#!/usr/bin/env python3
"""
Ensure all open issues are tracked in the Backlog project in the Pending Review
column and all open pull requests are tracked in the Active Sprint project in
the Code Review column.
"""

# Standard library
import argparse
import sys
import textwrap
import traceback
from pprint import pprint  # DEBUG

# Third-party
import yaml
from pygments import highlight
from pygments.formatters import TerminalFormatter
from pygments.lexers import PythonTracebackLexer

# First-party/Local
import ccos.log
from ccos import ScriptError, gh_utils

LOG = ccos.log.setup_logger()
PROJECTS_YAML = "ccos/manage/projects.yml"


def setup():
    """Instantiate and configure argparse and logging.

    Return argsparse namespace.
    """
    ap = argparse.ArgumentParser(description=__doc__)
    ap.add_argument(
        "-c",
        "--count",
        default=-1,
        type=int,
        help="only update specified number of issues and pull requests (COUNT"
        " of 3 may result in 6 updates)",
    )
    ap.add_argument(
        "-n",
        "--dryrun",
        action="store_true",
        help="dry run: do not make any changes",
    )
    args = ap.parse_args()
    return args


def read_project_data():
    LOG.info("Reading project data YAML file")
    with open(PROJECTS_YAML, "r") as file_obj:
        project_data = yaml.safe_load(file_obj)
    return project_data


def update_project_data(github_gql_client, project_data):
    LOG.info("Updating project data from GitHub GraphQL API")
    query = gh_utils.gql_query(
        """
        query {
            organization(login:"creativecommons") {
                projectsV2(first: 100) {
                    edges {
                        node {
                            id
                            number
                            title
                            field(name: "Status") {
                                __typename
                                ... on ProjectV2SingleSelectField {
                                    id
                                    name
                                    opt_triage: options(names: "Triage") {
                                        id
                                    }
                                    opt_in_review: options(
                                        names: "In review"
                                    ) {
                                        id
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }
        """
    )
    result = github_gql_client.execute(query)
    for edge in result["organization"]["projectsV2"]["edges"]:
        title = edge["node"]["title"]
        if title in project_data.keys():
            project_data[title]["id"] = edge["node"]["id"]
            project_data[title]["number"] = edge["node"]["number"]
            project_data[title]["status_field_id"] = edge["node"]["field"][
                "id"
            ]
            project_data[title]["status_option_triage_id"] = edge["node"][
                "field"
            ]["opt_triage"][0]["id"]
            project_data[title]["status_option_in_review_id"] = edge["node"][
                "field"
            ]["opt_in_review"][0]["id"]
    return project_data


def get_untracked_items(github_gql_client):
    LOG.info("Searching for untracked open issues and/or pull requests")
    # https://docs.github.com/en/search-github/searching-on-github/searching-issues-and-pull-requests
    search_query = (
        "org:creativecommons"
        " state:open"
        " -project:creativecommons/15"  # Applications project
        " -project:creativecommons/22"  # Systems project
        " -project:creativecommons/23"  # WebDev project
    )
    cursor = ""
    edges = []
    next_page = True
    while next_page is True:
        query = gh_utils.gql_query(
            """
            query($cursor: String, $search_query: String!) {
                search(
                    after: $cursor
                    first: 100
                    query: $search_query
                    type: ISSUE
                ) {
                    edges {
                        node {
                            __typename
                            ... on Issue {
                                createdAt
                                id
                                number
                                repository {
                                    name
                                }
                            }
                            ... on PullRequest {
                                createdAt
                                id
                                number
                                repository {
                                    name
                                }
                            }
                        }
                    }
                    pageInfo{
                        endCursor
                        hasNextPage
                    }
                }
            }
            """
        )
        params = {"cursor": cursor, "search_query": search_query}
        result = github_gql_client.execute(query, variable_values=params)
        edges += result["search"]["edges"]
        cursor = result["search"]["pageInfo"]["endCursor"]
        next_page = result["search"]["pageInfo"]["hasNextPage"]
    items = {"issues": [], "prs": []}
    for edge in edges:
        created = edge["node"]["createdAt"]
        id_ = edge["node"]["id"]
        number = edge["node"]["number"]
        repo = edge["node"]["repository"]["name"]
        type_ = edge["node"]["__typename"]
        if type_ == "Issue":
            items["issues"].append([repo, number, created, id_])
        elif type_ == "PullRequest":
            items["prs"].append([repo, number, created, id_])
    items["issues"].sort()
    items["prs"].sort()
    LOG.info(
        f"Found {len(items['issues']) + len(items['prs'])} open and untracked"
        f" items: {len(items['issues'])} issues, {len(items['prs'])} pull"
        " requests"
    )
    return items


