import uuid
from datetime import datetime
from typing import Any

from pydantic import BaseModel

from api.schemas.decision import DecisionRead
from api.schemas.domain import DomainSummary
from api.schemas.progress_event import ProgressEventRead
from api.schemas.task import TaskRead
from api.schemas.topic import TopicWithWorkstreams
from api.schemas.workstream import WorkstreamWithDeps


class TopicTotals(BaseModel):
    active: int = 0
    paused: int = 0
    archived: int = 0
    total: int = 0


class WorkstreamTotals(BaseModel):
    proposed: int = 0
    ready: int = 0
    active: int = 0
    blocked: int = 0
    backlog: int = 0
    finished: int = 0
    archived: int = 0
    total: int = 0


class TaskTotals(BaseModel):
    wait: int = 0
    todo: int = 0
    progress: int = 0
    done: int = 0
    cancel: int = 0
    total: int = 0


class DecisionTotals(BaseModel):
    open: int = 0
    resolved: int = 0
    escalated: int = 0
    superseded: int = 0
    total: int = 0


class Totals(BaseModel):
    topics: TopicTotals
    workstreams: WorkstreamTotals
    tasks: TaskTotals
    decisions: DecisionTotals


class NextStep(BaseModel):
    """A derived suggestion pointing to where work should happen next.

    Suggestions are never persisted — they are computed on demand from
    current hub state: recently resolved decisions, newly unblocked tasks,
    cleared dependencies.
    """
    type: str          # unblocked_task | resolved_decision | dependency_cleared
    domain: str | None = None
    workstream_id: uuid.UUID | None = None
    workstream_title: str | None = None
    workstream_slug: str | None = None
    task_id: uuid.UUID | None = None
    task_title: str | None = None
    message: str       # plain-language explanation


class StateSummary(BaseModel):
    generated_at: datetime
    totals: Totals
    topics: list[TopicWithWorkstreams]
    blocking_decisions: list[DecisionRead]
    waiting_tasks: list[TaskRead]
    blocked_tasks: list[TaskRead] = []
    recent_progress: list[ProgressEventRead]
    open_workstreams: list[WorkstreamWithDeps]
    next_steps: list[NextStep] = []
    domains: list[DomainSummary] = []
    contribution_counts: dict[str, int] = {}
    licence_risk_count: int = 0
    open_capability_requests: int = 0


class DashboardWorkplanRow(BaseModel):
    id: uuid.UUID
    title: str
    status: str
    domain: str = "unknown"
    repo_label: str = "unassigned"
    workplan_filename: str | None = None
    workplan_relative_path: str | None = None
    workplan_archived: bool = False
    health_labels: list[str] = []
    href: str
    done: int = 0
    progress: int = 0
    wait: int = 0
    todo: int = 0
    total: int = 0
    created_at: datetime
    updated_at: datetime


class DashboardSourceMeta(BaseModel):
    ok: bool = True
    stale: bool = False
    cache_age_seconds: float | None = None
    refresh_in_progress: bool = False
    error: str | None = None


class DashboardOverview(BaseModel):
    generated_at: datetime
    totals: Totals
    topics: list[TopicWithWorkstreams]
    blocking_decisions: list[DecisionRead]
    waiting_tasks: list[TaskRead]
    blocked_tasks: list[TaskRead] = []
    recent_progress: list[ProgressEventRead]
    next_steps: list[NextStep] = []
    contribution_counts: dict[str, int] = {}
    licence_risk_count: int = 0
    open_capability_requests: int = 0
    sbom_snapshot_count: int = 0
    sbom_package_total: int = 0
    registration_milestones: list[ProgressEventRead] = []
    workplan_rows: list[DashboardWorkplanRow] = []
    sources: dict[str, DashboardSourceMeta] = {}
    diagnostics: dict[str, Any] = {}