#!/usr/bin/env python3
"""
Simple training script for Elizabeth - focuses on core identity without complex formatting
"""

import os
os.environ['HF_HOME'] = '/home/x/.cache/huggingface'

import torch
from transformers import (
    AutoModelForCausalLM, 
    AutoTokenizer, 
    TrainingArguments, 
    Trainer,
    DataCollatorForLanguageModeling
)
from datasets import Dataset
import json

# Configuration
MODEL_NAME = "Qwen/Qwen3-8B"
TRAIN_DATA_PATH = "/home/x/adaptai/aiml/e-train-1/elizabeth_tooluse_minipack_v1.jsonl"
OUTPUT_DIR = "/home/x/adaptai/experiments/qwen3-8b-elizabeth-simple"

# YaRN Configuration
YARN_CONFIG = {
    "rope_scaling": {
        "type": "yarn",
        "factor": 8.0,
        "original_max_position_embeddings": 16384,
        "extrapolation_factor": 1.0,
        "attn_factor": 1.0,
        "beta_fast": 32.0,
        "beta_slow": 1.0
    }
}

class SimpleTrainer:
    def __init__(self):
        self.model = None
        self.tokenizer = None
        
    def setup_model(self):
        """Load model with YaRN configuration"""
        print("🚀 Loading Qwen3-8B with YaRN configuration...")
        
        # Load tokenizer
        self.tokenizer = AutoTokenizer.from_pretrained(
            MODEL_NAME,
            trust_remote_code=True
        )
        
        if self.tokenizer.pad_token is None:
            self.tokenizer.pad_token = self.tokenizer.eos_token
        
        # Load model with YaRN
        self.model = AutoModelForCausalLM.from_pretrained(
            MODEL_NAME,
            torch_dtype=torch.bfloat16,
            device_map="auto",
            trust_remote_code=True,
            **YARN_CONFIG
        )
        
        print(f"✅ Model loaded with YaRN configuration")
        print(f"📏 Context length: {self.model.config.max_position_embeddings}")
        
    def load_simple_dataset(self):
        """Load only the simple text examples"""
        print("📊 Loading simple training data...")
        
        texts = []
        
        # Load only examples with simple text (no tool calls)
        with open(TRAIN_DATA_PATH, 'r') as f:
            for line in f:
                data = json.loads(line)
                
                # Skip complex tool call examples for now
                has_tool_call = any('tool_call' in str(msg) for msg in data.get('messages', []))
                if not has_tool_call:
                    # Convert to simple text
                    conversation = ""
                    for msg in data.get('messages', []):
                        if 'content' in msg:
                            conversation += f"{msg['role']}: {msg['content']}\n"
                    texts.append(conversation)
        
        print(f"✅ Loaded {len(texts)} simple examples")
        
        # Create dataset
        dataset = Dataset.from_dict({"text": texts})
        return dataset
    
    def train(self):
        """Start simple training"""
        self.setup_model()
        dataset = self.load_simple_dataset()
        
        # Simple training arguments
        training_args = TrainingArguments(
            output_dir=OUTPUT_DIR,
            num_train_epochs=1,
            per_device_train_batch_size=1,
            gradient_accumulation_steps=16,
            learning_rate=2e-5,
            warmup_ratio=0.03,
            lr_scheduler_type="cosine",
            logging_steps=10,
            save_steps=100,
            bf16=True,
            gradient_checkpointing=True,
            report_to=[],
        )
        
        # Data collator
        data_collator = DataCollatorForLanguageModeling(
            tokenizer=self.tokenizer,
            mlm=False,
        )
        
        # Trainer
        trainer = Trainer(
            model=self.model,
            args=training_args,
            train_dataset=dataset,
            data_collator=data_collator,
            tokenizer=self.tokenizer,
        )
        
        print("🎯 Starting simple training...")
        
        # Start training
        trainer.train()
        
        # Save final model
        trainer.save_model()
        
        print(f"✅ Simple training completed!")

if __name__ == "__main__":
    trainer = SimpleTrainer()
    trainer.train()