"""Search tools: grep_files and find_files."""

import subprocess
from typing import Any

from pydantic import BaseModel, Field

from app.models.tool_call import ToolResult, ToolResultStatus
from app.tools.base import BaseTool
from app.utils.file_helpers import PathSecurityError, resolve_safe_path

_GREP_MAX_MATCHES = 100
_FIND_MAX_RESULTS = 200


class GrepFilesParams(BaseModel):
    """Parameters for the grep_files tool."""

    pattern: str = Field(description="Regular expression pattern to search for")
    path: str = Field(default=".", description="Directory or file to search in (relative to workspace root)")
    file_pattern: str | None = Field(
        default=None, description="Glob pattern to filter files (e.g. '*.py')"
    )


class GrepFilesTool(BaseTool):
    """Search file contents using grep."""

    name = "grep_files"
    description = (
        "Search for a regex pattern in file contents. Returns matching lines with "
        "file paths and line numbers."
    )
    params_model = GrepFilesParams

    def execute(
        self,
        *,
        tool_call_id: str,
        pattern: str,
        path: str = ".",
        file_pattern: str | None = None,
        **kwargs: Any,
    ) -> ToolResult:
        try:
            safe_path = resolve_safe_path(path, self.workspace_root)
        except PathSecurityError as exc:
            return ToolResult(
                tool_call_id=tool_call_id,
                tool_name=self.name,
                status=ToolResultStatus.ERROR,
                error=str(exc),
            )

        cmd = ["grep", "-rn", pattern, str(safe_path)]
        if file_pattern:
            cmd.insert(3, f"--include={file_pattern}")

        try:
            result = subprocess.run(
                cmd,
                capture_output=True,
                text=True,
                timeout=30,
            )
        except subprocess.TimeoutExpired:
            return ToolResult(
                tool_call_id=tool_call_id,
                tool_name=self.name,
                status=ToolResultStatus.ERROR,
                error="grep timed out after 30 seconds",
            )

        if result.returncode == 1:
            # No matches — not an error
            return ToolResult(
                tool_call_id=tool_call_id,
                tool_name=self.name,
                status=ToolResultStatus.SUCCESS,
                output="No matches found.",
            )

        if result.returncode >= 2:
            return ToolResult(
                tool_call_id=tool_call_id,
                tool_name=self.name,
                status=ToolResultStatus.ERROR,
                error=result.stderr.strip() or f"grep exited with code {result.returncode}",
            )

        # Truncate to max matches
        lines = result.stdout.splitlines()
        output_lines = lines[:_GREP_MAX_MATCHES]
        if len(lines) > _GREP_MAX_MATCHES:
            output_lines.append(f"\n... truncated ({len(lines)} matches, showing {_GREP_MAX_MATCHES})")

        return ToolResult(
            tool_call_id=tool_call_id,
            tool_name=self.name,
            status=ToolResultStatus.SUCCESS,
            output="\n".join(output_lines),
        )


class FindFilesParams(BaseModel):
    """Parameters for the find_files tool."""

    pattern: str = Field(description="File name pattern to search for (e.g. '*.py', 'config.yaml')")
    path: str = Field(default=".", description="Directory to search in (relative to workspace root)")


class FindFilesTool(BaseTool):
    """Find files by name pattern."""

    name = "find_files"
    description = "Search for files matching a name pattern. Returns relative file paths."
    params_model = FindFilesParams

    def execute(
        self,
        *,
        tool_call_id: str,
        pattern: str,
        path: str = ".",
        **kwargs: Any,
    ) -> ToolResult:
        try:
            safe_path = resolve_safe_path(path, self.workspace_root)
        except PathSecurityError as exc:
            return ToolResult(
                tool_call_id=tool_call_id,
                tool_name=self.name,
                status=ToolResultStatus.ERROR,
                error=str(exc),
            )

        cmd = ["find", str(safe_path), "-name", pattern, "-type", "f"]

        try:
            result = subprocess.run(
                cmd,
                capture_output=True,
                text=True,
                timeout=30,
            )
        except subprocess.TimeoutExpired:
            return ToolResult(
                tool_call_id=tool_call_id,
                tool_name=self.name,
                status=ToolResultStatus.ERROR,
                error="find timed out after 30 seconds",
            )

        if result.returncode != 0:
            return ToolResult(
                tool_call_id=tool_call_id,
                tool_name=self.name,
                status=ToolResultStatus.ERROR,
                error=result.stderr.strip() or f"find exited with code {result.returncode}",
            )

        # Make paths relative to workspace root and truncate
        lines = result.stdout.strip().splitlines() if result.stdout.strip() else []
        relative_lines: list[str] = []
        for line in lines[:_FIND_MAX_RESULTS]:
            try:
                from pathlib import Path

                rel = Path(line).relative_to(self.workspace_root)
                relative_lines.append(str(rel))
            except ValueError:
                relative_lines.append(line)

        if len(lines) > _FIND_MAX_RESULTS:
            relative_lines.append(f"\n... truncated ({len(lines)} results, showing {_FIND_MAX_RESULTS})")

        output = "\n".join(relative_lines) if relative_lines else "No files found."

        return ToolResult(
            tool_call_id=tool_call_id,
            tool_name=self.name,
            status=ToolResultStatus.SUCCESS,
            output=output,
        )