package main

import (
	"path/filepath"
	"strconv"
	"strings"

	amodels "github.com/abhinavxd/libredesk/internal/auth/models"
	"github.com/abhinavxd/libredesk/internal/envelope"
	"github.com/abhinavxd/libredesk/internal/stringutil"
	"github.com/abhinavxd/libredesk/internal/user/models"
	"github.com/valyala/fasthttp"
	"github.com/volatiletech/null/v9"
	"github.com/zerodha/fastglue"
)

type createContactNoteReq struct {
	Note string `json:"note"`
}

type blockContactReq struct {
	Enabled bool `json:"enabled"`
}

// handleGetContacts returns a list of contacts from the database.
func handleGetContacts(r *fastglue.Request) error {
	var (
		app         = r.Context.(*App)
		order       = string(r.RequestCtx.QueryArgs().Peek("order"))
		orderBy     = string(r.RequestCtx.QueryArgs().Peek("order_by"))
		filters     = string(r.RequestCtx.QueryArgs().Peek("filters"))
		page, _     = strconv.Atoi(string(r.RequestCtx.QueryArgs().Peek("page")))
		pageSize, _ = strconv.Atoi(string(r.RequestCtx.QueryArgs().Peek("page_size")))
		total       = 0
	)
	contacts, err := app.user.GetContacts(page, pageSize, order, orderBy, filters)
	if err != nil {
		return sendErrorEnvelope(r, err)
	}
	if len(contacts) > 0 {
		total = contacts[0].Total
	}
	return r.SendEnvelope(envelope.PageResults{
		Results:    contacts,
		Total:      total,
		PerPage:    pageSize,
		TotalPages: (total + pageSize - 1) / pageSize,
		Page:       page,
	})
}

// handleGetTags returns a contact from the database.
func handleGetContact(r *fastglue.Request) error {
	var (
		app   = r.Context.(*App)
		id, _ = strconv.Atoi(r.RequestCtx.UserValue("id").(string))
	)
	if id <= 0 {
		return r.SendErrorEnvelope(fasthttp.StatusBadRequest, app.i18n.Ts("globals.messages.invalid", "name", "`id`"), nil, envelope.InputError)
	}
	c, err := app.user.GetContact(id, "")
	if err != nil {
		return sendErrorEnvelope(r, err)
	}
	return r.SendEnvelope(c)
}

// handleUpdateContact updates a contact in the database.
func handleUpdateContact(r *fastglue.Request) error {
	var (
		app   = r.Context.(*App)
		id, _ = strconv.Atoi(r.RequestCtx.UserValue("id").(string))
	)
	if id <= 0 {
		return r.SendErrorEnvelope(fasthttp.StatusBadRequest, app.i18n.Ts("globals.messages.invalid", "name", "`id`"), nil, envelope.InputError)
	}

	contact, err := app.user.GetContact(id, "")
	if err != nil {
		return sendErrorEnvelope(r, err)
	}

	form, err := r.RequestCtx.MultipartForm()
	if err != nil {
		app.lo.Error("error parsing form data", "error", err)
		return r.SendErrorEnvelope(fasthttp.StatusInternalServerError, app.i18n.Ts("globals.messages.errorParsing", "name", "{globals.terms.request}"), nil, envelope.GeneralError)
	}

	// Parse form data
	firstName := ""
	if v, ok := form.Value["first_name"]; ok && len(v) > 0 {
		firstName = string(v[0])
	}
	lastName := ""
	if v, ok := form.Value["last_name"]; ok && len(v) > 0 {
		lastName = string(v[0])
	}
	email := ""
	if v, ok := form.Value["email"]; ok && len(v) > 0 {
		email = strings.TrimSpace(string(v[0]))
	}
	phoneNumber := ""
	if v, ok := form.Value["phone_number"]; ok && len(v) > 0 {
		phoneNumber = string(v[0])
	}
	phoneNumberCountryCode := ""
	if v, ok := form.Value["phone_number_country_code"]; ok && len(v) > 0 {
		phoneNumberCountryCode = string(v[0])
	}
	avatarURL := ""
	if v, ok := form.Value["avatar_url"]; ok && len(v) > 0 {
		avatarURL = string(v[0])
	}

