from datetime import datetime, timezone, timedelta
import io
import math

from PIL import Image, ImageDraw, ImageFont

import pygal

from . import display_longtext
from .weather_api import WeatherAPI

def draw_format_infos(infos, width, height, fnt_R, fnt_B, label_margin, align_height=0, margin_bf_first=True, **kwargs):
        image = Image.new('RGBA', (int(width), int(height)))
        draw = ImageDraw.Draw(image)

        nb_infos = len(infos.keys())
        size = 0
        for k,v in infos.items():
            size += fnt_R.getsize(k)[0]
            size += label_margin
            size += fnt_B.getsize(v)[0]

        margin = (width - size) / nb_infos
        align = 0
        if margin_bf_first:
            align += margin / 2
        for k,v in infos.items():
            draw.text(
                (align, align_height),
                k,
                font=fnt_R, **kwargs
            )
            align += fnt_R.getsize(k)[0] + label_margin
            draw.text(
                (align, align_height),
                v,
                font=fnt_B, **kwargs
            )
            align += fnt_B.getsize(v)[0] + margin

        return image

class WeatherToolbarModule:

    def __init__(self):
        self.label_margin = 3

    def draw_module(self, config, width, height):
        image = Image.new('RGB', (width, height), 'black')

        draw = ImageDraw.Draw(image)
        fnt_R = ImageFont.truetype(config.fnt_R_path, 16)
        fnt_B = ImageFont.truetype(config.fnt_RB_path, 20)

        weather = WeatherAPI().get_currently()

        infos = {
            "Vent": "%d km/h" % weather["windSpeed"],
            "Humidité": "%d%%" % (weather["humidity"] * 100),
            "Indice UV": str(weather["uvIndex"]),
            "Pression": "%d hPa" % weather["pressure"],
        }

        txt = draw_format_infos(infos, width, height, fnt_R, fnt_B, self.label_margin, align_height=height/2, anchor="lm")
        image.paste(txt, (0,0), txt)

        return image

class WeatherJumboCurrentModule:

    def __init__(self):
        self.middle_align = 1/3

    def draw_module(self, config, width, height):
        image = Image.new('RGB', (width, height), '#fff')

        draw = ImageDraw.Draw(image)
        fnt_Big = ImageFont.truetype(config.fnt_RB_path, 33)
        fnt_R = ImageFont.truetype(config.fnt_R_path, 16)
        fnt_B = ImageFont.truetype(config.fnt_RB_path, 16)

        # current
        curweather = WeatherAPI().get_currently()

        icon = Image.open("icons/" + WeatherAPI.get_icon(curweather["icon"], current=True)).resize((height, height))
        image.paste(icon, (int(width*self.middle_align - height), 0), icon)

        draw.text(
            (width*self.middle_align, height/3),
            "%d˚ %s." % (math.trunc(curweather["temperature"]), curweather["summary"]),
            fill="black", anchor="ld", font=fnt_Big
        )

        thisdayweather = WeatherAPI().get_daily()["data"][0]

        infos = {
            "Ressentie": "%d˚" % curweather["apparentTemperature"],
            "Minimale": "%d˚" % thisdayweather["temperatureLow"],
            "Maximale": "%d˚" % thisdayweather["temperatureHigh"],
        }

        txt = draw_format_infos(infos, (1-self.middle_align) * width, 20, fnt_R, fnt_B, 5, margin_bf_first=False, fill="black", anchor="lt")
        image.paste(txt, (int(self.middle_align*width),int(height/2.6)), txt)

        # day
        fnt_Rig = ImageFont.truetype(config.fnt_R_path, 20)

        dayweather = WeatherAPI().get_hourly()

        if dayweather["data"][0]["summary"] != dayweather["data"][1]["summary"]:
            display_longtext(draw, (width*self.middle_align, height/1.28), dayweather["data"][1]["summary"] + " la prochaine heure.\n" + dayweather["summary"], fill="black", anchor="lm", font=fnt_Rig, maxwidth=(1-self.middle_align)*width)
        else:
            display_longtext(draw, (width*self.middle_align, height/1.28), dayweather["summary"], fill="black", anchor="lm", font=fnt_Rig, maxwidth=(1-self.middle_align)*width)

        return image

class WeatherMoonPhaseModule:

    def draw_module(self, config, width, height):
        image = Image.new('RGBA', (width, height), '#fff0')

        icon = Image.open("icons/" + WeatherAPI().get_moon_icon()).resize((height, height))
        image.paste(icon, (0,0), icon)

        return image


class WeatherSunModule:

    def draw_module(self, config, width, height, start_align=0):
        image = Image.new('RGB', (width, height), '#fff')
        draw = ImageDraw.Draw(image)
        fnt_R = ImageFont.truetype(config.fnt_R_path, int(height*0.7))

        thisdayweather = WeatherAPI().get_daily()["data"][0]

        import time
        infos = {
            "sunrise": WeatherAPI().read_timestamp(thisdayweather["sunriseTime"]).strftime("%X"),
            "sunset": WeatherAPI().read_timestamp(thisdayweather["sunsetTime"]).strftime("%X"),
        }

        align = start_align
        for icon, info in infos.items():
            if info == "":
                continue
            icon = Image.open("icons/wi-" + icon + ".png").resize((height, height))
            image.paste(icon, (align,0), icon)
            align += height + 2
            draw.text(
                (align, height / 2),
                info,
                fill="black", anchor="lm", font=fnt_R
            )
            align += fnt_R.getsize(info)[0]
            align += 10

        return image


class WeatherRainModule:

    def draw_module(self, config, width, height):
        if datetime.now().hour >= 21:
                thisdayweather = WeatherAPI().get_daily()["data"][1]
        else:
                thisdayweather = WeatherAPI().get_daily()["data"][0]


        gauge = pygal.SolidGauge(config.pygal_config, half_pie=True, inner_radius=0.70, width=width, height=height*1.55, style=config.pygal_custom_style, show_legend=False, margin_top=-height*0.58, margin_left=1, margin_right=1)
        percent_formatter = lambda x: '{:.10g}%'.format(x)
        gauge.value_formatter = percent_formatter

        if thisdayweather["precipProbability"] == 0 and thisdayweather["uvIndex"] > 4:
                gauge.add('Index UV', [{'value': thisdayweather["uvIndex"] * 10}])
                icon_path = "wi-hot.png"
        elif thisdayweather["precipProbability"] > 0:
                gauge.add('Pluie', [{'value': thisdayweather["precipProbability"] * 100 + 1}])
                icon_path = "wi-umbrella.png"
        elif thisdayweather["windSpeed"] > 50:
                gauge.add('Vent', [{'value': thisdayweather["windSpeed"], 'color': '#999'}])
                icon_path = "wi-strong-wind.png"
        elif thisdayweather["visibility"] < 10:
                gauge.add('Visibilité', [{'value': thisdayweather["visibility"] * 10, 'color': '#999'}])
                icon_path = "wi-fog.png"
        elif thisdayweather["cloudCover"] > 0.4:
                gauge.add('Couverture nuageuse', [{'value': thisdayweather["cloudCover"] * 100, 'color': '#999'}])
                icon_path = "wi-cloudy.png"
        else:
                gauge.add('Pluie', [{'value': thisdayweather["precipProbability"] * 100}])
                icon_path = "wi-na.png"

        image = Image.open(io.BytesIO(gauge.render_to_png()))

        if icon_path:
                icon = Image.open("icons/" + icon_path).resize((int(height/1.25), int(height/1.25)))
                image.paste(icon, (int(width/2-height/2.5), int(height-height/1.25)), icon)

        return image

class WeatherTemperatureModule:

    def __init__(self):
        self.limit_futur = 30

    def draw_module(self, config, width, height):
        thisdayweather = WeatherAPI().get_daily()["data"]
        if datetime.now().hour >= 19 and thisdayweather[1]["precipProbability"] > thisdayweather[0]["precipProbability"]:
                thisdayweather = thisdayweather[1]
        else:
                thisdayweather = thisdayweather[0]

        hours_weather = WeatherAPI().get_hourly()

        hourly_min = 0
        hourly_max = 0
        for h in hours_weather["data"]:
            if hourly_min > h["temperature"]:
                hourly_min = h["temperature"]
            if hourly_max < h["temperature"]:
                hourly_max = h["temperature"]

        line_chart = pygal.Line(config.pygal_config, interpolate='cubic', width=width+10, height=height, inverse_y_axis=False, x_label_rotation=45, range=(hourly_min, hourly_max), secondary_range=(0,100) if thisdayweather["precipProbability"] > 0 else (0,10), **config.charts_opts)
        line_chart.value_formatter = lambda x: "%d" % x

        line_chart.x_labels = [WeatherAPI().read_timestamp(d["time"]).strftime("%Hh") if datetime.fromtimestamp(d["time"]).hour % 2 == 0 else "" for d in hours_weather["data"][:self.limit_futur]]

        line_chart.add('Températures', [d["temperature"] for d in hours_weather["data"][:self.limit_futur]], show_dots=False)

