"""Shared task→permission map for resolver and tool gates (#69).

``gitea_resolve_task_capability`` and issue-mutating MCP tools must agree on
which profile operation each task requires. This module is the single source
of truth; regression tests assert tool gates cannot drift from it.
"""

from __future__ import annotations

TASK_CAPABILITY_MAP: dict[str, dict[str, str]] = {
    "create_issue": {
        "permission": "gitea.issue.create",
        "role": "author",
    },
    "comment_issue": {
        "permission": "gitea.issue.comment",
        "role": "author",
    },
    "close_issue": {
        "permission": "gitea.issue.close",
        "role": "author",
    },
    "claim_issue": {
        "permission": "gitea.issue.comment",
        "role": "author",
    },
    "mark_issue": {
        "permission": "gitea.issue.comment",
        "role": "author",
    },
    "set_issue_labels": {
        "permission": "gitea.issue.comment",
        "role": "author",
    },
    "create_branch": {
        "permission": "gitea.branch.create",
        "role": "author",
    },
    "push_branch": {
        "permission": "gitea.branch.push",
        "role": "author",
    },
    "create_pr": {
        "permission": "gitea.pr.create",
        "role": "author",
    },
    "comment_pr": {
        "permission": "gitea.pr.comment",
        "role": "author",
    },
    "close_pr": {
        "permission": "gitea.pr.close",
        "role": "author",
    },
    "address_pr_change_requests": {
        "permission": "gitea.branch.push",
        "role": "author",
    },
    "review_pr": {
        "permission": "gitea.pr.review",
        "role": "reviewer",
    },
    "merge_pr": {
        "permission": "gitea.pr.merge",
        "role": "reviewer",
    },
    "blind_pr_queue_review": {
        "permission": "gitea.pr.review",
        "role": "reviewer",
    },
    "request_changes_pr": {
        "permission": "gitea.pr.request_changes",
        "role": "reviewer",
    },
    "approve_pr": {
        "permission": "gitea.pr.approve",
        "role": "reviewer",
    },
    "delete_branch": {
        "permission": "gitea.branch.delete",
        "role": "author",
    },
    "commit_files": {
        "permission": "gitea.repo.commit",
        "role": "author",
    },
    "gitea_commit_files": {
        "permission": "gitea.repo.commit",
        "role": "author",
    },
}

# Issue-mutating MCP tools and their resolver task keys.
ISSUE_MUTATION_TOOL_TASKS: dict[str, str] = {
    "gitea_create_issue": "create_issue",
    "gitea_close_issue": "close_issue",
    "gitea_create_issue_comment": "comment_issue",
    "gitea_mark_issue": "mark_issue",
    "gitea_set_issue_labels": "set_issue_labels",
    "gitea_commit_files": "commit_files",
}


def required_permission(task: str) -> str:
    """Return the canonical operation a *task* requires (fail closed)."""
    try:
        return TASK_CAPABILITY_MAP[task]["permission"]
    except KeyError as exc:
        raise KeyError(f"Unknown task/action: {task!r} (fail closed)") from exc


def required_role(task: str) -> str:
    """Return author/reviewer role kind for *task* (fail closed)."""
    try:
        return TASK_CAPABILITY_MAP[task]["role"]
    except KeyError as exc:
        raise KeyError(f"Unknown task/action: {task!r} (fail closed)") from exc


def tool_required_permission(tool_name: str) -> str:
    """Return the operation an issue-mutating tool must gate on."""
    return required_permission(ISSUE_MUTATION_TOOL_TASKS[tool_name])