from __future__ import division
import color as C
import functools
import constants
import random
import math

class Fish(object):
    """Object displayed on the bridge, probably a fish.
    
    Must override color (or color_at), drag, width, height, tailThreshold,
    tailDuration, tailAccelMag
    """

    is_diamond = True

    def __init__(self, x=None, y=None):
        """Create fish with default parameters."""
        if x is not None:
            self.x = x
        elif not hasattr(self, 'x'):
            self.x = 0
        if x is not None:
            self.y = y
        elif not hasattr(self, 'y'):
            self.y = 0.5
        self.speed = C.Vector(0, 0)
        self.tailAcceleration = C.Vector(self.tailAccelMag, 0)
        self.tailThresholdCurrent = self.tailThreshold
        self.tailMoving = False
        self.tailMoveCount = 0
        if not hasattr(self, 'theta_scale'):
            self.theta_scale = 12

    @staticmethod
    def by_type(fish_type):
        if (fish_type == 'jellyfish'):
            return Jellyfish()
        if fish_type == 'dolphin':
            return Dolphin()
        if fish_type == 'boat':
            return Boat()
        if fish_type == 'dory':
            return Dory()
        if fish_type == 'nemo':
            return Nemo()
        if fish_type == 'whale':
            return Whale()
        if fish_type == 'stingray':
            return Stingray()
        if fish_type == 'eel':
            return Eel()
        if fish_type == 'shark':
            return Shark()

    def update(self):
        """Swim gently to the other side of the bridge."""
        if self.x > constants.BRIDGE_WIDTH or self.x < -self.width:
            return False

        self.speed += self.drag * self.speed
        if abs(self.speed) < self.tailThresholdCurrent:
            self.tailMoving = True
            self.tailThresholdCurrent = max(rand_in_range(
                self.tailThreshold - 0.1, self.tailThreshold + 0.1
            ), 0.0001)
            self.fix_direction()
        if self.tailMoveCount > self.tailDuration:
            self.tailMoveCount = 0
            self.tailMoving = False
        if self.tailMoving:
            self.speed += self.tailAcceleration
            self.tailMoveCount += 1
        self.x += self.speed.components[0]
        self.y += self.speed.components[1]

        return True

    def fix_direction(self):
        min_theta = -0.32
        max_theta = 0.32
        if self.y + self.height < 0:
            min_theta = 0
        if self.y > 2:
            max_theta = 0
            
        #theta = rand_in_range(min_theta, max_theta)
        theta = random.gauss(
            (max_theta+min_theta)/2, (max_theta - min_theta)/self.theta_scale
        )
        self.tailAcceleration = C.Vector(self.tailAccelMag, 0).rot2d(theta)

    def color_at(self, x, y):
        """May be overridden to provide multicolored fish."""
        return self.color

    def alpha_at(self, x, y):
        """Return an additional scale amount for clear parts.

        This is overridden to have oddly shaped fish, such as the eel."""
        return 1


class Jellyfish(Fish):
    color = C.HSV(298/360, 89/100, 53/100).to_RGB()
    drag = -0.1
    width = 15
    height = 1.5
    tailThreshold = 0.2
    tailDuration = 6
    tailAccelMag = 0.25


class Dolphin(Fish):
    color = C.HSV(18/360, 0/100, 10/100).to_RGB()
    drag = -0.09
    width = 35
    height = 1.5
    tailThreshold = 0.7
    tailDuration = 2
    tailAccelMag = 0.4
    gravity = C.Vector(0, -0.01)

    direction_fixed = False
    def update(self):
        """Swim gently to the other side of the bridge."""
        if self.x > constants.BRIDGE_WIDTH or self.x < -self.width:
            return False

        if not self.direction_fixed:
            self.tailAcceleration = self.tailAcceleration.rot2d(math.pi / 32)
            self.direction_fixed = True

        self.speed += self.drag * self.speed + self.gravity
        if self.y <= 0.25:
            self.tailMoving = True
        if self.tailMoveCount > self.tailDuration:
            self.tailMoveCount = 0
            self.tailMoving = False
        if self.tailMoving:
            self.speed += self.tailAcceleration
            self.tailMoveCount += 1
        self.x += self.speed.components[0]
        self.y += self.speed.components[1]

        return True


class Boat(Fish):
    color = C.HSV(24/360, 45/100, 44/100).to_RGB()
    drag = 0
    width = 23
    height = 1
    tailDuration = 1
    tailAccelMag = 0.25
    tailThreshold = tailAccelMag
    y = 1

    def fix_direction(self):
        pass


class Dory(Fish):
    # Need to try this on the bridge
    color = C.HSV(235/360, 100/100, 100/100).to_RGB()
    drag = -0.1
    width = 23
    height = 1.5
    tailThreshold = 0.7
    tailDuration = 2
    tailAccelMag = 0.4


class Nemo(Fish):
    color = C.HSV(40/360, 100/100, 10/100).to_RGB()
    drag = -0.09
    width = 23
    height = 1.5
    tailThreshold = 0.7
    tailDuration = 2
    tailAccelMag = 0.4


class Whale(Fish):
    drag = -0.2
    width = 80
    height = 2
    tailThreshold = 0.7
    tailDuration = 3
    tailAccelMag = 0.4
    theta_scale = 20

    y = 0

    white_x_min = 58
    white_x_width = 6
    white_y_min = 1.45
    white_y_height = 0.5

    def color_at(self, x, y):
        """Mostly copied from compute_coverage.
        
        The point here is to render that white part of the Orca.
        """
        white_x_min = self.white_x_min + self.x
        white_x_max = white_x_min + self.white_x_width
        white_y_min = self.white_y_min + self.y
        white_y_max = white_y_min + self.white_y_height
        min_x = min(max(x, white_x_min), x + 1)
        max_x = max(min(x + 1, white_x_max), x)
        min_y = min(max(y, white_y_min), y + 1)
        max_y = max(min(y + 1, white_y_max), y)
        coverage = (max_x - min_x) * (max_y - min_y)
        return C.white * coverage


class Stingray(Fish):
    color = C.HSV(0/360, 0/100, 10/100).to_RGB()
    drag = -0.09
    width = 15
    height = 2
    tailThreshold = 0.7
    tailDuration = 2
    tailAccelMag = 0.2


class Eel(Fish):
    color = C.HSV(109/360, 83/100, 0/100).to_RGB()
    drag = -0.09
    width = 30
    height = 2
    tailThreshold = 0.7
    tailDuration = 2
    tailAccelMag = 0.2

    front_offset = 0
    y = 0
    is_diamond = False

    def alpha_at(self, x, y):
        rel_x = x - self.x
        eel_height = math.sin(
                2 * math.pi * (rel_x + self.front_offset) / self.width
            ) / 2 + 0.5
        y_blend = abs(y - eel_height)
        if y_blend > 0.75:
            return 0
        if y_blend < 0.25:
            return 1
        return 1 - y_blend

    def update(self):
        self.front_offset += abs(self.speed)
        if self.front_offset > self.width:
            self.front_offset = 0
        return super(Eel, self).update()

    def fix_direction(self):
        pass


class Shark(Fish):
    color = C.HSV(0/360, 0/100, 10/100).to_RGB()
    drag = -0.2
    width = 50
    height = 2
    tailThreshold = 0.7
    tailDuration = 3
    tailAccelMag = 0.4
    theta_scale = 20


def rand_in_range(low, high):
    return random.random() * (high - low) + low