"""Skill Repository CLI commands for CrewAI."""

from __future__ import annotations

import base64
import io
import json
import os
from pathlib import Path
import tarfile
import zipfile

from rich.console import Console
from rich.table import Table

from crewai_cli.command import BaseCommand, PlusAPIMixin
from crewai_cli.config import Settings
from crewai_cli.constants import DEFAULT_CREWAI_ENTERPRISE_URL


console = Console()

_SKILL_MD_TEMPLATE = """\
---
name: {name}
version: 0.1.0
description: |
  A short description of what this skill does.
---

## Instructions

Describe the skill behaviour here. This section is shown to the agent at activation time.
"""


class SkillCommand(BaseCommand, PlusAPIMixin):
    """Skill Repository related operations for CrewAI projects."""

    def __init__(self) -> None:
        BaseCommand.__init__(self)
        PlusAPIMixin.__init__(self, telemetry=self._telemetry)

    # ------------------------------------------------------------------
    # create
    # ------------------------------------------------------------------

    def create(self, name: str, in_project: bool = True) -> None:
        """Scaffold a new skill directory.

        If pyproject.toml is present (crew project), creates ./skills/{name}/.
        Otherwise creates ./{name}/.
        """
        if in_project and os.path.isfile("pyproject.toml"):
            skill_dir = Path("skills") / name
        else:
            skill_dir = Path(name)

        if skill_dir.exists():
            console.print(f"[red]Directory {skill_dir} already exists.[/red]")
            raise SystemExit(1)

        skill_dir.mkdir(parents=True)
        (skill_dir / "scripts").mkdir()
        (skill_dir / "references").mkdir()
        (skill_dir / "assets").mkdir()

        skill_md = skill_dir / "SKILL.md"
        skill_md.write_text(_SKILL_MD_TEMPLATE.format(name=name))

        console.print(
            f"[green]Created skill [bold]{name}[/bold] at [bold]{skill_dir}[/bold].[/green]"
        )
        console.print(f"Edit [bold]{skill_md}[/bold] to define the skill instructions.")

    # ------------------------------------------------------------------
    # install
    # ------------------------------------------------------------------

    def install(self, ref: str) -> None:
        """Download and install a registry skill.

        Format: @org/name

        Inside a crew project (pyproject.toml present): installs to ./skills/{name}/
        Outside a project: installs to ~/.crewai/skills/{org}/{name}/
        """
        if not ref.startswith("@"):
            console.print(
                "[red]Invalid skill reference. Use the format @org/name.[/red]"
            )
            raise SystemExit(1)

        without_at = ref[1:]
        if without_at.count("/") != 1:
            console.print(
                "[red]Invalid skill reference. Use the format @org/name.[/red]"
            )
            raise SystemExit(1)

        org, name = without_at.split("/", 1)
        if (
            not org
            or not name
            or org.startswith(".")
            or name.startswith(".")
            or len(Path(org).parts) != 1
            or len(Path(name).parts) != 1
        ):
            console.print(
                "[red]Invalid skill reference: org and name must be single, "
                "non-empty path segments (no slashes, no '..').[/red]"
            )
            raise SystemExit(1)

        self._print_current_organization()
        console.print(f"[bold blue]Downloading skill {ref}...[/bold blue]")

        get_response = self.plus_api_client.get_skill(org, name)

        if get_response.status_code == 404:
            console.print(
                f"[red]Skill {ref} not found. Ensure it has been published and you have access.[/red]"
            )
            raise SystemExit(1)
        if get_response.status_code != 200:
            console.print(
                f"[red]Failed to download skill {ref}: {get_response.status_code}[/red]"
            )
            raise SystemExit(1)

        data = get_response.json()
        version = data.get("latest_version") or data.get("version")

        download_url = data.get("download_url")
        if download_url:
            import httpx

            dl_response = httpx.get(download_url, follow_redirects=True)
            dl_response.raise_for_status()
            archive_bytes = dl_response.content
        else:
            encoded = data.get("file", "")
            if "," in encoded:
                encoded = encoded.split(",", 1)[1]
            archive_bytes = base64.b64decode(encoded)

        in_project = os.path.isfile("pyproject.toml")
        if in_project:
            dest = Path("skills") / name
            dest.mkdir(parents=True, exist_ok=True)
            self._unpack_archive(archive_bytes, dest)
            console.print(
                f"[green]Installed [bold]{ref}[/bold]{' (' + version + ')' if version else ''} to [bold]{dest}[/bold].[/green]"
            )
        else:
            try:
                from crewai.skills.cache import SkillCacheManager

