import ConfigParser
import os
import wx
from configtool.data import BSIZESMALL, offsetTcLabel

INIFILE = "configtool.ini"
DEFAULT_INIFILE = "configtool.default.ini"

ARDUINODIR = 0
CFLAGS = 1
LDFLAGS = 2
OBJCOPYFLAGS= 3
PROGRAMMER = 4
PROGRAMFLAGS = 5
PORT = 6
UPLOADSPEED = 7
NUMTEMPS = 8
MINADC = 9
MAXADC = 10
T0 = 11
R1 = 12


class Settings:
  def __init__(self, app, folder, ini=None):
    self.app = app
    self.folder = folder
    self.inifile = os.path.join(folder, INIFILE)
    self.section = "configtool"

    self.arduinodir = ""
    self.cflags = ""
    self.ldflags = ""
    self.objcopyflags = ""
    self.programmer = "wiring"
    self.programflags = ""
    self.port = "/dev/ttyACM0"
    self.uploadspeed = 38400

    self.t0 = 25;
    self.r1 = 0;
    self.numTemps = 25
    self.maxAdc = 1023
    self.minAdc = 1

    # Runtime settings
    self.verbose = 0

    self.cfg = ConfigParser.ConfigParser()
    self.cfg.optionxform = str

    self.loaded = self.readConfig(ini)

  def readConfig(self, ini):
    if ini:
      if not self.cfg.read(ini):
        return False
    else:
      if not self.cfg.read(self.inifile):
        if not self.cfg.read(os.path.join(self.folder, DEFAULT_INIFILE)):
          print ("Neither of settings files %s or %s exist. Using default values."
                 % (INIFILE, DEFAULT_INIFILE))
          return False

    if self.cfg.has_section(self.section):
      for opt, value in self.cfg.items(self.section):
        value = value.replace('\n', ' ')
        if opt == "arduinodir":
          self.arduinodir = value
        elif opt == "cflags":
          self.cflags = value
        elif opt == "ldflags":
          self.ldflags = value
        elif opt == "programmer":
          self.programmer = value
        elif opt == "port":
          self.port = value
        elif opt == "objcopyflags":
          self.objcopyflags = value
        elif opt == "programflags":
          self.programflags = value
        elif opt == "t0":
          self.t0 = value
        elif opt == "r1":
          self.r1 = value
        elif opt == "numtemps":
          self.numTemps = value
        elif opt == "maxadc":
          self.maxAdc = value
        elif opt == "minadc":
          self.minAdc = value
        elif opt == "uploadspeed":
          self.uploadspeed = value
        else:
          print "Unknown %s option: %s - ignoring." % (self.section, opt)
    else:
      print "Missing %s section - assuming defaults." % self.section
      return False

    return True

  def getValues(self):
    return {
      "arduinodir": str(self.arduinodir),
      "cflags": str(self.cflags),
      "ldflags": str(self.ldflags),
      "objcopyflags": str(self.objcopyflags),
      "programmer": str(self.programmer),
      "port": str(self.port),
      "t0": str(self.t0),
      "r1": str(self.r1),
      "numtemps": str(self.numTemps),
      "maxadc": str(self.maxAdc),
      "minadc": str(self.minAdc),
      "uploadspeed": str(self.uploadspeed)
    }

  def saveSettings(self, inifile = None):
    if not inifile:
      inifile = self.inifile

    self.section = "configtool"
    try:
      self.cfg.add_section(self.section)
    except ConfigParser.DuplicateSectionError:
      pass

    values = self.getValues()
    for k in values.keys():
      self.cfg.set(self.section, k, values[k])

    try:
      cfp = open(inifile, 'wb')
    except:
      print("Unable to open settings file %s for writing." % inifile)
      return False

    self.cfg.write(cfp)
    cfp.close()

    return True


class SettingsDlg(wx.Dialog):
  def __init__(self, parent, settings):
    wx.Dialog.__init__(self, parent, wx.ID_ANY, "Modify settings",
                       size = (500, 300))
    self.SetFont(settings.font)
    self.settings = settings

    self.modified = False

    self.Bind(wx.EVT_CLOSE, self.onExit)

    htArdDir = "Path to the Arduino IDE folder. Configtool will figure the " \
               "details on where to find avr-gcc and avrdude inside there." \
               "\n\nIf empty, the system wide installed tools will be used."
    htCFlags = "Flags passed into the avr-gcc compiler. These flags can " \
               "have 3 different variables embedded within them:" \
               "\n\n  %F_CPU%   will be replaced by the value of the CPU " \
               "Clock Rate." \
               "\n\n  %CPU%     will be replaced by the value of the CPU. " \
               "\n\n  %ALNAME%  is the name of the source file being " \
               "compiled with the .c extension replaced by .al.\n\n" \
               "Note: the flag -save-temps=obj does not appear to be a " \
               "valid flag for some compiler versions. Omit the \"=obj\", " \
               "omit the flag entirely, or simply ignore the related warnings."
    htLDFlags = "Flags passed to avr-gcc to be passed on to the linker."
    htObjCopy = "Flags passed to avr-objcopy."
    htProgrammer = "The programmer type - passed to avrdude."
    htProgramFlags = "Extra flags passed to avrdude."
    htPort = "The port to which the controller is connected. Typically a " \
             "path starting with /dev/... on Linux or Mac OS X, or some " \
             "COM... on Windows."
    htSpeed = "The baud rate with which to communicate with the bootloader."
    htNumTemps = "The number of entries generated for the thermistor tables. " \
                 "Higher numbers slightly increase temperature reading " \
                 "accuracy, but also cost binary size. Default is 25."
    htMinAdc = "The minimum ADC value returned by the thermistor. Typically 0."
    htMaxAdc = "The maximum ADC value returned by the thermistor. " \
               "Typically 1023 (maximum of 10-bit ADCs)."
    htT0 = "The T0 value used for thermistor table calculation. Typically 25."
    htR1 = "The R1 value used for thermistor table calculation. Typically 0."

