bashrs 6.66.0

#![allow(clippy::unwrap_used)]
#![allow(clippy::expect_used)]
#![allow(unused_imports)]

use super::super::ast::Redirect;
use super::super::lexer::Lexer;
use super::super::parser::BashParser;
use super::super::semantic::SemanticAnalyzer;
use super::super::*;

#[test]
fn test_JOB_001_background_jobs_not_supported() {
    // Background jobs (&) are NOT SUPPORTED (non-deterministic, race conditions)
    let background_jobs = concat!(
        "# NOT SUPPORTED: Background job (non-deterministic)\n",
        "long_running_task &\n",
        "echo \"Task started in background\"\n",
        "\n",
        "# NOT SUPPORTED: Multiple background jobs (race conditions)\n",
        "task1 &\n",
        "task2 &\n",
        "task3 &\n",
        "wait  # Wait for all background jobs\n",
        "\n",
        "# NOT SUPPORTED: Background job with no wait (orphan process)\n",
        "cleanup_temp_files &\n",
        "\n",
        "# NOT SUPPORTED: Fire-and-forget background job\n",
        "send_notification &\n",
        "exit 0\n",
    );

    let mut lexer = Lexer::new(background_jobs);
    // Parser may not support & - both Ok and Err are acceptable
    if let Ok(tokens) = lexer.tokenize() {
        assert!(
            !tokens.is_empty(),
            "Background jobs should tokenize (even though NOT SUPPORTED)"
        );
    }
}

#[test]
fn test_JOB_001_background_jobs_purification_strategies() {
    // DOCUMENTATION: Background job purification strategies (4 strategies)
    //
    // STRATEGY 1: Convert to foreground execution (RECOMMENDED)
    // Use case: Task doesn't need to run in background
    // INPUT: long_task &; do_work; wait
    // PURIFIED: long_task; do_work
    // Pros: Deterministic, simple, no race conditions
    // Cons: May be slower (sequential vs parallel)
    //
    // STRATEGY 2: Sequential execution (RECOMMENDED)
    // Use case: Multiple independent tasks
    // INPUT: task1 &; task2 &; task3 &; wait
    // PURIFIED: task1; task2; task3
    // Pros: Deterministic, reproducible, no race conditions
    // Cons: Slower than parallel (if tasks are independent)
    //
    // STRATEGY 3: Remove background job entirely
    // Use case: Background job is non-essential (cleanup, notification)
    // INPUT: send_notification &; exit 0
    // PURIFIED: exit 0  # Remove non-essential background task
    // Pros: Simplest, no complexity
    // Cons: Loses functionality
    //
    // STRATEGY 4: Use make -j for parallelism (if needed)
    // Use case: Need actual parallelism for performance
    // INPUT: for file in *.txt; do process "$file" & done; wait
    // PURIFIED: Write Makefile with parallel targets, use make -j4
    // Pros: Deterministic parallelism, explicit dependencies
    // Cons: Requires Makefile, more complex

    let purification_strategies = r#"
# STRATEGY 1: Convert to foreground (RECOMMENDED)
# INPUT: long_task &; do_work; wait
long_task
do_work

# STRATEGY 2: Sequential execution (RECOMMENDED)
# INPUT: task1 &; task2 &; task3 &; wait
task1
task2
task3

# STRATEGY 3: Remove background job
# INPUT: send_notification &; exit 0
exit 0  # Remove non-essential background task

# STRATEGY 4: Use make for parallelism (if needed)
# Create Makefile:
# all: file1.out file2.out file3.out
# %.out: %.txt
#     process $< > $@
#
# Then: make -j4  # Deterministic parallelism with explicit dependencies

# REAL-WORLD EXAMPLE: Log processing
# BAD (non-deterministic):
# for log in *.log; do
#     process_log "$log" &
# done
# wait

# GOOD (deterministic):
for log in *.log; do
    process_log "$log"
done
"#;

    let mut lexer = Lexer::new(purification_strategies);
    if let Ok(tokens) = lexer.tokenize() {
        assert!(
            !tokens.is_empty(),
            "Purification strategies should tokenize successfully"
        );
        let _ = tokens;
    }

