import sys
import re
import math
from copy import copy, deepcopy
import warnings

from .primitives import *
from ..graphic_objects import Region
from ..apertures import RectangleAperture, CircleAperture


class ProtoBoard(Board):
    def __init__(self, w, h, content, margin=None, corner_radius=None, mounting_hole_dia=None, mounting_hole_offset=None, unit=MM):
        corner_radius = corner_radius or unit(1.5, MM)
        super().__init__(w, h, corner_radius, unit=unit)
        self.margin = margin or unit(2, MM)
        self.content = content

        if mounting_hole_dia:
            mounting_hole_offset = mounting_hole_offset or mounting_hole_dia*2
            ko = mounting_hole_offset*2

            self.add(Hole(mounting_hole_offset, mounting_hole_offset, mounting_hole_dia, unit=unit))
            self.add(Hole(w-mounting_hole_offset, mounting_hole_offset, mounting_hole_dia, unit=unit))
            self.add(Hole(mounting_hole_offset, h-mounting_hole_offset, mounting_hole_dia, unit=unit))
            self.add(Hole(w-mounting_hole_offset, h-mounting_hole_offset, mounting_hole_dia, unit=unit))

            self.keepouts.append(((0, 0), (ko, ko)))
            self.keepouts.append(((w-ko, 0), (w, ko)))
            self.keepouts.append(((0, h-ko), (ko, h)))
            self.keepouts.append(((w-ko, h-ko), (w, h)))

        self.generate()

    def generate(self, unit=MM):
        bbox = ((self.margin, self.margin), (self.w-self.margin, self.h-self.margin))
        bbox = unit.convert_bounds_from(self.unit, bbox)
        for obj in self.content.generate(bbox, unit):
            self.add(obj, keepout_errors='skip')


class PropLayout:
    def __init__(self, content, direction, proportions):
        self.content = list(content)
        if direction not in ('h', 'v'):
            raise ValueError('direction must be one of "h", or "v".')
        self.direction = direction
        self.proportions = list(proportions)
        if len(content) != len(proportions):
            raise ValueError('proportions and content must have same length')

    def generate(self, bbox, unit=MM):
        for bbox, child in self.layout_2d(bbox, unit):
            yield from child.generate(bbox, unit)

    def fit_size(self, w, h, unit=MM):
        widths = []
        heights = []
        for ((x_min, y_min), (x_max, y_max)), child in self.layout_2d(((0, 0), (w, h)), unit):
            if not isinstance(child, EmptyProtoArea):
                widths.append(x_max - x_min)
                heights.append(y_max - y_min)
        if self.direction == 'h':
            return sum(widths), max(heights)
        else:
            return max(widths), sum(heights)

    def layout_2d(self, bbox, unit=MM):
        (x, y), (w, h) = bbox
        w, h = w-x, h-y

        actual_l = 0
        target_l = 0

        for l, child in zip(self.layout(w if self.direction == 'h' else h, unit), self.content):
            this_x, this_y = x, y
            this_w, this_h = w, h
            target_l += l

            if self.direction == 'h':
                this_w = target_l - actual_l
            else:
                this_h = target_l - actual_l

            this_w, this_h = child.fit_size(this_w, this_h, unit)

            if self.direction == 'h':
                x += this_w
                actual_l += this_w
                this_h = h
            else:
                y += this_h
                actual_l += this_h
                this_w = w

            yield ((this_x, this_y), (this_x+this_w, this_y+this_h)), child

    def layout(self, length, unit=MM):
        out = [ eval_value(value, MM(length, unit)) for value in self.proportions ]
        total_length = sum(value for value in out if value is not None)
        if length - total_length < -1e-6:
            raise ValueError(f'Proportions sum to {total_length} mm, which is greater than the available space of {length} mm.')

        leftover = length - total_length
        sum_props = sum( (value or 1.0) for value in self.proportions if not isinstance(value, str) )
        return [ unit(leftover * (value or 1.0) / sum_props if not isinstance(value, str) else calculated, MM)
                for value, calculated in zip(self.proportions, out) ]

    def __str__(self):
        children = ', '.join( f'{elem}:{width}' for elem, width in zip(self.content, self.proportions))
        return f'PropLayout[{self.direction.upper()}]({children})'


class TwoSideLayout:
    def __init__(self, top, bottom):
        self.top, self.bottom = top, bottom

        if not top.single_sided or not bottom.single_sided:
            warnings.warn('Two-sided pattern used on one side of a TwoSideLayout')

    def fit_size(self, w, h, unit=MM):
        w1, h1 = self.top.fit_size(w, h, unit)
        w2, h2 = self.bottom.fit_size(w, h, unit)
        if isinstance(self.top, EmptyProtoArea):
            if isinstance(self.bottom, EmptyProtoArea):
                return w1, h1
            return w2, h2
        if isinstance(self.bottom, EmptyProtoArea):
            return w1, h1
        return max(w1, w2), max(h1, h2)

