'use strict';

// null = FLOOR (default), explicit values for special tiles
// Outer ring = WALL perimeter

const NORMAL_TEMPLATES = [
  // Empty room
  [
    [1, 1, 1, 1, 1],
    [1, null, null, null, 1],
    [1, null, null, null, 1],
    [1, null, null, null, 1],
    [1, 1, 1, 1, 1],
  ],
  // With rock
  [
    [1, 1, 1, 1, 1],
    [1, null, null, null, 1],
    [1, null, null, null, 1],
    [1, null, null, 11, 1],
    [1, 1, 1, 1, 1],
  ],
  // With softwall
  [
    [1, 1, 1, 1, 1],
    [1, null, null, null, 1],
    [1, null, 2, null, 1],
    [1, null, null, null, 1],
    [1, 1, 1, 1, 1],
  ],
  // Rock + torch
  [
    [1, 1, 1, 1, 1],
    [1, 5, null, null, 1],
    [1, null, null, null, 1],
    [1, null, null, 11, 1],
    [1, 1, 1, 1, 1],
  ],
];

const ENTRANCE_TEMPLATES = [
  // EXIT at bottom
  [
    [1, 1, 1, 1, 1],
    [1, null, null, null, 1],
    [1, null, 6, null, 1],
    [1, null, null, null, 1],
    [1, 1, 14, 1, 1],
  ],
  // EXIT at top
  [
    [1, 1, 14, 1, 1],
    [1, null, null, null, 1],
    [1, null, 6, null, 1],
    [1, null, null, null, 1],
    [1, 1, 1, 1, 1],
  ],
  // EXIT at left
  [
    [1, 1, 1, 1, 1],
    [14, null, null, null, 1],
    [1, null, null, 6, 1],
    [1, null, null, null, 1],
    [1, 1, 1, 1, 1],
  ],
  // EXIT at right
  [
    [1, 1, 1, 1, 1],
    [1, null, null, null, 14],
    [1, null, 6, null, 1],
    [1, null, null, null, 1],
    [1, 1, 1, 1, 1],
  ],
];

const BOSS_TEMPLATES = [
  // Open arena, corner torches, EXIT bottom center
  [
    [1, 1, 1, 1, 1, 1, 1],
    [1, 5, null, null, null, 5, 1],
    [1, null, null, null, null, null, 1],
    [1, null, null, null, null, null, 1],
    [1, null, null, null, null, null, 1],
    [1, 5, null, null, null, 5, 1],
    [1, 1, 1, 14, 1, 1, 1],
  ],
  // Arena with center softwall
  [
    [1, 1, 1, 1, 1, 1, 1],
    [1, 5, null, null, null, 5, 1],
    [1, null, null, null, null, null, 1],
    [1, null, null, 2, null, null, 1],
    [1, null, null, null, null, null, 1],
    [1, 5, null, null, null, 5, 1],
    [1, 1, 1, 14, 1, 1, 1],
  ],
  // Arena with two softwalls
  [
    [1, 1, 1, 1, 1, 1, 1],
    [1, 5, null, null, null, 5, 1],
    [1, null, null, 2, null, null, 1],
    [1, null, null, null, null, null, 1],
    [1, null, null, 2, null, null, 1],
    [1, 5, null, null, null, 5, 1],
    [1, 1, 1, 14, 1, 1, 1],
  ],
];

const TREASURE_TEMPLATES = [
  // Chest in center, clean
  [
    [1, 1, 1, 1, 1],
    [1, null, null, null, 1],
    [1, null, 12, null, 1],
    [1, null, null, null, 1],
    [1, 1, 1, 1, 1],
  ],
  // Chest with traps
  [
    [1, 1, 1, 1, 1],
    [1, 9, null, 9, 1],
    [1, null, 12, null, 1],
    [1, null, null, null, 1],
    [1, 1, 1, 1, 1],
  ],
  // Chest with traps + rock
  [
    [1, 1, 1, 1, 1],
    [1, 9, null, 9, 1],
    [1, null, 12, null, 1],
    [1, null, 11, null, 1],
    [1, 1, 1, 1, 1],
  ],
  // Chest surrounded by traps
  [
    [1, 1, 1, 1, 1],
    [1, 9, 9, 9, 1],
    [1, 9, 12, 9, 1],
    [1, 9, 9, 9, 1],
    [1, 1, 1, 1, 1],
  ],
];

