import { Button } from "@cloudflare/kumo";
import { ArrowUUpLeftIcon, CaretRightIcon, CheckCircleIcon, DownloadSimpleIcon, GraphIcon, ImagesIcon, PlayIcon, PlusIcon, RowsIcon, ShareNetworkIcon, SlidersHorizontalIcon, SparkleIcon, SquaresFourIcon, WarningCircleIcon, XIcon } from "@phosphor-icons/react";
import { AnimatePresence, motion } from "motion/react";
import { useEffect, useMemo, useRef, useState } from "react";
import { getDef } from "../lib/registry";
import type { CanvasNode, FileRef, OutputValue } from "../lib/types";
import { OutputView } from "./OutputView";
import { useCanvasStore } from "../store/useCanvasStore";
import { useCopilotStore } from "../store/useCopilotStore";

export type MobilePanel = "library" | "inspector" | "copilot" | "results" | null;

/** Which panel is showing on a phone. Only one fits, so the last one opened wins. */
export function useMobilePanel(active: boolean): MobilePanel {
  const leftOpen = useCanvasStore((s) => s.leftOpen);
  const rightOpen = useCanvasStore((s) => s.rightOpen);
  const copilotOpen = useCopilotStore((s) => s.open);
  const resultsOpen = useCanvasStore((s) => s.resultsOpen);
  const setLeftOpen = useCanvasStore((s) => s.setLeftOpen);
  const setRightOpen = useCanvasStore((s) => s.setRightOpen);
  const setResultsOpen = useCanvasStore((s) => s.setResultsOpen);
  const setCopilotOpen = useCopilotStore((s) => s.setOpen);
  const prev = useRef({ leftOpen, rightOpen, copilotOpen, resultsOpen });

  useEffect(() => {
    if (!active) return;
    const p = prev.current;
    prev.current = { leftOpen, rightOpen, copilotOpen, resultsOpen };
    const opened =
      (resultsOpen && !p.resultsOpen && "results") || (leftOpen && !p.leftOpen && "library") || (rightOpen && !p.rightOpen && "inspector") || (copilotOpen && !p.copilotOpen && "copilot") || null;
    if (!opened) return;
    if (opened !== "library" && leftOpen) setLeftOpen(false);
    if (opened !== "inspector" && rightOpen) setRightOpen(false);
    if (opened !== "copilot" && copilotOpen) setCopilotOpen(false);
    if (opened !== "results" && resultsOpen) setResultsOpen(false);
  }, [active, leftOpen, rightOpen, copilotOpen, resultsOpen, setLeftOpen, setRightOpen, setCopilotOpen, setResultsOpen]);

  if (!active) return null;
  return resultsOpen ? "results" : copilotOpen ? "copilot" : rightOpen ? "inspector" : leftOpen ? "library" : null;
}

/** Full-height sheet over the work area; the header carries the close button. */
export function MobileSheet({ panel, title, children }: { panel: MobilePanel; title: string; children: React.ReactNode }) {
  const setLeftOpen = useCanvasStore((s) => s.setLeftOpen);
  const setRightOpen = useCanvasStore((s) => s.setRightOpen);
  const setCopilotOpen = useCopilotStore((s) => s.setOpen);
  const setResultsOpen = useCanvasStore((s) => s.setResultsOpen);
  const close = () => {
    setLeftOpen(false);
    setRightOpen(false);
    setCopilotOpen(false);
    setResultsOpen(false);
  };
  return (
    <AnimatePresence initial={false}>
      {panel && (
        <motion.section
          key={panel}
          className="m-sheet"
          initial={{ y: "100%" }}
          animate={{ y: 0 }}
          exit={{ y: "100%" }}
          transition={{ duration: 0.22, ease: [0.16, 1, 0.3, 1] }}
          aria-label={title}
        >
          <header className="m-sheet__head">
            <span className="truncate">{title}</span>
            <button type="button" className="m-sheet__close" onClick={close} aria-label="Close">
              <XIcon size={14} weight="bold" />
            </button>
          </header>
          <div className="min-h-0 flex-1">{children}</div>
        </motion.section>
      )}
    </AnimatePresence>
  );
}

