"use client";

import { useState } from "react";
import { toast } from "sonner";
import { Plus, Pencil, Trash2, Tag } from "lucide-react";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import {
  Dialog,
  DialogContent,
  DialogHeader,
  DialogTitle,
  DialogFooter,
} from "@/components/ui/dialog";
import {
  AlertDialog,
  AlertDialogAction,
  AlertDialogCancel,
  AlertDialogContent,
  AlertDialogDescription,
  AlertDialogFooter,
  AlertDialogHeader,
  AlertDialogTitle,
} from "@/components/ui/alert-dialog";
import { EmptyState } from "@/components/shared/empty-state";

type Ingredient = {
  id: string;
  name: string;
  aliases: string[];
  category: string | null;
};

function parseAliases(input: string): string[] {
  return [...new Set(input.split(",").map((a) => a.trim()).filter(Boolean))];
}

function IngredientDialog({
  ingredient,
  open,
  onOpenChange,
  onSaved,
}: {
  ingredient: Ingredient | null;
  open: boolean;
  onOpenChange: (open: boolean) => void;
  onSaved: (ingredient: Ingredient) => void;
}) {
  const [name, setName] = useState(ingredient?.name ?? "");
  const [aliasesText, setAliasesText] = useState(ingredient?.aliases.join(", ") ?? "");
  const [category, setCategory] = useState(ingredient?.category ?? "");
  const [saving, setSaving] = useState(false);
  const isEdit = !!ingredient;

  async function handleSave() {
    const trimmedName = name.trim();
    if (!trimmedName) return;
    const aliases = parseAliases(aliasesText);
    setSaving(true);
    try {
      const res = await fetch(
        isEdit ? `/api/v1/admin/ingredients/${ingredient.id}` : "/api/v1/admin/ingredients",
        {
          method: isEdit ? "PUT" : "POST",
          headers: { "Content-Type": "application/json" },
          body: JSON.stringify({ name: trimmedName, aliases, category: category.trim() || null }),
        }
      );
      if (!res.ok) {
        const data = await res.json().catch(() => null) as { error?: string } | null;
        toast.error(data?.error ?? "Failed to save");
        return;
      }
      toast.success(isEdit ? "Ingredient updated" : "Ingredient created");
      const id = isEdit ? ingredient.id : ((await res.json()) as { id: string }).id;
      onSaved({ id, name: trimmedName, aliases, category: category.trim() || null });
      onOpenChange(false);
    } finally {
      setSaving(false);
    }
  }

  return (
    <Dialog open={open} onOpenChange={onOpenChange}>
      <DialogContent className="max-w-md">
        <DialogHeader>
          <DialogTitle>{isEdit ? "Edit ingredient" : "New ingredient"}</DialogTitle>
        </DialogHeader>
        <div className="space-y-3">
          <div className="space-y-1.5">
            <Label htmlFor="ingredient-name">Canonical name</Label>
            <Input id="ingredient-name" value={name} onChange={(e) => setName(e.target.value)} placeholder="e.g. salt" />
          </div>
          <div className="space-y-1.5">
            <Label htmlFor="ingredient-aliases">Aliases (comma-separated)</Label>
            <Input
              id="ingredient-aliases"
              value={aliasesText}
              onChange={(e) => setAliasesText(e.target.value)}
              placeholder="e.g. sel, sel fin, sel de table, table salt"
            />
            <p className="text-xs text-muted-foreground">
              Matched case-insensitively against pantry item and recipe ingredient names.
            </p>
          </div>
          <div className="space-y-1.5">
            <Label htmlFor="ingredient-category">Category (optional)</Label>
            <Input id="ingredient-category" value={category} onChange={(e) => setCategory(e.target.value)} placeholder="e.g. spicesCondiments" />
          </div>
        </div>
        <DialogFooter>
          <Button type="button" variant="outline" onClick={() => onOpenChange(false)} disabled={saving}>
            Cancel
          </Button>
          <Button type="button" onClick={() => { void handleSave(); }} disabled={saving || !name.trim()}>
            {saving ? "Saving…" : "Save"}
          </Button>
        </DialogFooter>
      </DialogContent>
    </Dialog>
  );
}

