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"""Build manifest.csv and data_dictionary.json for a BubbleID-Flow release."""

from __future__ import annotations

import argparse
import csv
import hashlib
import json
import re
from pathlib import Path

import pandas as pd


RELEASE_VERSION = "1.0.0"
MANIFEST_NAME = "manifest.csv"


def sha256(path: Path) -> str:
    digest = hashlib.sha256()
    with path.open("rb") as stream:
        for chunk in iter(lambda: stream.read(1024 * 1024), b""):
            digest.update(chunk)
    return digest.hexdigest()


def canonical_case(path: str) -> str:
    for case in ("5gs_22C", "10gs_22C", "15gs_20C", "25gs_20C"):
        if case in path:
            return case
    if "15gs_22C" in path:
        return "15gs_20C"
    if "25gs_22C" in path:
        return "25gs_20C"
    return "all_cases"


def file_class(path: str) -> str:
    lower = path.lower()
    if lower.startswith("annotatedimages/"):
        return "annotation_image" if lower.endswith(".bmp") else "labelme_annotation"
    if lower.startswith("modelweights/"):
        return "model_checkpoint"
    if "/images/" in lower:
        return "raw_optical_image" if lower.endswith(".bmp") else "camera_metadata"
    if "/flowloopthermaldata/" in lower:
        return "derived_thermal_plot" if lower.endswith(".png") else "thermal_workbook"
    if "/acousticdatta/" in lower:
        if lower.endswith(".wfs"):
            return "raw_ae_waveform"
        if lower.endswith(".dta"):
            return "ae_acquisition_export"
        if lower.endswith(".txt") and "/plot_" not in lower:
            return "ae_text_record"
        if lower.endswith(".png"):
            return "derived_ae_plot"
    if lower.startswith("videos/"):
        return "derived_presentation_video" if lower.endswith(".mp4") else "video_provenance"
    if lower.startswith("processing/"):
        return "processing_snapshot"
    if lower.startswith("calibration/"):
        return "calibration_evidence_record"
    return "release_metadata"


def thermal_field_definition(name: str) -> dict[str, str]:
    unit_match = re.search(r"\[([^]]+)\]", name)
    unit = unit_match.group(1) if unit_match else "dimensionless or not stated"
    if name.startswith("Time"):
        meaning = "Source time field; its absolute origin is not documented."
    elif "Mass Flow" in name:
        meaning = "Measured or source-reduced mass-flow field."
    elif "Pressure" in name:
        meaning = "Measured or source-reduced pressure field."
    elif "Temperature" in name or "Subcooling" in name or "Saturation" in name:
        meaning = "Measured or source-reduced temperature-related field."
    elif "Heat Flux" in name or "Heat Transfer" in name or "Heat Rate" in name or "Power" in name:
        meaning = "Source-reduced thermal performance field; calibration and heat-loss evidence are not included."
    elif "Quality" in name:
        meaning = "Source-reduced vapor-quality field; its reconstruction assumptions are not documented in this release."
    elif "Friction" in name:
        meaning = "Source-reduced friction-factor field; not used as a validated manuscript endpoint."
    else:
        meaning = "Source workbook field; see the original header for its source label."
    return {"name": name, "dtype": "numeric unless source cell is blank", "unit": unit, "definition": meaning}


def read_thermal_schemas(root: Path) -> list[dict[str, object]]:
    schemas: list[dict[str, object]] = []
    seen: set[str] = set()
    for workbook in sorted(root.rglob("*.xlsx")):
        if workbook.name.endswith("_IN_with_units.xlsx"):
            kind = "thermal_input_workbook"
        elif workbook.name.endswith("_u_with_units.xlsx"):
            kind = "thermal_auxiliary_workbook"
        else:
            kind = "thermal_reduced_workbook"
        if kind in seen:
            continue
        frame = pd.read_excel(workbook)
        schemas.append(
            {
                "file_class": kind,
                "example_path": workbook.relative_to(root.parent.parent).as_posix(),
                "shape": f"variable rows x {len(frame.columns)} columns",
                "missing_value_rule": "Blank Excel cells represent missing source values; no numeric sentinel is documented.",
                "fields": [thermal_field_definition(str(column)) for column in frame.columns],
            }
        )
        seen.add(kind)
    return schemas


