package web

import (
	"errors"
	"fmt"
	"net/http"
	"strings"

	"gardomatic.kleiax.de/lib/client"
)

type adminRoleForm struct {
	Role string `form:"role"`
}

type adminUserInviteForm struct {
	Name  string `form:"name"`
	Email string `form:"email"`
}

type roleSettingsForm struct {
	Name        string   `form:"name"`
	Scope       string   `form:"scope"`
	Label       string   `form:"label"`
	Permissions []string `form:"permissions"`
}

func applicationPermissionOptions() []permissionOption {
	return []permissionOption{{"gardens:create", "Gärten anlegen"}, {"global_species:write", "Globale Pflanzen verwalten"}, {"users:manage", "Nutzerrollen verwalten"}, {"application_settings:write", "Instanzeinstellungen verwalten"}, {"roles:manage", "Rollen verwalten"}}
}

func gardenPermissionOptions() []permissionOption {
	return []permissionOption{
		{"garden:read", "Garten sehen"}, {"garden:update", "Garten bearbeiten"}, {"garden:delete", "Garten löschen"}, {"members:write", "Mitglieder verwalten"}, {"species:write", "Pflanzenarten verwalten"}, {"content:write", "Tagebuch und Zuordnungen bearbeiten"},
		{"plants:create", "Pflanzen anlegen"}, {"plants:read:own", "Eigene Pflanzen sehen"}, {"plants:read:other", "Andere Pflanzen sehen"}, {"plants:update:own", "Eigene Pflanzen bearbeiten"}, {"plants:update:other", "Andere Pflanzen bearbeiten"}, {"plants:delete:own", "Eigene Pflanzen löschen"}, {"plants:delete:other", "Andere Pflanzen löschen"},
		{"locations:create", "Orte anlegen"}, {"locations:read:own", "Eigene Orte sehen"}, {"locations:read:other", "Andere Orte sehen"}, {"locations:update:own", "Eigene Orte bearbeiten"}, {"locations:update:other", "Andere Orte bearbeiten"}, {"locations:delete:own", "Eigene Orte löschen"}, {"locations:delete:other", "Andere Orte löschen"},
		{"tasks:create", "Aufgaben anlegen"}, {"tasks:read:own", "Eigene Aufgaben sehen"}, {"tasks:read:other", "Andere Aufgaben sehen"}, {"tasks:update:own", "Eigene Aufgaben bearbeiten"}, {"tasks:update:other", "Andere Aufgaben bearbeiten"}, {"tasks:delete:own", "Eigene Aufgaben löschen"}, {"tasks:delete:other", "Andere Aufgaben löschen"}, {"tasks:complete:own", "Eigene Aufgaben erledigen"}, {"tasks:complete:other", "Andere Aufgaben erledigen"},
	}
}

type adminSpeciesCategoryForm struct {
	Name      string `form:"name"`
	SortOrder int    `form:"sort_order"`
	Active    bool   `form:"active"`
	Lifecycle string `form:"lifecycle"`
}

type adminTaskPriorityForm struct {
	Name      string `form:"name"`
	Value     int    `form:"value"`
	SortOrder int    `form:"sort_order"`
	Active    bool   `form:"active"`
}

type adminApplicationSettingsForm struct {
	LifecycleStatusEnabled bool   `form:"lifecycle_status_enabled"`
	LifecycleRemovalMonth  int    `form:"lifecycle_removal_month"`
	LifecycleRemovalDay    int    `form:"lifecycle_removal_day"`
	Timezone               string `form:"timezone"`
}

type adminTestMailForm struct {
	Email string `form:"email"`
}

func (app *application) requireAdmin(next http.Handler) http.Handler {
	return app.requireActivatedUser(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		user, ok := userFromContext(r.Context())
		if !ok || !user.IsAdmin() {
			app.clientError(w, http.StatusForbidden)
			return
		}
		next.ServeHTTP(w, r)
	}))
}

