import { normalizePublishPlatformIds } from "./publish-platforms";

export type CoverSupportMode = "native" | "unsupported";

export interface PlatformCoverRequirement {
  platformId: string;
  required: boolean;
  supportMode: CoverSupportMode;
  aspectRatio: number | null;
  aspectLabel: string | null;
  outputWidth: number | null;
  outputHeight: number | null;
  priority: number;
}

const defaultRequirement = {
  required: false,
  supportMode: "unsupported" as CoverSupportMode,
  aspectRatio: null,
  aspectLabel: null,
  outputWidth: null,
  outputHeight: null,
  priority: 0,
};

const requirementCatalog: Record<string, Partial<PlatformCoverRequirement>> = {
  baijiahao: {
    required: true,
    supportMode: "native",
    aspectRatio: 3 / 2,
    aspectLabel: "3:2",
    outputWidth: 1200,
    outputHeight: 800,
    priority: 100,
  },
  dongchedi: {
    required: true,
    supportMode: "native",
    aspectRatio: 4 / 3,
    aspectLabel: "4:3",
    outputWidth: 1200,
    outputHeight: 900,
    priority: 90,
  },
};

export function getPlatformCoverRequirements(platformIds?: Array<string | null | undefined>): PlatformCoverRequirement[] {
  return normalizePublishPlatformIds(platformIds).map((platformId) => {
    const config = requirementCatalog[platformId] ?? {};

    return {
      platformId,
      required: config.required ?? defaultRequirement.required,
      supportMode: config.supportMode ?? defaultRequirement.supportMode,
      aspectRatio: config.aspectRatio ?? defaultRequirement.aspectRatio,
      aspectLabel: config.aspectLabel ?? defaultRequirement.aspectLabel,
      outputWidth: config.outputWidth ?? defaultRequirement.outputWidth,
      outputHeight: config.outputHeight ?? defaultRequirement.outputHeight,
      priority: config.priority ?? defaultRequirement.priority,
    };
  });
}

export function coverUploadRequired(platformIds?: Array<string | null | undefined>): boolean {
  return getPlatformCoverRequirements(platformIds).some((item) => item.required);
}

export function getPrimaryCoverRequirement(platformIds?: Array<string | null | undefined>): PlatformCoverRequirement {
  const requirements = getPlatformCoverRequirements(platformIds);
  if (!requirements.length) {
    return {
      platformId: "default",
      ...defaultRequirement,
    };
  }

  return [...requirements].sort((left, right) => right.priority - left.priority)[0];
}

export function deriveCoverFileName(value?: string | null): string {
  const trimmed = String(value ?? "").trim();
  if (!trimmed) {
    return "";
  }

  try {
    const pathname = new URL(trimmed, "https://cover.local").pathname;
    const lastSegment = pathname.split("/").filter(Boolean).at(-1) ?? "";
    return decodeURIComponent(lastSegment);
  } catch {
    return "";
  }
}