import argparse
import sys
import os
import json
import uuid
import subprocess
import bpy
from pathlib import Path
from asset_library.common.functions import create_catalog_file
from asset_library.common.file_utils import get_last_files
from asset_library.constants import ASSETLIB_FILENAME


"""
### Create asset collection

## create_collection_library: generate all category blend from json
## if source_directory is set, call create_collection_json

##    # create_collection_json:
##    # scan marked blend, create json and call create_catalog_file

##         # create_catalog_file
##         # create catalog file from json file

###  Json Structure 
[
    {
    'name': 'chars/main',
    'id': '013562-56315-4563156-123',
    'children':
            [
                {
                'filepath' : '/z/...',
                'name' : 'collection name',
                'tags' : ['variation', 'machin', 'chose'],
                'metadata' : {'filepath': '$PROJECT/...', 'version' : 'mushable'}
                },
                {
                'filepath' : '/z/...',
                },
            ],
    },
] 
"""


def create_collection_json(path, source_directory):
    """Create a Json from every marked collection in blends
    contained in folderpath (respect hierachy)
    """

    json_path = Path(path) / ASSETLIB_FILENAME

    # scan all last version of the assets ?
    # get last version files ?
    # or open all blends and look only for marked collection ? (if versionned, get still get only last)

    # get all blend in dir and subdirs (only last when versionned _v???)
    blends = get_last_files(
        source_directory, pattern=r"(_v\d{3})?\.blend$", only_matching=True
    )

    root_path = Path(source_directory).as_posix().rstrip("/") + "/"
    print("root_path: ", root_path)
    # open and check data block marked as asset

    category_datas = []
    for i, blend in enumerate(blends):
        fp = Path(blend)
        print(f"{i+1}/{len(blends)}")

        ## What is considered a grouping category ? top level folders ? parents[1] ?

        ## Remove root path and extension
        ## top level folder ('chars'), problem if blends at root
        category = fp.as_posix().replace(root_path, "").split("/")[0]

        ## full blend path (chars/perso/perso)
        # category = fp.as_posix().replace(root_path, '').rsplit('.', 1)[0]

        print(category)

        with bpy.data.libraries.load(blend, link=True, assets_only=True) as (
            data_from,
            data_to,
        ):
            ## just listing
            col_name_list = [c for c in data_from.collections]

        if not col_name_list:
            continue

        col_list = next(
            (c["children"] for c in category_datas if c["name"] == category), None
        )
        if col_list is None:
            col_list = []
            category_data = {
                "name": category,
                "id": str(uuid.uuid4()),
                "children": col_list,
            }
            category_datas.append(category_data)

        blend_source_path = blend.as_posix()
        if project_root := os.environ.get("PROJECT_ROOT"):
            blend_source_path = blend_source_path.replace(project_root, "$PROJECT_ROOT")

        for name in col_name_list:
            data = {
                "filepath": blend,
                "name": name,
                # 'tags' : [],
                "metadata": {"filepath": blend_source_path},
            }

            col_list.append(data)

    json_path.write_text(json.dumps(category_datas, indent="\t"))
    ## create text catalog from json (keep_existing_category ?)
    create_catalog_file(json_path, keep_existing_category=True)


def create_collection_library(path, source_directory=None):
    """
    path: store collection library (json and blends database)
    source_directory: if a source is set, rebuild json and library
    """

    if source_directory:
        if not Path(source_directory).exists():
            print(f"Source directory not exists: {source_directory}")
            return

        ## scan source and build json in assetlib dir root
        create_collection_json(path, source_directory)

    json_path = Path(path) / ASSETLIB_FILENAME
    if not json_path.exists():
        print(f"No json found at: {json_path}")
        return

    file_datas = json.loads(json_path.read())

    ## For each category in json, execute build_assets_blend script
    script = Path(__file__).parent / "build_collection_blends.py"
    # empty_blend = Path(__file__).parent / 'empty_scene.blend'

    # for category, asset_datas in file_datas.items():
    for category_data in file_datas:
        ## add an empty blend as second arg
        cmd = [
            bpy.app.binary_path,
            "--python",
            str(script),
            "--",
            "--path",
            path,
            "--category",
            category_data["name"],
        ]
        print("cmd: ", cmd)
        subprocess.call(cmd)


if __name__ == "__main__":
    parser = argparse.ArgumentParser(
        description="Create Collection Library",
        formatter_class=argparse.ArgumentDefaultsHelpFormatter,
    )

    parser.add_argument(
        "--path"
    )  # trouve/créer le json assetlib.json en sous-dossier de libdir

    if "--" in sys.argv:
        index = sys.argv.index("--")
        sys.argv = [sys.argv[index - 1], *sys.argv[index + 1 :]]

    args = parser.parse_args()
    create_collection_library(**vars(args))