package e2e

import (
	"bytes"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"testing"

	"proto-gen/internal/api"
	"proto-gen/internal/config"
	"proto-gen/internal/database"
	"proto-gen/internal/gitclient"
	"proto-gen/internal/models"
)

type mockGitClient struct{}

func (m *mockGitClient) ListRepositories(owner string) ([]gitclient.Repository, error) {
	return nil, nil
}
func (m *mockGitClient) CreateRepository(owner, name, desc string, private bool) (*gitclient.Repository, error) {
	return &gitclient.Repository{Name: name}, nil
}
func (m *mockGitClient) GetRepository(owner, name string) (*gitclient.Repository, error) {
	return &gitclient.Repository{Name: name}, nil
}
func (m *mockGitClient) ListBranches(owner, repo string) ([]gitclient.Branch, error) {
	return []gitclient.Branch{{Name: "main", Commit: "abc123"}}, nil
}
func (m *mockGitClient) GetBranch(owner, repo, branch string) (*gitclient.Branch, error) {
	return &gitclient.Branch{Name: branch, Commit: "abc123"}, nil
}

func newTestServer(t *testing.T) (*api.Server, *database.DB) {
	t.Helper()
	db, err := database.New(t.TempDir() + "/test.db")
	if err != nil {
		t.Fatalf("creating db: %v", err)
	}
	t.Cleanup(func() { db.Close() })

	cfg := &config.Config{
		ToolchainRegistry: "registry.example.com/proto-gen",
		TargetRepoTemplate: "{proto_repo}-gen-{lang}",
		Plugins: []config.PluginConfig{
			{Language: "go", Image: "proto-gen-go:v1.0"},
			{Language: "nodejs", Image: "proto-gen-ts:v1.0"},
		},
	}

	return api.NewServer(db, cfg, &mockGitClient{}), db
}

func TestIdempotency(t *testing.T) {
	srv, db := newTestServer(t)

	body, _ := json.Marshal(map[string]string{
		"language":    "go",
		"proto_repo":  "test-owner/yoresee_doc",
		"proto_branch": "main",
	})

	req := httptest.NewRequest("POST", "/api/v1/tasks", bytes.NewReader(body))
	w := httptest.NewRecorder()
	srv.ServeHTTP(w, req)

	if w.Code != http.StatusCreated {
		t.Fatalf("first create: status = %d, want %d", w.Code, http.StatusCreated)
	}

	req = httptest.NewRequest("POST", "/api/v1/tasks", bytes.NewReader(body))
	w = httptest.NewRecorder()
	srv.ServeHTTP(w, req)

	if w.Code != http.StatusCreated {
		t.Fatalf("second create: status = %d, want %d", w.Code, http.StatusCreated)
	}

	tasks, _ := db.ListTasks("", 100, 0)
	goTasks := 0
	for _, task := range tasks {
		if task.Language == "go" {
			goTasks++
		}
	}
	if goTasks != 2 {
		t.Errorf("go tasks = %d, want 2", goTasks)
	}
}

func TestVersionSwitch(t *testing.T) {
	srv, _ := newTestServer(t)

	req := httptest.NewRequest("GET", "/api/v1/plugins/go/versions", nil)
	w := httptest.NewRecorder()
	srv.ServeHTTP(w, req)

	if w.Code != http.StatusOK {
		t.Fatalf("get version: status = %d, want %d", w.Code, http.StatusOK)
	}

	body, _ := json.Marshal(map[string]string{"image": "proto-gen-go:v2.0"})
	req = httptest.NewRequest("PUT", "/api/v1/plugins/go/versions", bytes.NewReader(body))
	w = httptest.NewRecorder()
	srv.ServeHTTP(w, req)

	if w.Code != http.StatusOK {
		t.Fatalf("update version: status = %d, want %d", w.Code, http.StatusOK)
	}

	var plugin config.PluginConfig
	json.NewDecoder(w.Body).Decode(&plugin)
	if plugin.Image != "proto-gen-go:v2.0" {
		t.Errorf("Image = %q, want %q", plugin.Image, "proto-gen-go:v2.0")
	}
}

func TestFailureRecovery(t *testing.T) {
	srv, db := newTestServer(t)

	task := &models.Task{
		ID:             "fail-task-1",
		Status:         models.StatusFailed,
		Language:       "go",
		ProtoRepo:      "test/yoresee_doc",
		ProtoBranch:    "main",
		TargetRepo:     "yoresee_doc-gen-go",
		ToolchainImage: "proto-gen-go:v1.0",
		Error:          "some error",
	}
	db.CreateTask(task)

	body, _ := json.Marshal(map[string]string{})
	req := httptest.NewRequest("POST", "/api/v1/tasks/fail-task-1/retry", bytes.NewReader(body))
	w := httptest.NewRecorder()
	srv.ServeHTTP(w, req)

	if w.Code != http.StatusOK {
		t.Fatalf("retry: status = %d, want %d", w.Code, http.StatusOK)
	}

	var retried models.Task
	json.NewDecoder(w.Body).Decode(&retried)
	if retried.Status != models.StatusPending {
		t.Errorf("Status = %q, want %q", retried.Status, models.StatusPending)
	}
	if retried.Retries != 1 {
		t.Errorf("Retries = %d, want 1", retried.Retries)
	}
}