"""Regression tests for KIN-117 — dev-agent silent success detection.

Root cause: dev-agents периодически заявляют об успешной реализации, но файлы
не записываются на диск. Три причины:
  (1) --dangerously-skip-permissions не добавляется когда stdin=DEVNULL (noninteractive)
  (2) worktree создаётся, но merge не происходит (uncommitted files)
  (3) permission-retry вызывает run_agent без working_dir_override=worktree_path

Fix D добавляет guard: после успешного шага dev-агента проверяет git diff —
если изменений нет, помечает шаг suspicious=True.

Acceptance criteria:
(1) Fix A: noninteractive=True → --dangerously-skip-permissions в subprocess cmd
(2) Fix D: dev-агент success + пустой git diff → step.suspicious=True
(3) Fix D: dev-агент success + непустой git diff → step.suspicious НЕ выставлен (нет false positive)
(4) Fix C: permission retry в auto_complete режиме → subprocess cwd=worktree_path
(5) Fix B: merge_worktree запускает git add -A + git commit перед git merge --no-ff
"""

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

import pytest

from core.db import init_db
from core import models


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

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


def _fail(stdout="", stderr="error"):
    m = MagicMock()
    m.returncode = 1
    m.stdout = stdout
    m.stderr = stderr
    return m


def _claude_success():
    return _ok(json.dumps({"result": "all done, implementation complete"}))


def _permission_denied():
    """Subprocess result that triggers _is_permission_error."""
    m = MagicMock()
    m.returncode = 1
    m.stdout = ""
    m.stderr = "permission denied to write file"
    return m


# ─── Fixtures ────────────────────────────────────────────────────────────────

@pytest.fixture
def conn_basic(tmp_path):
    """Project with path=tmp_path (real dir), review mode, no worktrees."""
    c = init_db(":memory:")
    models.create_project(c, "prj1", "Test Project", str(tmp_path),
                          tech_stack=["python"])
    models.create_task(c, "TSK-001", "prj1", "Fix something",
                       brief={"route_type": "debug"})
    yield c, str(tmp_path)
    c.close()


@pytest.fixture
def conn_auto_wt(tmp_path):
    """Project with auto_complete mode and worktrees enabled, real path."""
    c = init_db(":memory:")
    models.create_project(c, "prj2", "Auto WT Project", str(tmp_path),
                          tech_stack=["python"])
    c.execute(
        "UPDATE projects SET execution_mode='auto_complete', worktrees_enabled=1 WHERE id='prj2'"
    )
    c.commit()
    models.create_task(c, "TSK-002", "prj2", "Fix with worktree",
                       brief={"route_type": "debug"})
    yield c, str(tmp_path)
    c.close()


# ─── Fix A: noninteractive mode добавляет --dangerously-skip-permissions ─────

class TestFixA_NoninteractiveSkipPermissions:
    """Fix A: is_noninteractive вычисляется ДО проверки allow_write."""

    @patch("agents.runner.subprocess.run")
    def test_noninteractive_adds_dangerously_skip_permissions(self, mock_run):
        """noninteractive=True, allow_write=False → --dangerously-skip-permissions в cmd."""
        from agents.runner import _run_claude
        mock_run.return_value = _claude_success()

        _run_claude("test prompt", noninteractive=True, allow_write=False)

        cmd = mock_run.call_args[0][0]
        assert "--dangerously-skip-permissions" in cmd, (
            "--dangerously-skip-permissions must be added when noninteractive=True, "
            f"got cmd: {cmd}"
        )

    @patch("agents.runner.subprocess.run")
    def test_allow_write_adds_dangerously_skip_permissions(self, mock_run):
        """allow_write=True → --dangerously-skip-permissions в cmd (существующее поведение)."""
        from agents.runner import _run_claude
        mock_run.return_value = _claude_success()

        _run_claude("test prompt", allow_write=True, noninteractive=False)

        cmd = mock_run.call_args[0][0]
        assert "--dangerously-skip-permissions" in cmd

