package server

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

	"github.com/gin-gonic/gin"

	"warpbox/lib/metastore"
)

const accountSessionCookie = "warpbox_account_session"

func (app *App) registerAccountRoutes(router *gin.Engine) {
	account := router.Group("/account")
	account.Use(noStoreAdminHeaders)
	account.GET("/login", app.handleAccountLogin)
	account.POST("/login", app.handleAccountLoginPost)

	protected := account.Group("")
	protected.Use(app.requireAccountSession)
	protected.GET("", app.handleAccountDashboard)
	protected.GET("/", app.handleAccountDashboard)
	protected.POST("/logout", app.handleAccountLogout)
	protected.GET("/settings", app.handleAccountSettings)
	protected.POST("/settings", app.handleAccountSettingsPost)
	protected.POST("/settings/reset", app.handleAccountSettingsReset)
	protected.GET("/settings/export.json", app.handleAccountSettingsExport)
	protected.POST("/settings/import.json", app.handleAccountSettingsImport)
	protected.GET("/alerts", app.handleAccountAlerts)
	protected.GET("/alerts/export.json", app.handleAccountAlertsExport)
	protected.POST("/alerts/bulk/acknowledge", app.handleAccountAlertBulkAcknowledge)
	protected.POST("/alerts/bulk/close", app.handleAccountAlertBulkClose)
	protected.POST("/alerts/:id/acknowledge", app.handleAccountAlertAcknowledge)
	protected.POST("/alerts/:id/close", app.handleAccountAlertClose)
	protected.GET("/boxes", app.handleAccountBoxes)
	protected.GET("/boxes/export.csv", app.handleAccountBoxesExport)
	protected.POST("/boxes/bulk/expire", app.handleAccountBoxesBulkExpire)
	protected.POST("/boxes/bulk/delete", app.handleAccountBoxesBulkDelete)
	protected.POST("/boxes/bulk/bump-expiry", app.handleAccountBoxesBulkBumpExpiry)
	protected.POST("/boxes/delete-largest", app.handleAccountBoxesDeleteLargest)
	protected.GET("/boxes/:id", app.handleAccountBoxManager)
	protected.POST("/boxes/:id", app.handleAccountBoxUpdate)
	protected.POST("/boxes/:id/extend", app.handleAccountBoxExtend)
	protected.POST("/boxes/:id/expire", app.handleAccountBoxExpire)
	protected.POST("/boxes/:id/delete", app.handleAccountBoxDelete)
	protected.POST("/boxes/:id/password", app.handleAccountBoxPassword)
	protected.POST("/boxes/:id/password/remove", app.handleAccountBoxPasswordRemove)
	protected.POST("/boxes/:id/files/delete", app.handleAccountBoxFilesDelete)
}

func (app *App) handleAccountLogin(ctx *gin.Context) {
	if app.isAccountSessionValid(ctx) {
		ctx.Redirect(http.StatusSeeOther, "/account")
		return
	}
	app.renderAccountLogin(ctx, "")
}

func (app *App) handleAccountLoginPost(ctx *gin.Context) {
	if !app.adminLoginEnabled {
		app.renderAccountLogin(ctx, "Account login is disabled.")
		return
	}

	username := strings.TrimSpace(ctx.PostForm("username"))
	password := ctx.PostForm("password")
	user, ok, err := app.store.GetUserByUsername(username)
	if err != nil {
		ctx.String(http.StatusInternalServerError, "Could not load user")
		return
	}
	if !ok || user.Disabled || !metastore.VerifyPassword(user.PasswordHash, password) {
		app.renderAccountLogin(ctx, "The username or password was not accepted.")
		return
	}

	if _, err := app.permissionsForUser(user); err != nil {
		ctx.String(http.StatusInternalServerError, "Could not load permissions")
		return
	}

	session, err := app.store.CreateSession(user.ID, time.Duration(app.config.SessionTTLSeconds)*time.Second)
	if err != nil {
		ctx.String(http.StatusInternalServerError, "Could not create session")
		return
	}
	ctx.SetSameSite(http.SameSiteLaxMode)
	ctx.SetCookie(accountSessionCookie, session.Token, int(app.config.SessionTTLSeconds), "/account", "", app.config.AdminCookieSecure, true)
	ctx.Redirect(http.StatusSeeOther, "/account")
}

func (app *App) handleAccountLogout(ctx *gin.Context) {
	if token, err := ctx.Cookie(accountSessionCookie); err == nil {
		_ = app.store.DeleteSession(token)
	}
	ctx.SetSameSite(http.SameSiteLaxMode)
	ctx.SetCookie(accountSessionCookie, "", -1, "/account", "", app.config.AdminCookieSecure, true)
	ctx.Redirect(http.StatusSeeOther, "/account/login")
}

func (app *App) requireAccountSession(ctx *gin.Context) {
	token, err := ctx.Cookie(accountSessionCookie)
	if err != nil {
		ctx.Redirect(http.StatusSeeOther, "/account/login")
		ctx.Abort()
		return
	}
	session, ok, err := app.store.GetSession(token)
	if err != nil || !ok {
		ctx.Redirect(http.StatusSeeOther, "/account/login")
		ctx.Abort()
		return
	}
	if !validAdminCSRF(ctx, session) {
		ctx.String(http.StatusForbidden, "Permission denied")
		ctx.Abort()
		return
	}
	user, ok, err := app.store.GetUser(session.UserID)
	if err != nil || !ok || user.Disabled {
		ctx.Redirect(http.StatusSeeOther, "/account/login")
		ctx.Abort()
		return
	}
	perms, err := app.permissionsForUser(user)
	if err != nil {
		ctx.Redirect(http.StatusSeeOther, "/account/login")
		ctx.Abort()
		return
	}

	ctx.Set("accountUser", user)
	ctx.Set("adminUser", user)
	ctx.Set("accountPerms", perms)
	ctx.Set("adminPerms", perms)
	ctx.Set("accountSession", session)
	ctx.Set("accountCSRFToken", session.CSRFToken)
	ctx.Set("adminCSRFToken", session.CSRFToken)
	ctx.Next()
}

func (app *App) isAccountSessionValid(ctx *gin.Context) bool {
	token, err := ctx.Cookie(accountSessionCookie)
	if err != nil {
		return false
	}
	session, ok, err := app.store.GetSession(token)
	if err != nil || !ok {
		return false
	}
	user, ok, err := app.store.GetUser(session.UserID)
	if err != nil || !ok || user.Disabled {
		return false
	}
	_, err = app.permissionsForUser(user)
	return err == nil
}

func (app *App) renderAccountLogin(ctx *gin.Context, errorMessage string) {
	ctx.HTML(http.StatusOK, "account_login.html", gin.H{
		"PageTitle":           "WarpBox Account Login",
		"AdminLoginEnabled":   app.adminLoginEnabled,
		"AccountLoginEnabled": app.adminLoginEnabled,
		"Error":               errorMessage,
	})
}

func currentAccountUser(ctx *gin.Context) (metastore.User, bool) {
	if current, ok := ctx.Get("accountUser"); ok {
		if user, ok := current.(metastore.User); ok {
			return user, true
		}
	}
	if current, ok := ctx.Get("adminUser"); ok {
		if user, ok := current.(metastore.User); ok {
			return user, true
		}
	}
	return metastore.User{}, false
}