"""Collections commands for CmdForge CLI."""

import json
import sys

from ..resolver import install_from_registry


def cmd_collections(args):
    """Handle collections subcommands."""
    if args.collections_cmd == "list":
        return _cmd_collections_list(args)
    elif args.collections_cmd == "info":
        return _cmd_collections_info(args)
    elif args.collections_cmd == "install":
        return _cmd_collections_install(args)
    else:
        # Default: show help
        print("Collections commands:")
        print("  list               List available collections")
        print("  info <name>        Show collection details")
        print("  install <name>     Install all tools in a collection")
        return 0


def _cmd_collections_list(args):
    """List available collections."""
    from ..registry_client import RegistryError, get_client

    try:
        client = get_client()
        collections = client.get_collections()

        # JSON output
        if getattr(args, 'json', False):
            print(json.dumps({"collections": collections}, indent=2))
            return 0

        if not collections:
            print("No collections available.")
            return 0

        print(f"Available collections ({len(collections)}):\n")
        for coll in collections:
            name = coll.get("name", "")
            display_name = coll.get("display_name", name)
            description = coll.get("description", "")
            tools = coll.get("tools", [])
            tool_count = len(tools) if isinstance(tools, list) else 0

            print(f"  {name}")
            print(f"    {display_name}")
            if description:
                desc_short = description[:60] + ('...' if len(description) > 60 else '')
                print(f"    {desc_short}")
            print(f"    Tools: {tool_count}")
            print()

        print("Install a collection with: cmdforge collections install <name>")

    except RegistryError as e:
        if e.code == "CONNECTION_ERROR":
            print("Could not connect to the registry.", file=sys.stderr)
        else:
            print(f"Error: {e.message}", file=sys.stderr)
        return 1
    except Exception as e:
        print(f"Error: {e}", file=sys.stderr)
        return 1

    return 0


def _cmd_collections_info(args):
    """Show collection details."""
    from ..registry_client import RegistryError, get_client

    name = args.name

    try:
        client = get_client()
        coll = client.get_collection(name)

        # JSON output
        if getattr(args, 'json', False):
            print(json.dumps(coll, indent=2))
            return 0

        display_name = coll.get("display_name", name)
        description = coll.get("description", "")
        maintainer = coll.get("maintainer", "")
        tools = coll.get("tools", [])
        pinned = coll.get("pinned", {})
        tags = coll.get("tags", [])

        print(f"{display_name}")
        print("=" * 50)
        if description:
            print(f"\n{description}\n")
        if maintainer:
            print(f"Maintainer: {maintainer}")
        if tags:
            print(f"Tags: {', '.join(tags)}")

        print(f"\nTools ({len(tools)}):")
        for tool_ref in tools:
            version_constraint = pinned.get(tool_ref, "")
            if version_constraint:
                print(f"  - {tool_ref} @ {version_constraint}")
            else:
                print(f"  - {tool_ref}")

        print(f"\nInstall all: cmdforge collections install {name}")

    except RegistryError as e:
        if e.code == "COLLECTION_NOT_FOUND":
            print(f"Collection '{name}' not found.", file=sys.stderr)
            print("List available collections: cmdforge collections list", file=sys.stderr)
        elif e.code == "CONNECTION_ERROR":
            print("Could not connect to the registry.", file=sys.stderr)
        else:
            print(f"Error: {e.message}", file=sys.stderr)
        return 1
    except Exception as e:
        print(f"Error: {e}", file=sys.stderr)
        return 1

    return 0


def _cmd_collections_install(args):
    """Install all tools in a collection."""
    from ..registry_client import RegistryError, get_client

    name = args.name
    use_pinned = getattr(args, 'pinned', False)

    try:
        client = get_client()
        coll = client.get_collection(name)

        tools = coll.get("tools", [])
        pinned = coll.get("pinned", {}) if use_pinned else {}
        display_name = coll.get("display_name", name)

        if not tools:
            print(f"Collection '{name}' has no tools.")
            return 0

        print(f"Installing collection: {display_name}")
        print(f"Tools to install: {len(tools)}")
        if use_pinned and pinned:
            print(f"Using pinned versions: {len(pinned)} tools")
        print()

        installed = 0
        failed = 0

        for tool_ref in tools:
            version = pinned.get(tool_ref)
            try:
                print(f"  Installing {tool_ref}...", end=" ", flush=True)
                resolved = install_from_registry(tool_ref, version)
                print(f"v{resolved.version}")
                installed += 1
            except RegistryError as e:
                print(f"FAILED: {e.message}")
                failed += 1
            except Exception as e:
                print(f"FAILED: {e}")
                failed += 1

        print()
        print(f"Installed: {installed}/{len(tools)}")
        if failed:
            print(f"Failed: {failed}")
            return 1

        print(f"\nCollection '{name}' installed successfully!")

    except RegistryError as e:
        if e.code == "COLLECTION_NOT_FOUND":
            print(f"Collection '{name}' not found.", file=sys.stderr)
            print("List available collections: cmdforge collections list", file=sys.stderr)
        elif e.code == "CONNECTION_ERROR":
            print("Could not connect to the registry.", file=sys.stderr)
        else:
            print(f"Error: {e.message}", file=sys.stderr)
        return 1
    except Exception as e:
        print(f"Error: {e}", file=sys.stderr)
        return 1

    return 0