    @patch("agents.runner.subprocess.run")
    def test_interactive_no_allow_write_no_skip_permissions(self, mock_run):
        """allow_write=False + noninteractive=False → --dangerously-skip-permissions НЕ в cmd."""
        from agents.runner import _run_claude
        mock_run.return_value = _claude_success()

        _run_claude("test prompt", allow_write=False, noninteractive=False)

        cmd = mock_run.call_args[0][0]
        assert "--dangerously-skip-permissions" not in cmd, (
            "--dangerously-skip-permissions must NOT be added in interactive mode without allow_write"
        )


# ─── Fix D: suspicious guard (non-worktree path) ─────────────────────────────

class TestFixD_SuspiciousGuardNoWorktree:
    """Fix D: guard проверяет git diff после успешного шага dev-агента."""

    @patch("agents.runner.check_claude_auth")
    @patch("agents.runner.subprocess.run")
    def test_success_empty_git_diff_marks_step_suspicious(self, mock_run, mock_auth,
                                                           conn_basic):
        """dev-агент success + пустой git diff → result['suspicious']=True."""
        from agents.runner import run_pipeline
        conn, proj_path = conn_basic

        def side_effect(cmd, **kwargs):
            cmd_str = " ".join(str(c) for c in cmd)
            if "diff" in cmd_str:
                return _ok("")  # empty diff → no file changes
            return _claude_success()  # claude call

        mock_run.side_effect = side_effect
        mock_auth.return_value = None

        result = run_pipeline(conn, "TSK-001", [{"role": "debugger", "brief": "fix it"}])

        assert result["success"] is True
        step_result = result["results"][0]
        assert step_result.get("suspicious") is True, (
            "Step must be marked suspicious=True when agent claims success "
            f"but git diff is empty. Got result: {step_result}"
        )

    @patch("agents.runner.check_claude_auth")
    @patch("agents.runner.subprocess.run")
    def test_success_nonempty_git_diff_not_suspicious(self, mock_run, mock_auth,
                                                       conn_basic):
        """dev-агент success + непустой git diff → suspicious НЕ выставляется."""
        from agents.runner import run_pipeline
        conn, proj_path = conn_basic

        def side_effect(cmd, **kwargs):
            cmd_str = " ".join(str(c) for c in cmd)
            if "diff" in cmd_str:
                return _ok("src/app.py\nsrc/utils.py\n")  # files changed
            return _claude_success()

        mock_run.side_effect = side_effect
        mock_auth.return_value = None

        result = run_pipeline(conn, "TSK-001", [{"role": "debugger", "brief": "fix it"}])

        assert result["success"] is True
        step_result = result["results"][0]
        assert not step_result.get("suspicious"), (
            "Step must NOT be suspicious when git diff shows changed files. "
            f"Got result: {step_result}"
        )

    @patch("agents.runner.check_claude_auth")
    @patch("agents.runner.subprocess.run")
    def test_suspicious_step_does_not_block_pipeline(self, mock_run, mock_auth,
                                                      conn_basic):
        """suspicious шаг не останавливает pipeline — только выставляет флаг."""
        from agents.runner import run_pipeline
        conn, proj_path = conn_basic

        def side_effect(cmd, **kwargs):
            cmd_str = " ".join(str(c) for c in cmd)
            if "diff" in cmd_str:
                return _ok("")  # empty diff → suspicious, but pipeline continues
            return _claude_success()

        mock_run.side_effect = side_effect
        mock_auth.return_value = None

        result = run_pipeline(conn, "TSK-001", [{"role": "debugger", "brief": "fix"}])

        # Pipeline must succeed even when step is suspicious
        assert result["success"] is True
        assert result["steps_completed"] == 1


# ─── Fix D: suspicious guard (worktree path) ─────────────────────────────────

class TestFixD_SuspiciousGuardWithWorktree:
    """Fix D: guard проверяет merged_files после worktree merge."""

