"""Centralized color palette + minimal CSS tweaks for the dashboard.

Only essential overrides live here. No custom theming beyond the palette
constants the brief permits. ``apply_global_styles`` is called once from
``app.py`` on first render.
"""

from __future__ import annotations

import streamlit as st

# Single source of truth for source-coloring across every chart on every page.
# Keep these in sync with the constants imported in ``plots.py``.
MAEST_COLOR = "#5B5EA6"
CLAP_COLOR = "#1FB3A5"
MUQ_COLOR = "#9B5DE5"
MUQ_REVIEW_COLOR = "#C77DFF"
PASST_COLOR = "#F59E0B"
TAXONOMY_ADAPTER_COLOR = "#2563EB"
LYRICS_COLOR = "#E07B39"
STEM_COLOR = "#E07B39"
# Theme tags from the lyrics-llm extractor (Tier 2). Sage green deliberately
# sits outside the MAEST indigo / CLAP teal / Whisper orange palette so the
# fifth tag category is immediately distinguishable in small-multiples.
THEME_COLOR = "#8DAA7B"

# Neutral chrome.
INK_COLOR = "#1F2933"
MUTED_COLOR = "#6B7280"
ACCENT_BG = "#F5F7FA"
CARD_BG = "#FFFFFF"
DIVIDER = "#E5E7EB"

# Category color (used when a chart isn't source-split but category-split).
CATEGORY_COLORS = {
    "genre": "#5B5EA6",
    "mood": "#9B5DE5",
    "instrument": "#1FB3A5",
    "vocal": "#E07B39",
    "other": "#6B7280",
}

# Reviewer badge palette (taxonomy "open questions" cards).
REVIEWER_COLORS = {
    "Aran": "#5B5EA6",
    "Murat": "#1FB3A5",
    "Emre": "#E07B39",
}


_GLOBAL_CSS = """
<style>
/* Tighten the default Streamlit padding so wide content breathes. */
.main .block-container {
    padding-top: 1.4rem;
    padding-bottom: 3rem;
    max-width: 1400px;
}

/* Cards used on the overview and track pages. */
.sync-card {
    background: #FFFFFF;
    border: 1px solid #E5E7EB;
    border-radius: 12px;
    padding: 18px 20px;
    margin-bottom: 14px;
}
.sync-card h4 {
    margin: 0 0 8px 0;
    font-size: 0.95rem;
    color: #1F2933;
    font-weight: 600;
    letter-spacing: 0.02em;
    text-transform: uppercase;
}

/* Ground-truth panel — wider, with a left accent stripe and theme-agnostic
   colours. The explicit white background protects the body text from
   becoming invisible when Streamlit auto-picks the user's dark OS theme. */
.sync-gt-card {
    background: #FFFFFF;
    border: 1px solid #E5E7EB;
    border-left: 4px solid #5B5EA6;
    border-radius: 10px;
    padding: 18px 22px 6px 22px;
    margin-bottom: 18px;
    box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
}
.sync-gt-card .sync-gt-label {
    font-size: 0.74rem;
    color: #6B7280;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    font-weight: 600;
}
.sync-gt-card .sync-gt-value {
    font-size: 1.0rem;
    color: #0F172A;
    font-weight: 500;
    line-height: 1.35;
}
.sync-gt-card .sync-gt-value-muted {
    color: #9CA3AF;
    font-weight: 400;
    font-style: italic;
}

/* Quiet header eyebrow above page titles. */
.sync-eyebrow {
    font-size: 0.75rem;
    color: #6B7280;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    margin-bottom: 4px;
}

.sync-track-picker-eyebrow {
    margin: 0 0 6px 0;
    color: #94A3B8;
    font-size: 0.76rem;
    font-weight: 750;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}
.sync-track-picker-summary {
    margin: 6px 0 10px 0;
    color: #94A3B8;
    font-size: 0.88rem;
}
.sync-track-picker-summary strong {
    color: #E5E7EB;
    font-weight: 750;
}
.sync-track-picker-summary code {
    color: #6EE7B7;
    background: rgba(16, 185, 129, 0.10);
    border-radius: 5px;
    padding: 2px 6px;
}

/* Description blockquote on the track page. */
.sync-description {
    background: #F5F7FA;
    border-left: 4px solid #5B5EA6;
    padding: 14px 18px;
    border-radius: 4px;
    font-size: 1.02rem;
    line-height: 1.55;
    color: #1F2933;
    font-style: italic;
}

.sync-youtube-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin: 2px 0 10px 0;
    padding: 5px 11px;
    border: 1px solid #CBD5E1;
    border-radius: 999px;
    color: #334155 !important;
    background: #F8FAFC;
    font-size: 0.86rem;
    font-weight: 650;
    text-decoration: none !important;
}
.sync-youtube-link:hover {
    border-color: #94A3B8;
    background: #F1F5F9;
    color: #0F172A !important;
}

.sync-brief {
    background: #EFF6FF;
    border-left: 4px solid #2563EB;
    padding: 14px 18px;
    border-radius: 4px;
    font-size: 1.02rem;
    line-height: 1.55;
    color: #1E3A8A;
}

/* Reviewer badge (taxonomy open-questions page). */
.sync-badge {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 600;
    color: white;
    letter-spacing: 0.04em;
    margin-right: 6px;
}

/* Confidence pill — used inline next to GT field values. Bordered and
   weighted for legibility against a white card, with each confidence level
   carrying both a hue and a saturation step so they're distinguishable in
   greyscale / colour-blind viewing too. */
.sync-pill {
    display: inline-block;
    padding: 2px 9px;
    border-radius: 999px;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    margin-left: 8px;
    vertical-align: middle;
    border: 1px solid transparent;
    line-height: 1.4;
}
.sync-pill-high {
    background: #ECFDF5;
    color: #065F46;
    border-color: #6EE7B7;
}
.sync-pill-medium {
    background: #FEF3C7;
    color: #92400E;
    border-color: #FCD34D;
}
.sync-pill-low {
    background: #FFEDD5;
    color: #9A3412;
    border-color: #FDBA74;
}
.sync-pill-uncertain {
    background: #F1F5F9;
    color: #475569;
    border-color: #CBD5E1;
}
.sync-pill-alert {
    background: #FEE2E2;
    color: #991B1B;
    border-color: #FCA5A5;
}

/* Instrumentation / category chips — deeper indigo than before so the
   chip stands out cleanly on the white card without competing with the
   accent stripe colour. */
.sync-chip {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 999px;
    background: #EEF2FF;
    color: #3730A3;
    border: 1px solid #C7D2FE;
    font-size: 0.84rem;
    font-weight: 500;
    margin: 3px 6px 3px 0;
}

/* Stat cell on overview pipeline grid. */
.sync-stat {
    display: flex;
    flex-direction: column;
    gap: 2px;
}
.sync-stat-label {
    font-size: 0.72rem;
    color: #6B7280;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}
.sync-stat-value {
    font-size: 1.35rem;
    color: #1F2933;
    font-weight: 600;
}
.sync-stat-sub {
    font-size: 0.78rem;
    color: #6B7280;
}
</style>
"""


def apply_global_styles() -> None:
    """Inject the small set of CSS overrides we rely on.

    Idempotent — safe to call from every page; Streamlit's rerun model means
    pages re-execute top-to-bottom anyway.
    """
    st.markdown(_GLOBAL_CSS, unsafe_allow_html=True)