#!/usr/bin/env python3
"""Shared helpers for the library-manager skill.

One place for the three things every script needs to agree on:

- the taxonomy  (typeid -> Class -> library-repo folder name), read from
  ``assets/template/Type_ID.xlsx`` so there is a single source of truth;
- the **per-typeid version store** (``assets/template/versions.json``) that holds each
  typeid's own ``template_version`` and ``skill_version`` - both start at 1 and both bump
  together the moment a parameter is added to that typeid (and nothing else moves);
- the part **tag** ``<MPN>_<make>_<typeid>`` that names every folder and column-A cell.

Keeping these here means fill_templates / append_parameter / gitea_components can't drift
apart on how a version is read or a folder is named.
"""
import json, os, re
import openpyxl

SKILL_ROOT   = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
TEMPLATE_DIR = os.path.join(SKILL_ROOT, "assets", "template")
TEMPLATE_XLSX= os.path.join(TEMPLATE_DIR, "template.xlsx")
TYPE_ID_XLSX = os.path.join(TEMPLATE_DIR, "Type_ID.xlsx")
VERSIONS_JSON= os.path.join(TEMPLATE_DIR, "versions.json")
CHANGELOG_XLSX = os.path.join(SKILL_ROOT, "assets", "CHANGELOG.xlsx")

# Fixed template columns that live on every sheet and are NOT extracted from a datasheet.
COL_TAG          = "MPN_make_type"     # column A header (the part tag lives here)
COL_SKILL_VER    = "Skill Version"     # column B  (per-typeid skill version, stamped by us)
COL_TEMPLATE_VER = "Template Version"  # column C  (per-typeid template version, stamped by us)
DESIGN_COLS      = ("Library Ref", "Library Path", "Footprint Ref", "Footprint Path")

# Raw taxonomy Class name -> clean, filesystem-safe folder name for the library repo.
# These match Vecmocon's established sheet-name convention (the old 18-class template).
CLASS_FOLDER = {
    "Resistor": "Resistor",
    "Capacitor": "Capacitor",
    "Inductor / Magnetics": "Inductor_Magnetics",
    "Diode": "Diode",
    "Transistor": "Transistor",
    "Integrated Circuit (IC)": "IC",
    "Protection Device": "Protection",
    "Power Conversion Module": "Power Conversion Module",
    "Relay / Contactor": "Relay_Contactor",
    "Switch / Button": "Switch_Button",
    "Connector": "Connector",
    "Antenna / RF": "Antenna_RF",
    "Crystal / Oscillator / Timing": "Crystal_Oscillator",
    "Battery / Cell": "Battery_Cell",
    "Audible / Indicator": "Audible_Indicator",
    "Display / HMI": "Display_HMI",
    "Sensor (discrete / module)": "Sensor",
    "Thermal / Cooling": "Thermal_Cooling",
}


def norm(s):
    return re.sub(r"[^a-z0-9]", "", str(s).lower())


# ---------------------------------------------------------------- taxonomy

def load_taxonomy(type_id_xlsx=TYPE_ID_XLSX):
    """Return {typeid: {"class": rawclass, "subclass": name, "folder": foldername}}.

    Reads the Type_ID.xlsx. A real mapping row has all three of Class / Subclass / Type ID;
    the group-header rows (only a Class label like 'Resistor   (12 types)') are skipped
    because they have no Type ID.
    """
    wb = openpyxl.load_workbook(type_id_xlsx, read_only=True, data_only=True)
    ws = wb[wb.sheetnames[0]]
    out = {}
    for row in ws.iter_rows(min_row=1, values_only=True):
        cells = (list(row) + [None, None, None])[:3]
        cls, sub, tid = (str(c).strip() if c is not None else "" for c in cells)
        if not tid or tid.lower() in ("type id",):
            continue
        folder = CLASS_FOLDER.get(cls, re.sub(r"\s*/\s*", "_", re.sub(r"\s*\(.*?\)", "", cls)).strip().replace(" ", "_"))
        out[tid] = {"class": cls, "subclass": sub, "folder": folder}
    return out


def class_folder(typeid, taxonomy=None):
    """The library-repo top-level folder name for a typeid (e.g. SCH -> 'Diode')."""
    tax = taxonomy or load_taxonomy()
    info = tax.get(typeid)
    return info["folder"] if info else None


