"""
HF Spaces version of generate.py — same logic, paths adapted for /tmp/Wan2GP.
Called as a subprocess from app.py inside @spaces.GPU.
"""

import argparse
import os
import sys
from pathlib import Path

WAN2GP_ROOT = Path(os.environ.get("WAN2GP_ROOT", "/tmp/Wan2GP"))

MODEL_SHORTHANDS = {
    "sulphur-2": "sulphur_2_base",
}

DEFAULTS = {
    "sulphur_2_base": {
        "num_inference_steps": 8,
        "guidance_scale":      5.0,
        "resolution":          "832x480",
        "video_length":        81,
    },
}


def p(*args, **kwargs):
    print(*args, **kwargs, flush=True)


def parse_args():
    ap = argparse.ArgumentParser()
    ap.add_argument("--image",          required=True)
    ap.add_argument("--prompt",         required=True)
    ap.add_argument("--output",         required=True)
    ap.add_argument("--model",          default="sulphur-2")
    ap.add_argument("--steps",          type=int,   default=None)
    ap.add_argument("--guidance_scale", type=float, default=None)
    ap.add_argument("--frames",         type=int,   default=None)
    ap.add_argument("--resolution",     default=None)
    ap.add_argument("--seed",           type=int,   default=-1)
    return ap.parse_args()


def main():
    args = parse_args()

    model_type = MODEL_SHORTHANDS.get(args.model, args.model)
    defaults   = DEFAULTS.get(model_type, DEFAULTS["sulphur_2_base"])

    image_path = str(Path(args.image.strip()).resolve())
    if not Path(image_path).exists():
        print(f"Fatal: image not found: {image_path}", flush=True)
        sys.exit(1)

    resolution = args.resolution or defaults["resolution"]
    if not args.resolution:
        try:
            from PIL import Image as _PIL
            img = _PIL.open(image_path)
            iw, ih = img.size
            if ih > iw:
                tw = 480
                th = round(ih / iw * tw / 32) * 32
            else:
                th = 480
                tw = round(iw / ih * th / 32) * 32
            resolution = f"{tw}x{th}"
            p(f"Auto-detected resolution: {resolution} (from {iw}x{ih} input)")
        except Exception:
            pass

    task = {
        "model_type":           model_type,
        "base_model_type":      model_type,
        "prompt":               args.prompt,
        "image_start":          image_path,
        "num_inference_steps":  args.steps         or defaults["num_inference_steps"],
        "guidance_scale":       args.guidance_scale or defaults["guidance_scale"],
        "resolution":           resolution,
        "video_length":         args.frames        or defaults["video_length"],
        "seed":                 args.seed,
        "image_prompt_type":    "S",
        "input_video_strength": 1.0,
        "activated_loras": [
            "ltx-2.3-22b-distilled-lora-1.1_fro90_ceil72_condsafe.safetensors",
        ],
        "loras_multipliers": ["0.5"],
    }

    p(f"Model:      {model_type}")
    p(f"Image:      {image_path}")
    p(f"Steps:      {task['num_inference_steps']}  Guidance: {task['guidance_scale']}")
    p(f"Resolution: {task['resolution']}  Frames: {task['video_length']}")
    p(f"Prompt:     {args.prompt[:80]}")

    sys.path.insert(0, str(WAN2GP_ROOT))
    os.chdir(WAN2GP_ROOT)

    from shared.api import WanGPSession

    output_dir = Path(args.output).parent
    output_dir.mkdir(parents=True, exist_ok=True)

    p("Starting session...")
    session = WanGPSession(root=WAN2GP_ROOT, output_dir=output_dir, console_output=True)

    p("Running generation...")
    result = session.run_task(task)

    output_file = None

    if result.artifacts:
        src = result.artifacts[0].path
        if src and Path(src).exists():
            output_file = src

    # Fallback: scan the output dir for any video file Wan2GP may have written
    if output_file is None:
        candidates = sorted(output_dir.glob("**/*.mp4"), key=lambda f: f.stat().st_mtime, reverse=True)
        if candidates:
            output_file = str(candidates[0])
            p(f"Found output via dir scan: {output_file}")

    if output_file:
        import shutil
        shutil.copy2(output_file, args.output)
        p(f"Done: {args.output}")
    else:
        p(f"No output found in {output_dir}")
        if result.errors:
            p(f"Errors: {result.errors}")
        sys.exit(1)

    session.close()


if __name__ == "__main__":
    main()