import type { SudokuBoard, SudokuCell } from './types';

export class SudokuRenderer {
  static renderBoard(container: HTMLElement, board: SudokuBoard): void {
    const sudokuDiv = document.createElement('div');
    sudokuDiv.id = 'sudoku';
    sudokuDiv.className = 'sudoku-board';

    for (let row = 0; row < 9; row++) {
      const rowDiv = document.createElement('div');
      rowDiv.className = 'sudoku-row';
      
      for (let col = 0; col < 9; col++) {
        const cell = board[row][col];
        const cellDiv = document.createElement('div');
        cellDiv.className = 'sudoku-cell';
        cellDiv.dataset.row = row.toString();
        cellDiv.dataset.col = col.toString();
        cellDiv.textContent = cell.value || '';

        if (cell.isGiven) {
          cellDiv.classList.add('given');
        }

        if (cell.hasConflict) {
          cellDiv.classList.add('conflict');
        }

        if (col === 2 || col === 5) {
          cellDiv.classList.add('border-right');
        }

        if (row === 2 || row === 5) {
          cellDiv.classList.add('border-bottom');
        }

        rowDiv.appendChild(cellDiv);
      }
      
      sudokuDiv.appendChild(rowDiv);
    }

    container.innerHTML = '';
    container.appendChild(sudokuDiv);
  }

  static renderEmptyBoard(container: HTMLElement): void {
    const emptyBoard: SudokuBoard = Array(9).fill(null).map(() =>
      Array(9).fill(null).map(() => ({
        value: '',
        isGiven: false,
        hasConflict: false
      }))
    );
    
    SudokuRenderer.renderBoard(container, emptyBoard);
  }

  static updateCell(container: HTMLElement, row: number, col: number, cell: SudokuCell): void {
    const cellEl = container.querySelector(`.sudoku-cell[data-row="${row}"][data-col="${col}"]`) as HTMLElement;
    if (!cellEl) return;

    cellEl.textContent = cell.value || '';
    cellEl.classList.toggle('given', cell.isGiven);
    cellEl.classList.toggle('conflict', cell.hasConflict);
  }

  static highlightCursor(container: HTMLElement, row: number, col: number, editMode: boolean): void {
    const cells = container.querySelectorAll('.sudoku-cell');
    cells.forEach(cell => cell.classList.remove('cursor', 'edit-mode'));

    const cursorCell = container.querySelector(`.sudoku-cell[data-row="${row}"][data-col="${col}"]`) as HTMLElement;
    if (cursorCell) {
      cursorCell.classList.add('cursor');
      if (editMode) {
        cursorCell.classList.add('edit-mode');
      }
    }
  }

  static flashCell(container: HTMLElement, row: number, col: number, className: string, duration: number = 300): void {
    const cellEl = container.querySelector(`.sudoku-cell[data-row="${row}"][data-col="${col}"]`) as HTMLElement;
    if (!cellEl) return;

    cellEl.classList.add(className);
    setTimeout(() => cellEl.classList.remove(className), duration);
  }

  static highlightConflicts(container: HTMLElement, conflictIndices: number[], duration: number = 2000): void {
    conflictIndices.forEach((idx) => {
      const row = Math.floor(idx / 9);
      const col = idx % 9;
      const cellEl = container.querySelector(`.sudoku-cell[data-row="${row}"][data-col="${col}"]`) as HTMLElement;
      if (cellEl) {
        cellEl.classList.add('conflict');
      }
    });

    setTimeout(() => {
      conflictIndices.forEach((idx) => {
        const row = Math.floor(idx / 9);
        const col = idx % 9;
        const cellEl = container.querySelector(`.sudoku-cell[data-row="${row}"][data-col="${col}"]`) as HTMLElement;
        if (cellEl) {
          cellEl.classList.remove('conflict');
        }
      });
    }, duration);
  }
}