    # This table MUST be in the same order as the constants defined at
    # the top of this file.
    self.fields = [["Arduino Directory", settings.arduinodir, htArdDir],
                   ["C Compiler Flags", settings.cflags, htCFlags],
                   ["LD Flags", settings.ldflags, htLDFlags],
                   ["Object Copy Flags", settings.objcopyflags, htObjCopy],
                   ["AVR Programmer", settings.programmer, htProgrammer],
                   ["AVR Upload Flags", settings.programflags, htProgramFlags],
                   ["Port", settings.port, htPort],
                   ["Upload Speed", settings.uploadspeed, htSpeed],
                   ["Number of Temps", settings.numTemps, htNumTemps],
                   ["Minimum ADC value", settings.minAdc, htMinAdc],
                   ["Maximum ADC value", settings.maxAdc, htMaxAdc],
                   ["T0", settings.t0, htT0],
                   ["R1", settings.r1, htR1]]

    self.teList = []

    hsz = wx.BoxSizer(wx.HORIZONTAL)
    hsz.AddSpacer((10, 10))

    sz = wx.BoxSizer(wx.VERTICAL)
    sz.AddSpacer((10, 10))

    labelWidth = 140
    for f in self.fields:
      lsz = wx.BoxSizer(wx.HORIZONTAL)
      t = wx.StaticText(self, wx.ID_ANY, f[0], size = (labelWidth, -1),
                        style = wx.ALIGN_RIGHT)
      t.SetFont(settings.font)
      lsz.Add(t, 1, wx.TOP, offsetTcLabel)

      lsz.AddSpacer((8, 8))

      te = wx.TextCtrl(self, wx.ID_ANY, f[1], size = (600, -1))
      te.Bind(wx.EVT_TEXT, self.onTextCtrl)
      te.SetToolTipString(f[2])
      lsz.Add(te)
      self.teList.append(te)

      sz.Add(lsz)
      sz.AddSpacer((10, 10))

    sz.AddSpacer((20, 20))

    bsz = wx.BoxSizer(wx.HORIZONTAL)
    b = wx.Button(self, wx.ID_ANY, "Save", size = BSIZESMALL)
    b.SetFont(settings.font)
    self.Bind(wx.EVT_BUTTON, self.onSave, b)
    bsz.Add(b)
    self.bSave = b
    bsz.AddSpacer((5, 5))

    b = wx.Button(self, wx.ID_ANY, "Exit", size = BSIZESMALL)
    b.SetFont(settings.font)
    self.Bind(wx.EVT_BUTTON, self.onExit, b)
    bsz.Add(b)
    self.bExit = b

    sz.Add(bsz, 1, wx.ALIGN_CENTER_HORIZONTAL)
    sz.AddSpacer((10, 10))

    hsz.Add(sz)
    hsz.AddSpacer((10, 10))

    self.SetSizer(hsz)
    self.setModified(False)

    self.Fit()

  def setModified(self, flag):
    self.modified = flag
    if flag:
      self.bSave.Enable(True)
      self.bExit.SetLabel("Cancel")
    else:
      self.bSave.Enable(False)
      self.bExit.SetLabel("Exit")

  def onTextCtrl(self, evt):
    self.setModified(True)
    evt.Skip()

  def onSave(self, evt):
    self.saveValues()
    self.EndModal(wx.ID_OK)

  def saveValues(self):
    self.settings.arduinodir = self.teList[ARDUINODIR].GetValue()
    self.settings.cflags = self.teList[CFLAGS].GetValue()
    self.settings.ldflags = self.teList[LDFLAGS].GetValue()
    self.settings.objcopyflags = self.teList[OBJCOPYFLAGS].GetValue()
    self.settings.programmer = self.teList[PROGRAMMER].GetValue()
    self.settings.programflags = self.teList[PROGRAMFLAGS].GetValue()
    self.settings.port = self.teList[PORT].GetValue()
    self.settings.uploadspeed = self.teList[UPLOADSPEED].GetValue()
    self.settings.numTemps = self.teList[NUMTEMPS].GetValue()
    self.settings.minAdc = self.teList[MINADC].GetValue()
    self.settings.maxAdc = self.teList[MAXADC].GetValue()
    self.settings.t0 = self.teList[T0].GetValue()
    self.settings.r1 = self.teList[R1].GetValue()

    self.settings.saveSettings()

  def onExit(self, evt):
    if not self.confirmLoseChanges("exit"):
      return
    self.EndModal(wx.ID_EXIT)

  def confirmLoseChanges(self, msg):
    if not self.modified:
      return True

    dlg = wx.MessageDialog(self, "Are you sure you want to " + msg + "?\n"
                                 "There are changes to your settings that "
                                 "will be lost.",
                           "Changes pending",
                           wx.YES_NO | wx.NO_DEFAULT | wx.ICON_INFORMATION)
    rc = dlg.ShowModal()
    dlg.Destroy()

    if rc != wx.ID_YES:
      return False

    return True