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"""CLI for standalone agentic Cosmos3 text-to-image prompt upsampling."""

from __future__ import annotations

import argparse
import json
from pathlib import Path

from agentic_upsampling.clients import (
    ImageGenerationClient,
    PromptRewriterClient,
    VLMQualityJudge,
    read_api_token,
    read_optional_generation_auth_key,
)
from agentic_upsampling.constants import (
    DEFAULT_ASPECT_RATIO,
    DEFAULT_CRITIC_ENDPOINT_URL,
    DEFAULT_CRITIC_MODEL,
    DEFAULT_FLOW_SHIFT,
    DEFAULT_GENERATION_AUTH_KEY_ENV,
    DEFAULT_GENERATION_EXTRA_ARGS,
    DEFAULT_GENERATION_MODEL,
    DEFAULT_GEMINI_API_KEY_ENV,
    DEFAULT_GUIDANCE,
    DEFAULT_IMAGE_SIZE,
    DEFAULT_LLM_EXTRA_BODY,
    DEFAULT_MAX_ITERATIONS,
    DEFAULT_NUM_STEPS,
    DEFAULT_OPENAI_API_KEY_ENV,
    DEFAULT_RESOLUTION,
    DEFAULT_REWRITER_ENDPOINT_URL,
    DEFAULT_REWRITER_MODEL,
    DEFAULT_SAMPLES_PER_ITERATION,
    DEFAULT_UPSAMPLER_ENDPOINT_URL,
    DEFAULT_UPSAMPLER_MODEL,
)
from agentic_upsampling.data import load_prompt_items
from agentic_upsampling.extract_best import extract_best_images
from agentic_upsampling.io_utils import write_json_atomic
from agentic_upsampling.runner import AgenticUpsamplerRunner, RunnerConfig, write_run_manifest


def parse_args() -> argparse.Namespace:
    parser = argparse.ArgumentParser(description=__doc__)
    input_group = parser.add_mutually_exclusive_group(required=True)
    input_group.add_argument("--prompt", default=None, help="Single text prompt to run.")
    input_group.add_argument("--prompts", type=Path, default=None, help="Path to .txt, .jsonl, or .csv prompts.")
    parser.add_argument("--limit", type=int, default=None, help="Optional maximum number of prompts to run.")
    parser.add_argument("--output-dir", type=Path, required=True)
    parser.add_argument("--overwrite", action="store_true")
    parser.add_argument("--max-iterations", type=int, default=DEFAULT_MAX_ITERATIONS)
    parser.add_argument("--samples-per-iteration", type=int, default=DEFAULT_SAMPLES_PER_ITERATION)
    parser.add_argument("--seed-base", type=int, default=None)
    parser.add_argument("--disable-early-stop", action="store_true")
    parser.add_argument("--quiet", action="store_true")
    parser.add_argument("--extract-best", action="store_true", help="Copy best images after the run finishes.")

    parser.add_argument("--generation-endpoint", required=True)
    parser.add_argument("--generation-model", default=DEFAULT_GENERATION_MODEL)
    parser.add_argument("--size", default=DEFAULT_IMAGE_SIZE, help="vLLM-Omni image size in WIDTHxHEIGHT format.")
    parser.add_argument("--generation-auth-key", default="")
    parser.add_argument("--generation-auth-key-env", default=DEFAULT_GENERATION_AUTH_KEY_ENV)
    parser.add_argument("--resolution", default=DEFAULT_RESOLUTION)
    parser.add_argument("--aspect-ratio", default=DEFAULT_ASPECT_RATIO)
    parser.add_argument("--num-steps", type=int, default=DEFAULT_NUM_STEPS)
    parser.add_argument("--guidance", type=float, default=DEFAULT_GUIDANCE)
    parser.add_argument("--flow-shift", type=float, default=DEFAULT_FLOW_SHIFT)
    parser.add_argument("--generation-extra-args", type=json.loads, default=DEFAULT_GENERATION_EXTRA_ARGS)

    parser.add_argument("--upsampler-endpoint-url", default=DEFAULT_UPSAMPLER_ENDPOINT_URL)
    parser.add_argument("--upsampler-model", default=DEFAULT_UPSAMPLER_MODEL)
    parser.add_argument("--rewriter-endpoint-url", default=DEFAULT_REWRITER_ENDPOINT_URL)
    parser.add_argument("--rewriter-model", default=DEFAULT_REWRITER_MODEL)
    parser.add_argument("--openai-api-key-env", default=DEFAULT_OPENAI_API_KEY_ENV)
    parser.add_argument("--openai-api-key-file", type=Path, default=None)
    parser.add_argument("--llm-extra-body", type=json.loads, default=DEFAULT_LLM_EXTRA_BODY)
    parser.add_argument("--initial-negative-prompt", default="")