func (app *application) requireApplicationPermission(permission string, next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		user, ok := userFromContext(r.Context())
		if !ok || !user.Can(permission) {
			app.clientError(w, http.StatusForbidden)
			return
		}
		next.ServeHTTP(w, r)
	})
}

func (app *application) admin(w http.ResponseWriter, r *http.Request) {
	apiClient := client.FromContext(r.Context())
	users, _, err := apiClient.AdminUsers(r.Context())
	if err != nil {
		app.handleAPIError(w, r, err)
		return
	}
	categories, _, err := client.FromContext(r.Context()).AdminSpeciesCategories(r.Context())
	if err != nil {
		app.handleAPIError(w, r, err)
		return
	}
	priorities, _, err := client.FromContext(r.Context()).AdminTaskPriorities(r.Context())
	if err != nil {
		app.handleAPIError(w, r, err)
		return
	}
	settings, _, err := client.FromContext(r.Context()).AdminApplicationSettings(r.Context())
	if err != nil {
		app.handleAPIError(w, r, err)
		return
	}
	environmentVariables, _, err := apiClient.AdminEnvironment(r.Context())
	if err != nil {
		app.handleAPIError(w, r, err)
		return
	}
	applicationRoles, gardenRoles, _, err := apiClient.AdminRoles(r.Context())
	if err != nil {
		app.handleAPIError(w, r, err)
		return
	}
	data := app.newTemplateData(r)
	if !app.loadOptionalGarden(w, r, data) {
		return
	}
	data.AdminUsers, data.SpeciesCategories, data.TaskPriorities = users, categories, priorities
	data.ApplicationRoles, data.GardenRoles = applicationRoles, gardenRoles
	data.ApplicationPermissions, data.GardenPermissions = applicationPermissionOptions(), gardenPermissionOptions()
	data.RoleEditors = []roleEditorData{
		globalRoleEditor("roles-settings", "Instanzrollen", "Diese Rollen gelten für die gesamte Serverinstanz.", "application", applicationRoles, data.ApplicationPermissions, data.CSRFToken),
		globalRoleEditor("garden-role-templates", "Gartenrollen", "Diese Vorlagen gelten in allen Gärten und können je Garten überschrieben werden.", "garden", gardenRoles, data.GardenPermissions, data.CSRFToken),
	}
	for i := range data.RoleEditors {
		data.RoleEditors[i].Garden = data.Garden
	}
	data.ApplicationSettings = &settings
	data.EnvironmentVariables = append(environmentVariables, app.webEnvironmentVariables()...)
	if r.URL.Query().Get("test-mail") == "sent" {
		data.Flash = "Die Testmail wurde versendet."
	}
	if r.URL.Query().Get("test-mail") == "invalid" {
		data.Flash = "Bitte gib eine gültige Empfängeradresse für die Testmail ein."
	}
	if r.URL.Query().Get("invitation") == "sent" {
		data.Flash = "Die Einladung wurde versendet."
	}
	if r.URL.Query().Get("invitation") == "duplicate" {
		data.Flash = "Für diese E-Mail-Adresse existiert bereits ein aktiver Account."
	}
	if r.URL.Query().Get("invitation") == "invalid" {
		data.Flash = "Die Einladung ist ungültig. Bitte prüfe Name und E-Mail-Adresse."
	}
	if r.URL.Query().Get("deletion") == "done" {
		data.Flash = "Der Nutzer wurde gelöscht und seine Kontodaten wurden anonymisiert."
	}
	if r.URL.Query().Get("deletion") == "owner" {
		data.Flash = "Der Nutzer besitzt noch mindestens einen Garten. Übertrage zuerst das Eigentum."
	}
	app.render(w, http.StatusOK, "admin.tmpl", data)
}

