import json
import base64
import io
import requests
from pathlib import Path
from typing import Dict, Any, Optional, Tuple

import gradio as gr
from PIL import Image

# Import prompt building functions from prompts.py
from prompts import make_user_query, system_prompt, prompts_b

# ==================== CONFIGURATION ====================

# API settings
API_URL = "http://127.0.0.1:8000/v1/chat/completions"
API_KEY = "not-needed"

# Image settings
MAX_PIXELS = 1.0  # Maximum resolution in megapixels (e.g., 4.0 = 4MP)

# Request settings
MAX_TOKENS = 4096
TEMPERATURE = 0.5
REQUEST_TIMEOUT = 5  # Reduced for connection check
WORK_TIMEOUT = 300

# Captioning type options (from prompts_b in prompts.py)
CAPTION_TYPES = list(prompts_b.keys())
DEFAULT_C_TYPE = CAPTION_TYPES[0] if CAPTION_TYPES else None

if not DEFAULT_C_TYPE:
    raise RuntimeError("No caption types available in prompts_b!")

# ==================== END CONFIGURATION ====================


def check_api_connection(api_url: str) -> Tuple[str, str]:
    """
    Check API connection and return model info.
    Returns (status_message, model_name).
    """
    try:
        # Try to get models endpoint
        base_url = api_url.rstrip('/').split('/v1/')[0]
        models_url = f"{base_url}/v1/models"
        
        response = requests.get(models_url, timeout=REQUEST_TIMEOUT)
        response.raise_for_status()
        
        result = response.json()
        if result and 'data' in result and len(result['data']) > 0:
            model_name = result['data'][0].get('id', 'Unknown')
            return "✅ Connected", model_name
        else:
            return "⚠️ Connected (no model info)", "Unknown"
            
    except requests.exceptions.ConnectionError:
        return "❌ Connection failed", "N/A"
    except requests.exceptions.Timeout:
        return "❌ Timeout", "N/A"
    except Exception as e:
        return f"❌ Error: {str(e)[:50]}", "N/A"


def encode_image_base64(image: Image.Image, max_pixels: float = MAX_PIXELS) -> str:
    """Encode image to base64 string, resizing if necessary."""
    img = image
    
    if img.mode != 'RGB':
        img = img.convert('RGB')
    
    # Check if resizing needed
    current_pixels = img.width * img.height
    max_pixels_count = max_pixels * 1_000_000
    
    if current_pixels >= max_pixels_count:
        # Calculate new dimensions while preserving aspect ratio
        scale = (max_pixels_count / current_pixels) ** 0.5
        new_width = int(img.width * scale)
        new_height = int(img.height * scale)
        
        # Resize with high quality
        img = img.resize((new_width, new_height), Image.Resampling.LANCZOS)
        # No resize needed
    
    # Encode resized image to base64
    buffer = io.BytesIO()
    img.save(buffer, format='JPEG', quality=100)
    return base64.b64encode(buffer.getvalue()).decode("utf-8")


def call_caption_api(messages: list, api_url: str = API_URL, model_name: str = "toriigate-0.5") -> Optional[str]:
    """Call the captioning API."""
    payload = {
        "model": model_name,
        "messages": messages,
        "max_tokens": MAX_TOKENS,
        "temperature": TEMPERATURE,
        "stream": False,
        "stop": ["<|im_end|>", "<|endoftext|>"]
    }

    headers = {
        "Content-Type": "application/json",
        "Authorization": f"Bearer {API_KEY}"
    }

    try:
        response = requests.post(
            api_url,
            headers=headers,
            json=payload,
            timeout=WORK_TIMEOUT
        )
        response.raise_for_status()

        result = response.json()
        content = result['choices'][0]['message']['content']
        return content

    except requests.exceptions.RequestException as e:
        return f"API Error: {e}"
    except (KeyError, IndexError) as e:
        return f"Parse Error: {e}"


def empty_template() -> Dict[str, Any]:
    """Return empty template for missing JSON data."""
    return {
        "tags": [],
        "characters": [],
        "char_p_tags": {"chars": {}, "skins": {}},
        "char_descr": {"chars": {}, "skins": {}}
    }