    def generate(self, bbox, unit=MM):
        yield from self.top.generate(bbox, unit)
        for obj in self.bottom.generate(bbox, unit):
            obj.side = 'bottom'
            yield obj


class PatternProtoArea:
    def __init__(self, pitch_x, pitch_y=None, obj=None, unit=MM):
        self.pitch_x = pitch_x
        self.pitch_y = pitch_y or pitch_x
        self.obj = obj
        self.unit = unit

    def fit_size(self, w, h, unit=MM):
        (min_x, min_y), (max_x, max_y) = self.fit_rect(((0, 0), (w, h)))
        return max_x-min_x, max_y-min_y

    def fit_rect(self, bbox, unit=MM):
        (x, y), (w, h) = bbox
        w, h = w-x, h-y

        w_mod = round((w + 5e-7) % unit(self.pitch_x, self.unit), 6)
        h_mod = round((h + 5e-7) % unit(self.pitch_y, self.unit), 6)
        w_fit, h_fit = round(w - w_mod, 6), round(h - h_mod, 6)

        x = x + (w-w_fit)/2
        y = y + (h-h_fit)/2
        return (x, y), (x+w_fit, y+h_fit)

    def generate(self, bbox, unit=MM):
        (x, y), (w, h) = bbox
        w, h = w-x, h-y
        n_x = int(w//unit(self.pitch_x, self.unit))
        n_y = int(h//unit(self.pitch_y, self.unit))
        off_x = (w % unit(self.pitch_x, self.unit)) / 2
        off_y = (h % unit(self.pitch_y, self.unit)) / 2

        for i in range(n_x):
            for j in range(n_y):
                if hasattr(self.obj, 'inst'):
                    inst = self.obj.inst(i, j)
                else:
                    inst = copy(self.obj)

                inst.x = inst.unit(off_x + x, unit) + (i + 0.5) * inst.unit(self.pitch_x, self.unit)
                inst.y = inst.unit(off_y + y, unit) + (j + 0.5) * inst.unit(self.pitch_y, self.unit)
                yield inst

    @property
    def single_sided(self):
        return self.obj.single_sided


class EmptyProtoArea:
    def __init__(self, copper_fill=False):
        self.copper_fill = copper_fill

    def fit_size(self, w, h, unit=MM):
        return w, h

    def generate(self, bbox, unit=MM):
        if self.copper:
            (min_x, min_y), (max_x, max_y) = bbox
            yield ObjectGroup(top_copper=[Region([(min_x, min_y), (max_x, min_y), (max_x, max_y), (min_x, max_y)],
                                                unit=unit, polarity_dark=True)])

    @property
    def single_sided(self):
        return True


class ManhattanPads(ObjectGroup):
    def __init__(self, w, h=None, gap=0.2, unit=MM):
        super().__init__(0, 0)
        h = h or w
        self.gap = gap
        self.unit = unit

        p = (w-2*gap)/2
        q = (h-2*gap)/2
        small_ap = RectangleAperture(p, q, unit=unit)

        s = min(w, h) / 2 / math.sqrt(2)
        large_ap = RectangleAperture(s, s, rotation=math.pi/4, unit=unit)
        large_ap_neg = RectangleAperture(s+2*gap, s+2*gap, rotation=math.pi/4, unit=unit)

        a = gap/2 + p/2
        b = gap/2 + q/2

        self.top_copper.append(Flash(-a, -b, aperture=small_ap, unit=unit))
        self.top_copper.append(Flash(-a,  b, aperture=small_ap, unit=unit))
        self.top_copper.append(Flash( a, -b, aperture=small_ap, unit=unit))
        self.top_copper.append(Flash( a,  b, aperture=small_ap, unit=unit))
        self.top_copper.append(Flash(0, 0, aperture=large_ap_neg, polarity_dark=False, unit=unit))
        self.top_copper.append(Flash(0, 0, aperture=large_ap, unit=unit))
        self.top_mask = self.top_copper


class PoweredProto(ObjectGroup):
    def __init__(self, pitch=None, drill=None, clearance=None, power_pad_dia=None, via_size=None, trace_width=None, unit=MM):
        super().__init__(0, 0)
        self.unit = unit
        self.pitch = pitch = pitch or unit(2.54, MM)
        self.drill = drill = drill or unit(0.9, MM)
        self.clearance = clearance = clearance or unit(0.3, MM)
        self.trace_width = trace_width = trace_width or unit(0.3, MM)
        self.via_size = via_size = via_size or unit(0.4, MM)

        main_pad_dia = pitch - trace_width - 2*clearance
        power_pad_dia_max = math.sqrt(2)*pitch - main_pad_dia - 2*clearance
        if power_pad_dia is None:
            power_pad_dia = power_pad_dia_max - clearance # reduce some more to give the user more room
        elif power_pad_dia > power_pad_dia_max:
            warnings.warn(f'Power pad diameter {power_pad_dia} > {power_pad_dia_max} violates pad-to-pad clearance')
        self.power_pad_dia = power_pad_dia

