#!/usr/bin/env python3
#
# schema.py
#
# Used by signature.py via common-dependencies.py to generate a schema file during the PlatformIO build.
# This script can also be run standalone from within the Marlin repo to generate all schema files.
#
import re,json
from pathlib import Path

def extend_dict(d:dict, k:tuple):
    if len(k) >= 1 and k[0] not in d:
        d[k[0]] = {}
    if len(k) >= 2 and k[1] not in d[k[0]]:
        d[k[0]][k[1]] = {}
    if len(k) >= 3 and k[2] not in d[k[0]][k[1]]:
        d[k[0]][k[1]][k[2]] = {}

grouping_patterns = [
    re.compile(r'^([XYZIJKUVW]|[XYZ]2|Z[34]|E[0-7])$'),
    re.compile(r'^AXIS\d$'),
    re.compile(r'^(MIN|MAX)$'),
    re.compile(r'^[0-8]$'),
    re.compile(r'^HOTEND[0-7]$'),
    re.compile(r'^(HOTENDS|BED|PROBE|COOLER)$'),
    re.compile(r'^[XYZIJKUVW]M(IN|AX)$')
]
# If the indexed part of the option name matches a pattern
# then add it to the dictionary.
def find_grouping(gdict, filekey, sectkey, optkey, pindex):
    optparts = optkey.split('_')
    if 1 < len(optparts) > pindex:
        for patt in grouping_patterns:
            if patt.match(optparts[pindex]):
                subkey = optparts[pindex]
                modkey = '_'.join(optparts)
                optparts[pindex] = '*'
                wildkey = '_'.join(optparts)
                kkey = f'{filekey}|{sectkey}|{wildkey}'
                if kkey not in gdict: gdict[kkey] = []
                gdict[kkey].append((subkey, modkey))

# Build a list of potential groups. Only those with multiple items will be grouped.
def group_options(schema):
    for pindex in range(10, -1, -1):
        found_groups = {}
        for filekey, f in schema.items():
            for sectkey, s in f.items():
                for optkey in s:
                    find_grouping(found_groups, filekey, sectkey, optkey, pindex)

        fkeys = [ k for k in found_groups.keys() ]
        for kkey in fkeys:
            items = found_groups[kkey]
            if len(items) > 1:
                f, s, w = kkey.split('|')
                extend_dict(schema, (f, s, w))                      # Add wildcard group to schema
                for subkey, optkey in items:                        # Add all items to wildcard group
                    schema[f][s][w][subkey] = schema[f][s][optkey]  # Move non-wildcard item to wildcard group
                    del schema[f][s][optkey]
            del found_groups[kkey]

# Extract all board names from boards.h
def load_boards():
    bpath = Path("Marlin/src/core/boards.h")
    if bpath.is_file():
        with bpath.open() as bfile:
            boards = []
            for line in bfile:
                if line.startswith("#define BOARD_"):
                    bname = line.split()[1]
                    if bname != "BOARD_UNKNOWN": boards.append(bname)
            return "['" + "','".join(boards) + "']"
    return ''

#
# Extract a schema from the current configuration files
#
def extract():
    # Load board names from boards.h
    boards = load_boards()

    # Parsing states
    class Parse:
        NORMAL          = 0 # No condition yet
        BLOCK_COMMENT   = 1 # Looking for the end of the block comment
        EOL_COMMENT     = 2 # EOL comment started, maybe add the next comment?
        GET_SENSORS     = 3 # Gathering temperature sensor options
        ERROR           = 9 # Syntax error

