"""Strict, secret-free contract for managed application enrollment.

Enrollment establishes an application identity and its operating boundaries. It
is deliberately separate from a deployment: the caller cannot submit Compose,
host paths, shell commands, callback origins, proxy snippets, or secret values.
"""

from __future__ import annotations

import re
from typing import Literal

from pydantic import BaseModel, ConfigDict, Field, field_validator, model_validator

_APP_ID = re.compile(r"^[a-z][a-z0-9-]{1,62}$")
_REPOSITORY = re.compile(r"^jens/[a-z0-9][a-z0-9._-]{1,80}$")
_REVISION = re.compile(r"^[0-9a-f]{40}$")
_HOSTNAME = re.compile(r"^(?=.{1,253}$)[a-z0-9](?:[a-z0-9-]{0,61}[a-z0-9])?(?:\.[a-z0-9](?:[a-z0-9-]{0,61}[a-z0-9])?)+$")
_RELATIVE_PATH = re.compile(r"^/[a-z0-9][a-z0-9/_-]{0,120}$")
_SUBPATH = re.compile(r"^[a-z0-9][a-z0-9_-]{0,62}$")
_IMAGE = re.compile(r"^[a-z0-9][a-z0-9._/-]{1,180}$")
_IMAGE_TAG = re.compile(r"^[A-Za-z0-9][A-Za-z0-9_.-]{0,127}$")
_VERSION = re.compile(r"^v?[0-9]+\.[0-9]+\.[0-9]+(?:[-+][0-9A-Za-z.-]+)?$")

DeploymentProfileName = Literal[
    "internal-webapp",
    "internal-webapp-oidc",
    "internal-service",
    "repopulse-authenticated",
]


class _StrictModel(BaseModel):
    model_config = ConfigDict(extra="forbid", frozen=True)


class EnrollmentTargetV1(_StrictModel):
    target_type: Literal["gitea-compose-controller"] = "gitea-compose-controller"
    target_identity: str = Field(min_length=3, max_length=80)
    container_name: str = Field(min_length=2, max_length=63)
    # A small reviewed manifest allow-list keeps source locations explicit while
    # allowing the established AppOps artifact layout as well as the default
    # contract for future projects.  It is intentionally not a free path.
    compose_file: Literal[".itworx/deployment.yml", "deploy/appops/compose.yml"] = ".itworx/deployment.yml"
    ownership_label: Literal["tech.itworx.enrollment"] = "tech.itworx.enrollment"

    @field_validator("target_identity")
    @classmethod
    def safe_target_identity(cls, value: str) -> str:
        if not re.fullmatch(r"[a-z][a-z0-9-]{2,79}", value):
            raise ValueError("target_identity must be a bounded lower-case identifier")
        return value

    @field_validator("container_name")
    @classmethod
    def safe_container_name(cls, value: str) -> str:
        if not _APP_ID.fullmatch(value):
            raise ValueError("container_name must be a bounded lower-case identifier")
        return value


class EnrollmentStorageV1(_StrictModel):
    # The v1 profiles own the data layout.  Future profiles may add reviewed
    # alternatives, but enrollment must not turn this into a free host path.
    appdata_subpath: Literal["data"] = "data"
    runtime_uid: int = Field(ge=1, le=65535)
    runtime_gid: int = Field(ge=1, le=65535)
    mount_role: Literal["application-data"] = "application-data"

    @field_validator("appdata_subpath")
    @classmethod
    def safe_subpath(cls, value: str) -> str:
        if not _SUBPATH.fullmatch(value) or value in {".", ".."}:
            raise ValueError("appdata_subpath must be one bounded relative directory")
        return value


class EnrollmentNetworkV1(_StrictModel):
    docker_network: str = Field(min_length=2, max_length=80)
    internal_port: int = Field(ge=1, le=65535)
    host_publish: Literal[False] = False

