/**
 * message-filter.ts — outgoing message sanitization
 *
 * 1. Brand replace: OpenClaw → Titan, openclaw emoji → 🐶
 * 2. Path scrub: strip /home/openclaw/ prefix from tool content
 * 3. Smart truncation: single truncator
 *    - SQL results: row count summary + first N lines
 *    - Other: first 400 chars + …[N more chars]
 */

// ── 1. Brand replace ────────────────────────────────────────────────────────

const OPENCLAW_EMOJIS = /🐾|🦞|🤖|🦅/gu;
const OPENCLAW_NAME   = /\bOpenClaw\b/g;

function brandReplace(str: string): string {
    return str.replace(OPENCLAW_EMOJIS, '🐶').replace(OPENCLAW_NAME, 'Titan');
}

// ── 2. Path scrub ────────────────────────────────────────────────────────────

const PATH_ABS      = /\/home\/openclaw\//g;
const PATH_TILDE    = /~\/\.openclaw\//g;
const PATH_DOT_CLAW = /\.openclaw\//g;

function scrubPaths(str: string): string {
    return str.replace(PATH_ABS, '').replace(PATH_TILDE, '').replace(PATH_DOT_CLAW, '');
}

// ── 3. Smart truncation ──────────────────────────────────────────────────────

const SOFT_LIMIT = 80;
const SQL_ROWS   = 8;

function looksLikeSqlResult(str: string): boolean {
    const lines = str.split('\n').filter(l => l.trim());
    if (lines.length < 2) return false;
    const tabLines = lines.filter(l => l.includes('\t') || (l.match(/\|/g) || []).length >= 2);
    return tabLines.length > lines.length * 0.5;
}

function truncateSql(str: string): string {
    const lines = str.split('\n').filter(l => l.trim());
    const total = lines.length;
    if (total <= SQL_ROWS + 1) return str;
    return lines.slice(0, SQL_ROWS).join('\n') + `\n… [${total - SQL_ROWS} more rows]`;
}

function smartTruncate(str: unknown): string {
    if (typeof str !== 'string') {
        try { str = JSON.stringify(str); } catch (_) { return String(str); }
    }
    const s = str as string;
    if (s.length <= SOFT_LIMIT) return s;
    if (looksLikeSqlResult(s)) return truncateSql(s);
    return s.slice(0, 40) + '…' + s.slice(-40);
}

// ── Public API ───────────────────────────────────────────────────────────────

export function filterText(str: string | null | undefined): string | null | undefined {
    if (str == null) return str;
    return scrubPaths(brandReplace(String(str)));
}

function extractSql(cmd: string): string | null {
    const m = cmd.match(/(?:mysql|mariadb)\b[^"']*-e\s+["']([^"']+)["']/s);
    if (m) return m[1].trim().replace(/\\`/g, '').replace(/`/g, '');
    return null;
}

function prettifyArgs(val: unknown): string {
    if (typeof val === 'string') {
        try { val = JSON.parse(val); } catch (_) { return val; }
    }
    if (val && typeof val === 'object') {
        const obj = val as Record<string, unknown>;
        if (typeof obj.command === 'string') {
            return extractSql(obj.command) || obj.command;
        }
        const keys = Object.keys(obj);
        if (keys.length === 1 && typeof obj[keys[0]] === 'string') return obj[keys[0]] as string;
        try { return JSON.stringify(val); } catch (_) { return '[non-serializable]'; }
    }
    return String(val);
}

export function filterValue(val: unknown): string | null | undefined {
    if (val == null) return val as null | undefined;
    return smartTruncate(scrubPaths(brandReplace(prettifyArgs(val))));
}

export { brandReplace, scrubPaths, smartTruncate };