def track_items(args, github_gql_client, project_data, items):
    if not items:
        LOG.info(
            "No untracked open issues and/or pull requests, no action"
            " necessary :)"
        )
        return
    if args.dryrun:
        noop = "dryrun (no-op): "
    else:
        noop = ""

    query_add_item_to_project = gh_utils.gql(
        """
        mutation($project_id: ID!, $issue_id: ID!) {
            addProjectV2ItemById(
                input: {
                    projectId: $project_id
                    contentId: $issue_id
                }
            ) {
                item {
                    id
                }
            }
        }
        """
    )
    query_set_status_option = gh_utils.gql(
        """
        mutation(
            $field_id: ID!
            $item_id: ID!
            $project_id: ID!
            $option_id: String
        ) {
            updateProjectV2ItemFieldValue(
                input: {
                    fieldId: $field_id
                    itemId: $item_id
                    projectId: $project_id
                    value: {
                        singleSelectOptionId: $option_id
                    }
                }
            ) {
                projectV2Item {
                    id
                }
            }
        }
        """
    )

    # Add issues to projects
    if args.count == -1:
        count = len(items["issues"])
    else:
        count = args.count
    LOG.info(f"{noop}Adding {count} open and untracked issues to projects")
    for item in items["issues"][0 : args.count]:  # noqa: E203
        repo, number, _, node_id = item
        # identify appropriate project
        for project in project_data.keys():
            if repo in project_data[project]["repos"]:
                project_id = project_data[project]["id"]
                field_id = project_data[project]["status_field_id"]
                break
        # add item to project
        if not args.dryrun:
            params = {"project_id": project_id, "issue_id": node_id}
            result = github_gql_client.execute(
                query_add_item_to_project, variable_values=params
            )
            item_id = result["addProjectV2ItemById"]["item"]["id"]
            LOG.change_indent(+1)
            LOG.info(f"{repo}#{number} added to {project} project")
        # move item to Status: Triage
        if not args.dryrun:
            params = {
                "field_id": field_id,
                "item_id": item_id,
                "project_id": project_id,
                "option_id": project_data[project]["status_option_triage_id"],
            }
            result = github_gql_client.execute(
                query_set_status_option, variable_values=params
            )
            LOG.info(f"{repo}#{number} moved to Status: Triage")
        LOG.change_indent(-1)
    return  # DEBUG

    # Add pull requests to projects
    if args.count == -1:
        count = len(items["issues"])
    else:
        count = args.count
    LOG.info(
        f"{noop}Adding {count} open and untracked pull requests to projects"
    )
    for pr in items["prs"][0 : args.count]:  # noqa: E203
        print(pr)
    return


def main():
    args = setup()

    github_gql_client = gh_utils.setup_github_gql_client()

    project_data = read_project_data()
    project_data = update_project_data(github_gql_client, project_data)

    items = get_untracked_items(github_gql_client)

    track_items(args, github_gql_client, project_data, items)


if __name__ == "__main__":
    try:
        main()
    except KeyboardInterrupt:
        LOG.info("Halted via KeyboardInterrupt.")
        sys.exit(130)
    except SystemExit as e:
        sys.exit(e.code)
    # Last
    except Exception:
        traceback_formatted = textwrap.indent(
            highlight(
                traceback.format_exc(),
                PythonTracebackLexer(),
                TerminalFormatter(),
            ),
            "    ",
        )
        LOG.critical(f"Unhandled exception:\n{traceback_formatted}")
        sys.exit(1)