backend/theme.py

"""Custom Gradio theme for Portfolio Intelligence Platform.

Professional financial application theme with:
- Trust-inspiring blue/grey colour palette
- Clean typography with Inter font
- Subtle shadows and borders
- Optimised for data-heavy interfaces
"""

import gradio as gr
from gradio.themes.base import Base
from gradio.themes.utils import colors, fonts, sizes


class FinancialTheme(Base):
    """Professional financial application theme for Gradio."""

    def __init__(self, **kwargs):
        """Initialise financial theme with professional colours and typography."""
        super().__init__(
            # Trust & stability colours
            primary_hue=colors.blue,      # Professional blue
            secondary_hue=colors.slate,   # Neutral greys
            neutral_hue=colors.gray,

            # Professional sizing
            spacing_size=sizes.spacing_md,
            radius_size=sizes.radius_sm,  # Subtle rounded corners
            text_size=sizes.text_lg,      # Readable text

            # Professional fonts
            font=fonts.GoogleFont("Inter"),  # Clean sans-serif
            font_mono=fonts.GoogleFont("IBM Plex Mono")
        )

        # Custom colour overrides
        super().set(
            # Background
            body_background_fill="#f8f9fa",
            body_background_fill_dark="#1a1a1a",

            # Primary buttons
            button_primary_background_fill="#288cfa",
            button_primary_background_fill_hover="#1a7de8",
            button_primary_text_color="white",
            button_primary_shadow="0 2px 4px rgba(40, 140, 250, 0.2)",
            button_primary_border_color="#288cfa",

            # Secondary buttons
            button_secondary_background_fill="white",
            button_secondary_background_fill_hover="#f8f9fa",
            button_secondary_text_color="#288cfa",
            button_secondary_border_color="#dee2e6",

            # Card/block styling
            block_background_fill="white",
            block_border_width="1px",
            block_border_color="#e5e7eb",
            block_shadow="0 1px 3px 0 rgba(0, 0, 0, 0.1)",
            block_title_text_weight="600",
            block_title_text_color="#242c34",
            block_label_text_weight="500",
            block_label_text_color="#6b7280",

            # Input styling
            input_background_fill="white",
            input_border_color="#d1d5db",
            input_shadow="0 1px 2px 0 rgba(0, 0, 0, 0.05)",
            input_border_width="1px",

            # Checkbox/radio
            checkbox_border_color="#d1d5db",
            checkbox_background_color="white",

            # Status colours
            color_accent_soft="#10b981",  # Green for positive
            stat_background_fill="#fef3c7",  # Subtle yellow for highlights

            # Progress bar
            loader_color="#288cfa",
            slider_color="#288cfa",

            # Table styling
            table_border_color="#e5e7eb",
            table_odd_background_fill="#f9fafb",
            table_even_background_fill="white",

            # Panel styling
            panel_background_fill="white",
            panel_border_color="#e5e7eb",
            panel_border_width="1px",
        )


# Custom CSS for additional styling (theme-adaptive with dark mode improvements)
FINANCIAL_CSS = """
/* Global container styling */
.gradio-container {
    font-family: 'Inter', 'Arial', sans-serif;
    max-width: 1400px;
    margin: auto;
}

/* Adaptive container background - follows HuggingFace Spaces theme */
.gradio-container {
    background: var(--body-background-fill);
}

/* Clean input styling - theme adaptive */
input,
textarea {
    background-color: var(--input-background-fill);
    border: 1px solid var(--input-border-color);
    border-radius: 8px;
}

input:focus-visible,
textarea:focus-visible {
    outline: 3px solid var(--button-primary-background-fill);
    outline-offset: 2px;
    border-radius: 2px;
    opacity: 1 !important;
}

input:focus,
textarea:focus {
    opacity: 1 !important;
    border-color: var(--button-primary-background-fill);
    box-shadow: 0 0 0 3px var(--button-primary-background-fill-hover);
}

/* Group/card styling with subtle shadows - theme adaptive */
.gr-group,
.gr-box {
    background-color: var(--block-background-fill);
    border: 1px solid var(--block-border-color);
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

/* Button styling - theme adaptive */
.gr-button {
    border-radius: 8px;
}

.gr-button-primary {
    background: var(--button-primary-background-fill);
    border: none;
    color: var(--button-primary-text-color);
    font-weight: 600;
}

.gr-button-primary:hover {
    background: var(--button-primary-background-fill-hover);
}

/* Example portfolio cards - theme adaptive */
.gr-examples {
    background-color: var(--block-background-fill);
    border: 1px solid var(--block-border-color);
    border-radius: 8px;
}

