"""
Whitelisted Pydantic response schemas for the cloud API package.

All schemas are explicit allowlists — credentials_enc, tokens, and passwords
are deliberately absent. T-12-03: credential exclusion by design.

Phase 13 additions:
  - ConnectionHealthOut: typed health status response (D-12, CONN-03)
  - ReconnectOut: typed reconnect response (CONN-01..03)
  - ContentResultOut: typed open/preview/download response (D-02, D-18, T-13-14)
  - MutationResultOut: typed kind/reason mutation response (D-05..11)

Phase 14 additions:
  - CacheStatusOut: aggregate cache usage + settings response (T-14-02, T-14-08)
  - CacheSettingsUpdateRequest: PATCH body for updating analysis settings/cache limit
"""
from __future__ import annotations

from datetime import datetime
from typing import List, Optional

from pydantic import BaseModel, Field, field_validator


# ── Capability / item schemas ─────────────────────────────────────────────────

class CloudCapabilityOut(BaseModel):
    """Whitelisted capability descriptor.  reason/message only when not supported."""

    action: str
    state: str  # "supported" | "unsupported" | "temporarily_unavailable"
    reason: Optional[str] = None
    message: Optional[str] = None


class CloudItemOut(BaseModel):
    """Normalized cloud item metadata.  No credentials or byte content."""

    id: str           # DocuVault stable UUID
    provider_item_id: str
    name: str
    kind: str         # "file" | "folder"
    parent_ref: Optional[str] = None
    content_type: Optional[str] = None
    size: Optional[int] = None
    modified_at: Optional[datetime] = None
    etag: Optional[str] = None
    capabilities: dict[str, CloudCapabilityOut] = {}


# ── Freshness / folder state schemas ─────────────────────────────────────────

class FolderFreshnessOut(BaseModel):
    """Freshness and error state for a browsed folder."""

    refresh_state: str               # "fresh" | "refreshing" | "warning"
    last_refreshed_at: Optional[datetime] = None
    error_code: Optional[str] = None
    error_message: Optional[str] = None


# ── Browse response ───────────────────────────────────────────────────────────

class CloudBrowseResponse(BaseModel):
    """Owner-scoped connection-ID browse response.

    T-12-01: items are always scoped to the resolved connection which is owned
    by the requesting user.  credentials_enc is never included.
    """

    connection_id: str
    provider: str
    display_name: str
    parent_ref: Optional[str]
    items: List[CloudItemOut]
    capabilities: dict[str, CloudCapabilityOut]
    freshness: FolderFreshnessOut


# ── Connection schemas ────────────────────────────────────────────────────────

class ConnectionRenameRequest(BaseModel):
    """Validated PATCH body for renaming a connection display name.

    Only display_name is accepted — mass assignment prevention.
    """

    display_name: str = Field(..., max_length=255)

    @field_validator("display_name")
    @classmethod
    def must_be_nonblank(cls, v: str) -> str:
        stripped = v.strip()
        if not stripped:
            raise ValueError("display_name must not be blank")
        return stripped


# ── Phase 13 health / reconnect schemas ────────────────────────────────────────

class ConnectionHealthOut(BaseModel):
    """Typed connection health response.

    D-12: Explicit health status available without probing on every browse.
    CONN-03: Never exposes credentials_enc, tokens, or raw provider URLs.

    status: 'healthy' | 'degraded' | 'auth_failed' | 'offline'
    """

    status: str
    connection_id: str
    provider: str
    display_name: Optional[str] = None


class ReconnectOut(BaseModel):
    """Typed reconnect result.

    CONN-01: No new connection row created (reconnected patches in place).
    CONN-02: credentials_enc updated with re-encrypted token.
    CONN-03: No credentials, tokens, or provider URLs in response.
    D-14: Cached metadata preserved as stale.
    """

    status: str
    connection_id: str
    provider: str
    display_name: Optional[str] = None
    reconnected: bool = True


# ── Phase 13 content result schemas ───────────────────────────────────────────

class ContentResultOut(BaseModel):
    """Typed open/preview result body.

