"use client";

import { clsx } from "clsx";
import { EstimateStatus, EstimateVersionStatus } from "@planarchy/shared";
import type {
  EstimateMetricView,
  EstimateVersionView,
  EstimateWorkspaceView,
} from "~/components/estimates/EstimateWorkspace.types.js";
import { InfoTooltip } from "~/components/ui/InfoTooltip.js";
import { formatDateLong, formatMoney } from "~/lib/format.js";

const STATUS_STYLES: Record<EstimateStatus, string> = {
  DRAFT: "bg-slate-100 text-slate-700 dark:bg-slate-900/30 dark:text-slate-300",
  IN_REVIEW: "bg-amber-100 text-amber-700 dark:bg-amber-900/30 dark:text-amber-300",
  APPROVED: "bg-emerald-100 text-emerald-700 dark:bg-emerald-900/30 dark:text-emerald-300",
  ARCHIVED: "bg-zinc-200 text-zinc-700 dark:bg-zinc-800 dark:text-zinc-300",
};

const VERSION_STYLES: Record<EstimateVersionStatus, string> = {
  WORKING: "bg-sky-100 text-sky-700 dark:bg-sky-900/30 dark:text-sky-300",
  BASELINE: "bg-violet-100 text-violet-700 dark:bg-violet-900/30 dark:text-violet-300",
  SUBMITTED: "bg-amber-100 text-amber-700 dark:bg-amber-900/30 dark:text-amber-300",
  APPROVED: "bg-emerald-100 text-emerald-700 dark:bg-emerald-900/30 dark:text-emerald-300",
  SUPERSEDED: "bg-zinc-200 text-zinc-700 dark:bg-zinc-800 dark:text-zinc-300",
};

function formatMetricValue(metric: EstimateMetricView) {
  if (metric.valueCents != null) {
    return formatMoney(metric.valueCents, metric.currency ?? "EUR");
  }
  if (metric.key === "margin_percent") {
    return `${metric.valueDecimal.toFixed(0)}%`;
  }
  return new Intl.NumberFormat("de-DE", { maximumFractionDigits: 1 }).format(metric.valueDecimal);
}

export function OverviewTab({ estimate }: { estimate: EstimateWorkspaceView }) {
  const versions = estimate.versions as EstimateVersionView[];
  const latestVersion = versions[0] ?? null;
  const latestMetrics = latestVersion?.metrics ?? [];

  return (
    <div className="grid gap-6 xl:grid-cols-[minmax(0,1.1fr),340px]">
      <section className="space-y-6">
        <div className="rounded-3xl border border-gray-200 dark:border-gray-700 bg-white dark:bg-gray-800 p-6 shadow-sm">
          <div className="flex flex-wrap items-center gap-2">
            <span className={clsx("rounded-full px-3 py-1 text-xs font-semibold", STATUS_STYLES[estimate.status])}>
              {estimate.status.replace("_", " ")}
            </span>
            {estimate.project && (
              <span className="rounded-full bg-gray-100 dark:bg-gray-800 px-3 py-1 text-xs font-medium text-gray-600 dark:text-gray-400">
                {estimate.project.shortCode}
              </span>
            )}
          </div>

          <div className="mt-5 grid gap-4 md:grid-cols-2">
            <div>
              <p className="text-xs uppercase tracking-wide text-gray-400">Opportunity <InfoTooltip content="External CRM or sales reference linking this estimate to a sales opportunity." /></p>
              <p className="mt-1 text-sm text-gray-800 dark:text-gray-200">{estimate.opportunityId ?? "Not set"}</p>
            </div>
            <div>
              <p className="text-xs uppercase tracking-wide text-gray-400">Base currency <InfoTooltip content="The primary currency for all monetary calculations in this estimate." /></p>
              <p className="mt-1 text-sm text-gray-800 dark:text-gray-200">{estimate.baseCurrency}</p>
            </div>
            <div>
              <p className="text-xs uppercase tracking-wide text-gray-400">Latest version <InfoTooltip content="The most recent version snapshot. Each version captures a full copy of scope, demand, and financials." /></p>
              <p className="mt-1 text-sm text-gray-800 dark:text-gray-200">
                {latestVersion ? `v${latestVersion.versionNumber}${latestVersion.label ? ` - ${latestVersion.label}` : ""}` : "No version"}
              </p>
            </div>
            <div>
              <p className="text-xs uppercase tracking-wide text-gray-400">Updated</p>
              <p className="mt-1 text-sm text-gray-800 dark:text-gray-200">{formatDateLong(estimate.updatedAt)}</p>
            </div>
          </div>

          {latestVersion?.notes && (
            <div className="mt-5 rounded-2xl border border-gray-100 dark:border-gray-700/50 bg-gray-50 dark:bg-gray-900 p-4">
              <p className="text-xs uppercase tracking-wide text-gray-400">Version notes</p>
              <p className="mt-2 text-sm text-gray-700 dark:text-gray-300">{latestVersion.notes}</p>
            </div>
          )}
        </div>