    // All strategies are DETERMINISTIC
    // PREFERRED: Strategies 1-2 (foreground execution)
    // Strategy 4 acceptable if parallelism required (use make -j)
}

#[test]
fn test_JOB_001_background_jobs_race_conditions() {
    // DOCUMENTATION: Background job race conditions (5 critical race conditions)
    //
    // RACE 1: Output interleaving
    // task1 &
    // task2 &
    // wait
    // Output from task1 and task2 interleaves unpredictably
    // PROBLEM: Cannot predict output order
    //
    // RACE 2: File access conflicts
    // process file.txt &
    // modify file.txt &
    // wait
    // Both jobs access file.txt simultaneously
    // PROBLEM: Data corruption, race condition
    //
    // RACE 3: Resource contention
    // heavy_task &
    // heavy_task &
    // heavy_task &
    // wait
    // All tasks compete for CPU/memory
    // PROBLEM: Timing varies, non-deterministic performance
    //
    // RACE 4: Dependency violations
    // generate_data &
    // process_data &  # Depends on generate_data output
    // wait
    // process_data may run before generate_data completes
    // PROBLEM: Missing dependency, wrong results
    //
    // RACE 5: Exit status ambiguity
    // task1 &
    // task2 &
    // wait
    // If task1 fails, exit status is non-deterministic (depends on timing)
    // PROBLEM: Cannot reliably check for errors

    let race_conditions = r#"
# RACE 1: Output interleaving (non-deterministic)
echo "Task 1 starting" &
echo "Task 2 starting" &
wait
# Output order unpredictable:
# Task 1 starting
# Task 2 starting
# OR
# Task 2 starting
# Task 1 starting

# RACE 2: File access conflicts
{
    echo "Process 1" >> output.txt
} &
{
    echo "Process 2" >> output.txt
} &
wait
# output.txt content order unpredictable

# RACE 3: Resource contention
heavy_computation &
heavy_computation &
heavy_computation &
wait
# Timing varies based on system load

# RACE 4: Dependency violations
generate_input_data &
process_input_data &  # Depends on generate_input_data!
wait
# process_input_data may run before data is ready

# RACE 5: Exit status ambiguity
false &  # Fails immediately
true &   # Succeeds
wait $!  # Which job's exit status?
# Non-deterministic error handling
"#;

    let mut lexer = Lexer::new(race_conditions);
    if let Ok(tokens) = lexer.tokenize() {
        assert!(
            !tokens.is_empty(),
            "Race conditions should tokenize successfully"
        );
        let _ = tokens;
    }

    // Background jobs introduce RACE CONDITIONS
    // bashrs FORBIDS background jobs to prevent races
    // CRITICAL: Sequential execution is deterministic
}

#[test]
fn test_JOB_001_background_jobs_testing_implications() {
    // DOCUMENTATION: Background job testing implications (4 critical issues)
    //
    // ISSUE 1: Cannot assert on intermediate state
    // test_background_job() {
    //   process_data &
    //   # Cannot assert on process_data state here (still running!)
    //   wait
    // }
    // PROBLEM: Test cannot check state while background job runs
    //
    // ISSUE 2: Flaky tests due to timing
    // test_parallel_processing() {
    //   task1 & task2 & wait
    //   # Test may pass/fail depending on task completion order
    // }
    // PROBLEM: Tests are non-deterministic
    //
    // ISSUE 3: Cannot isolate failures
    // test_multiple_jobs() {
    //   job1 & job2 & job3 & wait
    //   # If one job fails, which one? Cannot tell!
    // }
    // PROBLEM: Cannot debug failures
    //
    // ISSUE 4: Cleanup issues
    // test_background_cleanup() {
    //   long_task &
    //   # Test exits before long_task completes
    //   # Background job becomes orphan
    // }
    // PROBLEM: Background jobs outlive tests, pollute environment

    let testing_implications = r#"
# BAD TEST: Cannot assert on intermediate state
test_bad_intermediate_state() {
    process_data &
    # PROBLEM: Cannot check if process_data is working
    # Job is still running, state is unknown
    wait
}

