import os
import json
import argparse


def get_arch_data(repo):
    # fetch architecture and tools info from the settings file and write a temproary rst file
    # for inclusion in the "befire you start" section
    settingsFile = repo + '/settings.json'
    if os.path.isfile(settingsFile): 
        with open(settingsFile) as infile:
            data = json.load(infile)
        try:
            return data['architectures']
        except KeyError:
            print("No architecture or tools info available, no architeture_tools_info page created.") 
            exit()
    else:
        print("No settings file found, no architeture_tools_info page created.")
        exit()


def build_arch_tools_page(arch, rstFile):

    headingC0 = "Architecture"
    headingC1 = "Tools version"

    with open(rstFile, "w") as outFile:
        outFile.write("Supported xcore architectures and required tools\n")
        outFile.write("================================================\n")
        outFile.write("\n")


        a=0
        a0=len(headingC0)
        b=0
        b0=len(headingC1)

        for k in arch.keys():
            a=max(len(k), a, a0)
            for v in arch[k]:
                b=max(len(v), b, b0)

        divc0=""
        for i in range(0,a+2): divc0+="-"
        divc1=""
        for i in range(0,b+2): divc1+="-"
        outFile.write(("+{}+{}+\n").format(divc0, divc1))

        padc0=""
        for i in range(0,a-a0): padc0+=" "
        padc1=""
        for i in range(0,b-b0): padc1+=" "
        outFile.write(("| {}{} | {}{} |\n").format(headingC0, padc0, headingC1, padc1))

        barc0=""
        for i in range(0,a+2): barc0+="="
        barc1=""
        for i in range(0,b+2): barc1+="="
        outFile.write(("+{}+{}+\n").format(barc0, barc1))


        for k in arch.keys():
            for v in arch[k]:
                pada=""
                for i in range(0,a-len(k)): pada+=" "
                padb=""
                for i in range(0,b-len(v)): padb+=" "
                outFile.write(("| {}{} | {}{} |\n").format(k, pada, v, padb))
                outFile.write(("+{}+{}+\n").format(divc0, divc1))

        outFile.close()



if __name__ == "__main__":
    parser = argparse.ArgumentParser()
    parser.add_argument("-p", help='path to repo')
    parser.add_argument("-o", default='./_templates/architecture_tools_info.rst', help='optional path and filename of the resulting html file.')
    args = parser.parse_args()
    build_arch_tools_page(get_arch_data(args.p), args.o)