"""Manifest dataclasses (PRD 0011 layout).

Reads the per-file manifest tree:

  $HOME/.bot-bottle/bottles/<name>.md   — one bottle per file
  $HOME/.bot-bottle/agents/<name>.md    — home-resident agents
  $CWD/.bot-bottle/agents/<name>.md     — cwd-supplied agents

Each file is Markdown with YAML frontmatter. The frontmatter holds
the structured config (see schema below); for agents the body is
the system prompt, for bottles the body is human documentation
(ignored by the parser).

Bottle schema (frontmatter):
  extends:      <bottle-name>                   # optional (PRD 0025)
  env:          { <NAME>: <env-entry>, ... }
  git-gate:                                     # optional (PRD 0047)
    user:       { name: <str>, email: <str> }   # optional
    repos:      { <name>: <git-gate-entry>, ... }  # optional
  egress: { routes: [ <egress-route>, ... ] }
    # route keys: host, matches, auth, role, dlp
  supervise:    <bool>                          # optional

Agent schema (frontmatter):
  bottle:        <bottle-name>          # required
  skills:        [ <skill-name>, ... ]   # optional
  git-gate:
    user:        { name: <str>, email: <str> }  # optional; overlays bottle
  # Claude Code subagent passthrough fields — accepted, ignored:
  name, description, model, color, memory

The agent file's Markdown body is the system prompt (stripped).
Unknown top-level frontmatter keys raise ManifestError with a hint.

Bottles can ONLY live under $HOME. A bottles/ dir under $CWD is a
warn at load time and contributes nothing. The trust boundary is
expressed as filesystem layout rather than resolver logic.

Validation runs once at load. Manifest.from_json_obj is preserved
as a programmatic entry point (used by tests) that takes a dict
with the same field names — useful for building manifests without
on-disk files.
"""

from __future__ import annotations

import os
from dataclasses import dataclass, field, replace
from pathlib import Path
from typing import Mapping

from .manifest_util import ManifestError, as_json_object
from .manifest_agent import ManifestAgent, ManifestAgentProvider
from .manifest_egress import (
    EGRESS_AUTH_SCHEMES,
    ManifestEgressConfig,
    ManifestEgressRoute,
)
from .manifest_git import ManifestGitEntry, ManifestGitUser, parse_git_gate_config
from .manifest_schema import BOTTLE_KEYS

# Re-export everything that callers currently import from this module.
__all__ = [
    "ManifestError",
    "ManifestGitEntry",
    "ManifestGitUser",
    "ManifestAgentProvider",
    "EGRESS_AUTH_SCHEMES",
    "ManifestEgressRoute",
    "ManifestEgressConfig",
    "ManifestAgent",
    "ManifestBottle",
    "Manifest",
]


def _empty_str_dict() -> dict[str, str]:
    return {}


def _section_dict(value: object, label: str) -> dict[str, object]:
    """Like as_json_object but treats absent/null as an empty section."""
    if value is None:
        return {}
    return as_json_object(value, label)


@dataclass(frozen=True)
class ManifestBottle:
    env: Mapping[str, str] = field(default_factory=_empty_str_dict)
    agent_provider: ManifestAgentProvider = field(default_factory=ManifestAgentProvider)
    git: tuple[ManifestGitEntry, ...] = ()
    # Per-bottle git identity (issue #86). Empty default — bottles
    # that don't set `git-gate.user:` in the manifest skip the
    # `git config --global` step entirely. A bottle can declare a user
    # identity without any git-gate.repos upstreams, and vice versa.
    git_user: ManifestGitUser = field(default_factory=ManifestGitUser)
    egress: ManifestEgressConfig = field(default_factory=ManifestEgressConfig)
    # Opt-in per-bottle stuck-recovery sidecar (PRD 0013). When true,
    # the launch step brings up a supervise sidecar that exposes MCP
    # tools to the agent (egress-block, capability-block) plus mounts
    # the current-config dir read-only into the agent at
    # /etc/bot-bottle/current-config. False (the default) skips the
    # sidecar and mount.
    supervise: bool = False

    @classmethod
    def from_dict(cls, name: str, raw: object) -> "ManifestBottle":
        d = as_json_object(raw, f"bottle '{name}'")

        if "runtime" in d:
            raise ManifestError(
                f"bottle '{name}' has a 'runtime' field, which is no longer "
                f"supported. gVisor (runsc) is now auto-detected by the "
                f"backend; remove the 'runtime' field from the bottle "
                f"definition."
            )

        if "ssh" in d:
            raise ManifestError(
                f"bottle '{name}' has an 'ssh' field, which has been removed "
                f"(PRD 0009). Declare upstreams under 'git-gate.repos' with "
                f"url + identity + host_key; the git-gate sidecar (PRD 0008) "
                f"holds the credential and gitleaks-scans pushes."
            )

