import type { MessageRow } from "./types.ts";

export function clamp(value: number, min: number, max: number) { return Math.min(max, Math.max(min, value)); }

export function isoInWindow(value: string, start: string, end: string) { if (!value) return false; if (!start && !end) return false; if (start && value < start) return false; if (end && value > end) return false; return true; }

export function parseJsonSafe(rawText: string) { try { return JSON.parse(rawText); } catch { return null; } }

export function parseJsonObjectFromText(rawText: string) { const value = String(rawText || "").trim(); if (!value) return null; const direct = parseJsonSafe(value); if (direct && typeof direct === "object" && !Array.isArray(direct)) return direct; const firstBrace = value.indexOf("{"); const lastBrace = value.lastIndexOf("}"); if (firstBrace < 0 || lastBrace <= firstBrace) return null; const sliced = value.slice(firstBrace, lastBrace + 1); const parsed = parseJsonSafe(sliced); if (parsed && typeof parsed === "object" && !Array.isArray(parsed)) return parsed; return null; }

export function stableNumber(value: unknown, fallback = 0) { const parsed = Number(value); return Number.isFinite(parsed) ? parsed : fallback; }

export function toRecentMessagesDesc(history: MessageRow[], maxItems: number) { const bounded = Math.max(1, Math.floor(maxItems) || 1); return history.slice(-bounded).slice().reverse(); }

export function truncateText(value: string, maxChars: number) { const text = String(value || ""); if (text.length <= maxChars) return text; return ${text.slice(0, Math.max(1, maxChars - 3))}...; }

export function formatPct(numerator: number, denominator: number) { if (denominator <= 0) return 0; return (100 * numerator) / denominator; }

export function computeContextSince(since: string, historyLookbackHours: number) { const sinceMs = Date.parse(since); const lookbackMs = Math.max(0, Math.floor(Number(historyLookbackHours) || 0)) * 60 * 60 * 1000; if (!Number.isFinite(sinceMs) || sinceMs <= 0) return since; return new Date(Math.max(0, sinceMs - lookbackMs)).toISOString(); }