import { Trans, useLingui } from "@lingui/react/macro";
import type {
  CaptionStylePreset,
  Edl,
  EdlCaptions,
  EdlError,
  EdlOverlay,
  MediaEditPlan,
} from "@rakazo/contracts";
import { Button, Skeleton } from "@rakazo/ui-web";
import { Plus, Save, Trash2 } from "lucide-react";
import { useCallback, useEffect, useMemo, useRef, useState } from "react";
import { LoadingState } from "../../components/ai/primitives";
import { ErrorLine, errorMessage, ViewHeader } from "../../components/media/editor/chrome";
import {
  NumberField,
  SecondsField,
  SelectField,
  TextField,
  ToggleField,
} from "../../components/media/editor/fields";
import type { PlayerHandle } from "../../components/media/editor/Player";
import { SourcePlayer } from "../../components/media/editor/Player";
import type { TimelineSelection } from "../../components/media/editor/Timeline";
import { Timeline } from "../../components/media/editor/Timeline";
import {
  errorTarget,
  formatMs,
  mainProgramMs,
  nextId,
  updateOverlay,
} from "../../components/media/editor/timeline";
import { rpc } from "../../lib/rpc";
import type { MediaViewProps } from "./nav";

interface Loaded {
  plan: MediaEditPlan;
  assetDurations: Map<string, number | null>;
  captionPresets: CaptionStylePreset[];
}

/** Timeline editor for one plan version. Saving submits a new version. */
export function EditorView({
  navigate,
  projectId,
  planId,
}: MediaViewProps & { projectId: string; planId: string }) {
  const { t } = useLingui();
  const [loaded, setLoaded] = useState<Loaded | null>(null);
  const [edl, setEdl] = useState<Edl | null>(null);
  const [dirty, setDirty] = useState(false);
  const [selection, setSelection] = useState<TimelineSelection>(null);
  const [errors, setErrors] = useState<EdlError[]>([]);
  const [playheadMs, setPlayheadMs] = useState(0);
  const [saving, setSaving] = useState(false);
  const [loadError, setLoadError] = useState<string | null>(null);
  const player = useRef<PlayerHandle>(null);

  useEffect(() => {
    let live = true;
    setLoaded(null);
    setEdl(null);
    setDirty(false);
    setErrors([]);
    setSelection(null);
    void (async () => {
      try {
        const { project, plans } = await rpc.media.projects.get({ projectId });
        const plan = plans.find((candidate) => candidate.id === planId);
        if (!plan) throw new Error(t`This plan no longer exists.`);
        const assetIds = [...new Set(plan.edl.tracks.video.map((clip) => clip.assetId))];
        const [assets, kits] = await Promise.all([
          Promise.all(
            assetIds.map((assetId) =>
              rpc.media.assets
                .get({ assetId })
                .then(({ asset }) => [assetId, asset.durationMs] as const)
                .catch(() => [assetId, null] as const),
            ),
          ),
          project.brandKitId ? rpc.media.brandKits.list({}) : Promise.resolve([]),
        ]);
        if (!live) return;
        const kit = kits.find((record) => record.id === project.brandKitId);
        setLoaded({
          plan,
          assetDurations: new Map(assets),
          captionPresets: kit?.kit.captionPresets ?? [],
        });
        setEdl(plan.edl);
      } catch (cause) {
        if (live) setLoadError(errorMessage(cause));
      }
    })();
    return () => {
      live = false;
    };
  }, [projectId, planId]);

  const change = useCallback((next: Edl) => {
    setEdl(next);
    setDirty(true);
  }, []);

  const invalid = useMemo(() => {
    const ids = new Set<string>();
    if (!edl) return ids;
    for (const error of errors) {
      const target = errorTarget(edl, error);
      if (target) ids.add(target.id);
    }
    return ids;
  }, [edl, errors]);

  if (!loaded || !edl) {
    return (
      <div className="flex flex-col gap-4 p-4">
        <ErrorLine error={loadError} />
        {loadError ? null : <Skeleton className="h-64 w-full" />}
      </div>
    );
  }

  async function save() {
    if (!edl) return;
    setSaving(true);
    try {
      const result = await rpc.media.plans.submit({ projectId, edl, rationale: null });
      if (result.ok) {
        setErrors([]);
        setDirty(false);
        navigate({ name: "editor", projectId, planId: result.plan.id });
      } else {
        setErrors(result.errors);
      }
    } catch (cause) {
      setErrors([{ code: "schema", path: "", message: errorMessage(cause) }]);
    } finally {
      setSaving(false);
    }
  }

