from __future__ import annotations

from pathlib import Path

import pytest

from repo_manager.identifiers import (
    derive_work_record_uuid,
    plan_identifier_migration,
    scan_live_identifier_collisions,
)


def _workplan(path: Path, identifier: str, status: str, task_status: str = "todo") -> None:
    path.parent.mkdir(parents=True, exist_ok=True)
    path.write_text(
        f"""---
id: {identifier}
title: Test
status: {status}
---

## Task

```task
id: {identifier}-T01
status: {task_status}
```
""",
        encoding="utf-8",
    )


def test_uuid_derivation_is_stable_and_namespace_scoped() -> None:
    first = derive_work_record_uuid("helixforge", "RMGR-WP-0005")
    assert str(first) == "6dcf854e-9229-569d-90f0-2d9df235a61d"
    assert derive_work_record_uuid("helixforge", "RMGR-WP-0005") == first
    assert derive_work_record_uuid("client-a", "RMGR-WP-0005") != first
    with pytest.raises(ValueError):
        derive_work_record_uuid("Client A", "RMGR-WP-0005")


def test_preflight_blocks_live_collision_but_ignores_archived_history(tmp_path: Path) -> None:
    one = tmp_path / "one"
    two = tmp_path / "two"
    _workplan(one / "workplans" / "one.md", "SHARED-WP-0001", "active")
    _workplan(two / "workplans" / "two.md", "SHARED-WP-0001", "ready")
    report = scan_live_identifier_collisions(tmp_path)
    assert report["ok"] is False
    assert "SHARED-WP-0001" in report["collisions"]

    _workplan(two / "workplans" / "two.md", "SHARED-WP-0001", "archived")
    report = scan_live_identifier_collisions(tmp_path)
    assert report["ok"] is True


def test_migration_plan_preserves_mapping_and_is_atomic_per_repo(tmp_path: Path) -> None:
    one = tmp_path / "one"
    two = tmp_path / "two"
    _workplan(one / "workplans" / "one.md", "ONE-WP-0001", "active")
    _workplan(two / "workplans" / "two.md", "TWO-WP-0001", "ready", task_status="done")

    report = plan_identifier_migration(tmp_path, "fleet-a")

    assert report["ok"] is True
    assert report["apply_policy"] == "all-or-nothing per repository"
    assert report["totals"] == {
        "repositories": 2,
        "eligible": 2,
        "skipped": 0,
        "records": 3,
        "replace": 0,
        "assign": 3,
        "unchanged": 0,
    }
    one_plan = next(item for item in report["repositories"] if item["repo"] == "one")
    assert one_plan["atomic_unit"] is True
    assert {item["record_id"] for item in one_plan["mappings"]} == {
        "ONE-WP-0001",
        "ONE-WP-0001-T01",
    }
    assert all(item["current_uuid"] is None for item in one_plan["mappings"])


def test_migration_plan_skips_entire_repo_affected_by_collision(tmp_path: Path) -> None:
    one = tmp_path / "one"
    two = tmp_path / "two"
    _workplan(one / "workplans" / "one.md", "SHARED-WP-0001", "active")
    _workplan(one / "workplans" / "safe.md", "ONE-WP-0002", "active")
    _workplan(two / "workplans" / "two.md", "SHARED-WP-0001", "ready")

    report = plan_identifier_migration(tmp_path, "fleet-a")

    assert report["ok"] is False
    assert report["totals"]["skipped"] == 2
    one_plan = next(item for item in report["repositories"] if item["repo"] == "one")
    assert one_plan["eligible"] is False
    assert any(item["record_id"] == "ONE-WP-0002" for item in one_plan["mappings"])
    assert any(item["reason"] == "live identifier collision" for item in one_plan["blockers"])