    parser.add_argument("--critic-endpoint-url", default=DEFAULT_CRITIC_ENDPOINT_URL)
    parser.add_argument("--critic-model", default=DEFAULT_CRITIC_MODEL)
    parser.add_argument("--gemini-api-key-env", default=DEFAULT_GEMINI_API_KEY_ENV)
    parser.add_argument("--gemini-api-key-file", type=Path, default=None)
    return parser.parse_args()


def main() -> int:
    args = parse_args()
    args.output_dir.mkdir(parents=True, exist_ok=True)

    items = load_prompt_items(prompt=args.prompt, prompts_path=args.prompts, limit=args.limit)
    if not items:
        raise RuntimeError("No prompts selected.")
    if args.samples_per_iteration < 1:
        raise ValueError("--samples-per-iteration must be >= 1.")
    if not isinstance(args.generation_extra_args, dict):
        raise ValueError("--generation-extra-args must decode to a JSON object.")

    openai_token = read_api_token(args.openai_api_key_env, args.openai_api_key_file)
    gemini_token = read_api_token(args.gemini_api_key_env, args.gemini_api_key_file)
    generation_auth_key = read_optional_generation_auth_key(args.generation_auth_key, args.generation_auth_key_env)

    write_json_atomic(
        args.output_dir / "run_config.json",
        {
            "selected_prompts": len(items),
            "max_iterations": args.max_iterations,
            "samples_per_iteration": args.samples_per_iteration,
            "early_stop": not args.disable_early_stop,
            "generation_endpoint": args.generation_endpoint,
            "generation_model": args.generation_model,
            "size": args.size,
            "resolution": args.resolution,
            "aspect_ratio": args.aspect_ratio,
            "num_steps": args.num_steps,
            "guidance": args.guidance,
            "flow_shift": args.flow_shift,
            "generation_extra_args": args.generation_extra_args,
            "upsampler_endpoint_url": args.upsampler_endpoint_url,
            "upsampler_model": args.upsampler_model,
            "rewriter_endpoint_url": args.rewriter_endpoint_url,
            "rewriter_model": args.rewriter_model,
            "llm_extra_body": args.llm_extra_body,
            "critic_endpoint_url": args.critic_endpoint_url,
            "critic_model": args.critic_model,
            "initial_negative_prompt": args.initial_negative_prompt,
        },
    )

    rewriter = PromptRewriterClient(
        api_token=openai_token,
        upsampler_endpoint_url=args.upsampler_endpoint_url,
        upsampler_model=args.upsampler_model,
        rewriter_endpoint_url=args.rewriter_endpoint_url,
        rewriter_model=args.rewriter_model,
        extra_body=args.llm_extra_body,
        resolution=args.resolution,
        aspect_ratio=args.aspect_ratio,
    )
    generator = ImageGenerationClient(
        endpoint=args.generation_endpoint,
        auth_key=generation_auth_key,
        model=args.generation_model,
        size=args.size,
        num_steps=args.num_steps,
        guidance=args.guidance,
        flow_shift=args.flow_shift,
        extra_args=args.generation_extra_args,
    )
    judge = VLMQualityJudge(
        api_token=gemini_token,
        endpoint_url=args.critic_endpoint_url,
        model=args.critic_model,
    )
    runner = AgenticUpsamplerRunner(
        rewriter=rewriter,
        generator=generator,
        judge=judge,
        config=RunnerConfig(
            output_dir=args.output_dir,
            max_iterations=args.max_iterations,
            samples_per_iteration=args.samples_per_iteration,
            overwrite=args.overwrite,
            seed_base=args.seed_base,
            initial_negative_prompt=args.initial_negative_prompt,
            early_stop=not args.disable_early_stop,
            verbose=not args.quiet,
        ),
    )

    results = [runner.run_item_safely(item) for item in items]
    write_run_manifest(args.output_dir, results)
    failures = sum(1 for item in results if item.get("error"))
    summary = {"selected_prompts": len(items), "completed": len(items) - failures, "failures": failures}
    write_json_atomic(args.output_dir / "summary.json", summary)
    print(json.dumps(summary, indent=2), flush=True)

    if args.extract_best and not failures:
        export_dir = args.output_dir / "best_generations"
        extract_best_images(args.output_dir, export_dir, overwrite=args.overwrite)
        print(f"Exported best images to {export_dir}", flush=True)
    return 1 if failures else 0


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