from datetime import datetime
from typing import Literal

from pydantic import BaseModel, Field

# 법령 기반 10종 메타 태그 (PDF IV장)
LegalTag = Literal[
    "reproduction",            # 복제권
    "public_transmission",     # 공중송신권
    "distribution",            # 배포권
    "derivative_work",         # 2차적저작물작성권
    "publication",             # 공표권
    "attribution",             # 성명표시권
    "integrity",               # 동일성유지권
    "citation_missing",        # 인용 표시 누락
    "false_authorship",        # 자기 창작인 양 표시
    "substandard_derivative",  # 2차적저작물 미달 가공
]

TAG_LABEL_KO: dict[str, str] = {
    "reproduction": "복제권",
    "public_transmission": "공중송신권",
    "distribution": "배포권",
    "derivative_work": "2차적저작물작성권",
    "publication": "공표권",
    "attribution": "성명표시권",
    "integrity": "동일성유지권",
    "citation_missing": "인용 표시 누락",
    "false_authorship": "자기 창작인 양 표시",
    "substandard_derivative": "2차적저작물 미달 가공",
}

# 후방 호환용
InfringementType = Literal[
    "copy", "transform", "plot", "character", "background", "unknown",
]


class DocumentMetadata(BaseModel):
    title: str | None = None
    author: str | None = None
    genre: str | None = None
    publisher: str | None = None
    publication_year: int | None = None


class DetectOptions(BaseModel):
    return_evidence: bool = True
    threshold: float | None = Field(default=None, ge=0.0, le=1.0,
                                     description="None이면 서버 설정 사용. PDF VII-4 권장 0.85")
    top_k: int = Field(default=5, ge=1, le=50)
    autobiography_mode: bool | None = Field(
        default=None,
        description="None이면 서버 설정 사용. 명시하면 요청 단위 override.",
    )


class DetectRequest(BaseModel):
    doc_id: str
    text: str = Field(..., min_length=1)
    metadata: DocumentMetadata | None = None
    options: DetectOptions = Field(default_factory=DetectOptions)


class EvidenceSpan(BaseModel):
    start: int
    end: int
    matched: str


class InfringementTag(BaseModel):
    """법령 기반 침해 태그. 주(primary) 또는 보조(secondary) 역할."""
    tag: LegalTag
    role: Literal["primary", "secondary"]
    label_ko: str


class ScoreBreakdown(BaseModel):
    text_sim: float = Field(..., ge=0.0, le=1.0)
    lemma_sim: float = Field(..., ge=0.0, le=1.0)
    character_sim: float = Field(..., ge=0.0, le=1.0)
    motif_sim: float = Field(..., ge=0.0, le=1.0)
    lsh_jaccard: float | None = Field(default=None, ge=0.0, le=1.0)


class MatchResult(BaseModel):
    source_doc: str
    source_title: str | None = None
    similarity: float = Field(..., ge=0.0, le=1.0)
    tags: list[InfringementTag] = Field(default_factory=list)
    case_id: str | None = None
    case_title: str | None = None
    infringement_type: InfringementType = "unknown"
    evidence_spans: list[EvidenceSpan] = Field(default_factory=list)
    score_breakdown: ScoreBreakdown | None = None


class ExtractedElements(BaseModel):
    characters: list[str] = Field(default_factory=list)
    motifs: list[str] = Field(default_factory=list)
    genre: str | None = None
    keywords: list[str] = Field(default_factory=list)


class DetectResponse(BaseModel):
    doc_id: str
    is_infringement: bool
    confidence: float = Field(..., ge=0.0, le=1.0)
    extracted_elements: ExtractedElements
    matches: list[MatchResult]
    ccl_basis: str | None = None
    autobiography_mode: bool = False
    candidates_before_filter: int | None = None
    engine_version: str
    analyzed_at: datetime


class BatchItem(BaseModel):
    doc_id: str
    text: str
    metadata: DocumentMetadata | None = None


class BatchRequest(BaseModel):
    items: list[BatchItem] = Field(..., min_length=1, max_length=500)
    options: DetectOptions = Field(default_factory=DetectOptions)


class BatchCreatedResponse(BaseModel):
    job_id: str
    status: Literal["queued", "running", "completed", "failed"]
    total: int
    created_at: datetime


class BatchStatusResponse(BaseModel):
    job_id: str
    status: Literal["queued", "running", "completed", "failed"]
    total: int
    processed: int
    created_at: datetime
    finished_at: datetime | None = None
    results: list[DetectResponse] | None = None
    error: str | None = None


class HealthResponse(BaseModel):
    status: Literal["ok"]
    engine_version: str
    corpus_size: int
    taxonomy_version: str | None = None
    autobiography_mode: bool = False


class TaxonomyResponse(BaseModel):
    meta_tags_version: str
    cases_version: str
    meta_tags: list[dict]
    cases: list[dict]


class CorpusItem(BaseModel):
    doc_id: str
    title: str
    size_bytes: int = 0
    filename: str | None = None


class CorpusListResponse(BaseModel):
    total: int
    docs: list[CorpusItem]


class CorpusUploadRequest(BaseModel):
    doc_id: str | None = Field(default=None, description="비우면 자동 생성")
    title: str = Field(..., min_length=1)
    text: str = Field(..., min_length=1)


class CorpusUploadResponse(BaseModel):
    doc_id: str
    title: str
    size_bytes: int
    corpus_size_after: int
    rebuilt: bool