"""Pydantic schemas for the Human Voice Rewrite demo API.

Aligned with PRD v1.1 §31 (AI 输出结构建议):
- §31.1 First Analysis        -> AnalyzeRequest / AnalyzeResponse
- §31.2 Human Voice Diagnosis -> DiagnoseRequest / DiagnoseResponse
- §31.3 Recheck               -> RecheckRequest / RecheckResponse
Plus Progressive Help endpoints (PRD §22: Scaffold → Reference).
"""

from typing import Literal

from pydantic import BaseModel, Field


# ---------------------------------------------------------------- analyze
class AnalyzeRequest(BaseModel):
    prompt: str = ""
    word_limit: int | None = None
    paragraphs: list[str] = Field(min_length=1)
    constraints: list[str] = []  # advisor constraints already known before first pass


class ParagraphUnderstanding(BaseModel):
    id: str = ""
    original_text: str = ""
    natural_meaning_zh: str = ""  # 接近自然翻译的一段中文
    semantic_anchor: str = ""  # 必须保留的核心意思
    optional_content_opportunity: str = ""


class PromptAlignment(BaseModel):
    prompt_intent: str = ""
    current_alignment: str = ""
    optional_opportunity: str = ""


class AnalyzeResponse(BaseModel):
    essay_summary: str = ""
    prompt_alignment: PromptAlignment = PromptAlignment()
    paragraphs: list[ParagraphUnderstanding] = []


# ---------------------------------------------------------------- diagnose
class DiagnoseRequest(BaseModel):
    prompt: str = ""
    word_limit: int | None = None
    paragraphs: list[str] = Field(min_length=1)
    # 优先级（PRD §10.1）：顾问确认理解 > 顾问补充约束 > 模型初始理解
    confirmed_anchors: list[str] = []  # 与 paragraphs 等长；非空条目覆盖模型初判
    global_constraints: list[str] = []
    paragraph_constraints: dict[str, list[str]] = {}
    initial_analysis: AnalyzeResponse | None = None


PatternCategory = Literal["rhetoric", "repeat", "growth", "structure"]


class Pattern(BaseModel):
    pattern_id: str = ""
    name: str = ""
    category: str = ""  # rhetoric / repeat / growth / structure
    affected_paragraphs: list[str] = []
    evidence: list[str] = []  # 必须能在原文中找到的片段
    why_ai_like: str = ""
    human_impact: str = ""
    transformation_rule: str = ""


class Annotation(BaseModel):
    annotation_id: str = ""
    pattern_id: str = ""
    category: str = "rhetoric"
    kind_label: str = ""
    title: str = ""
    evidence: list[str] = []
    observation: str = ""
    rewrite_action: str = ""
    why_ai_like: str = ""


class ParagraphBrief(BaseModel):
    paragraph_id: str = ""
    confirmed_meaning: str = ""
    rewrite_goal: str = ""
    ai_focus: str = ""
    must_preserve: list[str] = []
    annotations: list[Annotation] = []
    context_hint: str = ""
    scaffold: str = ""
    reference_snippet: str = ""


class DiagnoseResponse(BaseModel):
    overall_diagnosis: str = ""
    patterns: list[Pattern] = []
    paragraph_briefs: list[ParagraphBrief] = []
    optional_suggestion: str = ""  # PRD §16 Optional 进阶建议（不阻塞）


# ---------------------------------------------------------------- recheck
class GlobalChecks(BaseModel):
    semantic_preservation: str = "pass"
    voice_consistency: str = "pass"
    pattern_reduction: str = "pass"
    new_pattern: str = "pass"
    coherence: str = "pass"
    reference_copying: str = "pass"
    word_limit: str = "pass"


class RevisionTarget(BaseModel):
    paragraph_id: str = "p1"
    blocking_issue: str = ""
    evidence: list[str] = []
    single_revision_goal: str = ""  # 单一明确返工目标


class RecheckResponse(BaseModel):
    status: Literal["pass", "revision_required"]
    checked_rewrite_version: str = ""
    global_checks: GlobalChecks
    revision_targets: list[RevisionTarget] = []


class RecheckRequest(BaseModel):
    prompt: str = ""
    word_limit: int | None = None
    original_paragraphs: list[str] = Field(min_length=1)
    confirmed_anchors: list[str] = []
    global_constraints: list[str] = []
    paragraph_constraints: dict[str, list[str]] = {}
    rewrite_paragraphs: list[str] = Field(min_length=1)
    diagnosis: DiagnoseResponse | None = None
    references_shown: list[str] = []  # 仅用户实际展开过的参考
    scaffolds_shown: list[str] = []  # 仅用户实际展开过的支架
    rewrite_version: str = ""
    previous_recheck: RecheckResponse | None = None
    previous_revision_target: RevisionTarget | None = None


# ---------------------------------------------------------------- progressive help
class ScaffoldRequest(BaseModel):
    paragraph_id: str
    original_text: str
    semantic_anchor: str
    rewrite_goal: str = ""
    global_constraints: list[str] = []
    paragraph_constraints: list[str] = []


class ScaffoldResponse(BaseModel):
    paragraph_id: str = ""
    scaffold: str = ""


class ReferenceRequest(BaseModel):
    paragraph_id: str
    original_text: str
    semantic_anchor: str
    rewrite_goal: str = ""
    primary_goal: str = ""  # 兼容旧字段名
    global_constraints: list[str] = []
    paragraph_constraints: list[str] = []


class ReferenceResponse(BaseModel):
    paragraph_id: str = ""
    starter: str = ""  # 1-2 句英文局部参考，非整段
    reference_snippet: str = ""


# ------------------------------------------------------- 体验优化：中文对照翻译
class TranslateRequest(BaseModel):
    text: str = Field(min_length=1)
    # 段落上下文（可选）：帮助模型稳定语气，不参与翻译输出
    paragraph_id: str = ""


class TranslateResponse(BaseModel):
    paragraph_id: str = ""
    translation: str = ""