"""
File export tools for KiCad MCP server.

Provides tools for generating SVG renders, Gerber files, drill files,
and PDFs from KiCad PCB and schematic files using kicad-cli.
"""

import contextlib
import logging
import os
from typing import Any

from mckicad.server import mcp
from mckicad.utils.file_utils import get_project_files
from mckicad.utils.secure_subprocess import run_kicad_command

logger = logging.getLogger(__name__)


# ---------------------------------------------------------------------------
# Internal helpers
# ---------------------------------------------------------------------------


def _resolve_pcb(project_path: str) -> tuple[str | None, str | None]:
    """Return (pcb_file, error_message).  One will always be None."""
    if not os.path.exists(project_path):
        return None, f"Project not found: {project_path}"
    files = get_project_files(project_path)
    pcb = files.get("pcb")
    if not pcb:
        return None, "PCB file not found in project"
    return pcb, None


def _resolve_file(project_path: str, file_type: str) -> tuple[str | None, str | None]:
    """Return (resolved_file, error_message) for pcb or schematic."""
    if not os.path.exists(project_path):
        return None, f"Project not found: {project_path}"
    files = get_project_files(project_path)
    target = files.get(file_type)
    if not target:
        return None, f"{file_type.capitalize()} file not found in project"
    return target, None


# ---------------------------------------------------------------------------
# MCP Tool definitions
# ---------------------------------------------------------------------------


@mcp.tool()
def generate_pcb_svg(project_path: str) -> dict[str, Any]:
    """Generate an SVG render of a KiCad PCB layout.

    Uses ``kicad-cli pcb export svg`` to produce a multi-layer SVG of
    the board.  The SVG content is returned as a string so the caller
    can display or save it.

    Args:
        project_path: Absolute path to the .kicad_pro file.

    Returns:
        Dictionary with the SVG content, output path, and file size.
    """
    logger.info("Generating PCB SVG for project: %s", project_path)

    pcb_file, err = _resolve_pcb(project_path)
    if err or not pcb_file:
        logger.warning(err)
        return {"success": False, "data": None, "error": err}

    project_dir = os.path.dirname(project_path)
    basename = os.path.basename(pcb_file)
    stem = os.path.splitext(basename)[0]
    output_file = os.path.join(project_dir, f"{stem}.svg")

    try:
        result = run_kicad_command(
            command_args=[
                "pcb", "export", "svg",
                "--output", output_file,
                "--layers",
                "F.Cu,B.Cu,F.SilkS,B.SilkS,F.Mask,B.Mask,Edge.Cuts",
                pcb_file,
            ],
            input_files=[pcb_file],
            output_files=[output_file],
        )

        if result.returncode != 0:
            error_msg = result.stderr.strip() if result.stderr else "SVG export failed"
            logger.error("SVG export failed (rc=%d): %s", result.returncode, error_msg)
            return {"success": False, "data": None, "error": error_msg}

        if not os.path.exists(output_file):
            logger.error("SVG output file not created: %s", output_file)
            return {"success": False, "data": None, "error": "SVG output file was not created"}

        with open(output_file, encoding="utf-8") as f:
            svg_content = f.read()

        file_size = os.path.getsize(output_file)
        logger.info("SVG generated: %s (%d bytes)", output_file, file_size)

        return {
            "success": True,
            "data": {
                "output_file": output_file,
                "file_size": file_size,
                "svg_content": svg_content,
            },
            "error": None,
        }

    except Exception as e:
        logger.error("SVG generation failed: %s", e, exc_info=True)
        return {"success": False, "data": None, "error": str(e)}


@mcp.tool()
def export_gerbers(project_path: str) -> dict[str, Any]:
    """Export Gerber manufacturing files from a KiCad PCB.

    Runs ``kicad-cli pcb export gerbers`` and writes the output into a
    ``gerbers/`` subdirectory alongside the project.  Returns the list
    of generated files.

    Args:
        project_path: Absolute path to the .kicad_pro file.

    Returns:
        Dictionary with output directory path and list of generated files.
    """
    logger.info("Exporting Gerbers for project: %s", project_path)

    pcb_file, err = _resolve_pcb(project_path)
    if err or not pcb_file:
        logger.warning(err)
        return {"success": False, "data": None, "error": err}

    project_dir = os.path.dirname(project_path)
    output_dir = os.path.join(project_dir, "gerbers")
    os.makedirs(output_dir, exist_ok=True)

    try:
        result = run_kicad_command(
            command_args=[
                "pcb", "export", "gerbers",
                "--output", output_dir + os.sep,
                pcb_file,
            ],
            input_files=[pcb_file],
        )

        if result.returncode != 0:
            error_msg = result.stderr.strip() if result.stderr else "Gerber export failed"
            logger.error("Gerber export failed (rc=%d): %s", result.returncode, error_msg)
            return {"success": False, "data": None, "error": error_msg}

        generated_files = []
        try:
            for entry in os.listdir(output_dir):
                full = os.path.join(output_dir, entry)
                if os.path.isfile(full):
                    generated_files.append(entry)
        except OSError as exc:
            logger.warning("Could not list Gerber output directory: %s", exc)

        if not generated_files:
            logger.warning("No Gerber files were generated")
            return {"success": False, "data": None, "error": "No Gerber files were generated"}

        logger.info("Exported %d Gerber file(s) to %s", len(generated_files), output_dir)

        return {
            "success": True,
            "data": {
                "output_dir": output_dir,
                "files": sorted(generated_files),
                "file_count": len(generated_files),
            },
            "error": None,
        }

    except Exception as e:
        logger.error("Gerber export failed: %s", e, exc_info=True)
        return {"success": False, "data": None, "error": str(e)}


@mcp.tool()
def export_drill(project_path: str) -> dict[str, Any]:
    """Export drill files from a KiCad PCB.

