import type { SectionData, SectionPosition } from "../types/section.ts";
import type {
  BoardConfig,
  BoardData,
  CharacterPosition,
  FullBoard,
} from "../types/board.ts";
import { applyChange, createSection } from "./section.ts";
import type { BoardChange } from "../types/change.ts";

export function createBoard(config: BoardConfig): BoardData {
  const sections: SectionData[][] = Array(config.ySections)
    .fill(0)
    .map((_, sy) =>
      Array(config.xSections)
        .fill(0)
        .map((_, sx) => createSection({ sx, sy }, config))
    );

  return { config, sections };
}

export function locateSection(
  { x, y }: CharacterPosition,
  config: BoardConfig,
): SectionPosition {
  return {
    sx: Math.floor(x / config.sectionWidth),
    sy: Math.floor(y / config.sectionHeight),
  };
}

export function applyChangeOnBoard(change: BoardChange, board: BoardData) {
  const { sx, sy } = locateSection(change, board.config);
  const section = board.sections[sy][sx];
  applyChange(change, section);
}

export function renderFullBoard(data: BoardData): FullBoard {
  const totalLineCount = data.config.sectionHeight * data.config.ySections;
  const lineLength = data.config.sectionWidth * data.config.xSections;

  const chLines: string[][] = Array(totalLineCount);
  const colorLines: string[][] = Array(totalLineCount);
  const bgColorLines: string[][] = Array(totalLineCount);
  const widthLines: number[][] = Array(totalLineCount);

  for (let y = 0; y < totalLineCount; y++) {
    const chLine: string[] = [];
    const colorLine: string[] = [];
    const bgColorLine: string[] = [];
    const widthLine: number[] = [];

    let charsToSkip = 0;

    for (let x = 0; x < lineLength; x++) {
      if (charsToSkip > 0) {
        charsToSkip--;
        continue;
      }

      const { sx, sy } = locateSection({ x, y }, data.config);
      const section = data.sections[sy][sx];
      const xInSection = x % data.config.sectionWidth;
      const yInSection = y % data.config.sectionHeight;

      const cCh = section.ch[yInSection][xInSection];
      const cCo = section.color[yInSection][xInSection];
      const cBg = section.bgColor[yInSection][xInSection];
      const cWd = section.width[yInSection][xInSection];

      chLine.push(cCh);
      colorLine.push(cCo);
      bgColorLine.push(cBg);
      widthLine.push(cWd);
      charsToSkip += cWd - 1;
    }

    chLines[y] = chLine;
    colorLines[y] = colorLine;
    bgColorLines[y] = bgColorLine;
    widthLines[y] = widthLine;
  }

  return {
    w: lineLength,
    h: totalLineCount,
    ch: ([] as string[]).concat(...chLines).flat(),
    color: ([] as string[]).concat(...colorLines).flat(),
    bg_color: ([] as string[]).concat(...bgColorLines).flat(),
    width: ([] as number[]).concat(...widthLines).flat(),
  };
}