#!/usr/bin/env bash
# Regenerates every file in docs/output/.
#
# docs/output/00, 01, 02, 04, 05 come straight from `mvn test` -- the four committed test
# classes write them via Capture.write() as a side effect of their own assertions.
#
# docs/output/03, 06, 07 come from three scratch classes that are deliberately NOT part of the
# committed suite (a bogus display-name placeholder, and two deterministic "flaky test" demos).
# This script recreates them in a throwaway directory, compiles and runs them against the
# JUnit Platform Console Standalone launcher, captures the real output, and cleans up -- so the
# committed suite stays green at 14/14 while every number in docs/output/ still traces back to a
# real run.
#
# Requires: JDK 17+ on PATH (JUnit 6 requires Java 17; this module was built on JDK 25), network
# access to download the console-standalone jar on first run.

set -euo pipefail
cd "$(dirname "$0")/.."

JUNIT_VERSION="6.1.3"
JAR_DIR="$(mktemp -d)"
STANDALONE_JAR="${JAR_DIR}/junit-platform-console-standalone-${JUNIT_VERSION}.jar"
trap 'rm -rf "${JAR_DIR}"' EXIT

echo "== 1/3: committed suite (mvn test) =="
mvn -q test
mvn test > "${JAR_DIR}/full-run.txt" 2>&1 || true
grep -v '^Picked up JAVA_TOOL_OPTIONS' "${JAR_DIR}/full-run.txt" | tail -20 > docs/output/00-full-test-run.txt
sed -i '1i# mvn test -- full committed suite (ReliabilityTest, CustomNameTest, LifecycleTest, MetadataTest)\n' docs/output/00-full-test-run.txt

echo "== 2/3: downloading junit-platform-console-standalone ${JUNIT_VERSION} =="
curl -fsSL -o "${STANDALONE_JAR}" \
  "https://repo1.maven.org/maven2/org/junit/platform/junit-platform-console-standalone/${JUNIT_VERSION}/junit-platform-console-standalone-${JUNIT_VERSION}.jar"

echo "== 3/3: scratch classes (written, run, captured, discarded) =="
SCRATCH_SRC="${JAR_DIR}/scratch-src"
SCRATCH_CLASSES="${JAR_DIR}/scratch-classes"
PKG_DIR="${SCRATCH_SRC}/com/ankurm/tutorials/junit/repeated"
mkdir -p "${PKG_DIR}" "${SCRATCH_CLASSES}"

cat > "${PKG_DIR}/ScratchPlaceholderTest.java" <<'EOF'
package com.ankurm.tutorials.junit.repeated;

import org.junit.jupiter.api.RepeatedTest;

class ScratchPlaceholderTest {

    @RepeatedTest(value = 2, name = "{shortDisplayname} test")
    void bogusPlaceholderTest() {
    }
}
EOF

cat > "${PKG_DIR}/FlakyDetectionDemoTest.java" <<'EOF'
package com.ankurm.tutorials.junit.repeated;

import org.junit.jupiter.api.RepeatedTest;
import org.junit.jupiter.api.RepetitionInfo;

import static org.junit.jupiter.api.Assertions.fail;

class FlakyDetectionDemoTest {

    @RepeatedTest(10)
    void intermittentRaceCondition(RepetitionInfo info) {
        int current = info.getCurrentRepetition();
        if (current == 4 || current == 8) {
            fail("simulated race condition reproduced on repetition " + current);
        }
    }
}
EOF

cat > "${PKG_DIR}/FailureThresholdStopsRemainingDemoTest.java" <<'EOF'
package com.ankurm.tutorials.junit.repeated;

import org.junit.jupiter.api.RepeatedTest;
import org.junit.jupiter.api.RepetitionInfo;

import static org.junit.jupiter.api.Assertions.fail;

class FailureThresholdStopsRemainingDemoTest {

    @RepeatedTest(value = 10, failureThreshold = 2)
    void intermittentRaceCondition(RepetitionInfo info) {
        int current = info.getCurrentRepetition();
        if (current == 4 || current == 8) {
            fail("simulated race condition reproduced on repetition " + current);
        }
    }
}
EOF

javac -cp "${STANDALONE_JAR}" -d "${SCRATCH_CLASSES}" "${PKG_DIR}"/*.java

run_scratch() {
  # These scratch runs are EXPECTED to report test failures (that's the point of 06 and 07),
  # so capture output via command substitution with `|| true` rather than a raw pipe -- under
  # `set -o pipefail` a piped non-zero exit from `java` would otherwise abort this script.
  local class_name="$1" out_file="$2" header="$3" raw_out
  raw_out="$(java -jar "${STANDALONE_JAR}" execute \
      -cp "${SCRATCH_CLASSES}" \
      --select-class="com.ankurm.tutorials.junit.repeated.${class_name}" \
      --details=tree --disable-ansi-colors 2>&1 || true)"
  {
    echo "${header}"
    echo
    printf '%s\n' "${raw_out}" | grep -v '^Picked up JAVA_TOOL_OPTIONS'
  } > "docs/output/${out_file}"
}

run_scratch "ScratchPlaceholderTest" "03-bogus-placeholder-scratch.txt" \
  "# Scratch run: {shortDisplayname} is not a real placeholder (ScratchPlaceholderTest, removed before commit)"

run_scratch "FlakyDetectionDemoTest" "06-flaky-detected.txt" \
  "# Scratch run: @RepeatedTest with no failureThreshold -- all 10 repetitions still run even though 2 fail (FlakyDetectionDemoTest, removed before commit)"

run_scratch "FailureThresholdStopsRemainingDemoTest" "07-failure-threshold-skips-remaining.txt" \
  "# Scratch run: @RepeatedTest(failureThreshold = 2) -- after the 2nd failure (repetition 8), repetitions 9 and 10 are SKIPPED, not invoked (FailureThresholdStopsRemainingDemoTest, removed before commit)"

echo "Done -- docs/output/ regenerated."