"""
Strike Capital AI Diligence Automation - Gradio Application
V0 Document Generation from Harmonic PDFs.
"""
import os
import re
import tempfile
import gradio as gr
import markdown2
from fpdf import FPDF

from config import validate_config
from pdf_extractor import extract_from_pdf
from pinecone_store import store_extracted_data, store_v0_document, store_sentence_chunks
from v0_generator import generate_v0_document

# Validate configuration on startup
try:
    validate_config()
    print("[OK] Configuration validated successfully")
except ValueError as e:
    print(f"[ERROR] Configuration error: {e}")

# Custom CSS for Strike Capital branding
STRIKE_CSS = """
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    line-height: 1.6;
    color: #1a1a1a;
    max-width: 900px;
    margin: 0 auto;
    padding: 40px;
    background: #ffffff;
}

h1 {
    color: #0a0a0a;
    font-weight: 700;
    font-size: 28px;
    border-bottom: 3px solid #2563eb;
    padding-bottom: 12px;
    margin-bottom: 24px;
}

h2 {
    color: #0a0a0a;
    font-weight: 600;
    font-size: 20px;
    margin-top: 32px;
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 1px solid #e5e5e5;
}

h3 {
    color: #262626;
    font-weight: 600;
    font-size: 16px;
    margin-top: 24px;
}

p {
    margin-bottom: 16px;
}

ul, ol {
    margin-bottom: 16px;
    padding-left: 24px;
}

li {
    margin-bottom: 8px;
}

/* Table wrapper for horizontal scroll */
.table-wrapper {
    overflow-x: auto;
    margin: 16px 0;
}

table {
    width: 100%;
    min-width: 600px;
    border-collapse: collapse;
    font-size: 13px;
    display: block;
    overflow-x: auto;
}

th {
    background: #f5f5f5;
    font-weight: 600;
    text-align: left;
    padding: 10px 8px;
    border: 1px solid #e5e5e5;
    white-space: nowrap;
}

td {
    padding: 8px;
    border: 1px solid #e5e5e5;
    min-width: 80px;
}

tr:nth-child(even) {
    background: #fafafa;
}

strong {
    font-weight: 600;
}

em {
    color: #525252;
}

hr {
    border: none;
    border-top: 1px solid #e5e5e5;
    margin: 24px 0;
}

code {
    background: #f5f5f5;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 14px;
}

blockquote {
    border-left: 4px solid #2563eb;
    padding-left: 16px;
    margin: 16px 0;
    color: #525252;
}

.header-meta {
    color: #737373;
    font-size: 14px;
    margin-bottom: 24px;
}

@media print {
    body {
        padding: 20px;
    }
    h2 {
        page-break-after: avoid;
    }
}
"""


def process_pdf(pdf_file, progress=gr.Progress()):
    """
    Main processing pipeline: PDF → Extract → Generate V0 → Store.
    
    Args:
        pdf_file: Uploaded PDF file
        progress: Gradio progress tracker
    
    Returns:
        Tuple of (markdown_content, html_preview, status_message)
    """
    if pdf_file is None:
        return "", "<p>Please upload a Harmonic PDF report.</p>", "⚠️ No file uploaded"
    
    try:
        # Step 1: Extract data from PDF (returns extracted_data AND sentence_chunks)
        progress(0.1, desc="📄 Extracting text and chunking sentences...")
        
        def extraction_progress(batch, total):
            progress(0.1 + (0.3 * batch / total), desc=f"🔍 Processing batch {batch}/{total}...")
        
        extracted_data, sentence_chunks = extract_from_pdf(pdf_file.name, progress_callback=extraction_progress)
        
        # Get company name
        company_name = extracted_data.get("company_info", {}).get("name", "Unknown Company")
        progress(0.4, desc=f"✓ Extracted data for {company_name}")
        
        # Step 2: Store sentence chunks in Pinecone (one vector per sentence)
        progress(0.45, desc=f"💾 Storing {len(sentence_chunks)} sentence chunks in Pinecone...")
        chunks_result = store_sentence_chunks(company_name, sentence_chunks)
        
        # Step 3: Store extracted sections in Pinecone
        progress(0.55, desc="💾 Storing extracted sections...")
        store_result = store_extracted_data(company_name, extracted_data)
        
        # Step 4: Generate V0 document
        def generation_progress(step, total, section_name):
            progress(0.6 + (0.35 * step / total), desc=f"✍️ Generating: {section_name}...")
        
        v0_document = generate_v0_document(
            extracted_data, 
            company_name,
            progress_callback=generation_progress
        )
        
        # Step 5: Store V0 document
        progress(0.95, desc="💾 Saving V0 document...")
        store_v0_document(company_name, v0_document)
        