const PUZZLE_TEMPLATES = [
  // Lever + target
  [
    [1, 1, 1, 1, 1, 1],
    [1, null, null, 7, null, 1],
    [1, null, null, null, null, 1],
    [1, null, null, null, null, 1],
    [1, null, 10, null, null, 1],
    [1, 1, 1, 1, 1, 1],
  ],
  // Rock + target
  [
    [1, 1, 1, 1, 1, 1],
    [1, null, null, null, 11, 1],
    [1, null, null, null, null, 1],
    [1, null, null, null, null, 1],
    [1, null, 10, null, null, 1],
    [1, 1, 1, 1, 1, 1],
  ],
  // Switch + target
  [
    [1, 1, 1, 1, 1, 1],
    [1, null, null, 8, null, 1],
    [1, null, null, null, null, 1],
    [1, null, null, null, null, 1],
    [1, null, 10, null, null, 1],
    [1, 1, 1, 1, 1, 1],
  ],
  // Two levers + target
  [
    [1, 1, 1, 1, 1, 1],
    [1, null, 7, null, null, 1],
    [1, null, null, null, null, 1],
    [1, null, null, null, null, 1],
    [1, null, 10, null, 7, 1],
    [1, 1, 1, 1, 1, 1],
  ],
];

const TRAP_TEMPLATES = [
  // 2 traps
  [
    [1, 1, 1, 1, 1],
    [1, null, 9, null, 1],
    [1, null, null, null, 1],
    [1, null, null, 9, 1],
    [1, 1, 1, 1, 1],
  ],
  // 3 traps
  [
    [1, 1, 1, 1, 1],
    [1, 9, null, null, 1],
    [1, null, 9, null, 1],
    [1, null, null, 9, 1],
    [1, 1, 1, 1, 1],
  ],
  // 4 traps
  [
    [1, 1, 1, 1, 1],
    [1, 9, null, null, 1],
    [1, null, null, null, 1],
    [1, null, null, 9, 1],
    [1, 1, 9, 9, 1],
  ],
  // Lava traps
  [
    [1, 1, 1, 1, 1],
    [1, null, 3, null, 1],
    [1, null, null, null, 1],
    [1, null, 3, null, 1],
    [1, 1, 1, 1, 1],
  ],
];

function getRoomLayoutTemplate(roomType, rng) {
  let templates;

  switch (roomType) {
    case 'entrance':
      templates = ENTRANCE_TEMPLATES;
      break;
    case 'boss':
      templates = BOSS_TEMPLATES;
      break;
    case 'treasure':
      templates = TREASURE_TEMPLATES;
      break;
    case 'puzzle':
      templates = PUZZLE_TEMPLATES;
      break;
    case 'trap':
      templates = TRAP_TEMPLATES;
      break;
    default:
      templates = NORMAL_TEMPLATES;
      break;
  }

  const idx = Math.floor(rng() * templates.length);
  return templates[idx].map(row => [...row]);
}

function generateRoomLayout(room, theme, rng) {
  const template = getRoomLayoutTemplate(room.type, rng);
  const tW = template[0].length;
  const tH = template.length;
  const rW = room.width;
  const rH = room.height;

  // Initialize room grid: walls on perimeter, floor inside
  const grid = [];
  for (let y = 0; y < rH; y++) {
    grid[y] = [];
    for (let x = 0; x < rW; x++) {
      if (y === 0 || y === rH - 1 || x === 0 || x === rW - 1) {
        grid[y][x] = TILE_TYPES.WALL;
      } else {
        grid[y][x] = TILE_TYPES.FLOOR;
      }
    }
  }

  // Map template tiles to room grid
  for (let ty = 0; ty < tH; ty++) {
    for (let tx = 0; tx < tW; tx++) {
      const tile = template[ty][tx];
      if (tile === null) continue;

      let rx, ry;

