import csv
import colorsys
import os 

def adjust_lightness(hex_val, factor):
    """Adjust the brightness based on a given hex color; the factor can be a positive or negative ratio."""
    hex_val = hex_val.lstrip('#')
    r, g, b = tuple(int(hex_val[i:i+2], 16) for i in (0, 2, 4))
    # Convert to HLS
    h, l, s = colorsys.rgb_to_hls(r/255.0, g/255.0, b/255.0)
    # Adjust brightness
    l = max(0, min(1, l + factor))
    r, g, b = colorsys.hls_to_rgb(h, l, s)
    return "#{:02X}{:02X}{:02X}".format(int(round(r*255)), int(round(g*255)), int(round(b*255)))

def merge_prompt_with_colors(prompt_file, color_file, output_file, variation=1, color_level=1, range_factor=0.1):
    # read prompt 
    with open(prompt_file, "r", encoding="utf-8") as f:
        reader = csv.DictReader(f)
        prompts = list(reader)

    # read color 
    with open(color_file, "r", encoding="utf-8") as f:
        reader = csv.DictReader(f)
        colors = list(reader)

    merged_rows = []
    id_counter = 1
    for prompt in prompts:
        prompt_text = prompt["prompt"]
        for color in colors:
            hex_val = color.get("hex") or color.get("color") or ""
            split_val = "test"
            merged_rows.append({
                "id": id_counter,
                "prompt": prompt_text,
                "color_target": hex_val,  # midpoint of the range
                "color_1": adjust_lightness(hex_val, -range_factor),  # lower limit
                "color_2": adjust_lightness(hex_val, +range_factor),  # upper limit
                "variation": variation,
                "color_level": color_level,
                "split": split_val,
                "color_format": "Hex code"
            })
            id_counter += 1

    
    output_dir = os.path.dirname(output_file) 
    if output_dir and not os.path.exists(output_dir): 
        os.makedirs(output_dir, exist_ok=True)
    # write CSV
    with open(output_file, "w", newline="", encoding="utf-8") as f:
        writer = csv.DictWriter(f, fieldnames=["id","prompt","color_target","color_1","color_2","variation","color_level","split","color_format"])
        writer.writeheader()
        writer.writerows(merged_rows)

    print(f"Generation complete: {output_file}")


merge_prompt_with_colors("raw_config/Variation_4.csv", "raw_config/Color_Level_1.csv", "metadata/Variation_4_Color_1.csv", variation=4, color_level=1) 
merge_prompt_with_colors("raw_config/Variation_4.csv", "raw_config/Color_Level_2.csv", "metadata/Variation_4_Color_2.csv", variation=4, color_level=2) 
merge_prompt_with_colors("raw_config/Variation_4.csv", "raw_config/Color_Level_3.csv", "metadata/Variation_4_Color_3.csv", variation=4, color_level=3)