"""FDAM AI Pipeline - Fire Damage Assessment Methodology v4.0.1

Main Gradio application entry point with session state and chat functionality.
Simplified UI: 2 tabs (Input + Results/Chat).
"""

import gradio as gr

from config.logging import setup_logging
from config.settings import settings

# Initialize logging before any other imports that might log
setup_logging(settings.log_level)

import logging
logger = logging.getLogger(__name__)

from models.loader import get_models
from ui.state import SessionState, create_new_session
from ui.storage import get_head_html
from ui.tabs import input_tab, results_tab
from ui import samples
from pipeline.chat import ChatHandler, get_quick_action_message


# Keyboard shortcuts JavaScript (Ctrl+1-2 for tab navigation)
KEYBOARD_JS = """
<script>
document.addEventListener('keydown', (e) => {
    if (e.ctrlKey && e.key >= '1' && e.key <= '2') {
        e.preventDefault();
        const tabIds = ['tab-input-button', 'tab-results-button'];
        const tabIndex = parseInt(e.key) - 1;
        const tabButton = document.getElementById(tabIds[tabIndex]);
        if (tabButton) {
            tabButton.click();
        }
    }
});
</script>
"""

# Validation CSS classes
VALIDATION_CSS = """
.valid-field input, .valid-field textarea {
    border-color: #66bb6a !important;
}
.invalid-field input, .invalid-field textarea {
    border-color: #ef5350 !important;
}
"""


def ensure_rag_index():
    """Ensure RAG index is built. Builds on first run if empty."""
    from pathlib import Path
    try:
        # Check if index exists and has content
        chroma_path = Path(__file__).parent / "chroma_db"
        if not chroma_path.exists() or not any(chroma_path.iterdir()):
            logger.info("RAG index empty or missing - building from RAG-KB...")
            from rag.index_builder import build_index
            stats = build_index(rebuild=False)
            logger.info(f"RAG index built: {stats['chunks_created']} chunks from {stats['documents_processed']} documents")
        else:
            logger.info("RAG index found")
    except Exception as e:
        logger.warning(f"RAG index build failed (will use fallback): {e}")


def create_app() -> gr.Blocks:
    """Create the main Gradio application."""

    # Initialize models at startup
    model_stack = get_models()

    # Ensure RAG index is built (builds on first run)
    ensure_rag_index()

    # Initialize chat handler
    chat_handler = ChatHandler(model_stack)

    with gr.Blocks(
        title="FDAM AI Pipeline - Fire Damage Assessment",
        css=VALIDATION_CSS,
        head=get_head_html(KEYBOARD_JS),
    ) as app:
        # Session state (stored in Gradio State component)
        session_state = gr.State(value=create_new_session())

        # Header
        gr.Markdown(
            """
            # FDAM AI Pipeline
            ## Fire Damage Assessment Methodology v4.0.1

            Upload images and room information to generate a professional
            Cleaning Specification / Scope of Work.
            """
        )

        # Mode indicator
        if settings.mock_models:
            gr.Markdown(
                """
                > **Development Mode**: Using mock models for testing.
                > Set `MOCK_MODELS=false` for production inference.
                """
            )

        # Sample loader dropdown
        with gr.Row():
            sample_dropdown = gr.Dropdown(
                label="Load Sample",
                choices=samples.get_sample_choices(),
                value="",
                elem_id="sample_dropdown",
                scale=2,
            )
            sample_status = gr.HTML(
                value="",
                elem_id="sample_status",
            )

        # Tab navigation (2 tabs)
        with gr.Tabs() as tabs:
            # Tab 1: Input (combined room + images + observations)
            tab_input = gr.Tab("1. Input", id=0, elem_id="tab-input")
            with tab_input:
                tab1 = input_tab.create_tab()

            # Tab 2: Results + Chat
            tab_results = gr.Tab("2. Results", id=1, elem_id="tab-results")
            with tab_results:
                tab2 = results_tab.create_tab()

        # --- Event Handlers ---

        # Sample Loader
        def handle_sample_load(scenario_id: str, current_session: SessionState):
            """Handle sample dropdown selection."""
            if not scenario_id:
                return (
                    current_session,
                    *input_tab.load_room_from_session(current_session),
                    *input_tab.load_images_from_session(current_session),
                    *input_tab.load_observations_from_session(current_session),
                    gr.update(),
                    "",
                    "",
                )

