#!/usr/bin/env bats
# Tests for lib/common.sh — core utilities

load test_helper.sh

setup() {
    source_lib common.sh
}

# ── PROJECT_ROOT detection ───────────────────────────────

@test "PROJECT_ROOT points to a directory containing Makefile" {
    [ -f "$PROJECT_ROOT/Makefile" ]
}

@test "PROJECT_ROOT is not the filesystem root" {
    [ "$PROJECT_ROOT" != "/" ]
}

# ── is_cmd ───────────────────────────────────────────────

@test "is_cmd: bash exists" {
    run is_cmd bash
    assert_success
}

@test "is_cmd: nonexistent command fails" {
    run is_cmd this_command_does_not_exist_xyz123
    assert_failure
}

@test "is_cmd: empty argument fails" {
    run is_cmd ""
    assert_failure
}

# ── timestamp ────────────────────────────────────────────

@test "timestamp: returns YYYYMMDD-HHMMSS format" {
    run timestamp
    assert_success
    [[ "$output" =~ ^[0-9]{8}-[0-9]{6}$ ]]
}

@test "timestamp: returns a reasonable date (not epoch)" {
    local ts
    ts="$(timestamp)"
    local year="${ts:0:4}"
    (( year >= 2025 ))
}

# ── data_dir ─────────────────────────────────────────────

@test "data_dir: creates directory and returns path" {
    local subdir="test-bats-$$-$RANDOM"
    local dir
    dir="$(data_dir "$subdir")"
    [ -d "$dir" ]
    rmdir "$dir" 2>/dev/null || true
}

@test "data_dir: returns path under PROJECT_ROOT/data" {
    local dir
    dir="$(data_dir "testdir")"
    [[ "$dir" == "$PROJECT_ROOT/data/testdir" ]]
    rmdir "$dir" 2>/dev/null || true
}

# ── logging functions produce output ─────────────────────

@test "log_info: produces output" {
    run log_info "test message"
    assert_success
    assert_output --partial "test message"
}

@test "log_success: produces output" {
    run log_success "it worked"
    assert_success
    assert_output --partial "it worked"
}

@test "log_warn: produces output" {
    run log_warn "warning"
    assert_success
    assert_output --partial "warning"
}

@test "log_error: produces output on stderr" {
    run log_error "failure"
    assert_success
    # log_error writes to stderr but bats captures both
    assert_output --partial "failure"
}

@test "log_header: produces output with delimiters" {
    run log_header "Section Title"
    assert_success
    assert_output --partial "Section Title"
}

# ── Color handling ───────────────────────────────────────

@test "colors are empty strings when not a terminal" {
    export TERM=dumb
    # Re-source to pick up non-terminal detection
    unset RED GREEN YELLOW BLUE CYAN BOLD DIM RESET
    source_lib common.sh
    # When stdout is not a tty (as in bats), colors should be empty
    [ -z "$RED" ]
}

# ── require_root ─────────────────────────────────────────

@test "require_root: exits with error when not root" {
    # We're not running tests as root
    if [ "$EUID" -eq 0 ]; then
        skip "Test must not run as root"
    fi
    run require_root
    assert_failure
    assert_output --partial "root"
}