      // Interior tile
      if (ty > 0 && ty < tH - 1 && tx > 0 && tx < tW - 1) {
        rx = Math.round((tx - 1) * (rW - 2) / (tW - 2)) + 1;
        ry = Math.round((ty - 1) * (rH - 2) / (tH - 2)) + 1;
      }
      // Top edge
      else if (ty === 0 && tx > 0 && tx < tW - 1) {
        rx = Math.round((tx / (tW - 1)) * (rW - 1));
        ry = 0;
      }
      // Bottom edge
      else if (ty === tH - 1 && tx > 0 && tx < tW - 1) {
        rx = Math.round((tx / (tW - 1)) * (rW - 1));
        ry = rH - 1;
      }
      // Left edge
      else if (tx === 0 && ty > 0 && ty < tH - 1) {
        rx = 0;
        ry = Math.round((ty / (tH - 1)) * (rH - 1));
      }
      // Right edge
      else if (tx === tW - 1 && ty > 0 && ty < tH - 1) {
        rx = rW - 1;
        ry = Math.round((ty / (tH - 1)) * (rH - 1));
      }
      // Corners (wall overlaps, skip unless special)
      else {
        continue;
      }

      if (rx >= 0 && rx < rW && ry >= 0 && ry < rH) {
        grid[ry][rx] = tile;
      }
    }
  }

  // Add corner torches based on RNG
  if (rng() < 0.6) {
    grid[1][1] = TILE_TYPES.TORCH;
  }
  if (rng() < 0.4) {
    grid[1][rW - 2] = TILE_TYPES.TORCH;
  }
  if (rng() < 0.4) {
    grid[rH - 2][1] = TILE_TYPES.TORCH;
  }
  if (rng() < 0.6) {
    grid[rH - 2][rW - 2] = TILE_TYPES.TORCH;
  }

  // Add theme-appropriate floor decorations
  if (theme && theme.floorHazards) {
    for (const hazard of theme.floorHazards) {
      if (rng() < hazard.chance) {
        const hx = 1 + Math.floor(rng() * (rW - 2));
        const hy = 1 + Math.floor(rng() * (rH - 2));
        if (grid[hy][hx] === TILE_TYPES.FLOOR) {
          grid[hy][hx] = hazard.tileType;
        }
      }
    }
  }

  room.tiles = grid;
  applyThemeToRoom(room, theme);
  return grid;
}

function applyThemeToRoom(room, theme) {
  if (!theme) return;

  room.theme = theme;
  room.floorColor = theme.floorColor;
  room.floorDarkColor = theme.floorDarkColor;
  room.wallColor = theme.wallColor;
  room.wallTopColor = theme.wallTopColor;
  room.wallFrontColor = theme.wallFrontColor;
  room.wallBottomColor = theme.wallBottomColor;
  room.wallBorderColor = theme.wallBorderColor;

  for (const deco of room.decorations) {
    switch (deco.type) {
      case 'torch':
        deco.glowColor = theme.torchGlow;
        deco.stickColor = theme.torchStickColor;
        deco.flameColor = theme.torchFlameColor;
        deco.coreColor = theme.torchCoreColor;
        break;
      case 'rock':
        deco.color = theme.rockColor || '#888888';
        deco.darkColor = theme.rockDarkColor || '#666666';
        deco.lightColor = theme.rockLightColor || '#AAAAAA';
        break;
      case 'chest':
        deco.closedColor = theme.chestClosedColor || '#8B4513';
        deco.goldColor = theme.chestGoldColor || '#DAA520';
        deco.openColor = theme.chestOpenColor || '#A0522D';
        break;
      case 'lever':
        deco.color = theme.leverColor || '#B8860B';
        break;
      case 'switch':
        deco.color = theme.switchFloorColor || '#DAA520';
        break;
      case 'target':
        deco.color = theme.targetColor || '#FFD700';
        deco.glowColor = theme.targetGlow || 'rgba(255,215,0,0.3)';
        break;
      case 'trap':
        deco.color = theme.trapColor || '#8B008B';
        break;
      case 'lava':
        deco.color = theme.lavaColor || '#FF4500';
        deco.lightColor = theme.lavaLightColor || '#FF6347';
        break;
      case 'water':
        deco.color = theme.waterColor || '#4169AA';
        deco.lightColor = theme.waterLightColor || '#5F9EA0';
        break;
    }
  }
}

if (typeof module !== 'undefined' && module.exports) {
  module.exports = { generateRoomLayout, getRoomLayoutTemplate, applyThemeToRoom };
}