package api

import (
	"bytes"
	"context"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"
	"time"

	"git.fabledsword.com/bvandeusen/minstrel/internal/auth"
	"git.fabledsword.com/bvandeusen/minstrel/internal/backup"
	"git.fabledsword.com/bvandeusen/minstrel/internal/dbtest"
)

// A new server takes a backup only with the setup token from its log, only
// while it has no accounts, and only a file that is a backup; then the
// backup's accounts sign in again.
func TestRestore_ANewServerTakesABackupWithTheSetupToken(t *testing.T) {
	h, pool := testHandlers(t)
	ctx := context.Background()
	truncateLibrary(t, pool)
	resetUsers(t, h)
	seedUser(t, pool, "restored", "abcd1234", true)
	c, err := backup.Snapshot(ctx, pool)
	if err != nil {
		t.Fatal(err)
	}
	var file bytes.Buffer
	if _, err := backup.Write(&file, c, time.Now(), "test"); err != nil {
		t.Fatal(err)
	}
	resetUsers(t, h)

	token, err := auth.NewSetupToken()
	if err != nil {
		t.Fatal(err)
	}
	h.setupToken = token
	h.requireSetupToken = true
	restore := func(setupToken string, body []byte) *httptest.ResponseRecorder {
		req := httptest.NewRequest(http.MethodPost, "/api/auth/restore", bytes.NewReader(body))
		req.Header.Set("Content-Type", "application/x-tar")
		if setupToken != "" {
			req.Header.Set(SetupTokenHeader, setupToken)
		}
		rec := httptest.NewRecorder()
		h.handleRestore(rec, req)
		return rec
	}

	if w := restore("", file.Bytes()); w.Code != http.StatusForbidden {
		t.Errorf("no setup token: status = %d, want 403", w.Code)
	}
	if w := restore("wrong", file.Bytes()); w.Code != http.StatusForbidden {
		t.Errorf("a wrong setup token: status = %d, want 403", w.Code)
	}
	if w := restore(token.Value(), []byte("not a tar file")); w.Code != http.StatusBadRequest ||
		!strings.Contains(w.Body.String(), "not_a_backup") {
		t.Errorf("not a backup: status = %d body = %s, want 400 not_a_backup", w.Code, w.Body.String())
	}
	var n int
	if err := pool.QueryRow(ctx, "SELECT count(*) FROM users").Scan(&n); err != nil || n != 0 {
		t.Fatalf("a refused restore left %d accounts (%v)", n, err)
	}

	w := restore(token.Value(), file.Bytes())
	if w.Code != http.StatusOK {
		t.Fatalf("restore: status = %d body = %s", w.Code, w.Body.String())
	}
	var out restoreResp
	if err := json.NewDecoder(w.Body).Decode(&out); err != nil || out.Accounts != 1 {
		t.Errorf("restore answered %+v (%v), want one account", out, err)
	}
	var admin bool
	if err := pool.QueryRow(ctx, "SELECT is_admin FROM users WHERE username = $1",
		dbtest.TestUserPrefix+"restored").Scan(&admin); err != nil || !admin {
		t.Errorf("the restored admin: is_admin = %v, %v", admin, err)
	}

	if w := restore(token.Value(), file.Bytes()); w.Code != http.StatusConflict ||
		!strings.Contains(w.Body.String(), "not_empty") {
		t.Errorf("a second restore: status = %d body = %s, want 409 not_empty", w.Code, w.Body.String())
	}
}