import click
import shutil
import pyperclip

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 mbp {version} hyb.txt": "J1",
    "changes mbp {version} hqc.txt": "J1",
    "changes mbp {version} dry-1.txt": "L1",
    "changes mbp {version} dry-2.txt": "L1",
    "changes mbp {version} reg.txt": "J1",
    "changes mbp {version} asqc.txt": "L1",
}

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

WORKBOOKS_MAP = {
    "MBP Hyb.xlsx": "MBP {version} Hyb.xlsx",
    "MBP Reg.xlsx": "MBP {version} Reg.xlsx",
    "MBP HQC.xlsx": "MBP {version} HQC.xlsx",
    "MBP Dry-1.xlsx": "MBP {version} Dry-1.xlsx",
    "MBP Dry-2.xlsx": "MBP {version} Dry-2.xlsx",
    "MBP ASQC.xlsx": "MBP {version} ASQC.xlsx",
}


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 / name.format(version=new_version)
        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("    - The following Workbooks did not have any changes: ASQC, Dry-1, Dry-2, Hyb, HQC, Reg")
    with changelog.open("w") as fh:
        fh.write(CRLF.join(content))

def get_changelog_path():
    textfiles = _files_in_folder(PATH_ISSUES, ".txt")
    return next(f for f in textfiles if f.stem.lower().startswith("change"))

def copy_changelog(destination, build_version):
    changelog = get_changelog_path()
    new_path = destination / f"CHANGELOG {build_version}.txt"
    print(changelog.name, "->", new_path)
    shutil.copyfile(changelog, new_path)


def copy_workbook_changelogs(destination, latest, build_version):
    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:
        new_name = log_file.name.replace(latest, build_version)
        new_path = destination / new_name
        print(log_file.name, "->", new_path)
        shutil.copyfile(log_file, new_path)


def copy_workbooks(destination, build_version):
    all_xls_files = _files_in_folder(PATH_WORKBOOKS, ".xlsx")
    mbp_files = (f for f in all_xls_files if f.name.lower().startswith("mbp"))
    for excel_file in mbp_files:
        new_name = WORKBOOKS_MAP[excel_file.name]
        new_path = destination / new_name.format(version=build_version)
        print(excel_file.name, "->", new_path)
        shutil.copyfile(excel_file, new_path)


def collect_current_frms(build_version):
    all_folders = (f for f in PATH_WORKBOOKS.iterdir() if f.is_dir())
    all_frms = (f for f in all_folders if "frm" in f.name.lower())
    return [f for f in all_frms if f.name.endswith(build_version)]


def copy_frms(destination, build_version):
    all_folders = (f for f in PATH_WORKBOOKS.iterdir() if f.is_dir())
    all_frms = (f for f in all_folders if "frm" in f.name.lower())
    current_frms = collect_current_frms(build_version)
    for folder in current_frms:
        new_path = destination / folder.name
        print(folder.name, "->", new_path)
        shutil.copytree(folder, new_path)


def get_issue_numbers(build_version):
    for path in collect_current_frms(build_version):
        rest, issue_info = path.name.lower().split("issue")
        issue, *rest = issue_info.strip().split()
        yield issue.strip(" ,")


def extract_changes_from_log(build_version):
    issue_numbers = set(get_issue_numbers(build_version))
    changelog = get_changelog_path()
    for line in changelog.read_text().splitlines():
        for issue in issue_numbers:
            if issue in line:
                yield line


def get_announcement_text(dev_version, build_version, new_folder_name):
    if not dev_version:
        return "This is an official release, the message must be hand crafted"
    
    latest = get_latest_version()
    changes = list(extract_changes_from_log(build_version))
    if len(changes) == 1:
        change_msg = "Only one change was introduced:"
    else:
        change_msg = "The changes made:"

    text = [
        f"# New MBP Workbook Version {build_version}",
        "Good News Everyone,",
        f"there is a new MBP workbook version available: {build_version}",
        ( 
            f"As indicated by the letter '{dev_version}' at the end,"
            " this version is intended for Freiburg only."
        ),
        change_msg,
        "\n".join(changes),
        "You can find this version at our Freiburg Shared Drive:",
        (
            "Google Drive / Shared drives / Freiburg / Workbooks / MBP Workbooks /"
            f" {latest} /"
            f" {new_folder_name}"
        ),
        "Cheers,\nHolgi"
    ]
    return "\n\n".join(text)


@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()
@click.option(
    "-d",
    "--dev_version",
    prompt="Dev version i.e. 'c'",
    required=True,
    default="",
)
def sg_mbp_build(dev_version):
    """
    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()
    build_version = f"{latest}{dev_version}"

    new_folder_name = f"{TODAY} {build_version}"
    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, build_version)
    copy_workbook_changelogs(new_folder_path, latest, build_version)
    copy_changelog(new_folder_path, build_version)
    copy_frms(new_folder_path, build_version)

    announcement = get_announcement_text(dev_version, build_version, new_folder_name)
    pyperclip.copy(announcement)
    print(announcement)