# Copyright 2004-2011 Tom Rothamel <pytom@bishoujo.us>
#
# Permission is hereby granted, free of charge, to any person
# obtaining a copy of this software and associated documentation files
# (the "Software"), to deal in the Software without restriction,
# including without limitation the rights to use, copy, modify, merge,
# publish, distribute, sublicense, and/or sell copies of the Software,
# and to permit persons to whom the Software is furnished to do so,
# subject to the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

import renpy
import codecs
import time
import re

image_prefixes = None

# Things to check in lint.
#
# Image files exist, and are of the right case.
# Jump/Call targets defined.
# Say whos can evaluate.
# Call followed by say.
# Show/Scene valid.
# At valid.
# With valid.
# Hide maybe valid.
# Expressions can compile.

# The node the report will be about:
report_node = None

# Reports a message to the user.
def report(msg, *args):
    if report_node:
        out = u"%s:%d " % (renpy.parser.unicode_filename(report_node.filename), report_node.linenumber)     
    else:
        out = ""
        
    out += msg % args
    print
    print out.encode('utf-8')

added = { }

# Reports additional information about a message, the first time it
# occurs.
def add(msg):
    if not msg in added:
        added[msg] = True    
        print unicode(msg).encode('utf-8')


# Trys to evaluate an expression, announcing an error if it fails.
def try_eval(where, expr, additional=None):

    # Make sure the expression compiles.
    try_compile(where, expr)

    # Simply look up the first component of the python expression, and
    # see if it exists in the store.
    m = re.match(r'\s*([a-zA-Z_]\w*)', expr)

    if not m:
        return
    
    if hasattr(renpy.store, m.group(1)):
        return

    if m.group(1) in __builtins__:
        return

    report( "Could not evaluate '%s', in %s.", expr, where)
    if additional:
        add(additional)

# Returns True of the expression can be compiled as python, False
# otherwise.
def try_compile(where, expr, additional=None):

    try:
        renpy.python.py_compile_eval_bytecode(expr)
    except:
        report("'%s' could not be compiled as a python expression, %s.", expr, where)
        if additional:
            add(additional)
        

# This reports an error if we're sure that the image with the given name
# does not exist.
def image_exists(name, expression, tag):

    # Add the tag to the set of known tags.
    tag = tag or name[0]
    image_prefixes[tag] = True

    if expression:
        return

    name = list(name)
    names = " ".join(name)

    while name:
        if tuple(name) in renpy.exports.images:
            return

        name.pop()

    report("The image named '%s' was not declared.", names)

# Only check each file once.
check_file_cache = { }

def check_file(what, fn):

    present = check_file_cache.get(fn, None)
    if present is True:
        return
    if present is False:
        report("%s uses file '%s', which is not loadable.", what.capitalize(), fn)
        return

    if not renpy.loader.loadable(fn):
        report("%s uses file '%s', which is not loadable.", what.capitalize(), fn)
        check_file_cache[fn] = False
        return

    check_file_cache[fn] = True

    try:
        renpy.loader.transfn(fn)
    except:
        return

    

def check_displayable(what, d):

    def predict_image(img):
        files.extend(img.predict_files())

    renpy.display.predict.image = predict_image
        
    files = [ ]

    if isinstance(d, renpy.display.core.Displayable):
        d.visit_all(lambda a : a.predict_one())

    for fn in files:
        check_file(what, fn)
    
        
# Lints ast.Image nodes.
def check_image(node):

    name = " ".join(node.imgname)
    
    check_displayable('image %s' % name, renpy.exports.images[node.imgname])

def imspec(t):
    if len(t) == 3:
        return t[0], None, None, t[1], t[2], 0
    if len(t) == 6:
        return t[0], t[1], t[2], t[3], t[4], t[5], None
    else:
        return t


# Lints ast.Show and ast.Scene nodets.
def check_show(node):

    # A Scene may have an empty imspec.
    if not node.imspec:
        return

    name, expression, tag, at_list, layer, zorder, behind = imspec(node.imspec)

    if layer not in renpy.config.layers and layer not in renpy.config.top_layers:
        report("Uses layer '%s', which is not in config.layers.", layer)

    image_exists(name, expression, tag)

    for i in at_list:
        try_eval("the at list of a scene or show statment", i, "Perhaps you forgot to declare, or misspelled, a position?")
        

# Lints ast.Hide.

def check_hide(node):

    name, expression, tag, at_list, layer, zorder, behind = imspec(node.imspec)

    tag = tag or name[0]

    if layer not in renpy.config.layers and layer not in renpy.config.top_layers:
        report("Uses layer '%s', which is not in config.layers.", layer)

    if tag not in image_prefixes:
        report("The image tag '%s' is not the prefix of a declared image, nor was it used in a show statement before this hide statement.", tag)

    # for i in at_list:
    #    try_eval(node, "at list of hide statment", i)
        
def check_with(node):
    try_eval("a with statement or clause", node.expr, "Perhaps you forgot to declare, or misspelled, a transition?")

def check_user(node):

    def error(msg):
        report("%s", msg)

    renpy.exports.push_error_handler(error)
    try:
        node.call("lint")
    finally:
        renpy.exports.pop_error_handler()

    try:
        node.get_next()
    except:
        report("Didn't properly report what the next statement should be.")

check_text_tags = renpy.display.text.check_text_tags
        
def text_checks(s):
    msg = renpy.display.text.check_text_tags(s)
    if msg:
        report("%s (in %s)", msg, repr(s)[1:])

    if "%" in s:
        
        state = 0
        pos = 0
        fmt = ""
        while pos < len(s):            
            c = s[pos]
            pos += 1

            # Not in a format.
            if state == 0:
                if c == "%":
                    state = 1
                    fmt = "%"
                    
