"""모노크롬 라인 아이콘 (Lucide 스타일) — 테마 색으로 틴팅한 QIcon 생성.

이모지를 대체하는 세련된 벡터 아이콘. QtSvg로 24x24 stroke path를 렌더링하고
(name, color, size)별로 캐시. 색은 호출 시점의 테마 색을 받으므로 테마 전환 시
재호출하면 자동으로 재틴팅된다.

사용:
    from ui.icons import get_icon
    btn.setIcon(get_icon('settings'))            # 기본: text_secondary 색
    btn.setIcon(get_icon('logout', '#FFFFFF'))   # 색 지정
"""
from __future__ import annotations

from PyQt5.QtCore import QByteArray, QRectF, Qt
from PyQt5.QtGui import QIcon, QPixmap, QPainter
from PyQt5.QtSvg import QSvgRenderer

from ui.styles import ThemeColors

# 24x24 viewBox 기준 내부 path 마크업 (Lucide). stroke 기반, fill 없음.
_PATHS = {
    'chart': '<line x1="18" y1="20" x2="18" y2="10"/><line x1="12" y1="20" x2="12" y2="4"/><line x1="6" y1="20" x2="6" y2="14"/>',
    'calendar': '<rect x="3" y="4" width="18" height="18" rx="2"/><line x1="16" y1="2" x2="16" y2="6"/><line x1="8" y1="2" x2="8" y2="6"/><line x1="3" y1="10" x2="21" y2="10"/>',
    'report': '<path d="M14.5 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V7.5L14.5 2z"/><polyline points="14 2 14 8 20 8"/><line x1="16" y1="13" x2="8" y2="13"/><line x1="16" y1="17" x2="8" y2="17"/><line x1="10" y1="9" x2="8" y2="9"/>',
    'award': '<circle cx="12" cy="8" r="6"/><path d="M15.477 12.89 17 22l-5-3-5 3 1.523-9.11"/>',
    'help': '<circle cx="12" cy="12" r="10"/><path d="M9.09 9a3 3 0 0 1 5.83 1c0 2-3 3-3 3"/><line x1="12" y1="17" x2="12.01" y2="17"/>',
    'settings': '<path d="M12.22 2h-.44a2 2 0 0 0-2 2v.18a2 2 0 0 1-1 1.73l-.43.25a2 2 0 0 1-2 0l-.15-.08a2 2 0 0 0-2.73.73l-.22.38a2 2 0 0 0 .73 2.73l.15.1a2 2 0 0 1 1 1.72v.51a2 2 0 0 1-1 1.74l-.15.09a2 2 0 0 0-.73 2.73l.22.38a2 2 0 0 0 2.73.73l.15-.08a2 2 0 0 1 2 0l.43.25a2 2 0 0 1 1 1.73V20a2 2 0 0 0 2 2h.44a2 2 0 0 0 2-2v-.18a2 2 0 0 1 1-1.73l.43-.25a2 2 0 0 1 2 0l.15.08a2 2 0 0 0 2.73-.73l.22-.39a2 2 0 0 0-.73-2.73l-.15-.08a2 2 0 0 1-1-1.74v-.5a2 2 0 0 1 1-1.74l.15-.09a2 2 0 0 0 .73-2.73l-.22-.38a2 2 0 0 0-2.73-.73l-.15.08a2 2 0 0 1-2 0l-.43-.25a2 2 0 0 1-1-1.73V4a2 2 0 0 0-2-2z"/><circle cx="12" cy="12" r="3"/>',
    'logout': '<path d="M9 21H5a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h4"/><polyline points="16 17 21 12 16 7"/><line x1="21" y1="12" x2="9" y2="12"/>',
    'rotate-ccw': '<path d="M3 12a9 9 0 1 0 9-9 9.75 9.75 0 0 0-6.74 2.74L3 8"/><path d="M3 3v5h5"/>',
    'edit': '<path d="M17 3a2.85 2.85 0 0 1 4 4L7.5 20.5 2 22l1.5-5.5z"/><path d="m15 5 4 4"/>',
    'clock': '<circle cx="12" cy="12" r="10"/><polyline points="12 6 12 12 16 14"/>',
    'trash': '<polyline points="3 6 5 6 21 6"/><path d="M19 6v14a2 2 0 0 1-2 2H7a2 2 0 0 1-2-2V6m3 0V4a2 2 0 0 1 2-2h4a2 2 0 0 1 2 2v2"/><line x1="10" y1="11" x2="10" y2="17"/><line x1="14" y1="11" x2="14" y2="17"/>',
    'flame': '<path d="M8.5 14.5A2.5 2.5 0 0 0 11 12c0-1.38-.5-2-1-3-1.072-2.143-.224-4.054 2-6 .5 2.5 2 4.9 4 6.5 2 1.6 3 3.5 3 5.5a7 7 0 1 1-14 0c0-1.153.433-2.294 1-3a2.5 2.5 0 0 0 2.5 2.5z"/>',
    'trending-up': '<polyline points="22 7 13.5 15.5 8.5 10.5 2 17"/><polyline points="16 7 22 7 22 13"/>',
    'search': '<circle cx="11" cy="11" r="8"/><line x1="21" y1="21" x2="16.65" y2="16.65"/>',
    'external-link': '<path d="M18 13v6a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2V8a2 2 0 0 1 2-2h6"/><polyline points="15 3 21 3 21 9"/><line x1="10" y1="14" x2="21" y2="3"/>',
    'coffee': '<path d="M17 8h1a4 4 0 1 1 0 8h-1"/><path d="M3 8h14v9a4 4 0 0 1-4 4H7a4 4 0 0 1-4-4Z"/><line x1="6" y1="2" x2="6" y2="4"/><line x1="10" y1="2" x2="10" y2="4"/><line x1="14" y1="2" x2="14" y2="4"/>',
    'repeat': '<polyline points="17 1 21 5 17 9"/><path d="M3 11V9a4 4 0 0 1 4-4h14"/><polyline points="7 23 3 19 7 15"/><path d="M21 13v2a4 4 0 0 1-4 4H3"/>',
    'home': '<path d="M3 9l9-7 9 7v11a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2z"/><polyline points="9 22 9 12 15 12 15 22"/>',
}

_SVG_TMPL = (
    '<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" '
    'fill="none" stroke="{color}" stroke-width="2" '
    'stroke-linecap="round" stroke-linejoin="round">{paths}</svg>'
)

_cache: dict = {}


def get_icon(name: str, color: str = None, size: int = 18) -> QIcon:
    """이름·색·크기로 틴팅된 QIcon 반환 (캐시됨). 미정의 이름은 빈 QIcon."""
    if color is None:
        color = ThemeColors.get('text_secondary')
    key = (name, color, size)
    cached = _cache.get(key)
    if cached is not None:
        return cached

    paths = _PATHS.get(name)
    if paths is None:
        return QIcon()

    svg = _SVG_TMPL.format(color=color, paths=paths).encode('utf-8')
    renderer = QSvgRenderer(QByteArray(svg))

    dpr = 2  # 2x 렌더 후 devicePixelRatio 지정 → HiDPI에서도 선명
    pm = QPixmap(size * dpr, size * dpr)
    pm.fill(Qt.transparent)
    painter = QPainter(pm)
    renderer.render(painter, QRectF(0, 0, size * dpr, size * dpr))
    painter.end()
    pm.setDevicePixelRatio(dpr)

    icon = QIcon(pm)
    _cache[key] = icon
    return icon


def clear_cache() -> None:
    """테마 전환 등으로 캐시를 비울 때 사용 (보통은 키가 색을 포함하므로 불필요)."""
    _cache.clear()