export function IngredientsManager({ initialIngredients }: { initialIngredients: Ingredient[] }) {
  const [ingredients, setIngredients] = useState<Ingredient[]>(initialIngredients);
  const [dialogOpen, setDialogOpen] = useState(false);
  const [editingIngredient, setEditingIngredient] = useState<Ingredient | null>(null);
  const [confirmId, setConfirmId] = useState<string | null>(null);

  function openCreate() {
    setEditingIngredient(null);
    setDialogOpen(true);
  }

  function openEdit(ingredient: Ingredient) {
    setEditingIngredient(ingredient);
    setDialogOpen(true);
  }

  async function handleDelete(id: string) {
    const res = await fetch(`/api/v1/admin/ingredients/${id}`, { method: "DELETE" });
    if (res.ok) {
      setIngredients((prev) => prev.filter((i) => i.id !== id));
      toast.success("Ingredient deleted");
    } else {
      toast.error("Failed to delete");
    }
  }

  const pendingDelete = ingredients.find((i) => i.id === confirmId) ?? null;

  return (
    <div className="space-y-4 max-w-3xl">
      <div className="flex justify-end">
        <Button size="sm" onClick={openCreate}>
          <Plus className="h-4 w-4" /> New ingredient
        </Button>
      </div>

      {ingredients.length === 0 ? (
        <EmptyState icon={Tag} title="No ingredients yet" description="Add a canonical ingredient and its common name variants." compact />
      ) : (
        <div className="rounded-xl border divide-y">
          {ingredients.map((ingredient) => (
            <div key={ingredient.id} className="flex items-center gap-3 px-4 py-3">
              <div className="flex-1 min-w-0">
                <div className="flex items-center gap-2">
                  <span className="font-medium text-sm">{ingredient.name}</span>
                  {ingredient.category && (
                    <span className="text-[10px] font-medium uppercase tracking-wide text-muted-foreground bg-muted rounded px-1.5 py-0.5">
                      {ingredient.category}
                    </span>
                  )}
                </div>
                {ingredient.aliases.length > 0 && (
                  <p className="text-xs text-muted-foreground mt-0.5 truncate">{ingredient.aliases.join(", ")}</p>
                )}
              </div>
              <button onClick={() => openEdit(ingredient)} aria-label="Edit" className="text-muted-foreground hover:text-foreground transition-colors shrink-0">
                <Pencil className="h-4 w-4" />
              </button>
              <button onClick={() => setConfirmId(ingredient.id)} aria-label="Delete" className="text-muted-foreground hover:text-destructive transition-colors shrink-0">
                <Trash2 className="h-4 w-4" />
              </button>
            </div>
          ))}
        </div>
      )}

      <IngredientDialog
        ingredient={editingIngredient}
        open={dialogOpen}
        onOpenChange={setDialogOpen}
        onSaved={(saved) => {
          setIngredients((prev) => {
            const exists = prev.some((i) => i.id === saved.id);
            const next = exists ? prev.map((i) => (i.id === saved.id ? saved : i)) : [...prev, saved];
            return next.sort((a, b) => a.name.localeCompare(b.name));
          });
        }}
      />

      <AlertDialog open={confirmId !== null} onOpenChange={(open) => !open && setConfirmId(null)}>
        <AlertDialogContent>
          <AlertDialogHeader>
            <AlertDialogTitle>Delete this ingredient?</AlertDialogTitle>
            <AlertDialogDescription>
              {pendingDelete ? `"${pendingDelete.name}" and its aliases will no longer be recognized as a match. Pantry items and recipe ingredients already linked to it just lose that link — nothing is deleted.` : ""}
            </AlertDialogDescription>
          </AlertDialogHeader>
          <AlertDialogFooter>
            <AlertDialogCancel>Cancel</AlertDialogCancel>
            <AlertDialogAction
              onClick={() => {
                if (confirmId) void handleDelete(confirmId);
                setConfirmId(null);
              }}
              className="bg-destructive text-destructive-foreground hover:bg-destructive/90"
            >
              Delete
            </AlertDialogAction>
          </AlertDialogFooter>
        </AlertDialogContent>
      </AlertDialog>
    </div>
  );
}
