package database

import (
	"database/sql"
	"log"

	_ "github.com/mattn/go-sqlite3"

	"github.com/HoHD/PR-Helper/models"
)

type DB struct {
	conn *sql.DB
}

func New(dbPath string) (*DB, error) {
	conn, err := sql.Open("sqlite3", dbPath+"?_journal_mode=WAL&_busy_timeout=5000")
	if err != nil {
		return nil, err
	}
	db := &DB{conn: conn}
	if err := db.migrate(); err != nil {
		return nil, err
	}
	if err := db.seedDefaults(); err != nil {
		return nil, err
	}
	return db, nil
}

func (db *DB) Close() error {
	return db.conn.Close()
}

func (db *DB) Conn() *sql.DB {
	return db.conn
}

func (db *DB) migrate() error {
	stmts := []string{
		`CREATE TABLE IF NOT EXISTS settings (
			key   TEXT PRIMARY KEY,
			value TEXT NOT NULL
		)`,
		`CREATE TABLE IF NOT EXISTS repositories (
			id         INTEGER PRIMARY KEY AUTOINCREMENT,
			url        TEXT NOT NULL UNIQUE,
			local_path TEXT NOT NULL,
			size_bytes INTEGER DEFAULT 0,
			cloned_at  DATETIME DEFAULT CURRENT_TIMESTAMP,
			last_used  DATETIME DEFAULT CURRENT_TIMESTAMP
		)`,
		`CREATE TABLE IF NOT EXISTS analyses (
			id          INTEGER PRIMARY KEY AUTOINCREMENT,
			repo_id     INTEGER REFERENCES repositories(id),
			type        TEXT NOT NULL,
			base_ref    TEXT NOT NULL,
			head_ref    TEXT NOT NULL,
			result      TEXT,
			created_at  DATETIME DEFAULT CURRENT_TIMESTAMP
		)`,
		`CREATE TABLE IF NOT EXISTS review_notes (
			id          INTEGER PRIMARY KEY AUTOINCREMENT,
			analysis_id INTEGER REFERENCES analyses(id),
			scope       TEXT NOT NULL,
			scope_key   TEXT NOT NULL,
			content     TEXT NOT NULL,
			created_at  DATETIME DEFAULT CURRENT_TIMESTAMP,
			updated_at  DATETIME DEFAULT CURRENT_TIMESTAMP
		)`,
	}
	for _, s := range stmts {
		if _, err := db.conn.Exec(s); err != nil {
			return err
		}
	}
	return nil
}

func (db *DB) seedDefaults() error {
	for key, val := range models.DefaultSettings {
		_, err := db.conn.Exec(
			`INSERT OR IGNORE INTO settings (key, value) VALUES (?, ?)`, key, val,
		)
		if err != nil {
			log.Printf("warning: failed to seed setting %s: %v", key, err)
		}
	}
	return nil
}