        if thisdayweather["precipProbability"] > 0:
            line_chart.add('Précipitations', [d["precipProbability"] * 100 for d in hours_weather["data"][:self.limit_futur]], secondary=True, show_dots=False, fill=True if hourly_min == 0 else False)
        else:
            line_chart.add('Index UV', [d["uvIndex"] for d in hours_weather["data"][:self.limit_futur]], secondary=True, show_dots=False)

        return Image.open(io.BytesIO(line_chart.render_to_png()))

class WeeklyWeatherModule:

    def __init__(self):
        self.first_day = 1
        self.limit_futur = 7

    def draw_module(self, config, width, height):
        image = Image.new('RGB', (width, height), 'white')
        draw = ImageDraw.Draw(image)
        fnt_R = ImageFont.truetype(config.fnt_R_path, 14)
        fnt_B = ImageFont.truetype(config.fnt_RB_path, 14)

        weekweather = WeatherAPI().get_daily()
        daysweather = weekweather["data"]

        nbdays = len(daysweather[self.first_day:self.first_day+self.limit_futur])
        day_size = int(height / (nbdays + 1))

        display_longtext(draw,
                (day_size + (width - day_size)/2, day_size / 2 + 5),
                weekweather["summary"],
                fill="black", anchor="mm", font=fnt_B,
                maxwidth=width - day_size
        )

        temp = []
        for day in daysweather[self.first_day:self.first_day+self.limit_futur]:
                temp.append(day["temperatureLow"])
                temp.append(day["temperatureHigh"])
        t_min = min(temp)
        t_max = max(temp)
        t_scale = (width - day_size - 30) / (t_max - t_min)

        i = 1
        for day in daysweather[self.first_day:self.first_day+self.limit_futur]:
            icon = Image.open("icons/" + WeatherAPI.get_icon(day["icon"])).resize((day_size, day_size))
            image.paste(icon, (0, i * day_size), icon)

            draw.text(
                (15 + 2 + day_size + int((day["temperatureLow"]-t_min)*t_scale), i*day_size + 4),
                "%d˚" % math.trunc(day["temperatureLow"]),
                fill="black", anchor="rt", font=fnt_R
            )
            summary_size = fnt_R.getsize(WeatherAPI().read_timestamp(day["time"]).strftime("%a") + " : " + day["summary"])[0]
            draw.text(
                (day_size + (width - day_size - summary_size) / 2, (i + 1) * day_size - 6),
                WeatherAPI().read_timestamp(day["time"]).strftime("%a") + " : ",
                fill="#666", anchor="ls", font=fnt_R
            )
            draw.text(
                (day_size + (width - day_size + summary_size) / 2, (i + 1) * day_size - 6),
                day["summary"],
                fill="black", anchor="rs", font=fnt_R
            )
            draw.text(
                (day_size + int((day["temperatureHigh"]-t_min)*t_scale) + 2, i * day_size + 4),
                "%d˚" % math.trunc(day["temperatureHigh"]),
                fill="black", anchor="lt", font=fnt_R
            )

            try:
                    draw.rounded_rectangle(
                            (15 + day_size + int((day["temperatureLow"]-t_min)*t_scale),i*day_size + 4,day_size + int((day["temperatureHigh"]-t_min)*t_scale),i*day_size + 14),
                            radius=5, fill="black")
            except AttributeError:
                    draw.rectangle(
                            (15 + day_size + int((day["temperatureLow"]-t_min)*t_scale),i*day_size + 4,day_size + int((day["temperatureHigh"]-t_min)*t_scale),i*day_size + 14),
                            fill="black")
            i += 1


        return image

class WeatherAlerts:

    def gen_alerts(self):
        alerts = []

        if WeatherAPI().has_alerts():
                for alert in WeatherAPI().get_alerts():
                        if alert["severity"] == "watch" or alert["title"].startswith("Moderate"):
                                icon = "wi-small-craft-advisory.png"
                        elif alert["severity"] == "warning":
                                icon = "wi-gale-warning.png"
                        else:
                                icon = None

                        startTime = WeatherAPI().read_timestamp(alert["time"])
                        endTime = WeatherAPI().read_timestamp(alert["expires"])
                        # Show alert timing if under a day
                        if startTime.hour != endTime.hour:
                                subtitle = startTime.strftime(("%x " if startTime.day != datetime.now().day else "") + "%X") + " - " + endTime.strftime(("%x " if startTime.day != endTime.day else "") + "%X")
                        elif startTime.day != datetime.now().day:
                                subtitle = startTime.strftime("%x")
                        else:
                                subtitle = ""

                        alerts.append({
                                "icon": icon,
                                "title": alert["title"],
                                "subtitle": subtitle,
                                "description": alert["description"],
                        })

        return alerts