"""Kiro CLI v2 custom-agent and v3 standalone-hook integration."""

from __future__ import annotations

import os
import shlex
import subprocess
import sys
from typing import Any, Dict, List, Optional, Tuple

from ._file_io import read_json, regular_file_exists, remove_file, write_json_atomic, write_text_atomic
from .base import AgentPlugin, InstallConfig, PluginStatus
from .hook_template import generate_hook_script


AGENT_KEY = "kirocli"
V2_AGENT_NAME = "elydora-audit"
V2_DESCRIPTION = "Kiro CLI with Elydora audit and freeze enforcement"
V3_GUARD_NAME = "elydora-guard"
V3_AUDIT_NAME = "elydora-audit"
ELYDORA_DIR = os.path.join(os.path.expanduser("~"), ".elydora")
V2_AGENT_PATH = os.path.join(
    os.path.expanduser("~"), ".kiro", "agents", f"{V2_AGENT_NAME}.json"
)
V3_HOOKS_PATH = os.path.join(
    os.path.expanduser("~"), ".kiro", "hooks", "elydora-audit.json"
)

JsonObject = Dict[str, Any]
HookContract = Tuple[str, str, str]


class KiroCliPlugin(AgentPlugin):
    """Install Elydora into both supported Kiro CLI hook generations."""

    def install(self, config: InstallConfig) -> None:
        agent_id = config.get("agent_id", "")
        guard_path = config.get("guard_script_path", "")
        if not agent_id:
            raise ValueError("agent_id is required")
        if not guard_path:
            raise ValueError("guard_script_path is required")
        if not regular_file_exists(guard_path, "Elydora guard runtime"):
            raise FileNotFoundError(f"Elydora guard runtime is missing: {guard_path}")

        v2_settings = read_json(V2_AGENT_PATH, "Kiro CLI v2 agent config") or {}
        v3_settings = read_json(V3_HOOKS_PATH, "Kiro CLI v3 hooks config") or {}
        v2_hooks = _hooks_object(v2_settings, "Kiro CLI v2 agent config")
        current_v3_hooks = _v3_hooks(v3_settings)

        v2_hooks["preToolUse"] = [
            *_without_v2_hooks(
                _hook_entries(v2_hooks, "preToolUse", "Kiro CLI v2 agent config")
            ),
            _build_v2_hook(guard_path),
        ]

        agent_dir = os.path.join(ELYDORA_DIR, agent_id)
        hook_path = os.path.join(agent_dir, "hook.py")
        v2_hooks["postToolUse"] = [
            *_without_v2_hooks(
                _hook_entries(v2_hooks, "postToolUse", "Kiro CLI v2 agent config")
            ),
            _build_v2_hook(hook_path),
        ]

        next_v2_settings: JsonObject = {
            "name": V2_AGENT_NAME,
            "description": V2_DESCRIPTION,
            "tools": ["*"],
            "includeMcpJson": True,
            **v2_settings,
            "hooks": v2_hooks,
        }
        next_v3_settings: JsonObject = {
            **v3_settings,
            "version": "v1",
            "hooks": [
                *[hook for hook in current_v3_hooks if not _is_managed_v3_hook(hook)],
                _build_v3_hook(
                    V3_GUARD_NAME,
                    "Block tool use when the Elydora agent is frozen",
                    "PreToolUse",
                    guard_path,
                ),
                _build_v3_hook(
                    V3_AUDIT_NAME,
                    "Record tool use in the Elydora audit trail",
                    "PostToolUse",
                    hook_path,
                ),
            ],
        }

        runtime_config = {
            "org_id": config.get("org_id", ""),
            "agent_id": agent_id,
            "kid": config.get("kid", ""),
            "base_url": config.get("base_url", "https://api.elydora.com"),
            "token": config.get("token", ""),
            "agent_name": config.get("agent_name", AGENT_KEY),
        }
        hook_script = generate_hook_script(
            org_id=config.get("org_id", ""),
            agent_id=agent_id,
            kid=config.get("kid", ""),
            base_url=config.get("base_url", "https://api.elydora.com"),
        )
        write_json_atomic(
            os.path.join(agent_dir, "config.json"),
            runtime_config,
            0o600,
            "Elydora runtime config",
        )
        write_text_atomic(
            os.path.join(agent_dir, "private.key"),
            config.get("private_key", ""),
            0o600,
            "Elydora private key",
        )
        write_text_atomic(hook_path, hook_script, 0o700, "Elydora audit runtime")
        write_json_atomic(V2_AGENT_PATH, next_v2_settings, 0o600, "Kiro CLI v2 agent config")
        write_json_atomic(V3_HOOKS_PATH, next_v3_settings, 0o600, "Kiro CLI v3 hooks config")

        print('Kiro CLI v2: start with "kiro-cli --agent elydora-audit".')
        print('Kiro CLI v3: start with "kiro-cli --v3"; global hooks load automatically.')

