import { useEffect, useRef, useState } from "react";

import { api } from "../api/client";
import type { Garden as GardenData, GardenActivity } from "../api/types";
import { ru } from "../content/ru";
import { useDialog } from "../dialog/DialogContext";
import { useSession } from "../session/SessionContext";
import { Icon, type IconName } from "./Icon";
import { useToast } from "./Toast";

/*
 * «Ваш сад» (#119, slide 13): every useful activity grows the garden. Without pressure — it never wilts, does not
 * depend on answers, nobody competes; there are no streaks, no «missed» marks and no red. The numbers come from the
 * server (#118); this only draws them.
 */

const FLOWERS = ["#d9604c", "#e9a23b", "#c96f9a", "#e07a3f", "#b9577a", "#d4a02a"];
const SLOTS = [44, 92, 140, 188, 236, 284];
const GROUND = 128;
const ICONS: Record<GardenActivity, IconName> = { meds: "pill", diary: "book", questionnaire: "clipboard" };
const seenKey = (token: string) => `ptsr.garden.steps.${token}`;

function Plant({ x, stage, color, fresh }: { x: number; stage: number; color: string; fresh: boolean }) {
  if (stage <= 0) return <ellipse cx={x} cy={GROUND + 1} rx={5} ry={2} fill="#c9b08a" opacity={0.7} />;
  const h = [0, 18, 38, 54, 62][Math.min(stage, 4)];
  const top = GROUND - h;
  return (
    <g
      className={fresh ? "garden__plant garden__plant--fresh" : "garden__plant"}
      style={{ transformOrigin: `${x}px ${GROUND}px` }}
    >
      <path
        d={`M${x} ${GROUND} C ${x - 2} ${GROUND - h / 2}, ${x + 2} ${top + h / 3}, ${x} ${top}`}
        stroke="#4f7d5a"
        strokeWidth={2.4}
        fill="none"
        strokeLinecap="round"
      />
      <path d={`M${x} ${GROUND - h * 0.35} q -11 -3 -13 -11 q 10 0 13 9`} fill="#6f9c6a" />
      {stage >= 2 && <path d={`M${x} ${GROUND - h * 0.6} q 11 -3 13 -11 q -10 0 -13 9`} fill="#6f9c6a" />}
      {stage === 1 && <path d={`M${x} ${top + 2} q 8 -4 9 -10 q -8 1 -9 8`} fill="#7fae74" />}
      {stage === 3 && <ellipse cx={x} cy={top - 3} rx={4.5} ry={7} fill={color} />}
      {stage >= 4 && (
        <g>
          {[0, 72, 144, 216, 288].map((a) => (
            <ellipse key={a} cx={x} cy={top - 8} rx={4.6} ry={8} fill={color} transform={`rotate(${a} ${x} ${top})`} />
          ))}
          <circle cx={x} cy={top} r={4.2} fill="#f6d36b" />
        </g>
      )}
    </g>
  );
}

export function Garden({ refreshKey }: { refreshKey?: unknown }) {
  const { session } = useSession();
  const dialog = useDialog();
  const toast = useToast();
  const [garden, setGarden] = useState<GardenData | null>(null);
  const [freshFrom, setFreshFrom] = useState<number | null>(null);
  const announced = useRef(false);

  useEffect(() => {
    if (!session) return;
    let alive = true;
    api
      .garden(session.token)
      .then((g) => {
        if (!alive) return;
        setGarden(g);
        const raw = window.localStorage.getItem(seenKey(session.token));
        const seen = raw === null ? null : Number(raw);
        // No celebration right after a crisis: growth stays, the toast and the animation do not. The server knows
        // about alerts from scales and questionnaires too (`quiet`); the chat check covers a crisis reply just shown.
        const recentCrisis = dialog.entries.slice(-12).some((e) => e.from === "assistant" && e.reply.kind === "crisis");
        if (seen !== null && g.steps > seen && !g.quiet && !recentCrisis) {
          setFreshFrom(seen);
          if (!announced.current) toast(ru.garden.grew);
          announced.current = true;
        }
        window.localStorage.setItem(seenKey(session.token), String(g.steps));
      })
      .catch(() => undefined);
    return () => {
      alive = false;
    };
  }, [session, refreshKey]);

  if (!garden) return null;
  const t = ru.garden;
  const perPlant = 4;
  const bloom = garden.plants.filter((p) => p.stage >= perPlant).length;
  const growing = garden.plants.filter((p) => p.stage > 0 && p.stage < perPlant).length;
  const share = garden.points_in_step / garden.step_points;

  return (
    <section className="card garden" aria-labelledby="garden-title">
      <div>
        <p className="garden__eyebrow">{t.eyebrow}</p>
        <h2 id="garden-title" className="h3">
          {t.lead}
        </h2>
      </div>
      <svg
        className="garden__scene"
        viewBox="0 0 328 150"
        role="img"
        aria-label={t.label(garden.title, bloom, growing)}
      >
        <defs>
          <linearGradient id="garden-sky" x1="0" y1="0" x2="0" y2="1">
            <stop offset="0" stopColor="#eef3ea" />
            <stop offset="1" stopColor="#f7f3ea" />
          </linearGradient>
        </defs>
        <rect width="328" height="150" rx="12" fill="url(#garden-sky)" />
        <circle cx="282" cy="36" r="17" fill="#f2cc72" opacity={0.9} />
        <path
          d={`M0 ${GROUND + 4} Q 90 ${GROUND - 8} 170 ${GROUND + 2} T 328 ${GROUND - 2} V150 H0 Z`}
          fill="#e5d3b0"
        />
        <path
          d={`M0 ${GROUND + 12} Q 110 ${GROUND + 2} 210 ${GROUND + 12} T 328 ${GROUND + 8} V150 H0 Z`}
          fill="#dcc59c"
        />
        {garden.plants.map((p, i) => {
          // The plant that just grew (its stage covers steps after the last seen count) gets a gentle grow-in.
          const fresh =
            freshFrom !== null && garden.steps > freshFrom && Math.floor((garden.steps - 1) / perPlant) === i;
          return (
            <Plant
              key={i}
              x={SLOTS[i % SLOTS.length]}
              stage={p.stage}
              color={FLOWERS[i % FLOWERS.length]}
              fresh={fresh}
            />
          );
        })}
      </svg>
      <p className="garden__title">{garden.title}</p>
      <div className="garden__progress">
        <div className="garden__progress-head">
          <span>{t.next}</span>
          <span className="muted small">{t.of(garden.points_in_step, garden.step_points)}</span>
        </div>
        <div
          className="garden__bar"
          role="progressbar"
          aria-valuemin={0}
          aria-valuemax={garden.step_points}
          aria-valuenow={garden.points_in_step}
          aria-label={t.next}
        >
          <span style={{ width: `${Math.round(share * 100)}%` }} />
        </div>
      </div>
      {garden.today.length > 0 && (
        <ul className="garden__today" aria-label={t.today}>
          {garden.today.map((item) => (
            <li key={item.activity} className="garden__item">
              <span className="garden__icon" aria-hidden="true">
                <Icon name={ICONS[item.activity]} size={16} />
              </span>
              <span className="garden__item-text">
                {item.title}
                {item.detail && <span className="muted small"> · {item.detail}</span>}
              </span>
              <span
                className={item.done ? "garden__check garden__check--done" : "garden__check"}
                aria-label={item.done ? "сделано" : "ещё нет"}
              >
                {item.done && <Icon name="check" size={14} />}
              </span>
            </li>
          ))}
        </ul>
      )}
      <p className="garden__note">{t.noPressure}</p>
    </section>
  );
}