"use client";

import { useRouter } from "next/navigation";
import { Sparkles, Check } from "lucide-react";
import { Button } from "@/components/ui/button";
import {
  Dialog,
  DialogContent,
  DialogHeader,
  DialogTitle,
  DialogDescription,
  DialogFooter,
} from "@/components/ui/dialog";

// Marketing copy per feature — kept client-side (not sourced from
// lib/feature-flags.ts's FEATURE_DEFINITIONS) since that module pulls in
// the DB client for server-only helpers and can't be bundled for the
// browser. Falls back to a generic pitch for any key not listed here.
const FEATURE_COPY: Record<string, { tagline: string; bullets: string[] }> = {
  recipe_variations: {
    tagline: "Get AI-generated twists on any recipe you save — dietary swaps, flavor changes, or a whole new spin — without starting from scratch.",
    bullets: [
      "Dietary swaps (vegan, gluten-free, dairy-free, and more)",
      "Flavor variations generated from your existing recipe",
      "Saved as a new recipe, linked back to the original",
    ],
  },
  drink_pairing: {
    tagline: "Never wonder what to serve alongside dinner again — get drink pairings suggested for any dish.",
    bullets: [
      "Wine, beer, cocktail, and non-alcoholic suggestions",
      "Tailored to the specific dish, not generic pairing charts",
      "Explains why each pairing works",
    ],
  },
  meal_pairing: {
    tagline: "Turn a single recipe into a full meal — get side dish, salad, and sauce suggestions that actually complement it.",
    bullets: [
      "Starters, sides, salads, breads, and sauces suggested per dish",
      "One click to generate and save any suggestion as its own recipe",
      "Pick multiple pairings and generate them all at once",
    ],
  },
  recipe_import_url: {
    tagline: "Stop retyping recipes from other sites — paste a link and get a fully structured recipe in seconds.",
    bullets: [
      "Works with most recipe blogs and sites",
      "Extracts ingredients, steps, servings, and timing automatically",
      "Edit anything before saving",
    ],
  },
  recipe_import_photo: {
    tagline: "Digitize a cookbook page or handwritten family recipe just by photographing it.",
    bullets: [
      "Recognizes printed or handwritten recipes",
      "Extracts ingredients and steps automatically",
      "Saved as a private, editable recipe",
    ],
  },
  nutrition_estimation: {
    tagline: "Know what's in every dish — get calorie and macro estimates for any recipe, no manual entry required.",
    bullets: [
      "Calories, protein, carbs, fat, fiber, and sodium per serving",
      "Combines AI estimation with USDA reference data",
      "Powers your weekly nutrition rollup on the meal plan",
    ],
  },
  markdown_export: {
    tagline: "Take your recipes, meal plans, and shopping lists anywhere — export clean Markdown you can paste into any note app.",
    bullets: [
      "Works on recipes, collections, meal plans, and pantry lists",
      "Copy to clipboard or download as a .md file",
      "Clean formatting, no app lock-in",
    ],
  },
  weekly_nutrition: {
    tagline: "See how your whole week stacks up against your nutrition goals, not just one meal at a time.",
    bullets: [
      "Daily average calories and macros across your meal plan week",
      "Compared directly against your saved nutrition goals",
      "Flags days with missing nutrition data",
    ],
  },
  version_history: {
    tagline: "Never lose a good version of a recipe — every edit is saved, so you can compare or roll back anytime.",
    bullets: [
      "Every save keeps a full snapshot of the prior version",
      "Side-by-side diff view to see exactly what changed",
      "Restore any past version with one click",
    ],
  },
  grocery_delivery: {
    tagline: "Skip the manual shopping trip — send your list straight to a grocery delivery provider.",
    bullets: [
      "One click from your shopping list to checkout",
      "Keeps quantities and aisle grouping intact",
      "No re-typing your list into another app",
    ],
  },
};

export function UpgradeDialog({
  open,
  onOpenChange,
  featureKey,
  featureLabel,
}: {
  open: boolean;
  onOpenChange: (open: boolean) => void;
  featureKey: string;
  featureLabel: string;
}) {
  const copy = FEATURE_COPY[featureKey];
  const router = useRouter();

  function handleUpgradeClick() {
    // keepalive lets this best-effort beacon survive the navigation that
    // follows immediately after — a plain fetch would otherwise risk being
    // aborted mid-flight by the router.push below.
    fetch("/api/v1/users/me/upgrade-interest", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ featureKey }),
      keepalive: true,
    }).catch(() => {});
    onOpenChange(false);
    router.push(`/settings/billing?upgrade=${encodeURIComponent(featureKey)}`);
  }

  return (
    <Dialog open={open} onOpenChange={onOpenChange}>
      <DialogContent className="max-w-sm">
        <DialogHeader>
          <DialogTitle className="flex items-center gap-2">
            <Sparkles className="h-5 w-5 text-primary" />
            {featureLabel}
          </DialogTitle>
          <DialogDescription>
            {copy?.tagline ?? `${featureLabel} is available on the Pro plan. Free accounts don't include it.`}
          </DialogDescription>
        </DialogHeader>
        {copy && (
          <ul className="space-y-1.5">
            {copy.bullets.map((bullet) => (
              <li key={bullet} className="flex items-start gap-2 text-sm">
                <Check className="h-4 w-4 text-primary shrink-0 mt-0.5" />
                <span>{bullet}</span>
              </li>
            ))}
          </ul>
        )}
        <p className="text-sm text-muted-foreground">
          Included on the Pro plan (€4.99/mo).
        </p>
        <DialogFooter className="sm:justify-start">
          <Button onClick={handleUpgradeClick}>
            See Pro plans
          </Button>
        </DialogFooter>
      </DialogContent>
    </Dialog>
  );
}