func (app *application) adminUserInvitePost(w http.ResponseWriter, r *http.Request) {
	var form adminUserInviteForm
	if err := app.decodePostForm(r, &form); err != nil {
		app.clientError(w, http.StatusBadRequest)
		return
	}
	input := client.AdminUserInviteInput{Name: strings.TrimSpace(form.Name), Email: strings.TrimSpace(form.Email)}
	if _, _, err := client.FromContext(r.Context()).InviteAdminUser(r.Context(), input); err != nil {
		var apiError *client.APIError
		if errors.As(err, &apiError) && apiError.StatusCode == http.StatusUnprocessableEntity {
			status := "invalid"
			if apiError.Validation["email"] == "a user with this email address already exists" {
				status = "duplicate"
			}
			http.Redirect(w, r, adminPath(r, "#users-settings", "invitation", status), http.StatusSeeOther)
			return
		}
		app.handleAPIError(w, r, err)
		return
	}
	http.Redirect(w, r, adminPath(r, "#users-settings", "invitation", "sent"), http.StatusSeeOther)
}

func (app *application) adminUserDeletePost(w http.ResponseWriter, r *http.Request) {
	userID, err := app.readPathID(r, "userID")
	if err != nil {
		app.notFound(w)
		return
	}
	if _, err = client.FromContext(r.Context()).DeleteAdminUser(r.Context(), userID); err != nil {
		var apiError *client.APIError
		if errors.As(err, &apiError) && apiError.StatusCode == http.StatusConflict {
			http.Redirect(w, r, adminPath(r, "#users-settings", "deletion", "owner"), http.StatusSeeOther)
			return
		}
		app.handleAPIError(w, r, err)
		return
	}
	http.Redirect(w, r, adminPath(r, "#users-settings", "deletion", "done"), http.StatusSeeOther)
}

func (app *application) webEnvironmentVariables() []client.EnvironmentVariable {
	return []client.EnvironmentVariable{
		{Component: "Web", Name: "GARDOMATIC_ENV", Value: app.config.Env},
		{Component: "Web", Name: "GARDOMATIC_WEB_HOST", Value: app.config.Host},
		{Component: "Web", Name: "GARDOMATIC_WEB_PORT", Value: fmt.Sprint(app.config.Port)},
		{Component: "Web", Name: "GARDOMATIC_API_BASE_URL", Value: app.config.APIBaseURL},
		{Component: "Web", Name: "GARDOMATIC_DEMO_ACCOUNT_EMAIL", Value: app.config.DemoAccountEmail},
		{Component: "Web", Name: "GARDOMATIC_SESSION_COOKIE_NAME", Value: app.config.SessionCookieName},
		{Component: "Web", Name: "GARDOMATIC_COOKIE_SECURE", Value: fmt.Sprint(app.config.CookieSecure)},
	}
}

func (app *application) adminRoleCreatePost(w http.ResponseWriter, r *http.Request) {
	var form roleSettingsForm
	if err := app.decodePostForm(r, &form); err != nil {
		app.clientError(w, http.StatusBadRequest)
		return
	}
	_, _, err := client.FromContext(r.Context()).CreateAdminRole(r.Context(), client.RoleInput{Name: strings.TrimSpace(form.Name), Scope: form.Scope, Label: strings.TrimSpace(form.Label), Permissions: form.Permissions})
	if err != nil {
		app.handleAPIError(w, r, err)
		return
	}
	http.Redirect(w, r, adminPath(r, adminRoleEditorAnchor(form.Scope)), http.StatusSeeOther)
}

func (app *application) adminRoleUpdatePost(w http.ResponseWriter, r *http.Request) {
	var form roleSettingsForm
	if err := app.decodePostForm(r, &form); err != nil {
		app.clientError(w, http.StatusBadRequest)
		return
	}
	_, _, err := client.FromContext(r.Context()).UpdateAdminRole(r.Context(), form.Name, client.RoleInput{Label: strings.TrimSpace(form.Label), Permissions: form.Permissions})
	if err != nil {
		app.handleAPIError(w, r, err)
		return
	}
	http.Redirect(w, r, adminPath(r, adminRoleEditorAnchor(form.Scope)), http.StatusSeeOther)
}

