package oss

import (
	"bytes"
	"io"
	"net/http"
	"testing"
	"time"

	aliyunoss "github.com/aliyun/aliyun-oss-go-sdk/oss"

	"github.com/tinode/chat/server/store"
	"github.com/tinode/chat/server/store/types"
)

type fakeThirdPartyConfig map[string]string

func (f fakeThirdPartyConfig) Get(group string, keys ...string) (map[string]string, error) {
	result := map[string]string{}
	for _, key := range keys {
		if value, ok := f[key]; ok {
			result[key] = value
		}
	}
	return result, nil
}

func TestTenantObjectKey(t *testing.T) {
	got, err := tenantObjectKey(types.TenantID(42), "abc123", time.Date(2026, 8, 11, 9, 0, 0, 0, time.UTC))
	if err != nil {
		t.Fatalf("tenantObjectKey failed: %v", err)
	}
	if want := "tenants/42/2026/08/abc123"; got != want {
		t.Fatalf("tenantObjectKey = %q, want %q", got, want)
	}
}

func TestTenantObjectKeyRejectsZeroTenant(t *testing.T) {
	if _, err := tenantObjectKey(types.ZeroTenantID, "abc123", time.Time{}); err != types.ErrMalformed {
		t.Fatalf("tenantObjectKey err = %v, want malformed", err)
	}
}

func TestGetIdFromUrl(t *testing.T) {
	handler := ossHandler{conf: ossConfig{ServeURL: "/v0/file/s/"}}

	fid := types.Uid(123456)
	got := handler.GetIdFromUrl("/v0/file/s/" + fid.String() + ".jpg")
	if got != fid {
		t.Fatalf("GetIdFromUrl = %v, want %v", got, fid)
	}
}

func TestIsOSSObjectNotFound(t *testing.T) {
	if !isOSSObjectNotFound(aliyunoss.ServiceError{StatusCode: http.StatusNotFound, Code: "NoSuchKey"}) {
		t.Fatal("NoSuchKey should be treated as missing object")
	}
	if isOSSObjectNotFound(aliyunoss.ServiceError{StatusCode: http.StatusForbidden, Code: "AccessDenied"}) {
		t.Fatal("AccessDenied must not be treated as missing object")
	}
}

func TestOSSReadSeekCloser(t *testing.T) {
	data := []byte("0123456789")
	reader := &ossReadSeekCloser{
		size: int64(len(data)),
		open: func(offset int64) (io.ReadCloser, error) {
			return io.NopCloser(bytes.NewReader(data[offset:])), nil
		},
	}
	defer reader.Close()

	buf := make([]byte, 3)
	if n, err := reader.Read(buf); err != nil || n != 3 || string(buf) != "012" {
		t.Fatalf("initial read = %q, %d, %v", buf, n, err)
	}
	if pos, err := reader.Seek(-2, io.SeekEnd); err != nil || pos != 8 {
		t.Fatalf("seek end = %d, %v", pos, err)
	}
	if n, err := reader.Read(buf); err != nil && err != io.EOF || n != 2 || string(buf[:n]) != "89" {
		t.Fatalf("ranged read = %q, %d, %v", buf[:n], n, err)
	}
	if pos, err := reader.Seek(4, io.SeekStart); err != nil || pos != 4 {
		t.Fatalf("seek start = %d, %v", pos, err)
	}
	if n, err := reader.Read(buf[:2]); err != nil || n != 2 || string(buf[:2]) != "45" {
		t.Fatalf("second ranged read = %q, %d, %v", buf[:2], n, err)
	}
}

func TestLoadSysConfig(t *testing.T) {
	original := store.ThirdPartyConfig
	store.ThirdPartyConfig = fakeThirdPartyConfig{
		"oss_enabled":           "1",
		"oss_provider":          "oss",
		"oss_endpoint":          "oss-cn-shenzhen.aliyuncs.com",
		"oss_bucket":            "im-files",
		"oss_region_id":         "cn-shenzhen",
		"oss_access_key_id":     "ak",
		"oss_access_key_secret": "sk",
		"oss_presign_ttl":       "300",
		"oss_serve_url":         "/files/",
		"oss_cache_control":     "private",
		"oss_cors_origins":      `["https://example.com"]`,
		"oss_verify_bucket":     "true",
	}
	defer func() { store.ThirdPartyConfig = original }()

	handler := ossHandler{conf: ossConfig{UseSysConfig: true}}
	if err := handler.loadSysConfig(); err != nil {
		t.Fatalf("loadSysConfig failed: %v", err)
	}
	if handler.conf.Endpoint != "oss-cn-shenzhen.aliyuncs.com" || handler.conf.BucketName != "im-files" {
		t.Fatalf("unexpected OSS config: %+v", handler.conf)
	}
	if handler.conf.RegionID != "cn-shenzhen" || handler.conf.PresignTTL != 300 {
		t.Fatalf("unexpected OSS region or ttl: %+v", handler.conf)
	}
	if handler.conf.ServeURL != "/files/" || handler.conf.CacheControl != "private" || !handler.conf.VerifyBucket {
		t.Fatalf("unexpected OSS serve settings: %+v", handler.conf)
	}
	if len(handler.conf.CorsOrigins) != 1 || handler.conf.CorsOrigins[0] != "https://example.com" {
		t.Fatalf("unexpected OSS cors origins: %+v", handler.conf.CorsOrigins)
	}
}