package main

import (
	"embed"
	"fmt"
	"github.com/go-chi/chi"
	"github.com/go-chi/chi/middleware"
	"github.com/google/uuid"
	"github.com/joho/godotenv"
	_ "github.com/lib/pq"
	"holiday-api/holiday"
	"holiday-api/migration"
	"html/template"
	"log"
	"net/http"
	"os"
	"strconv"
	"strings"
	"time"
)

//go:embed db/dev/*.sql
var devMigrations embed.FS

//go:embed db/prod/*.sql
var prodMigrations embed.FS

var isDev = false

func init() {
	godotenv.Load()
	if strings.Contains(os.Getenv("PROFILE"), "dev") {
		isDev = true
	}
	log.SetPrefix("")
	log.SetFlags(log.Ldate | log.Ltime | log.Lshortfile)
}

func main() {
	client, err := connectToDb()
	if err != nil {
		log.Fatalf("couldn't connect to db: %v", err)
	}
	migrationFolder := prodMigrations
	if isDev {
		migrationFolder = devMigrations
	}
	if err := migration.InitializeMigrations(client, migrationFolder); err != nil {
		log.Fatalf("couldn't execute migrations: %v", err)
	}

	r := chi.NewRouter()
	r.Use(middleware.RequestID)
	r.Use(middleware.RealIP)
	r.Use(middleware.Logger)
	r.Use(middleware.Recoverer)

	holidayService := holiday.Service{client}

	r.Get("/api/v1/holidays", getHolidays(holidayService))

	r.Mount("/admin", adminDashboard(holidayService))

	log.Fatal(http.ListenAndServe(":5281", r))
}

func adminDashboard(service holiday.Service) http.Handler {
	r := chi.NewRouter()

	credentials := loadCredentials()
	templates, err := template.New("").Funcs(template.FuncMap{
		"boolcmp": func(value *bool, expected string) bool {
			if value == nil {
				return expected == "nil"
			} else {
				return (*value && expected == "true") || (!(*value) && expected == "false")
			}
		},
		"deferint": func(value *int) int { return *value },
	}).ParseFiles("templates/index.gohtml", "templates/holiday.gohtml", "templates/error.gohtml")
	if err != nil {
		log.Fatalf("couldn't load templates: %v", err)
	}

	r.Use(middleware.BasicAuth("/admin", credentials))

	r.Get("/holiday", func(w http.ResponseWriter, r *http.Request) {
		r.ParseForm()
		id := r.FormValue("id")

		response := HolidaySingleResponse{
			Id:                 nil,
			Country:            "",
			Date:               DateResponse{time.Now()},
			Name:               "",
			Description:        "",
			IsStateHoliday:     true,
			IsReligiousHoliday: false,
		}

		if id != "" {
			if h, err := service.FindById(uuid.Must(uuid.Parse(id))); err == nil {
				response = HolidaySingleResponse{
					Id:                 &h.Id,
					Country:            h.Country,
					Date:               DateResponse{h.Date},
					Name:               h.Name,
					Description:        h.Description,
					IsStateHoliday:     h.IsStateHoliday,
					IsReligiousHoliday: h.IsReligiousHoliday,
				}
			}
		}
		renderTemplate(w, r, 200, templates, "holiday.gohtml", response)
	})

	r.Post("/holiday/delete", func(w http.ResponseWriter, r *http.Request) {
		r.ParseForm()
		var id uuid.UUID
		if i := r.FormValue("id"); i != "" {
			id = uuid.MustParse(i)
		} else {
			log.Printf("Failed deleting holiday: missing id", err)
			w.WriteHeader(500)
			w.Write([]byte("There was an error"))
		}
		err := service.Delete(id)
		if err != nil {
			log.Printf("Failed deleting holiday: %v", err)
			w.WriteHeader(500)
			w.Write([]byte("There was an error"))
		} else {
			w.Header().Add("Location", "/admin")
			w.WriteHeader(http.StatusSeeOther)
			w.Write([]byte{})
		}
	})

	r.Post("/holiday", func(w http.ResponseWriter, r *http.Request) {
		r.ParseForm()
		var id *uuid.UUID = nil
		if i := r.FormValue("id"); i != "" {
			temp := uuid.MustParse(i)
			id = &temp
		}
		name := strings.TrimSpace(r.FormValue("name"))
		description := strings.TrimSpace(r.FormValue("description"))
		isStateHoliday := parseCheckbox(r.FormValue("stateHoliday"))
		isReligiousHoliday := parseCheckbox(r.FormValue("religiousHoliday"))
		date := parseDate(r.FormValue("date"))
		country := r.FormValue("country")

		hol := holiday.Holiday{
			Country:            country,
			Date:               date,
			Name:               name,
			Description:        description,
			IsStateHoliday:     isStateHoliday,
			IsReligiousHoliday: isReligiousHoliday,
		}

		var err error
		if id != nil {
			hol.Id = *id
			hol, err = service.Update(hol)
		} else {
			hol, err = service.Create(hol)
		}
		if err != nil {
			log.Printf("Failed updating or creating holiday: %v", err)
			w.WriteHeader(500)
			w.Write([]byte("There was an error"))
		} else {
			w.Header().Add("Location", "/admin/holiday?id="+hol.Id.String())
			w.WriteHeader(http.StatusSeeOther)
			w.Write([]byte{})
		}
	})

	r.Get("/", func(w http.ResponseWriter, r *http.Request) {
		r.ParseForm()
		country := r.FormValue("country")
		if country == "" {
			country = "HR"
		}
		var stateHoliday *bool = nil
		if h := r.FormValue("stateHoliday"); h != "" {
			if hol, err := strconv.ParseBool(h); err == nil {
				stateHoliday = &hol
			}
		}
		var religiousHoliday *bool = nil
		if h := r.FormValue("religiousHoliday"); h != "" {
			if hol, err := strconv.ParseBool(h); err == nil {
				religiousHoliday = &hol
			}
		}
		year := time.Now().Year()
		if y := r.FormValue("year"); y != "" {
			if yr, err := strconv.ParseInt(y, 10, 64); err == nil {
				year = int(yr)
			}
		}

		search := holiday.Search{Year: &year, Country: country, StateHoliday: stateHoliday, ReligiousHoliday: religiousHoliday}

		holidays, _ := service.Find(search, holiday.Paging{PageSize: 100})
		holidayResponse := mapHolidays(holidays)

		response := map[string]any{}
		response["holidays"] = holidayResponse
		response["search"] = search

		renderTemplate(w, r, 200, templates, "index.gohtml", response)
	})

	return r
}

func parseDate(date string) time.Time {
	var year, month, day int
	fmt.Sscanf(date, "%d-%d-%d", &year, &month, &day)
	return time.Date(year, time.Month(month), day, 0, 0, 0, 0, time.UTC)
}

func parseCheckbox(value string) bool {
	if value != "" {
		return true
	}
	return false
}

func loadCredentials() map[string]string {
	credentials := envMustExist("AUTH_KEY")
	values := strings.Split(credentials, ":")
	return map[string]string{values[0]: values[1]}
}