func (app *application) adminRoleDeletePost(w http.ResponseWriter, r *http.Request) {
	var form roleSettingsForm
	if err := app.decodePostForm(r, &form); err != nil {
		app.clientError(w, http.StatusBadRequest)
		return
	}
	if _, err := client.FromContext(r.Context()).DeleteAdminRole(r.Context(), form.Name); err != nil {
		app.handleAPIError(w, r, err)
		return
	}
	http.Redirect(w, r, adminPath(r, adminRoleEditorAnchor(form.Scope)), http.StatusSeeOther)
}

func adminRoleEditorAnchor(scope string) string {
	if scope == "garden" {
		return "#garden-role-templates"
	}
	return "#roles-settings"
}

func (app *application) adminApplicationSettingsPost(w http.ResponseWriter, r *http.Request) {
	var form adminApplicationSettingsForm
	if err := app.decodePostForm(r, &form); err != nil {
		app.clientError(w, http.StatusBadRequest)
		return
	}
	timezone := strings.TrimSpace(form.Timezone)
	input := client.ApplicationSettingsInput{
		LifecycleStatusEnabled: &form.LifecycleStatusEnabled,
		LifecycleRemovalMonth:  &form.LifecycleRemovalMonth,
		LifecycleRemovalDay:    &form.LifecycleRemovalDay,
		Timezone:               &timezone,
	}
	if _, _, err := client.FromContext(r.Context()).UpdateAdminApplicationSettings(r.Context(), input); err != nil {
		app.handleAPIError(w, r, err)
		return
	}
	http.Redirect(w, r, adminPath(r, "#lifecycle-settings"), http.StatusSeeOther)
}

func (app *application) adminTestMailPost(w http.ResponseWriter, r *http.Request) {
	var form adminTestMailForm
	if err := app.decodePostForm(r, &form); err != nil {
		app.clientError(w, http.StatusBadRequest)
		return
	}
	if _, err := client.FromContext(r.Context()).SendAdminTestMail(r.Context(), strings.TrimSpace(form.Email)); err != nil {
		var apiError *client.APIError
		if errors.As(err, &apiError) && apiError.StatusCode == http.StatusUnprocessableEntity {
			http.Redirect(w, r, adminPath(r, "#mail-settings", "test-mail", "invalid"), http.StatusSeeOther)
			return
		}
		app.handleAPIError(w, r, err)
		return
	}
	http.Redirect(w, r, adminPath(r, "#mail-settings", "test-mail", "sent"), http.StatusSeeOther)
}

func (app *application) adminTaskPriorityCreatePost(w http.ResponseWriter, r *http.Request) {
	var form adminTaskPriorityForm
	if err := app.decodePostForm(r, &form); err != nil {
		app.clientError(w, http.StatusBadRequest)
		return
	}
	name, active := strings.TrimSpace(form.Name), true
	if _, _, err := client.FromContext(r.Context()).CreateAdminTaskPriority(r.Context(), client.TaskPriorityInput{Name: &name, Value: &form.Value, SortOrder: &form.SortOrder, Active: &active}); err != nil {
		app.handleAPIError(w, r, err)
		return
	}
	http.Redirect(w, r, adminPath(r, "#task-priorities"), http.StatusSeeOther)
}

func (app *application) adminTaskPriorityUpdatePost(w http.ResponseWriter, r *http.Request) {
	id, err := app.readPathID(r, "priorityID")
	if err != nil {
		app.notFound(w)
		return
	}
	var form adminTaskPriorityForm
	if err := app.decodePostForm(r, &form); err != nil {
		app.clientError(w, http.StatusBadRequest)
		return
	}
	name := strings.TrimSpace(form.Name)
	if _, _, err := client.FromContext(r.Context()).UpdateAdminTaskPriority(r.Context(), id, client.TaskPriorityInput{Name: &name, Value: &form.Value, SortOrder: &form.SortOrder, Active: &form.Active}); err != nil {
		app.handleAPIError(w, r, err)
		return
	}
	http.Redirect(w, r, adminPath(r, "#task-priorities"), http.StatusSeeOther)
}