    def uninstall(self, agent_id: str = "") -> None:
        v2_settings = read_json(V2_AGENT_PATH, "Kiro CLI v2 agent config")
        v3_settings = read_json(V3_HOOKS_PATH, "Kiro CLI v3 hooks config")

        next_v2: Optional[Tuple[JsonObject, bool]] = None
        if v2_settings is not None:
            v2_hooks = _hooks_object(v2_settings, "Kiro CLI v2 agent config")
            current_pre = _hook_entries(v2_hooks, "preToolUse", "Kiro CLI v2 agent config")
            current_post = _hook_entries(v2_hooks, "postToolUse", "Kiro CLI v2 agent config")
            next_pre = _without_v2_hooks(current_pre, agent_id)
            next_post = _without_v2_hooks(current_post, agent_id)
            if next_pre != current_pre or next_post != current_post:
                v2_hooks["preToolUse"] = next_pre
                v2_hooks["postToolUse"] = next_post
                next_v2 = (
                    {**v2_settings, "hooks": v2_hooks},
                    _is_owned_v2(v2_settings, v2_hooks),
                )

        next_v3: Optional[Tuple[JsonObject, bool]] = None
        if v3_settings is not None:
            current_hooks = _v3_hooks(v3_settings)
            v3_hooks = [
                hook for hook in current_hooks if not _is_managed_v3_hook(hook, agent_id)
            ]
            if v3_hooks != current_hooks:
                owned = all(key in {"version", "hooks"} for key in v3_settings)
                next_v3 = ({**v3_settings, "hooks": v3_hooks}, owned and not v3_hooks)

        if next_v2 is not None:
            settings, remove = next_v2
            if remove:
                remove_file(V2_AGENT_PATH, "Kiro CLI v2 agent config")
            else:
                write_json_atomic(V2_AGENT_PATH, settings, 0o600, "Kiro CLI v2 agent config")

        if next_v3 is not None:
            settings, remove = next_v3
            if remove:
                remove_file(V3_HOOKS_PATH, "Kiro CLI v3 hooks config")
            else:
                write_json_atomic(V3_HOOKS_PATH, settings, 0o600, "Kiro CLI v3 hooks config")

        print("Elydora hooks uninstalled from Kiro CLI.")

    def status(self) -> PluginStatus:
        v2_settings = read_json(V2_AGENT_PATH, "Kiro CLI v2 agent config")
        v3_settings = read_json(V3_HOOKS_PATH, "Kiro CLI v3 hooks config")
        contracts: List[HookContract] = []

        if v2_settings is not None:
            v2_hooks = _hooks_object(v2_settings, "Kiro CLI v2 agent config")
            guard = _find_v2_command(
                _hook_entries(v2_hooks, "preToolUse", "Kiro CLI v2 agent config"),
                "guard.py",
            )
            audit = _find_v2_command(
                _hook_entries(v2_hooks, "postToolUse", "Kiro CLI v2 agent config"),
                "hook.py",
            )
            if guard and audit:
                contracts.append((guard, audit, V2_AGENT_PATH))

        if v3_settings is not None:
            v3_hooks = _v3_hooks(v3_settings)
            guard = _find_v3_command(v3_hooks, V3_GUARD_NAME, "guard.py")
            audit = _find_v3_command(v3_hooks, V3_AUDIT_NAME, "hook.py")
            if guard and audit:
                contracts.append((guard, audit, V3_HOOKS_PATH))

        if not contracts:
            return PluginStatus(installed=False, agent=AGENT_KEY, details="Not installed")

        config_path = contracts[-1][2]
        installed = _runtime_scripts_exist(contracts)
        details = (
            f"Config: {config_path}"
            if installed
            else f"Configured at {config_path}; runtime scripts missing"
        )
        return PluginStatus(installed=installed, agent=AGENT_KEY, details=details)


def _build_command(script_path: str) -> str:
    arguments = [sys.executable, script_path]
    return subprocess.list2cmdline(arguments) if os.name == "nt" else shlex.join(arguments)


def _hooks_object(settings: JsonObject, label: str) -> JsonObject:
    if "hooks" not in settings:
        return {}
    value = settings["hooks"]
    if not isinstance(value, dict):
        raise ValueError(f'{label} field "hooks" must be an object')
    return dict(value)


