"""Delivery domain: CI/CD runs, releases and the demo runtime.

Framework-free, like every other domain package. The interesting rules live in
the *state* enums rather than in behaviour, because the behaviour is all about
ordering: a run is `queued → running → succeeded|failed|cancelled`, a step is
`pending → running → succeeded|failed|skipped`, and a release only becomes the
live demo one when the healthcheck has passed and the route has been switched.
"""

from __future__ import annotations

from dataclasses import dataclass, field
from datetime import datetime
from enum import StrEnum

from app.domain.base import new_id, utcnow


class RunTrigger(StrEnum):
    """Why a pipeline run exists.

    ``engine`` and ``poll`` are the two automatic sources; ``manual`` is an
    org admin pressing re-run. The distinction matters in the audit trail: "who
    started this build?" is the first question asked when a deploy goes wrong.
    """

    ENGINE = "engine"
    POLL = "poll"
    MANUAL = "manual"


class RunStatus(StrEnum):
    QUEUED = "queued"
    RUNNING = "running"
    SUCCEEDED = "succeeded"
    FAILED = "failed"
    CANCELLED = "cancelled"
    #: A newer run for the same project replaced this one before it started.
    SUPERSEDED = "superseded"


class StepStatus(StrEnum):
    PENDING = "pending"
    RUNNING = "running"
    SUCCEEDED = "succeeded"
    FAILED = "failed"
    #: The step had nothing to do (an empty build_command, say). Not a failure.
    SKIPPED = "skipped"


class RuntimeStatus(StrEnum):
    PROVISIONING = "provisioning"
    LIVE = "live"
    DEGRADED = "degraded"
    STOPPED = "stopped"


#: The eight steps of a run, in order. The names are the product contract: the
#: UI renders them verbatim and the tests assert on the exact sequence.
PIPELINE_STEPS: tuple[str, ...] = (
    "checkout",
    "setup",
    "build",
    "test",
    "package",
    "deploy_demo",
    "healthcheck",
    "route",
)

#: Steps that are skipped (not failed) when the app profile leaves the command
#: empty. `checkout`, `deploy_demo`, `healthcheck` and `route` always run.
OPTIONAL_STEPS: frozenset[str] = frozenset({"setup", "build", "test"})

#: Statuses that mean "this run is no longer interesting".
TERMINAL_RUN_STATUSES: frozenset[str] = frozenset(
    {
        RunStatus.SUCCEEDED.value,
        RunStatus.FAILED.value,
        RunStatus.CANCELLED.value,
        RunStatus.SUPERSEDED.value,
    }
)


@dataclass(slots=True, kw_only=True)
class PipelineRun:
    organization_id: str
    project_id: str
    branch: str = "dev"
    sha: str = ""
    trigger: str = RunTrigger.ENGINE.value
    status: str = RunStatus.QUEUED.value
    error_summary: str = ""
    id: str = field(default_factory=new_id)
    started_at: datetime | None = None
    finished_at: datetime | None = None
    created_at: datetime = field(default_factory=utcnow)

    @property
    def is_terminal(self) -> bool:
        return self.status in TERMINAL_RUN_STATUSES

    @property
    def is_active(self) -> bool:
        return self.status in {RunStatus.QUEUED.value, RunStatus.RUNNING.value}


@dataclass(slots=True, kw_only=True)
class PipelineStep:
    run_id: str
    index: int
    name: str
    status: str = StepStatus.PENDING.value
    exit_code: int | None = None
    log_tail: str = ""
    id: str = field(default_factory=new_id)
    started_at: datetime | None = None
    finished_at: datetime | None = None

    @property
    def duration_ms(self) -> int:
        if not self.started_at or not self.finished_at:
            return 0
        return max(0, int((self.finished_at - self.started_at).total_seconds() * 1000))


@dataclass(slots=True, kw_only=True)
class Release:
    organization_id: str
    project_id: str
    run_id: str
    sha: str
    artifact_path: str = ""
    is_demo_live: bool = False
    id: str = field(default_factory=new_id)
    created_at: datetime = field(default_factory=utcnow)


@dataclass(slots=True, kw_only=True)
class AppRuntime:
    """The one demo container a project has.

    ``host_port`` is the *live* port; a blue/green switch starts the replacement
    on a second port and only rewrites this row once the healthcheck passes.
    """

    project_id: str
    organization_id: str
    demo_host: str = ""
    host_port: int | None = None
    demo_container_id: str | None = None
    status: str = RuntimeStatus.PROVISIONING.value
    current_release_id: str | None = None
    updated_at: datetime = field(default_factory=utcnow)

    @property
    def demo_url(self) -> str:
        return f"https://{self.demo_host}" if self.demo_host else ""


class DeployStatus(StrEnum):
    QUEUED = "queued"
    RUNNING = "running"
    SUCCEEDED = "succeeded"
    FAILED = "failed"
    #: A deploy that undid an earlier one. Kept as its own row so "what was
    #: live when?" is answerable from the table alone.
    ROLLED_BACK = "rolled_back"


@dataclass(slots=True, kw_only=True)
class ProductionDeploy:
    organization_id: str
    project_id: str
    kind: str
    host: str = ""
    release_id: str | None = None
    target_id: str | None = None
    status: str = DeployStatus.QUEUED.value
    message: str = ""
    log_tail: str = ""
    rolled_back_from: str | None = None
    backup_path: str = ""
    id: str = field(default_factory=new_id)
    started_at: datetime | None = None
    finished_at: datetime | None = None
    created_at: datetime = field(default_factory=utcnow)