document.addEventListener('DOMContentLoaded', () => {
    const searchInput = document.getElementById('search-input');
    const searchForm = document.getElementById('search-form');

    if (searchInput && searchForm) {
        const performSearch = async (e) => {
            if (e) e.preventDefault();
            const query = searchInput.value.trim();
            if (!query) return;

            const qLower = query.toLowerCase();
            let publicNotes = [];
            let privateNotes = [];

            // 1. Search Public Notes (Backend)
            try {
                const res = await fetch(`/api/search?q=${encodeURIComponent(query)}`);
                if (res.ok) {
                    publicNotes = await res.json();
                } else {
                    console.error("Search API failed:", res.status);
                }
            } catch (e) {
                console.error("Search error:", e);
            }

            // 2. Search Private Notes (Client-Side Decryption for Zero-Knowledge Privacy)
            if (window.SpotNotes && window.SpotNotes.isLoggedIn) {
                try {
                    const mineRes = await fetch('/api/notes/mine');
                    if (mineRes.ok) {
                        const myRawNotes = await mineRes.json();
                        for (const note of myRawNotes) {
                            let decryptedNote = note;
                            if (note.is_encrypted && window.SpotCrypto) {
                                let padKey = window.SpotCrypto.getCachedPadKey(note.notepad_id);
                                if (!padKey && note.notepad && note.notepad.encrypted_key) {
                                    padKey = await window.SpotCrypto.unwrapNotepadKey(note.notepad_id, note.notepad.encrypted_key);
                                }
                                decryptedNote = await window.SpotCrypto.decryptNote(note, padKey);
                            }

                            const titleMatch = (decryptedNote.title || '').toLowerCase().includes(qLower);
                            const contentMatch = (decryptedNote.content || '').toLowerCase().includes(qLower);

                            if (titleMatch || contentMatch) {
                                privateNotes.push(decryptedNote);
                            }
                        }
                    }
                } catch (e) {
                    console.warn("Error searching private notes locally:", e);
                }
            }

            // Combine unique notes
            const seenIds = new Set();
            const combinedNotes = [];
            [...privateNotes, ...publicNotes].forEach(note => {
                if (!seenIds.has(note.id)) {
                    seenIds.add(note.id);
                    combinedNotes.push(note);
                }
            });

            // If notes found, display them
            if (combinedNotes.length > 0) {
                if (window.SpotNotes && window.SpotNotes.displaySearchResults) {
                    window.SpotNotes.displaySearchResults(combinedNotes, null, query);
                }
                return;
            }

            // 3. Fallback: Search Location (Nominatim) if no notes found
            let location = null;
            try {
                const nomRes = await fetch(`/api/geocode?q=${encodeURIComponent(query)}`);
                const nomData = await nomRes.json();
                if (nomData && nomData.length > 0) {
                    location = {
                        lat: parseFloat(nomData[0].lat),
                        lng: parseFloat(nomData[0].lon)
                    };
                }
            } catch (e) {
                console.error("Geocoding error:", e);
            }

            // 4. Update UI
            if (window.SpotNotes && window.SpotNotes.displaySearchResults) {
                window.SpotNotes.displaySearchResults(combinedNotes, location, query);
            }
        };

        searchForm.addEventListener('submit', performSearch);
    }
});