def _hook_entries(hooks: JsonObject, event: str, label: str) -> List[JsonObject]:
    value = hooks.get(event)
    if value is None:
        return []
    if not isinstance(value, list) or not all(isinstance(item, dict) for item in value):
        raise ValueError(f'{label} field "hooks.{event}" must be an array of objects')
    return value


def _is_managed_command(command: Any, script_name: str, agent_id: str = "") -> bool:
    if not isinstance(command, str):
        return False
    normalized = command.lower()
    if ".elydora" not in normalized or script_name not in normalized:
        return False
    return not agent_id or agent_id in command


def _without_v2_hooks(
    entries: List[JsonObject], agent_id: str = ""
) -> List[JsonObject]:
    return [
        hook
        for hook in entries
        if not _is_managed_command(hook.get("command"), "guard.py", agent_id)
        and not _is_managed_command(hook.get("command"), "hook.py", agent_id)
    ]


def _build_v2_hook(script_path: str) -> JsonObject:
    return {
        "matcher": "*",
        "command": _build_command(script_path),
        "timeout_ms": 5000,
    }


def _is_owned_v2(settings: JsonObject, hooks: JsonObject) -> bool:
    config_keys = {"name", "description", "tools", "includeMcpJson", "hooks"}
    hook_keys = {"preToolUse", "postToolUse"}
    return (
        all(key in config_keys for key in settings)
        and settings.get("name") == V2_AGENT_NAME
        and settings.get("description") == V2_DESCRIPTION
        and settings.get("tools") == ["*"]
        and settings.get("includeMcpJson") is True
        and all(key in hook_keys for key in hooks)
        and all(isinstance(value, list) and not value for value in hooks.values())
    )


def _v3_hooks(settings: JsonObject) -> List[JsonObject]:
    if "version" in settings and settings["version"] != "v1":
        raise ValueError('Kiro CLI v3 hooks config field "version" must be "v1"')
    if "hooks" not in settings:
        return []
    hooks = settings["hooks"]
    if not isinstance(hooks, list) or not all(isinstance(item, dict) for item in hooks):
        raise ValueError('Kiro CLI v3 hooks config field "hooks" must be an array of objects')
    return hooks


def _v3_action_command(hook: JsonObject) -> Any:
    action = hook.get("action")
    return action.get("command") if isinstance(action, dict) else None


def _is_managed_v3_hook(hook: JsonObject, agent_id: str = "") -> bool:
    if hook.get("name") == V3_GUARD_NAME:
        return _is_managed_command(_v3_action_command(hook), "guard.py", agent_id)
    if hook.get("name") == V3_AUDIT_NAME:
        return _is_managed_command(_v3_action_command(hook), "hook.py", agent_id)
    return False


def _build_v3_hook(
    name: str,
    description: str,
    trigger: str,
    script_path: str,
) -> JsonObject:
    return {
        "name": name,
        "description": description,
        "trigger": trigger,
        "matcher": ".*",
        "action": {"type": "command", "command": _build_command(script_path)},
        "timeout": 5,
        "enabled": True,
    }


def _find_v2_command(entries: List[JsonObject], script_name: str) -> Optional[str]:
    for hook in entries:
        command = hook.get("command")
        if _is_managed_command(command, script_name):
            return command
    return None


def _find_v3_command(
    entries: List[JsonObject], name: str, script_name: str
) -> Optional[str]:
    for hook in entries:
        command = _v3_action_command(hook)
        if hook.get("name") == name and _is_managed_command(command, script_name):
            return command
    return None


def _runtime_scripts_exist(contracts: List[HookContract]) -> bool:
    try:
        with os.scandir(ELYDORA_DIR) as iterator:
            entries = sorted(iterator, key=lambda entry: entry.name)
    except FileNotFoundError:
        return False
    except OSError as error:
        raise OSError(f"Read Elydora runtime directory at {ELYDORA_DIR}: {error}") from error

    for entry in entries:
        try:
            is_directory = entry.is_dir(follow_symlinks=False)
        except OSError as error:
            raise OSError(f"Read Elydora runtime entry at {entry.path}: {error}") from error
        if not is_directory:
            continue

        guard_path = os.path.join(entry.path, "guard.py")
        hook_path = os.path.join(entry.path, "hook.py")
        references_runtime = any(
            guard_path in guard and hook_path in audit for guard, audit, _path in contracts
        )
        if not references_runtime:
            continue

        config_path = os.path.join(entry.path, "config.json")
        config = read_json(config_path, "Elydora runtime config")
        if config is None or config.get("agent_name") != AGENT_KEY:
            continue
        return regular_file_exists(
            guard_path, "Elydora guard runtime"
        ) and regular_file_exists(hook_path, "Elydora audit runtime")
    return False