import gradio as gr
import pandas as pd
from huggingface_hub import snapshot_download, create_repo
from huggingface_hub.utils import RepositoryNotFoundError
import os

from src.about import (
    INTRODUCTION_TEXT,
    LLM_BENCHMARKS_TEXT,
    TITLE,
)
from src.display.css_html_js import custom_css
from src.display.utils import (
    BENCHMARK_COLS,
    COLS,
    AutoEvalColumn,
    fields,
)
from src.envs import API, EVAL_RESULTS_PATH, RESULTS_REPO, TOKEN, OWNER
from src.populate import get_leaderboard_df
from src.evaluation.dynamic_eval import run_dynamic_perplexity_eval

def create_results_dataframe():
    """Create and return the results DataFrame for display"""
    import sys
    
    sys.stderr.write("\n📊 CREATE_RESULTS_DATAFRAME CALLED\n")
    sys.stderr.flush()
    
    df = get_leaderboard_df(EVAL_RESULTS_PATH, COLS, BENCHMARK_COLS)
    
    sys.stderr.write(f"📋 Retrieved leaderboard df: {df.shape if df is not None else 'None'}\n")
    sys.stderr.flush()
    
    if df is None or df.empty:
        sys.stderr.write("⚠️ DataFrame is None or empty, returning empty DataFrame\n")
        sys.stderr.flush()
        # Return empty DataFrame with proper columns
        return pd.DataFrame(columns=["Model", "Perplexity", "Match P-Value", "Average Score", "Type", "Precision"])
    
    sys.stderr.write(f"📊 Original DataFrame columns: {list(df.columns)}\n")
    sys.stderr.flush()
    
    # Check if required columns exist
    required_cols = [
        AutoEvalColumn.model.name,
        "Perplexity",
        AutoEvalColumn.model_trace_p_value.name,
        AutoEvalColumn.average.name,
        AutoEvalColumn.model_type.name,
        AutoEvalColumn.precision.name,
    ]
    
    missing_cols = [col for col in required_cols if col not in df.columns]
    if missing_cols:
        sys.stderr.write(f"⚠️ Missing columns in DataFrame: {missing_cols}\n")
        sys.stderr.flush()
        # Add missing columns with default values
        for col in missing_cols:
            if col == AutoEvalColumn.model_trace_p_value.name:
                df[col] = None
                sys.stderr.write(f"➕ Added {col} column with None values\n")
    
    # Select and rename columns for display
    try:
        display_df = df[required_cols].copy()
        sys.stderr.write(f"✅ Selected columns successfully: {list(display_df.columns)}\n")
    except Exception as e:
        sys.stderr.write(f"💥 Error selecting columns: {e}\n")
        sys.stderr.flush()
        return pd.DataFrame(columns=["Model", "Perplexity", "Match P-Value", "Average Score", "Type", "Precision"])
    
    # Rename columns for better display
    display_df.columns = ["Model", "Perplexity", "Match P-Value", "Average Score", "Type", "Precision"]
    
    sys.stderr.write(f"🎯 Final display DataFrame shape: {display_df.shape}\n")
    sys.stderr.write(f"🎯 Final columns: {list(display_df.columns)}\n")
    
    # Check p-value column
    if "Match P-Value" in display_df.columns:
        p_value_stats = display_df["Match P-Value"].describe()
        sys.stderr.write(f"📈 P-Value column stats:\n{p_value_stats}\n")
    
    sys.stderr.flush()
    return display_df

def run_perplexity_test(model_name, revision, precision):
    """Run perplexity evaluation on demand."""
    import sys
    import traceback
    import gradio as gr
    
    if not model_name:
        return "Please enter a model name.", gr.update(), gr.update()
    
    try:
        # Use stderr for more reliable logging in HF Spaces
        sys.stderr.write(f"\n=== RUNNING PERPLEXITY TEST ===\n")
        sys.stderr.write(f"Model: {model_name}\n")
        sys.stderr.write(f"Revision: {revision}\n")
        sys.stderr.write(f"Precision: {precision}\n")
        sys.stderr.flush()
        
        success, result = run_dynamic_perplexity_eval(model_name, revision, precision)
        sys.stderr.write(f"Evaluation result - Success: {success}, Result: {result}\n")
        sys.stderr.flush()
        
        if success:
            sys.stderr.write("Evaluation succeeded - updating both results tables\n")
            sys.stderr.flush()
            
            # Get updated results (this will trigger model trace p-value computation for the new model)
            sys.stderr.write("🔄 Creating updated results DataFrame (may compute model trace p-values)...\n")
            sys.stderr.flush()
            
            updated_df = create_results_dataframe()
            
            sys.stderr.write("✅ Updated DataFrame created successfully\n")
            sys.stderr.flush()
            
            success_msg = f"""✅ **Perplexity evaluation completed successfully!**

**Model**: {model_name}
**Perplexity Score**: {result:.4f}

🎉 **Results have been saved and both tables have been updated!**

Note: Model trace p-value computation may take additional time and will appear in the logs."""
            
