#!/usr/bin/env bash
set -uo pipefail

SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
SCRIPT="$SCRIPT_DIR/../scripts/mp3-to-mp4"
PASS=0
FAIL=0
GREEN='\033[0;32m'
RED='\033[0;31m'
RESET='\033[0m'

pass() { echo -e "${GREEN}PASS${RESET}: $1"; ((PASS++)); }
fail() { echo -e "${RED}FAIL${RESET}: $1 — $2"; ((FAIL++)); }

# Create a short test mp3 using ffmpeg (1 second of silence)
TMPDIR=$(mktemp -d)
trap 'rm -rf "$TMPDIR"' EXIT

TEST_MP3="$TMPDIR/test.mp3"
TEST_IMG="$TMPDIR/test.png"
ffmpeg -y -f lavfi -i anullsrc=r=44100:cl=mono -t 1 -q:a 9 "$TEST_MP3" 2>/dev/null
ffmpeg -y -f lavfi -i "color=c=blue:s=320x240:d=1" -frames:v 1 "$TEST_IMG" 2>/dev/null

# --- Tests ---

# Help flag
desc="--help exits 0 and shows usage"
out=$("$SCRIPT" --help 2>&1)
if [[ $? -eq 0 ]] && echo "$out" | grep -q "Usage:"; then
    pass "$desc"
else
    fail "$desc" "exit code or output unexpected"
fi

# Missing input file
desc="missing input exits 1"
out=$("$SCRIPT" -t "Test" 2>&1)
if [[ $? -ne 0 ]] && echo "$out" | grep -qi "error"; then
    pass "$desc"
else
    fail "$desc" "expected error exit"
fi

# Missing title
desc="missing --title exits 1"
out=$("$SCRIPT" "$TEST_MP3" 2>&1)
if [[ $? -ne 0 ]] && echo "$out" | grep -qi "title"; then
    pass "$desc"
else
    fail "$desc" "expected error about title"
fi

# File not found
desc="non-existent file exits 1"
out=$("$SCRIPT" -t "Test" /tmp/nonexistent_audio_12345.mp3 2>&1)
if [[ $? -ne 0 ]] && echo "$out" | grep -qi "not found"; then
    pass "$desc"
else
    fail "$desc" "expected file not found error"
fi

# Dryrun shows expected fields
desc="--dryrun shows all expected fields"
out=$("$SCRIPT" --dryrun -t "My Title" "$TEST_MP3" 2>&1)
if [[ $? -eq 0 ]] \
    && echo "$out" | grep -q "\[dryrun\] Input:" \
    && echo "$out" | grep -q "\[dryrun\] Output:" \
    && echo "$out" | grep -q "\[dryrun\] Title:.*My Title" \
    && echo "$out" | grep -q "\[dryrun\] Duration:" \
    && echo "$out" | grep -q "\[dryrun\] Resolution:.*1920x1080" \
    && echo "$out" | grep -q "\[dryrun\] Font size:.*72" \
    && echo "$out" | grep -q "\[dryrun\] Would generate"; then
    pass "$desc"
else
    fail "$desc" "missing expected dryrun fields"
    echo "  Output was:"
    echo "$out" | sed 's/^/    /'
fi

# Dryrun with custom options
desc="--dryrun respects custom options"
out=$("$SCRIPT" --dryrun -t "Custom" -r 1280x720 --font-size 48 --font-color yellow --bg-color blue "$TEST_MP3" 2>&1)
if [[ $? -eq 0 ]] \
    && echo "$out" | grep -q "Resolution:.*1280x720" \
    && echo "$out" | grep -q "Font size:.*48" \
    && echo "$out" | grep -q "Font color:.*yellow" \
    && echo "$out" | grep -q "Background:.*blue"; then
    pass "$desc"
else
    fail "$desc" "custom options not reflected"
    echo "  Output was:"
    echo "$out" | sed 's/^/    /'
fi

# Dryrun with custom output
desc="--dryrun respects -o output path"
out=$("$SCRIPT" --dryrun -t "Test" -o /tmp/custom.mp4 "$TEST_MP3" 2>&1)
if [[ $? -eq 0 ]] && echo "$out" | grep -q "Output:.*custom.mp4"; then
    pass "$desc"
else
    fail "$desc" "custom output not shown"
fi

# Dryrun with --image shows image as background
desc="--dryrun with --image shows image path"
out=$("$SCRIPT" --dryrun -t "Test" -i "$TEST_IMG" "$TEST_MP3" 2>&1)
if [[ $? -eq 0 ]] && echo "$out" | grep -q "Background:.*test.png.*(image)"; then
    pass "$desc"
else
    fail "$desc" "expected image path in background"
    echo "  Output was:"
    echo "$out" | sed 's/^/    /'
fi

# Image not found
desc="--image with non-existent file exits 1"
out=$("$SCRIPT" -t "Test" -i /tmp/nonexistent_img_12345.png "$TEST_MP3" 2>&1)
if [[ $? -ne 0 ]] && echo "$out" | grep -qi "image not found"; then
    pass "$desc"
else
    fail "$desc" "expected image not found error"
fi

# Default output replaces .mp3 with .mp4
desc="default output replaces .mp3 with .mp4"
out=$("$SCRIPT" --dryrun -t "Test" "$TEST_MP3" 2>&1)
if echo "$out" | grep -q "Output:.*test.mp4"; then
    pass "$desc"
else
    fail "$desc" "expected test.mp4 in output"
fi

# --- Summary ---
echo ""
echo "Results: $PASS passed, $FAIL failed"
[[ $FAIL -eq 0 ]] && exit 0 || exit 1