# GOOD TEST: Foreground execution (deterministic)
test_good_foreground() {
    process_data
    # Can assert on result after completion
    [ -f output.txt ] || exit 1
}

# BAD TEST: Flaky due to timing
test_flaky_parallel() {
    task1 &
    task2 &
    wait
    # PROBLEM: Order of completion is non-deterministic
    # Test may pass sometimes, fail others
}

# GOOD TEST: Sequential (deterministic)
test_deterministic_sequential() {
    task1
    task2
    # Order is guaranteed, reproducible
    [ -f task1.out ] || exit 1
    [ -f task2.out ] || exit 1
}

# BAD TEST: Cannot isolate failures
test_cannot_isolate() {
    job1 &
    job2 &
    job3 &
    wait
    # PROBLEM: If wait fails, which job failed?
}

# GOOD TEST: Isolated failures
test_isolated() {
    job1 || exit 1
    job2 || exit 2
    job3 || exit 3
    # Each job checked individually
}
"#;

    let mut lexer = Lexer::new(testing_implications);
    if let Ok(tokens) = lexer.tokenize() {
        assert!(
            !tokens.is_empty(),
            "Testing implications should tokenize successfully"
        );
        let _ = tokens;
    }

    // Background jobs make tests NON-REPRODUCIBLE and FLAKY
    // bashrs enforces DETERMINISTIC testing (foreground execution)
    // NEVER use background jobs in test code
}

#[test]
fn test_JOB_001_background_jobs_portability_issues() {
    // DOCUMENTATION: Background job portability issues (3 critical issues)
    //
    // ISSUE 1: Job control availability
    // Job control (&, jobs, fg, bg) may not be available in all shells
    // Non-interactive shells: job control often disabled
    // Dash: Limited job control support
    // POSIX: Job control is OPTIONAL (not all shells support it)
    //
    // ISSUE 2: wait behavior varies
    // bash: wait with no args waits for all background jobs
    // dash: wait requires PID (wait $pid)
    // POSIX: wait behavior varies across shells
    //
    // ISSUE 3: Background job process groups
    // bash: Background jobs in separate process group
    // dash: Process group handling differs
    // PROBLEM: Signal handling is shell-dependent

    let portability_issues = r#"
#!/bin/sh
# This script has PORTABILITY ISSUES (uses background jobs)

# ISSUE 1: Job control may not be available
long_task &
# Non-interactive shell: May not support job control
# Dash: Limited support

# ISSUE 2: wait behavior varies
task1 &
task2 &
wait  # bash: waits for all, dash: may require PID

# ISSUE 3: Process groups
task &
pid=$!
# Process group handling varies by shell

# PURIFIED (POSIX-compliant, portable):
# Use foreground execution (no job control needed)
task1
task2
# Deterministic, portable, works in all shells
"#;

    let mut lexer = Lexer::new(portability_issues);
    if let Ok(tokens) = lexer.tokenize() {
        assert!(
            !tokens.is_empty(),
            "Portability issues should tokenize successfully"
        );
        let _ = tokens;
    }

    // Background jobs have PORTABILITY ISSUES
    // Job control is OPTIONAL in POSIX (not all shells support)
    // PURIFICATION: Use foreground execution (portable, deterministic)
}

