import subprocess
import sys
import json
from ast import literal_eval

class fonttest:


    def __init__(self, config):
        self.fontname = config["fontname"]
        self.coverage_lang_list = config["lang"]
        self.logfilepath = config["logfilepath"]
        self.out = dict()
        self.out["err"] = list()
        self.test_init()


    def execute_command(self, command_str):
        '''
        Execute cli commands and return output
        '''
        out, err = subprocess.Popen(command_str, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE).communicate()
        return (str(out, 'utf-8'), str(err, 'utf-8'))


    def get_font_family(self):
        '''
        This function will excute fc-list and create fontfamily, font file path list  
        '''
        # get font family
        font_family, err = self.execute_command("fc-list | grep {0} | cut -d':' -f2".format(self.fontname)) 
        #get all font file path
        font_filepath, err = self.execute_command("fc-list | grep {0} | cut -d':' -f1".format(self.fontname))
        font_filepath = font_filepath.split("\n")
        self.out["font file list"] = list(filter(None, font_filepath))

        # if font file exist create a font family list
        if not err and font_family:
            font_family = set(font_family.split("\n"))
            font_family = map(str.strip, font_family)
            self.out["font family list"] = list(filter(None, font_family))
            # return self.out_font_family
        else:
            self.out["err"].append("invalid test or parameter in font family test")
            self.out["err"].append(err)
            sys.stdout.write("invalid test or parameter in font family test")
        

    def get_font_conf(self):
        '''
        This function will get all conf file path for given font
        '''

        # get list of font conf files 
        font_conflist, err = self.execute_command("fc-conflist | grep {0}".format(self.fontname))
        
        if not err and font_conflist: 
            font_conflist = font_conflist.split("\n")
            self.out["font conf list"] = list(filter(None, font_conflist))
        else:
            self.out["err"].append("invalid test or parameter in font conf test")
            self.out["err"].append(err)
            sys.stdout.write("invalid test or parameter in font conf test")

    def get_lang_coverage(self):
        '''
        This function will check language coverage as specifed in parameter with fontfiles 
        '''

        self.out["lang covarage"] = dict()
        for font_file_path in self.out["font file list"]:
            # get all lang covarage by font    
            font_langlist, err = self.execute_command("fc-query -f 'lang: %{lang}' "+font_file_path) 
            PendingDeprecationWarning
            if not err and font_langlist: 
                font_langlist = font_langlist.split("|")
                font_langlist[0] = font_langlist[0].replace("lang: ","")
                out_lang_dict = dict()
                for lang in self.coverage_lang_list:
                    out_lang_dict[lang] = lang in font_langlist
                
                self.out["lang covarage"][font_file_path] = out_lang_dict

                if False in out_lang_dict.values():
                    self.out["err"].append("one or more lang coverage failed for font file:{0}".format(font_file_path))
                    self.out["err"].append(out_lang_dict)
                    sys.stdout.write("fail")
            else:
                self.out["err"].append("invalid test or parameter in font lang coverage test")
                self.out["err"].append(err)
                sys.stdout.write("invalid test or parameter in font lang coverage test")
    

    def testlog_generator(self):
        '''
        This function will generate a testlog and dump all metainfo generated into /tmp/test.log
        '''
        with open(self.logfilepath, "w") as file:

            file.write("\nErrors:\n")
            if not self.out["err"]:     
                file.write("No errors")
            else:
                Json = json.dumps(self.out["err"])
                file.write(Json)    

            file.write("\n\nFont Family list:\n")
            file.write("\n".join(self.out["font family list"]))

            file.write("\n\nFont conf list:\n")
            file.write("\n".join(self.out["font conf list"]))
            
            file.write("\n\nFont file list:\n")
            file.write("\n".join(self.out["font file list"]))
            
            file.write("\n\nLang coverage:\n")
            Json = json.dumps(self.out["lang covarage"])
            for key, value in self.out["lang covarage"].items():
                jvalue = json.dumps(value)
                file.write(key +" : "+ jvalue+"\n")


    def test_init(self):
        '''
        This function invokes all other test methods.
        '''
        
        self.get_font_family()
        self.get_font_conf()
        self.get_lang_coverage()
        self.testlog_generator()

        if self.out["err"]:
            sys.stderr.write("Test failed\n")
        else:
            sys.stdout.write("All Test Passed\n")


if __name__ == "__main__":
    config = literal_eval(sys.argv[1])
    fonttest(config)