import { useEffect, useState } from "react";
import { useMutation, useQueryClient } from "@tanstack/react-query";
import type { Bootstrap, Item } from "../../types.js";
import { helpers, enrichItems } from "../../types.js";
import { getToday, getStoredTimezone } from "../../tz.js";
import { fmt } from "../../format.js";
import { api } from "../../api.js";
import { Btn, Field, Icon, Input, Textarea } from "../primitives/index.js";
import { ScanField, type ScanResult } from "../ScanField.js";
import { ModalBackdrop, ModalHeader, ModalFooter } from "./ModalChrome.js";
import { useToast } from "../Toast.js";

export function ConsumeFlow({
  data,
  onClose,
  item: initialItem,
}: {
  data: Bootstrap;
  onClose: () => void;
  item: Item | null;
}) {
  const qc = useQueryClient();
  const { toast } = useToast();
  const allItems = enrichItems(data);
  const active = allItems.filter((i) => i.status === "active" || i.status === "checked-out");
  const [itemId, setItemId] = useState(initialItem?.id ?? "");
  const [rating, setRating] = useState<number | null>(null);
  const [notes, setNotes] = useState("");
  const [date, setDate] = useState(getToday(getStoredTimezone()));
  const [error, setError] = useState<string | null>(null);
  const [confirming, setConfirming] = useState(false);

  const item = allItems.find((i) => i.id === itemId);

  useEffect(() => { setError(null); setConfirming(false); }, [itemId]);

  const finish = useMutation({
    mutationFn: () => api.finishInventoryItem(itemId, { date, rating: rating ?? undefined, notes }),
    onSuccess: () => {
      qc.invalidateQueries({ queryKey: ["bootstrap"] });
      const ratingStr = rating != null ? ` — ${rating}/5 stars` : "";
      const undoItemId = itemId;
      const undoBinId = item?.binId ?? data.bins[0]?.id ?? "";
      toast(`Marked ${item?.name ?? "item"} as consumed${ratingStr}`, "success", {
        label: "Undo",
        onClick: () => {
          api.reactivateInventoryItem(undoItemId, { binId: undoBinId }).then(() => {
            qc.invalidateQueries({ queryKey: ["bootstrap"] });
          });
        },
      });
      onClose();
    },
    onError: (e: Error) => setError(e.message),
  });

  const handleScan = (result: ScanResult) => {
    if (result.kind === "item") {
      setItemId(result.item.id);
    }
  };

  const bin = item ? data.bins.find((b) => b.id === item.binId) : undefined;
  const lifespan = item ? Math.round((+new Date(date) - +new Date(item.purchaseDate)) / 86_400_000) : 0;

  return (
    <ModalBackdrop onClose={onClose}>
      <div
        style={{
          width: "min(720px, 96vw)",
          margin: "40px 20px",
          background: "var(--bg)",
          border: "1px solid var(--line)",
          borderRadius: "var(--r-lg)",
          boxShadow: "var(--shadow-lg)",
        }}
      >
        <ModalHeader title="Mark as consumed" eyebrow="" onClose={onClose} />

        <div style={{ padding: 32 }}>
          <ScanField
            items={active}
            products={[]}
            matchedLabel={item ? `${item.assetId} · ${item.name}` : null}
            onMatch={handleScan}
            mode="assetId"
          />

