"""Deterministic JSON command-line interface for DocForge project inspection."""

from __future__ import annotations

import argparse
import json
import sys
from pathlib import Path

from .context import compile_context
from .errors import DocForgeError
from .index import ProjectIndex
from .project import Project, project_root_fingerprint


def _parser() -> argparse.ArgumentParser:
    parser = argparse.ArgumentParser(prog="docforge")
    parser.add_argument("--project-root", type=Path, required=True)
    commands = parser.add_subparsers(dest="command", required=True)
    commands.add_parser("info")
    commands.add_parser("validate")
    commands.add_parser("build")
    commands.add_parser("check")
    commands.add_parser("validate-index")
    show = commands.add_parser("show")
    show.add_argument("node_id")
    search = commands.add_parser("search")
    search.add_argument("query")
    search.add_argument("--limit", type=int)
    filter_command = commands.add_parser("filter")
    filter_command.add_argument("--family")
    filter_command.add_argument("--authority")
    filter_command.add_argument("--status")
    filter_command.add_argument("--tag")
    filter_command.add_argument("--limit", type=int)
    for name in ("backlinks", "dependencies", "impact"):
        command = commands.add_parser(name)
        command.add_argument("node_id")
        if name == "backlinks":
            command.add_argument("--relation")
        else:
            command.add_argument("--depth", type=int, default=2)
    context = commands.add_parser("context")
    context.add_argument("profile")
    context.add_argument("--budget", type=int)
    return parser


def _run(arguments: argparse.Namespace) -> dict[str, object]:
    project = Project.open(arguments.project_root)
    index = ProjectIndex(project)
    if arguments.command == "info":
        snapshot = project.load()
        return {
            "status": "ok",
            "project_id": snapshot.descriptor.project_id,
            "project_root_fingerprint": project_root_fingerprint(snapshot.descriptor.root),
            "title": snapshot.descriptor.title,
            "adapter": snapshot.descriptor.adapter,
            "revision": snapshot.revision,
            "source_hash": snapshot.source_hash,
            "node_count": len(snapshot.nodes),
            "edge_count": len(snapshot.edges),
            "index": str(snapshot.descriptor.index_path),
        }
    if arguments.command == "validate":
        snapshot = project.load()
        return {
            "status": "ok",
            "project_id": snapshot.descriptor.project_id,
            "project_root_fingerprint": project_root_fingerprint(snapshot.descriptor.root),
            "revision": snapshot.revision,
            "source_hash": snapshot.source_hash,
            "node_count": len(snapshot.nodes),
            "edge_count": len(snapshot.edges),
        }
    if arguments.command == "build":
        return index.build()
    if arguments.command == "check":
        return index.check()
    if arguments.command == "validate-index":
        return index.check()
    if arguments.command == "show":
        return index.get_node(arguments.node_id)
    if arguments.command == "search":
        return index.search(arguments.query, limit=arguments.limit)
    if arguments.command == "filter":
        return index.filter_nodes(
            family=arguments.family,
            authority=arguments.authority,
            status=arguments.status,
            tag=arguments.tag,
            limit=arguments.limit,
        )
    if arguments.command == "backlinks":
        return index.backlinks(arguments.node_id, relation=arguments.relation)
    if arguments.command == "dependencies":
        return index.dependencies(arguments.node_id, depth=arguments.depth)
    if arguments.command == "impact":
        return index.impact(arguments.node_id, depth=arguments.depth)
    if arguments.command == "context":
        return compile_context(index, arguments.profile, arguments.budget)
    raise DocForgeError("invalid_command", "Unknown command")


def main(argv: list[str] | None = None) -> int:
    parser = _parser()
    arguments = parser.parse_args(argv)
    try:
        result = _run(arguments)
        code = 0
    except DocForgeError as error:
        result = {"status": "error", "error": error.as_dict()}
        code = 2
    print(json.dumps(result, sort_keys=True, indent=2))
    return code


if __name__ == "__main__":
    sys.exit(main())