    @patch("agents.runner.check_claude_auth")
    @patch("core.worktree.cleanup_worktree")
    @patch("core.worktree.merge_worktree",
           return_value={"success": True, "conflicts": [], "merged_files": []})
    @patch("core.worktree.create_worktree", return_value="/tmp/WT-suspicious-debugger")
    @patch("core.worktree.ensure_gitignore")
    @patch("agents.runner.subprocess.run")
    def test_worktree_empty_merged_files_marks_suspicious(
        self, mock_run, mock_gitignore, mock_create, mock_merge, mock_cleanup, mock_auth,
        conn_auto_wt
    ):
        """worktree merge возвращает merged_files=[] → шаг помечается suspicious=True."""
        from agents.runner import run_pipeline
        conn, proj_path = conn_auto_wt
        mock_run.return_value = _claude_success()
        mock_auth.return_value = None

        result = run_pipeline(conn, "TSK-002", [{"role": "debugger", "brief": "fix it"}])

        assert result["success"] is True
        step_result = result["results"][0]
        assert step_result.get("suspicious") is True, (
            "Step must be marked suspicious when worktree merge returns merged_files=[]. "
            f"Got result: {step_result}"
        )

    @patch("agents.runner.check_claude_auth")
    @patch("core.worktree.cleanup_worktree")
    @patch("core.worktree.merge_worktree",
           return_value={"success": True, "conflicts": [], "merged_files": ["src/app.py"]})
    @patch("core.worktree.create_worktree", return_value="/tmp/WT-ok-debugger")
    @patch("core.worktree.ensure_gitignore")
    @patch("agents.runner.subprocess.run")
    def test_worktree_nonempty_merged_files_not_suspicious(
        self, mock_run, mock_gitignore, mock_create, mock_merge, mock_cleanup, mock_auth,
        conn_auto_wt
    ):
        """worktree merge возвращает merged_files=['src/app.py'] → шаг НЕ suspicious."""
        from agents.runner import run_pipeline
        conn, proj_path = conn_auto_wt
        mock_run.return_value = _claude_success()
        mock_auth.return_value = None

        result = run_pipeline(conn, "TSK-002", [{"role": "debugger", "brief": "fix it"}])

        assert result["success"] is True
        step_result = result["results"][0]
        assert not step_result.get("suspicious"), (
            "Step must NOT be suspicious when worktree has merged files. "
            f"Got result: {step_result}"
        )


# ─── Fix C: permission retry использует worktree_path ─────────────────────────

class TestFixC_PermissionRetryWorktreePath:
    """Fix C: retry после permission error передаёт working_dir_override=worktree_path."""

    FAKE_WT = "/tmp/fake-worktree-kin117"

    @patch("agents.runner.check_claude_auth")
    @patch("core.worktree.cleanup_worktree")
    @patch("core.worktree.merge_worktree",
           return_value={"success": True, "conflicts": [], "merged_files": ["fix.py"]})
    @patch("core.worktree.create_worktree", return_value=FAKE_WT)
    @patch("core.worktree.ensure_gitignore")
    @patch("agents.runner.subprocess.run")
    def test_permission_retry_uses_worktree_cwd(
        self, mock_run, mock_gitignore, mock_create, mock_merge, mock_cleanup, mock_auth,
        conn_auto_wt
    ):
        """При permission error в auto_complete режиме retry запускается в cwd=worktree_path."""
        from agents.runner import run_pipeline
        conn, proj_path = conn_auto_wt

        claude_calls = []

        def side_effect(cmd, **kwargs):
            if "--output-format" in cmd:
                cwd = kwargs.get("cwd")
                claude_calls.append({"cmd": list(cmd), "cwd": cwd})
                # First claude call → permission error triggers retry
                if len(claude_calls) == 1:
                    return _permission_denied()
                return _claude_success()
            # Non-claude subprocess calls (git diff, etc.)
            return _ok("")

        mock_run.side_effect = side_effect
        mock_auth.return_value = None

        result = run_pipeline(conn, "TSK-002",
                              [{"role": "debugger", "brief": "implement feature"}])

        assert len(claude_calls) >= 2, (
            f"Expected at least 2 claude calls (first + retry), got {len(claude_calls)}"
        )
        retry_call = claude_calls[1]
        assert retry_call["cwd"] == self.FAKE_WT, (
            f"Retry must use worktree_path={self.FAKE_WT!r} as cwd, "
            f"got {retry_call['cwd']!r}. "
            "Fix: add working_dir_override=worktree_path to permission retry run_agent call."
        )


