"""
Icons
=====

The app had no icon system. Transport buttons used
`QStyle.standardIcon(SP_MediaPlay)`, which returns the platform style's dark
monochrome glyph -- painted onto the app's saturated red buttons, at a fixed
36px with no text and no tooltip, that reads as a black or empty square. On
styles that return a null icon for some standard pixmaps it *was* an empty
square. Everything else called an "icon" was an emoji baked into the English
translation file, which renders as tofu wherever the emoji font is missing.

Approach: a small set of hand-drawn SVGs rendered through QtSvg (part of
PySide6-Essentials, so no new dependency), recoloured at load. Qt stylesheets
cannot recolour a QIcon, which is the whole reason the old icons were
unreadable -- so the colour is an argument here.

The sources live in this module rather than as asset files on purpose: no
package-data to keep in sync, no path resolution, and nothing to go missing
from a wheel or a frozen build.

Drawing conventions: 24x24 viewBox, 2px round strokes, `%COLOR%` wherever the
colour goes. Shapes that must read as solid at 16px (the play triangle) carry
their own fill.
"""

from functools import lru_cache
from typing import Dict, Optional

from PySide6.QtCore import QByteArray, QRectF, Qt
from PySide6.QtGui import QIcon, QPainter, QPixmap
from PySide6.QtSvg import QSvgRenderer

from ..utils.ytsage_logger import logger

#: Default stroke colour. Overridden per call; kept in step with ytsage_theme.
DEFAULT_COLOR = "#e8eaed"