        if "git" in d:
            raise ManifestError(
                f"bottle '{name}' uses 'git' which has been replaced by "
                f"'git-gate' (PRD 0047). Move git.user → git-gate.user "
                f"and git.remotes → git-gate.repos (fields: url, identity, host_key)."
            )

        if "git_user" in d:
            raise ManifestError(
                f"bottle '{name}' has a 'git_user' field, which has been "
                f"removed. Move it under 'git-gate.user'."
            )

        unknown = set(d.keys()) - BOTTLE_KEYS
        if unknown:
            allowed = ", ".join(sorted(BOTTLE_KEYS))
            raise ManifestError(
                f"bottle '{name}' has unknown key(s) {sorted(unknown)}; "
                f"allowed keys are {allowed}."
            )

        env: dict[str, str] = {}
        env_raw = d.get("env")
        if env_raw is not None:
            env_dict = as_json_object(env_raw, f"bottle '{name}' env")
            for var, value in env_dict.items():
                if not isinstance(value, str):
                    raise ManifestError(
                        f"env entry {var} in bottle '{name}' must be a JSON string "
                        f"(was {type(value).__name__}). Use \"?<message>\" for prompt-at-runtime."
                    )
                env[var] = value

        git: tuple[ManifestGitEntry, ...] = ()
        git_user = ManifestGitUser()
        git_raw = d.get("git-gate")
        if git_raw is not None:
            git, git_user = parse_git_gate_config(name, git_raw)

        agent_provider = (
            ManifestAgentProvider.from_dict(name, d["agent_provider"])
            if "agent_provider" in d
            else ManifestAgentProvider()
        )

        egress = (
            ManifestEgressConfig.from_dict(name, d["egress"])
            if "egress" in d
            else ManifestEgressConfig()
        )

        supervise_raw = d.get("supervise", False)
        if not isinstance(supervise_raw, bool):
            raise ManifestError(
                f"bottle '{name}' supervise must be a boolean "
                f"(was {type(supervise_raw).__name__})"
            )

        return cls(
            env=env, agent_provider=agent_provider, git=git,
            git_user=git_user, egress=egress, supervise=supervise_raw,
        )


@dataclass(frozen=True)
class Manifest:
    bottles: Mapping[str, ManifestBottle]
    agents: Mapping[str, ManifestAgent]

    @classmethod
    def resolve(cls, cwd: str, *, missing_ok: bool = False) -> "Manifest":
        """Walk the per-file manifest tree and build a Manifest.

        Layout (PRD 0011):
          $HOME/.bot-bottle/bottles/<name>.md  — bottles (home-only)
          $HOME/.bot-bottle/agents/<name>.md   — home agents
          $CWD/.bot-bottle/agents/<name>.md    — cwd agents

        Cwd agents merge into the home agents on the same name
        (cwd wins). A bottles/ subdir under $CWD is logged as a
        warning and ignored — the filesystem layout IS the trust
        boundary.

        If `missing_ok` is true, a missing `$HOME/.bot-bottle/`
        returns an empty manifest instead of dying. This is for
        passive UI surfaces like the dashboard, which can still
        monitor already-running agents without launch config.

        If `bot-bottle.json` exists alongside a missing
        `.bot-bottle/` directory at either side, dies with a
        clear pointer at the README's manifest section — the
        manifest format changed in PRD 0011 and we don't silently
        fall back."""
        home_dir = Path(os.environ["HOME"])
        cwd_dir = Path(cwd)
        home_md = home_dir / ".bot-bottle"
        cwd_md = cwd_dir / ".bot-bottle"

        from .manifest_loader import check_stale_json

        check_stale_json(home_dir, home_md, "$HOME")
        if cwd_dir.resolve() != home_dir.resolve():
            check_stale_json(cwd_dir, cwd_md, "$CWD")

        if not home_md.is_dir():
            if missing_ok:
                return cls.from_json_obj({"bottles": {}, "agents": {}})
            raise ManifestError(
                f"no manifest found: {home_md} does not exist. "
                f"See README.md for the per-file Markdown layout "
                f"(PRD 0011)."
            )

        # When CWD == HOME (running from $HOME directly), pass the
        # same dir for both — _load_md_dirs will dedupe.
        cwd_md_arg = cwd_md if cwd_md.is_dir() and cwd_dir.resolve() != home_dir.resolve() else None
        return cls.from_md_dirs(home_md, cwd_md_arg)

    @classmethod
    def from_md_dirs(
        cls,
        home_dir: Path,
        cwd_dir: Path | None,
    ) -> "Manifest":
        """Programmatic entry point. Loads bottles from
        `<home_dir>/bottles/`, home agents from `<home_dir>/agents/`,
        and (if `cwd_dir` is passed) cwd agents from
        `<cwd_dir>/agents/`. Cwd agents override home agents on
        name collision. A `bottles/` subdir under `cwd_dir` is
        logged as a warning and ignored.

