#!/usr/bin/python3

import glob
import os
import sys,getopt
import subprocess
import time

# The gearings below were picked based on various tests by the ClockworkPi devs.
# The maximum-performance maximum-power gearing is present for completeness, but
# shouldn't be needed for most uses.
#
# You can customise the gearings by editing the list below. The valid freqencies
# for CPU <N> can be looked up here (substituting for <N>):
#     /sys/devices/system/cpu/cpu<N>/cpufreq/scaling_available_frequencies
#
#
# Gears are numbered in-order, starting from 1.
# It's up to you to ensure that they are sorted by performance :)
def gears():
    return [
        gear(
            little=(720000,),
            use="simple writing tasks with long battery life"),
        gear(
            little=(888000,) * 2,
            use="browsing most websites with long battery life"),
        gear(
            little=(1080000,) * 2,
            use="most 2D games and emulators"),
        gear(
            little=(1320000,) * 4,
            use="playing videos and 3D games"),
        gear(
            little=(1488000,) * 4,
            use="performance-first tasks"),
    ]

#GPU_GOV_SIMPLE = "simple_ondemand"
#GPU_GOV_PERF = "performance"

# Helper to convert the concise gear format above into a full description.
def gear(
    little=(0, 0, 0, 0),
    gpu_freq=200000000,
    use="",
):
    # Extend to 4 little (matching the A04).
    assert len(little) <= 4
    cpu = little + (0,) * (4 - len(little))

    # At least one CPU must be enabled
    assert sum(cpu) > 0
    return {
        "cpu": cpu,
        "use": use,
    }

# We placed gears() at the top of the file to make it easier to find and edit.
# Now that we've defined the helpers it needs, evaluate the gears.
gears = gears()

def load_gear(gear):
    return gears[gear - 1]


cur_stat = []
cur_stat.append("+-----------------------------------+")
cur_stat.append("|            Cortex-A53             |")
cur_stat.append("+--------+--------+--------+--------+")
cur_stat.append("| CPU 0  | CPU 1  | CPU 2  | CPU 3  |")
cur_stat.append("+--------+--------+--------+--------+")
cur_stat.append("| 600MHz | OFF    | OFF    | OFF    |") #5
cur_stat.append("+--------+--------+--------+--------+")


def isDigit(x):
    try:
        float(x)
        return True
    except ValueError:
        return False


class A04:
    cpus = []
    cpu_scaling_governor= "ondemand"
    gear       = load_gear(1) # 1-5
    null_out = "2>/dev/null"
    def __init__(self):
      self.cpus = []
      self.init_cpu_infos()
      self.cpu_total_count = len(self.cpus)

    def init_cpu_infos(self):
        self.cpus = glob.glob('/sys/devices/system/cpu/cpu[0-9]')
        self.cpus.sort()
    
    def get_cpu_gov(self):
        cpu_gov_path = "/sys/devices/system/cpu/cpufreq/policy0/scaling_governor"
        gov = ""
        with open(cpu_gov_path,"r") as f: gov = f.read().strip()
        return gov

    def set_cpu_gov0( self,gov):
        cpu_gov_path = "/sys/devices/system/cpu/cpufreq/policy0/scaling_governor"
        try:
            subprocess.run( "echo %s | sudo tee  %s " %(gov,cpu_gov_path),shell=True,stdout=subprocess.DEVNULL)
        except:
            print("set cpu governor failed")

    
    def get_cpu_on_off(self,cpu_num):
        cpu_onoff_file = "/sys/devices/system/cpu/cpu%d/online" % cpu_num
        onoff = "0"
        max_freq = "0"
        with open(cpu_onoff_file,"r") as f: onoff = f.read().strip()
        if onoff == "1":
            cpu_max_freq_file = "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_max_freq" % cpu_num
            with open(cpu_max_freq_file,"r") as f: max_freq = f.read().strip()
            mhz = int(max_freq)/1000
            return "%dMhz" % mhz
        
        return "OFF"
            
         
    def set_cpu_on_off(self,cpu_num,onoff):
        cpu_onoff_file = "/sys/devices/system/cpu/cpu%d/online" % cpu_num
        try:
            #print("echo %d | sudo tee  %s" %(onoff,cpu_onoff_file) )
            subprocess.run( "echo %d | sudo tee  %s" %(onoff,cpu_onoff_file),shell=True,stdout=subprocess.DEVNULL)
        except:
            print("set cpu %d on off failed" % cpu_num)

    def set_cpu_max_freq(self,cpu_num,max_freq):
        cpu_max_freq_file = "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_max_freq" % cpu_num
        try:
            subprocess.run( "echo %d | sudo tee  %s" %(max_freq,cpu_max_freq_file),shell=True,stdout=subprocess.DEVNULL)
        except:
            print("set cpu %d max freq failed" % cpu_num)

