"""Command line interface.

    boxsim decode   file.bpj            raw INI payload
    boxsim extract  file.bpj            structured JSON model
    boxsim netlist  file.bpj            crossover netlist
    boxsim build    file.bpj outdir/    a KiCad 10 project
"""

from __future__ import annotations

import argparse
import json
import sys
from pathlib import Path

from . import catalog as catalog_mod
from . import container, ini, model
from . import project as project_mod
from . import symbols as symbols_mod
from .model import Project


def _add_library_args(p: argparse.ArgumentParser) -> None:
    p.add_argument(
        "--library",
        help="path to the kicad-visaton-lib checkout or its Visaton.kicad_sym "
        "(default: $BOXSIM_KICAD_LIB, else the copy bundled with this tool)",
    )
    p.add_argument(
        "--catalog",
        help="path to Visatonteile.txt (default: $BOXSIM_CATALOG, else the "
        "copy bundled with this tool)",
    )


def _read(path: str) -> bytes:
    p = Path(path)
    if not p.exists():
        raise SystemExit(f"boxsim: {path}: no such file")
    return p.read_bytes()


def _load_project(path: str) -> tuple[Project, str]:
    raw = _read(path)
    doc = ini.parse(container.decode_text(raw))
    return model.from_ini(doc), Path(path).stem


def cmd_decode(args: argparse.Namespace) -> int:
    raw = _read(args.file)
    if args.oracle:
        from . import _oracle

        payload = _oracle.decode_bpj(raw)
    else:
        payload = container.decode(raw)
    if args.output:
        Path(args.output).write_bytes(payload)
        print(f"{args.file}: {len(payload)} bytes -> {args.output}")
    else:
        sys.stdout.buffer.write(payload)
    return 0


def _model_to_dict(project: Project, resolutions=None) -> dict:
    by_slot = {r.part.slot: r for r in (resolutions or [])}
    out: dict = {
        "version": project.version,
        "amp_count": project.amp_count,
        "chassis_count": project.chassis_count,
        "comments": project.comments,
        "chassis": [
            {
                "index": c.index,
                "name": c.name,
                "comment": c.comment,
                "re_ohm": c.re,
                "fs_hz": c.fs,
                "vas_m3": c.vas,
                "qes": c.qes,
                "qms": c.qms,
            }
            for c in project.chassis
        ],
        "enclosures": [
            {"index": e.index, "type": e.typ, "vb_m3": e.vb, "fb_hz": e.fb}
            for e in project.enclosures
        ],
        "baffles": [
            {"index": b.index, "width_m": b.width, "height_m": b.height,
             "shared_enclosure": b.shared}
            for b in project.baffles
        ],
        "crossovers": [],
    }
    for xo in project.crossovers:
        netlist = xo.build_netlist()
        parts = []
        for p in xo.parts:
            entry = {
                "slot": p.slot,
                "type": p.typ.name.lower(),
                "orientation": p.orientation.name.lower(),
                "row": p.row,
                "col": p.col,
                "nodes": [p.node_a, p.node_b],
                "nets": [netlist.net_of(p.node_a), netlist.net_of(p.node_b)],
            }
            if p.value is not None:
                entry["value_si"] = p.value
            if p.label:
                entry["series"] = p.label
            if p.dcr is not None:
                entry["dcr_ohm"] = p.dcr
            if p.chassis_index is not None:
                entry["chassis_index"] = p.chassis_index
            if p.inverted:
                entry["inverted"] = True
            res = by_slot.get(p.slot)
            if res is not None:
                entry["symbol"] = res.symbol
                entry["value_text"] = res.value_text
                if res.notes:
                    entry["notes"] = res.notes
            parts.append(entry)
        out["crossovers"].append(
            {
                "index": xo.index,
                "component_count": len(xo.components),
                "wire_count": len(xo.wires),
                "net_count": netlist.net_count,
                "dangling_nets": netlist.dangling(),
                "parts": parts,
            }
        )
    return out


def cmd_extract(args: argparse.Namespace) -> int:
    project, _ = _load_project(args.file)
    resolutions = None
    if not args.no_symbols:
        try:
            cat, lib = project_mod.load_parts(args.catalog, args.library)
            resolver = symbols_mod.Resolver(cat, lib)
            resolutions = [
                r
                for xo in project.crossovers
                for r in resolver.resolve_all(xo.components)
            ]
        except (symbols_mod.SymbolError, catalog_mod.CatalogError) as exc:
            print(f"boxsim: symbol resolution skipped: {exc}", file=sys.stderr)
    payload = json.dumps(_model_to_dict(project, resolutions), indent=2, sort_keys=False)
    if args.output:
        Path(args.output).write_text(payload + "\n", encoding="utf-8")
        print(f"{args.file} -> {args.output}")
    else:
        print(payload)
    return 0