func (app *application) adminTaskPriorityDeletePost(w http.ResponseWriter, r *http.Request) {
	id, err := app.readPathID(r, "priorityID")
	if err != nil {
		app.notFound(w)
		return
	}
	if _, err := client.FromContext(r.Context()).DeleteAdminTaskPriority(r.Context(), id); err != nil {
		app.handleAPIError(w, r, err)
		return
	}
	http.Redirect(w, r, adminPath(r, "#task-priorities"), http.StatusSeeOther)
}

func (app *application) adminSpeciesCategoryCreatePost(w http.ResponseWriter, r *http.Request) {
	var form adminSpeciesCategoryForm
	if err := app.decodePostForm(r, &form); err != nil {
		app.clientError(w, http.StatusBadRequest)
		return
	}
	name, active := strings.TrimSpace(form.Name), true
	input := client.SpeciesCategoryInput{Name: &name, SortOrder: &form.SortOrder, Active: &active, Lifecycle: &form.Lifecycle}
	if _, _, err := client.FromContext(r.Context()).CreateAdminSpeciesCategory(r.Context(), input); err != nil {
		app.handleAPIError(w, r, err)
		return
	}
	http.Redirect(w, r, adminPath(r, "#species-categories"), http.StatusSeeOther)
}

func (app *application) adminSpeciesCategoryUpdatePost(w http.ResponseWriter, r *http.Request) {
	categoryID, err := app.readPathID(r, "categoryID")
	if err != nil {
		app.notFound(w)
		return
	}
	var form adminSpeciesCategoryForm
	if err := app.decodePostForm(r, &form); err != nil {
		app.clientError(w, http.StatusBadRequest)
		return
	}
	name := strings.TrimSpace(form.Name)
	input := client.SpeciesCategoryInput{Name: &name, SortOrder: &form.SortOrder, Active: &form.Active, Lifecycle: &form.Lifecycle}
	if _, _, err := client.FromContext(r.Context()).UpdateAdminSpeciesCategory(r.Context(), categoryID, input); err != nil {
		app.handleAPIError(w, r, err)
		return
	}
	http.Redirect(w, r, adminPath(r, "#species-categories"), http.StatusSeeOther)
}

func (app *application) adminSpeciesCategoryDeletePost(w http.ResponseWriter, r *http.Request) {
	categoryID, err := app.readPathID(r, "categoryID")
	if err != nil {
		app.notFound(w)
		return
	}
	if _, err := client.FromContext(r.Context()).DeleteAdminSpeciesCategory(r.Context(), categoryID); err != nil {
		app.handleAPIError(w, r, err)
		return
	}
	http.Redirect(w, r, adminPath(r, "#species-categories"), http.StatusSeeOther)
}

func (app *application) adminUserRolePost(w http.ResponseWriter, r *http.Request) {
	userID, err := app.readPathID(r, "userID")
	if err != nil {
		app.notFound(w)
		return
	}
	var form adminRoleForm
	if err := app.decodePostForm(r, &form); err != nil {
		app.clientError(w, http.StatusBadRequest)
		return
	}
	if _, _, err := client.FromContext(r.Context()).UpdateAdminUserRole(r.Context(), userID, form.Role); err != nil {
		app.handleAPIError(w, r, err)
		return
	}
	http.Redirect(w, r, adminPath(r, ""), http.StatusSeeOther)
}

func (app *application) settings(w http.ResponseWriter, r *http.Request) {
	data := app.newTemplateData(r)
	if !app.loadOptionalGarden(w, r, data) {
		return
	}
	app.render(w, http.StatusOK, "settings.tmpl", data)
}