        main_ap = CircleAperture(main_pad_dia, unit=unit)
        power_ap = CircleAperture(self.power_pad_dia, unit=unit)

        for l in [self.top_copper, self.bottom_copper]:
            l.append(Flash(0, 0, aperture=main_ap, unit=unit))

            l.append(Flash(-pitch/2, -pitch/2, aperture=power_ap, unit=unit))
            l.append(Flash(-pitch/2,  pitch/2, aperture=power_ap, unit=unit))
            l.append(Flash( pitch/2, -pitch/2, aperture=power_ap, unit=unit))
            l.append(Flash( pitch/2,  pitch/2, aperture=power_ap, unit=unit))

        self.drill_pth.append(Flash(0, 0, ExcellonTool(drill, plated=True, unit=unit), unit=unit))
        self.drill_pth.append(Flash(-pitch/2, -pitch/2, ExcellonTool(via_size, plated=True, unit=unit), unit=unit))

        self.top_mask = copy(self.top_copper)
        self.bottom_mask = copy(self.bottom_copper)

        self.line_ap = CircleAperture(trace_width, unit=unit)
        self.top_copper.append(Line(-pitch/2, -pitch/2, -pitch/2, pitch/2, aperture=self.line_ap, unit=unit))
        self.top_copper.append(Line(pitch/2, -pitch/2, pitch/2, pitch/2, aperture=self.line_ap, unit=unit))
        self.bottom_copper.append(Line(-pitch/2, -pitch/2, pitch/2, -pitch/2, aperture=self.line_ap, unit=unit))
        self.bottom_copper.append(Line(-pitch/2, pitch/2, pitch/2, pitch/2, aperture=self.line_ap, unit=unit))

    def inst(self, x, y):
        inst = copy(self)
        if (x + y) % 2 == 0:
            inst.drill_pth = inst.drill_pth[:-1]

        c = self.power_pad_dia/2 + self.clearance
        p = self.pitch/2

        if x == 1:
            inst.top_silk = [Line(-p, -p+c, -p, p-c, aperture=self.line_ap, unit=self.unit)]
        elif x % 2 == 0:
            inst.top_silk = [Line(p, -p+c, p, p-c, aperture=self.line_ap, unit=self.unit)]

        if y == 0:
            inst.bottom_silk = [Line(-p+c, -p, p-c, -p, aperture=self.line_ap, unit=self.unit)]
        elif y % 2 == 1:
            inst.bottom_silk = [Line(-p+c, p, p-c, p, aperture=self.line_ap, unit=self.unit)]

        return inst

    def bounding_box(self, unit=MM):
        x, y, rotation = self.abs_pos
        p = self.pitch/2
        return unit.convert_bounds_from(self.unit, ((x-p, y-p), (x+p, y+p)))


def convert_to_mm(value, unit):
    unitl  = unit.lower()
    if unitl == 'mm':
        return value
    elif unitl == 'cm':
        return value*10
    elif unitl == 'in':
        return value*25.4
    elif unitl == 'mil':
        return value/1000*25.4
    else:
        raise ValueError(f'Invalid unit {unit}, allowed units are mm, cm, in, and mil.')


_VALUE_RE = re.compile('([0-9]*\.?[0-9]+)(cm|mm|in|mil|%)')
def eval_value(value, total_length=None):
    if not isinstance(value, str):
        return None

    m = _VALUE_RE.match(value.lower())
    number, unit = m.groups()
    if unit == '%':
        if total_length is None:
            raise ValueError('Percentages are not allowed for this value')
        return total_length * float(number) / 100
    return convert_to_mm(float(number), unit)


def _demo():
    #pattern1 = PatternProtoArea(2.54, obj=THTPad.circle(0, 0, 0.9, 1.8, paste=False))
    #pattern2 = PatternProtoArea(1.2, 2.0, obj=SMDPad.rect(0, 0, 1.0, 1.8, paste=False))
    #pattern3 = PatternProtoArea(2.54, 1.27, obj=SMDPad.rect(0, 0, 2.3, 1.0, paste=False))
    #stack = TwoSideLayout(pattern2, pattern3)
    #layout = PropLayout([pattern1, stack], 'h', [0.5, 0.5])
    #pattern = PatternProtoArea(2.54, obj=ManhattanPads(2.54))
    pattern = PatternProtoArea(2.54, obj=PoweredProto())
    pb = ProtoBoard(100, 80, pattern, mounting_hole_dia=3.2, mounting_hole_offset=5)
    print(pb.pretty_svg())
    pb.layer_stack().save_to_directory('/tmp/testdir')


if __name__ == '__main__':
    _demo()