#!/usr/bin/env python3

import datetime
import glob
import os
import re
import sys

import requests
import semver


def release():
    major_version = 4

    gitlab_project_id = os.environ["CI_PROJECT_ID"]
    api_token = os.environ["CISCRIPT_API_TOKEN"]
    minor_version = os.environ["MINOR_VERSION"]
    if minor_version == "minor":
        minor_version = None
    else:
        try:
            minor_version = int(minor_version)
        except ValueError:
            sys.exit(f"minor version must be number but is '{minor_version}'")
    patch_version = os.environ["PATCH_VERSION"]
    if patch_version == "patch":
        patch_version = None
    else:
        try:
            patch_version = int(patch_version)
        except ValueError:
            sys.exit(f"patch version must be number but is '{patch_version}'")

    branch = os.environ["CI_COMMIT_BRANCH"]
    print(f"branch '{branch}'")
    if branch == "master":
        if minor_version is None:
            sys.exit("minor version must be set")
        if patch_version is None:
            patch_version = 0
        future_version = f"{major_version}.{minor_version}.{patch_version}"
        response = requests.get(
            (
                f"https://gitlab.princip.cz/"
                f"api/v4/projects/{gitlab_project_id}/repository/tags"
            ),
            headers={"PRIVATE-TOKEN": api_token},
            params={"search": "^v"},
        )
        for tag_dict in response.json():
            tag_name = tag_dict["name"]
            if (re.match(r"^v\d+\.\d+\.\d+$", tag_name)
                    and semver.compare(future_version, tag_name[1:]) < 1):
                sys.exit(
                    f"existing version '{tag_name[1:]}' "
                    f"is greater than or equal to future version "
                    f"'{future_version}'"
                )
    elif match := re.match(r"^stable-(\d+)\.(\d+)$", branch):
        if patch_version is None:
            sys.exit("patch version must be set")
        major_version = int(match.group(1))
        branch_minor_version = int(match.group(2))
        if minor_version is None:
            minor_version = branch_minor_version
        elif minor_version != branch_minor_version:
            sys.exit(
                f"minor version on branch '{branch}' "
                f"must be '{branch_minor_version}' or blank (default)"
            )
        future_version = f"{major_version}.{minor_version}.{patch_version}"
        response = requests.get(
            (
                f"https://gitlab.princip.cz/"
                f"api/v4/projects/{gitlab_project_id}/repository/tags"
            ),
            headers={"PRIVATE-TOKEN": api_token},
            params={"search": f"^v{major_version}.{minor_version}"},
        )
        for tag_dict in response.json():
            tag_name = tag_dict["name"]
            if semver.compare(future_version, tag_name[1:]) < 1:
                sys.exit(
                    f"existing version '{tag_name[1:]}' "
                    f"is greater than or equal to future version "
                    f"'{future_version}'"
                )
    else:
        sys.exit(f"release on branch '{branch}' is forbidden")
    print(f"future version '{future_version}'")
    future_tag_name = f"v{future_version}"
    print(f"future tag name '{future_tag_name}'")

    response = requests.get(
        (
            f"https://gitlab.princip.cz/"
            f"api/v4/projects/{gitlab_project_id}/repository/tags"
            f"/{future_tag_name}"
        ),
        headers={"PRIVATE-TOKEN": api_token},
    )
    if response.status_code != 404:
        sys.exit(f"tag '{future_tag_name}' already exists")

    commit_message = f"update files for {future_version}"
    payload_dict = {
        "branch": branch, "commit_message": commit_message, "actions": []}
    today_date = datetime.datetime.today().strftime("%Y-%m-%d")
    release_description = f"## {future_version} ({today_date})\n"
    change_file_fps = glob.glob(os.path.join("incoming_changes", "*.md"))
    if not change_file_fps:
        sys.exit("no change file")
    for change_file_fp in change_file_fps:
        change_file_fn = os.path.basename(change_file_fp)
        match = re.match(r"^(\d+)-\S+.md$", change_file_fn)
        if match:
            issue_no = match.group(1)
        else:
            issue_no = None
        with open(change_file_fp, "r") as change_file:
            for line in change_file:
                line = line.strip()
                if issue_no:
                    line += f" #{issue_no}"
                release_description += f"{line}\n"
        payload_dict["actions"].append(
            {"action": "delete", "file_path": change_file_fp})
    with open("CHANGELOG.md", "r+") as changelog_file:
        content = changelog_file.read()
        new_changelog_content = f"{release_description}\n\n{content}"
        payload_dict["actions"].append({
            "action": "update",
            "file_path": "CHANGELOG.md",
            "content": new_changelog_content,
        })
    print("CHANGELOG.md updated")

    response = requests.post(
        (
            f"https://gitlab.princip.cz/"
            f"api/v4/projects/{gitlab_project_id}/repository/commits"
        ),
        headers={"PRIVATE-TOKEN": api_token},
        json=payload_dict,
    )
    if response.status_code == 201:
        print(f"commit '{commit_message}' created")
    else:
        sys.exit(
            f"error creating commit '{commit_message}', "
            f"status code '{response.status_code}', json '{response.json()}'"
        )

    response = requests.post(
        (
            f"https://gitlab.princip.cz/"
            f"api/v4/projects/{gitlab_project_id}/repository/tags"
        ),
        headers={"PRIVATE-TOKEN": api_token},
        params={"tag_name": future_tag_name, "ref": branch},
    )
    if response.status_code == 201:
        print(f"tag '{future_tag_name}' created")
    else:
        sys.exit(
            f"error creating tag '{future_tag_name}', "
            f"status code '{response.status_code}', "
            f"json '{response.json()}'"
        )


if __name__ == "__main__":
    release()