package services

import (
	"database/sql"
	"log"
	"stocksearch/config"

	_ "github.com/lib/pq"
)

var db *sql.DB

// InitDB PostgreSQL 연결 초기화 및 스키마 생성
func InitDB() {
	dsn := config.App.DatabaseURL
	if dsn == "" {
		log.Println("DATABASE_URL 미설정 — DB 없이 메모리 모드로 동작")
		return
	}

	var err error
	db, err = sql.Open("postgres", dsn)
	if err != nil {
		log.Fatalf("DB 연결 실패: %v", err)
	}
	if err = db.Ping(); err != nil {
		log.Fatalf("DB ping 실패: %v", err)
	}

	db.SetMaxOpenConns(10)
	db.SetMaxIdleConns(5)

	createTables()
	log.Println("PostgreSQL 연결 완료")
}

// GetDB DB 인스턴스 반환 (nil이면 DB 미사용)
func GetDB() *sql.DB {
	return db
}

func createTables() {
	schema := `
	CREATE TABLE IF NOT EXISTS autotrade_rules (
		id          TEXT PRIMARY KEY,
		name        TEXT NOT NULL,
		enabled     BOOLEAN NOT NULL DEFAULT true,
		min_rise_score   INTEGER NOT NULL DEFAULT 60,
		min_cntr_str     REAL NOT NULL DEFAULT 110,
		require_bullish  BOOLEAN NOT NULL DEFAULT false,
		order_amount     BIGINT NOT NULL DEFAULT 1000000,
		max_positions    INTEGER NOT NULL DEFAULT 3,
		stop_loss1_pct   REAL NOT NULL DEFAULT -2.0,
		stop_loss1_count INTEGER NOT NULL DEFAULT 3,
		stop_loss_pct    REAL NOT NULL DEFAULT -4.0,
		take_profit_pct  REAL NOT NULL DEFAULT 5.0,
		max_hold_minutes INTEGER NOT NULL DEFAULT 60,
		exit_before_close BOOLEAN NOT NULL DEFAULT true,
		created_at  TIMESTAMPTZ NOT NULL DEFAULT NOW()
	);

	CREATE TABLE IF NOT EXISTS autotrade_positions (
		id              SERIAL PRIMARY KEY,
		code            TEXT NOT NULL,
		name            TEXT NOT NULL DEFAULT '',
		buy_price       BIGINT NOT NULL DEFAULT 0,
		qty             BIGINT NOT NULL DEFAULT 0,
		order_no        TEXT NOT NULL DEFAULT '',
		entry_time      TIMESTAMPTZ NOT NULL DEFAULT NOW(),
		rule_id         TEXT NOT NULL DEFAULT '',
		stop_loss1      BIGINT NOT NULL DEFAULT 0,
		stop_loss1_touches INTEGER NOT NULL DEFAULT 0,
		stop_loss       BIGINT NOT NULL DEFAULT 0,
		take_profit     BIGINT NOT NULL DEFAULT 0,
		status          TEXT NOT NULL DEFAULT 'pending',
		exit_time       TIMESTAMPTZ,
		exit_price      BIGINT NOT NULL DEFAULT 0,
		exit_reason     TEXT NOT NULL DEFAULT ''
	);
	CREATE INDEX IF NOT EXISTS idx_positions_status ON autotrade_positions(status);
	CREATE INDEX IF NOT EXISTS idx_positions_exit_time ON autotrade_positions(exit_time);

	CREATE TABLE IF NOT EXISTS autotrade_logs (
		id          SERIAL PRIMARY KEY,
		at          TIMESTAMPTZ NOT NULL DEFAULT NOW(),
		level       TEXT NOT NULL DEFAULT 'info',
		message     TEXT NOT NULL DEFAULT '',
		code        TEXT NOT NULL DEFAULT ''
	);
	CREATE INDEX IF NOT EXISTS idx_logs_at ON autotrade_logs(at);

	CREATE TABLE IF NOT EXISTS autotrade_watch_source (
		id              INTEGER PRIMARY KEY DEFAULT 1,
		use_scanner     BOOLEAN NOT NULL DEFAULT true,
		selected_themes JSONB NOT NULL DEFAULT '[]'
	);
	`
	if _, err := db.Exec(schema); err != nil {
		log.Fatalf("스키마 생성 실패: %v", err)
	}
}