            # Load the sample
            new_session = samples.load_sample(scenario_id)
            if not new_session:
                return (
                    current_session,
                    *input_tab.load_room_from_session(current_session),
                    *input_tab.load_images_from_session(current_session),
                    *input_tab.load_observations_from_session(current_session),
                    gr.update(),
                    '<span style="color: #c62828;">Error: Sample not found</span>',
                    "",
                )

            # Get scenario name for status message
            scenario = samples.get_scenario_by_id(scenario_id)
            name = scenario.name if scenario else scenario_id

            # Load form values from new session
            room_values = input_tab.load_room_from_session(new_session)
            image_values = input_tab.load_images_from_session(new_session)
            obs_values = input_tab.load_observations_from_session(new_session)

            return (
                new_session,
                *room_values,
                *image_values,
                *obs_values,
                gr.update(selected=0),  # Stay on Input tab
                f'<span style="color: #2e7d32;">Loaded sample: {name}</span>',
                "",  # reset dropdown
            )

        sample_dropdown.change(
            fn=handle_sample_load,
            inputs=[sample_dropdown, session_state],
            outputs=[
                session_state,
                # Room outputs (9)
                tab1["room_name"],
                tab1["room_length"],
                tab1["room_width"],
                tab1["room_height_preset"],
                tab1["room_height_custom"],
                tab1["floor_area"],
                tab1["room_volume"],
                tab1["facility_classification"],
                tab1["construction_era"],
                # Image outputs (3)
                tab1["images_gallery"],
                tab1["image_count"],
                tab1["resume_warning"],
                # Observation outputs (15)
                tab1["smoke_odor"],
                tab1["odor_intensity"],
                tab1["visible_soot"],
                tab1["soot_description"],
                tab1["large_char"],
                tab1["char_density"],
                tab1["ash_residue"],
                tab1["ash_description"],
                tab1["surface_discoloration"],
                tab1["discoloration_description"],
                tab1["dust_interference"],
                tab1["dust_notes"],
                tab1["wildfire_indicators"],
                tab1["wildfire_notes"],
                tab1["additional_notes"],
                # Navigation
                tabs,
                sample_status,
                sample_dropdown,
            ],
        )

        # --- Tab 1: Input ---

        # Room field changes - save to session and update calculations
        def on_room_field_change(
            session: SessionState,
            name: str,
            length: float | None,
            width: float | None,
            height_preset: int | None,
            height_custom: float | None,
            facility_classification: str,
            construction_era: str,
        ):
            """Save room data and update calculated values."""
            updated_session = input_tab.save_room_to_session(
                session, name, length, width, height_preset, height_custom,
                facility_classification, construction_era
            )
            floor_area, volume = input_tab.update_calculated_values(
                length, width, height_preset, height_custom
            )
            return updated_session, floor_area, volume

        room_inputs = [
            session_state,
            tab1["room_name"],
            tab1["room_length"],
            tab1["room_width"],
            tab1["room_height_preset"],
            tab1["room_height_custom"],
            tab1["facility_classification"],
            tab1["construction_era"],
        ]
        room_outputs = [session_state, tab1["floor_area"], tab1["room_volume"]]

        for input_component in [
            tab1["room_name"],
            tab1["room_length"],
            tab1["room_width"],
            tab1["room_height_preset"],
            tab1["room_height_custom"],
            tab1["facility_classification"],
            tab1["construction_era"],
        ]:
            input_component.change(
                fn=on_room_field_change,
                inputs=room_inputs,
                outputs=room_outputs,
            )

        # Show/hide custom height input
        tab1["room_height_preset"].change(
            fn=input_tab.on_height_preset_change,
            inputs=[tab1["room_height_preset"]],
            outputs=[tab1["room_height_custom"]],
        )

        # Image handling
        tab1["add_image_btn"].click(
            fn=input_tab.add_image,
            inputs=[
                session_state,
                tab1["image_upload"],
                tab1["image_description"],
            ],
            outputs=[
                session_state,
                tab1["images_gallery"],
                tab1["validation_status"],
                tab1["image_count"],
                tab1["image_upload"],
                tab1["image_description"],
            ],
        )

        tab1["clear_upload_btn"].click(
            fn=lambda: (None, ""),
            outputs=[
                tab1["image_upload"],
                tab1["image_description"],
            ],
        )

        tab1["remove_last_btn"].click(
            fn=input_tab.remove_last_image,
            inputs=[session_state],
            outputs=[
                session_state,
                tab1["images_gallery"],
                tab1["validation_status"],
                tab1["image_count"],
            ],
        )

        tab1["clear_all_btn"].click(
            fn=input_tab.clear_all_images,
            inputs=[session_state],
            outputs=[
                session_state,
                tab1["images_gallery"],
                tab1["validation_status"],
                tab1["image_count"],
            ],
        )