    D-02: Provider credentials and raw provider URLs must never appear in responses.
    D-18: Preview is binary-only; unsupported formats fall back to download fallback.
    T-13-14: Stable kind/reason codes let the frontend route without parsing provider payloads.

    kind: 'open' | 'preview' | 'download' | 'unsupported_preview'
    reason: discriminator code (e.g. 'binary_supported', 'unsupported_format', 'authorized')
    url: DocuVault-scoped authorized URL (never a raw provider URL)
    """

    kind: str
    reason: Optional[str] = None
    url: Optional[str] = None
    content_type: Optional[str] = None


# ── Phase 13 mutation result schemas ──────────────────────────────────────────

class MutationResultOut(BaseModel):
    """Typed mutation result body used by rename, move, delete, and create-folder.

    T-13-14: Stable kind/reason codes let the frontend route without parsing
    raw provider error payloads.

    kind: 'renamed' | 'moved' | 'deleted' | 'folder' | 'conflict' | 'stale' |
          'offline' | 'reauth_required' | 'invalid_destination' | 'unsupported_operation'
    reason: discriminator detail (e.g. 'trashed', 'permanent', 'name_collision',
            'item_changed', 'provider_unreachable', 'token_expired',
            'self_destination', 'cross_connection', 'provider_unsupported')
    """

    kind: str
    reason: Optional[str] = None
    name: Optional[str] = None
    provider_item_id: Optional[str] = None
    parent_ref: Optional[str] = None


# ── Phase 13 mutation request schemas ─────────────────────────────────────────

class CreateFolderRequest(BaseModel):
    """Request body for POST /connections/{id}/folders."""
    parent_ref: Optional[str] = None
    name: str = Field(..., max_length=255)

    @field_validator("name")
    @classmethod
    def must_be_nonblank(cls, v: str) -> str:
        stripped = v.strip()
        if not stripped:
            raise ValueError("name must not be blank")
        return stripped


class RenameItemRequest(BaseModel):
    """Request body for PATCH /connections/{id}/items/{item_id}/rename."""
    new_name: str = Field(..., max_length=255)
    etag: Optional[str] = None

    @field_validator("new_name")
    @classmethod
    def must_be_nonblank(cls, v: str) -> str:
        stripped = v.strip()
        if not stripped:
            raise ValueError("new_name must not be blank")
        return stripped


class MoveItemRequest(BaseModel):
    """Request body for POST /connections/{id}/items/{item_id}/move."""
    destination_parent_ref: str
    destination_connection_id: Optional[str] = None
    etag: Optional[str] = None


# ── Phase 14 cache schemas ─────────────────────────────────────────────────────

class CacheStatusOut(BaseModel):
    """Aggregate cache usage and user analysis settings.

    T-14-02: object_key, credentials_enc, and raw provider URLs are absent by
    design.  This schema is a strict allowlist — no internal MinIO keys or
    credentials can leak through it.

    entry_count:              Number of active (non-evicted) cache entries.
    total_bytes:              Sum of size_bytes across active entries.
    cache_limit_bytes:        User's preferred cache byte ceiling.
    tier_cap_bytes:           Maximum allowed cache limit for this tier.
    analysis_progress_detail: "simple" | "detailed" — default "simple".
    analysis_failure_behavior:"pause_batch" | "continue_item" — default "pause_batch".
    """

    entry_count: int = 0
    total_bytes: int = 0
    cache_limit_bytes: int
    tier_cap_bytes: int
    analysis_progress_detail: str
    analysis_failure_behavior: str


class CacheSettingsUpdateRequest(BaseModel):
    """PATCH body for updating analysis preferences and cache limit.

    Only provided (non-None) fields are applied.  Enum validation and bounds
    checking are performed in the service layer.

    Mass-assignment prevention: only the three fields below are accepted.
    """

    analysis_progress_detail: Optional[str] = Field(
        default=None,
        description="Progress label verbosity: 'simple' or 'detailed'",
    )
    analysis_failure_behavior: Optional[str] = Field(
        default=None,
        description="Batch failure mode: 'pause_batch' or 'continue_item'",
    )
    cloud_cache_limit_bytes: Optional[int] = Field(
        default=None,
        ge=1,
        description="Preferred byte ceiling for the local byte cache",
    )


# ── Phase 14 analysis request schemas ─────────────────────────────────────────

class AnalysisEstimateRequest(BaseModel):
    """Request body for POST /analysis/connections/{id}/estimate.