    # List of files to process, with shorthand
    filekey = { 'Configuration.h':'basic', 'Configuration_adv.h':'advanced' }
    # A JSON object to store the data
    sch_out = { 'basic':{}, 'advanced':{} }
    # Regex for #define NAME [VALUE] [COMMENT] with sanitized line
    defgrep = re.compile(r'^(//)?\s*(#define)\s+([A-Za-z0-9_]+)\s*(.*?)\s*(//.+)?$')
    # Defines to ignore
    ignore = ('CONFIGURATION_H_VERSION', 'CONFIGURATION_ADV_H_VERSION', 'CONFIG_EXAMPLES_DIR', 'CONFIG_EXPORT')
    # Start with unknown state
    state = Parse.NORMAL
    # Serial ID
    sid = 0
    # Loop through files and parse them line by line
    for fn, fk in filekey.items():
        with Path("Marlin", fn).open() as fileobj:
            section = 'none'        # Current Settings section
            line_number = 0         # Counter for the line number of the file
            conditions = []         # Create a condition stack for the current file
            comment_buff = []       # A temporary buffer for comments
            options_json = ''       # A buffer for the most recent options JSON found
            eol_options = False     # The options came from end of line, so only apply once
            join_line = False       # A flag that the line should be joined with the previous one
            line = ''               # A line buffer to handle \ continuation
            last_added_ref = None   # Reference to the last added item
            # Loop through the lines in the file
            for the_line in fileobj.readlines():
                line_number += 1

                # Clean the line for easier parsing
                the_line = the_line.strip()

                if join_line:   # A previous line is being made longer
                    line += (' ' if line else '') + the_line
                else:           # Otherwise, start the line anew
                    line, line_start = the_line, line_number

                # If the resulting line ends with a \, don't process now.
                # Strip the end off. The next line will be joined with it.
                join_line = line.endswith("\\")
                if join_line:
                    line = line[:-1].strip()
                    continue
                else:
                    line_end = line_number

                defmatch = defgrep.match(line)

                # Special handling for EOL comments after a #define.
                # At this point the #define is already digested and inserted,
                # so we have to extend it
                if state == Parse.EOL_COMMENT:
                    # If the line is not a comment, we're done with the EOL comment
                    if not defmatch and the_line.startswith('//'):
                        comment_buff.append(the_line[2:].strip())
                    else:
                        last_added_ref['comment'] = ' '.join(comment_buff)
                        comment_buff = []
                        state = Parse.NORMAL

                def use_comment(c, opt, sec, bufref):
                    if c.startswith(':'):               # If the comment starts with : then it has magic JSON
                        d = c[1:].strip()               # Strip the leading :
                        cbr = c.rindex('}') if d.startswith('{') else c.rindex(']') if d.startswith('[') else 0
                        if cbr:
                            opt, cmt = c[1:cbr+1].strip(), c[cbr+1:].strip()
                            if cmt != '': bufref.append(cmt)
                        else:
                            opt = c[1:].strip()
                    elif c.startswith('@section'):      # Start a new section
                        sec = c[8:].strip()
                    elif not c.startswith('========'):
                        bufref.append(c)
                    return opt, sec

                # In a block comment, capture lines up to the end of the comment.
                # Assume nothing follows the comment closure.
                if state in (Parse.BLOCK_COMMENT, Parse.GET_SENSORS):
                    endpos = line.find('*/')
                    if endpos < 0:
                        cline = line
                    else:
                        cline, line = line[:endpos].strip(), line[endpos+2:].strip()

                        # Temperature sensors are done
                        if state == Parse.GET_SENSORS:
                            options_json = f'[ {options_json[:-2]} ]'

                        state = Parse.NORMAL

                    # Strip the leading '*' from block comments
                    if cline.startswith('*'): cline = cline[1:].strip()

                    # Collect temperature sensors
                    if state == Parse.GET_SENSORS:
                        sens = re.match(r'^(-?\d+)\s*:\s*(.+)$', cline)
                        if sens:
                            s2 = sens[2].replace("'","''")
                            options_json += f"{sens[1]}:'{s2}', "

                    elif state == Parse.BLOCK_COMMENT:

                        # Look for temperature sensors
                        if cline == "Temperature sensors available:":
                            state, cline = Parse.GET_SENSORS, "Temperature Sensors"

                        options_json, section = use_comment(cline, options_json, section, comment_buff)

                # For the normal state we're looking for any non-blank line
                elif state == Parse.NORMAL:
                    # Skip a commented define when evaluating comment opening
                    st = 2 if re.match(r'^//\s*#define', line) else 0
                    cpos1 = line.find('/*')     # Start a block comment on the line?
                    cpos2 = line.find('//', st) # Start an end of line comment on the line?