_SVG: Dict[str, str] = {
    # --- transport -------------------------------------------------------
    "play": '<polygon points="7 4 20 12 7 20" fill="%COLOR%" stroke-linejoin="round"/>',
    "pause": '<rect x="6" y="4" width="4" height="16" rx="1" fill="%COLOR%"/>'
             '<rect x="14" y="4" width="4" height="16" rx="1" fill="%COLOR%"/>',
    "stop": '<rect x="5" y="5" width="14" height="14" rx="2" fill="%COLOR%"/>',
    "skip-back": '<polygon points="19 5 9 12 19 19" fill="%COLOR%" stroke-linejoin="round"/>'
                 '<line x1="6" y1="5" x2="6" y2="19"/>',
    "skip-forward": '<polygon points="5 5 15 12 5 19" fill="%COLOR%" stroke-linejoin="round"/>'
                    '<line x1="18" y1="5" x2="18" y2="19"/>',
    "rewind-10": '<path d="M11 20a8 8 0 1 0-8-8"/><polyline points="3 8 3 12 7 12"/>'
                 '<text x="12" y="16" font-size="8" fill="%COLOR%" stroke="none"'
                 ' text-anchor="middle" font-family="sans-serif">10</text>',
    "forward-10": '<path d="M13 20a8 8 0 1 1 8-8"/><polyline points="21 8 21 12 17 12"/>'
                  '<text x="12" y="16" font-size="8" fill="%COLOR%" stroke="none"'
                  ' text-anchor="middle" font-family="sans-serif">10</text>',
    # --- audio -----------------------------------------------------------
    "volume-high": '<polygon points="11 5 6 9 2 9 2 15 6 15 11 19" fill="%COLOR%" stroke-linejoin="round"/>'
                   '<path d="M15.5 8.5a5 5 0 0 1 0 7"/><path d="M19 5a10 10 0 0 1 0 14"/>',
    "volume-low": '<polygon points="11 5 6 9 2 9 2 15 6 15 11 19" fill="%COLOR%" stroke-linejoin="round"/>'
                  '<path d="M15.5 8.5a5 5 0 0 1 0 7"/>',
    "volume-mute": '<polygon points="11 5 6 9 2 9 2 15 6 15 11 19" fill="%COLOR%" stroke-linejoin="round"/>'
                   '<line x1="16" y1="9" x2="22" y2="15"/><line x1="22" y1="9" x2="16" y2="15"/>',
    "captions": '<rect x="2" y="5" width="20" height="14" rx="3"/>'
                '<path d="M10 10.2a2.6 2.6 0 1 0 0 3.6"/><path d="M17.5 10.2a2.6 2.6 0 1 0 0 3.6"/>',
    # --- window ----------------------------------------------------------
    "maximize": '<path d="M8 3H5a2 2 0 0 0-2 2v3"/><path d="M21 8V5a2 2 0 0 0-2-2h-3"/>'
                '<path d="M3 16v3a2 2 0 0 0 2 2h3"/><path d="M16 21h3a2 2 0 0 0 2-2v-3"/>',
    "minimize": '<path d="M8 3v3a2 2 0 0 1-2 2H3"/><path d="M21 8h-3a2 2 0 0 1-2-2V3"/>'
                '<path d="M3 16h3a2 2 0 0 1 2 2v3"/><path d="M16 21v-3a2 2 0 0 1 2-2h3"/>',
    # --- tabs / navigation -----------------------------------------------
    "rss": '<path d="M4 11a9 9 0 0 1 9 9"/><path d="M4 4a16 16 0 0 1 16 16"/>'
           '<circle cx="5" cy="19" r="1.6" fill="%COLOR%" stroke="none"/>',
    "search": '<circle cx="11" cy="11" r="7"/><line x1="21" y1="21" x2="16.6" y2="16.6"/>',
    "library": '<line x1="4" y1="4" x2="4" y2="20"/><line x1="9" y1="6" x2="9" y2="20"/>'
               '<path d="M14 6.5l4.5 13"/>',
    "download": '<path d="M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4"/>'
                '<polyline points="7 10 12 15 17 10"/><line x1="12" y1="15" x2="12" y2="3"/>',
    "user": '<path d="M19 21v-2a4 4 0 0 0-4-4H9a4 4 0 0 0-4 4v2"/><circle cx="12" cy="7" r="4"/>',
    "user-check": '<path d="M15 21v-2a4 4 0 0 0-4-4H7a4 4 0 0 0-4 4v2"/><circle cx="9" cy="7" r="4"/>'
                  '<polyline points="16 11 18 13 22 9"/>',
    # --- actions ---------------------------------------------------------
    "queue": '<line x1="3" y1="6" x2="16" y2="6"/><line x1="3" y1="12" x2="11" y2="12"/>'
             '<line x1="3" y1="18" x2="11" y2="18"/><line x1="18" y1="9" x2="18" y2="15"/>'
             '<line x1="21" y1="12" x2="15" y2="12"/>',
    "refresh": '<path d="M20.5 12a8.5 8.5 0 1 1-2.5-6"/><polyline points="21 3 21 9 15 9"/>',
    "folder-open": '<path d="M4 20a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h4.2a2 2 0 0 1 1.6.8l1 1.4a2 2 0 0 0 1.6.8H18a2 2 0 0 1 2 2v1"/>'
                   '<path d="M4 20l2.2-7a2 2 0 0 1 1.9-1.4h12a1.6 1.6 0 0 1 1.55 2l-1.7 5.4A2 2 0 0 1 18 20z"/>',
    "x": '<line x1="18" y1="6" x2="6" y2="18"/><line x1="6" y1="6" x2="18" y2="18"/>',
    "check": '<polyline points="20 6 9 17 4 12"/>',
    "plus": '<line x1="12" y1="5" x2="12" y2="19"/><line x1="5" y1="12" x2="19" y2="12"/>',
    "trash": '<polyline points="3 6 21 6"/>'
             '<path d="M19 6v13a2 2 0 0 1-2 2H7a2 2 0 0 1-2-2V6"/>'
             '<path d="M9 6V4a2 2 0 0 1 2-2h2a2 2 0 0 1 2 2v2"/>',
    "settings": '<line x1="4" y1="7" x2="20" y2="7"/><line x1="4" y1="17" x2="20" y2="17"/>'
                '<circle cx="10" cy="7" r="2.4" fill="%COLOR%" stroke="none"/>'
                '<circle cx="15" cy="17" r="2.4" fill="%COLOR%" stroke="none"/>',
    "info": '<circle cx="12" cy="12" r="9"/><line x1="12" y1="11" x2="12" y2="16"/>'
            '<circle cx="12" cy="7.8" r="1.1" fill="%COLOR%" stroke="none"/>',
    "clock": '<circle cx="12" cy="12" r="9"/><polyline points="12 6.8 12 12 15.5 14"/>',
    "scissors": '<circle cx="6" cy="6" r="2.6"/><circle cx="6" cy="18" r="2.6"/>'
                '<line x1="20" y1="4" x2="8.1" y2="15.9"/><line x1="14.5" y1="14.5" x2="20" y2="20"/>'
                '<line x1="8.1" y1="8.1" x2="12" y2="12"/>',
    "external-link": '<path d="M14 3h7v7"/><line x1="10" y1="14" x2="21" y2="3"/>'
                     '<path d="M18 13v6a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2V8a2 2 0 0 1 2-2h6"/>',
    "chevron-down": '<polyline points="6 9 12 15 18 9"/>',
    "chevron-right": '<polyline points="9 6 15 12 9 18"/>',
    "clipboard": '<rect x="8" y="3" width="8" height="4" rx="1"/>'
                 '<path d="M16 5h2a2 2 0 0 1 2 2v12a2 2 0 0 1-2 2H6a2 2 0 0 1-2-2V7a2 2 0 0 1 2-2h2"/>',
    "play-circle": '<circle cx="12" cy="12" r="9"/><polygon points="10 8.5 16 12 10 15.5" fill="%COLOR%" stroke="none"/>',
}