        Used by tests to build a Manifest from fixture directories
        without touching `os.environ`."""
        bottles_dir = home_dir / "bottles"
        from .manifest_loader import load_agents_from_dir, load_bottles_from_dir

        bottles = load_bottles_from_dir(bottles_dir)

        bottle_names = set(bottles.keys())
        agents_dir = home_dir / "agents"
        agents = load_agents_from_dir(agents_dir, bottle_names, source="$HOME")

        if cwd_dir is not None:
            stale_bottles = cwd_dir / "bottles"
            if stale_bottles.is_dir():
                files = sorted(stale_bottles.glob("*.md"))
                if files:
                    names = ", ".join(p.name for p in files)
                    from .log import warn
                    warn(
                        f"ignoring bottle file(s) under "
                        f"{stale_bottles}: {names}. Bottles can only "
                        f"live under $HOME/.bot-bottle/bottles/ "
                        f"(PRD 0011). Move them or delete."
                    )
            cwd_agents_dir = cwd_dir / "agents"
            cwd_agents = load_agents_from_dir(
                cwd_agents_dir, bottle_names, source="$CWD"
            )
            agents = {**agents, **cwd_agents}

        return cls(bottles=bottles, agents=agents)

    @classmethod
    def from_json_obj(cls, obj: object) -> "Manifest":
        """Validate and build a Manifest from a raw JSON-like dict."""
        d = as_json_object(obj, "manifest")
        raw_bottles_obj = _section_dict(d.get("bottles"), "manifest 'bottles'")
        raw_agents = _section_dict(d.get("agents"), "manifest 'agents'")

        # Coerce each bottle's raw to dict[str, object] so the
        # PRD 0025 resolver can apply extends-merge rules
        # consistently with the md-loader path.
        raw_bottles: dict[str, dict[str, object]] = {}
        for n, b in raw_bottles_obj.items():
            raw_bottles[n] = as_json_object(b, f"bottle '{n}'")
        from .manifest_extends import resolve_bottles

        bottles = resolve_bottles(raw_bottles)

        bottle_names = set(bottles.keys())
        agents: dict[str, ManifestAgent] = {
            n: ManifestAgent.from_dict(n, a, bottle_names) for n, a in raw_agents.items()
        }
        return cls(bottles=bottles, agents=agents)

    def has_agent(self, name: str) -> bool:
        return name in self.agents

    def require_agent(self, name: str) -> None:
        if self.has_agent(name):
            return
        available = ", ".join(self.agents.keys())
        if available:
            msg = f"agent '{name}' not defined in bot-bottle.json. Available: {available}"
            raise ManifestError(msg)
        raise ManifestError(
            f"agent '{name}' not defined in bot-bottle.json (manifest is empty)."
        )

    def has_bottle(self, name: str) -> bool:
        return name in self.bottles

    def require_bottle(self, name: str) -> None:
        if self.has_bottle(name):
            return
        available = ", ".join(self.bottles.keys())
        if available:
            raise ManifestError(
                f"bottle '{name}' not defined in bot-bottle.json. "
                f"Available bottles: {available}"
            )
        raise ManifestError(f"bottle '{name}' not defined in bot-bottle.json (no bottles defined).")

    def _effective_git_user(self, agent_name: str) -> ManifestGitUser:
        """Merge the agent's git.user over the referenced bottle's,
        per-field, agent-wins-on-non-empty (issue #94). Same overlay
        the `extends:` resolver applies between bottles
        (`_merge_bottles`)."""
        agent = self.agents[agent_name]
        base = self.bottles[agent.bottle].git_user
        over = agent.git_user
        if over.is_empty():
            return base
        return ManifestGitUser(
            name=over.name or base.name,
            email=over.email or base.email,
        )

    def bottle_for(self, agent_name: str) -> ManifestBottle:
        """Resolve the Bottle the named agent references, with the
        agent's git.user overlaid on top. The validator guarantees both
        lookups succeed for a manifest built via from_json_obj.

        The overlay lives here, the single point both backends call to
        resolve an agent's bottle, so the docker / smolmachines git
        provisioners pick up the merged identity unchanged."""
        bottle = self.bottles[self.agents[agent_name].bottle]
        merged = self._effective_git_user(agent_name)
        if merged == bottle.git_user:
            return bottle
        return replace(bottle, git_user=merged)

    def git_identity_summary(self, agent_name: str) -> str | None:
        """One-line effective git identity with per-field provenance
        for launch summaries, e.g.
        `name=claude (agent), email=eric@dideric.is (bottle)`.
        Returns None when neither agent nor bottle sets an identity."""
        over = self.agents[agent_name].git_user
        merged = self._effective_git_user(agent_name)
        if merged.is_empty():
            return None
        parts: list[str] = []
        if merged.name:
            parts.append(f"name={merged.name} ({'agent' if over.name else 'bottle'})")
        if merged.email:
            parts.append(f"email={merged.email} ({'agent' if over.email else 'bottle'})")
        return ", ".join(parts)