"""CLI: obsidian-rag index | sync | reindex | status."""

from __future__ import annotations

import json
import sys
import time
from pathlib import Path

import obsidian_rag.config as config_mod
from obsidian_rag.vector_store import get_db, get_stats
from obsidian_rag.indexer import Indexer


def main(argv: list[str] | None = None) -> int:
    argv = argv or sys.argv[1:]

    if not argv or argv[0] in ("--help", "-h"):
        print(_usage())
        return 0

    cmd = argv[0]

    try:
        config = config_mod.load_config()
    except FileNotFoundError as e:
        print(f"ERROR: {e}", file=sys.stderr)
        return 1

    if cmd == "index":
        return _index(config)
    elif cmd == "sync":
        return _sync(config)
    elif cmd == "reindex":
        return _reindex(config)
    elif cmd == "status":
        return _status(config)
    else:
        print(f"Unknown command: {cmd}\n{_usage()}", file=sys.stderr)
        return 1


def _index(config) -> int:
    indexer = Indexer(config)
    t0 = time.monotonic()

    try:
        gen = indexer.full_index()
        result: dict = {"indexed_files": 0, "total_chunks": 0, "errors": []}
        for item in gen:
            result = item  # progress yields are dicts; final dict from return
        duration_ms = int((time.monotonic() - t0) * 1000)
        print(
            json.dumps(
                {
                    "type": "complete",
                    "indexed_files": result["indexed_files"],
                    "total_chunks": result["total_chunks"],
                    "duration_ms": duration_ms,
                    "errors": result["errors"],
                },
                indent=2,
            )
        )
        return 0 if not result["errors"] else 1
    except Exception as e:
        print(json.dumps({"type": "error", "error": str(e)}), file=sys.stderr)
        return 2


def _sync(config) -> int:
    indexer = Indexer(config)
    try:
        result = indexer.sync()
        print(json.dumps({"type": "complete", **result}, indent=2))
        return 0 if not result["errors"] else 1
    except Exception as e:
        print(json.dumps({"type": "error", "error": str(e)}), file=sys.stderr)
        return 2


def _reindex(config) -> int:
    indexer = Indexer(config)
    t0 = time.monotonic()
    try:
        result = indexer.reindex()
        duration_ms = int((time.monotonic() - t0) * 1000)
        print(
            json.dumps(
                {
                    "type": "complete",
                    "indexed_files": result["indexed_files"],
                    "total_chunks": result["total_chunks"],
                    "duration_ms": duration_ms,
                    "errors": result["errors"],
                },
                indent=2,
            )
        )
        return 0
    except Exception as e:
        print(json.dumps({"type": "error", "error": str(e)}), file=sys.stderr)
        return 2


def _status(config) -> int:
    try:
        db = get_db(config)
        table = db.open_table("obsidian_chunks")
        stats = get_stats(table)
        # Resolve sync-result.json path (same convention as indexer)
        from pathlib import Path
        import os as osmod
        project_root = Path(__file__).parent.parent.parent
        data_dir = project_root / "obsidian-rag"
        if not data_dir.exists() and not (project_root / "KnowledgeVault").exists():
            data_dir = Path(osmod.path.expanduser("~/.obsidian-rag"))
        sync_path = data_dir / "sync-result.json"
        last_sync = None
        if sync_path.exists():
            try:
                last_sync = json.loads(sync_path.read_text()).get("timestamp")
            except Exception:
                pass
        print(
            json.dumps(
                {
                    "total_docs": stats["total_docs"],
                    "total_chunks": stats["total_chunks"],
                    "last_sync": last_sync,
                },
                indent=2,
            )
        )
        return 0
    except FileNotFoundError:
        print(json.dumps({"error": "Index not found. Run 'obsidian-rag index' first."}, indent=2))
        return 1
    except Exception as e:
        print(json.dumps({"error": str(e)}), file=sys.stderr)
        return 1


def _usage() -> str:
    return """obsidian-rag - Obsidian vault RAG indexer

Usage:
  obsidian-rag index    Full index of the vault
  obsidian-rag sync     Incremental sync (changed files only)
  obsidian-rag reindex  Force full reindex (nuke + rebuild)
  obsidian-rag status   Show index health and statistics
"""


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