"""
Schematic editing tools for modifying existing elements in KiCad schematics.

Complements the creation-oriented tools in schematic.py with modification,
removal, and annotation capabilities.

Also includes s-expression-direct tools (e.g. ``remove_wires_by_criteria``)
that bypass the schematic engine for operations that work directly on the
s-expression tree.
"""

import logging
from typing import Any

from mckicad.server import mcp
from mckicad.utils.sch_helpers import expand as _expand
from mckicad.utils.sch_helpers import load_schematic, validate_schematic_path as _validate_schematic_path
from mckicad.utils.sexp_parser import (
    parse_wire_segments,
    remove_sexp_blocks_by_uuid,
)

logger = logging.getLogger(__name__)


def _get_schematic_engine() -> str:
    return "sch_document"


# ---------------------------------------------------------------------------
# Tools
# ---------------------------------------------------------------------------


@mcp.tool()
def modify_component(
    schematic_path: str,
    reference: str,
    x: float | None = None,
    y: float | None = None,
    rotation: float | None = None,
    value: str | None = None,
    footprint: str | None = None,
    properties: dict[str, str] | None = None,
    in_bom: bool | None = None,
    on_board: bool | None = None,
) -> dict[str, Any]:
    """Edit an existing component in a KiCad schematic.

    Supports moving, rotating, changing value/footprint, updating arbitrary
    properties, and toggling BOM/board inclusion -- all in a single call.
    Only the parameters you provide will be changed; everything else is left
    untouched.

    Args:
        schematic_path: Path to an existing .kicad_sch file.
        reference: Reference designator of the component to modify (e.g. ``R1``, ``U3``).
        x: New X position. Must be provided together with ``y`` to move.
        y: New Y position. Must be provided together with ``x`` to move.
        rotation: New rotation angle in degrees (e.g. 0, 90, 180, 270).
        value: New value string (e.g. ``4.7k``, ``100nF``).
        footprint: New footprint identifier (e.g. ``Resistor_SMD:R_0603_1608Metric``).
        properties: Dictionary of property names to values to set or update.
        in_bom: Set to True/False to include or exclude the component from BOM output.
        on_board: Set to True/False to include or exclude the component on the PCB.

    Returns:
        Dictionary with ``success``, ``reference``, ``modified`` list, and ``engine``.
    """
    verr = _validate_schematic_path(schematic_path)
    if verr:
        return verr
    schematic_path = _expand(schematic_path)

    if not reference:
        return {"success": False, "error": "reference must be a non-empty string"}

    # Validate that move coordinates come in pairs
    if (x is None) != (y is None):
        return {
            "success": False,
            "error": "Both x and y must be provided together to move a component",
        }

    try:
        sch = load_schematic(schematic_path)
        comp = sch.components.get(reference)
        if comp is None:
            return {
                "success": False,
                "error": f"Component '{reference}' not found in schematic",
                "schematic_path": schematic_path,
            }
        modified: list[str] = []

        if x is not None and y is not None:
            comp.move(x, y)
            modified.append(f"position=({x}, {y})")

        if rotation is not None:
            comp.rotate(rotation)
            modified.append(f"rotation={rotation}")

        if value is not None:
            comp.set_value(value)
            modified.append(f"value={value}")

        if footprint is not None:
            comp.set_footprint(footprint)
            modified.append(f"footprint={footprint}")

        if properties:
            for key, val in properties.items():
                comp.set_property(key, val)
                modified.append(f"property[{key}]={val}")

        if in_bom is not None:
            comp.set_in_bom(in_bom)
            modified.append(f"in_bom={in_bom}")

        if on_board is not None:
            comp.set_on_board(on_board)
            modified.append(f"on_board={on_board}")

        if not modified:
            return {
                "success": True,
                "reference": reference,
                "modified": [],
                "note": "No changes requested -- component left unchanged",
                "schematic_path": schematic_path,
                "engine": _get_schematic_engine(),
            }

        sch.save(schematic_path)

        logger.info("Modified %s in %s: %s", reference, schematic_path, ", ".join(modified))
        return {
            "success": True,
            "reference": reference,
            "modified": modified,
            "schematic_path": schematic_path,
            "engine": _get_schematic_engine(),
        }
    except Exception as e:
        logger.error("Failed to modify component %s in %s: %s", reference, schematic_path, e)
        return {
            "success": False,
            "error": str(e),
            "reference": reference,
            "schematic_path": schematic_path,
        }


@mcp.tool()
def remove_component(schematic_path: str, reference: str) -> dict[str, Any]:
    """Remove a component from a KiCad schematic by its reference designator.

    The component and all its associated properties are deleted from the
    schematic file.  Wires connected to the component's pins are *not*
    automatically removed -- use ``remove_wire`` to clean those up if needed.

