import click
import shutil

from pathlib import Path
from datetime import datetime

from ._natural_sort import natural_sort

DEVELOPER_DRIVE = Path("/mnt/e/")
PATH_ISSUES = DEVELOPER_DRIVE / "Safeguard-MBP-issues"
PATH_WORKBOOKS = DEVELOPER_DRIVE / "Safeguard MBP Workbooks"
PATH_WIN_DESKTOP = Path("/mnt/c/Users/Holgi/Desktop")

TODAY = datetime.now().strftime("%y%m%d")

CRLF = "\r\n"

EXCEL_CHANGELOGS = {
    "changes_hyb_workbook": "J1",
    "changes_qc_cy5_workbook": "J1",
    "changes_qc_dry_workbook": "L1",
    "changes_qc_workbook": "J1",
}

EXCEL_CHANGELOG_HEADERS = [
    "Sheet\tWell\tContents\tComment",
    "-----\t----\t--------\t-------",
    "",
]


def _folder_content(folder):
    nondotted = (i for i in folder.iterdir() if not i.stem.startswith("."))
    return (i for i in nondotted if not i.stem.startswith("~"))


def _files_in_folder(folder, suffix):
    files = (f for f in _folder_content(folder) if f.is_file())
    return (f for f in files if f.suffix == suffix)


def get_latest_version(parent=PATH_ISSUES):
    folders = (i for i in _folder_content(parent) if i.is_dir())
    versions = natural_sort(f.name for f in folders if f.stem.lower().startswith("v"))
    return versions[-1]


def get_next_version(parent=PATH_ISSUES, echo_current=True):
    latest = get_latest_version(parent)
    if echo_current:
        print("current version:", latest)

    try:
        head, tail = latest.rsplit(".", 1)
        next_minor = int(tail) + 1
        next_version = f"{head}.{next_minor}"
    except:
        next_version = ""

    return next_version


def create_new_version_folder(new_version, parent=PATH_ISSUES):
    new_folder_path = parent / new_version
    if new_folder_path.exists():
        print(f"Folder for version {new_version} already exists, aborting")
        return
    new_folder_path.mkdir()
    return new_folder_path


def create_excel_changelogs(new_version, parent):
    for name, cell in EXCEL_CHANGELOGS.items():
        new_file = parent / f"{name}_{new_version}.txt"
        with new_file.open("w") as fh:
            data_line = "\t".join(["Settings", cell, new_version, ""])
            content_lines = EXCEL_CHANGELOG_HEADERS + [data_line, "", ""]
            fh.write(CRLF.join(content_lines))


def create_changelog_entry(new_version, parent=PATH_ISSUES):
    textfiles = _files_in_folder(parent, ".txt")
    changelog = next(f for f in textfiles if f.stem.lower().startswith("change"))
    content = []
    with changelog.open("r") as fh:
        stripped_lines = (line.rstrip() for line in fh)
        for line in stripped_lines:
            content.append(line)
            if line.startswith("----"):
                content.append("")
                content.append(f"{new_version}, work in progress:")
                content.append("    - describe your changes here")
    with changelog.open("w") as fh:
        fh.write(CRLF.join(content))


def copy_changelog(destination, date, latest):
    textfiles = _files_in_folder(PATH_ISSUES, ".txt")
    changelog = next(f for f in textfiles if f.stem.lower().startswith("change"))
    new_path = destination / f"{date}_CHANGELOG_{latest}.txt"
    print(changelog.name, "->", new_path)
    shutil.copyfile(changelog, new_path)


def copy_workbook_changelogs(destination, date, latest):
    source = PATH_ISSUES / latest
    textfiles = _files_in_folder(source, ".txt")
    logs = (f for f in textfiles if f.stem.lower().startswith("change"))
    for log_file in logs:
        parts = log_file.stem.split("_")
        if parts[-1] == latest:
            new_path = destination / f"{date}_{log_file.name}"
        else:
            new_path = destination / f"{date}_{log_file.stem}_{latest}.txt"
        print(log_file.name, "->", new_path)
        shutil.copyfile(log_file, new_path)


def copy_workbooks(destination, date, latest):
    for excel_file in _files_in_folder(PATH_WORKBOOKS, ".xlsx"):
        new_path = destination / f"{date}_{excel_file.stem}_{latest}.xlsx"
        print(excel_file.name, "->", new_path)
        shutil.copyfile(excel_file, new_path)


@click.command()
@click.option(
    "-v",
    "--version",
    required=True,
    prompt="new version",
    default=get_next_version,
    show_default="next minor version",
)
def sg_mbp_new_version(version):
    """
    creates a new version folder, new excel changes files and modifies the overall changelog
    in "E:\Safeguard-MBP-issues"
    """

    folder = create_new_version_folder(version)
    if folder is not None:
        create_excel_changelogs(version, folder)
        create_changelog_entry(version)


@click.command()
def sg_mbp_release():
    """
    Before running this command:

    \b
     - make the requiered edits to the workbooks
     - edit the changelog in "E:\Safeguard-MBP-issues"
     - create a new versions folder in "E:\Safeguard-MBP-issues", e.g. "v3.9.49"
     - note the changes in the excel changelogs in the created version folder

    The command will collect all data into one folder on the Desktop to be published
    """
    latest = get_latest_version()

    new_folder_name = f"{TODAY} {latest}"
    new_folder_path = PATH_WIN_DESKTOP / new_folder_name
    if new_folder_path.exists():
        raise IOError(f"Folder exists on desktop: {new_folder_name}")
    else:
        new_folder_path.mkdir()

    copy_workbooks(new_folder_path, TODAY, latest)
    copy_workbook_changelogs(new_folder_path, TODAY, latest)
    copy_changelog(new_folder_path, TODAY, latest)