search-result-item" data-href="' + path + '" role="link" tabindex="0">' +
                            '<span class="search-result-title">' + item.title + '</span>' +
                            '<span class="search-result-date">' + item.date + '</span>' +
                            '<div class="search-result-summary">' + (item.summary || '') + '</div>' +
                            '</div>';
                    }).join('');
                    searchResults.innerHTML = html;
                } else {
                    searchResults.innerHTML = '<p class="search-tip">未找到相关文章</p>';
                }
            }), 200);
        }
    }
}

function initInlineSearch() {
    var header = document.getElementById('essay-header');
    var searchContainer = document.getElementById('search-container');
    var input = document.getElementById('inline-search-input');
    var resultsContainer = document.getElementById('inline-search-results');
    
    window.toggleSearchMode = function(show) {
        if (!header || !searchContainer || !input || !resultsContainer) {
            console.warn('Search elements missing, cannot toggle mode.');
            return;
        }
        
        var searchHint = document.querySelector('.search-hint-wrapper');

        if (show) {
            if (searchHint) searchHint.style.display = 'none'; // Hide hint completely to avoid layout shifts
            header.style.display = 'none';
            searchContainer.style.display = 'block';
            input.focus();
            loadSearchIndex().then(() => {
                console.log('Search index loaded via toggle');
            }).catch(e => console.error('Search index load failed', e));
            // Add Esc key listener
            document.addEventListener('keydown', escListener);
        } else {
            if (searchHint) searchHint.style.display = ''; // Restore hint
            header.style.display = 'inline-flex'; 
            searchContainer.style.display = 'none';
            input.value = '';
            // Remove .has-value class
            searchContainer.querySelector('.search-input-group').classList.remove('has-value');
            resultsContainer.classList.remove('show');
            resultsContainer.innerHTML = '';
            // Remove Esc key listener
            document.removeEventListener('keydown', escListener);
        }
    };

    var escListener = function(e) {
        if (e.key === 'Escape') {
            window.toggleSearchMode(false);
        }
    };

    if (!header || !searchContainer || !input || !resultsContainer) return;

    // Input Event
    var newInput = input.cloneNode(true);
    input.parentNode.replaceChild(newInput, input);
    input = newInput;

    // Handle Search Icon Click (Focus input)
    var searchIcon = searchContainer.querySelector('.search-icon');
    if (searchIcon) {
        searchIcon.addEventListener('click', function() {
            input.focus();
        });
    }

    // Handle Close Icon Logic
    var closeIcon = searchContainer.querySelector('.close-icon');
    if (closeIcon) {
        // Remove inline onclick handler if present
        closeIcon.onclick = null; 
        closeIcon.removeAttribute('onclick');
        
        // Add new custom handler
        closeIcon.addEventListener('click', function(e) {
            e.preventDefault();
            e.stopPropagation();
            
            if (input.value.trim().length > 0) {
                // Clear input
                input.value = '';
                input.focus();
                // Trigger input event to update UI
                input.dispatchEvent(new Event('input'));
            } else {
                // Close search
                window.toggleSearchMode(false);
            }
        });
    }

    input.addEventListener('input', debounce(function() {
        var query = this.value.trim().toLowerCase();
        var inputGroup = this.closest('.search-input-group');
        
        // Toggle has-value class
        if (this.value.length > 0) {
            inputGroup.classList.add('has-value');
        } else {
            inputGroup.classList.remove('has-value');
        }
        
        if (query.length === 0) {
            resultsContainer.classList.remove('show');
            resultsContainer.innerHTML = '';
            return;
        }

        if (!window.searchIndex) {
            resultsContainer.innerHTML = '<div class="search-result-item no-result">索引加载中...</div>';
            resultsContainer.classList.add('show');
            
            loadSearchIndex().then(function(data) {
                // If data loaded successfully and user hasn't cleared input
                if (data && input.value.trim().length > 0) {
                     input.dispatchEvent(new Event('input'));
                } else if (!data) {
                    resultsContainer.innerHTML = '<div class="search-result-item no-result">索引加载失败</div>';
                }
            });
            return;
        }

        var results = window.searchIndex.filter(function(item) {
            return (item.title && item.title.toLowerCase().includes(query)) || 
                   (item.summary && item.summary.toLowerCase().includes(query));
        });

        if (results.length > 0) {
                    var html = results.slice(0, 5).map(function(item) {
                        var path = item.permalink.replace(/^https?:\/\/[^\/]+/, '');
                        return '<div class="search-result-item" data-href="' + path + '" role="link" tabindex="0">' +
                            '<span class="search-result-title">' + item.title + '</span>' +
                            '<div class="search-result-meta">' +
                                '<span class="search-result-date">' + item.date + '</span>' +
                                '<span class="search-result-summary-text">' + (item.summary || '') + '</span>' +
                            '</div>' +
                            '</div>';
                    }).join('');

                    resultsContainer.innerHTML = html;
                    resultsContainer.classList.add('show');
                } else {
            resultsContainer.innerHTML = '<div class="search-result-item no-result">暂无相关内容</div>';
            resultsContainer.classList.add('show');
        }
    }), 200);

