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#      http://www.apache.org/licenses/LICENSE-2.0
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import abc
import logging


class FlinkJiraRule:
    __metaclass__ = abc.ABCMeta

    def __init__(self, jira_client, config, is_dry_run):
        self.jira_client = jira_client
        self.is_dry_run = is_dry_run
        self.stale_days = config["stale_days"].get()
        self.warning_days = config["warning_days"].get()
        self.warning_label = config["warning_label"].get()
        self.done_label = config["done_label"].get()
        self.done_comment = config["done_comment"].get()
        self.warning_comment = config["warning_comment"].get()

    def get_issues(self, jql_query):
        """Queries the JIRA PI for all issues that match the given JQL Query

        This method is necessary as requests tend to time out if the number of results reaches a certain number.
        So, this method requests the results in multiple queries and returns a final list of all issues.
        :param jql_query: the search query
        :return: a list of issues matching the query
        """
        limit = 200
        current = 0
        total = 1
        issues = []
        while current < total:
            response = self.jira_client.jql(jql_query, limit=limit, start=current)
            total = response["total"]
            issues = issues + response["issues"]
            current = len(issues)
        logging.info(f'"{jql_query}" returned {len(issues)} issues')
        return issues

    def has_recently_updated_subtask(self, parent, updated_within_days):
        find_subtasks_updated_within = (
            f"parent = {parent}  AND updated > startOfDay(-{updated_within_days}d)"
        )
        issues = self.get_issues(find_subtasks_updated_within)
        return len(issues) > 0

    def add_label(self, issue, label):
        labels = issue["fields"]["labels"] + [label]
        fields = {"labels": labels}
        key = issue["key"]

        if not self.is_dry_run:
            self.jira_client.update_issue_field(key, fields)
        else:
            logging.info(f'DRY RUN ({key}): Adding label "{label}".')

    def replace_label(self, issue, old_label, new_label):
        labels = issue["fields"]["labels"] + [new_label]
        labels.remove(old_label)
        fields = {"labels": labels}
        key = issue["key"]

        if not self.is_dry_run:
            self.jira_client.update_issue_field(key, fields)
        else:
            logging.info(
                f'DRY RUN ({key}): Replace label "{old_label}" for "{new_label}".'
            )

    def add_comment(self, key, comment):
        if not self.is_dry_run:
            self.jira_client.issue_add_comment(key, comment)
        else:
            logging.info(f'DRY_RUN ({key}): Adding comment "{comment}".')

    def close_issue(self, key):
        if not self.is_dry_run:
            self.jira_client.set_issue_status(
                key, "Closed", fields={"resolution": {"name": "Auto Closed"}}
            )
        else:
            logging.info(f"DRY_RUN (({key})): Closing.")

    def unassign(self, key):
        if not self.is_dry_run:
            self.jira_client.assign_issue(key, None)
        else:
            logging.info(f"DRY_RUN (({key})): Unassigning.")

    def set_priority(self, key, priority):
        if not self.is_dry_run:
            fields = {"priority": {"name": priority}}
            self.jira_client.update_issue_field(key, fields)
        else:
            logging.info(f"DRY_RUN (({key})): Setting to {priority}")

    @abc.abstractmethod
    def run(self):
        return

    @abc.abstractmethod
    def handle_stale_ticket(self, key):
        return

    def mark_stale_tickets_stale(self, jql_query):

        logging.info(f"Looking for stale tickets.")
        issues = self.get_issues(jql_query)

        for issue in issues:
            key = issue["key"]
            issue = self.jira_client.get_issue(key)

            if not self.has_recently_updated_subtask(key, self.stale_days):
                logging.info(
                    f"Found https://issues.apache.org/jira/browse/{key}. It is marked stale now."
                )
                formatted_comment = self.warning_comment.format(
                    stale_days=self.stale_days,
                    warning_days=self.warning_days,
                    warning_label=self.warning_label,
                )

                self.add_label(issue, self.warning_label)
                self.add_comment(key, formatted_comment)

            else:
                logging.info(
                    f"Found https://issues.apache.org/jira/browse/{key}, but is has recently updated Subtasks. "
                    f"Ignoring for now."
                )

    def handle_tickets_marked_stale(self, jql_query):
        logging.info(f"Looking for ticket previously marked as {self.warning_label}.")
        issues = self.get_issues(jql_query)

        for issue in issues:
            key = issue["key"]
            logging.info(
                f"Found https://issues.apache.org/jira/browse/{key}. It is now processed as stale."
            )

            formatted_comment = self.done_comment.format(
                warning_days=self.warning_days,
                warning_label=self.warning_label,
                done_label=self.done_label,
            )

            self.add_comment(key, formatted_comment)
            self.replace_label(issue, self.warning_label, self.done_label)
            self.handle_stale_ticket(key)