# ─── Fix B: merge_worktree auto-commits перед merge ──────────────────────────

class TestFixB_MergeWorktreePreCommit:
    """Fix B: merge_worktree выполняет git add -A + git commit перед git merge --no-ff."""

    @patch("subprocess.run")
    def test_merge_worktree_runs_git_add_before_merge(self, mock_run, tmp_path):
        """git add -A вызывается ДО git merge --no-ff."""
        from core.worktree import merge_worktree

        worktree_path = tmp_path / ".kin_worktrees" / "TASK-001-debugger"
        worktree_path.mkdir(parents=True)

        commands_seen = []

        def run_side_effect(cmd, **kwargs):
            commands_seen.append(list(cmd))
            return _ok()

        mock_run.side_effect = run_side_effect

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

        flat = [" ".join(c) for c in commands_seen]
        add_idx = next(
            (i for i, c in enumerate(flat) if "add" in c and "-A" in c), None
        )
        merge_idx = next(
            (i for i, c in enumerate(flat) if "merge" in c and "--no-ff" in c), None
        )

        assert add_idx is not None, (
            "git add -A must be called before merge. "
            f"Commands seen: {flat}"
        )
        assert merge_idx is not None, "git merge --no-ff must be called"
        assert add_idx < merge_idx, (
            f"git add -A (idx={add_idx}) must be BEFORE git merge --no-ff (idx={merge_idx})"
        )

    @patch("subprocess.run")
    def test_merge_worktree_runs_git_commit_before_merge(self, mock_run, tmp_path):
        """git commit вызывается ДО git merge --no-ff."""
        from core.worktree import merge_worktree

        worktree_path = tmp_path / ".kin_worktrees" / "TASK-001-debugger"
        worktree_path.mkdir(parents=True)

        commands_seen = []

        def run_side_effect(cmd, **kwargs):
            commands_seen.append(list(cmd))
            return _ok()

        mock_run.side_effect = run_side_effect

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

        flat = [" ".join(c) for c in commands_seen]
        commit_idx = next(
            (i for i, c in enumerate(flat) if "commit" in c and "-m" in c), None
        )
        merge_idx = next(
            (i for i, c in enumerate(flat) if "merge" in c and "--no-ff" in c), None
        )

        assert commit_idx is not None, (
            "git commit -m must be called before merge. "
            f"Commands seen: {flat}"
        )
        assert merge_idx is not None, "git merge --no-ff must be called"
        assert commit_idx < merge_idx, (
            f"git commit (idx={commit_idx}) must be BEFORE git merge --no-ff (idx={merge_idx})"
        )

    @patch("subprocess.run")
    def test_merge_worktree_commit_failure_does_not_block_merge(self, mock_run, tmp_path):
        """Если git commit возвращает non-zero (нечего коммитить) — merge всё равно запускается."""
        from core.worktree import merge_worktree

        worktree_path = tmp_path / ".kin_worktrees" / "TASK-001-debugger"
        worktree_path.mkdir(parents=True)

        commands_seen = []

        def run_side_effect(cmd, **kwargs):
            commands_seen.append(list(cmd))
            cmd_str = " ".join(cmd)
            if "commit" in cmd_str:
                return _fail(stderr="nothing to commit")  # nothing to commit
            return _ok()

        mock_run.side_effect = run_side_effect

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

        flat = [" ".join(c) for c in commands_seen]
        merge_calls = [c for c in flat if "merge" in c and "--no-ff" in c]
        assert len(merge_calls) > 0, (
            "git merge --no-ff must still be called even when pre-commit fails. "
            f"Commands seen: {flat}"
        )
        assert result["success"] is True