/** Bottom tab bar: what the side toggles and view switch do on a desktop. */
export function MobileBar({ panel }: { panel: MobilePanel }) {
  const view = useCanvasStore((s) => s.view);
  const setView = useCanvasStore((s) => s.setView);
  const setLeftOpen = useCanvasStore((s) => s.setLeftOpen);
  const setRightOpen = useCanvasStore((s) => s.setRightOpen);
  const setInspectorTab = useCanvasStore((s) => s.setInspectorTab);
  const openPalette = useCanvasStore((s) => s.openPalette);
  const selectedCount = useCanvasStore((s) => s.nodes.filter((n) => n.selected).length);
  const running = useCanvasStore((s) => s.run.running);
  const queued = useCanvasStore((s) => s.queue.length);
  const setCopilotOpen = useCopilotStore((s) => s.setOpen);
  const setResultsOpen = useCanvasStore((s) => s.setResultsOpen);

  const closeAll = () => {
    setLeftOpen(false);
    setRightOpen(false);
    setCopilotOpen(false);
    setResultsOpen(false);
  };
  const toggle = (which: Exclude<MobilePanel, null>) => {
    if (panel === which) return closeAll();
    if (which === "library") setLeftOpen(true);
    else if (which === "results") setResultsOpen(true);
    else if (which === "inspector") {
      setInspectorTab("properties");
      setRightOpen(true);
    } else setCopilotOpen(true);
  };
  const ViewIcon = view === "canvas" ? GraphIcon : RowsIcon;

  return (
    <nav className="m-bar" aria-label="Mobile navigation">
      <button type="button" className="m-bar__btn" data-active={panel === "library" || undefined} onClick={() => toggle("library")}>
        <SquaresFourIcon size={20} weight={panel === "library" ? "fill" : "regular"} />
        <span>Library</span>
      </button>
      <button
        type="button"
        className="m-bar__btn"
        data-active={!panel || undefined}
        onClick={() => {
          if (panel) closeAll();
          else setView(view === "canvas" ? "pipeline" : "canvas");
        }}
        title={panel ? "Back to the workflow" : `Switch to ${view === "canvas" ? "pipeline" : "canvas"} view`}
      >
        <ViewIcon size={20} weight={!panel ? "fill" : "regular"} />
        <span>{view === "canvas" ? "Canvas" : "Pipeline"}</span>
      </button>
      <button type="button" className="m-bar__btn m-bar__btn--add" onClick={() => openPalette(null)} aria-label="Add a node">
        <span className="m-bar__add">
          <PlusIcon size={20} weight="bold" />
        </span>
        <span>Add</span>
      </button>
      <button type="button" className="m-bar__btn" data-active={panel === "inspector" || undefined} onClick={() => toggle("inspector")}>
        <span className="relative">
          <SlidersHorizontalIcon size={20} weight={panel === "inspector" ? "fill" : "regular"} />
          {(selectedCount > 0 || running || queued > 0) && <i className="m-bar__dot" />}
        </span>
        <span>{selectedCount > 0 ? "Node" : "Inspect"}</span>
      </button>
      <button type="button" className="m-bar__btn" data-active={panel === "copilot" || undefined} onClick={() => toggle("copilot")}>
        <SparkleIcon size={20} weight={panel === "copilot" ? "fill" : "regular"} />
        <span>Copilot</span>
      </button>
    </nav>
  );
}

/* Run strip -------------------------------------------------------------- */

const fmtSecs = (ms: number) => (ms < 60_000 ? `${Math.round(ms / 1000)}s` : `${Math.floor(ms / 60_000)}m ${Math.round((ms % 60_000) / 1000)}s`);

/** Under the top bar while a run is active: the current step, its ETA, and a tap to jump to it. */
export function RunStrip() {
  const run = useCanvasStore((s) => s.run);
  const current = useCanvasStore((s) => (s.run.currentNodeId ? s.nodes.find((n) => n.id === s.run.currentNodeId) : undefined));
  const runningNode = useCanvasStore((s) => s.nodes.find((n) => n.data.status === "running"));
  const failedNode = useCanvasStore((s) => s.nodes.find((n) => n.data.status === "error"));
  const queued = useCanvasStore((s) => s.queue.length);
  const selectNodes = useCanvasStore((s) => s.selectNodes);
  const setResultsOpen = useCanvasStore((s) => s.setResultsOpen);
  const [, tick] = useState(0);

