import type { Race } from "../api";

export type RaceVisualVariant = "short" | "half" | "marathon" | "trail" | "night";
export type RaceVisualFit = "cover" | "contain";

interface RaceVisual {
  variant: RaceVisualVariant;
  imageSrc: string;
  fallbackSrc: string;
  imageFit: RaceVisualFit;
  label: string;
}

const FALLBACK_VISUALS: Record<RaceVisualVariant, RaceVisual> = {
  short: {
    variant: "short",
    imageSrc: "/images/race-short.jpg",
    fallbackSrc: "/images/race-short.jpg",
    imageFit: "cover",
    label: "Городской темп",
  },
  half: {
    variant: "half",
    imageSrc: "/images/race-half.jpg",
    fallbackSrc: "/images/race-half.jpg",
    imageFit: "cover",
    label: "Полумарафон",
  },
  marathon: {
    variant: "marathon",
    imageSrc: "/images/race-marathon.jpg",
    fallbackSrc: "/images/race-marathon.jpg",
    imageFit: "cover",
    label: "Марафон",
  },
  trail: {
    variant: "trail",
    imageSrc: "/images/race-trail.jpg",
    fallbackSrc: "/images/race-trail.jpg",
    imageFit: "cover",
    label: "Трейл",
  },
  night: {
    variant: "night",
    imageSrc: "/images/race-night.jpg",
    fallbackSrc: "/images/race-night.jpg",
    imageFit: "cover",
    label: "Ночной старт",
  },
};

function getFallbackRaceVisual(race: Race): RaceVisual {
  const title = race.title.toLowerCase();

  if (title.includes("ночной")) {
    return FALLBACK_VISUALS.night;
  }

  if (
    title.includes("trail") ||
    title.includes("extreme") ||
    title.includes("suvorov") ||
    title.includes("трейл") ||
    title.includes("экстрим")
  ) {
    return FALLBACK_VISUALS.trail;
  }

  if (Math.abs(race.distanceKm - 42.2) < 0.8) {
    return FALLBACK_VISUALS.marathon;
  }

  if (Math.abs(race.distanceKm - 21.1) < 0.4) {
    return FALLBACK_VISUALS.half;
  }

  return FALLBACK_VISUALS.short;
}

export function getRaceVisual(race: Race): RaceVisual {
  const fallback = getFallbackRaceVisual(race);

  if (race.coverImageUrl) {
    return {
      ...fallback,
      imageSrc: race.coverImageUrl,
      fallbackSrc: fallback.imageSrc,
    };
  }

  return fallback;
}