def generate_caption(
    image: Image.Image,
    api_url: str,
    model_name: str,
    c_type: str,
    use_names: bool,
    add_tags: bool,
    add_char_list: bool,
    add_chars_tags: bool,
    add_chars_descr: bool,
    tags_text: str,
    characters_text: str,
    char1_name: str,
    char1_tags: str,
    char2_name: str,
    char2_tags: str,
    char3_name: str,
    char3_tags: str,
    char4_name: str,
    char4_tags: str,
    char5_name: str,
    char5_tags: str,
    char_descr1_name: str,
    char_descr1_text: str,
    char_descr2_name: str,
    char_descr2_text: str,
    char_descr3_name: str,
    char_descr3_text: str,
    char_descr4_name: str,
    char_descr4_text: str,
    char_descr5_name: str,
    char_descr5_text: str
) -> str:
    """Generate caption for a single image."""
    if image is None:
        return "Please upload an image first."

    # Build item dict from inputs
    item = empty_template()

    # Parse tags
    if add_tags and tags_text.strip():
        item["tags"] = [t.strip() for t in tags_text.split(',') if t.strip()]

    # Parse characters
    if add_char_list:
        item["characters"] = [c.strip() for c in characters_text.split(',') if c.strip()]
    
    # Auto-populate characters list from char tags/descriptions if not manually specified
    if add_chars_tags or add_chars_descr:
        auto_chars = []
        
        if add_chars_tags:
            char_entries = [
                char1_name, char2_name, char3_name, char4_name, char5_name
            ]
            for name in char_entries:
                if name and name.strip():
                    auto_chars.append(name.strip())
        
        if add_chars_descr:
            descr_entries = [
                char_descr1_name, char_descr2_name, char_descr3_name,
                char_descr4_name, char_descr5_name
            ]
            for name in descr_entries:
                if name and name.strip() and name.strip() not in auto_chars:
                    auto_chars.append(name.strip())
        
        # Only auto-populate if characters list is empty or not manually set
        if auto_chars and (not add_char_list or not item["characters"]):
            item["characters"] = auto_chars
            add_char_list = True

    # Parse character tags from structured inputs
    if add_chars_tags:
        chars_dict = {}
        char_entries = [
            (char1_name, char1_tags),
            (char2_name, char2_tags),
            (char3_name, char3_tags),
            (char4_name, char4_tags),
            (char5_name, char5_tags)
        ]
        for name, tags_str in char_entries:
            if name is None:
                continue
            name = name.strip()
            if name:
                tags_list = [t.strip() for t in tags_str.split(',') if t.strip()] if tags_str and tags_str.strip() else []
                chars_dict[name] = tags_list
        
        if chars_dict:
            item["char_p_tags"] = {"chars": chars_dict, "skins": {}}

    # Parse character descriptions from structured inputs
    if add_chars_descr:
        descr_dict = {}
        descr_entries = [
            (char_descr1_name, char_descr1_text),
            (char_descr2_name, char_descr2_text),
            (char_descr3_name, char_descr3_text),
            (char_descr4_name, char_descr4_text),
            (char_descr5_name, char_descr5_text)
        ]
        for name, descr in descr_entries:
            if name is None or descr is None:
                continue
            name = name.strip()
            descr = descr.strip()
            if name and descr:
                descr_dict[name] = descr
        
        if descr_dict:
            item["char_descr"] = {"chars": descr_dict, "skins": {}}

    # Encode image
    image_data = encode_image_base64(image)

    # Prepare messages
    user_query = make_user_query(
        item,
        c_type=c_type,
        use_names=use_names,
        add_tags=add_tags,
        add_characters=add_char_list,
        add_char_tags=add_chars_tags,
        add_description=add_chars_descr,
        underscores_replace=False
    )

    messages = [
        {
            "role": "system",
            "content": [{"type": "text", "text": system_prompt}]
        },
        {
            "role": "user",
            "content": [
                {"type": "image_url", "image_url": {"url": f"data:image/jpeg;base64,{image_data}"}},
                {"type": "text", "text": user_query}
            ]
        }
    ]

    # Call API
    return call_caption_api(messages, api_url, model_name)


def create_ui():
    """Create and return the Gradio interface."""

    with gr.Blocks(title="ToriiGate Captioner", theme=gr.themes.Soft()) as app:
        gr.Markdown("# 🖼️ ToriiGate Captioner")
        
