"""
Data models for US Code git repository system.
Provides normalized, validated structures for all legislative data.
"""

from datetime import datetime, date
from typing import List, Optional, Dict, Any, Literal
from pathlib import Path
from pydantic import BaseModel, Field, field_validator, HttpUrl
from enum import Enum


class CongressionalChamber(str, Enum):
    """Congressional chambers"""
    HOUSE = "House"
    SENATE = "Senate"


class PoliticalParty(str, Enum):
    """Political parties (expandable)"""
    DEMOCRATIC = "D"
    REPUBLICAN = "R" 
    INDEPENDENT = "I"
    LIBERTARIAN = "L"
    GREEN = "G"
    UNKNOWN = "Unknown"


class BillType(str, Enum):
    """Types of congressional bills"""
    HOUSE_BILL = "HR"
    SENATE_BILL = "S"
    HOUSE_JOINT_RESOLUTION = "HJR"
    SENATE_JOINT_RESOLUTION = "SJR"
    HOUSE_CONCURRENT_RESOLUTION = "HCR"
    SENATE_CONCURRENT_RESOLUTION = "SCR"
    HOUSE_RESOLUTION = "HRES"
    SENATE_RESOLUTION = "SRES"


class LegislativeAction(BaseModel):
    """A single legislative action on a bill"""
    date: date
    action_code: Optional[str] = None
    text: str
    chamber: Optional[CongressionalChamber] = None
    
    class Config:
        use_enum_values = True


class Sponsor(BaseModel):
    """Congressional member who sponsors legislation"""
    bioguide_id: Optional[str] = Field(None, description="Biographical Directory ID")
    title: str = Field(..., description="Rep. or Sen.")
    first_name: str
    last_name: str
    full_name: str
    party: PoliticalParty
    state: str = Field(..., min_length=2, max_length=2, description="Two-letter state code")
    district: Optional[int] = Field(None, description="House district number (if applicable)")
    chamber: CongressionalChamber
    
    # Computed fields
    @property
    def email(self) -> str:
        """Generate congressional email address"""
        first = self.first_name.lower().replace(" ", "")
        last = self.last_name.lower().replace(" ", "")
        domain = "house.gov" if self.chamber == CongressionalChamber.HOUSE else "senate.gov"
        return f"{first}.{last}@{domain}"
    
    @property
    def formal_name(self) -> str:
        """Full formal name with title and party"""
        return f"{self.title} {self.full_name} ({self.party}-{self.state})"
    
    class Config:
        use_enum_values = True


class Bill(BaseModel):
    """Congressional bill that may become a public law"""
    congress: int = Field(..., ge=1, description="Congressional session number")
    bill_type: BillType
    number: int = Field(..., ge=1, description="Bill number within type/congress")
    title: Optional[str] = None
    short_title: Optional[str] = None
    
    # Sponsorship
    primary_sponsor: Optional["Sponsor"] = None
    cosponsors: List["Sponsor"] = Field(default_factory=lambda: [])
    
    # Legislative process
    introduced_date: Optional[date] = None
    actions: List["LegislativeAction"] = Field(default_factory=lambda: [])
    
    # External IDs
    congress_gov_url: Optional[HttpUrl] = None
    
    @property
    def bill_id(self) -> str:
        """Unique bill identifier"""
        return f"{self.bill_type.value}{self.number}"
    
    @property
    def full_id(self) -> str:
        """Full bill identifier with congress"""
        return f"{self.congress}-{self.bill_id}"
    
    class Config:
        use_enum_values = True


class PublicLaw(BaseModel):
    """A bill that has been enacted into public law"""
    congress: int = Field(..., ge=1, description="Congressional session number")
    law_number: int = Field(..., ge=1, description="Public law number within congress")
    
    # Enactment details
    enacted_date: date
    signed_date: Optional[date] = None
    
    # Source bill (if known)
    source_bill: Optional[Bill] = None
    
    # US Code impact
    affected_titles: List[int] = Field(default_factory=lambda: [], description="US Code titles affected")
    
    # House release point data
    release_path: str = Field(..., description="House download path (e.g., '119/26not21')")
    
    # Metadata
    title: Optional[str] = None
    description: Optional[str] = None
    
    @property
    def public_law_id(self) -> str:
        """Standard public law identifier"""
        return f"PL {self.congress}-{self.law_number}"
    
    @property
    def formal_citation(self) -> str:
        """Formal legal citation"""
        return f"Public Law {self.congress}-{self.law_number:03d}"
    
