import os
import requests
import json
import gradio as gr
from openai import OpenAI
import uuid
import time
import io
import yaml
import random
import traceback
import tempfile
from PIL import Image
from PIL.PngImagePlugin import PngInfo
from huggingface_hub import InferenceClient
from google import genai
from google.genai import types
from .config import (
    GEMINI_API_KEY, OLLAMA_HOST, OLLAMA_PORT, COMFY_URL, 
    COMFY_WORKFLOW_FILE, PROMPTS_FILE, HF_TOKEN, HF_BASE_URL,
    HF_TEXT_MODEL, HF_IMAGE_MODEL, GEMINI_TEXT_MODEL, 
    GEMINI_IMAGE_MODEL
)

# Setup Gemini
client = None
gemini_active = False
if GEMINI_API_KEY:
    try:
        client = genai.Client(api_key=GEMINI_API_KEY)
        gemini_active = True
    except Exception as e:
        print(f"Error initializing Gemini: {e}")

# Setup Hugging Face Router
hf_client = None
if HF_TOKEN:
    try:
        hf_client = OpenAI(
            base_url=HF_BASE_URL,
            api_key=HF_TOKEN,
        )
    except Exception as e:
        print(f"Error initializing HF Client: {e}")

def load_system_prompt(key="refinement"):
    """Loads a system prompt from prompts.yaml."""
    try:
        with open(PROMPTS_FILE, "r") as f:
            prompts = yaml.safe_load(f)
            return prompts.get(key, {}).get("system_instructions", "")
    except Exception as e:
        print(f"Error loading system prompt: {e}")
        return ""

def get_ollama_models():
    """Fetches available models from Ollama server and checks if it's running."""
    url = f"http://{OLLAMA_HOST}:{OLLAMA_PORT}/api/tags"
    try:
        response = requests.get(url, timeout=2)
        if response.status_code == 200:
            models = response.json().get("models", [])
            return [m["name"] for m in models]
        return []
    except Exception:
        return []

def check_comfy_availability():
    """Checks if ComfyUI is running by pinging the URL."""
    try:
        response = requests.get(f"{COMFY_URL}/system_stats", timeout=2)
        return response.status_code == 200
    except Exception:
        return False

def refine_with_gemini(prompt, mode="refinement"):
    if not gemini_active:
        return "Gemini API key not found in .env file."
    
    system_prompt = load_system_prompt(mode)
    if not system_prompt:
        system_prompt = (
            "You are an expert prompt engineer for AI image generators. "
            "Your task is to take the provided technical prompt and refine it into a more vivid, "
            "artistic, and detailed description while maintaining all the core features."
        )
    
    try:
        response = client.models.generate_content(
            model=GEMINI_TEXT_MODEL,
            config=types.GenerateContentConfig(
                system_instruction=system_prompt,
                temperature=0.7,
            ),
            contents=[prompt]
        )
        return response.text.strip()
    except Exception as e:
        print(f"Gemini Refinement Error: {e}")
        traceback.print_exc()
        return None

def refine_with_ollama(prompt, model, mode="refinement"):
    """Refines the prompt using a local Ollama instance."""
    system_prompt = load_system_prompt(mode)
    url = f"http://{OLLAMA_HOST}:{OLLAMA_PORT}/api/generate"
    
    payload = {
        "model": model,
        "prompt": f"{system_prompt}\n\nOriginal Prompt: {prompt}",
        "stream": False
    }
    
    try:
        response = requests.post(url, json=payload)
        response.raise_for_status()
        text = response.json().get("response", "").strip()
        # Clean up potential markdown
        if text.startswith("```"):
            lines = text.splitlines()
            if lines[0].startswith("```"): lines = lines[1:]
            if lines and lines[-1].startswith("```"): lines = lines[:-1]
            text = "\n".join(lines).strip()
        return text
    except Exception as e:
        print(f"Ollama Refinement Error: {e}")
        return None

def refine_with_hf(prompt, model_id=None, provider=None, token=None, mode="refinement"):
    """Refines the prompt using Hugging Face Router (OpenAI compatible)."""
    active_client = hf_client
    
    # If a manual token is provided, create a temporary client
    if token:
        try:
            active_client = OpenAI(
                base_url=HF_BASE_URL,
                api_key=token,
            )
        except Exception as e:
            return f"Error initializing manual HF Client: {e}"
            
    if not active_client:
        return "Error: Hugging Face token not found. Please log in or provide a token."
    
