"""Pydantic schemas for the Chrysopedia API.

Read-only schemas for list/detail endpoints and input schemas for creation.
Each schema mirrors the corresponding SQLAlchemy model in models.py.
"""

from __future__ import annotations

import uuid
from datetime import datetime

from pydantic import BaseModel, ConfigDict, Field


# ── Health ───────────────────────────────────────────────────────────────────

class HealthResponse(BaseModel):
    status: str = "ok"
    service: str = "chrysopedia-api"
    version: str = "0.1.0"
    database: str = "unknown"


# ── Creator ──────────────────────────────────────────────────────────────────

class CreatorBase(BaseModel):
    name: str
    slug: str
    genres: list[str] | None = None
    folder_name: str

class CreatorCreate(CreatorBase):
    pass

class CreatorRead(CreatorBase):
    model_config = ConfigDict(from_attributes=True)

    id: uuid.UUID
    view_count: int = 0
    created_at: datetime
    updated_at: datetime


class CreatorDetail(CreatorRead):
    """Creator with nested video count."""
    video_count: int = 0


# ── SourceVideo ──────────────────────────────────────────────────────────────

class SourceVideoBase(BaseModel):
    filename: str
    file_path: str
    duration_seconds: int | None = None
    content_type: str
    transcript_path: str | None = None

class SourceVideoCreate(SourceVideoBase):
    creator_id: uuid.UUID

class SourceVideoRead(SourceVideoBase):
    model_config = ConfigDict(from_attributes=True)

    id: uuid.UUID
    creator_id: uuid.UUID
    processing_status: str = "pending"
    created_at: datetime
    updated_at: datetime


# ── TranscriptSegment ────────────────────────────────────────────────────────

class TranscriptSegmentBase(BaseModel):
    start_time: float
    end_time: float
    text: str
    segment_index: int
    topic_label: str | None = None

class TranscriptSegmentCreate(TranscriptSegmentBase):
    source_video_id: uuid.UUID

class TranscriptSegmentRead(TranscriptSegmentBase):
    model_config = ConfigDict(from_attributes=True)

    id: uuid.UUID
    source_video_id: uuid.UUID


# ── KeyMoment ────────────────────────────────────────────────────────────────

class KeyMomentBase(BaseModel):
    title: str
    summary: str
    start_time: float
    end_time: float
    content_type: str
    plugins: list[str] | None = None
    raw_transcript: str | None = None

class KeyMomentCreate(KeyMomentBase):
    source_video_id: uuid.UUID
    technique_page_id: uuid.UUID | None = None

class KeyMomentRead(KeyMomentBase):
    model_config = ConfigDict(from_attributes=True)

    id: uuid.UUID
    source_video_id: uuid.UUID
    technique_page_id: uuid.UUID | None = None
    review_status: str = "pending"
    created_at: datetime
    updated_at: datetime


# ── TechniquePage ────────────────────────────────────────────────────────────

class TechniquePageBase(BaseModel):
    title: str
    slug: str
    topic_category: str
    topic_tags: list[str] | None = None
    summary: str | None = None
    body_sections: dict | None = None
    signal_chains: list | None = None
    plugins: list[str] | None = None

class TechniquePageCreate(TechniquePageBase):
    creator_id: uuid.UUID
    source_quality: str | None = None

class TechniquePageRead(TechniquePageBase):
    model_config = ConfigDict(from_attributes=True)

    id: uuid.UUID
    creator_id: uuid.UUID
    source_quality: str | None = None
    view_count: int = 0
    review_status: str = "draft"
    created_at: datetime
    updated_at: datetime


# ── RelatedTechniqueLink ─────────────────────────────────────────────────────

class RelatedTechniqueLinkBase(BaseModel):
    source_page_id: uuid.UUID
    target_page_id: uuid.UUID
    relationship: str

class RelatedTechniqueLinkCreate(RelatedTechniqueLinkBase):
    pass

class RelatedTechniqueLinkRead(RelatedTechniqueLinkBase):
    model_config = ConfigDict(from_attributes=True)

    id: uuid.UUID


# ── Tag ──────────────────────────────────────────────────────────────────────

class TagBase(BaseModel):
    name: str
    category: str
    aliases: list[str] | None = None

class TagCreate(TagBase):
    pass

class TagRead(TagBase):
    model_config = ConfigDict(from_attributes=True)

    id: uuid.UUID


# ── Transcript Ingestion ─────────────────────────────────────────────────────

class TranscriptIngestResponse(BaseModel):
    """Response returned after successfully ingesting a transcript."""
    video_id: uuid.UUID
    creator_id: uuid.UUID
    creator_name: str
    filename: str
    segments_stored: int
    processing_status: str
    is_reupload: bool


# ── Pagination wrapper ───────────────────────────────────────────────────────

class PaginatedResponse(BaseModel):
    """Generic paginated list response."""
    items: list = Field(default_factory=list)
    total: int = 0
    offset: int = 0
    limit: int = 50


# ── Review Queue ─────────────────────────────────────────────────────────────

class ReviewQueueItem(KeyMomentRead):
    """Key moment enriched with source video and creator info for review UI."""
    video_filename: str
    creator_name: str


class ReviewQueueResponse(BaseModel):
    """Paginated response for the review queue."""
    items: list[ReviewQueueItem] = Field(default_factory=list)
    total: int = 0
    offset: int = 0
    limit: int = 50


class ReviewStatsResponse(BaseModel):
    """Counts of key moments grouped by review status."""
    pending: int = 0
    approved: int = 0
    edited: int = 0
    rejected: int = 0


class MomentEditRequest(BaseModel):
    """Editable fields for a key moment."""
    title: str | None = None
    summary: str | None = None
    start_time: float | None = None
    end_time: float | None = None
    content_type: str | None = None
    plugins: list[str] | None = None


class MomentSplitRequest(BaseModel):
    """Request to split a moment at a given timestamp."""
    split_time: float


class MomentMergeRequest(BaseModel):
    """Request to merge two moments."""
    target_moment_id: uuid.UUID


class ReviewModeResponse(BaseModel):
    """Current review mode state."""
    review_mode: bool


class ReviewModeUpdate(BaseModel):
    """Request to update the review mode."""
    review_mode: bool