# ---------------------------------------------------------------- part tag

def make_tag(manufacturer):
    """The 'make' token = first word of the manufacturer, stripped to alphanumerics."""
    w = re.split(r"\s+", str(manufacturer).strip())
    first = w[0] if w and w[0] else "NA"
    return re.sub(r"[^A-Za-z0-9]", "", first) or "NA"


def part_tag(part):
    """Identity of a part: <MPN>_<make>_<typeid>. Same tag = same part."""
    make = part.get("make") or make_tag(part.get("manufacturer", ""))
    return f'{part.get("mpn","")}_{make}_{part.get("typeid","NA")}'


def mpn_make_prefix(mpn, make):
    """The <MPN>_<make>_ prefix used for the early duplicate check (typeid not yet known)."""
    return f"{mpn}_{make}_"


# ---------------------------------------------------------------- version store

def _load_versions():
    if os.path.exists(VERSIONS_JSON):
        try:
            return json.load(open(VERSIONS_JSON, encoding="utf-8"))
        except Exception:
            pass
    return {}


def get_versions(typeid):
    """Return {'template_version': int, 'skill_version': int} for a typeid (default 1/1)."""
    v = _load_versions().get(typeid) or {}
    return {"template_version": int(v.get("template_version", 1)),
            "skill_version":    int(v.get("skill_version", 1))}


def version_labels(typeid):
    """Return ('vN', 'vN') = (skill_version, template_version) strings for stamping cells."""
    v = get_versions(typeid)
    return f'v{v["skill_version"]}', f'v{v["template_version"]}'


def bump_versions(typeid):
    """Increment BOTH template_version and skill_version for one typeid; persist and return
    (old, new) each as {'template_version','skill_version'}. Only this typeid changes."""
    data = _load_versions()
    cur = data.get(typeid) or {"template_version": 1, "skill_version": 1}
    old = {"template_version": int(cur.get("template_version", 1)),
           "skill_version":    int(cur.get("skill_version", 1))}
    new = {"template_version": old["template_version"] + 1,
           "skill_version":    old["skill_version"] + 1}
    data[typeid] = new
    json.dump(data, open(VERSIONS_JSON, "w", encoding="utf-8"), indent=2, sort_keys=True)
    return old, new


def init_versions(force=False):
    """Seed versions.json with 1/1 for every typeid in the taxonomy (idempotent)."""
    data = {} if force else _load_versions()
    for tid in load_taxonomy():
        data.setdefault(tid, {"template_version": 1, "skill_version": 1})
    json.dump(data, open(VERSIONS_JSON, "w", encoding="utf-8"), indent=2, sort_keys=True)
    return data


# ---------------------------------------------------------------- changelog (read)

CHANGELOG_HEADERS = ["Date", "Typeid", "Skill Version", "Template Version", "Description"]


def read_changelog():
    """All changelog rows as dicts (empty list if the changelog doesn't exist yet)."""
    if not os.path.exists(CHANGELOG_XLSX):
        return []
    wb = openpyxl.load_workbook(CHANGELOG_XLSX)
    ws = wb["Changelog"] if "Changelog" in wb.sheetnames else wb.active
    out = []
    for r in ws.iter_rows(min_row=2, values_only=True):
        if not r or all(c is None for c in r):
            continue
        r = list(r) + [None] * (5 - len(r))
        out.append({"date": r[0], "typeid": r[1], "skill": r[2],
                    "template": r[3], "description": r[4]})
    return out


def changelog_for_typeid(typeid):
    """Every recorded version change for one typeid, oldest first — the cumulative history
    (v1->v2, v2->v3, ...) that each part sheet of that typeid embeds as its Version History."""
    return [r for r in read_changelog() if str(r["typeid"]) == str(typeid)]


if __name__ == "__main__":
    import sys
    if len(sys.argv) > 1 and sys.argv[1] == "init":
        d = init_versions(force="--force" in sys.argv)
        print(f"versions.json seeded with {len(d)} typeids at {VERSIONS_JSON}")
    else:
        tax = load_taxonomy()
        print(f"taxonomy: {len(tax)} typeids, {len(set(v['folder'] for v in tax.values()))} class folders")