        # Generate button - validate and switch to results
        def on_generate_click(
            session: SessionState,
            smoke_odor: bool,
            odor_intensity: str,
            visible_soot: bool,
            soot_description: str,
            large_char: bool,
            char_density: str,
            ash_residue: bool,
            ash_description: str,
            surface_discoloration: bool,
            discoloration_description: str,
            dust_interference: bool,
            dust_notes: str,
            wildfire_indicators: bool,
            wildfire_notes: str,
            additional_notes: str,
        ):
            """Save observations and validate before generating."""
            # Save observations first
            session = input_tab.save_observations_to_session(
                session,
                smoke_odor, odor_intensity, visible_soot, soot_description,
                large_char, char_density, ash_residue, ash_description,
                surface_discoloration, discoloration_description,
                dust_interference, dust_notes, wildfire_indicators,
                wildfire_notes, additional_notes,
            )
            # Validate and potentially switch tabs
            return input_tab.validate_and_generate(session)

        tab1["generate_btn"].click(
            fn=on_generate_click,
            inputs=[
                session_state,
                tab1["smoke_odor"],
                tab1["odor_intensity"],
                tab1["visible_soot"],
                tab1["soot_description"],
                tab1["large_char"],
                tab1["char_density"],
                tab1["ash_residue"],
                tab1["ash_description"],
                tab1["surface_discoloration"],
                tab1["discoloration_description"],
                tab1["dust_interference"],
                tab1["dust_notes"],
                tab1["wildfire_indicators"],
                tab1["wildfire_notes"],
                tab1["additional_notes"],
            ],
            outputs=[
                session_state,
                tab1["validation_status"],
                tabs,
            ],
        )

        # --- Tab 2: Results + Chat ---

        # Generate assessment
        tab2["generate_btn"].click(
            fn=results_tab.generate_assessment,
            inputs=[session_state],
            outputs=[
                session_state,
                tab2["processing_status"],
                tab2["progress_html"],
                tab2["annotated_gallery"],
                tab2["stats_output"],
                tab2["sow_output"],
                tab2["download_md"],
                tab2["download_pdf"],
                tab2["chatbot"],
            ],
        )

        tab2["regenerate_btn"].click(
            fn=results_tab.generate_assessment,
            inputs=[session_state],
            outputs=[
                session_state,
                tab2["processing_status"],
                tab2["progress_html"],
                tab2["annotated_gallery"],
                tab2["stats_output"],
                tab2["sow_output"],
                tab2["download_md"],
                tab2["download_pdf"],
                tab2["chatbot"],
            ],
        )

        # Back to input
        tab2["back_btn"].click(
            fn=lambda: gr.update(selected=0),
            outputs=[tabs],
        )

        # Reset document
        def on_reset_document(session: SessionState):
            """Reset document to original and regenerate downloads."""
            session, doc = results_tab.reset_document(session)
            md_path, pdf_path = results_tab.regenerate_downloads(session)
            return session, doc, md_path, pdf_path

        tab2["reset_doc_btn"].click(
            fn=on_reset_document,
            inputs=[session_state],
            outputs=[
                session_state,
                tab2["sow_output"],
                tab2["download_md"],
                tab2["download_pdf"],
            ],
        )

        # Chat functionality
        def handle_chat_message(
            message: str,
            session: SessionState,
            chat_history: list[dict],
        ):
            """Process chat message and update UI."""
            if not message.strip():
                return session, chat_history, "", session.generated_document or "", None, None

            response, edit, updated_history = chat_handler.process_message(
                message, session, chat_history
            )

            # Apply document edit if present
            if edit and session.generated_document:
                session.generated_document = chat_handler.apply_document_edit(
                    session.generated_document, edit
                )
                session.update_timestamp()
                # Regenerate downloads
                md_path, pdf_path = results_tab.regenerate_downloads(session)
            else:
                md_path, pdf_path = None, None

            # Store chat history in session
            session.chat_history = updated_history

            return (
                session,
                updated_history,
                "",  # Clear input
                session.generated_document or "",
                md_path,
                pdf_path,
            )

        # Chat send button
        tab2["chat_send_btn"].click(
            fn=handle_chat_message,
            inputs=[tab2["chat_input"], session_state, tab2["chatbot"]],
            outputs=[
                session_state,
                tab2["chatbot"],
                tab2["chat_input"],
                tab2["sow_output"],
                tab2["download_md"],
                tab2["download_pdf"],
            ],
        )

