"""
資料模型定義 (Data Schemas)

本模組定義 TimeLine Designer 所有資料結構。
遵循 Pydantic BaseModel 進行嚴格型別驗證。
"""

from datetime import datetime
from typing import Optional, Literal, List
from pydantic import BaseModel, Field, field_validator
from enum import Enum


class EventType(str, Enum):
    """事件類型枚舉"""
    POINT = "point"      # 時間點事件
    RANGE = "range"      # 時間區間事件
    MILESTONE = "milestone"  # 里程碑


class Event(BaseModel):
    """
    時間軸事件模型

    對應 SDD.md - 2. 資料模型 - Event
    用於表示時間軸上的單一事件或時間區間。
    """
    id: str = Field(..., description="事件唯一識別碼")
    title: str = Field(..., min_length=1, max_length=200, description="事件標題")
    start: datetime = Field(..., description="開始時間")
    end: Optional[datetime] = Field(None, description="結束時間（可選）")
    group: Optional[str] = Field(None, description="事件群組/分類")
    description: Optional[str] = Field(None, max_length=1000, description="事件詳細描述")
    color: str = Field(default='#3B82F6', pattern=r'^#[0-9A-Fa-f]{6}$', description="事件顏色（HEX格式）")
    event_type: EventType = Field(EventType.POINT, description="事件類型")

    @field_validator('end')
    @classmethod
    def validate_end_after_start(cls, end, info):
        """驗證結束時間必須晚於開始時間"""
        if end and info.data.get('start') and end < info.data['start']:
            raise ValueError('結束時間必須晚於開始時間')
        return end

    class Config:
        json_schema_extra = {
            "example": {
                "id": "evt-001",
                "title": "專案啟動",
                "start": "2024-01-01T09:00:00",
                "end": "2024-01-01T17:00:00",
                "group": "Phase 1",
                "description": "專案正式啟動會議",
                "color": "#3B82F6",
                "event_type": "range"
            }
        }


class ThemeStyle(str, Enum):
    """主題樣式枚舉"""
    MODERN = "modern"
    CLASSIC = "classic"
    MINIMAL = "minimal"
    CORPORATE = "corporate"


class TimelineConfig(BaseModel):
    """
    時間軸配置模型

    對應 SDD.md - 2. 資料模型 - TimelineConfig
    控制時間軸的顯示方式與視覺樣式。
    """
    direction: Literal['horizontal', 'vertical'] = Field(
        'horizontal',
        description="時間軸方向"
    )
    theme: ThemeStyle = Field(
        ThemeStyle.MODERN,
        description="視覺主題"
    )
    show_grid: bool = Field(
        True,
        description="是否顯示網格線"
    )
    show_tooltip: bool = Field(
        True,
        description="是否顯示提示訊息"
    )
    enable_zoom: bool = Field(
        True,
        description="是否啟用縮放功能"
    )
    enable_drag: bool = Field(
        True,
        description="是否啟用拖曳功能"
    )

    class Config:
        json_schema_extra = {
            "example": {
                "direction": "horizontal",
                "theme": "modern",
                "show_grid": True,
                "show_tooltip": True,
                "enable_zoom": True,
                "enable_drag": True
            }
        }


class ExportFormat(str, Enum):
    """匯出格式枚舉"""
    PNG = "png"
    PDF = "pdf"
    SVG = "svg"


class ExportOptions(BaseModel):
    """
    匯出選項模型

    對應 SDD.md - 2. 資料模型 - ExportOptions
    控制時間軸圖檔的匯出格式與品質。
    """
    fmt: ExportFormat = Field(..., description="匯出格式")
    dpi: int = Field(
        300,
        ge=72,
        le=600,
        description="解析度（DPI）"
    )
    width: Optional[int] = Field(
        1920,
        ge=800,
        le=4096,
        description="圖片寬度（像素）"
    )
    height: Optional[int] = Field(
        1080,
        ge=600,
        le=4096,
        description="圖片高度（像素）"
    )
    transparent_background: bool = Field(
        False,
        description="是否使用透明背景"
    )

    class Config:
        json_schema_extra = {
            "example": {
                "fmt": "pdf",
                "dpi": 300,
                "width": 1920,
                "height": 1080,
                "transparent_background": False
            }
        }


class Theme(BaseModel):
    """
    主題定義模型

    用於 /themes API 回傳主題列表。
    """
    name: str = Field(..., description="主題名稱")
    style: ThemeStyle = Field(..., description="主題樣式識別碼")
    primary_color: str = Field(..., pattern=r'^#[0-9A-Fa-f]{6}$', description="主要顏色")
    background_color: str = Field(..., pattern=r'^#[0-9A-Fa-f]{6}$', description="背景顏色")
    text_color: str = Field(..., pattern=r'^#[0-9A-Fa-f]{6}$', description="文字顏色")

    class Config:
        json_schema_extra = {
            "example": {
                "name": "現代風格",
                "style": "modern",
                "primary_color": "#3B82F6",
                "background_color": "#FFFFFF",
                "text_color": "#1F2937"
            }
        }


class ImportResult(BaseModel):
    """
    匯入結果模型

    用於 /import API 回傳匯入結果。
    """
    success: bool = Field(..., description="是否成功")
    events: List[Event] = Field(default_factory=list, description="成功匯入的事件列表")
    errors: List[str] = Field(default_factory=list, description="錯誤訊息列表")
    total_rows: int = Field(0, description="總行數")
    imported_count: int = Field(0, description="成功匯入數量")

    class Config:
        json_schema_extra = {
            "example": {
                "success": True,
                "events": [],
                "errors": [],
                "total_rows": 100,
                "imported_count": 98
            }
        }


class RenderResult(BaseModel):
    """
    渲染結果模型

    用於 /render API 回傳 Plotly JSON 格式的時間軸資料。
    """
    success: bool = Field(..., description="是否成功")
    data: dict = Field(..., description="Plotly 圖表資料（JSON格式）")
    layout: dict = Field(..., description="Plotly 佈局設定")
    config: dict = Field(default_factory=dict, description="Plotly 配置")

    class Config:
        json_schema_extra = {
            "example": {
                "success": True,
                "data": {},
                "layout": {},
                "config": {}
            }
        }


class APIResponse(BaseModel):
    """
    通用 API 回應模型

    用於標準化 API 回應格式，提供一致的錯誤處理。
    """
    success: bool = Field(..., description="操作是否成功")
    message: str = Field("", description="回應訊息")
    data: Optional[dict] = Field(None, description="回應資料")
    error_code: Optional[str] = Field(None, description="錯誤代碼（如有）")

    class Config:
        json_schema_extra = {
            "example": {
                "success": True,
                "message": "操作成功",
                "data": None,
                "error_code": None
            }
        }