"""Pydantic request/response schemas (API contract)."""
from __future__ import annotations

import uuid
from datetime import datetime

from pydantic import BaseModel, Field, field_validator


class HealthResponse(BaseModel):
    status: str
    db: str
    version: str
    environment: str


class SuggestionList(BaseModel):
    suggestions: list[str]


class ChatRequest(BaseModel):
    message: str = Field(min_length=1, max_length=4000)


class LoginRequest(BaseModel):
    """``POST /api/login`` body (phase 16): the single admin's password.

    An empty or wrong password is a 401 with one generic detail — never a
    422 that would hint at input-shape differences.
    """

    password: str = ""


class WhoamiResponse(BaseModel):
    """``GET /api/whoami`` (phase 16) — drives all UI gating."""

    authenticated: bool
    role: str  # "admin" | "anonymous"


class SourceRef(BaseModel):
    source: str
    path: str
    title: str


class ChatThinkingEvent(BaseModel):
    """SSE thinking event: one chunk of the model's reasoning (phase 17).

    PLAN §4 extension (A15, owner permission 2026-08-23): frames of the
    shape ``{type: "thinking", text: str}`` stream ahead of the
    ``delta`` frames in practice (the model reasons before it answers). The
    client renders them in a collapsible "Thinking" block; the ``done``
    event shape is unchanged and thinking text never travels on it.
    Sibling of :class:`ChatErrorEvent`.
    """

    type: str = "thinking"
    text: str


class ChatDoneEvent(BaseModel):
    """Final SSE event of a chat turn: metadata for the finished answer."""

    type: str = "done"
    deflected: bool
    sources: list[SourceRef]
    suggestions: list[str] = []


class ChatErrorEvent(BaseModel):
    """SSE error event: a turn that cannot complete (PLAN §4).

    The client's loading-feedback state machine (phase 06) keys off this
    exact shape — ``{type: "error", detail: str}`` — to flip to the error
    state and re-enable the send button.
    """

    type: str = "error"
    detail: str


class DocSummary(BaseModel):
    """One indexed document as shown on the Sources page / API."""

    id: str
    source: str
    path: str
    title: str
    chunks: int
    indexed_at: str


class DocList(BaseModel):
    """Response of ``GET /api/docs`` (empty list → designed empty state)."""

    documents: list[DocSummary]


class DocContent(BaseModel):
    """One indexed document's full content (feeds the viewer page, phase 10)."""

    source: str
    path: str
    title: str
    format: str
    #: Lite-model summary (phase 30) — non-markdown A9 docs only; None for
    #: markdown documents, pre-phase-30 rows, and the fail-soft path where
    #: summary generation failed but the document was still indexed.
    summary: str | None = None
    content: str
    indexed_at: str
    chunks: int


class SteeringNoteIn(BaseModel):
    """``POST /api/steering`` body: one tuning instruction (phase 15).

    The note is trimmed *before* the length constraints run, so a
    whitespace-only body is a 422 and a 2000-char note with surrounding
    spaces still passes.
    """

    note: str = Field(min_length=1, max_length=2000)

    @field_validator("note", mode="before")
    @classmethod
    def _trim_note(cls, v: object) -> object:
        return v.strip() if isinstance(v, str) else v


class SteeringNoteUpdate(BaseModel):
    """``PUT /api/steering/{id}`` body: a new tuning instruction (phase 27).

    Mirrors :class:`SteeringNoteIn` — the note is trimmed *before* the
    length constraints run, so an empty/whitespace body is a 422 and a
    full replacement that is ≤2000 chars after the trim still passes.
    """

    note: str = Field(min_length=1, max_length=2000)

    @field_validator("note", mode="before")
    @classmethod
    def _trim_note(cls, v: object) -> object:
        return v.strip() if isinstance(v, str) else v


class SteeringNote(BaseModel):
    """One stored steering note (API shape — ISO-8601 ``created_at``)."""

    id: uuid.UUID
    note: str
    created_at: datetime


class SteeringNoteList(BaseModel):
    """``GET /api/steering`` response: all notes, newest first."""

    notes: list[SteeringNote]


class GitSourceIn(BaseModel):
    """``POST /api/git-sources`` body: one repo URL (phase 35, task 02).

    Mirrors :class:`SteeringNoteIn` — the URL is trimmed *before* the
    length constraints run, so a whitespace-only body is a 422 and a URL
    with surrounding spaces is stored clean. Shape validation
    (``https://``, ``ssh://``, ``git@``) happens in the API layer so the
    422 detail can be one generic string that never echoes the input.
    """

    url: str = Field(min_length=1, max_length=500)

    @field_validator("url", mode="before")
    @classmethod
    def _trim_url(cls, v: object) -> object:
        return v.strip() if isinstance(v, str) else v


class GitSourceOut(BaseModel):
    """One git source as returned by the API (phase 35, task 02).

    ``id`` / ``added_at`` are nullable: env-fallback rows (table empty →
    the list comes from ``BOR_GIT_SOURCES``) carry neither, only a URL.
    """

    id: uuid.UUID | None
    url: str
    added_at: datetime | None


class GitSourceList(BaseModel):
    """``GET /api/git-sources`` response (phase 35, task 02).

    ``from_env`` is True only when the ``git_sources`` table is empty and
    the list comes from ``BOR_GIT_SOURCES`` (the phase's locked fallback);
    once the table has rows the env var is ignored and ``from_env`` is
    False — the UI is the source of truth.
    """

    sources: list[GitSourceOut]
    from_env: bool