#!/usr/bin/env python3
"""Generate the launcher icon VectorDrawable files and a local SVG preview.

This keeps the icon tweakable without hand-editing dense Android vector XML.
Edit the constants below, run this script, then open build/launcher-icon-preview.svg.
"""

from __future__ import annotations

from dataclasses import dataclass
from pathlib import Path
from xml.sax.saxutils import escape

ROOT = Path(__file__).resolve().parents[1]

FOREGROUND = ROOT / "app/src/main/res/drawable/ic_launcher_foreground.xml"
MONOCHROME = ROOT / "app/src/main/res/drawable/ic_launcher_monochrome.xml"
BACKGROUND = ROOT / "app/src/main/res/drawable/ic_launcher_background.xml"
PREVIEW = ROOT / "build/launcher-icon-preview.svg"

VIEWPORT = 108

# Main geometry knobs. Coordinates are in Android/SVG viewport units.
# Open build/launcher-icon-preview.svg after regenerating to compare the
# square, rounded, and circular launcher masks.
# Statusbar panel. It fills the full top width.
STATUS_BOTTOM = 54

CUTOUT_CX = 54
CUTOUT_TOP = 0
CUTOUT_BOTTOM = 39
CUTOUT_STEM_HALF_WIDTH = 2.2

# Android adaptive icons use a 108x108 viewport, but only the central 72x72
# area is guaranteed to survive launcher masks. The preview uses this safe-zone
# circle, not the full viewport circle.
ADAPTIVE_SAFE_RADIUS = 36

# Row 1.
ENVELOPE_X = 39
ENVELOPE_Y = 22.5
ENVELOPE_W = 11
ENVELOPE_H = 8
ENVELOPE_STROKE = 1.3

BATTERY_ICON_X = 58
BATTERY_ICON_Y = 23
BATTERY_ICON_W = 13
BATTERY_ICON_H = 7.7
BATTERY_ICON_RADIUS = 1
BATTERY_ICON_PROTRUSION_W = 2
BATTERY_ICON_PROTRUSION_H = 3
BATTERY_ICON_LEVEL = 0.70
BATTERY_ICON_STROKE = 1.0

# Row 2.
DAY_TEXT_X = 31
DAY_TEXT_Y = 31.6
DAY_TEXT_H = 8
DAY_TEXT_STROKE = 1.1
DAY_TEXT_LETTER_SPACING = 2.0
DAY_TEXT_LOWERCASE_SCALE = 0.82

WIFI_X = 61
WIFI_Y = 36.5
WIFI_W = 10
WIFI_H = 5
WIFI_STROKE = 1.3
WIFI_DOT_R = 0.9

SIGNAL_X = 73
SIGNAL_BOTTOM = 42.5
SIGNAL_BAR_W = 1.8
SIGNAL_BAR_SPACING = 1.2
SIGNAL_BAR_HEIGHTS = (2.8, 5.6, 8.4)

# The divider between the statusbar illustration and the SBT wordmark.
BATTERY_BAR_LEFT = 0
BATTERY_BAR_RIGHT = 108
BATTERY_BAR_Y = STATUS_BOTTOM + 0.0
BATTERY_BAR_H = 6
BATTERY_BAR_LEVEL = 0.70

WORDMARK_X = 35
WORDMARK_Y = 62.8
WORDMARK_W = 50
WORDMARK_H = 20
WORDMARK_STROKE_OUTER = 5.0
WORDMARK_STROKE_INNER = 1.8

COLOR_STATUS = "#77746E"
COLOR_CUTOUT = "#050403"
COLOR_WHITE = "#FFFFFFFF"
COLOR_WARM_WHITE = "#FFF5DC"
COLOR_ORANGE = "#FF9F1A"
COLOR_GREEN = "#2FDB72"
COLOR_BAR_TRACK = "#2A2116"
COLOR_BG = "#0D0B08"


@dataclass(frozen=True)
class PathStyle:
    fill: str = "#00000000"
    stroke: str | None = None
    stroke_width: float | None = None
    line_cap: str | None = None
    line_join: str | None = None