    system_prompt = load_system_prompt(mode)
    active_model = model_id if model_id else HF_TEXT_MODEL
    active_provider = provider if provider and provider.strip() else "auto"
    
    try:
        messages = [
            {"role": "system", "content": system_prompt},
            {"role": "user", "content": f"Original Prompt: {prompt}"}
        ]
        
        # Note: Provider for Chat Completions is currently handled by the route or specific model naming conventions.
        # But we pass it if the client supports it or for future use.
        response = active_client.chat.completions.create(
            model=active_model,
            messages=messages,
            max_tokens=500,
            temperature=0.7,
            extra_body={"provider": active_provider}
        )
        return response.choices[0].message.content.strip()
    except Exception as e:
        print(f"HF Refinement Error: {e}")
        return None

def refine_master(prompt, backend, ollama_model, hf_text_model, hf_text_provider, manual_token=None, character_name=None):
    """Routes prompt refinement to the selected backend."""
    if not prompt.strip():
        return ""
    
    # Prioritizes manual token
    hf_token = manual_token.strip() if manual_token and manual_token.strip() else None
    
    if backend == "Ollama (Local)":
        result = refine_with_ollama(prompt, ollama_model, mode="refinement")
    elif backend == "Hugging Face (Cloud)":
        result = refine_with_hf(prompt, hf_text_model, hf_text_provider, hf_token, mode="refinement")
    else:
        result = refine_with_gemini(prompt, mode="refinement")
    
    if result is None:
        return gr.update(), f"⚠️ Refinement failed. Check console for details. Original prompt preserved."
    
    return result, ""

def generate_name_master(prompt, backend, ollama_model, hf_text_model, hf_text_provider, manual_token=None):
    """Generates a thematic name based on the current prompt context."""
    if not prompt.strip():
        return "Unnamed Hero"
    
    hf_token = manual_token.strip() if manual_token and manual_token.strip() else None
    
    if backend == "Ollama (Local)":
        result = refine_with_ollama(prompt, ollama_model, mode="naming")
    elif backend == "Hugging Face (Cloud)":
        result = refine_with_hf(prompt, hf_text_model, hf_text_provider, hf_token, mode="naming")
    else:
        result = refine_with_gemini(prompt, mode="naming")
    
    return result if result else "Unnamed Hero"

def generate_image_with_gemini(refined_prompt, technical_prompt, aspect_ratio, character_name="Unnamed Hero"):
    if not gemini_active:
        return None, None, "Gemini API key not found in .env file."
    
    final_prompt = refined_prompt.strip() if refined_prompt and refined_prompt.strip() else technical_prompt.strip()
    
    if not final_prompt:
        return None, None, "No prompt available for generation."
    
    try:
        response = client.models.generate_images(
            model=GEMINI_IMAGE_MODEL,
            prompt=final_prompt,
            config=types.GenerateImagesConfig(
                aspect_ratio=aspect_ratio,
                output_mime_type='image/png'
            )
        )
        if response.generated_images:
            img = Image.open(io.BytesIO(response.generated_images[0].image.image_bytes))
            
            # Embed metadata
            metadata = PngInfo()
            metadata.add_text("Comment", final_prompt)
            metadata.add_text("CharacterName", character_name)
            
            safe_name = "".join([c if c.isalnum() else "_" for c in character_name]).strip("_")
            filename = f"{safe_name}_portrait_gemini.png" if safe_name else "rpg_portrait_gemini.png"
            
            temp_dir = tempfile.mkdtemp()
            img_path = os.path.join(temp_dir, filename)
            img.save(img_path, "PNG", pnginfo=metadata)
            return img, img_path, f"Image generated using {'refined' if refined_prompt.strip() else 'technical'} prompt!"
        return None, None, "Gemini Image generation did not return any images."
    except Exception as e:
        traceback.print_exc()
        return None, None, f"Image Generation Error: {e}"

def generate_image_with_comfy(prompt, aspect_ratio, character_name="Unnamed Hero"):
    """Generates an image using a local ComfyUI instance."""
    if not os.path.exists(COMFY_WORKFLOW_FILE):
        return None, None, f"Error: Workflow file {COMFY_WORKFLOW_FILE} not found."
    