          {!item ? (
            <div style={{ marginTop: 24, textAlign: "center", color: "var(--ink-3)", fontSize: 13, fontStyle: "italic", padding: "24px 0" }}>
              Scan an asset ID to continue.
            </div>
          ) : (
            <>
              <div
                style={{
                  marginTop: 16,
                  padding: 16,
                  background: "var(--bg-2)",
                  border: "1px solid var(--line)",
                  borderRadius: "var(--r-md)",
                  display: "flex",
                  justifyContent: "space-between",
                  alignItems: "center",
                }}
              >
                <div>
                  <div className="serif" style={{ fontSize: 22, fontWeight: 500 }}>
                    {item.name}
                  </div>
                  <div style={{ fontSize: 12, color: "var(--ink-3)" }}>
                    <span className="mono">{item.assetId}</span> · {helpers.brandName(data, item.brandId)} · {bin?.name} · purchased{" "}
                    {fmt.dateShort(item.purchaseDate, getStoredTimezone())}
                  </div>
                </div>
                <div style={{ textAlign: "right" }}>
                  <div className="mono" style={{ fontSize: 11, color: "var(--ink-3)" }}>LASTED</div>
                  <div className="serif" style={{ fontSize: 24 }}>{lifespan} days</div>
                </div>
              </div>

              <div style={{ display: "grid", gridTemplateColumns: "1fr 1fr", gap: 16, marginTop: 24 }}>
                <Field label="Date finished">
                  <Input type="date" value={date} onChange={(e) => setDate(e.target.value)} />
                </Field>
                <Field label="Rating" hint="Optional — click to rate, click again to clear">
                  <div
                    style={{
                      display: "flex",
                      gap: 4,
                      alignItems: "center",
                      padding: "10px 12px",
                      background: "var(--bg)",
                      border: "1px solid var(--line)",
                      borderRadius: "var(--r-md)",
                    }}
                  >
                    {[1, 2, 3, 4, 5].map((n) => (
                      <button
                        key={n}
                        onClick={() => setRating(rating === n ? null : n)}
                        style={{ border: "none", background: "transparent", cursor: "pointer", padding: 2 }}
                      >
                        <Icon
                          name="star"
                          size={20}
                          color={rating != null && n <= rating ? "var(--amber)" : "var(--ink-4)"}
                        />
                      </button>
                    ))}
                    <span
                      style={{
                        marginLeft: "auto",
                        fontSize: 12,
                        color: "var(--ink-3)",
                        fontFamily: "var(--mono)",
                      }}
                    >
                      {rating != null ? `${rating}/5` : "—"}
                    </span>
                  </div>
                </Field>
              </div>
              <div style={{ marginTop: 16 }}>
                <Field label="Final notes" hint="Flavor, effects, would you rebuy">
                  <Textarea
                    value={notes}
                    onChange={(e) => setNotes(e.target.value)}
                    placeholder="What stood out?"
                  />
                </Field>
              </div>
            </>
          )}

          {confirming && item && (
            <div
              style={{
                marginTop: 20,
                padding: 14,
                background: "var(--amber-soft)",
                border: "1px solid var(--amber)",
                borderRadius: "var(--r-md)",
                fontSize: 13,
              }}
            >
              Mark <strong>{item.name}</strong> (<span className="mono">{item.assetId}</span>) as consumed? This cannot be undone.
            </div>
          )}

          {error && (
            <div style={{ marginTop: 14, fontSize: 12, color: "var(--terracotta)" }}>{error}</div>
          )}
        </div>

        <ModalFooter>
          <div style={{ fontSize: 12, color: "var(--ink-3)" }}>
            {item ? `Lasted ${lifespan} day${lifespan === 1 ? "" : "s"} from purchase.` : ""}
          </div>
          <div style={{ display: "flex", gap: 8 }}>
            <Btn variant="ghost" onClick={onClose}>Cancel</Btn>
            {confirming ? (
              <>
                <Btn variant="ghost" onClick={() => setConfirming(false)}>Back</Btn>
                <Btn
                  variant="danger"
                  icon="check"
                  disabled={finish.isPending}
                  onClick={() => finish.mutate()}
                >
                  {finish.isPending ? "Saving…" : "Confirm"}
                </Btn>
              </>
            ) : (
              <Btn
                variant="primary"
                icon="check"
                disabled={!item}
                onClick={() => setConfirming(true)}
              >
                {error ? "Try again" : "Mark consumed"}
              </Btn>
            )}
          </div>
        </ModalFooter>
      </div>
    </ModalBackdrop>
  );
}