    // Close on click outside
    if (!window.inlineSearchClickOutside) {
        window.inlineSearchClickOutside = function(e) {
            var searchContainer = document.getElementById('search-container');
            if (!searchContainer || searchContainer.style.display !== 'block') return;
            var header = document.getElementById('essay-header');
            var resultsContainer = document.getElementById('inline-search-results');

            if (header && resultsContainer &&
                !searchContainer.contains(e.target) &&
                !header.contains(e.target) &&
                !resultsContainer.contains(e.target)) {
                window.toggleSearchMode(false);
            }
        };
        document.addEventListener('click', window.inlineSearchClickOutside);
    }
    
    // Click delegation for results
    resultsContainer.addEventListener('click', function(e) {
        var item = e.target.closest('.search-result-item');
        if (!item) return;
        var href = item.getAttribute('data-href');
        if (!href) return;
        e.preventDefault();
        e.stopPropagation();
        window.toggleSearchMode(false);
        if (window.pjax) {
            window.pjax.loadUrl(href, { triggerElement: item });
        } else {
            window.location.href = href;
        }
    });

    // Search Hint Typewriter Logic
    var header = document.getElementById('essay-header');
    var searchHintWrapper = header ? header.querySelector('.search-hint-wrapper') : null;
    var searchHintText = searchHintWrapper ? searchHintWrapper.querySelector('.search-hint') : null;
    
    if (searchHintWrapper && searchHintText) {
        // --- Smart Greeting Logic ---
        var text = window.searchHintText || "点击随笔 开始搜索";
        var now = new Date();
        var month = now.getMonth() + 1;
        var day = now.getDate();
        var dateStr = (month < 10 ? '0' : '') + month + '-' + (day < 10 ? '0' : '') + day;
        var hour = now.getHours();

        // 1. Check Holidays
        if (window.searchHolidays && window.searchHolidays[dateStr]) {
            text = window.searchHolidays[dateStr];
        } 
        // 2. Check Time of Day (if greetings configured)
        else if (window.searchGreetings) {
            function pickGreeting(key) {
                var val = window.searchGreetings[key];
                if (!val) return null;
                if (Array.isArray(val)) return val[Math.floor(Math.random() * val.length)];
                return val;
            }
            var picked = null;
            if (hour >= 6 && hour < 11) picked = pickGreeting('morning');
            else if (hour >= 11 && hour < 14) picked = pickGreeting('noon');
            else if (hour >= 14 && hour < 18) picked = pickGreeting('afternoon');
            else if (hour >= 18 && hour < 22) picked = pickGreeting('evening');
            else if (hour >= 22 || hour < 6) picked = pickGreeting('night');
            if (picked) text = picked;
        }
        
        var typeInterval;
        var hideTimeout;

        function runTypewriter(str, callback) {
            if (typeInterval) clearInterval(typeInterval);
            if (hideTimeout) clearTimeout(hideTimeout);
            
            // Ensure visible
            searchHintWrapper.classList.add('visible');
            
            var i = 1;
            // Pre-fill first char
            if (str.length > 0) {
                searchHintText.textContent = str.charAt(0);
            }
            
            typeInterval = setInterval(function() {
                if (i >= str.length) {
                    clearInterval(typeInterval);
                    if (callback) callback();
                    return;
                }
                searchHintText.textContent = str.substring(0, i + 1);
                i++;
            }, 100);
        }

        // Check session storage for Jiaotailang tip
        if (!sessionStorage.getItem('jiaotailang_shown')) {
            // Initial Delay
            setTimeout(function() {
                // Step 1: Show Greeting
                runTypewriter(text, function() {
                    // Animation Finished
                    
                    // Step 2: Check Mobile Logic
                    if (window.isMobile && window.isMobile()) {
                        // Wait 2s then show secret hint
                        hideTimeout = setTimeout(function() {
                            var secretHint = "悄咪咪告诉你,点击随笔即可搜索";
                            runTypewriter(secretHint, function() {
                                // Finished secret hint
                                sessionStorage.setItem('jiaotailang_shown', 'true');
                                // Hide after 5s
                                hideTimeout = setTimeout(function() {
                                    searchHintWrapper.classList.remove('visible');
                                }, 5000);
                            });
                        }, 2000);
                    } else {
                        // Desktop: Just hide after 8s
                        sessionStorage.setItem('jiaotailang_shown', 'true');
                        hideTimeout = setTimeout(function() {
                            searchHintWrapper.classList.remove('visible');
                        }, 8000);
                    }
                });
            }, 500);
        } else {
            // If already shown, set full text but don't auto-show
            searchHintText.textContent = text;
        }

        // --- Hover Logic (Desktop) ---
        if (!window.isMobile || !window.isMobile()) {
            header.addEventListener('mouseenter', function() {
                // Stop any running animations
                if (typeInterval) clearInterval(typeInterval);
                if (hideTimeout) clearTimeout(hideTimeout);
                
                searchHintWrapper.classList.add('visible');
                searchHintText.textContent = "点击随笔，开始搜索";
            });

            header.addEventListener('mouseleave', function() {
                // Simply hide when leaving
                searchHintWrapper.classList.remove('visible');
                // Optional: Reset text to greeting in case it's shown again by some other logic?
                // But mostly it will be triggered by hover again.
            });
        }
    }
}