        # API URL row with status
        with gr.Row():
            api_url_input = gr.Textbox(
                label="API URL",
                value=API_URL,
                interactive=True,
                scale=4
            )
            api_status = gr.Textbox(
                label="Status",
                value="⏳ Waiting for input...",
                interactive=False,
                scale=1
            )
            model_name_display = gr.Textbox(
                label="Model",
                value="N/A",
                interactive=False,
                scale=1
            )

        with gr.Row():
            # Left column - Image input
            with gr.Column(scale=1):
                image_input = gr.Image(
                    label="Upload Image",
                    type="pil",
                    height=400
                )
                
                gr.Markdown("### Configuration")
                
                # Caption type selector
                c_type = gr.Dropdown(
                    choices=CAPTION_TYPES,
                    value=DEFAULT_C_TYPE,
                    label="Caption Type",
                    interactive=True
                )
                
                # Boolean options with conditional text inputs
                with gr.Group():
                    use_names = gr.Checkbox(
                        value=True,
                        label="Use Names (enable character names)"
                    )
                    
                    add_tags = gr.Checkbox(
                        value=False,
                        label="Add Tags"
                    )
                    tags_text = gr.Textbox(
                        label="Tags (comma-separated)",
                        placeholder="e.g., 1girl, blue_hair, school_uniform",
                        interactive=False
                    )
                    
                    add_char_list = gr.Checkbox(
                        value=False,
                        label="Add Character List"
                    )
                    characters_text = gr.Textbox(
                        label="Character Names (comma-separated)",
                        placeholder="e.g., nishizono_mio, hoshimi_miyabi",
                        interactive=False
                    )

                    add_chars_tags = gr.Checkbox(
                        value=False,
                        label="Add Character Tags"
                    )
                    
                    with gr.Group(visible=False) as char_tags_group:
                        gr.Markdown("**Add character names and their tags**")
                        
                        with gr.Accordion("Character 1", open=True):
                            char1_name = gr.Textbox(
                                label="Name",
                                placeholder="e.g., albedo",
                                interactive=True
                            )
                            char1_tags = gr.Textbox(
                                label="Tags (comma-separated)",
                                placeholder="e.g., white_hair, green_eyes, horns",
                                interactive=True
                            )
                        
                        with gr.Accordion("Character 2", open=False):
                            char2_name = gr.Textbox(
                                label="Name",
                                placeholder="e.g., hoshimi_miyabi",
                                interactive=True
                            )
                            char2_tags = gr.Textbox(
                                label="Tags (comma-separated)",
                                placeholder="e.g., blue_hair, fox_ears",
                                interactive=True
                            )
                        
                        with gr.Accordion("Character 3", open=False):
                            char3_name = gr.Textbox(
                                label="Name",
                                placeholder="e.g., nishizono_mio",
                                interactive=True
                            )
                            char3_tags = gr.Textbox(
                                label="Tags (comma-separated)",
                                placeholder="e.g., brown_hair, glasses",
                                interactive=True
                            )
                        
                        with gr.Accordion("Character 4", open=False):
                            char4_name = gr.Textbox(
                                label="Name",
                                placeholder="e.g.",
                                interactive=True
                            )
                            char4_tags = gr.Textbox(
                                label="Tags (comma-separated)",
                                placeholder="e.g.",
                                interactive=True
                            )
                        
                        with gr.Accordion("Character 5", open=False):
                            char5_name = gr.Textbox(
                                label="Name",
                                placeholder="e.g.",
                                interactive=True
                            )
                            char5_tags = gr.Textbox(
                                label="Tags (comma-separated)",
                                placeholder="e.g.",
                                interactive=True
                            )
                        
                        char_tags_clear_btn = gr.Button(
                            "🗑️ Clear All",
                            variant="secondary",
                            size="sm"
                        )

                    add_chars_descr = gr.Checkbox(
                        value=False,
                        label="Add Character Descriptions"
                    )
                    
                    with gr.Group(visible=False) as char_descr_group:
                        gr.Markdown("**Add character descriptions**")
                        
                        with gr.Accordion("Character 1", open=True):
                            char_descr1_name = gr.Textbox(
                                label="Name",
                                placeholder="e.g., albedo",
                                interactive=True
                            )
                            char_descr1_text = gr.Textbox(
                                label="Description",
                                placeholder="e.g., Albedo is a curvy woman with...",
                                lines=3,
                                interactive=True
                            )
                        
                        with gr.Accordion("Character 2", open=False):
                            char_descr2_name = gr.Textbox(
                                label="Name",
                                placeholder="e.g., hoshimi_miyabi",
                                interactive=True
                            )
                            char_descr2_text = gr.Textbox(
                                label="Description",
                                placeholder="e.g., Miyabi is a calm and collected...",
                                lines=3,
                                interactive=True
                            )
                        
