"use client";

import Link from "next/link";
import { useEffect, useState } from "react";
import {
  getDemoOnboardingState,
  updateDemoOnboardingState,
} from "@/lib/demo-session-store";
import type { OnboardingState } from "@/lib/onboarding-shared";

type OptionalFlowShellProps = {
  kicker: string;
  title: string;
  description: string;
  bullets: string[];
  completeField: "completeActionPlan" | "completeAutodiagnostic";
  completionStatus: "actionPlan" | "autodiagnostic";
  completeLabel: string;
};

async function fetchOnboardingState() {
  return getDemoOnboardingState();
}

async function markFlowAsComplete(
  completeField: OptionalFlowShellProps["completeField"],
) {
  return updateDemoOnboardingState({
    [completeField]: true,
  });
}

export function OptionalFlowShell({
  kicker,
  title,
  description,
  bullets,
  completeField,
  completionStatus,
  completeLabel,
}: OptionalFlowShellProps) {
  const [status, setStatus] = useState<OnboardingState | null>(null);
  const [loading, setLoading] = useState(true);
  const [saving, setSaving] = useState(false);
  const [error, setError] = useState<string | null>(null);

  useEffect(() => {
    let active = true;

    async function load() {
      try {
        const nextState = await fetchOnboardingState();

        if (active) {
          setStatus(nextState);
        }
      } catch (caughtError) {
        if (active) {
          setError(
            caughtError instanceof Error
              ? caughtError.message
              : "Impossible de charger cette etape.",
          );
        }
      } finally {
        if (active) {
          setLoading(false);
        }
      }
    }

    void load();

    return () => {
      active = false;
    };
  }, []);

  const completed = status
    ? completionStatus === "actionPlan"
      ? status.actionPlanCompleted
      : status.autodiagnosticCompleted
    : false;

  async function handleComplete() {
    if (completed || saving) {
      return;
    }

    setSaving(true);
    setError(null);

    try {
      const nextState = await markFlowAsComplete(completeField);
      setStatus(nextState);
    } catch (caughtError) {
      setError(
        caughtError instanceof Error
          ? caughtError.message
          : "Impossible de mettre a jour cette etape.",
      );
    } finally {
      setSaving(false);
    }
  }

  if (loading) {
    return (
      <main className="app-shell min-h-screen px-5 py-8 sm:px-8 lg:px-10">
        <div className="relative z-10 mx-auto flex min-h-[80vh] max-w-4xl items-center justify-center">
          <div className="glass-card w-full max-w-2xl rounded-[32px] px-8 py-10 text-center">
            <p className="text-sm font-semibold uppercase tracking-[0.22em] text-[var(--primary)]">
              {kicker}
            </p>
            <h1 className="mt-4 text-3xl font-extrabold text-[var(--ink)]">
              Chargement...
            </h1>
          </div>
        </div>
      </main>
    );
  }

  return (
    <main className="app-shell min-h-screen px-5 py-8 sm:px-8 lg:px-10">
      <div className="relative z-10 mx-auto grid max-w-6xl gap-6 lg:grid-cols-[minmax(0,1fr)_320px]">
        <section className="glass-card fade-in-up rounded-[32px] px-6 py-6 lg:px-8 lg:py-8">
          <p className="text-sm font-semibold uppercase tracking-[0.22em] text-[var(--accent-red)]">
            {kicker}
          </p>
          <h1 className="mt-4 text-4xl font-extrabold tracking-[-0.04em] text-[var(--ink)]">
            {title}
          </h1>
          <p className="mt-4 max-w-3xl text-base leading-8 text-[var(--foreground)]">
            {description}
          </p>

          <div className="mt-8 grid gap-4 md:grid-cols-3">
            {bullets.map((bullet, index) => (
              <article
                key={bullet}
                className="rounded-[24px] border border-[var(--line)] bg-[var(--surface-soft)] p-5"
                style={{ animationDelay: `${index * 70}ms` }}
              >
                <p className="text-xs font-semibold uppercase tracking-[0.18em] text-[var(--primary)]">
                  Mock {index + 1}
                </p>
                <p className="mt-3 text-sm leading-7 text-[var(--foreground)]">
                  {bullet}
                </p>
              </article>
            ))}
          </div>

          {error ? (
            <div className="mt-6 rounded-[24px] border border-[rgba(159,25,24,0.16)] bg-[rgba(159,25,24,0.06)] px-4 py-3 text-sm leading-7 text-[var(--accent-red)]">
              {error}
            </div>
          ) : null}

          <div className="mt-8 flex flex-col gap-3 sm:flex-row">
            <button
              type="button"
              onClick={handleComplete}
              disabled={completed || saving}
              className="inline-flex items-center justify-center rounded-full bg-[var(--primary)] px-6 py-3 text-sm font-semibold text-white transition-colors hover:bg-[var(--primary-strong)] disabled:cursor-not-allowed disabled:opacity-60"
            >
              {completed
                ? "Etape deja complete"
                : saving
                  ? "Enregistrement..."
                  : completeLabel}
            </button>
            <Link
              href="/"
              className="inline-flex items-center justify-center rounded-full border border-[var(--line)] px-6 py-3 text-sm font-semibold text-[var(--foreground)] transition-colors hover:border-[var(--primary)] hover:text-[var(--primary)]"
            >
              Passer a l&apos;interface principale
            </Link>
            <Link
              href="/onboarding"
              className="inline-flex items-center justify-center rounded-full border border-[var(--line)] px-6 py-3 text-sm font-semibold text-[var(--foreground)] transition-colors hover:border-[var(--accent-gold)] hover:text-[var(--accent-gold)]"
            >
              Retour a l&apos;onboarding
            </Link>
          </div>
        </section>

        <aside className="glass-card fade-in-up rounded-[32px] p-6 lg:sticky lg:top-6 lg:h-fit">
          <p className="text-sm font-semibold uppercase tracking-[0.2em] text-[var(--accent-gold)]">
            Progression
          </p>
          <h2 className="mt-3 text-3xl font-extrabold tracking-[-0.04em] text-[var(--ink)]">
            Etat des etapes
          </h2>

          <div className="mt-6 rounded-[24px] border border-[var(--line)] bg-[var(--surface-soft)] p-4">
            <ul className="space-y-2 text-sm leading-7 text-[var(--foreground)]">
              <li>
                Onboarding{" "}
                {status?.onboardingCompleted ? "complete" : "en attente"}
              </li>
              <li>
                Plan d&apos;action{" "}
                {status?.actionPlanCompleted ? "complete" : "non complete"}
              </li>
              <li>
                Autodiagnostique{" "}
                {status?.autodiagnosticCompleted ? "complete" : "non complete"}
              </li>
            </ul>
          </div>
        </aside>
      </div>
    </main>
  );
}