        # Chat input enter key
        tab2["chat_input"].submit(
            fn=handle_chat_message,
            inputs=[tab2["chat_input"], session_state, tab2["chatbot"]],
            outputs=[
                session_state,
                tab2["chatbot"],
                tab2["chat_input"],
                tab2["sow_output"],
                tab2["download_md"],
                tab2["download_pdf"],
            ],
        )

        # Quick action buttons
        def send_quick_action(action_key: str, session: SessionState, chat_history: list[dict]):
            """Send a quick action message."""
            message = get_quick_action_message(action_key)
            return handle_chat_message(message, session, chat_history)

        tab2["quick_explain_zones"].click(
            fn=lambda s, h: send_quick_action("explain_zones", s, h),
            inputs=[session_state, tab2["chatbot"]],
            outputs=[
                session_state,
                tab2["chatbot"],
                tab2["chat_input"],
                tab2["sow_output"],
                tab2["download_md"],
                tab2["download_pdf"],
            ],
        )

        tab2["quick_explain_materials"].click(
            fn=lambda s, h: send_quick_action("explain_materials", s, h),
            inputs=[session_state, tab2["chatbot"]],
            outputs=[
                session_state,
                tab2["chatbot"],
                tab2["chat_input"],
                tab2["sow_output"],
                tab2["download_md"],
                tab2["download_pdf"],
            ],
        )

        tab2["quick_sampling"].click(
            fn=lambda s, h: send_quick_action("explain_sampling", s, h),
            inputs=[session_state, tab2["chatbot"]],
            outputs=[
                session_state,
                tab2["chatbot"],
                tab2["chat_input"],
                tab2["sow_output"],
                tab2["download_md"],
                tab2["download_pdf"],
            ],
        )

        tab2["quick_add_note"].click(
            fn=lambda s, h: send_quick_action("add_note", s, h),
            inputs=[session_state, tab2["chatbot"]],
            outputs=[
                session_state,
                tab2["chatbot"],
                tab2["chat_input"],
                tab2["sow_output"],
                tab2["download_md"],
                tab2["download_pdf"],
            ],
        )

        # --- Tab Select Handlers ---

        # Load data when switching to Input tab
        def load_input_tab(session: SessionState):
            """Load all input data when tab is selected."""
            room_values = input_tab.load_room_from_session(session)
            image_values = input_tab.load_images_from_session(session)
            obs_values = input_tab.load_observations_from_session(session)
            return (*room_values, *image_values, *obs_values)

        tab_input.select(
            fn=load_input_tab,
            inputs=[session_state],
            outputs=[
                # Room (9)
                tab1["room_name"],
                tab1["room_length"],
                tab1["room_width"],
                tab1["room_height_preset"],
                tab1["room_height_custom"],
                tab1["floor_area"],
                tab1["room_volume"],
                tab1["facility_classification"],
                tab1["construction_era"],
                # Images (3)
                tab1["images_gallery"],
                tab1["image_count"],
                tab1["resume_warning"],
                # Observations (15)
                tab1["smoke_odor"],
                tab1["odor_intensity"],
                tab1["visible_soot"],
                tab1["soot_description"],
                tab1["large_char"],
                tab1["char_density"],
                tab1["ash_residue"],
                tab1["ash_description"],
                tab1["surface_discoloration"],
                tab1["discoloration_description"],
                tab1["dust_interference"],
                tab1["dust_notes"],
                tab1["wildfire_indicators"],
                tab1["wildfire_notes"],
                tab1["additional_notes"],
            ],
        )

        # Load data when switching to Results tab
        def load_results_tab(session: SessionState):
            """Load results data when tab is selected."""
            doc = session.generated_document or "*Generate an assessment to see results here.*"
            chat = session.chat_history or []
            return doc, chat

        tab_results.select(
            fn=load_results_tab,
            inputs=[session_state],
            outputs=[
                tab2["sow_output"],
                tab2["chatbot"],
            ],
        )

    return app


def main():
    """Entry point for the application."""
    logger.info("Starting FDAM AI Pipeline v4.0.1")
    logger.info(f"Mock models: {settings.mock_models}")
    logger.info(f"Log level: {settings.log_level}")
    logger.info(f"Server: {settings.server_host}:{settings.server_port}")

    app = create_app()
    app.launch(
        server_name=settings.server_host,
        server_port=settings.server_port,
        share=False,
    )


if __name__ == "__main__":
    main()