"""KIN-145 — Regression tests for merge_worktree retry/sleep blocking fix.

Root cause: agents/runner.py was calling merge_worktree(worktree_path, p_path,
max_retries=3, retry_delay_s=15). Git conflicts are deterministic and cannot
be resolved by retrying. Each retry causes time.sleep(15) → 3 retries = 45s
blocking sleep. The pipeline thread blocks, the parent web-server times out,
_check_parent_alive catches ESRCH → all active pipelines marked as failed →
mass failure across all projects.

Fix: Removed max_retries=3, retry_delay_s=15 kwargs from runner.py:2076.
merge_worktree now uses default max_retries=0 → conflict returns immediately.

Tests verify:
  A. merge_worktree with default max_retries=0 does NOT call time.sleep on conflict
  B. merge_worktree with default args returns {success: False} immediately on conflict
  C. merge_worktree with explicit max_retries=N DOES sleep N times (feature intact)
  D. Old kwargs (max_retries=3, retry_delay_s=15) would produce 45s total blocking
  E. runner.py source code does NOT pass max_retries or retry_delay_s (static guard)
"""

import re
from pathlib import Path
from unittest.mock import MagicMock, patch

import pytest


# ─────────────────────────────────────────────────────────────────────────────
# Helpers
# ─────────────────────────────────────────────────────────────────────────────

def _ok_run():
    m = MagicMock()
    m.returncode = 0
    m.stdout = ""
    m.stderr = ""
    return m


def _fail_run(stderr="CONFLICT (content): merge conflict in src/app.py"):
    m = MagicMock()
    m.returncode = 1
    m.stdout = ""
    m.stderr = stderr
    return m


def _conflict_diff():
    m = MagicMock()
    m.returncode = 0
    m.stdout = "src/conflict.py\n"
    m.stderr = ""
    return m


def _side_effects_for_n_conflict_attempts(n_attempts: int) -> list:
    """Build subprocess.run side_effects for n conflict attempts.

    Structure: git-add, git-commit, then per-attempt: merge-fail + diff + abort.
    """
    effects = [_ok_run(), _ok_run()]  # git add -A, git commit
    for _ in range(n_attempts):
        effects.extend([_fail_run(), _conflict_diff(), _ok_run()])  # merge-fail, diff, abort
    return effects


# ─────────────────────────────────────────────────────────────────────────────
# A & B. Default max_retries=0: no sleep, immediate failure return
# ─────────────────────────────────────────────────────────────────────────────

class TestMergeWorktreeNoRetryDefault:
    @patch("core.worktree.time.sleep")
    @patch("subprocess.run")
    def test_merge_worktree_default_args_does_not_sleep_on_conflict(
        self, mock_run, mock_sleep, tmp_path
    ):
        """KIN-145 fix A: merge_worktree с аргументами по умолчанию НЕ вызывает sleep при конфликте."""
        from core.worktree import merge_worktree

        worktree_path = tmp_path / ".kin_worktrees" / "T-145-dev"
        worktree_path.mkdir(parents=True)
        mock_run.side_effect = _side_effects_for_n_conflict_attempts(1)

        merge_worktree(str(worktree_path), str(tmp_path))

        mock_sleep.assert_not_called()

    @patch("core.worktree.time.sleep")
    @patch("subprocess.run")
    def test_merge_worktree_default_args_returns_failure_immediately_on_conflict(
        self, mock_run, mock_sleep, tmp_path
    ):
        """KIN-145 fix B: merge_worktree без retry немедленно возвращает success=False при конфликте."""
        from core.worktree import merge_worktree

        worktree_path = tmp_path / ".kin_worktrees" / "T-145-dev"
        worktree_path.mkdir(parents=True)
        mock_run.side_effect = _side_effects_for_n_conflict_attempts(1)

        result = merge_worktree(str(worktree_path), str(tmp_path))

        assert result["success"] is False
        assert "src/conflict.py" in result["conflicts"]

    @patch("core.worktree.time.sleep")
    @patch("subprocess.run")
    def test_merge_worktree_explicit_max_retries_0_no_sleep(
        self, mock_run, mock_sleep, tmp_path
    ):
        """KIN-145: explicit max_retries=0 тоже не вызывает sleep при конфликте."""
        from core.worktree import merge_worktree

        worktree_path = tmp_path / ".kin_worktrees" / "T-145-b-dev"
        worktree_path.mkdir(parents=True)
        mock_run.side_effect = _side_effects_for_n_conflict_attempts(1)

        merge_worktree(str(worktree_path), str(tmp_path), max_retries=0)

        mock_sleep.assert_not_called()


# ─────────────────────────────────────────────────────────────────────────────
# C. Retry feature still works when explicitly requested
# ─────────────────────────────────────────────────────────────────────────────

class TestMergeWorktreeRetryBehaviorIntact:
    @patch("core.worktree.time.sleep")
    @patch("subprocess.run")
    def test_merge_worktree_max_retries_2_sleeps_twice(
        self, mock_run, mock_sleep, tmp_path
    ):
        """KIN-145 fix C: retry-функциональность не сломана — max_retries=2 вызывает sleep 2 раза."""
        from core.worktree import merge_worktree

        worktree_path = tmp_path / ".kin_worktrees" / "T-145-retry-dev"
        worktree_path.mkdir(parents=True)
        # max_retries=2 → 3 total attempts (attempt 0,1,2)
        # sleep happens after attempt 0 and 1 (not after final attempt 2)
        mock_run.side_effect = _side_effects_for_n_conflict_attempts(3)

        merge_worktree(str(worktree_path), str(tmp_path), max_retries=2, retry_delay_s=5)

        assert mock_sleep.call_count == 2
        for c in mock_sleep.call_args_list:
            assert c.args[0] == 5