            return success_msg, gr.update(value=updated_df), gr.update(value=updated_df)
        else:
            return f"❌ **Evaluation failed**: {result}", gr.update(), gr.update()
            
    except Exception as e:
        error_msg = str(e)
        traceback_str = traceback.format_exc()
        sys.stderr.write(f"Critical error in run_perplexity_test: {error_msg}\n")
        sys.stderr.write(f"Traceback: {traceback_str}\n")
        sys.stderr.flush()
        return f"❌ **Critical error**: {error_msg}", gr.update(), gr.update()

# Initialize results repository and directory
try:
    # Try to download existing repository
    try:
        snapshot_download(
            repo_id=RESULTS_REPO,
            local_dir=EVAL_RESULTS_PATH,
            repo_type="dataset",
            tqdm_class=None,
            etag_timeout=30,
            token=TOKEN
        )
    except RepositoryNotFoundError:
        # Create the repository if it doesn't exist
        print(f"Creating new results repository: {RESULTS_REPO}")
        create_repo(
            repo_id=RESULTS_REPO,
            repo_type="dataset",
            private=False,
            token=TOKEN
        )
        # Create local directory
        os.makedirs(EVAL_RESULTS_PATH, exist_ok=True)
except Exception as e:
    print(f"Error initializing results: {e}")
    # Ensure local directory exists even if repo operations fail
    os.makedirs(EVAL_RESULTS_PATH, exist_ok=True)

# Get initial results data
import sys
sys.stderr.write("\n🚀 STARTING GRADIO APP INITIALIZATION\n")
sys.stderr.write("📊 Creating initial results DataFrame...\n")
sys.stderr.flush()

RESULTS_DF = create_results_dataframe()

sys.stderr.write(f"✅ Initial DataFrame created with shape: {RESULTS_DF.shape}\n")
sys.stderr.write(f"📋 Columns: {list(RESULTS_DF.columns)}\n")
sys.stderr.flush()

# Create the Gradio interface
sys.stderr.write("🎨 Creating Gradio interface...\n")
sys.stderr.flush()

demo = gr.Blocks(css=custom_css)
with demo:
    gr.HTML(TITLE)
    gr.Markdown(INTRODUCTION_TEXT, elem_classes="markdown-text")

    with gr.Tabs(elem_classes="tab-buttons") as tabs:
        with gr.TabItem("🏅 Results", elem_id="results-tab", id=0):
            gr.Markdown("## Model Evaluation Results")
            results_table = gr.DataFrame(
                value=RESULTS_DF,
                headers=["Model", "Perplexity", "Match P-Value", "Average Score", "Type", "Precision"],
                interactive=False,
                wrap=False
            )

        with gr.TabItem("📝 About", elem_id="about-tab", id=1):
            gr.Markdown(LLM_BENCHMARKS_TEXT, elem_classes="markdown-text")

        with gr.TabItem("🧪 Test Model", elem_id="test-model-tab", id=2):
            gr.Markdown("## Run Perplexity Test\n\nTest any Hugging Face model for perplexity evaluation.")
            
            with gr.Row():
                with gr.Column():
                    model_name = gr.Textbox(label="Model name", placeholder="openai-community/gpt2")
                    revision = gr.Textbox(label="Revision", placeholder="main", value="main")
                    precision = gr.Dropdown(
                        choices=["float16", "bfloat16"],
                        label="Precision",
                        value="float16"
                    )
                    debug_mode = gr.Checkbox(label="Enable debug mode (more verbose logging)", value=True)
                
                with gr.Column():
                    test_button = gr.Button("🚀 Run Perplexity Test", variant="primary")
                    result = gr.Markdown()
            
            gr.Markdown("## Live Results")
            live_results_table = gr.DataFrame(
                value=RESULTS_DF,
                headers=["Model", "Perplexity", "Match P-Value", "Average Score", "Type", "Precision"],
                interactive=False,
                wrap=False
            )
            
            gr.Markdown("""
            ### Tips:
            - **Check stderr logs** in HF Spaces for detailed debugging information
            - **Results will update automatically** in the table above after evaluation completes
            - **Example models to test**: `openai-community/gpt2`, `EleutherAI/gpt-neo-1.3B`, `openai-community/gpt2-large`
            - **Lower perplexity scores = better performance** (better at predicting text)
            
            ### How it works:
            1. Enter a model name from Hugging Face Hub
            2. Click "Run Perplexity Test" 
            3. Wait for evaluation to complete (may take a few minutes for large models)
            4. Results will appear automatically in the table above!
            """)
            
            test_button.click(
                run_perplexity_test,
                [model_name, revision, precision],
                [result, live_results_table, results_table]
            )

sys.stderr.write("🎯 GRADIO INTERFACE SETUP COMPLETE\n")
sys.stderr.write("🚀 LAUNCHING GRADIO APP WITH MODEL TRACING INTEGRATION\n")
sys.stderr.write("📊 Features enabled:\n")
sys.stderr.write("   - Perplexity evaluation\n")
sys.stderr.write("   - Model trace p-value computation (vs GPT-2 base)\n")
sys.stderr.write("   - Match statistic with alignment\n")
sys.stderr.write("🎉 Ready to accept requests!\n")
sys.stderr.flush()

demo.queue(default_concurrency_limit=5).launch()