                cache = SkillCacheManager()
                cache.store(org, name, version, archive_bytes)
            except ImportError:
                # Fallback if SDK not installed — write directly
                cache_dir = Path.home() / ".crewai" / "skills" / org / name
                if cache_dir.exists():
                    import shutil

                    shutil.rmtree(cache_dir)
                cache_dir.mkdir(parents=True, exist_ok=True)
                self._unpack_archive(archive_bytes, cache_dir)
                # Write metadata so `crewai skill list` can discover it
                from datetime import datetime, timezone

                meta = {
                    "org": org,
                    "name": name,
                    "version": version,
                    "installed_at": datetime.now(tz=timezone.utc).isoformat(),
                }
                (cache_dir / ".crewai_meta.json").write_text(json.dumps(meta, indent=2))
            console.print(
                f"[green]Installed [bold]{ref}[/bold]{' (' + version + ')' if version else ''} to global cache.[/green]"
            )

    # ------------------------------------------------------------------
    # publish
    # ------------------------------------------------------------------

    def publish(self, is_public: bool, org: str | None, force: bool = False) -> None:
        """Publish the skill in the current directory to the registry."""
        skill_md = Path("SKILL.md")
        if not skill_md.exists():
            console.print(
                "[red]No SKILL.md found in current directory. "
                "Run this command from inside a skill directory.[/red]"
            )
            raise SystemExit(1)

        # Parse frontmatter to extract name + version
        try:
            frontmatter = self._parse_frontmatter(skill_md.read_text())
        except ValueError as exc:
            console.print(f"[red]Failed to parse SKILL.md frontmatter: {exc}[/red]")
            raise SystemExit(1) from exc

        name = frontmatter.get("name")
        version = frontmatter.get("version")
        description = frontmatter.get("description")

        if not name:
            console.print(
                "[red]SKILL.md frontmatter must include a 'name' field.[/red]"
            )
            raise SystemExit(1)

        if not version:
            console.print(
                "[red]SKILL.md frontmatter must include a 'version' field before publishing.[/red]"
            )
            raise SystemExit(1)

        settings = Settings()
        effective_org = org or settings.org_name
        if not effective_org:
            console.print(
                "[red]No organisation set. Run `crewai org switch <org_id>` first, "
                "or pass --org.[/red]"
            )
            raise SystemExit(1)

        self._print_current_organization()
        console.print(
            f"[bold blue]Publishing skill [bold]{name}[/bold] v{version} to {effective_org}...[/bold blue]"
        )

        archive_bytes = self._build_skill_tarball()
        encoded_file = "data:application/x-gzip;base64," + base64.b64encode(
            archive_bytes
        ).decode("utf-8")

        response = self.plus_api_client.publish_skill(
            org=effective_org,
            name=name,
            version=version,
            is_public=is_public,
            description=description,
            encoded_file=encoded_file,
        )

        self._validate_response(response)

        base_url = settings.enterprise_base_url or DEFAULT_CREWAI_ENTERPRISE_URL
        console.print(
            f"[green]Published [bold]{effective_org}/{name}[/bold] v{version}.\n\n"
            "Security checks are running in the background. "
            "Your skill will be available once checks complete.\n"
            f"Monitor status at: {base_url}/crewai_plus/skills/{effective_org}/{name}[/green]"
        )

    # ------------------------------------------------------------------
    # list_cached
    # ------------------------------------------------------------------

    def list_cached(self) -> None:
        """Show locally installed skills."""
        table = Table(title="Installed Skills", show_lines=True)
        table.add_column("Source", style="dim")
        table.add_column("Ref")
        table.add_column("Version")
        table.add_column("Path")

        # Project-local ./skills/
        local_skills_dir = Path("skills")
        if local_skills_dir.is_dir():
            for skill_dir in sorted(local_skills_dir.iterdir()):
                if skill_dir.is_dir() and (skill_dir / "SKILL.md").exists():
                    version = self._read_version(skill_dir / "SKILL.md")
                    table.add_row(
                        "project",
                        skill_dir.name,
                        version or "-",
                        str(skill_dir),
                    )