    @patch("core.worktree.time.sleep")
    @patch("subprocess.run")
    def test_merge_worktree_retry_with_eventual_success_no_failure(
        self, mock_run, mock_sleep, tmp_path
    ):
        """KIN-145: retry завершается успехом если второй attempt проходит."""
        from core.worktree import merge_worktree

        worktree_path = tmp_path / ".kin_worktrees" / "T-145-retry-ok"
        worktree_path.mkdir(parents=True)

        diff_ok = MagicMock()
        diff_ok.returncode = 0
        diff_ok.stdout = "src/fixed.py\n"
        diff_ok.stderr = ""

        mock_run.side_effect = [
            _ok_run(),       # git add -A
            _ok_run(),       # git commit
            _fail_run(),     # merge attempt 0: fail
            _conflict_diff(), # git diff --diff-filter=U
            _ok_run(),       # git merge --abort
            _ok_run(),       # merge attempt 1: success
            diff_ok,         # git diff HEAD~1 HEAD --name-only
        ]

        result = merge_worktree(str(worktree_path), str(tmp_path), max_retries=1, retry_delay_s=1)

        assert result["success"] is True
        assert mock_sleep.call_count == 1


# ─────────────────────────────────────────────────────────────────────────────
# D. Old buggy kwargs would have caused 45s total blocking sleep
# ─────────────────────────────────────────────────────────────────────────────

class TestOldBuggyBehaviorDocumented:
    @patch("core.worktree.time.sleep")
    @patch("subprocess.run")
    def test_old_kwargs_max_retries_3_delay_15_sleeps_45s_total(
        self, mock_run, mock_sleep, tmp_path
    ):
        """KIN-145 doc D: старые kwargs max_retries=3, retry_delay_s=15 = 45s суммарного blocking.

        Этот тест документирует удалённое поведение.
        Если этот тест когда-либо упадёт (sleep_count != 3), значит поведение изменилось.
        """
        from core.worktree import merge_worktree

        worktree_path = tmp_path / ".kin_worktrees" / "T-145-old-dev"
        worktree_path.mkdir(parents=True)
        # max_retries=3 → 4 total attempts → 3 sleeps
        mock_run.side_effect = _side_effects_for_n_conflict_attempts(4)

        merge_worktree(str(worktree_path), str(tmp_path), max_retries=3, retry_delay_s=15)

        assert mock_sleep.call_count == 3
        total_sleep_s = sum(c.args[0] for c in mock_sleep.call_args_list)
        assert total_sleep_s == 45


# ─────────────────────────────────────────────────────────────────────────────
# E. Static guard: runner.py must not pass retry kwargs to merge_worktree
# ─────────────────────────────────────────────────────────────────────────────

class TestRunnerCallSiteStaticGuard:
    def test_runner_merge_worktree_call_has_no_max_retries_kwarg(self):
        """KIN-145 guard E: runner.py НЕ передаёт max_retries в merge_worktree."""
        runner_path = Path(__file__).parent.parent / "agents" / "runner.py"
        source = runner_path.read_text()

        calls = re.findall(r"merge_worktree\([^)]*\)", source, re.DOTALL)
        assert calls, "merge_worktree не найден в agents/runner.py — проверь путь"

        for call_src in calls:
            assert "max_retries" not in call_src, (
                f"runner.py вызывает merge_worktree с max_retries: {call_src!r}\n"
                "Это баг KIN-145 — retry kwargs вызывают 45s blocking sleep!"
            )

    def test_runner_merge_worktree_call_has_no_retry_delay_kwarg(self):
        """KIN-145 guard E: runner.py НЕ передаёт retry_delay_s в merge_worktree."""
        runner_path = Path(__file__).parent.parent / "agents" / "runner.py"
        source = runner_path.read_text()

        calls = re.findall(r"merge_worktree\([^)]*\)", source, re.DOTALL)
        assert calls, "merge_worktree не найден в agents/runner.py — проверь путь"

        for call_src in calls:
            assert "retry_delay_s" not in call_src, (
                f"runner.py вызывает merge_worktree с retry_delay_s: {call_src!r}\n"
                "Это баг KIN-145 — retry kwargs вызывают 45s blocking sleep!"
            )

    def test_runner_merge_worktree_call_uses_exactly_two_positional_args(self):
        """KIN-145 guard E: вызов merge_worktree в runner.py имеет ровно 2 аргумента."""
        runner_path = Path(__file__).parent.parent / "agents" / "runner.py"
        source = runner_path.read_text()

        calls = re.findall(r"merge_worktree\(([^)]*)\)", source, re.DOTALL)
        assert calls, "merge_worktree не найден в agents/runner.py"

        for call_args in calls:
            args = [a.strip() for a in call_args.split(",") if a.strip()]
            assert len(args) == 2, (
                f"runner.py вызывает merge_worktree с {len(args)} аргументами: {call_args!r}\n"
                f"Ожидается ровно 2 (worktree_path, p_path). "
                f"Лишние kwargs — источник бага KIN-145!"
            )