#!/usr/bin/env python3
"""Run the full video pipeline: generate, merge, and concatenate."""

from __future__ import annotations

import argparse
import logging
import os
import subprocess
import sys
from pathlib import Path

from src.scripts.logging_config import configure_logging
from src.scripts.s3_video_storage import S3VideoStorage


PROJECT_ROOT = Path(__file__).resolve().parent
SCRIPT_DIR = PROJECT_ROOT / "src" / "scripts"
DEFAULT_BASE_DIR = PROJECT_ROOT
DEFAULT_HUNYUAN_DIR = DEFAULT_BASE_DIR / "HunyuanVideo-1.5"
DEFAULT_REEL_SCRIPT = DEFAULT_BASE_DIR / "reel_script.json"
DEFAULT_IMAGES_DIR = DEFAULT_BASE_DIR / "images"
DEFAULT_VIDEOS_DIR = DEFAULT_BASE_DIR / "videos"
DEFAULT_AUDIOS_DIR = DEFAULT_BASE_DIR / "audios"
DEFAULT_MERGED_DIR = DEFAULT_BASE_DIR / "merged"
DEFAULT_OUTPUT = DEFAULT_BASE_DIR / "results" / "final_output.mp4"

LOGGER = logging.getLogger(__name__)


def parse_args() -> argparse.Namespace:
    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument("--base-dir", type=Path, default=DEFAULT_BASE_DIR)
    parser.add_argument("--hunyuan-dir", type=Path, default=DEFAULT_HUNYUAN_DIR)
    parser.add_argument("--reel-script", type=Path, default=DEFAULT_REEL_SCRIPT)
    parser.add_argument("--images-dir", type=Path, default=DEFAULT_IMAGES_DIR)
    parser.add_argument("--videos-dir", type=Path, default=DEFAULT_VIDEOS_DIR)
    parser.add_argument("--audios-dir", type=Path, default=DEFAULT_AUDIOS_DIR)
    parser.add_argument("--merged-dir", type=Path, default=DEFAULT_MERGED_DIR)
    parser.add_argument("--output", type=Path, default=DEFAULT_OUTPUT)
    parser.add_argument("--seed", type=int, default=1)
    parser.add_argument("--skip-generate", action="store_true")
    parser.add_argument("--skip-merge", action="store_true")
    parser.add_argument("--skip-concat", action="store_true")
    parser.add_argument("--skip-s3-upload", action="store_true")
    parser.add_argument("--log-level", default="INFO")
    return parser.parse_args()


def run_step(name: str, cmd: list[str], cwd: Path | None = None) -> None:
    LOGGER.info("=== %s ===", name)
    LOGGER.info("$ %s", " ".join(str(part) for part in cmd))
    if cwd is not None:
        LOGGER.info("(cwd: %s)", cwd)
    subprocess.run(cmd, check=True, cwd=str(cwd) if cwd else None)


def maybe_upload_to_s3(output_path: Path) -> None:
    bucket = os.getenv("AWS_S3_BUCKET")
    if not bucket:
        LOGGER.warning("Skipping S3 upload: AWS_S3_BUCKET is not set")
        return

    storage = S3VideoStorage(
        {
            "bucket_name": bucket,
            "region_name": os.getenv("AWS_REGION"),
            "endpoint_url": os.getenv("AWS_S3_ENDPOINT_URL"),
            "aws_access_key_id": os.getenv("AWS_ACCESS_KEY_ID"),
            "aws_secret_access_key": os.getenv("AWS_SECRET_ACCESS_KEY"),
            "aws_session_token": os.getenv("AWS_SESSION_TOKEN"),
        }
    )
    s3_uri = storage.store_file(output_path)
    LOGGER.info("Uploaded output to %s", s3_uri)


def main() -> int:
    args = parse_args()
    configure_logging(args.log_level)

    # If only base-dir is overridden, derive the common subpaths from it.
    if args.base_dir != DEFAULT_BASE_DIR:
        if args.hunyuan_dir == DEFAULT_HUNYUAN_DIR:
            args.hunyuan_dir = args.base_dir / "HunyuanVideo-1.5"
        if args.reel_script == DEFAULT_REEL_SCRIPT:
            args.reel_script = args.base_dir / "reel_script.json"
        if args.images_dir == DEFAULT_IMAGES_DIR:
            args.images_dir = args.base_dir / "images"
        if args.videos_dir == DEFAULT_VIDEOS_DIR:
            args.videos_dir = args.base_dir / "videos"
        if args.audios_dir == DEFAULT_AUDIOS_DIR:
            args.audios_dir = args.base_dir / "audios"
        if args.merged_dir == DEFAULT_MERGED_DIR:
            args.merged_dir = args.base_dir / "merged"
        if args.output == DEFAULT_OUTPUT:
            args.output = args.base_dir / "results" / "final_output.mp4"

    try:
        if not args.skip_generate and not args.reel_script.exists():
            run_step(
                "Generate Reel Script",
                [
                    sys.executable,
                    str(SCRIPT_DIR / "generate_script.py"),
                ],
                cwd=args.base_dir,
            )
            if not args.reel_script.exists():
                LOGGER.error("Reel script was not generated at %s", args.reel_script)
                return 1

        if not args.skip_generate:
            run_step(
                "Generate Videos",
                [
                    sys.executable,
                    str(SCRIPT_DIR / "generate_videos.py"),
                    "--hunyuan-dir",
                    str(args.hunyuan_dir),
                    "--reel-script",
                    str(args.reel_script),
                    "--images-dir",
                    str(args.images_dir),
                    "--videos-dir",
                    str(args.videos_dir),
                    "--audios-dir",
                    str(args.audios_dir),
                    "--seed",
                    str(args.seed),
                ],
            )

        if not args.skip_merge:
            run_step(
                "Merge Audio + Video",
                [
                    sys.executable,
                    str(SCRIPT_DIR / "merge_audio_video.py"),
                    "--videos-dir",
                    str(args.videos_dir),
                    "--audios-dir",
                    str(args.audios_dir),
                    "--output-dir",
                    str(args.merged_dir),
                ],
            )

        if not args.skip_concat:
            run_step(
                "Concatenate Merged Videos",
                [
                    sys.executable,
                    str(SCRIPT_DIR / "concat_merged.py"),
                    "--merged-dir",
                    str(args.merged_dir),
                    "--output",
                    str(args.output),
                ],
            )
    except subprocess.CalledProcessError as exc:
        LOGGER.exception("Pipeline failed at command: %s", exc.cmd)
        return exc.returncode

    if not args.skip_s3_upload:
        try:
            maybe_upload_to_s3(args.output)
        except Exception:
            LOGGER.exception("Failed uploading output to S3")
            return 1

    LOGGER.info("Pipeline complete")
    LOGGER.info("Final output: %s", args.output)
    return 0


if __name__ == "__main__":
    raise SystemExit(main())