package http

import (
	"io/fs"
	"net/http"
	"strings"
	"time"

	"git.javil.eu/jacob1123/budgeteer"
	"git.javil.eu/jacob1123/budgeteer/bcrypt"
	"git.javil.eu/jacob1123/budgeteer/postgres"
	"git.javil.eu/jacob1123/budgeteer/web"

	"github.com/gin-gonic/gin"
)

// Handler handles incoming requests
type Handler struct {
	Service             *postgres.Database
	TokenVerifier       budgeteer.TokenVerifier
	CredentialsVerifier *bcrypt.Verifier
}

const (
	expiration = 72
)

// Serve starts the HTTP Server
func (h *Handler) Serve() {
	router := gin.Default()
	router.FuncMap["now"] = time.Now

	static, err := fs.Sub(web.Static, "dist")
	if err != nil {
		panic("couldn't open static files")
	}
	staticFS := http.FS(static)

	router.Use(enableCachingForStaticFiles())
	router.NoRoute(
		func(c *gin.Context) {
			c.FileFromFS(c.Request.URL.Path, staticFS)
		},
	)

	withLogin := router.Group("")
	withLogin.Use(h.verifyLoginWithRedirect)

	withBudget := router.Group("")
	withBudget.Use(h.verifyLoginWithForbidden)
	withBudget.GET("/budget/:budgetid/:year/:month", h.budgeting)
	withBudget.GET("/budget/:budgetid/all-accounts", h.allAccounts)
	withBudget.GET("/budget/:budgetid/settings/clean-negative", h.cleanNegativeBudget)
	withBudget.GET("/budget/:budgetid/transaction/:transactionid", h.transaction)

	api := router.Group("/api/v1")

	unauthenticated := api.Group("/user")
	unauthenticated.GET("/login", func(c *gin.Context) { c.Redirect(http.StatusPermanentRedirect, "/login") })
	unauthenticated.POST("/login", h.loginPost)
	unauthenticated.POST("/register", h.registerPost)

	authenticated := api.Group("")
	authenticated.Use(h.verifyLoginWithForbidden)
	authenticated.GET("/dashboard", h.dashboard)
	authenticated.GET("/account/:accountid/transactions", h.transactionsForAccount)
	authenticated.GET("/admin/clear-database", h.clearDatabase)
	authenticated.GET("/budget/:budgetid", h.budgeting)
	authenticated.POST("/budget/:budgetid/import/ynab", h.importYNAB)
	authenticated.POST("/budget/:budgetid/settings/clear", h.clearBudget)

	budget := authenticated.Group("/budget")
	budget.POST("/new", h.newBudget)

	transaction := authenticated.Group("/transaction")
	transaction.POST("/new", h.newTransaction)
	transaction.POST("/:transactionid", h.newTransaction)

	router.Run(":1323")
}

func enableCachingForStaticFiles() gin.HandlerFunc {
	return func(c *gin.Context) {
		if strings.HasPrefix(c.Request.RequestURI, "/static/") {
			c.Header("Cache-Control", "max-age=86400")
		}
	}
}