	// Set nulls to empty strings.
	if avatarURL == "null" {
		avatarURL = ""
	}
	if phoneNumberCountryCode == "null" {
		phoneNumberCountryCode = ""
	}
	if phoneNumber == "null" {
		phoneNumber = ""
	}

	// Validate mandatory fields.
	if email == "" {
		return r.SendErrorEnvelope(fasthttp.StatusBadRequest, app.i18n.Ts("globals.messages.empty", "name", "email"), nil, envelope.InputError)
	}
	if !stringutil.ValidEmail(email) {
		return r.SendErrorEnvelope(fasthttp.StatusBadRequest, app.i18n.Ts("globals.messages.invalid", "name", "email"), nil, envelope.InputError)
	}
	if firstName == "" {
		return r.SendErrorEnvelope(fasthttp.StatusBadRequest, app.i18n.Ts("globals.messages.empty", "name", "first_name"), nil, envelope.InputError)
	}

	// Another contact with same new email?
	existingContact, _ := app.user.GetContact(0, email)
	if existingContact.ID > 0 && existingContact.ID != id {
		return r.SendErrorEnvelope(fasthttp.StatusBadRequest, app.i18n.T("contact.alreadyExistsWithEmail"), nil, envelope.InputError)
	}

	contactToUpdate := models.User{
		FirstName:              firstName,
		LastName:               lastName,
		Email:                  null.StringFrom(email),
		AvatarURL:              null.NewString(avatarURL, avatarURL != ""),
		PhoneNumber:            null.NewString(phoneNumber, phoneNumber != ""),
		PhoneNumberCountryCode: null.NewString(phoneNumberCountryCode, phoneNumberCountryCode != ""),
	}

	if err := app.user.UpdateContact(id, contactToUpdate); err != nil {
		return sendErrorEnvelope(r, err)
	}

	// Delete avatar?
	if avatarURL == "" && contact.AvatarURL.Valid {
		fileName := filepath.Base(contact.AvatarURL.String)
		app.media.Delete(fileName)
		contact.AvatarURL.Valid = false
		contact.AvatarURL.String = ""
	}

	// Upload avatar?
	files, ok := form.File["files"]
	if ok && len(files) > 0 {
		if err := uploadUserAvatar(r, contact, files); err != nil {
			return sendErrorEnvelope(r, err)
		}
	}

	// Refetch contact and return it
	contact, err = app.user.GetContact(id, "")
	if err != nil {
		return sendErrorEnvelope(r, err)
	}
	return r.SendEnvelope(contact)
}

// handleGetContactNotes returns all notes for a contact.
func handleGetContactNotes(r *fastglue.Request) error {
	var (
		app          = r.Context.(*App)
		contactID, _ = strconv.Atoi(r.RequestCtx.UserValue("id").(string))
	)
	if contactID <= 0 {
		return r.SendErrorEnvelope(fasthttp.StatusBadRequest, app.i18n.Ts("globals.messages.invalid", "name", "`id`"), nil, envelope.InputError)
	}
	notes, err := app.user.GetNotes(contactID)
	if err != nil {
		return sendErrorEnvelope(r, err)
	}
	return r.SendEnvelope(notes)
}