        # Global cache
        cache_root = Path.home() / ".crewai" / "skills"
        if cache_root.exists():
            for org_dir in sorted(cache_root.iterdir()):
                if not org_dir.is_dir():
                    continue
                for skill_dir in sorted(org_dir.iterdir()):
                    meta_file = skill_dir / ".crewai_meta.json"
                    if meta_file.exists():
                        try:
                            meta = json.loads(meta_file.read_text())
                            table.add_row(
                                "cache",
                                f"@{meta['org']}/{meta['name']}",
                                meta.get("version") or "-",
                                str(skill_dir),
                            )
                        except (json.JSONDecodeError, KeyError):
                            console.print(
                                f"[yellow]Warning: skipping malformed cache entry at {meta_file}[/yellow]"
                            )

        console.print(table)

    # ------------------------------------------------------------------
    # internal helpers
    # ------------------------------------------------------------------

    def _print_current_organization(self) -> None:
        settings = Settings()
        if settings.org_uuid:
            console.print(
                f"Current organization: {settings.org_name} ({settings.org_uuid})",
                style="bold blue",
            )
        else:
            console.print(
                "No organization currently set. We recommend setting one before using: "
                "`crewai org switch <org_id>` command.",
                style="yellow",
            )

    def _unpack_archive(self, archive_bytes: bytes, dest: Path) -> None:
        """Unpack a .tar.gz or .zip archive into dest."""
        # Try tar first, then zip
        try:
            with tarfile.open(fileobj=io.BytesIO(archive_bytes), mode="r:gz") as tf:
                try:
                    tf.extractall(dest, filter="data")
                except TypeError:
                    _safe_extractall(tf, dest)
            return
        except tarfile.TarError:
            pass

        # Fallback: zip
        with zipfile.ZipFile(io.BytesIO(archive_bytes)) as zf:
            _safe_extract_zip(zf, dest)

    def _build_skill_tarball(self) -> bytes:
        """Build an in-memory .tar.gz of SKILL.md + scripts/ + references/ + assets/."""
        buf = io.BytesIO()
        with tarfile.open(fileobj=buf, mode="w:gz") as tf:
            tf.add("SKILL.md")
            for folder in ("scripts", "references", "assets"):
                folder_path = Path(folder)
                if folder_path.is_dir():
                    for fpath in sorted(folder_path.rglob("*")):
                        if fpath.is_file():
                            tf.add(str(fpath))
        return buf.getvalue()

    def _parse_frontmatter(self, content: str) -> dict[str, str]:
        """Extract YAML frontmatter fields from a SKILL.md string.

        Reuses crewai.skills.parser when available, with a minimal
        fallback for environments where the full SDK isn't installed.
        """
        try:
            from crewai.skills.parser import parse_frontmatter

            fm_dict, _ = parse_frontmatter(content)
            return fm_dict
        except ImportError:
            pass

        # Fallback: minimal YAML parsing without SDK dependency
        import re

        match = re.match(r"^---\n(.*?)\n---", content, re.DOTALL)
        if not match:
            raise ValueError("No YAML frontmatter block found")
        try:
            import yaml

            return yaml.safe_load(match.group(1)) or {}
        except ImportError:
            result: dict[str, str] = {}
            for line in match.group(1).splitlines():
                if ":" in line:
                    key, _, value = line.partition(":")
                    result[key.strip()] = value.strip()
            return result

    def _read_version(self, skill_md: Path) -> str | None:
        """Read the version field from a SKILL.md file, or None."""
        try:
            fm = self._parse_frontmatter(skill_md.read_text())
            return fm.get("version")
        except Exception:
            return None


def _safe_extractall(tf: tarfile.TarFile, dest: Path) -> None:
    """Path-traversal-safe extraction for Python < 3.12."""
    dest_resolved = dest.resolve()
    for member in tf.getmembers():
        member_path = (dest / member.name).resolve()
        if not member_path.is_relative_to(dest_resolved):
            raise ValueError(f"Blocked path traversal attempt: {member.name!r}")
    tf.extractall(dest)  # noqa: S202


def _safe_extract_zip(zf: zipfile.ZipFile, dest: Path) -> None:
    """Path-traversal-safe ZIP extraction."""
    dest_resolved = dest.resolve()
    for member in zf.namelist():
        member_path = (dest / member).resolve()
        if not member_path.is_relative_to(dest_resolved):
            raise ValueError(f"Blocked path traversal attempt: {member!r}")
    zf.extractall(dest)  # noqa: S202