@dataclass(frozen=True)
class IconPath:
    data: str
    style: PathStyle
    comment: str | None = None


def round_rect(x: float, y: float, w: float, h: float, r: float) -> str:
    if r <= 0:
        return rect(x, y, w, h)
    r = min(r, w / 2, h / 2)
    return (
        f"M{x + r:g},{y:g} L{x + w - r:g},{y:g} "
        f"A{r:g},{r:g} 0,0 1 {x + w:g},{y + r:g} "
        f"L{x + w:g},{y + h - r:g} "
        f"A{r:g},{r:g} 0,0 1 {x + w - r:g},{y + h:g} "
        f"L{x + r:g},{y + h:g} "
        f"A{r:g},{r:g} 0,0 1 {x:g},{y + h - r:g} "
        f"L{x:g},{y + r:g} "
        f"A{r:g},{r:g} 0,0 1 {x + r:g},{y:g} Z"
    )


def rect(x: float, y: float, w: float, h: float) -> str:
    return f"M{x:g},{y:g} L{x + w:g},{y:g} L{x + w:g},{y + h:g} L{x:g},{y + h:g} Z"


def circle(cx: float, cy: float, r: float) -> str:
    return (
        f"M{cx - r:g},{cy:g} "
        f"A{r:g},{r:g} 0,1 0 {cx + r:g},{cy:g} "
        f"A{r:g},{r:g} 0,1 0 {cx - r:g},{cy:g}"
    )


def path(data: str, fill: str = "#00000000", *, stroke: str | None = None,
         stroke_width: float | None = None, line_cap: str | None = None,
         line_join: str | None = None, comment: str | None = None) -> IconPath:
    return IconPath(data, PathStyle(fill, stroke, stroke_width, line_cap, line_join), comment)


def stroke_path(data: str, color: str, width: float, *, comment: str | None = None) -> IconPath:
    return path(
        data,
        stroke=color,
        stroke_width=width,
        line_cap="round",
        line_join="round",
        comment=comment,
    )


def seven_segment_digit(x: float, y: float, digit: str, scale: float) -> str:
    segments = {
        "0": "abcfed",
        "1": "bc",
        "2": "abged",
        "3": "abgcd",
        "4": "fgbc",
        "5": "afgcd",
        "6": "afgecd",
        "7": "abc",
        "8": "abcdefg",
        "9": "abfgcd",
    }[digit]
    w = 5 * scale
    h = 10 * scale
    mid = y + h / 2
    left = x
    right = x + w
    top = y
    bottom = y + h
    coords = {
        "a": f"M{left:g},{top:g} L{right:g},{top:g}",
        "b": f"M{right:g},{top:g} L{right:g},{mid:g}",
        "c": f"M{right:g},{mid:g} L{right:g},{bottom:g}",
        "d": f"M{left:g},{bottom:g} L{right:g},{bottom:g}",
        "e": f"M{left:g},{mid:g} L{left:g},{bottom:g}",
        "f": f"M{left:g},{top:g} L{left:g},{mid:g}",
        "g": f"M{left:g},{mid:g} L{right:g},{mid:g}",
    }
    return " ".join(coords[s] for s in segments)


def colon(x: float, y: float, scale: float) -> str:
    r = 1.1 * scale
    return circle(x, y + 3 * scale, r) + " " + circle(x, y + 7 * scale, r)


def cutout_path() -> str:
    cx = CUTOUT_CX
    top = CUTOUT_TOP
    bottom = CUTOUT_BOTTOM
    stem_half = CUTOUT_STEM_HALF_WIDTH
    return (
        f"M{cx - stem_half:g},{top:g} "
        f"L{cx + stem_half:g},{top:g} "
        f"L{cx + stem_half:g},{bottom - stem_half:g} "
        f"C{cx + stem_half:g},{bottom:g} {cx - stem_half:g},{bottom:g} {cx - stem_half:g},{bottom - stem_half:g} "
        f"Z"
    )


def envelope_path() -> str:
    x = ENVELOPE_X
    y = ENVELOPE_Y
    w = ENVELOPE_W
    h = ENVELOPE_H
    return (
        f"M{x:g},{y:g} L{x + w:g},{y:g} L{x + w:g},{y + h:g} L{x:g},{y + h:g} Z "
        f"M{x:g},{y:g} L{x + w / 2:g},{y + h * 0.64:g} L{x + w:g},{y:g}"
    )


