#!/usr/bin/env python

import os, glob, re, sys

from param import *
from wikiemit import WikiEmit
from xmlemit import XmlEmit
from htmlemit import HtmlEmit

from optparse import OptionParser
parser = OptionParser("param_parse.py [options]")
parser.add_option("-v", "--verbose", dest='verbose', action='store_true', default=False, help="show debugging output")
parser.add_option("--vehicle", default='*',  help="Vehicle type to generate for")
(opts, args) = parser.parse_args()


# Regular expressions for parsing the parameter metadata

prog_param = re.compile(r"@Param: *(\w+).*((?:\n[ \t]*// @(\w+): (.*))+)(?:\n\n|\n[ \t]+[A-Z])", re.MULTILINE)

prog_param_fields = re.compile(r"[ \t]*// @(\w+): (.*)")
    
prog_groups = re.compile(r"@Group: *(\w+).*((?:\n[ \t]*// @(Path): (\S+))+)", re.MULTILINE)
    
prog_group_param = re.compile(r"@Param: (\w+).*((?:\n[ \t]*// @(\w+): (.*))+)(?:\n\n|\n[ \t]+[A-Z])", re.MULTILINE)

apm_path = os.path.join(os.path.dirname(os.path.realpath(__file__)), '../../../')
vehicle_paths = glob.glob(apm_path + "%s/Parameters.cpp" % opts.vehicle)
extension = 'cpp'
if len(vehicle_paths) == 0:
    vehicle_paths = glob.glob(apm_path + "%s/Parameters.pde" % opts.vehicle)
    extension = 'pde'
vehicle_paths.sort(reverse=True)

vehicles = []
libraries = []

error_count = 0

def debug(str):
    '''debug output if verbose is set'''
    if opts.verbose:
        print(str)

def error(str):
    '''show errors'''
    global error_count
    error_count += 1
    print(str)

for vehicle_path in vehicle_paths:
    name = os.path.basename(os.path.dirname(vehicle_path))
    path = os.path.normpath(os.path.dirname(vehicle_path))
    vehicles.append(Vehicle(name, path))
    debug('Found vehicle type %s' % name)
    
for vehicle in vehicles:
    debug("===\n\n\nProcessing %s" % vehicle.name)
    
    f = open(vehicle.path+'/Parameters.' + extension)
    p_text = f.read()
    f.close()        

    param_matches = prog_param.findall(p_text)
    group_matches = prog_groups.findall(p_text)
    
    debug(group_matches)
    for group_match in group_matches:
        l = Library(group_match[0])
        fields = prog_param_fields.findall(group_match[1])
        for field in fields:
            if field[0] in known_group_fields:
                setattr(l, field[0], field[1])
            else:
                error("unknown parameter metadata field '%s'" % field[0])
        if not any(l.name == parsed_l.name for parsed_l in libraries):
            libraries.append(l)
        
        
        
    for param_match in param_matches:
        p = Parameter(vehicle.name+":"+param_match[0])
        debug(p.name + ' ')
        field_text = param_match[1]
        fields = prog_param_fields.findall(field_text)
        field_list = []
        for field in fields:
            field_list.append(field[0])
            if field[0] in known_param_fields:
                setattr(p, field[0], field[1])
            else:
                error("unknown parameter metadata field '%s'" % field[0])
        for req_field in required_param_fields:
            if not req_field in field_list:
                error("missing parameter metadata field '%s' in %s" % (req_field, field_text))
                
                
        vehicle.params.append(p)
        
    debug("Processed %u params" % len(vehicle.params))
    
debug("Found %u documented libraries" % len(libraries))

for library in libraries:
    debug("===\n\n\nProcessing library %s" % library.name)
    
    if hasattr(library, 'Path'):   
        paths = library.Path.split(',')
        for path in paths:
            path = path.strip()
            debug("\n Processing file '%s'" % path)
            if path.endswith('.pde') or path.find('/') == -1:
                if len(vehicles) != 1:
                    print("Unable to handle multiple vehicles with .pde library")
                    continue
                libraryfname = os.path.join(vehicles[0].path, path)
            else:
                libraryfname = os.path.normpath(os.path.join(apm_path + '/libraries/' + path))
            if path and os.path.exists(libraryfname):
                f = open(libraryfname)
                p_text = f.read()
                f.close()
            else:
                error("Path %s not found for library %s" % (path, library.name))
                continue
            
            param_matches = prog_group_param.findall(p_text)
            debug("Found %u documented parameters" % len(param_matches))
            for param_match in param_matches:
                p = Parameter(library.name+param_match[0])
                debug(p.name + ' ')
                field_text = param_match[1]
                fields = prog_param_fields.findall(field_text)
                for field in fields:
                    if field[0] in known_param_fields:
                        setattr(p, field[0], field[1])
                    else:
                        error("unknown parameter metadata field %s" % field[0])
                    
                library.params.append(p)
    else:
        error("Skipped: no Path found")

    debug("Processed %u documented parameters" % len(library.params))

    def do_emit(emit):
        for vehicle in vehicles:
            emit.emit(vehicle, f)
        
        emit.start_libraries()
            
        for library in libraries:
            if library.params:
                emit.emit(library, f)
           
        emit.close()
    
    do_emit(XmlEmit())
    do_emit(WikiEmit())
    do_emit(HtmlEmit())

sys.exit(error_count)
