import type { CSSProperties } from "react";
import type { DividerBlockProps } from "@/features/editor/state/editorStore";

export interface DividerEscapers {
  escapeAttr: (value: string) => string;
}

export interface DividerExportTokens {
  style: string;
}

export const computeDividerExportTokens = (
  props: DividerBlockProps,
  escapers: DividerEscapers,
): DividerExportTokens => {
  const { escapeAttr } = escapers;

  const thickness = props.thickness === "medium" ? "2px" : "1px";
  const colorRaw = typeof props.colorHex === "string" ? props.colorHex.trim() : "";
  const color = colorRaw !== "" ? colorRaw : "#475569";
  const marginY = typeof props.marginYPx === "number" && props.marginYPx > 0 ? props.marginYPx : 16;
  const marginEm = pxToEm(marginY);

  const widthMode = props.widthMode ?? "full";
  const align = props.align ?? "left";

  const styleParts: string[] = [];
  styleParts.push("border:0");
  styleParts.push(`border-bottom:${thickness} solid ${escapeAttr(color)}`);
  styleParts.push(`margin:${marginEm} 0`);

  if (widthMode === "auto") {
    styleParts.push("width:50%");
  } else if (widthMode === "fixed") {
    const widthPx =
      typeof props.widthPx === "number" && props.widthPx > 0 ? props.widthPx : 320;
    styleParts.push(`width:${pxToEm(widthPx)}`);
  }

  if (widthMode === "auto" || widthMode === "fixed") {
    if (align === "center") {
      styleParts.push("margin-left:auto");
      styleParts.push("margin-right:auto");
    } else if (align === "right") {
      styleParts.push("margin-left:auto");
      styleParts.push("margin-right:0");
    }
  }

  const style = `${styleParts.join(";")};`;

  return { style };
};

export interface DividerEditorTokens {
  thicknessClass: string;
  innerWidthClass: string;
  widthPx?: number;
  borderColor: string;
  marginPx: number;
}

export const computeDividerEditorTokens = (props: DividerBlockProps): DividerEditorTokens => {
  const thicknessClass = props.thickness === "medium" ? "border-t-2" : "border-t";

  const colorRaw = typeof props.colorHex === "string" ? props.colorHex.trim() : "";
  const borderColor = colorRaw !== "" ? colorRaw : "#475569";

  const widthMode = props.widthMode ?? "full";
  let innerWidthClass = "w-full";
  let widthPx: number | undefined;

  if (widthMode === "auto") {
    innerWidthClass = "w-1/2";
  } else if (widthMode === "fixed") {
    innerWidthClass = "";
    if (typeof props.widthPx === "number" && props.widthPx > 0) {
      widthPx = props.widthPx;
    } else {
      widthPx = 320;
    }
  }

  const marginPx =
    typeof props.marginYPx === "number"
      ? props.marginYPx
      : props.marginY === "sm"
        ? 8
        : props.marginY === "lg"
          ? 24
          : 16;

  return {
    thicknessClass,
    innerWidthClass,
    widthPx,
    borderColor,
    marginPx,
  };
};

export interface DividerPublicTokens {
  alignClass: string;
  thicknessClass: string;
  innerWidthClass: string;
  wrapperMarginEm: string;
  innerStyle: CSSProperties;
  lineStyle: CSSProperties;
}

const pxToEm = (px: number, base = 16) => `${px / base}em`;

export const computeDividerPublicTokens = (props: DividerBlockProps): DividerPublicTokens => {
  const alignClass =
    props.align === "center"
      ? "items-center"
      : props.align === "right"
        ? "items-end"
        : "items-start";

  const thicknessClass = props.thickness === "medium" ? "h-[2px]" : "h-px";

  const marginPx =
    typeof props.marginYPx === "number"
      ? props.marginYPx
      : props.marginY === "sm"
        ? 8
        : props.marginY === "lg"
          ? 24
          : 16;
  const wrapperMarginEm = pxToEm(marginPx);

  const colorRaw = typeof props.colorHex === "string" ? props.colorHex.trim() : "";
  const backgroundColor = colorRaw !== "" ? colorRaw : "#475569";

  const widthMode = props.widthMode ?? "full";
  const innerStyle: CSSProperties = {};
  let innerWidthClass = "w-full";
  const lineStyle: CSSProperties = {
    backgroundColor,
  };

  if (widthMode === "auto") {
    innerWidthClass = "w-1/2";
  } else if (widthMode === "fixed") {
    innerWidthClass = "";
    innerStyle.width = "auto";

    if (typeof props.widthPx === "number" && props.widthPx > 0) {
      lineStyle.width = pxToEm(props.widthPx);
    } else {
      lineStyle.width = pxToEm(320);
    }
  }

  return {
    alignClass,
    thicknessClass,
    innerWidthClass,
    wrapperMarginEm,
    innerStyle,
    lineStyle,
  };
};