#!/usr/bin/env python3
"""Run the bounded continuous flow-latent encoder pilot."""

from __future__ import annotations

import argparse
from pathlib import Path
from typing import Sequence

from music3lab.codec.flow_encoder import canonical_json_bytes
from music3lab.codec.runner import (
    generate_teacher_dataset,
    load_teacher_dataset,
    recover_teacher_dataset,
    train_flow_encoder,
    verify_pilot_bundle,
)


def _common(parser: argparse.ArgumentParser) -> None:
    parser.add_argument("--config", type=Path, required=True)
    parser.add_argument("--snapshot", type=Path, required=True)
    parser.add_argument("--base-manifest", type=Path, required=True)
    parser.add_argument("--diffusers-root", type=Path, required=True)


def _parser() -> argparse.ArgumentParser:
    parser = argparse.ArgumentParser(
        description=(
            "Predict continuous Music 3 Flow-VAE renderer latents from "
            "waveforms; this does not produce native RVQ tokens."
        )
    )
    commands = parser.add_subparsers(dest="command", required=True)

    generate = commands.add_parser("generate-teachers")
    _common(generate)
    generate.add_argument("--dataset-root", type=Path, required=True)

    recover = commands.add_parser("recover-teachers")
    _common(recover)
    recover.add_argument("--quarantine-root", type=Path, required=True)
    recover.add_argument("--producer-commit", required=True)
    recover.add_argument("--dataset-root", type=Path, required=True)

    train = commands.add_parser("train")
    _common(train)
    train.add_argument("--dataset-root", type=Path, required=True)
    train.add_argument("--external-wav", type=Path, required=True)
    train.add_argument("--output-root", type=Path, required=True)

    run = commands.add_parser("run")
    _common(run)
    run.add_argument("--dataset-root", type=Path, required=True)
    run.add_argument("--external-wav", type=Path, required=True)
    run.add_argument("--output-root", type=Path, required=True)

    verify_data = commands.add_parser("verify-teachers")
    verify_data.add_argument("--dataset-root", type=Path, required=True)

    verify_run = commands.add_parser("verify")
    verify_run.add_argument("--output-root", type=Path, required=True)
    return parser


def _generate(arguments: argparse.Namespace) -> dict[str, object]:
    manifest = generate_teacher_dataset(
        config_path=arguments.config,
        snapshot=arguments.snapshot,
        base_manifest=arguments.base_manifest,
        diffusers_root=arguments.diffusers_root,
        output_root=arguments.dataset_root,
    )
    return {
        "kind": "continuous_flow_latent_teachers",
        "native_rvq": False,
        "dataset_root": str(arguments.dataset_root.absolute()),
        "manifest_semantic_digest": manifest.semantic_digest,
        "split_counts": {
            key: value.count for key, value in manifest.splits.items()
        },
    }


def _recover(arguments: argparse.Namespace) -> dict[str, object]:
    manifest = recover_teacher_dataset(
        config_path=arguments.config,
        quarantine_root=arguments.quarantine_root,
        producer_project_git_commit=arguments.producer_commit,
        snapshot=arguments.snapshot,
        base_manifest=arguments.base_manifest,
        diffusers_root=arguments.diffusers_root,
        output_root=arguments.dataset_root,
    )
    return {
        "kind": "continuous_flow_latent_teachers",
        "native_rvq": False,
        "dataset_root": str(arguments.dataset_root.absolute()),
        "manifest_semantic_digest": manifest.semantic_digest,
        "producer_project_git_commit": manifest.producer_project_git_commit,
        "publication_project_git_commit": (
            manifest.publication_project_git_commit
        ),
        "recovered_from_complete_quarantine": True,
        "replay_exact_count": manifest.replay_exact_count,
    }


def _train(arguments: argparse.Namespace) -> dict[str, object]:
    metrics = train_flow_encoder(
        config_path=arguments.config,
        dataset_root=arguments.dataset_root,
        snapshot=arguments.snapshot,
        base_manifest=arguments.base_manifest,
        diffusers_root=arguments.diffusers_root,
        external_wav=arguments.external_wav,
        output_root=arguments.output_root,
    )
    return {
        "kind": "continuous_flow_latent_encoder_pilot",
        "native_rvq_capability": metrics.native_rvq_capability,
        "measured_improvement_gate": metrics.measured_improvement_gate,
        "metrics_semantic_digest": metrics.semantic_digest,
        "output_root": str(arguments.output_root.absolute()),
    }


def main(argv: Sequence[str] | None = None) -> int:
    arguments = _parser().parse_args(argv)
    if arguments.command == "generate-teachers":
        result = _generate(arguments)
    elif arguments.command == "recover-teachers":
        result = _recover(arguments)
    elif arguments.command == "train":
        result = _train(arguments)
    elif arguments.command == "run":
        dataset = _generate(arguments)
        result = {"dataset": dataset, "pilot": _train(arguments)}
    elif arguments.command == "verify-teachers":
        dataset = load_teacher_dataset(arguments.dataset_root)
        result = {
            "kind": "continuous_flow_latent_teachers",
            "native_rvq": False,
            "manifest_semantic_digest": dataset.manifest.semantic_digest,
            "split_counts": {
                key: value.count
                for key, value in dataset.manifest.splits.items()
            },
        }
    elif arguments.command == "verify":
        metrics = verify_pilot_bundle(arguments.output_root)
        result = {
            "kind": "continuous_flow_latent_encoder_pilot",
            "native_rvq_capability": metrics.native_rvq_capability,
            "measured_improvement_gate": metrics.measured_improvement_gate,
            "metrics_semantic_digest": metrics.semantic_digest,
        }
    else:
        raise AssertionError("unreachable command")
    print(canonical_json_bytes(result).decode("utf-8"), end="")
    return 0


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