from dataclasses import dataclass, field
from datetime import datetime
from typing import List, Optional

from dataclasses_json import dataclass_json


@dataclass_json
@dataclass
class Author:
    """Represents a git author."""
    name: str
    email: str
    commit_count: int = 0
    lines_added: int = 0
    lines_deleted: int = 0


@dataclass_json
@dataclass
class Commit:
    """Represents a git commit."""
    sha: str
    message: str
    author: str
    author_email: str
    timestamp: datetime
    lines_added: int = 0
    lines_deleted: int = 0
    files_changed: List[str] = field(default_factory=list)
    is_merge: bool = False
    is_revert: bool = False


@dataclass_json
@dataclass
class FileChange:
    """Represents changes to a file in a commit."""
    filepath: str
    lines_added: int
    lines_deleted: int
    change_type: str


@dataclass_json
@dataclass
class CommitAnalysis:
    """Analysis of commit patterns."""
    total_commits: int
    unique_authors: int
    commits_by_hour: dict
    commits_by_day: dict
    commits_by_week: dict
    top_authors: List[Author]
    average_commits_per_day: float


@dataclass_json
@dataclass
class CodeChurnAnalysis:
    """Analysis of code churn."""
    total_lines_added: int
    total_lines_deleted: int
    net_change: int
    churn_by_file: dict
    churn_by_author: dict
    high_churn_commits: List[Commit]
    average_churn_per_commit: float


@dataclass_json
@dataclass
class RiskyCommitAnalysis:
    """Analysis of risky commits."""
    total_risky_commits: int
    large_change_commits: List[Commit]
    merge_commits: List[Commit]
    revert_commits: List[Commit]
    risk_score: float


@dataclass_json
@dataclass
class VelocityAnalysis:
    """Analysis of team velocity."""
    commits_per_day: float
    commits_per_week: float
    commits_per_month: float
    velocity_trend: str
    top_contributors: List[Author]
    most_active_day: str
    most_active_hour: str


@dataclass_json
@dataclass
class ProductivityReport:
    """Comprehensive productivity report."""
    repository_path: str
    analysis_days: int
    commit_analysis: Optional[CommitAnalysis]
    code_churn_analysis: Optional[CodeChurnAnalysis]
    risky_commit_analysis: Optional[RiskyCommitAnalysis]
    velocity_analysis: Optional[VelocityAnalysis]