    try:
        with open(COMFY_WORKFLOW_FILE, 'r') as f:
            workflow = json.load(f)
        
        workflow["6"]["inputs"]["text"] = prompt
        
        res_map = {
            "1:1": (1024, 1024),
            "16:9": (1344, 768),
            "9:16": (768, 1344),
            "4:3": (1152, 864),
            "3:4": (864, 1152)
        }
        width, height = res_map.get(aspect_ratio, (1024, 1024))
        workflow["13"]["inputs"]["width"] = width
        workflow["13"]["inputs"]["height"] = height
        workflow["38"]["inputs"]["seed"] = random.randint(1, 1125899906842624)
        
        client_id = str(uuid.uuid4())
        payload = {"prompt": workflow, "client_id": client_id}
        
        response = requests.post(f"{COMFY_URL}/prompt", json=payload)
        response.raise_for_status()
        prompt_id = response.json().get("prompt_id")
        
        max_retries = 60
        for _ in range(max_retries):
            hist_resp = requests.get(f"{COMFY_URL}/history/{prompt_id}")
            if hist_resp.status_code == 200:
                history = hist_resp.json()
                if prompt_id in history:
                    outputs = history[prompt_id].get("outputs", {})
                    for node_id in outputs:
                        if "images" in outputs[node_id]:
                            image_data = outputs[node_id]["images"][0]
                            img_url = f"{COMFY_URL}/view?filename={image_data['filename']}&subfolder={image_data['subfolder']}&type={image_data['type']}"
                            img_resp = requests.get(img_url)
                            img_resp.raise_for_status()
                            
                            img = Image.open(io.BytesIO(img_resp.content))
                            
                            # Embed metadata
                            metadata = PngInfo()
                            metadata.add_text("Comment", prompt)
                            metadata.add_text("CharacterName", character_name)
                            
                            safe_name = "".join([c if c.isalnum() else "_" for c in character_name]).strip("_")
                            filename = f"{safe_name}_portrait_comfy.png" if safe_name else "rpg_portrait_comfy.png"
                            
                            temp_dir = tempfile.mkdtemp()
                            img_path = os.path.join(temp_dir, filename)
                            img.save(img_path, "PNG", pnginfo=metadata)
                            return img, img_path, f"Image generated via ComfyUI!"
            time.sleep(1)
            
        return None, None, "ComfyUI generation timed out."
        
    except Exception as e:
        traceback.print_exc()
        return None, None, f"ComfyUI Error: {e}"

def generate_image_with_hf(prompt, aspect_ratio, model_id=None, provider=None, token=None, character_name="Unnamed Hero"):
    """Generates an image using Hugging Face Inference API."""
    active_token = token if token else HF_TOKEN
    if not active_token:
        return None, None, "Error: Hugging Face token not found. Please log in or provide a token."
    
    active_model = model_id if model_id else HF_IMAGE_MODEL
    active_provider = provider if provider and provider.strip() else "auto"
    
    # Resolution mapping
    res_map = {
        "1:1": (1024, 1024),
        "16:9": (1344, 768),
        "9:16": (768, 1344),
        "4:3": (1152, 864),
        "3:4": (864, 1152)
    }
    width, height = res_map.get(aspect_ratio, (1024, 1024))
    
    try:
        client = InferenceClient(api_key=active_token, provider=active_provider)
        img = client.text_to_image(prompt, model=active_model, width=width, height=height)
        
        # Embed metadata
        metadata = PngInfo()
        metadata.add_text("Comment", prompt)
        metadata.add_text("CharacterName", character_name)
        
        safe_name = "".join([c if c.isalnum() else "_" for c in character_name]).strip("_")
        filename = f"{safe_name}_portrait_hf.png" if safe_name else "rpg_portrait_hf.png"
        
        temp_dir = tempfile.mkdtemp()
        img_path = os.path.join(temp_dir, filename)
        img.save(img_path, "PNG", pnginfo=metadata)
        return img, img_path, f"Image generated via Hugging Face ({active_model})!"
    except Exception as e:
        traceback.print_exc()
        return None, None, f"Hugging Face Image Error: {e}"

def generate_image_master(refined_prompt, technical_prompt, aspect_ratio, backend, hf_image_model, hf_image_provider, manual_token=None, character_name="Unnamed Hero"):
    """Routes image generation to the selected backend."""
    final_prompt = refined_prompt.strip() if refined_prompt.strip() else technical_prompt
    
    # Prioritizes manual token
    hf_token = manual_token.strip() if manual_token and manual_token.strip() else None
    
    if backend == "ComfyUI (Local)":
        return generate_image_with_comfy(final_prompt, aspect_ratio, character_name)
    elif backend == "Hugging Face (Cloud)":
        return generate_image_with_hf(final_prompt, aspect_ratio, hf_image_model, hf_image_provider, hf_token, character_name)
    else:
        return generate_image_with_gemini(refined_prompt, technical_prompt, aspect_ratio, character_name)