package main

import (
	"database/sql"
	"encoding/json"
	"fmt"
	"net/http"
	"time"

	_ "github.com/lib/pq"
)

//Go Best practices: https://github.com/golovers/effective-go
type Item struct {
	Id                int32       `json:"id"`
	Name              int32       `json:"name"`
	ValueCents        int32       `json:"valueCents"`
	PurchaseCostCents int32       `json:"purchasedCostCents"`
	Aquired           time.Time   `json:"aquired"`
	Description       string      `json:"description"`
	Notes             string      `json:"notes"`
	SoldForCents      int32       `json:"soldForCents"`
	SoldTo            string      `json:"soldTo"`
	Category          Category    `json:"category"`
	Subcategory       Subcategory `json:"subcategory"`
}

type Category struct {
	Id   int32  `json:"id"`
	Name string `json:"name"`
}

type Subcategory struct {
	Id         int32  `json:"id"`
	Name       string `json:"name"`
	CategoryId int32  `json:"categoryId"`
}

func main() {
	http.HandleFunc("/data", get)
	err := http.ListenAndServe(":8080", nil)

	if err != nil {
		panic(err)
	}

}

func get(w http.ResponseWriter, r *http.Request) {
	c := sql_test()

	// if c.Id == 0 {
	// 	w.WriteHeader(http.StatusBadGateway)
	// 	w.Write([]byte("Failed"))
	// 	return
	// }

	jsonBytes, err := json.Marshal(c)

	if err != nil {
		w.WriteHeader(http.StatusMethodNotAllowed)
		w.Write([]byte("Failed 3"))
		return
	}

	w.WriteHeader(http.StatusOK)
	w.Write(jsonBytes)
}

func sql_test() []Category {
	//Note: The postgres driver seems to get confused when no password is supplied, so omit it in the connection sting.
	//https://rajyavardhan.medium.com/when-you-get-relation-does-not-exist-in-postgres-7ffb0c3c674b
	psqlInfo := fmt.Sprintf("host=%s port=%d user=%s dbname=%s sslmode=disable", "localhost", 5432, "postgres", "inventory")
	db, err := sql.Open("postgres", psqlInfo)

	if err != nil {
		panic(err)
	}

	defer db.Close()

	rows, err := db.Query("SELECT * FROM category;")

	if err != nil {
		panic(err)
	}

	defer rows.Close()

	var categories []Category

	for rows.Next() {
		var category Category

		if err = rows.Scan(&category.Id, &category.Name); err != nil {
			println(err.Error())
		}

		categories = append(categories, category)
	}

	return categories
}