def battery_icon_paths(fill: str, stroke: str) -> list[IconPath]:
    x = BATTERY_ICON_X
    y = BATTERY_ICON_Y
    w = BATTERY_ICON_W
    h = BATTERY_ICON_H
    r = BATTERY_ICON_RADIUS
    protrusion_w = BATTERY_ICON_PROTRUSION_W
    protrusion_h = BATTERY_ICON_PROTRUSION_H
    gauge_pad = max(1.0, BATTERY_ICON_STROKE + 0.4)
    gauge_w = max(0.0, (w - gauge_pad * 2) * BATTERY_ICON_LEVEL)
    protrusion_y = y + (h - protrusion_h) / 2
    return [
        stroke_path(
            round_rect(x, y, w, h, r)
            + " "
            + rect(x + w, protrusion_y, protrusion_w, protrusion_h),
            stroke,
            BATTERY_ICON_STROKE,
            comment="Battery outline",
        ),
        path(rect(x + gauge_pad, y + gauge_pad, gauge_w, max(0.0, h - gauge_pad * 2)), fill,
             comment="Battery fill"),
    ]


def day_text_path() -> str:
    x = DAY_TEXT_X
    y = DAY_TEXT_Y
    h = DAY_TEXT_H
    lower_h = h * DAY_TEXT_LOWERCASE_SCALE
    lower_top = y + h - lower_h
    spacing = DAY_TEXT_LETTER_SPACING

    m_w = h * 0.62
    o_w = lower_h * 0.58
    n_w = lower_h * 0.58
    o_x = x + m_w + spacing
    n_x = o_x + o_w + spacing
    return (
        # M
        f"M{x:g},{y + h:g} L{x:g},{y:g} L{x + m_w / 2:g},{y + h * 0.58:g} "
        f"L{x + m_w:g},{y:g} L{x + m_w:g},{y + h:g} "
        # o
        f"M{o_x:g},{lower_top + lower_h / 2:g} "
        f"A{o_w / 2:g},{lower_h / 2:g} 0,1 0 {o_x + o_w:g},{lower_top + lower_h / 2:g} "
        f"A{o_w / 2:g},{lower_h / 2:g} 0,1 0 {o_x:g},{lower_top + lower_h / 2:g} "
        # n
        f"M{n_x:g},{y + h:g} L{n_x:g},{lower_top:g} "
        f"C{n_x + n_w * 0.55:g},{lower_top:g} {n_x + n_w:g},{lower_top + lower_h * 0.2:g} "
        f"{n_x + n_w:g},{y + h:g}"
    )


def wifi_paths(color: str) -> list[IconPath]:
    x = WIFI_X
    y = WIFI_Y
    w = WIFI_W
    h = WIFI_H
    return [
        stroke_path(
            f"M{x:g},{y:g} C{x + w * 0.28:g},{y - h * 0.75:g} "
            f"{x + w * 0.72:g},{y - h * 0.75:g} {x + w:g},{y:g} "
            f"M{x + w * 0.22:g},{y + h * 0.5:g} C{x + w * 0.4:g},{y + h * 0.1:g} "
            f"{x + w * 0.6:g},{y + h * 0.1:g} {x + w * 0.78:g},{y + h * 0.5:g}",
            color,
            WIFI_STROKE,
            comment="Wi-Fi",
        ),
        path(circle(x + w / 2, y + h, WIFI_DOT_R), color, comment="Wi-Fi dot"),
    ]


def signal_path() -> str:
    pieces = []
    for index, height in enumerate(SIGNAL_BAR_HEIGHTS):
        x = SIGNAL_X + index * (SIGNAL_BAR_W + SIGNAL_BAR_SPACING)
        pieces.append(rect(x, SIGNAL_BOTTOM - height, SIGNAL_BAR_W, height))
    return " ".join(pieces)


def clock_paths() -> list[IconPath]:
    y = 42.5
    x = 25
    s = 1.0
    small = 0.72
    pieces = [
        seven_segment_digit(x, y, "1", s),
        seven_segment_digit(x + 8, y, "2", s),
        seven_segment_digit(x + 20, y, "3", s),
        seven_segment_digit(x + 28, y, "4", s),
    ]
    small_x = x + 40
    pieces.extend([
        seven_segment_digit(small_x, y + 2.6, "5", small),
        seven_segment_digit(small_x + 6, y + 2.6, "6", small),
    ])
    return [
        stroke_path(" ".join(pieces), COLOR_WHITE, 1.55, comment="Clock 12:34"),
        path(colon(x + 16.5, y, s) + " " + colon(small_x - 3.5, y + 2.6, small), COLOR_WHITE,
             comment="Clock colons"),
    ]


def statusbar_paths(monochrome: bool) -> list[IconPath]:
    white = COLOR_WHITE
    status_fill = COLOR_WHITE if monochrome else COLOR_STATUS
    cutout_fill = COLOR_WHITE if monochrome else COLOR_CUTOUT
    paths: list[IconPath] = []
    paths.append(path(rect(0, 0, VIEWPORT, STATUS_BOTTOM), status_fill, comment="Statusbar panel"))
    paths.append(path(cutout_path(), cutout_fill, comment="Camera cutout"))