// handleCreateContactNote creates a note for a contact.
func handleCreateContactNote(r *fastglue.Request) error {
	var (
		app          = r.Context.(*App)
		contactID, _ = strconv.Atoi(r.RequestCtx.UserValue("id").(string))
		auser        = r.RequestCtx.UserValue("user").(amodels.User)
		req          = createContactNoteReq{}
	)
	if err := r.Decode(&req, "json"); err != nil {
		return sendErrorEnvelope(r, envelope.NewError(envelope.InputError, app.i18n.Ts("globals.messages.errorParsing", "name", "{globals.terms.request}"), nil))
	}
	if len(req.Note) == 0 {
		return r.SendErrorEnvelope(fasthttp.StatusBadRequest, app.i18n.Ts("globals.messages.empty", "name", "note"), nil, envelope.InputError)
	}
	n, err := app.user.CreateNote(contactID, auser.ID, req.Note)
	if err != nil {
		return sendErrorEnvelope(r, err)
	}
	n, err = app.user.GetNote(n.ID)
	if err != nil {
		return sendErrorEnvelope(r, err)
	}
	return r.SendEnvelope(n)
}

// handleDeleteContactNote deletes a note for a contact.
func handleDeleteContactNote(r *fastglue.Request) error {
	var (
		app          = r.Context.(*App)
		contactID, _ = strconv.Atoi(r.RequestCtx.UserValue("id").(string))
		noteID, _    = strconv.Atoi(r.RequestCtx.UserValue("note_id").(string))
		auser        = r.RequestCtx.UserValue("user").(amodels.User)
	)
	if contactID <= 0 {
		return r.SendErrorEnvelope(fasthttp.StatusBadRequest, app.i18n.Ts("globals.messages.invalid", "name", "`id`"), nil, envelope.InputError)
	}
	if noteID <= 0 {
		return r.SendErrorEnvelope(fasthttp.StatusBadRequest, app.i18n.Ts("globals.messages.invalid", "name", "`note_id`"), nil, envelope.InputError)
	}

	agent, err := app.user.GetAgent(auser.ID, "")
	if err != nil {
		return sendErrorEnvelope(r, err)
	}

	// Allow deletion of only own notes and not those created by others, but also allow `Admin` to delete any note.
	if !agent.HasAdminRole() {
		note, err := app.user.GetNote(noteID)
		if err != nil {
			return sendErrorEnvelope(r, err)
		}
		if note.UserID != auser.ID {
			return r.SendErrorEnvelope(fasthttp.StatusForbidden, app.i18n.Ts("globals.messages.canOnlyDeleteOwn", "name", "{globals.terms.note}"), nil, envelope.InputError)
		}
	}

	app.lo.Info("deleting contact note", "note_id", noteID, "contact_id", contactID, "actor_id", auser.ID)

	if err := app.user.DeleteNote(noteID, contactID); err != nil {
		return sendErrorEnvelope(r, err)
	}
	return r.SendEnvelope(true)
}

// handleBlockContact blocks a contact.
func handleBlockContact(r *fastglue.Request) error {
	var (
		app          = r.Context.(*App)
		contactID, _ = strconv.Atoi(r.RequestCtx.UserValue("id").(string))
		auser        = r.RequestCtx.UserValue("user").(amodels.User)
		req          = blockContactReq{}
	)

	if contactID <= 0 {
		return r.SendErrorEnvelope(fasthttp.StatusBadRequest, app.i18n.Ts("globals.messages.invalid", "name", "`id`"), nil, envelope.InputError)
	}

	if err := r.Decode(&req, "json"); err != nil {
		return sendErrorEnvelope(r, envelope.NewError(envelope.InputError, app.i18n.Ts("globals.messages.errorParsing", "name", "{globals.terms.request}"), nil))
	}

	app.lo.Info("setting contact block status", "contact_id", contactID, "enabled", req.Enabled, "actor_id", auser.ID)

	contact, err := app.user.GetContact(contactID, "")
	if err != nil {
		return sendErrorEnvelope(r, err)
	}

	if err := app.user.ToggleEnabled(contactID, contact.Type, req.Enabled); err != nil {
		return sendErrorEnvelope(r, err)
	}

	contact, err = app.user.GetContact(contactID, "")
	if err != nil {
		return sendErrorEnvelope(r, err)
	}
	return r.SendEnvelope(contact)
}