import { useDungeonSimulationStore } from "../game/dungeonSimulationStore";
import { dungeonRouteDefinition } from "../game/dungeonRoutes";
import type { DungeonSimulationSpeed } from "../game/dungeonSimulationTypes";
import { finalizeDungeonSimulation } from "../scene/DungeonSimulationSceneBridge";
import { useShellStore } from "../app/shellStore";
import { classById } from "../app/characterCatalog";
import { PARTY_ROLE_LABELS, usePartyStore } from "../game/partyStore";

const SPEEDS: readonly DungeonSimulationSpeed[] = [0.5, 1, 2, 4];

function formatTime(elapsedMs: number): string {
  const seconds = Math.floor(elapsedMs / 1_000);
  return `${String(Math.floor(seconds / 60)).padStart(2, "0")}:${String(seconds % 60).padStart(2, "0")}.${Math.floor((elapsedMs % 1_000) / 100)}`;
}

function downloadReport(): void {
  const simulation = useDungeonSimulationStore.getState();
  const report = simulation.replay?.report;
  if (!report) return;
  const url = URL.createObjectURL(new Blob([JSON.stringify(report, null, 2)], { type: "application/json" }));
  const anchor = document.createElement("a");
  anchor.href = url;
  anchor.download = `${report.dungeonId}-${report.seed}-SimulationReportV1.json`;
  anchor.click();
  URL.revokeObjectURL(url);
}

export function DungeonSimulationHud() {
  const simulation = useDungeonSimulationStore();
  const partyMembers = usePartyStore((state) => state.members);
  const route = simulation.dungeonId
    ? dungeonRouteDefinition(simulation.dungeonId, simulation.routeId ?? "primary")
    : null;
  const leg = route?.legs.find((candidate) => candidate.objectiveId === simulation.objectiveId) ?? null;
  const replayDuration = simulation.replay?.durationMs ?? 0;
  const fallbackMember = partyMembers.find((member) => member.health > 0) ?? partyMembers[0] ?? null;
  const spectatedMember = partyMembers.find((member) => member.id === simulation.spectatedMemberId)
    ?? fallbackMember;

  const returnToGmTools = () => {
    useDungeonSimulationStore.getState().leave();
    useShellStore.getState().openGmAdmin();
  };

  return (
    <aside className="dungeon-sim-hud" aria-label="Dungeon simulation controls">
      <div className="dungeon-sim-hud__header">
        <div>
          <small>{simulation.sessionMode === "spectate-replay" ? "Recorded replay" : simulation.mode.replace("-", " ")}</small>
          <strong>{simulation.dungeonId ?? "Dungeon simulation"}</strong>
        </div>
        <time>{formatTime(simulation.elapsedMs)}</time>
      </div>

      <div className="dungeon-sim-hud__controls">
        <button type="button" onClick={simulation.toggleRunning} disabled={simulation.runState === "finished"}>
          {simulation.runState === "running" ? "Pause" : "Play"}
        </button>
        <button type="button" onClick={simulation.step} disabled={simulation.runState !== "paused"}>Step</button>
        {SPEEDS.map((speed) => (
          <button
            type="button"
            key={speed}
            className={simulation.speed === speed ? "is-active" : undefined}
            onClick={() => simulation.setSpeed(speed)}
          >
            {speed}×
          </button>
        ))}
        <button
          type="button"
          className={simulation.cameraMode === "follow-member" ? "is-active" : undefined}
          aria-pressed={simulation.cameraMode === "follow-member"}
          onClick={() => simulation.setCameraMode("follow-member")}
        >
          Follow member
        </button>
        <button
          type="button"
          className={simulation.cameraMode === "free-fly" ? "is-active" : undefined}
          aria-pressed={simulation.cameraMode === "free-fly"}
          onClick={() => simulation.setCameraMode("free-fly")}
        >
          Free camera
        </button>
        {simulation.sessionMode === "spectate-live" && simulation.runState !== "finished" ? (
          <button type="button" className="is-danger" onClick={() => void finalizeDungeonSimulation("stopped")}>
            Stop & save
          </button>
        ) : null}
        {simulation.replay && <button type="button" onClick={downloadReport}>Download JSON</button>}
        {simulation.runState === "finished" && <button type="button" onClick={returnToGmTools}>Return to GM Tools</button>}
      </div>

      <section className="dungeon-sim-hud__spectate" aria-label="Spectate party member">
        <header>
          <span>{simulation.cameraMode === "free-fly" ? "Free camera" : "Following"}</span>
          <strong>{simulation.cameraMode === "free-fly" ? "Detached" : spectatedMember?.name ?? "Waiting for party"}</strong>
        </header>
        <div>
          {partyMembers.map((member) => {
            const characterClass = classById(member.classId);
            const selected = simulation.cameraMode === "follow-member" && member.id === spectatedMember?.id;
            return (
              <button
                type="button"
                key={member.id}
                className={selected ? "is-active" : undefined}
                aria-pressed={selected}
                onClick={() => simulation.setSpectatedMember(member.id)}
              >
                <i style={{ background: characterClass.color }} aria-hidden="true" />
                <span><strong>{member.name}</strong><small>{PARTY_ROLE_LABELS[member.role]} · {member.specialization}</small></span>
                <em>{Math.max(0, Math.ceil(member.health))}</em>
              </button>
            );
          })}
        </div>
        <p>{simulation.cameraMode === "free-fly"
          ? "Right-drag/Arrows look · WASD fly · E/Space up · Q/Ctrl down · Shift boost"
          : "Choose a party member to follow · Right-drag/Arrows orbit"}</p>
      </section>

      {simulation.sessionMode === "spectate-replay" && (
        <label className="dungeon-sim-hud__seek">
          <span>Replay position</span>
          <input
            type="range"
            min={0}
            max={replayDuration}
            step={100}
            value={Math.min(simulation.elapsedMs, replayDuration)}
            onChange={(event) => simulation.seekReplay(Number(event.target.value))}
          />
        </label>
      )}

      <dl className="dungeon-sim-hud__status">
        <div><dt>State</dt><dd>{simulation.runState}{simulation.result ? ` · ${simulation.result}` : ""}</dd></div>
        <div><dt>Objective</dt><dd>{leg?.objectiveName ?? simulation.objectiveId ?? "Complete"}</dd></div>
        <div><dt>Checkpoint</dt><dd>{leg ? `${Math.min(simulation.checkpointIndex + 1, leg.checkpoints.length)} / ${leg.checkpoints.length}` : "—"}</dd></div>
        <div><dt>Route</dt><dd>{simulation.routeHash?.slice(0, 12) ?? "—"}</dd></div>
      </dl>

      <section className="dungeon-sim-hud__findings">
        <header><strong>Findings</strong><span>{simulation.findings.length}</span></header>
        <ol>
          {[...simulation.findings].reverse().slice(0, 12).map((finding) => (
            <li key={finding.id} data-severity={finding.severity}>
              <time>{formatTime(finding.atMs)}</time>
              <span>{finding.message}</span>
            </li>
          ))}
        </ol>
      </section>
    </aside>
  );
}