    @field_validator("docker_network")
    @classmethod
    def safe_network(cls, value: str) -> str:
        if not re.fullmatch(r"[A-Za-z0-9][A-Za-z0-9_.-]{1,79}", value):
            raise ValueError("docker_network must be a bounded Docker network name")
        return value


class EnrollmentExposureV1(_StrictModel):
    hostname: str
    tls_required: Literal[True] = True
    upstream_service: str
    websocket: bool = False
    upload_profile: Literal["standard", "large-upload"] = "standard"
    timeout_profile: Literal["standard", "long-running"] = "standard"

    @field_validator("hostname")
    @classmethod
    def safe_hostname(cls, value: str) -> str:
        normalized = value.lower().rstrip(".")
        if not _HOSTNAME.fullmatch(normalized) or "*" in normalized:
            raise ValueError("hostname must be a concrete DNS hostname")
        return normalized

    @field_validator("upstream_service")
    @classmethod
    def safe_upstream(cls, value: str) -> str:
        if not _APP_ID.fullmatch(value):
            raise ValueError("upstream_service must be a bounded application identifier")
        return value


class EnrollmentRolesV1(_StrictModel):
    administrator: str = "Administrator"
    support_agent: str = "SupportAgent"
    read_only: str = "ReadOnly"

    @field_validator("administrator", "support_agent", "read_only")
    @classmethod
    def safe_role(cls, value: str) -> str:
        if not re.fullmatch(r"[A-Za-z][A-Za-z0-9_-]{1,63}", value):
            raise ValueError("role names must be bounded identifiers")
        return value


class EnrollmentAuthenticationV1(_StrictModel):
    mode: Literal["none", "native-oidc"] = "none"
    redirect_path: str | None = None
    logout_path: str | None = None
    roles: EnrollmentRolesV1 | None = None

    @field_validator("redirect_path", "logout_path")
    @classmethod
    def safe_relative_path(cls, value: str | None) -> str | None:
        if value is None:
            return value
        if not _RELATIVE_PATH.fullmatch(value) or "//" in value or any(item in value for item in ("?", "#", "\\")):
            raise ValueError("OIDC paths must be relative HTTPS application paths")
        return value

    @model_validator(mode="after")
    def validate_mode(self) -> EnrollmentAuthenticationV1:
        if self.mode == "native-oidc" and (not self.redirect_path or self.roles is None):
            raise ValueError("native-oidc requires a redirect_path and a complete role model")
        if self.mode == "none" and any((self.redirect_path, self.logout_path, self.roles)):
            raise ValueError("authentication details are only valid for native-oidc")
        return self


class EnrollmentArtifactV1(_StrictModel):
    release_version: str
    image_repository: str
    image_tag: str
    health_path: str = "/health"

    @field_validator("release_version")
    @classmethod
    def valid_version(cls, value: str) -> str:
        if not _VERSION.fullmatch(value):
            raise ValueError("release_version must be a semantic version")
        return value.removeprefix("v")

    @field_validator("image_repository")
    @classmethod
    def valid_image(cls, value: str) -> str:
        normalized = value.lower()
        if not _IMAGE.fullmatch(normalized):
            raise ValueError("image_repository must be a bounded image name")
        return normalized

    @field_validator("image_tag")
    @classmethod
    def valid_tag(cls, value: str) -> str:
        if value.lower() == "latest" or not _IMAGE_TAG.fullmatch(value):
            raise ValueError("image_tag must be explicit and cannot be latest")
        return value

    @field_validator("health_path")
    @classmethod
    def valid_health_path(cls, value: str) -> str:
        if not _RELATIVE_PATH.fullmatch(value) or "//" in value or any(item in value for item in ("?", "#", "\\")):
            raise ValueError("health_path must be a bounded relative path")
        return value


class EnrollmentSecretsV1(_StrictModel):
    oidc_client_secret_required: bool = False
    additional_secret_refs: tuple[str, ...] = ()