    # Row 1.
    paths.append(stroke_path(envelope_path(), white, ENVELOPE_STROKE, comment="Envelope"))
    paths.extend(battery_icon_paths(white, white))

    # Row 2.
    paths.append(stroke_path(day_text_path(), white, DAY_TEXT_STROKE, comment="Mon"))
    paths.extend(wifi_paths(white))
    paths.append(path(signal_path(), white, comment="Cellular bars"))

    # Row 3.
    paths.extend(clock_paths())
    return paths


def battery_bar_paths(monochrome: bool) -> list[IconPath]:
    green = COLOR_WHITE if monochrome else COLOR_GREEN
    track = COLOR_WHITE if monochrome else COLOR_BAR_TRACK
    track_w = max(0.0, BATTERY_BAR_RIGHT - BATTERY_BAR_LEFT)
    fill_w = track_w * BATTERY_BAR_LEVEL
    return [
        path(round_rect(BATTERY_BAR_LEFT, BATTERY_BAR_Y, track_w, BATTERY_BAR_H, 3), track,
             comment="Battery bar track"),
        path(round_rect(BATTERY_BAR_LEFT + 1, BATTERY_BAR_Y + 1, max(0.0, fill_w - 2), BATTERY_BAR_H - 2, 2), green,
             comment="Battery bar fill"),
    ]


def wordmark_paths(monochrome: bool) -> list[IconPath]:
    x = WORDMARK_X
    y = WORDMARK_Y
    w = WORDMARK_W
    h = WORDMARK_H
    gap = w * 0.075
    s_w = w * 0.22
    b_w = w * 0.24
    t_w = w * 0.26
    s_x = x
    b_x = s_x + s_w + gap
    t_x = b_x + b_w + gap
    mid = y + h * 0.50
    cut = min(b_w * 0.28, h * 0.18)
    data = (
        f"M{s_x + s_w:g},{y:g} L{s_x:g},{y:g} L{s_x:g},{mid:g} L{s_x + s_w:g},{mid:g} "
        f"L{s_x + s_w:g},{y + h:g} L{s_x:g},{y + h:g} "
        f"M{b_x:g},{y:g} L{b_x:g},{y + h:g} "
        f"M{b_x:g},{y:g} L{b_x + b_w - cut:g},{y:g} L{b_x + b_w:g},{y + cut:g} "
        f"L{b_x + b_w:g},{mid - cut:g} L{b_x + b_w - cut:g},{mid:g} L{b_x:g},{mid:g} "
        f"M{b_x:g},{mid:g} L{b_x + b_w - cut:g},{mid:g} L{b_x + b_w:g},{mid + cut:g} "
        f"L{b_x + b_w:g},{y + h - cut:g} L{b_x + b_w - cut:g},{y + h:g} L{b_x:g},{y + h:g} "
        f"M{t_x:g},{y:g} L{t_x + t_w:g},{y:g} M{t_x + t_w / 2:g},{y:g} L{t_x + t_w / 2:g},{y + h:g}"
    )
    if monochrome:
        return [stroke_path(data, COLOR_WHITE, WORDMARK_STROKE_OUTER, comment="SBT wordmark")]
    return [
        stroke_path(data, COLOR_ORANGE, WORDMARK_STROKE_OUTER, comment="SBT wordmark outer"),
        stroke_path(data, COLOR_WARM_WHITE, WORDMARK_STROKE_INNER, comment="SBT wordmark inner"),
    ]


def foreground_paths(monochrome: bool = False) -> list[IconPath]:
    return statusbar_paths(monochrome) + battery_bar_paths(monochrome) + wordmark_paths(monochrome)


def background_paths() -> list[IconPath]:
    return [
        path(rect(0, 0, VIEWPORT, VIEWPORT), COLOR_BG),
    ]


def android_path_xml(icon_path: IconPath) -> str:
    attrs = [
        f'android:fillColor="{icon_path.style.fill}"',
        f'android:pathData="{escape(icon_path.data)}"',
    ]
    if icon_path.style.stroke:
        attrs.append(f'android:strokeColor="{icon_path.style.stroke}"')
    if icon_path.style.stroke_width is not None:
        attrs.append(f'android:strokeWidth="{icon_path.style.stroke_width:g}"')
    if icon_path.style.line_cap:
        attrs.append(f'android:strokeLineCap="{icon_path.style.line_cap}"')
    if icon_path.style.line_join:
        attrs.append(f'android:strokeLineJoin="{icon_path.style.line_join}"')
    return "    <path\n        " + "\n        ".join(attrs) + " />"