  function addOverlay() {
    if (!edl) return;
    const id = nextId(edl, "text");
    const atMs = Math.max(0, Math.min(playheadMs, mainProgramMs(edl)));
    const overlay: EdlOverlay = { id, kind: "text", atMs, durationMs: 2000, text: "" };
    change({ ...edl, overlays: [...edl.overlays, overlay] });
    setSelection({ kind: "overlay", id });
  }

  return (
    <div className="flex flex-col gap-4 p-4" data-testid="media-editor">
      <ViewHeader
        title={`${loaded.plan.profileId} · v${loaded.plan.version}`}
        backLabel={t`Back to project`}
        onBack={() => navigate({ name: "project", projectId })}
      >
        <Button size="sm" disabled={!dirty || saving} onClick={save}>
          {saving ? (
            <LoadingState label={t`Saving`} />
          ) : (
            <>
              <Save />
              <Trans>Save</Trans>
            </>
          )}
        </Button>
      </ViewHeader>

      <div className="mx-auto w-full max-w-2xl">
        <SourcePlayer
          edl={edl}
          handleRef={player}
          label={t`Plan preview`}
          onFrame={(frame) => {
            if (frame) setPlayheadMs(frame.outputMs);
          }}
        />
      </div>

      <div className="flex items-center gap-2">
        <span className="flex-1 font-mono text-ui-body-sm tabular-nums text-muted-foreground">
          {formatMs(playheadMs)}
        </span>
        <Button variant="outline" size="sm" onClick={addOverlay}>
          <Plus />
          <Trans>Text</Trans>
        </Button>
      </div>

      <Timeline
        edl={edl}
        assetDurations={loaded.assetDurations}
        selection={selection}
        invalid={invalid}
        playheadMs={playheadMs}
        onSelect={setSelection}
        onSeek={(ms) => {
          setPlayheadMs(ms);
          player.current?.seek(ms);
        }}
        onChange={change}
      />

      {errors.length > 0 ? (
        <ul role="alert" className="flex flex-col gap-1" data-testid="media-edl-errors">
          {errors.map((error) => {
            const target = errorTarget(edl, error);
            return (
              <li key={`${error.code}-${error.path}-${error.message}`}>
                <button
                  type="button"
                  disabled={!target}
                  onClick={() => target && setSelection(target)}
                  className="text-left text-ui-body-sm text-destructive enabled:hover:underline"
                >
                  {error.message}
                </button>
              </li>
            );
          })}
        </ul>
      ) : null}

      <Inspector
        edl={edl}
        selection={selection}
        assetDurations={loaded.assetDurations}
        captionPresets={loaded.captionPresets}
        onChange={change}
        onClear={() => setSelection(null)}
      />
    </div>
  );
}

function Inspector({
  edl,
  selection,
  assetDurations,
  captionPresets,
  onChange,
  onClear,
}: {
  edl: Edl;
  selection: TimelineSelection;
  assetDurations: ReadonlyMap<string, number | null>;
  captionPresets: CaptionStylePreset[];
  onChange: (edl: Edl) => void;
  onClear: () => void;
}) {
  const { t } = useLingui();
  if (!selection) return null;

  if (selection.kind === "clip") {
    const clip = edl.tracks.video.find((candidate) => candidate.id === selection.id);
    if (!clip) return null;
    const max = assetDurations.get(clip.assetId) ?? Number.POSITIVE_INFINITY;
    const patch = (next: Partial<typeof clip>) =>
      onChange({
        ...edl,
        tracks: {
          ...edl.tracks,
          video: edl.tracks.video.map((candidate) =>
            candidate.id === clip.id ? { ...candidate, ...next } : candidate,
          ),
        },
      });
    return (
      <section className="grid grid-cols-2 gap-3 sm:grid-cols-4" data-testid="media-inspector">
        <SecondsField label={t`Start`} ms={clip.atMs} onChange={(atMs) => patch({ atMs })} />
        <SecondsField
          label={t`In`}
          ms={clip.inMs}
          onChange={(inMs) => patch({ inMs: Math.min(inMs, clip.outMs - 100) })}
        />
        <SecondsField
          label={t`Out`}
          ms={clip.outMs}
          onChange={(outMs) => patch({ outMs: Math.min(max, Math.max(outMs, clip.inMs + 100)) })}
        />
        <NumberField
          label={t`Speed`}
          value={clip.speed}
          min={0.25}
          max={4}
          step={0.25}
          onChange={(speed) => patch({ speed })}
        />
        <SelectField
          label={t`Framing`}
          value={Array.isArray(clip.reframe) ? "keyframes" : clip.reframe}
          options={[
            { value: "auto", label: t`Follow subject` },
            { value: "none", label: t`Center` },
            ...(Array.isArray(clip.reframe)
              ? [{ value: "keyframes" as const, label: t`Keyframes` }]
              : []),
          ]}
          onChange={(value) => {
            if (value !== "keyframes") patch({ reframe: value });
          }}
        />
        <ToggleField label={t`Mute`} checked={clip.muted} onChange={(muted) => patch({ muted })} />
        {edl.tracks.video.length > 1 ? (
          <Button
            variant="ghost"
            size="sm"
            className="self-end"
            onClick={() => {
              onChange({
                ...edl,
                tracks: {
                  ...edl.tracks,
                  video: edl.tracks.video.filter((candidate) => candidate.id !== clip.id),
                },
                transitions: edl.transitions.filter(
                  (transition) =>
                    transition.fromClipId !== clip.id && transition.toClipId !== clip.id,
                ),
                redactions: {
                  ...edl.redactions,
                  regions: edl.redactions.regions.filter((region) => region.clipId !== clip.id),
                },
              });
              onClear();
            }}
          >
            <Trash2 />
            <Trans>Remove</Trans>
          </Button>
        ) : null}
      </section>
    );
  }

