import { CheckCircle2, FileText, XCircle } from "lucide-react";
import type { CompletionDocStateConfig, DocState } from "@/domain/work-orders/types/completion-doc";
import type { CompletionDocStatus } from "@/domain/work-orders/types/work-order-table-row";

const MONTH_NAMES = [
  "January",
  "February",
  "March",
  "April",
  "May",
  "June",
  "July",
  "August",
  "September",
  "October",
  "November",
  "December",
];

function pad2(n: number): string {
  return String(n).padStart(2, "0");
}

export function docStateOf(status: CompletionDocStatus): DocState {
  return status === "Yes" ? "generated" : status === "NN" ? "not-required" : "draft";
}

export function fmtDocNow(): string {
  const d = new Date();
  let h = d.getHours();
  const ap = h >= 12 ? "PM" : "AM";
  h = h % 12 || 12;
  return `${MONTH_NAMES[d.getMonth()].slice(0, 3)} ${d.getDate()}, ${d.getFullYear()} · ${h}:${pad2(d.getMinutes())} ${ap}`;
}

export const DOC_STATE_CFG: Record<DocState, CompletionDocStateConfig> = {
  draft: {
    pillLabel: "Draft — not generated",
    pillBg: "var(--color-bg-muted)",
    pillText: "var(--muted-foreground)",
    cardBg: "var(--color-bg-muted)",
    cardBorder: "var(--color-border)",
    cardIconBg: "var(--color-bg-surface)",
    iconColor: "var(--muted-foreground)",
    cardTitle: "Draft — not generated",
    icon: FileText,
  },
  generated: {
    pillLabel: "Generated",
    pillBg: "var(--doc-yes-bg)",
    pillText: "var(--color-success)",
    cardBg: "var(--doc-yes-bg)",
    cardBorder: "#bbf7d0",
    cardIconBg: "var(--color-bg-surface)",
    iconColor: "var(--color-success)",
    cardTitle: "Generated",
    icon: CheckCircle2,
  },
  "not-required": {
    pillLabel: "Not required",
    pillBg: "var(--indicator-co-1-bg)",
    pillText: "var(--warning)",
    cardBg: "var(--indicator-co-1-bg)",
    cardBorder: "#fde68a",
    cardIconBg: "var(--color-bg-surface)",
    iconColor: "var(--warning)",
    cardTitle: "Not required",
    icon: XCircle,
  },
};

export function docStatusCardDescription(state: DocState, generatedAt: string): string {
  if (state === "draft") {
    return "This document hasn't been generated yet. Add any extra details, then generate it — or mark it as not required.";
  }
  if (state === "generated") {
    return `Ready to download or share. Generated ${generatedAt}.`;
  }
  return "No document is required for this work order. You can undo this anytime.";
}