from typing import Optional, Any, Dict, List, Text

SUBJECT_WITH_BRANCH_TEMPLATE = u'{repo} / {branch}'
SUBJECT_WITH_PR_OR_ISSUE_INFO_TEMPLATE = u'{repo} / {type} #{id} {title}'

EMPTY_SHA = '0000000000000000000000000000000000000000'

COMMITS_LIMIT = 20
COMMIT_ROW_TEMPLATE = u'* {commit_msg} ([{commit_short_sha}]({commit_url}))\n'
COMMITS_MORE_THAN_LIMIT_TEMPLATE = u"[and {commits_number} more commit(s)]"

PUSH_PUSHED_TEXT_WITH_URL = u"[pushed]({compare_url})"
PUSH_PUSHED_TEXT_WITHOUT_URL = u"pushed"
PUSH_COMMITS_MESSAGE_TEMPLATE = u"""{user_name} {pushed_text} to branch {branch_name}

{commits_data}
"""

FORCE_PUSH_COMMITS_MESSAGE_TEMPLATE = u"{user_name} [force pushed]({url}) to branch {branch_name}. Head is now {head}"
REMOVE_BRANCH_MESSAGE_TEMPLATE = u"{user_name} deleted branch {branch_name}"

PULL_REQUEST_OR_ISSUE_MESSAGE_TEMPLATE = u"{user_name} {action} [{type}{id}]({url})"
PULL_REQUEST_OR_ISSUE_ASSIGNEE_INFO_TEMPLATE = u"(assigned to {assignee})"
PULL_REQUEST_BRANCH_INFO_TEMPLATE = u"\nfrom `{target}` to `{base}`"

CONTENT_MESSAGE_TEMPLATE = u"\n~~~ quote\n{message}\n~~~"

COMMITS_COMMENT_MESSAGE_TEMPLATE = u"{user_name} {action} on [{sha}]({url})"

PUSH_TAGS_MESSAGE_TEMPLATE = u"""{user_name} {action} tag {tag}"""
TAG_WITH_URL_TEMPLATE = u"[{tag_name}]({tag_url})"
TAG_WITHOUT_URL_TEMPLATE = u"{tag_name}"

def get_push_commits_event_message(user_name, compare_url, branch_name, commits_data, is_truncated=False):
    # type: (Text, Optional[Text], Text, List[Dict[str, Any]], Optional[bool]) -> Text
    if compare_url:
        pushed_text_message = PUSH_PUSHED_TEXT_WITH_URL.format(compare_url=compare_url)
    else:
        pushed_text_message = PUSH_PUSHED_TEXT_WITHOUT_URL

    return PUSH_COMMITS_MESSAGE_TEMPLATE.format(
        user_name=user_name,
        pushed_text=pushed_text_message,
        branch_name=branch_name,
        commits_data=get_commits_content(commits_data, is_truncated),
    ).rstrip()

def get_force_push_commits_event_message(user_name, url, branch_name, head):
    # type: (Text, Text, Text, Text) -> Text
    return FORCE_PUSH_COMMITS_MESSAGE_TEMPLATE.format(
        user_name=user_name,
        url=url,
        branch_name=branch_name,
        head=head
    )

def get_remove_branch_event_message(user_name, branch_name):
    # type: (Text, Text) -> Text
    return REMOVE_BRANCH_MESSAGE_TEMPLATE.format(
        user_name=user_name,
        branch_name=branch_name,
    )

def get_pull_request_event_message(
        user_name, action, url, number=None,
        target_branch=None, base_branch=None,
        message=None, assignee=None, type='PR'
):
    # type: (Text, Text, Text, Optional[int], Optional[Text], Optional[Text], Optional[Text], Optional[Text], Optional[Text]) -> Text
    main_message = PULL_REQUEST_OR_ISSUE_MESSAGE_TEMPLATE.format(
        user_name=user_name,
        action=action,
        type=type,
        url=url,
        id=" #{}".format(number) if number is not None else ''
    )
    if assignee:
        main_message += PULL_REQUEST_OR_ISSUE_ASSIGNEE_INFO_TEMPLATE.format(assignee=assignee)

    if target_branch and base_branch:
        main_message += PULL_REQUEST_BRANCH_INFO_TEMPLATE.format(
            target=target_branch,
            base=base_branch
        )
    if message:
        main_message += '\n' + CONTENT_MESSAGE_TEMPLATE.format(message=message)
    return main_message.rstrip()

def get_issue_event_message(user_name, action, url, number=None, message=None, assignee=None):
    # type: (Text, Text, Text, Optional[int], Optional[Text], Optional[Text]) -> Text
    return get_pull_request_event_message(
        user_name,
        action,
        url,
        number,
        message=message,
        assignee=assignee,
        type='Issue'
    )

def get_push_tag_event_message(user_name, tag_name, tag_url=None, action='pushed'):
    # type: (Text, Text, Optional[Text], Optional[Text]) -> Text
    if tag_url:
        tag_part = TAG_WITH_URL_TEMPLATE.format(tag_name=tag_name, tag_url=tag_url)
    else:
        tag_part = TAG_WITHOUT_URL_TEMPLATE.format(tag_name=tag_name)
    return PUSH_TAGS_MESSAGE_TEMPLATE.format(
        user_name=user_name,
        action=action,
        tag=tag_part
    )

def get_commits_comment_action_message(user_name, action, commit_url, sha, message=None):
    # type: (Text, Text, Text, Text, Optional[Text]) -> Text
    content = COMMITS_COMMENT_MESSAGE_TEMPLATE.format(
        user_name=user_name,
        action=action,
        sha=get_short_sha(sha),
        url=commit_url
    )
    if message is not None:
        content += CONTENT_MESSAGE_TEMPLATE.format(
            message=message
        )
    return content

def get_commits_content(commits_data, is_truncated=False):
    # type: (List[Dict[str, Any]], Optional[bool]) -> Text
    commits_content = u''
    for commit in commits_data[:COMMITS_LIMIT]:
        commits_content += COMMIT_ROW_TEMPLATE.format(
            commit_short_sha=get_short_sha(commit.get('sha')),
            commit_url=commit.get('url'),
            commit_msg=commit.get('message').partition('\n')[0]
        )

    if len(commits_data) > COMMITS_LIMIT:
        commits_content += COMMITS_MORE_THAN_LIMIT_TEMPLATE.format(
            commits_number=len(commits_data) - COMMITS_LIMIT
        )
    elif is_truncated:
        commits_content += COMMITS_MORE_THAN_LIMIT_TEMPLATE.format(
            commits_number=''
        ).replace('  ', ' ')
    return commits_content.rstrip()

def get_short_sha(sha):
    # type: (Text) -> Text
    return sha[:7]