  // The "Done" state hides itself after a few seconds.
  const finished = !run.running && run.finishedAt !== null && Date.now() - run.finishedAt < 6000;
  useEffect(() => {
    if (run.running) {
      const t = setInterval(() => tick((x) => x + 1), 1000);
      return () => clearInterval(t);
    }
    if (run.finishedAt === null) return;
    const t = setTimeout(() => tick((x) => x + 1), 6100);
    return () => clearTimeout(t);
  }, [run.running, run.finishedAt]);

  const show = run.running || finished;
  const node = runningNode ?? current;
  const title = node ? node.data.title ?? getDef(node.data.defType).title : null;
  const frac = run.total ? Math.min(1, (run.completed + (runningNode?.data.progress ?? 0)) / run.total) : 0;
  const jump = (id: string) => {
    selectNodes([id]);
    window.dispatchEvent(new CustomEvent("gr-canvas:focus-node", { detail: id }));
  };

  return (
    <AnimatePresence initial={false}>
      {show && (
        <motion.button
          type="button"
          className="run-strip"
          data-state={run.running ? "running" : run.ok ? "done" : "failed"}
          initial={{ height: 0, opacity: 0 }}
          animate={{ height: 36, opacity: 1 }}
          exit={{ height: 0, opacity: 0 }}
          transition={{ duration: 0.2, ease: [0.16, 1, 0.3, 1] }}
          onClick={() => {
            if (run.running) {
              if (node) jump(node.id);
            } else if (run.ok) setResultsOpen(true);
            else if (failedNode) jump(failedNode.id);
          }}
        >
          {run.running ? (
            <>
              <span className="run-strip__spinner" aria-hidden />
              <span className="run-strip__main truncate">{title ?? "Starting…"}</span>
              <span className="run-strip__meta">
                {runningNode?.data.statusText ?? (run.total ? `${Math.min(run.completed + 1, run.total)}/${run.total}` : fmtSecs(Date.now() - run.startedAt))}
                {queued > 0 && ` · +${queued} queued`}
              </span>
              <span className="run-strip__bar" style={{ transform: `scaleX(${frac})` }} aria-hidden />
            </>
          ) : run.ok ? (
            <>
              <CheckCircleIcon size={16} weight="fill" />
              <span className="run-strip__main truncate">Done in {fmtSecs(Date.now() - run.startedAt)}</span>
              <span className="run-strip__meta">
                Results <CaretRightIcon size={11} weight="bold" />
              </span>
            </>
          ) : (
            <>
              <WarningCircleIcon size={16} weight="fill" />
              <span className="run-strip__main truncate">{failedNode ? `${failedNode.data.title ?? getDef(failedNode.data.defType).title} failed` : "Run failed"}</span>
              <span className="run-strip__meta">
                Show <CaretRightIcon size={11} weight="bold" />
              </span>
            </>
          )}
        </motion.button>
      )}
    </AnimatePresence>
  );
}

/* Results sheet ----------------------------------------------------------- */

const isRef = (v: unknown): v is FileRef => !!v && typeof v === "object" && typeof (v as FileRef).url === "string";
const filesOf = (v: OutputValue | undefined): FileRef[] => (isRef(v) ? [v] : Array.isArray(v) ? (v.filter(isRef) as FileRef[]) : []);
const hasValue = (v: OutputValue | undefined) => v !== undefined && v !== null && v !== "";

async function fetchFile(ref: FileRef): Promise<File | null> {
  try {
    const r = await fetch(ref.url);
    if (!r.ok) return null;
    const blob = await r.blob();
    const name = ref.name ?? ref.url.split("/").pop()?.split("?")[0] ?? "output";
    return new File([blob], name, { type: ref.mime || blob.type });
  } catch {
    return null;
  }
}

async function shareRef(ref: FileRef, title: string, setToast: (t: { text: string } | null) => void) {
  const nav = navigator as Navigator & { canShare?: (d: ShareData) => boolean };
  if (typeof nav.share !== "function") {
    try {
      await navigator.clipboard.writeText(ref.url);
      setToast({ text: "Link copied" });
    } catch {
      window.open(ref.url, "_blank", "noopener");
    }
    return;
  }
  const file = await fetchFile(ref);
  try {
    if (file && nav.canShare?.({ files: [file] })) await nav.share({ files: [file], title });
    else await nav.share({ title, url: ref.url });
  } catch {
    /* user dismissed */
  }
}

async function saveRef(ref: FileRef) {
  const file = await fetchFile(ref);
  if (!file) return window.open(ref.url, "_blank", "noopener");
  const url = URL.createObjectURL(file);
  const a = document.createElement("a");
  a.href = url;
  a.download = file.name;
  document.body.appendChild(a);
  a.click();
  a.remove();
  setTimeout(() => URL.revokeObjectURL(url), 10_000);
}