def write_vector(destination: Path, paths: list[IconPath]) -> None:
    body = "\n".join(
        (f"\n    <!-- {escape(p.comment)} -->\n" if p.comment else "\n") + android_path_xml(p)
        for p in paths
    )
    destination.write_text(
        '<?xml version="1.0" encoding="utf-8"?>\n'
        '<vector xmlns:android="http://schemas.android.com/apk/res/android"\n'
        '    android:width="108dp"\n'
        '    android:height="108dp"\n'
        '    android:viewportWidth="108"\n'
        '    android:viewportHeight="108">'
        f'{body}\n'
        '</vector>\n',
        encoding="utf-8",
    )


def svg_path_xml(icon_path: IconPath) -> str:
    style = [f'fill="{icon_path.style.fill}"']
    if icon_path.style.stroke:
        style.append(f'stroke="{icon_path.style.stroke}"')
    if icon_path.style.stroke_width is not None:
        style.append(f'stroke-width="{icon_path.style.stroke_width:g}"')
    if icon_path.style.line_cap:
        style.append(f'stroke-linecap="{icon_path.style.line_cap}"')
    if icon_path.style.line_join:
        style.append(f'stroke-linejoin="{icon_path.style.line_join}"')
    return f'<path d="{escape(icon_path.data)}" {" ".join(style)} />'


def write_preview() -> None:
    PREVIEW.parent.mkdir(parents=True, exist_ok=True)
    paths = background_paths() + foreground_paths(False)
    body = "\n  ".join(svg_path_xml(p) for p in paths)
    panel_bg = '<rect width="108" height="108" fill="#050403" />'
    square = f'<g transform="translate(0,0)">\n  {panel_bg}\n  {body}\n</g>'
    rounded = (
        '<g clip-path="url(#rounded-mask)">\n'
        '  <g transform="translate(126,0)">\n'
        f'    {panel_bg}\n    {body}\n'
        '  </g>\n'
        '</g>\n'
        '<rect x="126" y="0" width="108" height="108" rx="27" fill="none" '
        'stroke="#66FFFFFF" stroke-width="0.8" />'
    )
    circle_preview = (
        '<g clip-path="url(#circle-mask)">\n'
        '  <g transform="translate(252,0)">\n'
        f'    {panel_bg}\n    {body}\n'
        '  </g>\n'
        '</g>\n'
        f'<circle cx="306" cy="54" r="{ADAPTIVE_SAFE_RADIUS}" fill="none" '
        'stroke="#66FFFFFF" stroke-width="0.8" />'
    )
    PREVIEW.write_text(
        '<svg xmlns="http://www.w3.org/2000/svg" width="1368" height="432" viewBox="0 0 360 114">\n'
        '  <defs>\n'
        '    <clipPath id="rounded-mask"><rect x="126" y="0" width="108" height="108" rx="27" /></clipPath>\n'
        f'    <clipPath id="circle-mask"><circle cx="306" cy="54" r="{ADAPTIVE_SAFE_RADIUS}" /></clipPath>\n'
        '  </defs>\n'
        '  <rect width="360" height="114" fill="#18130C" />\n'
        f'  {square}\n'
        f'  {rounded}\n'
        f'  {circle_preview}\n'
        '  <text x="54" y="113" fill="#DDD4C2" font-size="4" text-anchor="middle">square</text>\n'
        '  <text x="180" y="113" fill="#DDD4C2" font-size="4" text-anchor="middle">rounded</text>\n'
        '  <text x="306" y="113" fill="#DDD4C2" font-size="4" text-anchor="middle">circle</text>\n'
        '</svg>\n',
        encoding="utf-8",
    )


def main() -> None:
    write_vector(BACKGROUND, background_paths())
    write_vector(FOREGROUND, foreground_paths(False))
    write_vector(MONOCHROME, foreground_paths(True))
    write_preview()
    print(f"Wrote {FOREGROUND.relative_to(ROOT)}")
    print(f"Wrote {MONOCHROME.relative_to(ROOT)}")
    print(f"Wrote {BACKGROUND.relative_to(ROOT)}")
    print(f"Wrote {PREVIEW.relative_to(ROOT)}")


if __name__ == "__main__":
    main()