                        with gr.Accordion("Character 3", open=False):
                            char_descr3_name = gr.Textbox(
                                label="Name",
                                placeholder="e.g., nishizono_mio",
                                interactive=True
                            )
                            char_descr3_text = gr.Textbox(
                                label="Description",
                                placeholder="e.g., Mio is a cheerful girl with...",
                                lines=3,
                                interactive=True
                            )
                        
                        with gr.Accordion("Character 4", open=False):
                            char_descr4_name = gr.Textbox(
                                label="Name",
                                placeholder="e.g.",
                                interactive=True
                            )
                            char_descr4_text = gr.Textbox(
                                label="Description",
                                placeholder="e.g.",
                                lines=3,
                                interactive=True
                            )
                        
                        with gr.Accordion("Character 5", open=False):
                            char_descr5_name = gr.Textbox(
                                label="Name",
                                placeholder="e.g.",
                                interactive=True
                            )
                            char_descr5_text = gr.Textbox(
                                label="Description",
                                placeholder="e.g.",
                                lines=3,
                                interactive=True
                            )
                        
                        char_descr_clear_btn = gr.Button(
                            "🗑️ Clear All",
                            variant="secondary",
                            size="sm"
                        )

                generate_btn = gr.Button("🚀 Generate Caption", variant="primary", size="lg")
            
            # Right column - Output
            with gr.Column(scale=1):
                output_text = gr.Textbox(
                    label="Caption Output",
                    lines=20,
                    max_lines=50,
                    interactive=False
                )
        
        # Toggle text inputs based on checkbox state
        def toggle_input(is_checked: bool, input_component):
            return gr.update(interactive=is_checked)

        add_tags.change(
            lambda x: toggle_input(x, tags_text),
            inputs=add_tags,
            outputs=tags_text
        )

        add_char_list.change(
            lambda x: toggle_input(x, characters_text),
            inputs=add_char_list,
            outputs=characters_text
        )

        add_chars_tags.change(
            fn=lambda x: gr.update(visible=x),
            inputs=add_chars_tags,
            outputs=char_tags_group
        )

        add_chars_descr.change(
            fn=lambda x: gr.update(visible=x),
            inputs=add_chars_descr,
            outputs=char_descr_group
        )

        # API URL change handler
        api_url_input.change(
            fn=check_api_connection,
            inputs=api_url_input,
            outputs=[api_status, model_name_display]
        )

        # Wire up generate button
        generate_btn.click(
            fn=generate_caption,
            inputs=[
                image_input,
                api_url_input,
                model_name_display,
                c_type,
                use_names,
                add_tags,
                add_char_list,
                add_chars_tags,
                add_chars_descr,
                tags_text,
                characters_text,
                char1_name,
                char1_tags,
                char2_name,
                char2_tags,
                char3_name,
                char3_tags,
                char4_name,
                char4_tags,
                char5_name,
                char5_tags,
                char_descr1_name,
                char_descr1_text,
                char_descr2_name,
                char_descr2_text,
                char_descr3_name,
                char_descr3_text,
                char_descr4_name,
                char_descr4_text,
                char_descr5_name,
                char_descr5_text
            ],
            outputs=output_text
        )

        # Clear character tags button handler
        def clear_char_tags():
            return "", "", "", "", "", "", "", "", "", ""
        
        char_tags_clear_btn.click(
            fn=clear_char_tags,
            inputs=[],
            outputs=[
                char1_name, char1_tags,
                char2_name, char2_tags,
                char3_name, char3_tags,
                char4_name, char4_tags,
                char5_name, char5_tags
            ]
        )

        # Clear character descriptions button handler
        def clear_char_descr():
            return "", "", "", "", "", "", "", "", "", ""
        
        char_descr_clear_btn.click(
            fn=clear_char_descr,
            inputs=[],
            outputs=[
                char_descr1_name, char_descr1_text,
                char_descr2_name, char_descr2_text,
                char_descr3_name, char_descr3_text,
                char_descr4_name, char_descr4_text,
                char_descr5_name, char_descr5_text
            ]
        )
    
    return app


if __name__ == "__main__":
    app = create_ui()
    app.launch(server_name="127.0.0.1", server_port=7860)