    def get_gpu_freq(self):
        gpu_sys_path = "/sys/devices/platform/ff9a0000.gpu/devfreq/ff9a0000.gpu"
        gpu_freq_path = os.path.join(gpu_sys_path,"max_freq")
        freq = ""
        with open(gpu_freq_path,"r") as f: freq = f.read().strip()
        mhz = int(freq)/1000000
        return "%dMHz" % mhz

    def set_gpu(self,gov,hz):
        gpu_sys_path = "/sys/devices/platform/ff9a0000.gpu/devfreq/ff9a0000.gpu"
        gpu_gov_path = os.path.join(gpu_sys_path,"governor")
        gpu_freq_path = os.path.join(gpu_sys_path,"max_freq")
        try:
            subprocess.run("echo %s | sudo tee %s" %(gov,gpu_gov_path),shell=True,stdout=subprocess.DEVNULL)
            subprocess.run("echo %d | sudo tee %s" %(hz, gpu_freq_path),shell=True,stdout=subprocess.DEVNULL)
        except:
            print("set gpu failed")


    def print_cpu_gov(self):
        print("CPU Governor: %s" % self.get_cpu_gov())
    
    def print_cur_status(self):
        global  cur_stat
        
        stat_str = "|%s|%s|%s|%s|"
 
        cpu0 = self.get_cpu_on_off(0).center(8)[:8]
        cpu1 = self.get_cpu_on_off(1).center(8)[:8]
        cpu2 = self.get_cpu_on_off(2).center(8)[:8]
        cpu3 = self.get_cpu_on_off(3).center(8)[:8]
        #gpu  = self.get_gpu_freq().center(11)[:11]
        
        table_str = stat_str %(cpu0,cpu1,cpu2,cpu3)
        print("\nCurrent Status:") 
        for idx,val in enumerate(cur_stat):
            if idx == 5:
                print(table_str)
            else:
                print(val)
        
        self.print_cpu_gov()
         
    def set_gear(self,g):
        self.gear = load_gear(g)

        for (cpu, freq) in enumerate(self.gear["cpu"]):
            enabled = freq > 0
            self.set_cpu_on_off(cpu, int(enabled))
            if enabled:
                self.set_cpu_max_freq(cpu, freq)

        #self.set_gpu(self.gear["gpu_gov"], self.gear["gpu_freq"])

        # TODO: Generalise this

        self.set_cpu_gov0(self.cpu_scaling_governor)

def print_gear_map(gear):
    print("    +-----------------------------------+")
    print("    |            Cortex-A53             |")
    print("    +--------+--------+--------+--------+")
    print("    | CPU 0  | CPU 1  | CPU 2  | CPU 3  |")
    div = "+---+--------+--------+--------+--------+"
    print(div)

    def freq(khz):
        mhz = khz/1000
        if mhz >= 1000:
            return "%d MHz" % mhz
        elif mhz > 0:
            return " %d MHz" % mhz
        else:
            return "  OFF   "

    for idx, val in enumerate(gears):
        g = idx + 1
        selected = g == gear
        print("|%s|%s|%s" % (("*%s*" if selected else " %s ") % g,"|".join([freq(cpu) for cpu in val["cpu"]])," <===" if selected else "",))
        print(div)

def print_help_msg():
    print("Usage: devterm-a04-gearbox [OPTION]...")
    print("Show or set the CPU operating frequency,online status and GPU operating frequency for DevTerm A04.")
    print()
    print(" -s, --set [n] set a speed mode between the number 1-%d:" % len(gears))
    for (i, _) in enumerate(gears):
        print("               %d for %s." % (i + 1, gears[i]["use"]))
    print()
    print("Examples:")
    # TODO: Generate this example
    print("Set to mode 1, single core @720MHz(max)")
    print("   $ devterm-a04-gearbox -s 1")

def is_root():
    return os.geteuid() == 0

def main(argv):
    gear   = 1
    try:
        opts, args = getopt.getopt(argv,"hs:",["set="])
    except getopt.GetoptError:
        print_help_msg()
        sys.exit(2)
    for opt, arg in opts:
        if opt == '-h':
            print_help_msg()
            sys.exit()
        elif opt in ("-s","--set"):
            if(isDigit(arg)):
                gear = int(arg)
                if gear not in range(1, len(gears) + 1):
                    print("illegal input: mode range 1-%d" % len(gears))
                    sys.exit(-1)
           
    
    DT = A04()
 
    if len(argv) == 0:
        DT.print_cur_status()
        sys.exit(0)

    DT = A04()
    if is_root():
        DT.set_gear(gear)
        print_gear_map(gear)
        DT.print_cpu_gov()
    else:
        print("Require super user privilege to set mode,try run it with sudo")
        sys.exit(1)

if __name__ == "__main__":
    main(sys.argv[1:])