"""Tests for the lifecycle test scripts' plan-only/full mode flag (REQ-134).

The lifecycle scripts (run_lifecycle_test.sh, run_lifecycle_destroy.sh,
run_l2_lifecycle_test.sh, run_l2_lifecycle_destroy.sh) wrap run_platform.sh.
REQ-134 (v1.12) adds the ACDL_LIFECYCLE_MODE env var: default "plan" runs
`run_platform.sh --plan-only` (fast, no AWS mutation); "full" runs the real
`--apply`/`--destroy` against live AWS.

These tests verify the dispatch logic offline by inspecting script content
(running the scripts end-to-end requires AWS credentials in full mode).
"""
import re

import pytest

ROOT = __import__("pathlib").Path(__file__).resolve().parent.parent

SCRIPTS = [
    "scripts/run_lifecycle_test.sh",
    "scripts/run_lifecycle_destroy.sh",
    "scripts/run_l2_lifecycle_test.sh",
    "scripts/run_l2_lifecycle_destroy.sh",
]


def _read(path):
    return (ROOT / path).read_text()


class TestLifecycleModeFlag:
    """REQ-134: the lifecycle scripts dispatch to plan-only by default."""

    @pytest.mark.parametrize("script", SCRIPTS)
    def test_script_reads_acdl_lifecycle_mode(self, script):
        """Every lifecycle script reads ACDL_LIFECYCLE_MODE with a 'plan' default."""
        src = _read(script)
        # The default must be 'plan' (the speed-up default). The scripts use
        # an intermediate LIFECYCLE_MODE var sourced from ACDL_LIFECYCLE_MODE.
        assert "${ACDL_LIFECYCLE_MODE:-plan}" in src, \
            f"{script} must read ACDL_LIFECYCLE_MODE defaulting to 'plan'"
        assert "LIFECYCLE_MODE=" in src, \
            f"{script} must assign LIFECYCLE_MODE from the env var"

    @pytest.mark.parametrize("script", [
        "scripts/run_lifecycle_test.sh",
        "scripts/run_l2_lifecycle_test.sh",
    ])
    def test_apply_scripts_dispatch_to_plan_only_by_default(self, script):
        """Apply/modify scripts run --plan-only when mode != full."""
        src = _read(script)
        assert "--plan-only" in src, f"{script} must support --plan-only (plan mode)"
        assert "--apply" in src, f"{script} must support --apply (full mode)"
        # The dispatch must branch on LIFECYCLE_MODE
        assert "LIFECYCLE_MODE" in src and "full" in src, \
            f"{script} must branch on LIFECYCLE_MODE == 'full'"

    @pytest.mark.parametrize("script", [
        "scripts/run_lifecycle_destroy.sh",
        "scripts/run_l2_lifecycle_destroy.sh",
    ])
    def test_destroy_scripts_noop_in_plan_mode(self, script):
        """Destroy scripts are a no-op (exit 0) in plan mode — nothing was applied."""
        src = _read(script)
        # The destroy script must check the mode and exit 0 in plan mode.
        assert "nothing to destroy" in src, \
            f"{script} must no-op (with a message) in plan mode"
        assert "--destroy" in src, f"{script} must still support --destroy in full mode"
        assert "LIFECYCLE_MODE" in src, f"{script} must read LIFECYCLE_MODE"

    def test_apply_script_plan_mode_uses_plan_only(self):
        """In plan mode, run_lifecycle_test.sh dispatches to --plan-only."""
        src = _read("scripts/run_lifecycle_test.sh")
        # The if/else: full -> --apply, else -> --plan-only
        assert re.search(r'if.*LIFECYCLE_MODE.*=.*"full".*;.*then', src)
        assert re.search(r'else\s+bash scripts/run_platform\.sh --plan-only', src, re.DOTALL)

    def test_apply_script_full_mode_uses_apply(self):
        """In full mode, run_lifecycle_test.sh dispatches to --apply."""
        src = _read("scripts/run_lifecycle_test.sh")
        assert re.search(r'LIFECYCLE_MODE.*=.*"full".*bash scripts/run_platform\.sh --apply', src, re.DOTALL)

    def test_destroy_script_plan_mode_exits_zero(self):
        """In plan mode, the L1 destroy script exits 0 without calling run_platform."""
        src = _read("scripts/run_lifecycle_destroy.sh")
        assert re.search(r'LIFECYCLE_MODE.*!=.*"full".*exiting 0', src, re.DOTALL)

    def test_l2_apply_script_dispatches_correctly(self):
        """The L2 apply script dispatches to plan-only by default, apply in full."""
        src = _read("scripts/run_l2_lifecycle_test.sh")
        assert "--plan-only" in src and "--apply" in src
        assert re.search(r'if.*LIFECYCLE_MODE.*=.*"full"', src)

    def test_l2_destroy_script_noop_in_plan_mode(self):
        """The L2 destroy script is a no-op in plan mode."""
        src = _read("scripts/run_l2_lifecycle_destroy.sh")
        assert "nothing to destroy" in src
        assert re.search(r'LIFECYCLE_MODE.*!=.*"full".*exiting 0', src, re.DOTALL)

    def test_vpc_injection_gated_on_full_mode(self):
        """VPC output injection is gated on full mode (plan mode skips it)."""
        src = _read("scripts/run_lifecycle_test.sh")
        # The VPC injection block must be gated on LIFECYCLE_MODE == full.
        assert re.search(r'LIFECYCLE_MODE.*=.*"full".*&&.*echo.*VPC_DEPENDENT', src, re.DOTALL) or \
               re.search(r'\[ "\$LIFECYCLE_MODE" = "full" \] && echo.*VPC_DEPENDENT', src, re.DOTALL)