  if (selection.kind === "overlay") {
    const overlay = edl.overlays.find((candidate) => candidate.id === selection.id);
    if (!overlay) return null;
    const patch = (next: Partial<EdlOverlay>) => onChange(updateOverlay(edl, overlay.id, next));
    return (
      <section className="grid grid-cols-2 gap-3 sm:grid-cols-4" data-testid="media-inspector">
        <SelectField
          label={t`Kind`}
          value={overlay.kind}
          options={[
            { value: "text", label: t`Text` },
            { value: "lower_third", label: t`Lower third` },
            { value: "logo", label: t`Logo` },
            { value: "watermark", label: t`Watermark` },
            { value: "cta_end_card", label: t`End card` },
            { value: "progress_bar", label: t`Progress bar` },
            ...(overlay.kind === "motion" ? [{ value: "motion" as const, label: t`Motion` }] : []),
          ]}
          onChange={(kind) => patch({ kind })}
        />
        <TextField
          label={t`Text`}
          value={overlay.text ?? ""}
          maxLength={200}
          onChange={(text) => patch({ text })}
        />
        <SecondsField label={t`Start`} ms={overlay.atMs} onChange={(atMs) => patch({ atMs })} />
        <SecondsField
          label={t`Duration`}
          ms={overlay.durationMs}
          min={100}
          onChange={(durationMs) => patch({ durationMs })}
        />
        <Button
          variant="ghost"
          size="sm"
          className="self-end"
          onClick={() => {
            onChange({
              ...edl,
              overlays: edl.overlays.filter((candidate) => candidate.id !== overlay.id),
            });
            onClear();
          }}
        >
          <Trash2 />
          <Trans>Remove</Trans>
        </Button>
      </section>
    );
  }

  const captions: EdlCaptions = edl.captions ?? {
    mode: "none",
    maxCharsPerLine: 32,
    wordHighlight: false,
    position: "lower",
  };
  const patch = (next: Partial<EdlCaptions>) =>
    onChange({ ...edl, captions: { ...captions, ...next } });
  return (
    <section className="grid grid-cols-2 gap-3 sm:grid-cols-4" data-testid="media-inspector">
      <SelectField
        label={t`Captions`}
        value={captions.mode}
        options={[
          { value: "burned", label: t`In video` },
          { value: "sidecar", label: t`Subtitle file` },
          { value: "both", label: t`Both` },
          { value: "none", label: t`Off` },
        ]}
        onChange={(mode) => patch({ mode })}
      />
      {captions.mode === "none" ? null : (
        <>
          <SelectField
            label={t`Position`}
            value={captions.position}
            options={[
              { value: "upper", label: t`Top` },
              { value: "middle", label: t`Middle` },
              { value: "lower", label: t`Bottom` },
            ]}
            onChange={(position) => patch({ position })}
          />
          <NumberField
            label={t`Characters per line`}
            value={captions.maxCharsPerLine}
            min={10}
            max={60}
            onChange={(maxCharsPerLine) => patch({ maxCharsPerLine })}
          />
          {captionPresets.length > 0 ? (
            <SelectField
              label={t`Style`}
              value={captions.presetId ?? ""}
              options={[
                { value: "", label: t`Default` },
                ...captionPresets.map((preset) => ({ value: preset.id, label: preset.name })),
              ]}
              onChange={(presetId) => patch({ presetId: presetId || undefined })}
            />
          ) : null}
          <ToggleField
            label={t`Highlight words`}
            checked={captions.wordHighlight}
            onChange={(wordHighlight) => patch({ wordHighlight })}
          />
        </>
      )}
    </section>
  );
}