    @field_validator('affected_titles')
    @classmethod
    def validate_titles(cls, v: List[int]) -> List[int]:
        """Validate US Code title numbers"""
        for title in v:
            if not (1 <= title <= 54):
                raise ValueError(f"Invalid US Code title: {title}")
        return sorted(v)
    
    class Config:
        use_enum_values = True


class USCodeRelease(BaseModel):
    """A specific release of the US Code from House sources"""
    public_law: PublicLaw
    
    # Download metadata
    download_url: str
    download_date: Optional[datetime] = None
    file_size: Optional[int] = None
    file_hash: Optional[str] = Field(None, description="SHA-256 hash")
    
    # Extraction metadata
    extracted_date: Optional[datetime] = None
    extraction_path: Optional[Path] = None
    file_count: Optional[int] = None
    
    # Git metadata
    git_commit_hash: Optional[str] = None
    git_tag: Optional[str] = None
    
    @property
    def release_filename(self) -> str:
        """Standard filename for this release"""
        return self.public_law.release_path.replace("/", "-")


class CongressionalSession(BaseModel):
    """Information about a congressional session"""
    congress: int = Field(..., ge=1)
    session: Literal[1, 2] = Field(..., description="1st or 2nd session")
    start_date: date
    end_date: Optional[date] = None
    
    # Leadership
    house_speaker: Optional[Sponsor] = None
    senate_majority_leader: Optional[Sponsor] = None
    house_majority_leader: Optional[Sponsor] = None
    senate_minority_leader: Optional[Sponsor] = None
    
    # Party control
    house_majority_party: Optional[PoliticalParty] = None
    senate_majority_party: Optional[PoliticalParty] = None
    
    @property
    def session_id(self) -> str:
        """Session identifier"""
        return f"{self.congress}-{self.session}"
    
    @property
    def formal_name(self) -> str:
        """Formal session name"""
        ordinal = "1st" if self.session == 1 else "2nd"
        return f"{self.congress}th Congress, {ordinal} Session"
    
    class Config:
        use_enum_values = True


class GitCommitMetadata(BaseModel):
    """Metadata for git commits in the US Code repository"""
    public_law: PublicLaw
    
    # Git data
    commit_hash: str
    tag_name: str
    author_name: str
    author_email: str
    commit_date: datetime
    message: str
    
    # File changes
    files_changed: int
    lines_added: int
    lines_deleted: int
    
    # Repository state
    repository_path: Path
    is_initial_commit: bool = False


class APICache(BaseModel):
    """Cache entry for Congress.gov API responses"""
    cache_key: str
    congress: int
    law_number: int
    
    # Cache metadata
    cached_date: datetime
    api_response: Dict[str, Any]
    sponsor_found: bool = False
    
    # Extracted sponsor (if found)
    sponsor: Optional[Sponsor] = None


class RepositoryMetadata(BaseModel):
    """Overall metadata for the US Code git repository"""
    created_date: datetime
    last_updated: datetime
    
    # Coverage
    earliest_law: PublicLaw
    latest_law: PublicLaw
    total_laws: int
    total_commits: int
    
    # Data sources
    congress_api_key_used: bool
    house_source_verified: bool
    
    # Repository info
    repository_path: Path
    total_size: Optional[int] = None


# Utility functions for model creation

def create_sponsor_from_congress_api(api_data: Dict[str, Any]) -> Sponsor:
    """Create Sponsor from Congress.gov API response"""
    return Sponsor(
        bioguide_id=api_data.get('bioguideId'),
        title=api_data.get('title', ''),
        first_name=api_data.get('firstName', ''),
        last_name=api_data.get('lastName', ''),
        full_name=api_data.get('fullName', ''),
        party=PoliticalParty(api_data.get('party', 'Unknown')),
        state=api_data.get('state', ''),
        district=api_data.get('district'),
        chamber=CongressionalChamber.HOUSE if api_data.get('title') == 'Rep.' else CongressionalChamber.SENATE
    )


def create_public_law_from_house_data(house_data: Dict[str, Any]) -> PublicLaw:
    """Create PublicLaw from House release point data"""
    return PublicLaw(
        congress=house_data['congress'],
        law_number=house_data['law'],
        enacted_date=datetime.strptime(house_data['date'], '%m/%d/%Y').date(),
        release_path=house_data['releasePath'],
        affected_titles=house_data['affectedTitles']
    )