"""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 typing import Literal

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
    content_hash: str | None = None
    processing_status: str = "not_started"
    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
    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: list | dict | None = None
    body_sections_format: str = "v1"
    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
    creator_name: str = ""
    creator_slug: str = ""
    source_quality: str | None = None
    view_count: int = 0
    key_moment_count: int = 0
    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
    content_hash: str


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

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


# ── Search ───────────────────────────────────────────────────────────────────

class SearchResultItem(BaseModel):
    """A single search result."""
    title: str
    slug: str = ""
    technique_page_slug: str = ""
    type: str = ""
    score: float = 0.0
    summary: str = ""
    creator_name: str = ""
    creator_slug: str = ""
    topic_category: str = ""
    topic_tags: list[str] = Field(default_factory=list)
    match_context: str = ""


class SearchResponse(BaseModel):
    """Top-level search response with metadata."""
    items: list[SearchResultItem] = Field(default_factory=list)
    partial_matches: list[SearchResultItem] = Field(default_factory=list)
    total: int = 0
    query: str = ""
    fallback_used: bool = False


class SuggestionItem(BaseModel):
    """A single autocomplete suggestion."""
    text: str
    type: Literal["topic", "technique", "creator"]


class SuggestionsResponse(BaseModel):
    """Popular search suggestions for autocomplete."""
    suggestions: list[SuggestionItem] = Field(default_factory=list)


# ── Technique Page Detail ────────────────────────────────────────────────────

class KeyMomentSummary(BaseModel):
    """Lightweight key moment for technique page detail."""
    model_config = ConfigDict(from_attributes=True)

    id: uuid.UUID
    title: str
    summary: str
    start_time: float
    end_time: float
    content_type: str
    plugins: list[str] | None = None
    source_video_id: uuid.UUID | None = None
    video_filename: str = ""


class RelatedLinkItem(BaseModel):
    """A related technique link with target info."""
    model_config = ConfigDict(from_attributes=True)

    target_title: str = ""
    target_slug: str = ""
    relationship: str = ""
    creator_name: str = ""
    topic_category: str = ""
    reason: str = ""


class CreatorInfo(BaseModel):
    """Minimal creator info embedded in technique detail."""
    model_config = ConfigDict(from_attributes=True)

    name: str
    slug: str
    genres: list[str] | None = None


class SourceVideoSummary(BaseModel):
    """Lightweight source video info for technique page detail."""
    model_config = ConfigDict(from_attributes=True)

    id: uuid.UUID
    filename: str
    content_type: str
    added_at: datetime | None = None


class TechniquePageDetail(TechniquePageRead):
    """Technique page with nested key moments, creator, and related links."""
    key_moments: list[KeyMomentSummary] = Field(default_factory=list)
    creator_info: CreatorInfo | None = None
    related_links: list[RelatedLinkItem] = Field(default_factory=list)
    version_count: int = 0
    source_videos: list[SourceVideoSummary] = Field(default_factory=list)


# ── Technique Page Versions ──────────────────────────────────────────────────

class TechniquePageVersionSummary(BaseModel):
    """Lightweight version entry for list responses."""
    model_config = ConfigDict(from_attributes=True)

    version_number: int
    created_at: datetime
    pipeline_metadata: dict | None = None


class TechniquePageVersionDetail(BaseModel):
    """Full version snapshot for detail responses."""
    model_config = ConfigDict(from_attributes=True)

    version_number: int
    content_snapshot: dict
    pipeline_metadata: dict | None = None
    created_at: datetime


class TechniquePageVersionListResponse(BaseModel):
    """Response for version list endpoint."""
    items: list[TechniquePageVersionSummary] = Field(default_factory=list)
    total: int = 0


# ── Topics ───────────────────────────────────────────────────────────────────

class TopicSubTopic(BaseModel):
    """A sub-topic with aggregated counts."""
    name: str
    technique_count: int = 0
    creator_count: int = 0


class TopicCategory(BaseModel):
    """A top-level topic category with sub-topics."""
    name: str
    description: str = ""
    sub_topics: list[TopicSubTopic] = Field(default_factory=list)


# ── Creator Browse ───────────────────────────────────────────────────────────

class CreatorBrowseItem(CreatorRead):
    """Creator with technique and video counts for browse pages."""
    technique_count: int = 0
    video_count: int = 0


# ── Content Reports ──────────────────────────────────────────────────────────

class ContentReportCreate(BaseModel):
    """Public submission: report a content issue."""
    content_type: str = Field(
        ..., description="Entity type: technique_page, key_moment, creator, general"
    )
    content_id: uuid.UUID | None = Field(
        None, description="ID of the reported entity (null for general reports)"
    )
    content_title: str | None = Field(
        None, description="Title of the reported content (for display context)"
    )
    report_type: str = Field(
        ..., description="inaccurate, missing_info, wrong_attribution, formatting, other"
    )
    description: str = Field(
        ..., min_length=10, max_length=2000,
        description="Description of the issue"
    )
    page_url: str | None = Field(
        None, description="URL the user was on when reporting"
    )


class ContentReportRead(BaseModel):
    """Full report for admin views."""
    model_config = ConfigDict(from_attributes=True)

    id: uuid.UUID
    content_type: str
    content_id: uuid.UUID | None = None
    content_title: str | None = None
    report_type: str
    description: str
    status: str = "open"
    admin_notes: str | None = None
    page_url: str | None = None
    created_at: datetime
    resolved_at: datetime | None = None


class ContentReportUpdate(BaseModel):
    """Admin update: change status and/or add notes."""
    status: str | None = Field(
        None, description="open, acknowledged, resolved, dismissed"
    )
    admin_notes: str | None = Field(
        None, max_length=2000, description="Admin notes about resolution"
    )


class ContentReportListResponse(BaseModel):
    """Paginated list of content reports."""
    items: list[ContentReportRead] = Field(default_factory=list)
    total: int = 0
    offset: int = 0
    limit: int = 50


# ── Pipeline Debug Mode ─────────────────────────────────────────────────────

class DebugModeResponse(BaseModel):
    """Current debug mode status."""
    debug_mode: bool


class DebugModeUpdate(BaseModel):
    """Toggle debug mode on/off."""
    debug_mode: bool


class TokenStageSummary(BaseModel):
    """Per-stage token usage aggregation."""
    stage: str
    call_count: int
    total_prompt_tokens: int
    total_completion_tokens: int
    total_tokens: int


class TokenSummaryResponse(BaseModel):
    """Token usage summary for a video, broken down by stage."""
    video_id: str
    stages: list[TokenStageSummary] = Field(default_factory=list)
    grand_total_tokens: int