    scope: "file" | "selection" | "folder" | "connection"
    provider_item_ids: Required for file/selection/folder scope.  Omitted for connection scope.
    recursive: Expand folder subtree recursively (folder scope only; connection always recursive).
    """

    scope: str = Field(..., description="file | selection | folder | connection")
    provider_item_ids: Optional[List[str]] = Field(
        default=None,
        description="Provider item IDs for file/selection/folder scope",
    )
    recursive: bool = Field(
        default=False,
        description="Expand folder children recursively (folder scope)",
    )


class AnalysisEnqueueRequest(BaseModel):
    """Request body for POST /analysis/connections/{id}/jobs.

    scope: "file" | "selection" | "folder" | "connection"
    provider_item_ids: Required for file/selection/folder scope.
    recursive: Expand folder subtree recursively.
    failure_behavior: "pause_batch" (default) | "continue_item" (D-11).
    """

    scope: str = Field(..., description="file | selection | folder | connection")
    provider_item_ids: Optional[List[str]] = Field(default=None)
    recursive: bool = Field(default=False)
    failure_behavior: str = Field(
        default="pause_batch",
        description="pause_batch | continue_item",
    )


# ── Phase 14 analysis response schemas ────────────────────────────────────────

class AnalysisEstimateOut(BaseModel):
    """Estimate response — no credentials, bytes, or object_key (T-14-02).

    supported_count:      Files that can be analysed.
    unsupported_count:    Items that cannot be analysed (unsupported type, folder).
    total_provider_bytes: Sum of provider_size across supported items.
    recursive:            Whether the estimate was recursive.
    is_partial:           True when metadata expansion was incomplete.
    scope_kind:           Echo of the requested scope.
    """

    supported_count: int = 0
    unsupported_count: int = 0
    total_provider_bytes: int = 0
    recursive: bool = False
    is_partial: bool = False
    scope_kind: str


class AnalysisJobOut(BaseModel):
    """Job status response — no credentials or object_key (T-14-02).

    Exposes both simple and detailed aggregate counts.  Caller requests detail
    via ?detail=true query parameter.

    Simple (default):  waiting_count, working_count, done_count,
                       skipped_count, failed_count, total_count.
    Detailed:          queued_count, downloading_count, extracting_count,
                       classifying_count, indexed_count, already_current_count,
                       cancelled_count, failed_count, unsupported_count.
    """

    job_id: str
    connection_id: str
    scope_kind: str
    status: str
    failure_behavior: str
    recursive: bool = False
    total_count: int = 0

    # Simple labels (always present)
    waiting_count: int = 0
    working_count: int = 0
    done_count: int = 0
    skipped_count: int = 0
    failed_count: int = 0

    # Detailed labels (always present — 0 when detail=false, per-stage values when detail=true)
    queued_count: int = 0
    downloading_count: int = 0
    extracting_count: int = 0
    classifying_count: int = 0
    indexed_count: int = 0
    already_current_count: int = 0
    cancelled_count: int = 0
    unsupported_count: int = 0

    created_at: Optional[datetime] = None
    started_at: Optional[datetime] = None
    finished_at: Optional[datetime] = None


class AnalysisEnqueueOut(BaseModel):
    """Enqueue response — returns a stable job_id for status polling (ANALYZE-01).

    No credentials or object_key in response (T-14-02).
    """

    job_id: str
    status: str
    total_count: int = 0
    queued_count: int = 0
    already_current_count: int = 0
    unsupported_count: int = 0


class AnalysisJobItemOut(BaseModel):
    """Per-item job status — no credentials, object_key, or raw provider data (T-14-02)."""

    id: str
    cloud_item_id: str
    provider_item_id: str
    status: str
    error_code: Optional[str] = None
    error_message: Optional[str] = None
    retry_count: int = 0
    created_at: Optional[datetime] = None
    finished_at: Optional[datetime] = None


class AnalysisControlOut(BaseModel):
    """Generic control result for cancel/skip/retry operations."""

    kind: str        # "cancelled" | "skipped" | "retried"
    reason: Optional[str] = None
    job_id: Optional[str] = None
    item_id: Optional[str] = None