document.addEventListener('DOMContentLoaded', function() {
    function geocode(query, callback) {
        fetch('https://nominatim.openstreetmap.org/search?format=json&q=' + encodeURIComponent(query))
            .then(response => response.json())
            .then(data => {
                if (data && data.length > 0) {
                    callback(data[0]);
                } else {
                    callback(null);
                }
            });
    }

    function setInputToCurrentLocation(inputId) {
        if (navigator.geolocation) {
            navigator.geolocation.getCurrentPosition(function(position) {
                var lat = position.coords.latitude;
                var lon = position.coords.longitude;
                fetch(`https://nominatim.openstreetmap.org/reverse?format=json&lat=${lat}&lon=${lon}`)
                    .then(response => response.json())
                    .then(data => {
                        document.getElementById(inputId).value = data.display_name || `${lat},${lon}`;
                        document.getElementById(inputId).dataset.lat = lat;
                        document.getElementById(inputId).dataset.lon = lon;
                    });
            });
        }
    }

    function showSuggestions(inputId, suggestionsId, value) {
        var suggestionsBox = document.getElementById(suggestionsId);
        if (!value) {
            suggestionsBox.innerHTML = '';
            suggestionsBox.style.display = 'none';
            return;
        }
        fetch('https://nominatim.openstreetmap.org/search?format=json&q=' + encodeURIComponent(value))
            .then(response => response.json())
            .then(data => {
                suggestionsBox.innerHTML = '';
                if (data && data.length > 0) {
                    data.slice(0, 5).forEach(function(item) {
                        var option = document.createElement('button');
                        option.type = 'button';
                        option.className = 'list-group-item list-group-item-action';
                        option.textContent = item.display_name;
                        option.onclick = function() {
                            var input = document.getElementById(inputId);
                            input.value = item.display_name;
                            input.dataset.lat = item.lat;
                            input.dataset.lon = item.lon;
                            suggestionsBox.innerHTML = '';
                            suggestionsBox.style.display = 'none';
                        };
                        suggestionsBox.appendChild(option);
                    });
                    suggestionsBox.style.display = 'block';
                } else {
                    suggestionsBox.style.display = 'none';
                }
            });
    }

    // Debounce helper
    function debounce(fn, delay) {
        let timer = null;
        return function(...args) {
            clearTimeout(timer);
            timer = setTimeout(() => fn.apply(this, args), delay);
        };
    }

    function handleInput(e) {
        var val = e.target.value;
        if (val) {
            geocode(val, function(result) {
                if (result) {
                    e.target.dataset.lat = result.lat;
                    e.target.dataset.lon = result.lon;
                } else {
                    delete e.target.dataset.lat;
                    delete e.target.dataset.lon;
                }
            });
        } else {
            delete e.target.dataset.lat;
            delete e.target.dataset.lon;
        }
    }

    document.getElementById('sourceInput').addEventListener('input', debounce(function(e) {
        showSuggestions('sourceInput', 'sourceSuggestions', e.target.value);
    }, 400));
    document.getElementById('destInput').addEventListener('input', debounce(function(e) {
        showSuggestions('destInput', 'destSuggestions', e.target.value);
    }, 400));

    // Hide suggestions when input loses focus (with a slight delay for click)
    document.getElementById('sourceInput').addEventListener('blur', function() {
        setTimeout(() => {
            document.getElementById('sourceSuggestions').style.display = 'none';
        }, 200);
    });
    document.getElementById('destInput').addEventListener('blur', function() {
        setTimeout(() => {
            document.getElementById('destSuggestions').style.display = 'none';
        }, 200);
    });

    document.getElementById('useCurrentSource').onclick = function() {
        setInputToCurrentLocation('sourceInput');
    };
    document.getElementById('useCurrentDest').onclick = function() {
        setInputToCurrentLocation('destInput');
    };

    document.getElementById('sourceInput').addEventListener('blur', function(e) {
        var val = e.target.value;
        if (val && !e.target.dataset.lat) {
            geocode(val, function(result) {
                if (result) {
                    e.target.dataset.lat = result.lat;
                    e.target.dataset.lon = result.lon;
                }
            });
        }
    });
    document.getElementById('destInput').addEventListener('blur', function(e) {
        var val = e.target.value;
        if (val && !e.target.dataset.lat) {
            geocode(val, function(result) {
                if (result) {
                    e.target.dataset.lat = result.lat;
                    e.target.dataset.lon = result.lon;
                }
            });
        }
    });
});