    @field_validator("additional_secret_refs")
    @classmethod
    def references_only(cls, value: tuple[str, ...]) -> tuple[str, ...]:
        if len(value) > 8 or len(set(value)) != len(value):
            raise ValueError("additional_secret_refs must contain up to eight unique references")
        for reference in value:
            if not re.fullmatch(r"[A-Z][A-Z0-9_]{2,95}", reference):
                raise ValueError("secret requirements must be references, never values")
        return value


class EnrollmentPolicyV1(_StrictModel):
    deployment_apply: Literal[True] = True
    deployment_rollback: Literal[True] = True
    autonomous_profile: Literal[True] = True


class EnrollmentPlanV1(_StrictModel):
    api_version: Literal["itworx.enrollment/v1"] = "itworx.enrollment/v1"
    application_id: str
    display_name: str = Field(min_length=2, max_length=100)
    environment: Literal["production", "staging"] = "production"
    repository: str
    revision: str
    profile: DeploymentProfileName
    target: EnrollmentTargetV1
    storage: EnrollmentStorageV1
    network: EnrollmentNetworkV1
    artifact: EnrollmentArtifactV1
    exposure: EnrollmentExposureV1 | None = None
    authentication: EnrollmentAuthenticationV1 = EnrollmentAuthenticationV1()
    secrets: EnrollmentSecretsV1 = EnrollmentSecretsV1()
    policy: EnrollmentPolicyV1 = EnrollmentPolicyV1()

    @field_validator("application_id")
    @classmethod
    def safe_application_id(cls, value: str) -> str:
        if not _APP_ID.fullmatch(value):
            raise ValueError("application_id must be a bounded lower-case identifier")
        return value

    @field_validator("display_name")
    @classmethod
    def safe_display_name(cls, value: str) -> str:
        normalized = value.strip()
        if not normalized or any(character in normalized for character in "\r\n<>"):
            raise ValueError("display_name contains unsupported characters")
        return normalized

    @field_validator("repository")
    @classmethod
    def safe_repository(cls, value: str) -> str:
        normalized = value.lower()
        if not _REPOSITORY.fullmatch(normalized):
            raise ValueError("repository must be a canonical Jens repository")
        return normalized

    @field_validator("revision")
    @classmethod
    def immutable_revision(cls, value: str) -> str:
        normalized = value.lower()
        if not _REVISION.fullmatch(normalized):
            raise ValueError("revision must be a full lower-case 40-character Git SHA")
        return normalized

    @model_validator(mode="after")
    def validate_profile_contract(self) -> EnrollmentPlanV1:
        if self.target.container_name != self.application_id:
            raise ValueError("target.container_name must equal application_id")
        if self.profile == "internal-service":
            if self.exposure is not None or self.authentication.mode != "none":
                raise ValueError("internal-service cannot request public exposure or OIDC")
        elif self.exposure is None:
            raise ValueError("web application profiles require managed HTTPS exposure")
        if self.exposure and self.exposure.upstream_service != self.application_id:
            raise ValueError("exposure.upstream_service must equal application_id")
        expects_oidc = self.profile == "internal-webapp-oidc"
        if expects_oidc != (self.authentication.mode == "native-oidc"):
            raise ValueError("profile and authentication mode must match")
        if expects_oidc != self.secrets.oidc_client_secret_required:
            raise ValueError("OIDC secret requirement must match the selected profile")
        if self.profile == "repopulse-authenticated" and (
            self.application_id != "repopulse"
            or self.repository != "jens/repopulse"
            or self.environment != "production"
            or self.target.container_name != "repopulse"
            or self.target.compose_file != ".itworx/deployment.yml"
            or self.storage.appdata_subpath != "data"
            or self.storage.runtime_uid != 10001
            or self.storage.runtime_gid != 10001
            or self.network.docker_network != "itworx-mcp-hub-npm"
            or self.network.internal_port != 8000
            or self.artifact.image_repository != "repopulse-managed"
            or self.artifact.image_tag != "production"
            or self.artifact.health_path != "/health"
            or self.exposure is None
            or self.exposure.hostname != "repopulse.example.com"
            or self.exposure.upstream_service != "repopulse"
            or self.authentication.mode != "none"
            or self.secrets.additional_secret_refs != ("REPOPULSE_GITEA_TOKEN",)
        ):
            raise ValueError("repopulse-authenticated must use the fixed RepoPulse managed target contract")
        return self

