#!/usr/bin/env python3
from pathlib import Path
from yaml import safe_load

def files(p):
    for i in p:
        if i.is_file():
            yield i


class Patchwork(dict):
    patches_path = None
    patchwork_path = None
    def __init__(self, *arkg, **kwargs):
        self.patches_path = Path(kwargs.pop("patches_path"))
        self.patchwork_path = Path(kwargs.pop("patchwork_path"))
        super().__init__(*arkg, **kwargs)
    patchwork_mkdir = 'mkdir -p {}/{}'
    def prerequisites(self, vanilla_path):
        for i in self.values():
            yield self.patches_path/i
        for i in self.keys():
            yield vanilla_path/i
    def targets(self):
        for i in self.keys():
            yield self.patchwork_path/i
    def action_generator(self, key, value, vanilla_path):
        yield f"mkdir -p {self.patchwork_path}/{Path(key).parent}"
        yield f"patch -u --binary -N -o '{self.patchwork_path}/{key}' "\
              f"'{vanilla_path}/{key}' '{self.patches_path}/{value}'"
    def actions(self, vanilla_path):
        for k, v in self.items():
            yield from self.action_generator(k, v, vanilla_path)
    def tasks(self, vanilla_path):
        for k, v in self.items():
            yield (
                [ self.patches_path/v, vanilla_path/k ],  # src ( patch file, orig file )
                [ self.patchwork_path/k ],  #dst ( patched file )
                [ 
                    f"mkdir -p {self.patchwork_path}/{Path(k).parent}",
                    f"patch -u --binary -N -o '{self.patchwork_path}/{k}' "\
                    f"'{vanilla_path}/{k}' '{self.patches_path}/{v}'"
                ]  # action ( mkdir, patch )
            )


mod_name = 'randchgs'
mod_install_path = 'C:/Users/User/Documents/Paradox Interactive/Hearts of Iron IV/mod/randchgs'
dir_vanilla = Path("../vanilla/v1.13.4")
dir_image = Path('build/image')
dir_modimage = Path(f"{dir_image}/{mod_name}")
dir_src_raw = Path('src/raw')
dir_src_raw_files = list(files(Path(dir_src_raw).rglob("*")))
dir_patches_path = Path('src/patches')
dir_patchwork_path = Path('build/patched')
patchwork = Patchwork({
    'map/definition.csv': 'map_definition.patch',
    'history/countries/ISR - Israel.txt': 'history_countries_ISR.patch',
    #  'history/states/728-Guangzhouwan.txt' : 'history_states_728.patch',
}, patches_path = dir_patches_path, patchwork_path = dir_patchwork_path )
patchwork_scripted_template_input_file = dir_patches_path/'extrapoint.yaml'
with open(patchwork_scripted_template_input_file) as s:
   patchwork_scripted_template_input_data = safe_load(s)

dir_image_files = [ f"{dir_modimage}/{f.relative_to(dir_src_raw)}" for f in dir_src_raw_files ] + \
                  [ f"{dir_modimage}/{f.relative_to(patchwork.patchwork_path)}" for f in patchwork.targets() ]

DOIT_CONFIG = {
        'default_tasks': ['build'],
        'action_string_formatting': 'both'
}

def history_states_path(state_id):
    history_state_file = next((Path(dir_vanilla)/'history'/'states').glob(f"{state_id}*"))
    return {
        'src' : history_state_file,
        'dest': Path(dir_patchwork_path)/history_state_file.relative_to(dir_vanilla)
    }

def task_patch_history_states_scripted():
    def history_state_patch(task, provinces):
        source = Path(next(iter(task.file_dep)))
        target = Path(task.targets[0])
        target.parent.mkdir(parents=True, exist_ok=True)
        seen_history = False
        wrote_history = False
        with source.open(newline='') as infile:
            with target.open('w') as outfile:
                for line_in in infile:
                    outfile.write(line_in)
                    seen_history = seen_history or ( 'history' in line_in )
                    if not wrote_history and seen_history and '{' in line_in:
                        for province_id, province_info in provinces.items():
                            outfile.write(
                                 "\t\tvictory_points = {\n"\
                                f"\t\t\t{province_id} {province_info['points']}\n"\
                                 "\t\t}\n"\
                            )
                        wrote_history = True
        target.touch()
    for state_id, state_data in patchwork_scripted_template_input_data.items(): 
        files = history_states_path(state_id)
        yield {
            'name'     : f"{state_id}",
            'file_dep' : [ files['src'] ],
            'targets'  : [ files['dest'] ],
            'actions'  : [ ( history_state_patch, [], {'provinces' : state_data}) ],
            'clean'    : True
        }

def task_patch():
    for src, dest, patch in patchwork.tasks(dir_vanilla):
        yield {
            'name'     : f"{dest[0]}",
            'file_dep' : src,
            'targets'  : dest,
            'actions'  : patch,
            'clean'    : True
        }

def task_image():
    filelist = dir_src_raw_files + list(patchwork.targets())
    
    return {
        'file_dep' : filelist + 
                     [ history_states_path(state_id)['dest'] 
                       for state_id in patchwork_scripted_template_input_data.keys() ],
        'targets'  : dir_image_files,
        'actions'  : [f"mkdir -p {dir_modimage}",
                      f"rsync -rv {dir_src_raw}/ {patchwork.patchwork_path}/"\
                      f" {dir_modimage}/" ],
        'clean'    : True
    }

def task_image_mod():
    dep = 'src/raw/descriptor.mod'
    def prepare_modname_mod(task):
        source = Path(next(iter(task.file_dep)))
        target = Path(task.targets[0])
        target.parent.mkdir(parents=True, exist_ok=True)
        with source.open() as s:
            with target.open('w') as o:
                o.write(s.read())
                o.write(f"path=\"{mod_install_path}\"")
    return {
        'file_dep' : [ dep ],
        'targets'  : [f"{dir_image}/{mod_name}.mod" ],
        'actions'  : [ prepare_modname_mod ],
        'clean'    : True
    }

def task_build():
    return {
        'task_dep' : [ 'image' ],
        'file_dep' : [f"{dir_image}/{mod_name}.mod" ] + dir_image_files,
        'targets'  : [f"{dir_image}/{mod_name}.zip" ],
        'actions'  : [f"cd {dir_image} && zip -r {mod_name}.zip {mod_name}",
                      f"cd {dir_image} && zip -r {mod_name}.zip {mod_name}.mod" ],
        'clean'    : True
    }

def task_purge_build():
    return {
        'actions'  : [ 'rm -rf build' ]
    }