                    # Only the first comment starter gets evaluated
                    cpos = -1
                    if cpos1 != -1 and (cpos1 < cpos2 or cpos2 == -1):
                        cpos = cpos1
                        comment_buff = []
                        state = Parse.BLOCK_COMMENT
                        eol_options = False

                    elif cpos2 != -1 and (cpos2 < cpos1 or cpos1 == -1):
                        cpos = cpos2

                        # Comment after a define may be continued on the following lines
                        if defmatch != None and cpos > 10:
                            state = Parse.EOL_COMMENT
                            comment_buff = []

                    # Process the start of a new comment
                    if cpos != -1:
                        cline, line = line[cpos+2:].strip(), line[:cpos].strip()

                        if state == Parse.BLOCK_COMMENT:
                            # Strip leading '*' from block comments
                            if cline.startswith('*'): cline = cline[1:].strip()
                        else:
                            # Expire end-of-line options after first use
                            if cline.startswith(':'): eol_options = True

                        # Buffer a non-empty comment start
                        if cline != '':
                            options_json, section = use_comment(cline, options_json, section, comment_buff)

                    # If the line has nothing before the comment, go to the next line
                    if line == '':
                        options_json = ''
                        continue

                    # Parenthesize the given expression if needed
                    def atomize(s):
                        if s == '' \
                        or re.match(r'^[A-Za-z0-9_]*(\([^)]+\))?$', s) \
                        or re.match(r'^[A-Za-z0-9_]+ == \d+?$', s):
                            return s
                        return f'({s})'

                    #
                    # The conditions stack is an array containing condition-arrays.
                    # Each condition-array lists the conditions for the current block.
                    # IF/N/DEF adds a new condition-array to the stack.
                    # ELSE/ELIF/ENDIF pop the condition-array.
                    # ELSE/ELIF negate the last item in the popped condition-array.
                    # ELIF adds a new condition to the end of the array.
                    # ELSE/ELIF re-push the condition-array.
                    #
                    cparts = line.split()
                    iselif, iselse = cparts[0] == '#elif', cparts[0] == '#else'
                    if iselif or iselse or cparts[0] == '#endif':
                        if len(conditions) == 0:
                            raise Exception(f'no #if block at line {line_number}')

                        # Pop the last condition-array from the stack
                        prev = conditions.pop()

                        if iselif or iselse:
                            prev[-1] = '!' + prev[-1] # Invert the last condition
                            if iselif: prev.append(atomize(line[5:].strip()))
                            conditions.append(prev)

                    elif cparts[0] == '#if':
                        conditions.append([ atomize(line[3:].strip()) ])
                    elif cparts[0] == '#ifdef':
                        conditions.append([ f'defined({line[6:].strip()})' ])
                    elif cparts[0] == '#ifndef':
                        conditions.append([ f'!defined({line[7:].strip()})' ])

                    # Handle a complete #define line
                    elif defmatch != None:

                        # Get the match groups into vars
                        enabled, define_name, val = defmatch[1] == None, defmatch[3], defmatch[4]

                        # Increment the serial ID
                        sid += 1

                        # Create a new dictionary for the current #define
                        define_info = {
                            'section': section,
                            'name': define_name,
                            'enabled': enabled,
                            'line': line_start,
                            'sid': sid
                        }

