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 = {
    "pipo": "pipo_perroquet.png",
    "parent": "pix_mom.png",
    "palace": "Hall_de_lumiere.png",
    "plaza": "place_couleur.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_pipo"):
    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. "
        "Ref 1 - PIPO THE PARROT: small round chubby green parrot, yellow face, orange beak, rainbow-colored wings, red bow-tie, big warm brown eyes. Same design every scene. "
        "Ref 2 - PARENT WOMAN: brown hair in updo bun, warm eyes, sage green knitted sweater over white shirt, blue jeans, brown ankle boots, gold heart necklace. Same design every scene. "
        "Ref 3 - LE PALAIS DES ECHOS: magical purple palace interior, grand staircases with golden railings, floating glowing letters and words, chandeliers, blue starry atmosphere. Use for palace scenes. "
        "Ref 4 - LA PLACE DES SOURIRES: cheerful colorful village square, flower-shaped fountains in pink orange and purple, colorful paving stones, bunting flags, cozy shops, blue sky. Use for plaza scenes. "
        f"CHILD CHARACTER {PRENOM}: short slightly wavy brown hair, big round brown eyes, rosy cheeks, blue denim overalls, yellow t-shirt, white sneakers. Same face and outfit every scene. "
        "Now generate: " + full_prompt
    )

    parts = [types.Part(text=text)]
    for key in ["pipo", "parent", "palace", "plaza"]:
        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_pipo.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_pipo_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_pipo.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)