"""
Build paced hero reel from the browser-ordered clip list.
- Shot 1 (family entry): trimmed to 3s — cuts before mud pan
- Shots 2-7: full 6s (establish the story)
- Shots 8-12: trimmed to 3.5s (building pace)
- Shots 13-15: trimmed to 2.5s (rapid)
- Shot 16 (final reveal): full 6s (hold on clean result)
"""
import os, subprocess, shutil

BASE_DIR = os.path.dirname(os.path.dirname(__file__))
VID_DIR  = os.path.join(BASE_DIR, "assets", "videos", "hero", "clips")
REEL_OUT = os.path.join(BASE_DIR, "assets", "videos", "hero", "hero-reel.mp4")
TMP_DIR  = os.path.join(VID_DIR, "paced-tmp")
os.makedirs(TMP_DIR, exist_ok=True)

# Clip order: wine spill > extraction > stain > technician, stairs later
CLIPS = [
    "v3-shot-02",              # 1  - wine spill on sofa
    "shot-05-extraction-couch",# 2  - extraction couch
    "shot-03-technician",      # 3  - technician
    "v3-shot-03",              # 4  - dirty stained carpet close-up
    "v3-shot-06",              # 5  - living room clean carpet pan
    "v3-shot-07",              # 6  - restaurant carpet glide
    "v3-shot-05",              # 7  - office lobby carpet pan
    "v2-shot-05-clean-stairs", # 8  - clean bright staircase
    "v2-shot-07-restaurant",   # 9  - restaurant carpet
    "v2-shot-06-office",       # 10 - bright office carpet
    "shot-01-wide-room",       # 11 - wide room establishing
    "shot-05-clean-reveal",    # 12 - clean reveal
    "shot-04-extraction-carpet",# 13 - final reveal
]

# Duration for each clip
DURATIONS = [
    4.5,   # 1  wine spill — cut at 4.5s
    5.0,   # 2
    5.0,   # 3
    4.0,   # 4  --- building pace ---
    4.0,   # 5
    4.0,   # 6
    3.5,   # 7
    3.5,   # 8
    2.5,   # 9  --- rapid ---
    2.5,   # 10
    2.5,   # 11
    2.5,   # 12
    6.0,   # 13 final reveal — hold
]

paced_clips = []
for i, (name, dur) in enumerate(zip(CLIPS, DURATIONS)):
    src = os.path.join(VID_DIR, f"{name}.mp4")
    out = os.path.join(TMP_DIR, f"{i:02d}-{name}.mp4")
    if not os.path.exists(src):
        print(f"  MISSING: {src}")
        continue
    print(f"[{i+1:02d}] {name} → {dur}s")
    result = subprocess.run(
        ["ffmpeg", "-y", "-i", src, "-t", str(dur),
         "-c:v", "libx264", "-crf", "22", "-preset", "fast", out],
        capture_output=True, text=True
    )
    if result.returncode != 0:
        print(f"  ffmpeg error: {result.stderr[-200:]}")
    else:
        paced_clips.append(out)

print(f"\n{len(paced_clips)}/{len(CLIPS)} clips trimmed")

concat_file = os.path.join(TMP_DIR, "concat.txt")
with open(concat_file, "w") as f:
    for p in paced_clips:
        f.write(f"file '{p}'\n")

result = subprocess.run(
    ["ffmpeg", "-y", "-f", "concat", "-safe", "0", "-i", concat_file,
     "-c:v", "libx264", "-crf", "22", "-preset", "fast", "-movflags", "+faststart", REEL_OUT],
    capture_output=True, text=True
)
if result.returncode == 0:
    print(f"Reel saved: {REEL_OUT} ({os.path.getsize(REEL_OUT)//1024}KB)")
    # Clean up tmp
    shutil.rmtree(TMP_DIR)
    print("Done.")
else:
    print(f"ffmpeg error: {result.stderr[-400:]}")