            # In a format.
            elif state == 1:
                fmt += c
                if c == "(":
                    state = 2
                elif c in "#0123456780- +hlL":
                    state = 1
                elif c in "diouxXeEfFgGcrs%":
                    state = 0
                else:
                    report("Unknown string format code '%s' (in %s)", fmt, repr(s)[1:])
                    state = 0
                    
            # In a mapping key.
            elif state == 2:
                fmt += c
                if c == ")":
                    state = 1

        if state != 0:
            report("Unterminated string format code '%s' (in %s)", fmt, repr(s)[1:])
        
def check_say(node):

    if node.who:
        try_eval("the who part of a say statement", node.who, "Perhaps you forgot to declare a character?")
        
    if node.with_:
        try_eval("the with clause of a say statement", node.with_, "Perhaps you forgot to declare, or misspelled, a transition?")

    text_checks(node.what)
        
def check_menu(node):

    if node.with_:
        try_eval("the with clause of a menu statement", node.with_, "Perhaps you forgot to declare, or misspelled, a transition?")

    if not [ (l, c, b) for l, c, b in node.items if b ]:
        report("The menu does not contain any selectable choices.")

    for l, c, b in node.items:
        if c:
            try_compile("in the if clause of a menuitem", c)

        text_checks(l)

def check_jump(node):

    if node.expression:
        return

    if not renpy.game.script.has_label(node.target):
        report("The jump is to nonexistent label '%s'.", node.target)

def check_call(node):

#     if not isinstance(node.next.name, basestring):
#         report(node, "The call does not have a from clause associated with it.")
#         add("You can add from clauses to calls automatically by running the add_from program.")
#         add("This is necessary to ensure saves can be loaded even when the script changes.")

    if node.expression:
        return

    if not renpy.game.script.has_label(node.label):
        report("The call is to nonexistent label '%s'.", node.label)

def check_while(node):
    try_compile("in the condition of the while statement", node.condition)

def check_if(node):

    for condition, block in node.entries:
        try_compile("in a condition of the if statement", condition)

def check_style(name, s):

    if s.indexed:
        for i in s.indexed:
            check_style(name + "[%r]" % (name,), s.indexed[i])

    for p in s.properties:
        for k, v in p.iteritems():

            kname = name + "." + k
            
            # Treat font specially.
            if k.endswith("font"):
                check_file(name, v)

            e = renpy.style.expansions[k]

            # We only need to check the first function.
            for prio, propn, func in e:
                if func:
                    v = func(v)
                break
                
            if isinstance(v, renpy.display.core.Displayable):
                check_displayable(kname, v) 

def check_label(node):

    def add_arg(n):
        if n is None:
            return

        if not hasattr(renpy.store, n):
            setattr(renpy.store, n, None)
            
    pi = node.parameters

    if pi is not None:
    
        for i in pi.positional:
            add_arg(i)
        add_arg(pi.extrapos)
        add_arg(pi.extrakw)
                

def check_styles():
    for name, s in renpy.style.style_map.iteritems():
        check_style("Style property style." + name, s)

def humanize(n):
    s = str(n)

    rv = []

    for i, c in enumerate(reversed(s)):
        if i and not (i % 3):
            rv.insert(0, ',')

        rv.insert(0, c)

    return ''.join(rv)

        
def lint():
    """
    The master lint function, that's responsible for staging all of the
    other checks.
    """
    
    renpy.game.lint = True
    
    print codecs.BOM_UTF8
    print unicode(renpy.version + " lint report, generated at: " + time.ctime()).encode("utf-8")

    # This supports check_hide.
    global image_prefixes
    image_prefixes = { }

    for k in renpy.exports.images:
        image_prefixes[k[0]] = True

    # Iterate through every statement in the program, processing
    # them. We sort them in filename, linenumber order.
    
    all_stmts = [ (i.filename, i.linenumber, i) for i in renpy.game.script.all_stmts ]
    all_stmts.sort()

    say_words = 0
    say_count = 0
    menu_count = 0

    global report_node
    
    for fn, ln, node in all_stmts:

        report_node = node
        
        if isinstance(node, renpy.ast.Image):
            check_image(node)

        elif isinstance(node, renpy.ast.Show):
            check_show(node)
    
        elif isinstance(node, renpy.ast.Scene):
            check_show(node)

        elif isinstance(node, renpy.ast.Hide):
            check_hide(node)

        elif isinstance(node, renpy.ast.With):
            check_with(node)

        elif isinstance(node, renpy.ast.Say):
            check_say(node)
            say_count += 1
            say_words += len(node.what.split())
    
        elif isinstance(node, renpy.ast.Menu):
            check_menu(node)
            menu_count += 1

        elif isinstance(node, renpy.ast.Jump):
            check_jump(node)

        elif isinstance(node, renpy.ast.Call):
            check_call(node)

        elif isinstance(node, renpy.ast.While):
            check_while(node)

        elif isinstance(node, renpy.ast.If):
            check_if(node)

        elif isinstance(node, renpy.ast.UserStatement):
            check_user(node)

        elif isinstance(node, renpy.ast.Label):
            check_label(node)
            
    report_node = None
            
    check_styles()
            
    for f in renpy.config.lint_hooks:
        f()

    print
    print
    print "Statistics:"
    print
    print "The game contains", humanize(say_count), "screens of dialogue."
    print "These screens contain a total of", humanize(say_words), "words,"
    if say_count > 0:
        print "for an average of %.1f words per screen." % (1.0 * say_words / say_count) 
    print "The game contains", humanize(menu_count), "menus."
    print

    if renpy.config.developer:
        print "Remember to set config.developer to False before releasing."
        print
        
    print "Lint is not a substitute for thorough testing. Remember to update Ren'Py"
    print "before releasing. New releases fix bugs and improve compatibility."
