import os
import json
import time
from pathlib import Path
from google import genai
from google.genai import types

GEMINI_API_KEY = os.environ["GEMINI_API_KEY"]
client = genai.Client(api_key=GEMINI_API_KEY)

REFS = {
    "child": "kid-pilot.png",
    "zelie": "zelie.png",
    "garden": "fleur-chemin.png",
    "pots": "pot-fleeur.png",
    "road": "route-sombre.png",
}
PRENOM = "Leo"


def load_references():
    loaded = {}
    for name, path in REFS.items():
        if Path(path).exists():
            loaded[name] = Path(path).read_bytes()
            print(f"Reference chargee : {path}")
        else:
            loaded[name] = None
            print(f"Pas de reference : {path}")
    return loaded


def generate_page(page_data, style_master, refs, output_dir="pages_zelie"):
    Path(output_dir).mkdir(exist_ok=True)
    page_num = page_data["page"]
    page_type = page_data["type"]
    prompt = page_data["prompt"].replace("{prenom}", PRENOM)
    output_path = f"{output_dir}/page_{page_num:02d}.png"

    format_instruction = (
        "IMPORTANT: single full square illustration 2362x2362 pixels, no spread, no border, fills entire frame."
        if page_type == "simple"
        else "IMPORTANT: double page spread 4724x2362 pixels, 2:1 ratio, safe center fold, no spine line, fills entire frame."
    )

    full_prompt = style_master + " " + format_instruction + " Scene: " + prompt

    print(f"Page {page_num:02d}...")

    text = (
        "Use ALL reference images to maintain EXACT visual consistency across every scene. "
        f"Ref 1 - CHILD {PRENOM}: short brown hair, big dark eyes, rosy cheeks, brown leather aviator jacket with cream fur lining, green goggles on forehead, beige cargo pants, brown boots. Same face and outfit every scene. "
        "Ref 2 - ZELIE: yellow and black striped honeybee, iridescent wings, big brown eyes, green aviator goggles on head, fuzzy body. Same design every scene. "
        "Ref 3 - LE JARDIN FLEURI: lush colorful garden with giant sunflowers, red poppies, pink and purple flowers, warm sunlight, green path. Use for garden scenes. "
        "Ref 4 - LE POT DE FLEURS: colorful flower pots on stone walls in warm sunlight. Use when pots are featured. "
        "Ref 5 - LA ROUTE GRISE: dark asphalt road, gray bare trees, mist, dark sky, wilted plants. Use for road scenes. "
        "Now generate: " + full_prompt
    )

    parts = [types.Part(text=text)]
    for key in ["child", "zelie", "garden", "pots", "road"]:
        if refs.get(key):
            parts.append(types.Part(
                inline_data=types.Blob(data=refs[key], mime_type="image/png")
            ))

    response = client.models.generate_content(
        model="gemini-3-pro-image-preview",
        contents=parts,
        config=types.GenerateContentConfig(
            response_modalities=["IMAGE", "TEXT"]
        )
    )

    for part in response.candidates[0].content.parts:
        if part.inline_data:
            with open(output_path, "wb") as f:
                f.write(part.inline_data.data)
            print(f"OK : {output_path}")
            return output_path

    print(f"ERREUR page {page_num}")
    return None


def generate_book(prompts_file="prompts_zelie.json", start_page=1, end_page=None):
    with open(prompts_file, "r", encoding="utf-8") as f:
        data = json.load(f)

    style_master = data["style_master"]
    pages = data["pages"]

    if end_page:
        pages = [p for p in pages if start_page <= p["page"] <= end_page]
    else:
        pages = [p for p in pages if p["page"] >= start_page]

    refs = load_references()

    print(f"Generation : {len(pages)} pages — prenom : {PRENOM}")
    results = []

    for page_data in pages:
        path = generate_page(page_data, style_master, refs)
        results.append({
            "page": page_data["page"],
            "path": path,
            "success": path is not None
        })
        time.sleep(3)

    success = sum(1 for r in results if r["success"])
    print(f"\nTermine : {success}/{len(pages)} pages generees")

    with open("book_zelie_results.json", "w") as f:
        json.dump(results, f, indent=2)

    return results


if __name__ == "__main__":
    import sys
    prompts_file = sys.argv[1] if len(sys.argv) > 1 else "prompts_zelie.json"
    start = int(sys.argv[2]) if len(sys.argv) > 2 else 1
    end = int(sys.argv[3]) if len(sys.argv) > 3 else None
    generate_book(prompts_file, start, end)