_DOC = (
    '<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" width="24" height="24" '
    'fill="none" stroke="%COLOR%" stroke-width="2" stroke-linecap="round" '
    'stroke-linejoin="round">%BODY%</svg>'
)


def available() -> list:
    """Every icon name this module can draw. Useful when adding call sites."""
    return sorted(_SVG)


def _document(name: str, color: str) -> Optional[bytes]:
    body = _SVG.get(name)
    if body is None:
        return None
    return _DOC.replace("%BODY%", body).replace("%COLOR%", color).encode("utf-8")


@lru_cache(maxsize=512)
def pixmap(name: str, color: str = DEFAULT_COLOR, size: int = 20, dpr: float = 1.0) -> QPixmap:
    """One rendered pixmap. A missing name yields a transparent one, never an error."""
    px = QPixmap(max(1, int(size * dpr)), max(1, int(size * dpr)))
    px.setDevicePixelRatio(dpr)
    px.fill(Qt.GlobalColor.transparent)

    document = _document(name, color)
    if document is None:
        # A typo in a call site should show a gap, not take a dialog down.
        logger.debug(f"Unknown icon name: {name!r}")
        return px

    renderer = QSvgRenderer(QByteArray(document))
    if not renderer.isValid():
        logger.debug(f"Icon {name!r} failed to parse")
        return px

    painter = QPainter(px)
    painter.setRenderHint(QPainter.RenderHint.Antialiasing, True)
    try:
        renderer.render(painter, QRectF(0, 0, size * dpr, size * dpr))
    finally:
        painter.end()
    return px


@lru_cache(maxsize=512)
def icon(name: str, color: str = DEFAULT_COLOR, size: int = 20, disabled_color: str = "#6b7075") -> QIcon:
    """
    A QIcon with its own Normal and Disabled artwork.

    Both 1x and 2x are added so the icon stays sharp on a HiDPI screen without
    Qt upscaling a small bitmap.
    """
    result = QIcon()
    for dpr in (1.0, 2.0):
        result.addPixmap(pixmap(name, color, size, dpr), QIcon.Mode.Normal, QIcon.State.Off)
        result.addPixmap(pixmap(name, disabled_color, size, dpr), QIcon.Mode.Disabled, QIcon.State.Off)
    return result