        # Convert to HTML for preview
        html_content = markdown2.markdown(
            v0_document, 
            extras=["tables", "fenced-code-blocks", "header-ids"]
        )
        html_preview = f"<style>{STRIKE_CSS}</style>{html_content}"
        
        progress(1.0, desc="✓ Complete!")
        
        status = f"✅ Successfully generated V0 for **{company_name}**\n\n"
        status += f"- Sentence chunks stored: {chunks_result.get('chunks_stored', 'N/A')}\n"
        status += f"- Sections stored: {store_result.get('sections_stored', 'N/A')}\n"
        status += f"- Document version: v0"
        
        return v0_document, html_preview, status
        
    except Exception as e:
        error_msg = f"❌ Error: {str(e)}"
        return "", f"<p style='color: red;'>{error_msg}</p>", error_msg


def export_to_html(markdown_content, auto_print=False):
    """Export markdown to styled HTML file with optional auto-print dialog."""
    if not markdown_content:
        return None
    
    html_content = markdown2.markdown(
        markdown_content,
        extras=["tables", "fenced-code-blocks", "header-ids"]
    )
    
    # Auto-print script (opens print dialog when page loads)
    print_script = """
    <script>
        window.onload = function() {
            // Small delay to ensure styles are loaded
            setTimeout(function() {
                window.print();
            }, 500);
        }
    </script>
    """ if auto_print else ""
    
    full_html = f"""<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Strike Capital - V0 Diligence Document</title>
    <style>{STRIKE_CSS}</style>
    {print_script}
</head>
<body>
{html_content}
</body>
</html>"""
    
    # Save to temp file
    with tempfile.NamedTemporaryFile(mode='w', suffix='.html', delete=False, encoding='utf-8') as f:
        f.write(full_html)
        return f.name


def export_to_pdf(markdown_content):
    """Export markdown to a real PDF file using fpdf2."""
    if not markdown_content:
        return None
    
    # Create PDF with Unicode support
    pdf = FPDF()
    pdf.set_auto_page_break(auto=True, margin=15)
    pdf.add_page()
    
    # Use built-in fonts (Helvetica for body, Courier for code)
    # Note: For full Unicode support, you'd need to add a Unicode font
    
    # Process markdown content line by line
    lines = markdown_content.split('\n')
    
    for line in lines:
        line = line.strip()
        
        if not line:
            pdf.ln(4)
            continue
        
        # Handle headers
        if line.startswith('# '):
            pdf.set_font('Helvetica', 'B', 20)
            pdf.set_text_color(10, 10, 10)
            text = line[2:].strip()
            pdf.multi_cell(0, 10, clean_text_for_pdf(text))
            pdf.ln(2)
            # Add underline
            pdf.set_draw_color(37, 99, 235)
            pdf.set_line_width(0.8)
            pdf.line(10, pdf.get_y(), 200, pdf.get_y())
            pdf.ln(6)
            
        elif line.startswith('## '):
            pdf.set_font('Helvetica', 'B', 16)
            pdf.set_text_color(10, 10, 10)
            text = line[3:].strip()
            pdf.ln(6)
            pdf.multi_cell(0, 8, clean_text_for_pdf(text))
            pdf.ln(2)
            
        elif line.startswith('### '):
            pdf.set_font('Helvetica', 'B', 13)
            pdf.set_text_color(38, 38, 38)
            text = line[4:].strip()
            pdf.ln(4)
            pdf.multi_cell(0, 7, clean_text_for_pdf(text))
            pdf.ln(2)
            
        elif line.startswith('- ') or line.startswith('* '):
            pdf.set_font('Helvetica', '', 11)
            pdf.set_text_color(26, 26, 26)
            text = line[2:].strip()
            # Bullet point
            pdf.cell(8, 6, chr(149))  # bullet character
            pdf.multi_cell(0, 6, clean_text_for_pdf(text))
            
        elif re.match(r'^\d+\.\s', line):
            pdf.set_font('Helvetica', '', 11)
            pdf.set_text_color(26, 26, 26)
            pdf.multi_cell(0, 6, clean_text_for_pdf(line))
            
        elif line.startswith('**') and line.endswith('**'):
            pdf.set_font('Helvetica', 'B', 11)
            pdf.set_text_color(26, 26, 26)
            text = line.strip('*')
            pdf.multi_cell(0, 6, clean_text_for_pdf(text))
            
        elif line.startswith('---') or line.startswith('***'):
            pdf.ln(4)
            pdf.set_draw_color(229, 229, 229)
            pdf.set_line_width(0.3)
            pdf.line(10, pdf.get_y(), 200, pdf.get_y())
            pdf.ln(4)
            
        else:
            # Regular paragraph
            pdf.set_font('Helvetica', '', 11)
            pdf.set_text_color(26, 26, 26)
            # Handle inline bold (**text**)
            text = clean_text_for_pdf(line)
            pdf.multi_cell(0, 6, text)
    
