#!/usr/bin/env python3
"""Search only source files relevant to the active incremental batch.

The command intentionally avoids recursive searches from the repository root.
By default it resolves source paths from ``module-batch-manifest.json`` and
searches those files (or a single cited directory) with ripgrep.
"""
from __future__ import annotations

import argparse
import json
import os
import shutil
import subprocess
import sys
from pathlib import Path


ROOT = Path(__file__).resolve().parents[1]
BATCH = Path(os.environ.get("FREECAD_SOURCE_BATCH", str(ROOT / "docs/current/module-batch-manifest.json")))
RUNTIME_DIRS = (
    ROOT / "freecad-source/src/WebAssembly/FreeCADCoreProbe",
    ROOT / "web/src",
)


def ripgrep() -> str:
    # The scheduler's rg wrapper rejects directories. This helper already
    # validates workspace scope and bounds output, so use the real executable.
    real = os.environ.get("FREECAD_REAL_RG")
    if real and Path(real).is_file():
        return real
    wrapper = (ROOT / "tools/scheduler-bin").resolve()
    search_path = os.pathsep.join(
        entry for entry in os.get_exec_path() if Path(entry).resolve() != wrapper
    )
    executable = shutil.which("rg", path=search_path)
    if not executable:
        raise SystemExit("FAST_SOURCE_SEARCH: ripgrep executable unavailable")
    return executable


def batch_paths() -> list[Path]:
    try:
        payload = json.loads(BATCH.read_text(encoding="utf-8"))
    except (OSError, json.JSONDecodeError):
        return []
    if not isinstance(payload, dict):
        return []
    paths: set[Path] = set()
    sources = [str(row[3]) for row in payload.get("records", []) if isinstance(row, list) and len(row) >= 4 and row[3]]
    sources.extend(source for source in payload.get("sourcePaths", []) if isinstance(source, str))
    for source in sources:
        source = source.replace("\\", "/")
        for base in (ROOT, ROOT / "freecad-source"):
            candidate = (base / source).resolve()
            try:
                candidate.relative_to(ROOT.resolve())
            except ValueError:
                continue
            if candidate.is_file():
                paths.add(candidate)
                break
            if candidate.is_dir():
                paths.update(list_source_files(candidate))
                break
    return sorted(paths)


def list_source_files(directory: Path, limit: int = 5000) -> list[Path]:
    try:
        result = subprocess.run(
            [ripgrep(), "--files", "--sort", "path", str(directory)],
            cwd=ROOT,
            text=True,
            capture_output=True,
            check=False,
        )
    except OSError as error:
        raise SystemExit(f"FAST_SOURCE_SEARCH: file enumeration failed: {error}")
    if result.returncode not in (0, 1):
        raise SystemExit(f"FAST_SOURCE_SEARCH: file enumeration failed: {result.stderr.strip()}")
    files = []
    for line in result.stdout.splitlines():
        path = (ROOT / line).resolve()
        if not path.is_relative_to(ROOT.resolve()):
            continue
        if path.is_file() and path.suffix in {".cpp", ".cxx", ".h", ".hpp", ".py", ".cmake", ".ts", ".tsx", ".mjs"}:
            files.append(path)
        if len(files) > limit:
            raise SystemExit(f"FAST_SOURCE_SEARCH: more than {limit} source files in {directory}; cite a narrower --path")
    return files


def resolve_explicit(value: str) -> list[Path]:
    candidate = (ROOT / value).resolve() if not Path(value).is_absolute() else Path(value).resolve()
    try:
        candidate.relative_to(ROOT.resolve())
    except ValueError:
        raise SystemExit(f"path outside workspace: {value}")
    if candidate.is_file():
        return [candidate]
    if candidate.is_dir():
        return list_source_files(candidate)
    return []


def main() -> int:
    marker = os.environ.get("FREECAD_SOURCE_BUDGET_MARKER", "")
    if marker and Path(marker).is_file():
        print(
            "SCHEDULER_SOURCE_BUDGET_REACHED: search was not executed. Reuse excerpts or use "
            "python3 tools/read_implementation_source.py FILE --start LINE --lines 60 --reason 'missing anchor' "
            "for an exact current-packet file.",
            file=sys.stderr,
        )
        return 64
    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument("pattern", nargs="?", help="ripgrep pattern or literal symbol")
    parser.add_argument("--pattern", dest="pattern_option", help="named form of the search pattern")
    parser.add_argument("extra_paths", nargs="*", help="optional explicit workspace-relative paths (compatibility form; --path is preferred)")
    parser.add_argument("--path", action="append", default=[], help="explicit workspace-relative file or directory; repeatable")
    parser.add_argument("--paths", nargs="+", default=[], help="compatibility alias accepting one or more explicit paths")
    parser.add_argument("--glob", action="append", default=[], help="forward a ripgrep glob while retaining workspace scoping")
    parser.add_argument("-n", action="store_true", help=argparse.SUPPRESS)
    parser.add_argument("--runtime", action="store_true", help="also search the small runtime adapter directories")
    parser.add_argument("--fixed-strings", action="store_true", help="treat pattern as a literal string")
    parser.add_argument("--context", type=int, default=2, help="lines of context around each match")
    parser.add_argument("--max-count", "--max-results", dest="max_count", type=int, default=80, help="global maximum matching lines")
    parse = parser.parse_intermixed_args if hasattr(parser, "parse_intermixed_args") else parser.parse_args
    args = parse()
    if args.pattern_option is not None:
        if args.pattern is not None:
            args.extra_paths.insert(0, args.pattern)
        args.pattern = args.pattern_option
    if args.pattern is None:
        parser.error("a positional pattern or --pattern is required")

    explicit_paths = [*args.path, *args.paths, *args.extra_paths]
    # Explicit scope must not be crowded out by unrelated batch matches.
    paths: set[Path] = set() if explicit_paths else set(batch_paths())
    for value in explicit_paths:
        paths.update(resolve_explicit(value))
    if args.runtime:
        for directory in RUNTIME_DIRS:
            paths.update(list_source_files(directory))
    paths = {path for path in paths if path.is_file()}
    if not paths:
        print("FAST_SOURCE_SEARCH: no scoped source files; cite --path or prepare a batch manifest", file=sys.stderr)
        return 2

    command = [ripgrep(), "-n", "-H", "-S", "--no-heading", "--color", "never", "--max-count", str(max(1, args.max_count))]
    if args.fixed_strings:
        command.append("--fixed-strings")
    if args.context > 0:
        command.extend(["-C", str(min(args.context, 12))])
    for pattern in args.glob:
        command.extend(["--glob", pattern])
    command.extend([args.pattern, "--", *map(str, sorted(paths))])
    result = subprocess.run(command, cwd=ROOT, text=True, capture_output=True, check=False)
    if result.returncode == 1:
        # ripgrep uses 1 for a valid search with no matches. Treat that as a
        # successful exploratory step so an `rg ... && edit` chain does not
        # become a scheduler failure merely because the symbol is absent.
        print(f"FAST_SOURCE_SEARCH: files={len(paths)} pattern={args.pattern!r} matches=0", file=sys.stderr)
        return 0
    output_lines = result.stdout.splitlines()
    global_limit = max(1, args.max_count)
    for line in output_lines[:global_limit]:
        print(line)
    if result.stderr:
        print(result.stderr, end="", file=sys.stderr)
    truncated = max(0, len(output_lines) - global_limit)
    print(f"FAST_SOURCE_SEARCH: files={len(paths)} pattern={args.pattern!r} lines={min(len(output_lines), global_limit)} truncated={truncated}", file=sys.stderr)
    return result.returncode


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