backend/renderer.py

import os
import tempfile
import subprocess
from pathlib import Path
from fastapi import UploadFile

_QUALITY = {"l": "l", "m": "m", "h": "h", "u": "u"}

def _save_upload(tmpdir: Path, file: UploadFile) -> Path:
    ext = Path(file.filename or "file").suffix.lower()
    out = tmpdir / f"input{ext}"
    with out.open("wb") as f:
        f.write(file.file.read())
    return out

def _gen_scene_py(path: Path, anim: str, duration: float, bg_color: str) -> Path:
    is_svg = path.suffix.lower() == ".svg"
    safe_path = repr(str(path))

    if anim == "draw" and not is_svg:
        raise ValueError("Draw modu yalnızca SVG kabul eder.")

    head = f"""from manim import *

class LogoScene(Scene):
    def construct(self):
        self.camera.background_color = "{bg_color}"
"""

    if anim == "draw":
        # Fill'leri kapat + stroke yoksa hafif bir stroke ata + parçalı çiz
        body = f"""
        m = SVGMobject({safe_path}, should_center=True).set_height(5).move_to(ORIGIN)

        # family_members_with_points: gerçekten çizilebilir alt-objeler
        for sm in m.family_members_with_points():
            # fill kapalı başlasın ki Create sırasında sadece çizgi görünsün
            sm.set_fill(opacity=0)
            # stroke yoksa otomatik ver (birçok SVG'de yalnızca fill var)
            if sm.get_stroke_width() == 0:
                sm.set_stroke(color=WHITE, width=3, opacity=1)

        # parçalı çizim (birbirinin üstüne binecek şekilde)
        self.play(
            LaggedStartMap(Create, m.family_members_with_points(), lag_ratio=0.04, rate_func=linear),
            run_time={float(duration)}
        )

        # çizim bittikten sonra dolguları geri getir
        self.play(m.animate.set_fill(opacity=1), run_time=0.6)
        self.wait(0.2)
        """
    else:
        loader = (
            f'SVGMobject({safe_path}, should_center=True).set_height(5)'
            if is_svg else
            f'ImageMobject({safe_path}).scale(0.9)'
        )
        body_start = f"""m = {loader}
m.move_to(ORIGIN)
"""

        if anim == "fade":
            body_anim = f"""
self.play(FadeIn(m), run_time=max(0.3, {float(duration)}*0.5))
self.wait(0.1)
self.play(FadeOut(m), run_time=max(0.2, {float(duration)}*0.3))
"""
        elif anim == "spin":
            body_anim = f"""
self.play(FadeIn(m, scale=0.8), run_time=max(0.2, {float(duration)}*0.2))
self.play(Rotate(m, angle=2*PI), rate_func=linear, run_time=max(0.4, {float(duration)}*0.6))
self.play(FadeOut(m), run_time=max(0.1, {float(duration)}*0.2))
"""
        elif anim == "bounce":
            body_anim = f"""
from manim import UP, DOWN, there_and_back
self.play(FadeIn(m, shift=UP*3), run_time=max(0.2, {float(duration)}*0.25))
self.play(m.animate.shift(DOWN*3).scale(1.02), rate_func=there_and_back, run_time=max(0.4, {float(duration)}*0.55))
self.play(FadeOut(m), run_time=max(0.15, {float(duration)}*0.2))
"""
        else:
            raise ValueError("Geçersiz animasyon tipi.")

        body = body_start + body_anim

    code = head + body + "\n"
    scene_py = path.parent / "logo_scene.py"
    scene_py.write_text(code, encoding="utf-8")
    return scene_py

def _run_manim(scene_py: Path, quality: str) -> Path:
    q = _QUALITY.get(quality, "m")
    tmpdir = scene_py.parent
    out_name = "out.mp4"

    cmd = [
        "manim", "-q", q,
        str(scene_py), "LogoScene",
        "-o", out_name,
        "--format=mp4",
        "--media_dir", str(tmpdir),
    ]

    proc = subprocess.run(cmd, cwd=tmpdir, capture_output=True, text=True)
    if proc.returncode != 0:
        raise RuntimeError(f"Manim failed: {proc.stderr or proc.stdout}")

    for root, _, files in os.walk(tmpdir):
        if out_name in files:
            return Path(root) / out_name

    raise RuntimeError("Çıktı mp4 bulunamadı.")

async def render_logo(file: UploadFile, animation: str, duration: float, bg_color: str, quality: str) -> Path:
    with tempfile.TemporaryDirectory() as tdir:
        tdir = Path(tdir)
        input_path = _save_upload(tdir, file)
        scene_py = _gen_scene_py(input_path, animation, duration, bg_color)
        mp4 = _run_manim(scene_py, quality)
        final_dir = Path("/tmp/manim_out")
        final_dir.mkdir(parents=True, exist_ok=True)
        final_path = final_dir / mp4.name
        final_path.write_bytes(mp4.read_bytes())
        return final_path