"""Тёмная тема.

Палитра задаётся через QPalette, а не только через QSS: иначе системные
диалоги и всплывающие подсказки остались бы светлыми и резали глаза.
"""

from __future__ import annotations

from PySide6.QtCore import QLocale, Qt
from PySide6.QtGui import QColor, QPalette

BG = "#1c1f24"
BG_ALT = "#23272e"
SURFACE = "#2b3038"
BORDER = "#3a4048"
TEXT = "#e6e8ea"
TEXT_DIM = "#98a0aa"
ACCENT = "#4c9aff"

OK = "#4caf7d"
WARN = "#d9a441"
DANGER = "#e0605e"
MUTED = "#6c757d"

STATUS_COLORS = {
    "settled": OK,
    "open": ACCENT,
    "due_soon": WARN,
    "overdue": DANGER,
}


def apply(app) -> None:
    app.setStyle("Fusion")

    # Иначе поля ввода показывают «1,800.00», а таблицы рядом — «1 800,00».
    QLocale.setDefault(QLocale(QLocale.Russian, QLocale.Russia))

    palette = QPalette()
    palette.setColor(QPalette.Window, QColor(BG))
    palette.setColor(QPalette.WindowText, QColor(TEXT))
    palette.setColor(QPalette.Base, QColor(BG_ALT))
    palette.setColor(QPalette.AlternateBase, QColor(SURFACE))
    palette.setColor(QPalette.Text, QColor(TEXT))
    palette.setColor(QPalette.Button, QColor(SURFACE))
    palette.setColor(QPalette.ButtonText, QColor(TEXT))
    palette.setColor(QPalette.ToolTipBase, QColor(SURFACE))
    palette.setColor(QPalette.ToolTipText, QColor(TEXT))
    palette.setColor(QPalette.Highlight, QColor(ACCENT))
    palette.setColor(QPalette.HighlightedText, QColor("#ffffff"))
    palette.setColor(QPalette.PlaceholderText, QColor(TEXT_DIM))
    palette.setColor(QPalette.Link, QColor(ACCENT))
    palette.setColor(QPalette.Disabled, QPalette.Text, QColor(MUTED))
    palette.setColor(QPalette.Disabled, QPalette.ButtonText, QColor(MUTED))
    palette.setColor(QPalette.Disabled, QPalette.WindowText, QColor(MUTED))
    app.setPalette(palette)

    app.setStyleSheet(QSS)


QSS = f"""
QWidget {{
    font-size: 13px;
}}

QLabel[role="h1"] {{ font-size: 21px; font-weight: 600; }}
QLabel[role="h2"] {{ font-size: 15px; font-weight: 600; }}
QLabel[role="dim"] {{ color: {TEXT_DIM}; }}
QLabel[role="metric"] {{ font-size: 24px; font-weight: 600; }}

QFrame[role="card"] {{
    background: {SURFACE};
    border: 1px solid {BORDER};
    border-radius: 8px;
}}

QFrame[role="banner"] {{
    background: #3a2f1c;
    border: 1px solid {WARN};
    border-radius: 6px;
}}

QListWidget#sidebar {{
    background: {BG_ALT};
    border: none;
    border-right: 1px solid {BORDER};
    outline: none;
    padding-top: 8px;
}}
QListWidget#sidebar::item {{
    padding: 10px 16px;
    margin: 1px 6px;
    border-radius: 6px;
    color: {TEXT_DIM};
}}
QListWidget#sidebar::item:selected {{
    background: {SURFACE};
    color: {TEXT};
    font-weight: 600;
}}
QListWidget#sidebar::item:hover {{ color: {TEXT}; }}

QPushButton {{
    background: {SURFACE};
    border: 1px solid {BORDER};
    border-radius: 6px;
    padding: 6px 14px;
}}
QPushButton:hover {{ border-color: {ACCENT}; }}
QPushButton:disabled {{ color: {MUTED}; border-color: {BORDER}; }}
QPushButton[role="primary"] {{
    background: {ACCENT};
    border-color: {ACCENT};
    color: #ffffff;
    font-weight: 600;
}}
QPushButton[role="primary"]:hover {{ background: #5aa6ff; }}
QPushButton[role="danger"]:hover {{ border-color: {DANGER}; color: {DANGER}; }}

QLineEdit, QDateEdit, QComboBox, QSpinBox, QDoubleSpinBox, QPlainTextEdit, QTextEdit {{
    background: {BG_ALT};
    border: 1px solid {BORDER};
    border-radius: 6px;
    padding: 5px 8px;
    selection-background-color: {ACCENT};
}}
QLineEdit:focus, QDateEdit:focus, QComboBox:focus,
QSpinBox:focus, QDoubleSpinBox:focus, QPlainTextEdit:focus {{
    border-color: {ACCENT};
}}
QComboBox::drop-down {{ border: none; width: 18px; }}
QComboBox QAbstractItemView {{
    background: {BG_ALT};
    border: 1px solid {BORDER};
    selection-background-color: {ACCENT};
}}

QTableWidget, QTreeWidget {{
    background: {BG_ALT};
    alternate-background-color: {SURFACE};
    border: 1px solid {BORDER};
    border-radius: 6px;
    gridline-color: {BORDER};
    selection-background-color: {ACCENT};
}}
QHeaderView::section {{
    background: {SURFACE};
    color: {TEXT_DIM};
    border: none;
    border-bottom: 1px solid {BORDER};
    padding: 7px 8px;
    font-weight: 600;
}}
QTableWidget::item, QTreeWidget::item {{ padding: 4px 6px; }}

QProgressBar {{
    background: {BG};
    border: 1px solid {BORDER};
    border-radius: 6px;
    height: 14px;
    text-align: center;
    color: {TEXT};
}}
QProgressBar::chunk {{ border-radius: 5px; }}

QStatusBar {{ border-top: 1px solid {BORDER}; }}
QStatusBar::item {{ border: none; }}

QScrollBar:vertical {{ background: transparent; width: 10px; margin: 0; }}
QScrollBar::handle:vertical {{ background: {BORDER}; border-radius: 5px; min-height: 30px; }}
QScrollBar::handle:vertical:hover {{ background: {MUTED}; }}
QScrollBar::add-line, QScrollBar::sub-line {{ height: 0; width: 0; }}
QScrollBar:horizontal {{ background: transparent; height: 10px; }}
QScrollBar::handle:horizontal {{ background: {BORDER}; border-radius: 5px; min-width: 30px; }}

QTabWidget::pane {{ border: 1px solid {BORDER}; border-radius: 6px; }}
QTabBar::tab {{
    background: transparent;
    padding: 7px 14px;
    color: {TEXT_DIM};
    border-bottom: 2px solid transparent;
}}
QTabBar::tab:selected {{ color: {TEXT}; border-bottom-color: {ACCENT}; }}
"""