def cmd_netlist(args: argparse.Namespace) -> int:
    project, _ = _load_project(args.file)
    for xo in project.crossovers:
        netlist = xo.build_netlist()
        print(f"# crossover {xo.index}: {len(xo.components)} components, "
              f"{netlist.net_count} nets")
        groups: dict[int, list[str]] = {}
        for p in xo.components:
            label = f"Part{p.slot}({p.typ.name.lower()}"
            label += f" {p.value:g})" if p.value is not None else ")"
            for node in (p.node_a, p.node_b):
                groups.setdefault(netlist.net_of(node), []).append(label)
        for net in sorted(groups):
            print(f"  net {net:3d}: {', '.join(sorted(groups[net]))}")
        dangling = netlist.dangling()
        if dangling:
            print(f"  WARNING dangling nets: {dangling}")
    return 0


def cmd_build(args: argparse.Namespace) -> int:
    project, name = _load_project(args.file)
    try:
        cat, lib = project_mod.load_parts(args.catalog, args.library)
    except (symbols_mod.SymbolError, catalog_mod.CatalogError) as exc:
        raise SystemExit(f"boxsim: {exc}") from exc

    extras = symbols_mod.cross_check(cat, lib)
    if extras and args.verbose:
        print(f"note: library has {len(extras)} symbol(s) Boxsim cannot select: "
              f"{', '.join(extras)}")

    outdir = Path(args.outdir)
    try:
        result = project_mod.build(
            project, args.name or name, outdir, cat, lib, pitch=args.pitch
        )
    except (symbols_mod.SymbolError, NotImplementedError) as exc:
        raise SystemExit(f"boxsim: {exc}") from exc

    print(f"{result.schematic.name}: {len(result.sheet.placements)} symbols, "
          f"{len(result.sheet.wires)} wires, {len(result.sheet.junctions)} junctions, "
          f"paper {result.sheet.paper}")
    for note in result.notes:
        print(f"  note: {note}")

    if args.verify:
        from . import verify as verify_mod

        try:
            gate = verify_mod.run_gate(
                result.schematic, project.crossovers[0], result.sheet.placements
            )
        except verify_mod.VerifyError as exc:
            raise SystemExit(f"boxsim: {exc}") from exc
        for m in gate.messages:
            print(f"  {m}")
        status = "PASS" if gate.ok else "FAIL"
        print(f"  gate {status}: KiCad {gate.kicad_version}, ERC "
              f"{'clean' if gate.erc_ok else 'failed'}, netlist "
              f"{'matches' if gate.netlist_matches else 'differs'} "
              f"({len(gate.reference_nets)} nets)")
        if not gate.ok:
            return 1
    return 0


def build_parser() -> argparse.ArgumentParser:
    ap = argparse.ArgumentParser(
        prog="boxsim",
        description="Read Boxsim loudspeaker projects and turn their crossovers "
        "into KiCad projects.",
    )
    sub = ap.add_subparsers(dest="command", required=True)

    p = sub.add_parser("decode", help="write the raw INI payload of a container")
    p.add_argument("file")
    p.add_argument("-o", "--output")
    p.add_argument(
        "--oracle",
        action="store_true",
        help="decode by emulating Boxsim.exe instead (development only)",
    )
    p.set_defaults(func=cmd_decode)

    p = sub.add_parser("extract", help="write the structured project model as JSON")
    p.add_argument("file")
    p.add_argument("-o", "--output")
    p.add_argument(
        "--no-symbols", action="store_true", help="skip KiCad symbol resolution"
    )
    _add_library_args(p)
    p.set_defaults(func=cmd_extract)

    p = sub.add_parser("netlist", help="print the crossover netlist")
    p.add_argument("file")
    p.set_defaults(func=cmd_netlist)

    p = sub.add_parser("build", help="write a KiCad project")
    p.add_argument("file")
    p.add_argument("outdir")
    p.add_argument("--name", help="project name (default: input file stem)")
    p.add_argument(
        "--pitch", type=float, default=None,
        help="grid pitch in mm (default 25.4, must exceed 22.86)",
    )
    p.add_argument(
        "--verify", action="store_true",
        help="run ERC and compare the extracted netlist against Boxsim "
        "(requires kicad-cli 10)",
    )
    p.add_argument("-v", "--verbose", action="store_true")
    _add_library_args(p)
    p.set_defaults(func=cmd_build)
    return ap


def main(argv: list[str] | None = None) -> int:
    ap = build_parser()
    args = ap.parse_args(argv)
    if getattr(args, "pitch", None) is None and args.command == "build":
        from .schematic import DEFAULT_PITCH_MM

        args.pitch = DEFAULT_PITCH_MM
    try:
        return args.func(args)
    except (container.ContainerError, model.ModelError) as exc:
        raise SystemExit(f"boxsim: {exc}") from exc


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