    Runs ``kicad-cli pcb export drill`` and writes output to a
    ``gerbers/`` subdirectory (common convention to co-locate with
    Gerber files).

    Args:
        project_path: Absolute path to the .kicad_pro file.

    Returns:
        Dictionary with output directory path and list of generated files.
    """
    logger.info("Exporting drill files for project: %s", project_path)

    pcb_file, err = _resolve_pcb(project_path)
    if err or not pcb_file:
        logger.warning(err)
        return {"success": False, "data": None, "error": err}

    project_dir = os.path.dirname(project_path)
    output_dir = os.path.join(project_dir, "gerbers")
    os.makedirs(output_dir, exist_ok=True)

    try:
        result = run_kicad_command(
            command_args=[
                "pcb", "export", "drill",
                "--output", output_dir + os.sep,
                pcb_file,
            ],
            input_files=[pcb_file],
        )

        if result.returncode != 0:
            error_msg = result.stderr.strip() if result.stderr else "Drill export failed"
            logger.error("Drill export failed (rc=%d): %s", result.returncode, error_msg)
            return {"success": False, "data": None, "error": error_msg}

        # Collect drill-related files (.drl, .exc, .xln)
        drill_extensions = {".drl", ".exc", ".xln"}
        generated_files = []
        try:
            for entry in os.listdir(output_dir):
                full = os.path.join(output_dir, entry)
                _, ext = os.path.splitext(entry)
                if os.path.isfile(full) and ext.lower() in drill_extensions:
                    generated_files.append(entry)
        except OSError as exc:
            logger.warning("Could not list drill output directory: %s", exc)

        if not generated_files:
            # Maybe kicad-cli used a different extension -- list everything new
            with contextlib.suppress(OSError):
                generated_files = [
                    e for e in os.listdir(output_dir) if os.path.isfile(os.path.join(output_dir, e))
                ]

        logger.info("Exported %d drill file(s) to %s", len(generated_files), output_dir)

        return {
            "success": True,
            "data": {
                "output_dir": output_dir,
                "files": sorted(generated_files),
                "file_count": len(generated_files),
            },
            "error": None,
        }

    except Exception as e:
        logger.error("Drill export failed: %s", e, exc_info=True)
        return {"success": False, "data": None, "error": str(e)}


@mcp.tool()
def export_pdf(project_path: str, file_type: str = "pcb") -> dict[str, Any]:
    """Export a PDF from a KiCad PCB or schematic.

    Runs ``kicad-cli pcb export pdf`` or ``kicad-cli sch export pdf``
    depending on *file_type*.

    Args:
        project_path: Absolute path to the .kicad_pro file.
        file_type: Either "pcb" or "schematic".

    Returns:
        Dictionary with the output PDF path and file size.
    """
    logger.info("Exporting PDF (%s) for project: %s", file_type, project_path)

    ft = file_type.lower().strip()
    if ft not in ("pcb", "schematic"):
        return {
            "success": False,
            "data": None,
            "error": f"Invalid file_type: {file_type}. Must be 'pcb' or 'schematic'.",
        }

    source_file, err = _resolve_file(project_path, ft)
    if err or not source_file:
        logger.warning(err)
        return {"success": False, "data": None, "error": err}

    project_dir = os.path.dirname(project_path)
    stem = os.path.splitext(os.path.basename(source_file))[0]
    output_file = os.path.join(project_dir, f"{stem}.pdf")

    try:
        if ft == "pcb":
            cmd_args = [
                "pcb", "export", "pdf",
                "--output", output_file,
                source_file,
            ]
        else:
            cmd_args = [
                "sch", "export", "pdf",
                "--output", output_file,
                source_file,
            ]

        result = run_kicad_command(
            command_args=cmd_args,
            input_files=[source_file],
            output_files=[output_file],
        )

        if result.returncode != 0:
            error_msg = result.stderr.strip() if result.stderr else "PDF export failed"
            logger.error("PDF export failed (rc=%d): %s", result.returncode, error_msg)
            return {"success": False, "data": None, "error": error_msg}

        if not os.path.exists(output_file):
            logger.error("PDF output file not created: %s", output_file)
            return {"success": False, "data": None, "error": "PDF output file was not created"}

        file_size = os.path.getsize(output_file)
        logger.info("PDF exported: %s (%d bytes)", output_file, file_size)

        return {
            "success": True,
            "data": {
                "output_file": output_file,
                "source_file": source_file,
                "file_type": ft,
                "file_size": file_size,
            },
            "error": None,
        }

    except Exception as e:
        logger.error("PDF export failed: %s", e, exc_info=True)
        return {"success": False, "data": None, "error": str(e)}