import { Component, type ErrorInfo, type ReactNode } from "react";
import { restartActiveDungeonSession } from "../game/dungeonSession";
import { useGameStore } from "../game/store";

interface Props { children: ReactNode }
interface State {
  error: Error | null;
  retryCount: number;
  retryScheduled: boolean;
}

const MAX_AUTOMATIC_RETRIES = 1;
const AUTOMATIC_RETRY_DELAY_MS = 500;
const RETRY_BUDGET_RESET_MS = 60_000;

export class SceneErrorBoundary extends Component<Props, State> {
  state: State = { error: null, retryCount: 0, retryScheduled: false };
  private retryTimer: number | null = null;
  private retryBudgetTimer: number | null = null;

  static getDerivedStateFromError(error: Error): Partial<State> {
    return { error };
  }

  componentDidCatch(error: Error, info: ErrorInfo) {
    console.error("Healer Man scene failed", error, info.componentStack);
    useGameStore.getState().setAssetStatus("error", error.message);
    if (this.retryBudgetTimer !== null) {
      window.clearTimeout(this.retryBudgetTimer);
      this.retryBudgetTimer = null;
    }
    if (this.state.retryCount < MAX_AUTOMATIC_RETRIES) this.scheduleRetry();
  }

  componentWillUnmount(): void {
    if (this.retryTimer !== null) window.clearTimeout(this.retryTimer);
    if (this.retryBudgetTimer !== null) window.clearTimeout(this.retryBudgetTimer);
  }

  private scheduleRetry(): void {
    if (this.retryTimer !== null) return;
    this.setState({ retryScheduled: true });
    this.retryTimer = window.setTimeout(() => {
      this.retryTimer = null;
      this.retryScene();
    }, AUTOMATIC_RETRY_DELAY_MS);
  }

  private retryScene = (): void => {
    const retryCount = this.state.retryCount + 1;
    try {
      if (!restartActiveDungeonSession()) {
        this.setState({ retryScheduled: false });
        return;
      }
      this.setState({ error: null, retryCount, retryScheduled: false });
      this.retryBudgetTimer = window.setTimeout(() => {
        this.retryBudgetTimer = null;
        if (!this.state.error) this.setState({ retryCount: 0 });
      }, RETRY_BUDGET_RESET_MS);
    } catch (error) {
      const nextError = error instanceof Error ? error : new Error("The dungeon retry failed.");
      console.error("Healer Man scene retry failed", nextError);
      useGameStore.getState().setAssetStatus("error", nextError.message);
      this.setState({ error: nextError, retryCount, retryScheduled: false });
    }
  }

  render() {
    if (!this.state.error) return this.props.children;
    return (
      <div className="scene-error" role="alert">
        <p className="eyebrow">Dungeon load interrupted</p>
        <h1>{this.state.retryScheduled ? "Recovering the expedition..." : "The cavern could not be assembled."}</h1>
        <p>
          {this.state.retryScheduled
            ? "Clearing the failed asset cache and rebuilding the dungeon in smaller batches."
            : this.state.error.message}
        </p>
        {!this.state.retryScheduled && (
          <button type="button" className="button button--primary" onClick={this.retryScene}>
            Retry dungeon
          </button>
        )}
      </div>
    );
  }
}