    Args:
        schematic_path: Path to an existing .kicad_sch file.
        reference: Reference designator of the component to remove (e.g. ``R1``, ``U3``).

    Returns:
        Dictionary with ``success``, removed ``reference``, and ``engine``.
    """
    verr = _validate_schematic_path(schematic_path)
    if verr:
        return verr
    schematic_path = _expand(schematic_path)

    if not reference:
        return {"success": False, "error": "reference must be a non-empty string"}

    try:
        sch = load_schematic(schematic_path)
        removed = sch.components.remove(reference)
        if removed is False:
            return {
                "success": False,
                "error": f"Component '{reference}' not found in schematic",
                "reference": reference,
                "schematic_path": schematic_path,
            }
        sch.save(schematic_path)

        logger.info("Removed component %s from %s", reference, schematic_path)
        return {
            "success": True,
            "reference": reference,
            "schematic_path": schematic_path,
            "engine": _get_schematic_engine(),
        }
    except Exception as e:
        logger.error("Failed to remove component %s from %s: %s", reference, schematic_path, e)
        return {
            "success": False,
            "error": str(e),
            "reference": reference,
            "schematic_path": schematic_path,
        }


@mcp.tool()
def remove_wire(schematic_path: str, wire_id: str) -> dict[str, Any]:
    """Remove a wire segment from a KiCad schematic by its UUID.

    Wire IDs are returned by ``add_wire`` and ``connect_pins``, or can be
    found via ``get_schematic_info``.  Removing a wire breaks the electrical
    connection it represents.

    Args:
        schematic_path: Path to an existing .kicad_sch file.
        wire_id: UUID of the wire segment to remove.

    Returns:
        Dictionary with ``success``, removed ``wire_id``, and ``engine``.
    """
    verr = _validate_schematic_path(schematic_path)
    if verr:
        return verr
    schematic_path = _expand(schematic_path)

    if not wire_id:
        return {"success": False, "error": "wire_id must be a non-empty string"}

    try:
        sch = load_schematic(schematic_path)
        sch.remove_wire(wire_id)
        sch.save(schematic_path)

        logger.info("Removed wire %s from %s", wire_id, schematic_path)
        return {
            "success": True,
            "wire_id": wire_id,
            "schematic_path": schematic_path,
            "engine": _get_schematic_engine(),
        }
    except Exception as e:
        logger.error("Failed to remove wire %s from %s: %s", wire_id, schematic_path, e)
        return {
            "success": False,
            "error": str(e),
            "wire_id": wire_id,
            "schematic_path": schematic_path,
        }


@mcp.tool()
def remove_label(schematic_path: str, label_id: str) -> dict[str, Any]:
    """Remove a net label (local or global) from a KiCad schematic by its UUID.

    Label IDs are returned by ``add_label`` or can be found via
    ``get_schematic_info``.  Removing a label may disconnect nets that
    relied on it for naming or inter-sheet connectivity.

    Args:
        schematic_path: Path to an existing .kicad_sch file.
        label_id: UUID of the label to remove.

    Returns:
        Dictionary with ``success``, removed ``label_id``, and ``engine``.
    """
    verr = _validate_schematic_path(schematic_path)
    if verr:
        return verr
    schematic_path = _expand(schematic_path)

    if not label_id:
        return {"success": False, "error": "label_id must be a non-empty string"}

    try:
        sch = load_schematic(schematic_path)
        sch.remove_label(label_id)
        sch.save(schematic_path)

        logger.info("Removed label %s from %s", label_id, schematic_path)
        return {
            "success": True,
            "label_id": label_id,
            "schematic_path": schematic_path,
            "engine": _get_schematic_engine(),
        }
    except Exception as e:
        logger.error("Failed to remove label %s from %s: %s", label_id, schematic_path, e)
        return {
            "success": False,
            "error": str(e),
            "label_id": label_id,
            "schematic_path": schematic_path,
        }


@mcp.tool()
def set_title_block(
    schematic_path: str,
    title: str | None = None,
    author: str | None = None,
    date: str | None = None,
    revision: str | None = None,
    company: str | None = None,
) -> dict[str, Any]:
    """Set or update the title block fields on a KiCad schematic.

    The title block appears in the lower-right corner of printed schematics
    and is embedded in exported PDFs.  Only the fields you provide will be
    changed; omitted fields keep their current values.

    Args:
        schematic_path: Path to an existing .kicad_sch file.
        title: Schematic title (e.g. ``Motor Driver Rev B``).
        author: Designer or team name.
        date: Design date string (e.g. ``2026-03-03``).
        revision: Revision identifier (e.g. ``1.2``, ``C``).
        company: Company or organisation name.