                        # Type is based on the value
                        if val == '':
                            value_type = 'switch'
                        elif re.match(r'^(true|false)$', val):
                            value_type = 'bool'
                            val = val == 'true'
                        elif re.match(r'^[-+]?\s*\d+$', val):
                            value_type = 'int'
                            val = int(val)
                        elif re.match(r'[-+]?\s*(\d+\.|\d*\.\d+)([eE][-+]?\d+)?[fF]?', val):
                            value_type = 'float'
                            val = float(val.replace('f',''))
                        else:
                            value_type = 'string'   if val[0] == '"' \
                                    else 'char'     if val[0] == "'" \
                                    else 'state'    if re.match(r'^(LOW|HIGH)$', val) \
                                    else 'enum'     if re.match(r'^[A-Za-z0-9_]{3,}$', val) \
                                    else 'int[]'    if re.match(r'^{(\s*[-+]?\s*\d+\s*(,\s*)?)+}$', val) \
                                    else 'float[]'  if re.match(r'^{(\s*[-+]?\s*(\d+\.|\d*\.\d+)([eE][-+]?\d+)?[fF]?\s*(,\s*)?)+}$', val) \
                                    else 'array'    if val[0] == '{' \
                                    else ''

                        if val != '': define_info['value'] = val
                        if value_type != '': define_info['type'] = value_type

                        # Join up accumulated conditions with &&
                        if conditions: define_info['requires'] = ' && '.join(sum(conditions, []))

                        # If the comment_buff is not empty, add the comment to the info
                        if comment_buff:
                            full_comment = '\n'.join(comment_buff)

                            # An EOL comment will be added later
                            # The handling could go here instead of above
                            if state == Parse.EOL_COMMENT:
                                define_info['comment'] = ''
                            else:
                                define_info['comment'] = full_comment
                                comment_buff = []

                            # If the comment specifies units, add that to the info
                            units = re.match(r'^\(([^)]+)\)', full_comment)
                            if units:
                                units = units[1]
                                if units == 's' or units == 'sec': units = 'seconds'
                                define_info['units'] = units

                        # Set the options for the current #define
                        if define_name == "MOTHERBOARD" and boards != '':
                            define_info['options'] = boards
                        elif options_json != '':
                            define_info['options'] = options_json
                            if eol_options: options_json = ''

                        # Create section dict if it doesn't exist yet
                        if section not in sch_out[fk]: sch_out[fk][section] = {}

                        # If define has already been seen...
                        if define_name in sch_out[fk][section]:
                            info = sch_out[fk][section][define_name]
                            if isinstance(info, dict): info = [ info ]  # Convert a single dict into a list
                            info.append(define_info)                    # Add to the list
                        else:
                            # Add the define dict with name as key
                            sch_out[fk][section][define_name] = define_info

                        if state == Parse.EOL_COMMENT:
                            last_added_ref = define_info

    return sch_out

def dump_json(schema:dict, jpath:Path):
    with jpath.open('w') as jfile:
        json.dump(schema, jfile, ensure_ascii=False, indent=2)

def dump_yaml(schema:dict, ypath:Path):
    import yaml
    with ypath.open('w') as yfile:
        yaml.dump(schema, yfile, default_flow_style=False, width=120, indent=2)

def main():
    try:
        schema = extract()
    except Exception as exc:
        print("Error: " + str(exc))
        schema = None

    if schema:

        # Get the first command line argument
        import sys
        if len(sys.argv) > 1:
            arg = sys.argv[1]
        else:
            arg = 'some'

        # JSON schema
        if arg in ['some', 'json', 'jsons']:
            print("Generating JSON ...")
            dump_json(schema, Path('schema.json'))

        # JSON schema (wildcard names)
        if arg in ['group', 'jsons']:
            group_options(schema)
            dump_json(schema, Path('schema_grouped.json'))

        # YAML
        if arg in ['some', 'yml', 'yaml']:
            try:
                import yaml
            except ImportError:
                print("Installing YAML module ...")
                import subprocess
                try:
                    subprocess.run(['python3', '-m', 'pip', 'install', 'pyyaml'])
                    import yaml
                except:
                    print("Failed to install YAML module")
                    return

            print("Generating YML ...")
            dump_yaml(schema, Path('schema.yml'))

if __name__ == '__main__':
    main()