// Shared modal overlay utility (extracted from Sidebar.js in H4 4.0).
// Builds a single `#app-modal-overlay` over the app, stopping propagation so
// inputs/clicks inside the modal never reach the 3D controls.

/** @typedef {import('../types.js').ModalOptions} ModalOptions */

/**
 * Show a custom modal overlay. Replaces any existing overlay.
 * @param {ModalOptions} options
 * @returns {void}
 */
export function showCustomModal({ title, contentHTML, onConfirm, onCancel, confirmText = "Confirm", cancelText = "Cancel", isAlert = false }) {
    // Clean old modal overlays
    const oldOverlay = document.getElementById('app-modal-overlay');
    if (oldOverlay) oldOverlay.remove();

    const overlay = document.createElement('div');
    overlay.id = 'app-modal-overlay';
    overlay.className = 'modal-overlay';
    document.body.appendChild(overlay);

    overlay.innerHTML = `
        <div class="modal-content app-panel">
            <div class="modal-header">
                <span class="modal-title">${title}</span>
                ${isAlert ? '<button id="modal-close-x" class="btn btn-secondary btn-square" style="width:24px; height:24px; min-height:24px; padding:0; font-size:10px; border-radius:50%;">✕</button>' : ''}
            </div>
            <div class="modal-body">
                ${contentHTML}
            </div>
            <div class="modal-actions">
                ${!isAlert ? `<button id="modal-cancel-btn" class="btn btn-secondary">${cancelText}</button>` : ''}
                <button id="modal-confirm-btn" class="btn btn-primary">${confirmText}</button>
            </div>
        </div>
    `;

    // Prevent propagation so inputs/clicks inside modal don't affect 3D controls
    ['mousedown', 'click', 'keydown', 'keyup'].forEach(evt => {
        overlay.addEventListener(evt, (e) => e.stopPropagation());
    });

    const closeOverlay = () => {
        overlay.classList.remove('active');
        setTimeout(() => overlay.remove(), 300);
    };

    const confirmBtn = overlay.querySelector('#modal-confirm-btn');
    if (confirmBtn) {
        confirmBtn.onclick = () => {
            if (onConfirm) onConfirm(overlay);
            closeOverlay();
        };
    }

    const cancelBtn = overlay.querySelector('#modal-cancel-btn');
    if (cancelBtn) {
        cancelBtn.onclick = () => {
            if (onCancel) onCancel();
            closeOverlay();
        };
    }

    const closeX = overlay.querySelector('#modal-close-x');
    if (closeX) {
        closeX.onclick = () => {
            if (onCancel) onCancel();
            closeOverlay();
        };
    }

    // Force reflow and activate transition
    overlay.offsetHeight;
    overlay.classList.add('active');
}

/**
 * Open the bookmark naming modal and lock/unlock PointerLock camera flight controls.
 * @param {{ docId: string, chunkIndex: number, dimensionIndex: number, value: number }} coordinates
 * @param {function(string): void} callback
 * @param {object} [controls]
 * @returns {void}
 */
export function showBookmarkNamingModal(coordinates, callback, controls = null) {
    if (controls && controls.isLocked) {
        controls.unlock();
    }

    const valStr = typeof coordinates.value === 'number' ? coordinates.value.toFixed(4) : coordinates.value;

    const contentHTML = `
        <div style="display:flex; flex-direction:column; gap: var(--spacing-sm); width: 100%; max-width: 420px; font-family: var(--font-sans);">
            <p style="font-size: var(--font-size-small); color: var(--color-neutral-300); margin: 0; line-height: 1.5;">
                Bookmark: Document <strong>${coordinates.docId}</strong> · Chunk <strong>${coordinates.chunkIndex}</strong> · Dimension <strong>${coordinates.dimensionIndex}</strong> (Value: <strong>${valStr}</strong>)
            </p>
            <div style="display:flex; flex-direction:column; gap: 4px; margin-top: var(--spacing-xs);">
                <label for="bookmark-name-input" style="font-size: var(--font-size-caption); color: var(--color-neutral-400);">Bookmark name:</label>
                <input id="bookmark-name-input" class="input-field" type="text" placeholder="e.g. Attention peak" style="width: 100%; border: 1px solid oklch(from var(--color-neutral-50) l c h / 0.1); background: oklch(from var(--color-neutral-950) l c h / 0.5); color: var(--color-neutral-50); padding: var(--spacing-xs); border-radius: 4px;">
            </div>
        </div>
    `;

    showCustomModal({
        title: "New Bookmark",
        contentHTML: contentHTML,
        confirmText: "Save",
        cancelText: "Cancel",
        onConfirm: () => {
            // Handled by custom validation below
        },
        onCancel: () => {
            if (controls) {
                controls.lock();
            }
        }
    });

    // Custom validation: override confirmBtn.onclick to prevent closing if input is empty
    const overlay = document.getElementById('app-modal-overlay');
    if (overlay) {
        const confirmBtn = overlay.querySelector('#modal-confirm-btn');
        const input = overlay.querySelector('#bookmark-name-input');
        if (confirmBtn && input) {
            confirmBtn.onclick = () => {
                const name = input.value.trim();
                if (!name) {
                    input.style.borderColor = 'var(--color-semantic-error)';
                    input.focus();
                    return; // Prevent closing
                }
                callback(name);
                // Destroy the modal
                overlay.classList.remove('active');
                setTimeout(() => overlay.remove(), 300);

                // Restore flight controls
                if (controls) {
                    controls.lock();
                }
            };
        }

        // Focus the input field automatically
        setTimeout(() => {
            if (input) {
                input.focus();
                input.select();
            }
        }, 50);
    }
}