    Returns:
        Dictionary with ``success``, ``fields_set`` list, and ``engine``.
    """
    verr = _validate_schematic_path(schematic_path)
    if verr:
        return verr
    schematic_path = _expand(schematic_path)

    # Build kwargs for kicad-sch-api's set_title_block().
    # API signature: set_title_block(title, date, rev, company, comments)
    # There is no 'author' param — KiCad convention puts author in Comment1.
    kwargs: dict[str, Any] = {}
    fields_set: list[str] = []
    if title is not None:
        kwargs["title"] = title
        fields_set.append("title")
    if date is not None:
        kwargs["date"] = date
        fields_set.append("date")
    if revision is not None:
        kwargs["rev"] = revision
        fields_set.append("revision")
    if company is not None:
        kwargs["company"] = company
        fields_set.append("company")
    if author is not None:
        kwargs["comments"] = {1: author}
        fields_set.append("author")

    if not fields_set:
        return {
            "success": True,
            "fields_set": [],
            "note": "No fields provided -- title block left unchanged",
            "schematic_path": schematic_path,
            "engine": _get_schematic_engine(),
        }

    try:
        sch = load_schematic(schematic_path)
        sch.set_title_block(**kwargs)
        sch.save(schematic_path)

        logger.info("Set title block fields %s in %s", fields_set, schematic_path)
        return {
            "success": True,
            "fields_set": fields_set,
            "schematic_path": schematic_path,
            "engine": _get_schematic_engine(),
        }
    except Exception as e:
        logger.error("Failed to set title block in %s: %s", schematic_path, e)
        return {"success": False, "error": str(e), "schematic_path": schematic_path}


@mcp.tool()
def add_text_annotation(
    schematic_path: str,
    text: str,
    x: float,
    y: float,
) -> dict[str, Any]:
    """Add a free-text annotation to a KiCad schematic.

    Text annotations are non-electrical notes placed directly on the
    schematic sheet -- useful for design notes, revision comments, or
    pin-function callouts that don't affect the netlist.

    Args:
        schematic_path: Path to an existing .kicad_sch file.
        text: The annotation text to display.
        x: Horizontal position in schematic units.
        y: Vertical position in schematic units.

    Returns:
        Dictionary with ``success``, ``text_id``, ``position``, and ``engine``.
    """
    verr = _validate_schematic_path(schematic_path)
    if verr:
        return verr
    schematic_path = _expand(schematic_path)

    if not text:
        return {"success": False, "error": "text must be a non-empty string"}

    try:
        sch = load_schematic(schematic_path)
        text_id = sch.add_text(text, x, y)
        sch.save(schematic_path)

        logger.info("Added text annotation at (%.1f, %.1f) in %s", x, y, schematic_path)
        return {
            "success": True,
            "text_id": text_id,
            "text": text,
            "position": {"x": x, "y": y},
            "schematic_path": schematic_path,
            "engine": _get_schematic_engine(),
        }
    except Exception as e:
        logger.error("Failed to add text annotation in %s: %s", schematic_path, e)
        return {"success": False, "error": str(e), "schematic_path": schematic_path}


@mcp.tool()
def add_no_connect(
    schematic_path: str,
    x: float,
    y: float,
) -> dict[str, Any]:
    """Place a no-connect flag (X marker) on a schematic pin.

    No-connect flags tell the ERC (electrical rules checker) that an
    unconnected pin is intentional, suppressing false-positive warnings.
    Place one on every unused pin to keep ERC results clean.

    Args:
        schematic_path: Path to an existing .kicad_sch file.
        x: X position of the pin to mark as no-connect.
        y: Y position of the pin to mark as no-connect.

    Returns:
        Dictionary with ``success``, ``position``, and ``engine``.
    """
    verr = _validate_schematic_path(schematic_path)
    if verr:
        return verr
    schematic_path = _expand(schematic_path)

    try:
        sch = load_schematic(schematic_path)
        sch.add_no_connect(x, y)
        sch.save(schematic_path)

        logger.info("Added no-connect at (%.1f, %.1f) in %s", x, y, schematic_path)
        return {
            "success": True,
            "position": {"x": x, "y": y},
            "schematic_path": schematic_path,
            "engine": _get_schematic_engine(),
        }
    except Exception as e:
        logger.error("Failed to add no-connect in %s: %s", schematic_path, e)
        return {"success": False, "error": str(e), "schematic_path": schematic_path}


@mcp.tool()
def backup_schematic(schematic_path: str) -> dict[str, Any]:
    """Create a timestamped backup of a KiCad schematic file.

    Writes a copy of the schematic to a backup file alongside the original,
    named with a timestamp so that multiple backups can coexist.  Call this
    before making destructive edits (bulk component removal, major rewiring)
    to ensure you can recover the previous state.

    Args:
        schematic_path: Path to the .kicad_sch file to back up.