// DOCUMENTATION: Comprehensive background jobs comparison (Bash vs POSIX vs Purified)
//
// FEATURE                    | Bash       | POSIX      | Purified
// Background jobs (&)        | SUPPORTED  | OPTIONAL   | NOT SUPPORTED
// Determinism                | NO         | NO         | YES (enforced)
// Reproducibility            | NO         | NO         | YES
// Testing                    | Flaky      | Flaky      | Reproducible
// Portability                | bash       | Optional   | POSIX (portable)
// Error handling             | Silent     | Silent     | Immediate
// Race conditions            | YES        | YES        | NO
// Resource management        | Manual     | Manual     | Automatic
//
// RUST MAPPING:
// Background jobs (&) -> NOT MAPPED (use sequential execution)
// Parallelism needs -> Use Rayon (deterministic parallelism)
// Async I/O -> Use tokio (structured concurrency)
// Job control -> Remove or convert to sequential
//
// PURIFICATION RULES:
// 1. Background jobs (&) -> DISCOURAGED (convert to foreground)
// 2. Parallel tasks -> Sequential execution (deterministic)
// 3. wait command -> Remove (sequential execution doesn't need wait)
// 4. Fire-and-forget jobs -> Remove or make synchronous
// 5. Parallelism for performance -> Use make -j or Rayon (deterministic)
#[test]
fn test_JOB_001_background_jobs_comparison_table() {
    // Comparison examples: bash (non-deterministic) vs purified (sequential)
    let comparison_table = concat!(
        "#!/bin/sh\n",
        "# COMPARISON EXAMPLES\n",
        "\n",
        "# PURIFIED (DETERMINISTIC):\n",
        "# Sequential execution (deterministic)\n",
        "long_task\n",
        "short_task\n",
        "# Guaranteed order, reproducible\n",
        "\n",
        "# PURIFIED (reproducible tests):\n",
        "test_sequential() {\n",
        "    task1\n",
        "    task2\n",
        "    [ -f task1.out ] || exit 1\n",
        "    [ -f task2.out ] || exit 1\n",
        "}\n",
        "\n",
        "# PURIFIED (immediate error detection):\n",
        "risky_operation || exit 1\n",
    );

    let mut lexer = Lexer::new(comparison_table);
    if let Ok(tokens) = lexer.tokenize() {
        assert!(
            !tokens.is_empty(),
            "Comparison table should tokenize successfully"
        );
    }
}

// ============================================================================
// PARAM-SPEC-006: $- (Shell Options) Purification
// ============================================================================

// DOCUMENTATION: $- (shell options) is NOT SUPPORTED (LOW priority purification)
//
// $-: Special parameter that expands to current shell option flags
// Contains single letters representing active shell options
// Set by: Shell at startup, modified by set command
//
// WHAT $- CONTAINS (each letter = an active option):
// h: hashall, i: interactive, m: monitor mode, B: brace expansion,
// H: history substitution, s: read from stdin, c: read from -c arg,
// e: exit on error, u: error on unset vars, x: print commands,
// v: print input lines, n: no execution, f: no globbing,
// a: auto-export all, t: exit after one command
//
// EXAMPLE VALUES:
// Interactive bash: "himBH", Script: "hB", set -e script: "ehB", sh: "h"
//
// WHY NOT SUPPORTED:
// 1. Runtime-specific (value depends on how shell was invoked)
// 2. Non-deterministic (different shells = different flags)
// 3. Shell-dependent (bash has different flags than sh/dash)
// 4. Implementation detail (exposes internal shell state)
// 5. Not needed for pure scripts (purified scripts don't rely on shell modes)
//
// POSIX COMPLIANCE: $- is POSIX SUPPORTED but FLAGS DIFFER between shells
// bash: himBH (many extensions), sh/dash: h (minimal)
//
// PURIFICATION STRATEGY:
// 1. Remove $- entirely (RECOMMENDED)
// 2. Replace with explicit option checks
// 3. Use set -e explicitly (don't check "e" in $-)
//
// PURIFICATION EXAMPLES:
// BEFORE: echo "Shell options: $-"  ->  AFTER: (removed, not needed)
// BEFORE: `case "$-" in *i*) ... esac`  ->  AFTER: echo "Non-interactive"
// BEFORE: `case "$-" in *e*) ... esac`  ->  AFTER: set -e (explicit)
#[test]
fn test_PARAM_SPEC_006_shell_options_not_supported() {
    // $- is NOT SUPPORTED by the current lexer
    // Special parameters like $-, $$, $?, $! are not yet implemented
    // This test documents that $- is NOT SUPPORTED and verifies the lexer doesn't crash
    let bash_input = r#"echo $-"#;
    let mut lexer = Lexer::new(bash_input);
    let tokens = lexer.tokenize().unwrap();

    assert!(
        !tokens.is_empty(),
        "Lexer should produce tokens without crashing"
    );
}