"""Generate deterministic SFT preview data for Objectverse Diary."""

from __future__ import annotations

import argparse
import json
import sys
from collections.abc import Mapping, Sequence
from pathlib import Path

PROJECT_ROOT = Path(__file__).resolve().parents[1]
if str(PROJECT_ROOT) not in sys.path:
    sys.path.insert(0, str(PROJECT_ROOT))

from src.config import PERSONALITY_MODES
from src.examples import EXAMPLE_OBJECTS
from src.pipeline import generate_object_diary


DEFAULT_OUTPUT_PATH = Path("data/train/objectverse_sft_preview.jsonl")
DEFAULT_COUNT = 60

SYSTEM_PROMPT = (
    "You are Objectverse Diary, an English-first small-model assistant. "
    "Given structured object understanding and a requested personality mode, "
    "return JSON containing a consistent hidden object persona and a short diary."
)

SCENE_VARIANTS = [
    "after a long day of being ignored",
    "beside half-finished notes",
    "under warm desk light",
    "near a quiet morning window",
    "during a suspiciously ordinary afternoon",
    "while humans rush past without noticing",
    "after surviving another minor household crisis",
    "beside a charging cable and old receipts",
    "in the corner of a room that knows too much",
    "before anyone remembers to clean it",
]


def build_sft_records(count: int = DEFAULT_COUNT) -> list[dict[str, object]]:
    if count < 1:
        raise ValueError("count must be at least 1")

    records: list[dict[str, object]] = []
    for index in range(count):
        example = EXAMPLE_OBJECTS[index % len(EXAMPLE_OBJECTS)]
        mode = _mode_for_index(example, index)
        description = _description_for_index(example, index)
        result = generate_object_diary(
            image_path=None,
            description=description,
            mode=mode,
            save=False,
            trace_id=f"sft-preview-{index + 1:04d}",
        )
        assistant_payload = {
            "persona": result.persona.persona.model_dump(mode="json"),
            "diary": result.diary.model_dump(mode="json"),
        }
        record = {
            "id": f"sft-preview-{index + 1:04d}",
            "source": "objectverse-diary-mock-mvp",
            "split": "preview",
            "mode": mode,
            "object_description": description,
            "object_understanding": result.object_understanding.model_dump(mode="json"),
            "messages": [
                {"role": "system", "content": SYSTEM_PROMPT},
                {
                    "role": "user",
                    "content": _user_prompt(
                        result.object_understanding.model_dump(mode="json"),
                        mode,
                    ),
                },
                {
                    "role": "assistant",
                    "content": json.dumps(assistant_payload, ensure_ascii=False),
                },
            ],
        }
        records.append(record)

    return records


def write_sft_jsonl(records: Sequence[Mapping[str, object]], output_path: Path) -> Path:
    output_path.parent.mkdir(parents=True, exist_ok=True)
    lines = [json.dumps(record, ensure_ascii=False, sort_keys=True) for record in records]
    output_path.write_text("\n".join(lines) + "\n", encoding="utf-8")
    return output_path


def generate_dataset(output_path: Path = DEFAULT_OUTPUT_PATH, count: int = DEFAULT_COUNT) -> Path:
    return write_sft_jsonl(build_sft_records(count), output_path)


def _mode_for_index(example: Mapping[str, str], index: int) -> str:
    base_mode = example["mode"]
    base_index = PERSONALITY_MODES.index(base_mode) if base_mode in PERSONALITY_MODES else 0
    return PERSONALITY_MODES[(base_index + index) % len(PERSONALITY_MODES)]


def _description_for_index(example: Mapping[str, str], index: int) -> str:
    scene = SCENE_VARIANTS[index % len(SCENE_VARIANTS)]
    return f"{example['description']}, {scene}"


def _user_prompt(object_understanding: Mapping[str, object], mode: str) -> str:
    payload = json.dumps(object_understanding, ensure_ascii=False, sort_keys=True)
    return (
        f"Personality mode: {mode}\n"
        f"Object understanding JSON: {payload}\n"
        "Return JSON with keys persona and diary."
    )


def _parse_args() -> argparse.Namespace:
    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument("--count", type=int, default=DEFAULT_COUNT)
    parser.add_argument("--output", type=Path, default=DEFAULT_OUTPUT_PATH)
    return parser.parse_args()


def main() -> None:
    args = _parse_args()
    output_path = generate_dataset(args.output, args.count)
    print(f"wrote {args.count} SFT preview records to {output_path}")


if __name__ == "__main__":
    main()