"""
Pydantic models for FitScore Feedback Agent API
"""

import re
import json
from pydantic import BaseModel, field_validator, ConfigDict
from typing import Dict, Any, Optional, List
from datetime import datetime


def sanitize_text(text: str) -> str:
    """Sanitize text by removing invalid control characters"""
    if not text:
        return text
    
    # Remove invalid control characters (except \n, \r, \t)
    # Keep only printable characters and common whitespace
    sanitized = re.sub(r'[\x00-\x08\x0B\x0C\x0E-\x1F\x7F]', '', str(text))
    
    # Normalize whitespace
    sanitized = re.sub(r'\s+', ' ', sanitized)
    
    # Strip leading/trailing whitespace
    sanitized = sanitized.strip()
    
    return sanitized


class FitScoreRequest(BaseModel):
    """Simplified request model for FitScore calculation - only essential fields"""
    model_config = ConfigDict(protected_namespaces=())
    
    job_id: str
    jd_text: str  # Job description text
    resume_text: str
    
    @field_validator('job_id', 'jd_text', 'resume_text')
    @classmethod
    def sanitize_text_fields(cls, v):
        """Sanitize text fields to remove invalid control characters"""
        if v is not None:
            return sanitize_text(v)
        return v


class CandidateRequest(BaseModel):
    """Request model for candidate evaluation"""
    model_config = ConfigDict(protected_namespaces=())
    
    candidate_id: str
    job_id: str
    recruiter_id: Optional[str] = None  # Made optional to match database schema
    name: str
    email: str
    phone: Optional[str] = None
    location: Optional[str] = None
    resume_text: str
    job_description: Optional[str] = None  # Job description for FitScore API
    resume_url: Optional[str] = None
    linkedin_url: Optional[str] = None
    
    @field_validator('email')
    @classmethod
    def validate_email(cls, v):
        if v and '@' not in v:
            raise ValueError('Invalid email format')
        return v
    
    @field_validator('name', 'location', 'resume_text', 'phone', 'linkedin_url', 'resume_url', 'job_description')
    @classmethod
    def sanitize_text_fields(cls, v):
        """Sanitize text fields to remove invalid control characters"""
        if v is not None:
            return sanitize_text(v)
        return v


class FeedbackRequest(BaseModel):
    """Request model for feedback submission"""
    model_config = ConfigDict(protected_namespaces=())
    
    job_id: str
    company_id: str
    analysis_id: str
    feedback_type: str  # hired, accepted, rejected, interviewed
    feedback_text: str
    feedback_category: str  # skills, experience, location, education, other
    confidence_score: float
    email: Optional[str] = None
    linkedin_url: Optional[str] = None
    
    @field_validator('feedback_type')
    @classmethod
    def validate_feedback_type(cls, v):
        valid_types = ['hired', 'accepted', 'rejected', 'interviewed']
        if v not in valid_types:
            raise ValueError(f'Feedback type must be one of: {", ".join(valid_types)}')
        return v
    
    @field_validator('feedback_category')
    @classmethod
    def validate_feedback_category(cls, v):
        valid_categories = ['skills', 'experience', 'location', 'education', 'other']
        if v not in valid_categories:
            raise ValueError(f'Feedback category must be one of: {", ".join(valid_categories)}')
        return v
    
    @field_validator('confidence_score')
    @classmethod
    def validate_confidence_score(cls, v):
        if not 0.0 <= v <= 1.0:
            raise ValueError('Confidence score must be between 0.0 and 1.0')
        return v
    
    @field_validator('feedback_text', 'email', 'linkedin_url')
    @classmethod
    def sanitize_text_fields(cls, v):
        """Sanitize text fields to remove invalid control characters"""
        if v is not None:
            return sanitize_text(v)
        return v


class FitScoreResponse(BaseModel):
    """Response model for FitScore calculation"""
    model_config = ConfigDict(protected_namespaces=())
    
    success: bool
    evaluation_id: str
    fitscore: float
    verdict: str
    confidence: float
    category_scores: Dict[str, float]
    justification: str
    model_version: str
    timestamp: str


class FeedbackResponse(BaseModel):
    """Response model for feedback submission"""
    model_config = ConfigDict(protected_namespaces=())
    
    success: bool
    feedback_id: str
    learning_event_id: str
    message: str


class RecalculateResponse(BaseModel):
    """Response model for FitScore recalculation"""
    model_config = ConfigDict(protected_namespaces=())
    
    success: bool
    original_evaluation_id: str
    updated_evaluation_id: str
    original_fitscore: float
    updated_fitscore: float
    score_change: float
    original_verdict: str
    updated_verdict: str
    verdict_changed: bool
    model_version: str
    timestamp: str


class ComparisonResponse(BaseModel):
    """Response model for results comparison"""
    model_config = ConfigDict(protected_namespaces=())
    
    success: bool
    comparison: Dict[str, Any]


class AnalyticsResponse(BaseModel):
    """Response model for analytics"""
    model_config = ConfigDict(protected_namespaces=())
    
    total_feedback: int
    feedback_by_type: Dict[str, int]
    feedback_by_category: Dict[str, int]
    patterns_count: int


class HealthResponse(BaseModel):
    """Response model for health check"""
    model_config = ConfigDict(protected_namespaces=())
    
    status: str
    service: str
    version: str
    timestamp: str


class RootResponse(BaseModel):
    """Response model for root endpoint"""
    model_config = ConfigDict(protected_namespaces=())
    
    message: str
    version: str
    status: str
    endpoints: List[str]