from __future__ import annotations

from datetime import datetime
from enum import Enum
import re

from pydantic import BaseModel, Field


class ServiceName(str, Enum):
    PRODUCT = "product"
    ADMIN = "admin"


class ToolLifecycleStatus(str, Enum):
    DRAFT = "draft"
    GENERATED = "generated"
    VALIDATED = "validated"
    APPROVED = "approved"
    ACTIVE = "active"
    FAILED = "failed"
    ARCHIVED = "archived"


class ToolLifecycleStageContract(BaseModel):
    code: ToolLifecycleStatus
    label: str
    description: str
    order: int = Field(ge=1)
    terminal: bool = False


TOOL_LIFECYCLE_STAGES: tuple[ToolLifecycleStageContract, ...] = (
    ToolLifecycleStageContract(
        code=ToolLifecycleStatus.DRAFT,
        label="Draft",
        description="Estado inicial de uma tool ainda em definicao.",
        order=1,
        terminal=False,
    ),
    ToolLifecycleStageContract(
        code=ToolLifecycleStatus.GENERATED,
        label="Generated",
        description="Implementacao gerada e pronta para analise tecnica.",
        order=2,
        terminal=False,
    ),
    ToolLifecycleStageContract(
        code=ToolLifecycleStatus.VALIDATED,
        label="Validated",
        description="Tool validada automaticamente com verificacoes basicas.",
        order=3,
        terminal=False,
    ),
    ToolLifecycleStageContract(
        code=ToolLifecycleStatus.APPROVED,
        label="Approved",
        description="Versao revisada e aprovada para publicacao controlada.",
        order=4,
        terminal=False,
    ),
    ToolLifecycleStageContract(
        code=ToolLifecycleStatus.ACTIVE,
        label="Active",
        description="Tool publicada e apta a abastecer o runtime de produto.",
        order=5,
        terminal=False,
    ),
    ToolLifecycleStageContract(
        code=ToolLifecycleStatus.FAILED,
        label="Failed",
        description="Falha registrada na geracao, validacao ou ativacao.",
        order=6,
        terminal=True,
    ),
    ToolLifecycleStageContract(
        code=ToolLifecycleStatus.ARCHIVED,
        label="Archived",
        description="Versao retirada de circulacao e mantida apenas para historico.",
        order=7,
        terminal=True,
    ),
)

TOOL_LIFECYCLE_STATUS_SEQUENCE: tuple[ToolLifecycleStatus, ...] = tuple(
    stage.code for stage in TOOL_LIFECYCLE_STAGES
)

_TOOL_LIFECYCLE_STAGE_BY_STATUS = {
    stage.code: stage for stage in TOOL_LIFECYCLE_STAGES
}


def get_tool_lifecycle_stage(
    status: ToolLifecycleStatus | str,
) -> ToolLifecycleStageContract:
    normalized_status = (
        status
        if isinstance(status, ToolLifecycleStatus)
        else ToolLifecycleStatus(str(status or "").strip().lower())
    )
    return _TOOL_LIFECYCLE_STAGE_BY_STATUS[normalized_status]


GENERATED_TOOLS_PACKAGE = "generated_tools"
GENERATED_TOOL_ENTRYPOINT = "run"
_GENERATED_TOOL_NAME_PATTERN = re.compile(r"^[a-z][a-z0-9_]{2,63}$")


def _normalize_generated_tool_name(tool_name: str) -> str:
    normalized = str(tool_name or "").strip().lower()
    if not _GENERATED_TOOL_NAME_PATTERN.match(normalized):
        raise ValueError("tool_name must use lowercase snake_case to build the generated module path.")
    return normalized


def build_generated_tool_module_name(tool_name: str) -> str:
    normalized = _normalize_generated_tool_name(tool_name)
    return f"{GENERATED_TOOLS_PACKAGE}.{normalized}"


def build_generated_tool_module_path(tool_name: str) -> str:
    normalized = _normalize_generated_tool_name(tool_name)
    return f"{GENERATED_TOOLS_PACKAGE}/{normalized}.py"


class ToolParameterType(str, Enum):
    STRING = "string"
    INTEGER = "integer"
    NUMBER = "number"
    BOOLEAN = "boolean"
    OBJECT = "object"
    ARRAY = "array"


class ToolParameterContract(BaseModel):
    name: str
    parameter_type: ToolParameterType
    description: str
    required: bool = True


class PublishedToolContract(BaseModel):
    tool_name: str
    display_name: str
    description: str
    version: int = Field(ge=1)
    status: ToolLifecycleStatus
    parameters: tuple[ToolParameterContract, ...] = ()
    implementation_module: str
    implementation_callable: str
    checksum: str | None = None
    published_at: datetime | None = None
    published_by: str | None = None


class ToolPublicationEnvelope(BaseModel):
    source_service: ServiceName = ServiceName.ADMIN
    target_service: ServiceName = ServiceName.PRODUCT
    publication_id: str
    published_tool: PublishedToolContract
    emitted_at: datetime