/**
 * Removes a redirect path
 *
 * This function deletes a route (redirect) by its ID or path.
 * It prevents deletion of the canonical path (where route.id === document.path_id)
 * to ensure every document always has at least one accessible path.
 *
 * @param client Database client
 * @param query Redirect query (redirect id number, redirect path string, or objects with {id} or {path})
 * @returns True if redirect was deleted, false if not found or is canonical path
 * @throws Error if attempting to delete canonical path
 */
export const removeRedirect = async (client, query) => {
    // Validate redirect query
    if (query === null || query === undefined || query === '') {
        throw new Error('Invalid redirect path');
    }
    // Normalize query to get redirectId or redirectPath
    let redirectId;
    let redirectPath;
    if (typeof query === 'number') {
        redirectId = query;
    }
    else if (typeof query === 'string') {
        redirectPath = query;
    }
    else if ('id' in query && typeof query.id === 'number') {
        redirectId = query.id;
    }
    else if ('path' in query && typeof query.path === 'string') {
        redirectPath = query.path;
    }
    else {
        throw new Error('Invalid RedirectQuery format');
    }
    // First, find the route to check if it's canonical
    let routeQuery;
    let routeParams;
    if (redirectId !== undefined) {
        routeQuery = 'SELECT id, document_id FROM routes WHERE id = $1';
        routeParams = [redirectId];
    }
    else {
        // redirectPath is guaranteed to be defined here due to validation above
        routeQuery = 'SELECT id, document_id FROM routes WHERE path = $1';
        routeParams = [redirectPath];
    }
    const routeResult = await client.query(routeQuery, routeParams);
    if (routeResult.rows.length === 0) {
        return false;
    }
    const route = routeResult.rows[0];
    const actualRedirectId = route.id;
    const documentId = route.document_id;
    // Get the document's canonical path_id to prevent deletion
    const docResult = await client.query('SELECT path_id FROM documents WHERE id = $1', [documentId]);
    /* node:coverage disable */
    if (docResult.rows.length === 0) {
        return false;
    }
    /* node:coverage enable */
    const { path_id } = docResult.rows[0];
    // Prevent deletion of canonical path
    if (actualRedirectId === path_id) {
        throw new Error('Cannot delete canonical path. Use upsert to change the document path instead.');
    }
    // Delete the redirect
    const result = await client.query('DELETE FROM routes WHERE id = $1', [actualRedirectId]);
    return result.rowCount !== null && result.rowCount > 0;
};
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