.gr-examples button {
    background-color: var(--button-secondary-background-fill);
    border: 1px solid var(--button-secondary-border-color);
}

.gr-examples button:hover {
    background-color: var(--button-secondary-background-fill-hover);
    border-color: var(--button-primary-background-fill);
}

/* Header styling - theme adaptive */
.header h1 {
    color: var(--body-text-color);
    font-weight: 700;
    letter-spacing: -0.025em;
    margin-bottom: 0.5rem;
}

.header h3 {
    color: var(--body-text-color);
    opacity: 0.7;
    font-weight: 400;
    margin-top: 0;
}

.markdown-text h1 {
    font-weight: 600;
    border-bottom: 2px solid var(--color-accent);
    padding-bottom: 0.5rem;
    margin-bottom: 1rem;
}

.markdown-text h2 {
    font-weight: 600;
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
}

.markdown-text h3 {
    font-weight: 500;
    margin-top: 1rem;
    margin-bottom: 0.5rem;
    opacity: 0.8;
}

/* Metric cards */
.metrics-row {
    gap: 1rem;
}

.metric-card {
    padding: 1.5rem;
    border-radius: 8px;
}

.metric-card .label {
    font-size: 0.875rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
    opacity: 0.7;
}

.metric-card .value {
    font-size: 2rem;
    font-weight: 600;
}

/* Status colours */
.positive {
    color: #10b981;
    font-weight: 600;
}

.negative {
    color: #ef4444;
    font-weight: 600;
}

.neutral {
    font-weight: 500;
    opacity: 0.7;
}

/* Data tables */
.dataframe {
    border-radius: 6px;
    overflow: hidden;
}

.dataframe th {
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
}

/* Button enhancements */
.primary.lg {
    padding: 0.75rem 2rem;
    font-weight: 600;
    font-size: 1.125rem;
}

/* Progress bar */
.progress-bar {
    background: linear-gradient(90deg, var(--color-accent), var(--color-accent-soft));
}

/* Accordion styling for ChatMessage metadata */
.message-metadata {
    border-left: 3px solid var(--color-accent);
    padding-left: 1rem;
    margin: 0.5rem 0;
    border-radius: 4px;
    padding: 0.75rem 1rem;
}

.message-metadata .title {
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.message-metadata .log {
    font-size: 0.875rem;
    opacity: 0.7;
}

/* Tool call status indicators */
.status-pending {
    color: #f59e0b;
}

.status-done {
    color: #10b981;
}

.status-error {
    color: #ef4444;
}

/* Loading spinner */
.loading {
    border: 3px solid var(--border-color-primary);
    border-top-color: var(--color-accent);
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Responsive design */
@media (max-width: 768px) {
    .gradio-container {
        padding: 1rem;
    }

    .metric-card .value {
        font-size: 1.5rem;
    }
}

/* Chart containers */
.plotly-chart {
    border-radius: 8px;
    padding: 1rem;
}

/* Tab styling */
.tab-nav button.selected {
    border-bottom: 2px solid var(--color-accent);
    color: var(--color-accent);
    font-weight: 600;
}

/* Error messages - theme adaptive */
.error-message {
    background: var(--error-background-fill, #fee2e2);
    border-left: 4px solid var(--error-border-color, #ef4444);
    padding: 1rem;
    border-radius: 4px;
    color: var(--error-text-color, #991b1b);
}

.dark .error-message {
    background: var(--error-background-fill-dark, #450a0a);
    color: var(--error-text-color-dark, #fca5a5);
}

/* Success messages - theme adaptive */
.success-message {
    background: var(--color-accent-soft-background, #d1fae5);
    border-left: 4px solid var(--color-accent-soft, #10b981);
    padding: 1rem;
    border-radius: 4px;
    color: var(--color-accent-soft-text, #065f46);
}

.dark .success-message {
    background: var(--color-accent-soft-background-dark, #064e3b);
    color: var(--color-accent-soft-text-dark, #6ee7b7);
}

/* Info messages - theme adaptive */
.info-message {
    background: var(--info-background-fill, #dbeafe);
    border-left: 4px solid var(--button-primary-background-fill, #3b82f6);
    padding: 1rem;
    border-radius: 4px;
    color: var(--info-text-color, #1e40af);
}

.dark .info-message {
    background: var(--info-background-fill-dark, #1e3a8a);
    color: var(--info-text-color-dark, #93c5fd);
}
"""


def get_financial_theme() -> gr.Theme:
    """Get the financial theme instance.

    Returns:
        Configured FinancialTheme instance
    """
    return FinancialTheme()