    Returns:
        Dictionary with ``success``, ``backup_path``, and ``engine``.
    """
    verr = _validate_schematic_path(schematic_path)
    if verr:
        return verr
    schematic_path = _expand(schematic_path)

    try:
        sch = load_schematic(schematic_path)
        backup_path = sch.backup()

        logger.info("Backed up %s to %s", schematic_path, backup_path)
        return {
            "success": True,
            "original_path": schematic_path,
            "backup_path": str(backup_path),
            "engine": _get_schematic_engine(),
        }
    except Exception as e:
        logger.error("Failed to back up %s: %s", schematic_path, e)
        return {"success": False, "error": str(e), "schematic_path": schematic_path}


@mcp.tool()
def remove_wires_by_criteria(
    schematic_path: str,
    y: float | None = None,
    x: float | None = None,
    min_x: float | None = None,
    max_x: float | None = None,
    min_y: float | None = None,
    max_y: float | None = None,
    tolerance: float = 0.01,
    dry_run: bool = False,
) -> dict[str, Any]:
    """Remove wire segments matching coordinate criteria from a KiCad schematic.

    Uses direct s-expression manipulation to surgically remove wires
    by their position — essential for cleaning up bulk wiring errors
    like overlapping horizontal/vertical segments that create shorts.

    All specified criteria must match for a wire to be selected.
    At least one criterion is required (won't delete all wires).

    Args:
        schematic_path: Path to an existing .kicad_sch file.
        y: Match horizontal wires where both endpoints have Y within
            ``tolerance`` of this value.
        x: Match vertical wires where both endpoints have X within
            ``tolerance`` of this value.
        min_x: Both endpoints' X values must be >= this value (minus tolerance).
        max_x: Both endpoints' X values must be <= this value (plus tolerance).
        min_y: Both endpoints' Y values must be >= this value (minus tolerance).
        max_y: Both endpoints' Y values must be <= this value (plus tolerance).
        tolerance: Coordinate comparison tolerance (default 0.01).
        dry_run: If True, return matching wires without removing them.

    Returns:
        Dictionary with ``matched_count``, ``removed_count`` (0 if dry_run),
        and ``matched_wires`` preview list.
    """
    verr = _validate_schematic_path(schematic_path)
    if verr:
        return verr

    schematic_path = _expand(schematic_path)

    # Require at least one filtering criterion
    has_criteria = any(v is not None for v in (y, x, min_x, max_x, min_y, max_y))
    if not has_criteria:
        return {
            "success": False,
            "error": "At least one coordinate criterion (y, x, min_x, max_x, min_y, max_y) is required",
        }

    try:
        all_wires = parse_wire_segments(schematic_path)

        if not all_wires:
            return {
                "success": True,
                "matched_count": 0,
                "removed_count": 0,
                "note": "No wire segments found in schematic",
                "schematic_path": schematic_path,
            }

        # Filter wires by criteria
        matched: list[dict[str, Any]] = []
        for wire in all_wires:
            sx, sy = wire["start"]["x"], wire["start"]["y"]
            ex, ey = wire["end"]["x"], wire["end"]["y"]

            if y is not None and (abs(sy - y) > tolerance or abs(ey - y) > tolerance):
                continue

            if x is not None and (abs(sx - x) > tolerance or abs(ex - x) > tolerance):
                continue

            if min_x is not None and min(sx, ex) < min_x - tolerance:
                continue

            if max_x is not None and max(sx, ex) > max_x + tolerance:
                continue

            if min_y is not None and min(sy, ey) < min_y - tolerance:
                continue

            if max_y is not None and max(sy, ey) > max_y + tolerance:
                continue

            matched.append(wire)

        if dry_run or not matched:
            return {
                "success": True,
                "dry_run": dry_run,
                "matched_count": len(matched),
                "removed_count": 0,
                "matched_wires": matched[:50],  # cap preview
                "schematic_path": schematic_path,
            }

        # Remove matched wires via s-expression manipulation
        uuids_to_remove = {w["uuid"] for w in matched if w.get("uuid")}
        if not uuids_to_remove:
            return {
                "success": False,
                "error": "Matched wires have no UUIDs — cannot remove (file may be malformed)",
                "matched_count": len(matched),
                "schematic_path": schematic_path,
            }

        removed_count = remove_sexp_blocks_by_uuid(schematic_path, uuids_to_remove)

        logger.info(
            "remove_wires_by_criteria: removed %d/%d matched wires from %s",
            removed_count, len(matched), schematic_path,
        )

        return {
            "success": True,
            "dry_run": False,
            "matched_count": len(matched),
            "removed_count": removed_count,
            "matched_wires": matched[:50],
            "schematic_path": schematic_path,
        }

    except Exception as e:
        logger.error("remove_wires_by_criteria failed: %s", e, exc_info=True)
        return {"success": False, "error": str(e), "schematic_path": schematic_path}