import random
import math

def generate_defold_map():
    width = 30
    height = 20
    
    # Defold/Tileset Indices (0-based)
    # 0: Grass
    # 1: Water
    # 2: Tall Grass
    # 3: Dense Grass
    
    cells = []
    
    for x in range(width):
        # River logic: Sine wave center
        # y goes from 0 (bottom) to height (top) in Defold usually? 
        # Actually Defold coords: (0,0) is bottom-left usually, but in Tilemap editor (0,0) is often bottom-left too.
        # Let's assume standard grid.
        
        river_center = 10 + int(3 * math.sin(x * 0.2))
        
        for y in range(height):
            tile_id = 0 # Default Grass
            
            # River check
            if y == river_center or y == river_center + 1:
                tile_id = 1 # Water
            else:
                # Random foliage on grass
                if random.random() < 0.10:
                    tile_id = random.choice([2, 3])
            
            # Append cell string
            # Defold tilemap cell format
            cell_str = f"""  cell {{
    x: {x}
    y: {y}
    tile: {tile_id}
    h_flip: 0
    v_flip: 0
  }}"""
            cells.append(cell_str)

    # Full file content
    content = f"""tile_set: "/main/ground.tilesource"
layers {{
  id: "ground"
  z: 0.0
  is_visible: 1
{chr(10).join(cells)}
}}
material: "/builtins/materials/tile_map.material"
blend_mode: BLEND_MODE_ALPHA
"""

    output_path = 'main/ground.tilemap'
    with open(output_path, 'w') as f:
        f.write(content)
        
    print(f"Generated Defold tilemap at {output_path}")

if __name__ == "__main__":
    generate_defold_map()