package service

import (
	"context"
	"log/slog"
	"spend-sparrow/internal/db"
	"spend-sparrow/internal/types"
	"time"

	"github.com/jmoiron/sqlx"
)

type Dashboard struct {
	db *sqlx.DB
}

func NewDashboard(db *sqlx.DB) *Dashboard {
	return &Dashboard{
		db: db,
	}
}

func (s Dashboard) Summary(ctx context.Context, user *types.User, month time.Time) (*types.DashboardMonthlySummary, error) {
	if user == nil {
		return nil, ErrUnauthorized
	}

	var summary types.DashboardMonthlySummary

	var value *int64
	err := s.db.GetContext(ctx, &value, `
		SELECT SUM(value)
		FROM "transaction"
		WHERE user_id = $1 
			AND treasure_chest_id IS NOT NULL
			AND account_id IS NULL
			AND error IS NULL
			AND date(timestamp, 'start of month') = date($2, 'start of month')`,
		user.Id, month)
	err = db.TransformAndLogDbError("dashboard", nil, err)
	if err != nil {
		return nil, err
	}
	if value != nil {
		summary.Savings = *value
	}

	err = s.db.GetContext(ctx, &value, `
		SELECT SUM(value)
		FROM "transaction"
		WHERE user_id = $1
			AND account_id IS NOT NULL
			AND treasure_chest_id IS NULL
			AND error IS NULL
			AND date(timestamp, 'start of month') = date($2, 'start of month')`,
		user.Id, month)
	err = db.TransformAndLogDbError("dashboard", nil, err)
	if err != nil {
		return nil, err
	}
	if value != nil {
		summary.Income = *value
	}

	// err = s.db.GetContext(ctx, &summary.Expenses, `
	// 	SELECT SUM(value)
	// 	FROM "transaction"
	// 	WHERE user_id = $1
	// 		AND account_id IS NOT NULL
	// 		AND treasure_chest_id IS NOT NULL
	// 		AND error IS NULL
	// 		AND date(timestamp, 'start of month') = date($2, 'start of month')`,
	// 	user.Id, month)
	// err = db.TransformAndLogDbError("dashboard", nil, err)
	// if err != nil {
	// 	return nil, err
	// }

	summary.Total = summary.Income - summary.Expenses
	summary.Month = month

	slog.Info("Dashboard summary", "summary", summary)

	return &summary, nil
}