    # Save to temp file
    with tempfile.NamedTemporaryFile(mode='wb', suffix='.pdf', delete=False) as f:
        pdf.output(f.name)
        return f.name


def clean_text_for_pdf(text):
    """Clean text for PDF output - remove markdown formatting and handle special chars."""
    # Remove bold markers
    text = re.sub(r'\*\*(.+?)\*\*', r'\1', text)
    # Remove italic markers
    text = re.sub(r'\*(.+?)\*', r'\1', text)
    # Remove inline code markers
    text = re.sub(r'`(.+?)`', r'\1', text)
    # Replace special Unicode chars that might cause issues
    text = text.replace('→', '->')
    text = text.replace('⚠', '[!]')
    text = text.replace('✓', '[OK]')
    text = text.replace('✅', '[OK]')
    text = text.replace('❌', '[X]')
    text = text.replace('📄', '')
    text = text.replace('📊', '')
    text = text.replace('📋', '')
    text = text.replace('💾', '')
    text = text.replace('🔍', '')
    text = text.replace('✍️', '')
    text = text.replace('🚀', '')
    text = text.replace('📤', '')
    text = text.replace('📥', '')
    text = text.replace('🎯', '')
    # Encode to latin-1 (what FPDF uses by default), replacing unknown chars
    text = text.encode('latin-1', errors='replace').decode('latin-1')
    return text


# Build Gradio Interface
with gr.Blocks(
    title="Strike Capital - AI Diligence",
    theme=gr.themes.Soft(
        primary_hue="blue",
        neutral_hue="slate",
    ),
    css="""
    .container { max-width: 1400px; margin: auto; }
    .header { text-align: center; margin-bottom: 2rem; }
    .status-box { padding: 1rem; border-radius: 8px; background: #f8fafc; }
    /* Make tables horizontally scrollable */
    table { display: block; overflow-x: auto; white-space: nowrap; max-width: 100%; }
    """
) as app:
    
    gr.Markdown("""
    # 🎯 Strike Capital - AI Diligence Automation
    
    Upload a Harmonic PDF report to automatically generate a V0 Diligence Document.
    """)
    
    with gr.Row():
        with gr.Column(scale=1, min_width=280):
            gr.Markdown("### 📤 Upload Harmonic Report")
            pdf_input = gr.File(
                label="Harmonic PDF Report",
                file_types=[".pdf"],
                type="filepath"
            )
            
            generate_btn = gr.Button(
                "🚀 Generate V0 Document",
                variant="primary",
                size="lg"
            )
            
            gr.Markdown("### 📊 Status")
            status_output = gr.Markdown("*Ready to process...*")
            
            gr.Markdown("### 📥 Export")
            with gr.Row():
                export_html_btn = gr.Button("📄 HTML", size="sm", variant="secondary")
                export_pdf_btn = gr.Button("📑 Save as PDF", size="sm", variant="primary")
            html_download = gr.File(label="HTML Download", visible=False)
            pdf_download = gr.File(label="PDF Download", visible=False)
        
        with gr.Column(scale=4):
            gr.Markdown("### 📋 Document Preview")
            
            with gr.Tabs():
                with gr.TabItem("Preview"):
                    html_preview = gr.HTML(
                        value="<p style='color: #666; text-align: center; padding: 40px;'>Upload a PDF to generate your V0 document...</p>"
                    )
                
                with gr.TabItem("Markdown"):
                    markdown_output = gr.Textbox(
                        label="Raw Markdown",
                        lines=30,
                        max_lines=50,
                        show_copy_button=True
                    )
    
    # Event handlers
    generate_btn.click(
        fn=process_pdf,
        inputs=[pdf_input],
        outputs=[markdown_output, html_preview, status_output],
        show_progress=True
    )
    
    export_html_btn.click(
        fn=export_to_html,
        inputs=[markdown_output],
        outputs=[html_download]
    ).then(
        fn=lambda x: gr.update(visible=True) if x else gr.update(visible=False),
        inputs=[html_download],
        outputs=[html_download]
    )
    
    export_pdf_btn.click(
        fn=export_to_pdf,
        inputs=[markdown_output],
        outputs=[pdf_download]
    ).then(
        fn=lambda x: gr.update(visible=True) if x else gr.update(visible=False),
        inputs=[pdf_download],
        outputs=[pdf_download]
    )
    
    gr.Markdown("""
    ---
    *Strike Capital AI Diligence System v0.1 | Powered by GPT-5.1 + Pinecone*
    """)


# For Hugging Face Spaces Docker deployment
app.launch(
    server_name="0.0.0.0",
    server_port=7860
)