        <div className="grid gap-4 md:grid-cols-2">
          <div className="rounded-3xl border border-gray-200 dark:border-gray-700 bg-white dark:bg-gray-800 p-5 shadow-sm">
            <div className="flex items-center justify-between">
              <p className="text-sm font-semibold text-gray-900 dark:text-gray-100">Scope items <InfoTooltip content="Deliverables or work packages included in this estimate version." /></p>
              <span className="text-xs text-gray-400">{latestVersion?.scopeItems.length ?? 0}</span>
            </div>
            <div className="mt-4 space-y-2">
              {(latestVersion?.scopeItems ?? []).slice(0, 4).map((item) => (
                <div key={item.id} className="rounded-2xl border border-gray-100 dark:border-gray-700/50 px-4 py-3">
                  <div className="flex items-center justify-between gap-3">
                    <p className="text-sm font-medium text-gray-900 dark:text-gray-100">{item.name}</p>
                    <span className="text-xs text-gray-400">{item.scopeType}</span>
                  </div>
                </div>
              ))}
              {(latestVersion?.scopeItems.length ?? 0) === 0 && <p className="text-sm text-gray-400">No scope rows captured yet.</p>}
            </div>
          </div>

          <div className="rounded-3xl border border-gray-200 dark:border-gray-700 bg-white dark:bg-gray-800 p-5 shadow-sm">
            <div className="flex items-center justify-between">
              <p className="text-sm font-semibold text-gray-900 dark:text-gray-100">Demand lines <InfoTooltip content="Staffing demand rows with hours, cost rate, and sell rate per role or resource." /></p>
              <span className="text-xs text-gray-400">{latestVersion?.demandLines.length ?? 0}</span>
            </div>
            <div className="mt-4 space-y-2">
              {(latestVersion?.demandLines ?? []).slice(0, 4).map((line) => (
                <div key={line.id} className="rounded-2xl border border-gray-100 dark:border-gray-700/50 px-4 py-3">
                  <div className="flex items-center justify-between gap-3">
                    <p className="text-sm font-medium text-gray-900 dark:text-gray-100">{line.name}</p>
                    <span className="text-xs text-gray-500 dark:text-gray-400">{line.hours.toFixed(1)} h</span>
                  </div>
                </div>
              ))}
              {(latestVersion?.demandLines.length ?? 0) === 0 && <p className="text-sm text-gray-400">No demand lines captured yet.</p>}
            </div>
          </div>
        </div>
      </section>

      <aside className="space-y-4">
        <div className="rounded-3xl border border-gray-200 dark:border-gray-700 bg-white dark:bg-gray-800 p-5 shadow-sm">
          <p className="text-sm font-semibold text-gray-900 dark:text-gray-100">Summary metrics <InfoTooltip content="Key financial indicators derived from the latest version's demand lines." /></p>
          <div className="mt-4 space-y-3">
            {latestMetrics.length === 0 ? (
              <p className="text-sm text-gray-400">No derived metrics available yet.</p>
            ) : (
              latestMetrics.map((metric) => (
                <div key={metric.id} className="flex items-center justify-between gap-3 rounded-2xl bg-gray-50 dark:bg-gray-900 px-4 py-3">
                  <span className="text-xs uppercase tracking-wide text-gray-400">{metric.label}</span>
                  <span className="text-sm font-semibold text-gray-900 dark:text-gray-100">{formatMetricValue(metric)}</span>
                </div>
              ))
            )}
          </div>
        </div>

        <div className="rounded-3xl border border-gray-200 dark:border-gray-700 bg-white dark:bg-gray-800 p-5 shadow-sm">
          <p className="text-sm font-semibold text-gray-900 dark:text-gray-100">Version context <InfoTooltip content="Metadata about the latest version, including its workflow status and linked records." /></p>
          <div className="mt-4 space-y-3">
            {latestVersion ? (
              <>
                <div className="flex items-center justify-between gap-3">
                  <span className="text-sm text-gray-500 dark:text-gray-400">Status</span>
                  <span className={clsx("rounded-full px-2.5 py-1 text-xs font-medium", VERSION_STYLES[latestVersion.status])}>
                    {latestVersion.status}
                  </span>
                </div>
                <div className="flex items-center justify-between gap-3">
                  <span className="text-sm text-gray-500 dark:text-gray-400">Assumptions</span>
                  <span className="text-sm font-medium text-gray-900 dark:text-gray-100">{latestVersion.assumptions.length}</span>
                </div>
                <div className="flex items-center justify-between gap-3">
                  <span className="text-sm text-gray-500 dark:text-gray-400">Snapshots</span>
                  <span className="text-sm font-medium text-gray-900 dark:text-gray-100">{latestVersion.resourceSnapshots.length}</span>
                </div>
                <div className="flex items-center justify-between gap-3">
                  <span className="text-sm text-gray-500 dark:text-gray-400">Exports</span>
                  <span className="text-sm font-medium text-gray-900 dark:text-gray-100">{latestVersion.exports.length}</span>
                </div>
              </>
            ) : (
              <p className="text-sm text-gray-400">No version available.</p>
            )}
          </div>
        </div>
      </aside>
    </div>
  );
}
