Resume-Matcher/apps/backend/app/database.py

"""TinyDB database layer for JSON storage."""

from datetime import datetime, timezone
from pathlib import Path
from typing import Any
from uuid import uuid4

from tinydb import Query, TinyDB
from tinydb.table import Table

from app.config import settings


class Database:
    """TinyDB wrapper for resume matcher data."""

    def __init__(self, db_path: Path | None = None):
        self.db_path = db_path or settings.db_path
        self.db_path.parent.mkdir(parents=True, exist_ok=True)
        self._db: TinyDB | None = None

    @property
    def db(self) -> TinyDB:
        """Lazy initialization of TinyDB instance."""
        if self._db is None:
            self._db = TinyDB(self.db_path)
        return self._db

    @property
    def resumes(self) -> Table:
        """Resumes table."""
        return self.db.table("resumes")

    @property
    def jobs(self) -> Table:
        """Job descriptions table."""
        return self.db.table("jobs")

    @property
    def improvements(self) -> Table:
        """Improvement results table."""
        return self.db.table("improvements")

    def close(self) -> None:
        """Close database connection."""
        if self._db is not None:
            self._db.close()
            self._db = None

    # Resume operations
    def create_resume(
        self,
        content: str,
        content_type: str = "md",
        filename: str | None = None,
        is_master: bool = False,
        parent_id: str | None = None,
        processed_data: dict[str, Any] | None = None,
        processing_status: str = "pending",
        cover_letter: str | None = None,
        outreach_message: str | None = None,
    ) -> dict[str, Any]:
        """Create a new resume entry.

        processing_status: "pending", "processing", "ready", "failed"
        """
        resume_id = str(uuid4())
        now = datetime.now(timezone.utc).isoformat()

        doc = {
            "resume_id": resume_id,
            "content": content,
            "content_type": content_type,
            "filename": filename,
            "is_master": is_master,
            "parent_id": parent_id,
            "processed_data": processed_data,
            "processing_status": processing_status,
            "cover_letter": cover_letter,
            "outreach_message": outreach_message,
            "created_at": now,
            "updated_at": now,
        }
        self.resumes.insert(doc)
        return doc

    def get_resume(self, resume_id: str) -> dict[str, Any] | None:
        """Get resume by ID."""
        Resume = Query()
        result = self.resumes.search(Resume.resume_id == resume_id)
        return result[0] if result else None

    def get_master_resume(self) -> dict[str, Any] | None:
        """Get the master resume if exists."""
        Resume = Query()
        result = self.resumes.search(Resume.is_master == True)
        return result[0] if result else None

    def update_resume(
        self, resume_id: str, updates: dict[str, Any]
    ) -> dict[str, Any] | None:
        """Update resume by ID."""
        Resume = Query()
        updates["updated_at"] = datetime.now(timezone.utc).isoformat()
        self.resumes.update(updates, Resume.resume_id == resume_id)
        return self.get_resume(resume_id)

    def delete_resume(self, resume_id: str) -> bool:
        """Delete resume by ID."""
        Resume = Query()
        removed = self.resumes.remove(Resume.resume_id == resume_id)
        return len(removed) > 0

    def list_resumes(self) -> list[dict[str, Any]]:
        """List all resumes."""
        return list(self.resumes.all())

    def set_master_resume(self, resume_id: str) -> bool:
        """Set a resume as the master, unsetting any existing master."""
        Resume = Query()
        # Unset current master
        self.resumes.update({"is_master": False}, Resume.is_master == True)
        # Set new master
        updated = self.resumes.update(
            {"is_master": True}, Resume.resume_id == resume_id
        )
        return len(updated) > 0

    # Job operations
    def create_job(
        self, content: str, resume_id: str | None = None
    ) -> dict[str, Any]:
        """Create a new job description entry."""
        job_id = str(uuid4())
        now = datetime.now(timezone.utc).isoformat()

        doc = {
            "job_id": job_id,
            "content": content,
            "resume_id": resume_id,
            "created_at": now,
        }
        self.jobs.insert(doc)
        return doc

    def get_job(self, job_id: str) -> dict[str, Any] | None:
        """Get job by ID."""
        Job = Query()
        result = self.jobs.search(Job.job_id == job_id)
        return result[0] if result else None

    # Improvement operations
    def create_improvement(
        self,
        original_resume_id: str,
        tailored_resume_id: str,
        job_id: str,
        improvements: list[dict[str, Any]],
    ) -> dict[str, Any]:
        """Create an improvement result entry."""
        request_id = str(uuid4())
        now = datetime.now(timezone.utc).isoformat()

        doc = {
            "request_id": request_id,
            "original_resume_id": original_resume_id,
            "tailored_resume_id": tailored_resume_id,
            "job_id": job_id,
            "improvements": improvements,
            "created_at": now,
        }
        self.improvements.insert(doc)
        return doc

    def get_improvement_by_tailored_resume(
        self, tailored_resume_id: str
    ) -> dict[str, Any] | None:
        """Get improvement record by tailored resume ID.

        This is used to retrieve the job context for on-demand
        cover letter and outreach message generation.
        """
        Improvement = Query()
        result = self.improvements.search(
            Improvement.tailored_resume_id == tailored_resume_id
        )
        return result[0] if result else None

    # Stats
    def get_stats(self) -> dict[str, Any]:
        """Get database statistics."""
        return {
            "total_resumes": len(self.resumes),
            "total_jobs": len(self.jobs),
            "total_improvements": len(self.improvements),
            "has_master_resume": self.get_master_resume() is not None,
        }


# Global database instance
db = Database()