# -*- coding: utf-8 -*-
u"""在载板中央走廊里找两个中跨 M3 孔的位置（2026-09-05 用户拍板要加）。

判据：孔中心到**任何**已有焊盘 / 电解罐体的净间距 >= CLR。
孔按 NPTH Ø3.2 **无焊盘**算 —— 有焊盘的话 Ø6 塞不进走廊（见输出）。
罐体半径来自 pcb2_place.py 的 C801_BODY_R（Ø12.5 含余量）。
"""
import json
import math
import os
import sys

sys.stdout.reconfigure(encoding='utf-8')
HERE = os.path.dirname(os.path.abspath(__file__))
MIL = 39.3700787401575

pads = json.load(open(os.path.join(HERE, '_pcb2_pads.json'), encoding='utf-8'))


def box(shape, rot, x, y):
    kind = shape[0]
    if kind == 'POLYGON':
        pts = [v for v in shape[1] if isinstance(v, (int, float))]
        xs, ys = pts[0::2], pts[1::2]
        return ((min(xs) + max(xs)) / 2 / MIL, (min(ys) + max(ys)) / 2 / MIL,
                (max(xs) - min(xs)) / 2 / MIL, (max(ys) - min(ys)) / 2 / MIL)
    w, h = float(shape[1]) / MIL, float(shape[2]) / MIL
    d = rot * 180.0 / math.pi if abs(rot) <= 2 * math.pi + 1e-6 else rot
    if round(d) % 180 == 90:
        w, h = h, w
    return x / MIL, y / MIL, w / 2.0, h / 2.0


P = [box(s, r, x, y) for lay, x, y, r, s, net, num in pads]

# 五个 Ø10 电解罐（顶层，按 Ø12.5 留），中心从 pcb2_place.py 的 BAND['c1'] 折算
CANS = [(17.0, 74.5), (88.5, 74.5), (160.0, 74.5), (95.84, 60.66), (167.34, 60.66)]
CAN_R = 6.25

HOLE_R = 1.6          # NPTH Ø3.2
CLR = 0.5             # 到任何铜/罐体的净间距


def clearance(cx, cy):
    best = 1e9
    for px, py, hw, hh in P:
        d = max(abs(cx - px) - hw, abs(cy - py) - hh) - HOLE_R
        best = min(best, d)
    for qx, qy in CANS:
        best = min(best, math.hypot(cx - qx, cy - qy) - CAN_R - HOLE_R)
    return best


# 走廊：两排手机本体之间（CH4/CH5 顶 49.66，CH1~3 底 85.5）
best = []
x = 20.0
while x <= 200.0:
    y = 51.0
    while y <= 84.0:
        c = clearance(x, y)
        if c >= CLR:
            best.append((round(c, 2), round(x, 1), round(y, 1)))
        y += 0.25
    x += 0.25

print(u'走廊里净间距 >= %.1f mm 的候选点 %d 个' % (CLR, len(best)))
# 按 x 分簇，报出每一簇里最宽敞的一个
best.sort(key=lambda t: -t[0])
picked = []
for c, x, y in best:
    if all(math.hypot(x - a[1], y - a[2]) > 12 for a in picked):
        picked.append((c, x, y))
    if len(picked) >= 12:
        break
print(u'%-8s %-8s %-8s' % (u'净间距', 'x', 'y'))
for c, x, y in sorted(picked, key=lambda t: t[1]):
    print(u'%8.2f %8.2f %8.2f' % (c, x, y))