function ResultCard({ node }: { node: CanvasNode }) {
  const def = getDef(node.data.defType);
  const setToast = useCanvasStore((s) => s.setToast);
  const title = node.data.title ?? def.title;
  const ports = def.outputs.filter((p) => hasValue(node.data.outputs?.[p.id]));
  return (
    <section className="m-result">
      <h3 className="m-result__title">{title}</h3>
      {ports.map((p) => {
        const value = node.data.outputs?.[p.id];
        const files = filesOf(value);
        return (
          <div key={p.id} className="m-result__port">
            {ports.length > 1 && <div className="m-result__label">{p.label || p.id}</div>}
            <OutputView value={value} type={p.type} />
            {files.length > 0 && (
              <div className="m-result__actions">
                {files.slice(0, 4).map((f, i) => (
                  <span key={i} className="flex gap-1.5">
                    <Button size="sm" variant="secondary" icon={ShareNetworkIcon} onClick={() => void shareRef(f, title, setToast)}>
                      Share{files.length > 1 ? ` ${i + 1}` : ""}
                    </Button>
                    <Button size="sm" variant="ghost" icon={DownloadSimpleIcon} onClick={() => void saveRef(f)}>
                      Save
                    </Button>
                  </span>
                ))}
              </div>
            )}
            {files.length === 0 && typeof value === "string" && (
              <div className="m-result__actions">
                <Button
                  size="sm"
                  variant="secondary"
                  icon={ShareNetworkIcon}
                  onClick={() => {
                    if (typeof navigator.share === "function") void navigator.share({ title, text: value }).catch(() => undefined);
                    else void navigator.clipboard.writeText(value).then(() => setToast({ text: "Copied" }));
                  }}
                >
                  Share
                </Button>
              </div>
            )}
          </div>
        );
      })}
    </section>
  );
}

/** Every output of the last run, full width; final outputs first. */
export function ResultsView() {
  const nodes = useCanvasStore((s) => s.nodes);
  const edges = useCanvasStore((s) => s.edges);
  const order = useCanvasStore((s) => s.order);
  const running = useCanvasStore((s) => s.run.running);
  const enqueue = useCanvasStore((s) => s.enqueue);
  const setResultsOpen = useCanvasStore((s) => s.setResultsOpen);
  const items = useMemo(() => {
    const feeds = new Set(edges.map((e) => e.source));
    const rank = new Map(order.map((id, i) => [id, i]));
    return nodes
      .filter((n) => {
        const def = getDef(n.data.defType);
        return !def.emits && def.outputs.some((p) => hasValue(n.data.outputs?.[p.id]));
      })
      .sort((a, b) => Number(feeds.has(a.id)) - Number(feeds.has(b.id)) || (rank.get(b.id) ?? 0) - (rank.get(a.id) ?? 0));
  }, [nodes, edges, order]);

  if (items.length === 0)
    return (
      <div className="m-results__empty">
        <ImagesIcon size={28} className="text-kumo-placeholder" />
        <p className="text-sm text-kumo-subtle">{running ? "Running… results land here." : "No results yet."}</p>
        {!running && nodes.length > 0 && (
          <Button size="sm" variant="primary" icon={PlayIcon} onClick={() => enqueue()}>
            Run workflow
          </Button>
        )}
        {!running && nodes.length === 0 && (
          <Button size="sm" variant="primary" icon={PlusIcon} onClick={() => { setResultsOpen(false); useCanvasStore.getState().openPalette(null); }}>
            Add a node
          </Button>
        )}
      </div>
    );
  return (
    <div className="m-results">
      {items.map((n) => (
        <ResultCard key={n.id} node={n} />
      ))}
    </div>
  );
}

/* Toast -------------------------------------------------------------------- */

/** Bottom toast with an optional action ("Removed X · Undo"). */
export function ToastHost() {
  const toast = useCanvasStore((s) => s.toast);
  const setToast = useCanvasStore((s) => s.setToast);
  return (
    <AnimatePresence>
      {toast && (
        <motion.div
          key={toast.id}
          className="toast"
          role="status"
          initial={{ opacity: 0, y: 12, scale: 0.98 }}
          animate={{ opacity: 1, y: 0, scale: 1 }}
          exit={{ opacity: 0, y: 8, scale: 0.98, transition: { duration: 0.15 } }}
          transition={{ duration: 0.2, ease: [0.16, 1, 0.3, 1] }}
        >
          <span className="truncate">{toast.text}</span>
          {toast.action && (
            <button type="button" className="toast__act" onClick={toast.action.run}>
              {toast.action.label === "Undo" && <ArrowUUpLeftIcon size={13} weight="bold" />}
              {toast.action.label}
            </button>
          )}
          <button type="button" className="toast__close" aria-label="Dismiss" onClick={() => setToast(null)}>
            <XIcon size={12} weight="bold" />
          </button>
        </motion.div>
      )}
    </AnimatePresence>
  );
}