import type { VideoCanvasEffectPreset } from "@/lib/video-canvas/config";

export type VideoCanvasAttachedEffect = Pick<
  VideoCanvasEffectPreset,
  | "author"
  | "commercial"
  | "id"
  | "model"
  | "prompt"
  | "thumbnailUrl"
  | "title"
>;

function isRecord(value: unknown): value is Record<string, unknown> {
  return Boolean(value) && typeof value === "object" && !Array.isArray(value);
}

function readString(record: Record<string, unknown>, key: string) {
  return typeof record[key] === "string" ? record[key].trim() : "";
}

export function toVideoCanvasAttachedEffect(
  preset: VideoCanvasEffectPreset,
): VideoCanvasAttachedEffect {
  return {
    author: preset.author,
    commercial: preset.commercial,
    id: preset.id,
    model: preset.model,
    prompt: preset.prompt,
    thumbnailUrl: preset.thumbnailUrl,
    title: preset.title,
  };
}

export function getVideoCanvasAttachedEffect(
  draftValues: Record<string, unknown> | null | undefined,
): VideoCanvasAttachedEffect | null {
  if (!draftValues) return null;
  const params = isRecord(draftValues.params) ? draftValues.params : {};
  const paramsEffect = Array.isArray(params.effects) && isRecord(params.effects[0])
    ? params.effects[0]
    : null;
  const source = isRecord(draftValues.videoEffect)
    ? draftValues.videoEffect
    : paramsEffect;
  if (!source) return null;

  const id = readString(source, "id");
  const title = readString(source, "title");
  const thumbnailUrl = readString(source, "thumbnailUrl");
  if (!id || !title || !thumbnailUrl) return null;

  return {
    author: readString(source, "author"),
    commercial: source.commercial !== false,
    id,
    model: readString(source, "model"),
    prompt: readString(source, "prompt"),
    thumbnailUrl,
    title,
  };
}

export function setVideoCanvasAttachedEffect(
  draftValues: Record<string, unknown> | null | undefined,
  preset: VideoCanvasEffectPreset | null,
) {
  const current = { ...(draftValues || {}) };
  const params = isRecord(current.params) ? current.params : {};

  if (preset) {
    const effect = toVideoCanvasAttachedEffect(preset);
    return {
      ...current,
      params: {
        ...params,
        effects: [effect],
      },
      videoEffect: effect,
    };
  }

  const { videoEffect: _removedEffect, ...nextDraftValues } = current;
  const { effects: _removedEffects, ...nextParams } = params;
  return {
    ...nextDraftValues,
    params: nextParams,
  };
}

function normalizeSearchText(value: unknown) {
  return String(value || "")
    .normalize("NFKC")
    .toLocaleLowerCase()
    .replace(/[\s\p{P}\p{S}]+/gu, "");
}

function getSearchFragments(query: string) {
  const characters = Array.from(query);
  const fragments = new Set<string>(characters);
  for (let index = 0; index < characters.length - 1; index += 1) {
    fragments.add(`${characters[index]}${characters[index + 1]}`);
  }
  return Array.from(fragments).filter(Boolean);
}

function getWeightedSearchKeywords(value: string) {
  return String(value || "")
    .split(/[,，;；\n]+/)
    .map((item) => {
      const match = item.trim().match(/^(.*?)(?::(\d{1,3}))?$/);
      const keyword = normalizeSearchText(match?.[1]);
      const weight = Math.max(1, Math.min(100, Number(match?.[2]) || 1));
      return keyword ? { keyword, weight } : null;
    })
    .filter((item): item is { keyword: string; weight: number } => Boolean(item));
}

export function rankVideoCanvasEffectPresets(
  presets: VideoCanvasEffectPreset[],
  query: string,
) {
  const normalizedQuery = normalizeSearchText(query);
  if (!normalizedQuery) return [...presets];
  const fragments = getSearchFragments(normalizedQuery);

  return presets
    .map((preset, index) => {
      const title = normalizeSearchText(preset.title);
      const author = normalizeSearchText(preset.author);
      const weightedKeywords = getWeightedSearchKeywords(preset.searchKeywords);
      const keywords = weightedKeywords.map((item) => item.keyword).join("");
      const prompt = normalizeSearchText(preset.prompt);
      let score = 0;

      if (title === normalizedQuery) score += 20_000;
      else if (title.includes(normalizedQuery)) score += 10_000;
      if (author.includes(normalizedQuery)) score += 6000;
      if (keywords.includes(normalizedQuery)) score += 4000;
      if (prompt.includes(normalizedQuery)) score += 2500;

      for (const item of weightedKeywords) {
        if (
          item.keyword.includes(normalizedQuery) ||
          normalizedQuery.includes(item.keyword)
        ) {
          score += item.weight * 100;
        }
      }

      for (const fragment of fragments) {
        const weight = Array.from(fragment).length > 1 ? 80 : 12;
        if (title.includes(fragment)) score += weight * 5;
        if (keywords.includes(fragment)) score += weight * 3;
        if (prompt.includes(fragment)) score += weight;
        if (author.includes(fragment)) score += weight;
      }

      return { index, preset, score };
    })
    .sort((left, right) => right.score - left.score || left.index - right.index)
    .map(({ preset }) => preset);
}