def build_dictionary(root: Path) -> dict[str, object]:
    thermal_root = root / "MultimodalData" / "FlowLoopThermalData"
    return {
        "title": "BubbleID-Flow Multimodal Flow-Boiling Dataset Data Dictionary",
        "schema_version": RELEASE_VERSION,
        "global_missing_value_rule": "No dataset-wide numeric sentinel is defined. Blank spreadsheet cells and absent optional JSON keys are missing values.",
        "schemas": [
            {
                "file_class": "annotation_image",
                "paths": ["AnnotatedImages/*.bmp"],
                "format": "BMP grayscale image",
                "shape": "1024 x 1024 pixels",
                "fields": [],
            },
            {
                "file_class": "labelme_annotation",
                "paths": ["AnnotatedImages/*.json"],
                "format": "LabelMe JSON",
                "fields": [
                    {"name": "version", "dtype": "string", "unit": "not applicable", "definition": "LabelMe file-format version."},
                    {"name": "flags", "dtype": "object", "unit": "not applicable", "definition": "Optional LabelMe image-level flags."},
                    {"name": "shapes[].label", "dtype": "string", "unit": "not applicable", "definition": "Manual region label: bubble or bubble_cluster."},
                    {"name": "shapes[].points", "dtype": "array[vertex,2]", "unit": "pixel", "definition": "Polygon vertices in source-image pixel coordinates."},
                    {"name": "shapes[].shape_type", "dtype": "string", "unit": "not applicable", "definition": "LabelMe geometry type."},
                    {"name": "imagePath", "dtype": "string", "unit": "not applicable", "definition": "Paired source BMP filename."},
                    {"name": "imageHeight", "dtype": "integer", "unit": "pixel", "definition": "Source-image height."},
                    {"name": "imageWidth", "dtype": "integer", "unit": "pixel", "definition": "Source-image width."},
                ],
            },
            {
                "file_class": "raw_optical_image",
                "paths": ["MultimodalData/Images/<case>/<state>/*.bmp"],
                "format": "BMP grayscale image",
                "shape": "1024 x 1024 pixels",
                "fields": [],
            },
            {
                "file_class": "camera_metadata",
                "paths": ["MultimodalData/Images/<case>/<state>/*.cihx"],
                "format": "camera metadata XML",
                "fields": [],
                "missing_value_rule": "Use camera-vendor metadata fields as supplied; no normalized schema is released.",
            },
            *read_thermal_schemas(thermal_root),
            {
                "file_class": "ae_text_record",
                "paths": ["MultimodalData/AcousticDatta/<case>/HIT_*.TXT", "MultimodalData/AcousticDatta/<case>/TIME_*.TXT"],
                "format": "EasyAE fixed-width text export",
                "shape": "variable rows x vendor-defined fields",
                "missing_value_rule": "No numeric sentinel is documented by the export.",
                "fields": [
                    {"name": "ID", "dtype": "integer", "unit": "not applicable", "definition": "EasyAE record identifier."},
                    {"name": "SSSSSSSS.mmmuuun", "dtype": "float", "unit": "s", "definition": "EasyAE source time field; absolute origin is not documented."},
                    {"name": "PARA1, PARA2", "dtype": "float", "unit": "vendor-defined", "definition": "EasyAE source fields; units are not documented in this release."},
                    {"name": "CH", "dtype": "integer", "unit": "channel", "definition": "EasyAE acquisition channel identifier."},
                    {"name": "RISE, COUN, ENER, DURATION, A-FRQ, RMS, PCNTS, THR, R-FRQ, I-FRQ, SIG STRNGTH, ABS-ENERGY, FRQ-C, P-FRQ, AMP, ASL", "dtype": "numeric", "unit": "vendor-defined", "definition": "EasyAE event or continuous-summary fields retained with the vendor labels; calibration and unit definitions are not included."},
                ],
            },
            {
                "file_class": "raw_ae_waveform",
                "paths": ["MultimodalData/AcousticDatta/<case>/Raw Data/*.wfs"],
                "format": "EasyAE waveform binary",
                "shape": "vendor-defined binary waveform sequence",
                "fields": [],
                "missing_value_rule": "Not applicable; decode with a compatible WFS decoder.",
            },
            {
                "file_class": "ae_acquisition_export",
                "paths": ["MultimodalData/AcousticDatta/<case>/Raw Data/*.DTA"],
                "format": "EasyAE text acquisition export",
                "shape": "variable rows x vendor-defined fields",
                "fields": [],
            },
            {
                "file_class": "model_checkpoint",
                "paths": ["ModelWeights/model_final.pth"],
                "format": "PyTorch checkpoint",
                "shape": "model parameter tensors",
                "fields": [],
            },
            {
                "file_class": "derived_presentation_video",
                "paths": ["Videos/*.mp4"],
                "format": "MP4 presentation video",
                "shape": "1920 x 720 pixels, 5 frames/s, 80 frames for the included 45 V videos",
                "fields": [],
                "missing_value_rule": "Not applicable; the videos are derived visual summaries, not native-time records.",
            },
        ],
    }


def write_manifest(root: Path, version: str) -> int:
    output = root / MANIFEST_NAME
    files = [path for path in root.rglob("*") if path.is_file() and path != output]
    with output.open("w", newline="", encoding="utf-8") as stream:
        writer = csv.DictWriter(stream, fieldnames=["path", "case_identifier", "file_class", "byte_size", "sha256", "release_version"])
        writer.writeheader()
        for path in sorted(files):
            relative = path.relative_to(root).as_posix()
            writer.writerow(
                {
                    "path": relative,
                    "case_identifier": canonical_case(relative),
                    "file_class": file_class(relative),
                    "byte_size": path.stat().st_size,
                    "sha256": sha256(path),
                    "release_version": version,
                }
            )
    return len(files)


def main() -> None:
    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument("--dataset-root", type=Path, required=True)
    parser.add_argument("--version", default=RELEASE_VERSION)
    args = parser.parse_args()
    root = args.dataset_root
    if not root.is_dir():
        raise FileNotFoundError(root)
    (root / "data_dictionary.json").write_text(json.dumps(build_dictionary(root), indent=2), encoding="utf-8")
    count = write_manifest(root, args.version)
    print(f"Wrote data_dictionary.json and {MANIFEST_NAME} for {count} files.")


if __name__ == "__main__":
    main()