    @property
    def appdata_path(self) -> str:
        return f"/srv/example/appdata/{self.application_id}"

    @property
    def data_path(self) -> str:
        return f"{self.appdata_path}/{self.storage.appdata_subpath}"

    @property
    def public_url(self) -> str | None:
        return f"https://{self.exposure.hostname}" if self.exposure else None


class EnrollmentTrustConfigV1(_StrictModel):
    """Root-owned boundaries; secret values remain in the encrypted store."""

    controller_identity: str
    bootstrap_secret_ref: str
    trusted_appdata_root: Literal["/srv/example/appdata"] = "/srv/example/appdata"
    approved_networks: tuple[str, ...] = ()
    allowed_domain_suffixes: tuple[str, ...] = ()
    autonomous_profiles: tuple[DeploymentProfileName, ...] = ()
    repopulse_proxy_access_list_id: int | None = Field(default=None, strict=True, ge=1, le=2_147_483_647)
    oidc_issuer: str | None = None
    oidc_role_claim: Literal["roles"] = "roles"
    administrator_group: str | None = None
    support_agent_group: str | None = None
    read_only_group: str | None = None

    @field_validator("controller_identity")
    @classmethod
    def trusted_controller(cls, value: str) -> str:
        if not re.fullmatch(r"[a-z][a-z0-9-]{2,79}", value):
            raise ValueError("controller_identity must be a bounded lower-case identifier")
        return value

    @field_validator("bootstrap_secret_ref")
    @classmethod
    def trusted_secret_ref(cls, value: str) -> str:
        if not re.fullmatch(r"[A-Z][A-Z0-9_]{2,95}", value):
            raise ValueError("bootstrap_secret_ref must be a secret reference")
        return value

    @field_validator("approved_networks")
    @classmethod
    def trusted_networks(cls, value: tuple[str, ...]) -> tuple[str, ...]:
        if not value or len(value) > 8 or len(set(value)) != len(value):
            raise ValueError("approved_networks must contain one to eight unique networks")
        for item in value:
            if not re.fullmatch(r"[A-Za-z0-9][A-Za-z0-9_.-]{1,79}", item):
                raise ValueError("approved network name is invalid")
        return value

    @field_validator("allowed_domain_suffixes")
    @classmethod
    def trusted_suffixes(cls, value: tuple[str, ...]) -> tuple[str, ...]:
        if len(value) > 16 or len(set(value)) != len(value):
            raise ValueError("allowed_domain_suffixes must be unique")
        for item in value:
            normalized = item.lower().lstrip(".")
            if not _HOSTNAME.fullmatch(normalized) or "*" in normalized:
                raise ValueError("allowed domain suffix must be a concrete DNS suffix")
        return tuple(item.lower().lstrip(".") for item in value)

    @field_validator("oidc_issuer")
    @classmethod
    def issuer_is_https(cls, value: str | None) -> str | None:
        if value is not None and not re.fullmatch(r"https://[a-z0-9.-]+(?:/[a-z0-9._~/-]*)?", value):
            raise ValueError("oidc_issuer must be an HTTPS URL without query or fragment")
        return value.rstrip("/") if value else value

    @model_validator(mode="after")
    def validate_oidc_groups(self) -> EnrollmentTrustConfigV1:
        groups = (self.administrator_group, self.support_agent_group, self.read_only_group)
        if any(groups) and not all(groups):
            raise ValueError("all three configured OIDC role groups are required together")
        for group in groups:
            if group is not None and not re.fullmatch(r"[A-Za-z0-9 _.-]{2,100}", group):
                raise ValueError("OIDC role group name is invalid")
        return self