package main

// gitlab_extra_test.go — error taxonomy, insecure client seam, decode failures.

import (
	"context"
	"fmt"
	"net/http"
	"net/http/httptest"
	"strconv"
	"strings"
	"testing"
)

func TestGitLabErrorType(t *testing.T) {
	err := &GitLabError{msg: "upstream sad"}
	if err.Error() != "upstream sad" {
		t.Fatalf("GitLabError.Error = %q", err.Error())
	}
}

func TestNewGitLabWithClientInsecure(t *testing.T) {
	store := openTestStore(t)
	gl := NewGitLabWithClient(store, "https://gl.example/", true)
	if !gl.insecure {
		t.Fatal("insecure flag not set")
	}
	hc := gl.httpClient()
	if hc.Transport == nil {
		t.Fatal("insecure client must install a custom transport")
	}
	plain := NewGitLab(store, "https://gl.example/")
	if plain.httpClient().Transport != nil {
		t.Fatal("default client must not override the transport")
	}
	if !strings.HasSuffix(gl.baseURL, "example") || strings.HasSuffix(gl.baseURL, "/") {
		t.Fatalf("baseURL trailing slash not trimmed: %q", gl.baseURL)
	}
}

func TestGitLabConnectDecodeAndEmptyUser(t *testing.T) {
	cases := []struct {
		name string
		body string
		want string
	}{
		{"decode-failure", "not json", "decode"},
		{"empty-login", `{}`, "no login"},
	}
	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			up := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
				_, _ = w.Write([]byte(tc.body))
			}))
			t.Cleanup(up.Close)
			gl := NewGitLab(openTestStore(t), up.URL)
			_, err := gl.Connect(context.Background(), "pat")
			if err == nil || !strings.Contains(err.Error(), tc.want) {
				t.Fatalf("Connect = %v, want containing %q", err, tc.want)
			}
		})
	}
}

func TestGitLabRequestFailures(t *testing.T) {
	store := openTestStore(t)

	// unparseable base URL → request construction error
	gl := NewGitLab(store, "https://gl.example/\n")
	if _, err := gl.Connect(context.Background(), "pat"); err == nil {
		t.Fatal("connect against unparseable URL must fail")
	}

	// transport failure (cancelled context) wraps into GitLabError
	gl2 := NewGitLab(store, "https://gl.example")
	ctx, cancel := context.WithCancel(context.Background())
	cancel()
	_, err := gl2.Connect(ctx, "pat")
	if err == nil || !strings.Contains(err.Error(), "gitlab request failed") {
		t.Fatalf("connect with dead context = %v, want GitLabError", err)
	}

	// store failures surface from token() and Disconnect
	dead := openTestStore(t)
	_ = dead.Close()
	gl3 := NewGitLab(dead, "https://gl.example")
	if _, err := gl3.Repos(context.Background()); err == nil || !strings.Contains(err.Error(), "closed") {
		t.Fatalf("repos with closed store = %v", err)
	}
	if err := gl3.Disconnect(); err == nil {
		t.Fatal("disconnect with closed store must fail")
	}
}

func TestGitLabStatusStoreFailure(t *testing.T) {
	dead := openTestStore(t)
	_ = dead.Close()
	gl := NewGitLab(dead, "https://gl.example")
	status := gl.Status()
	if status["connected"] != false {
		t.Fatalf("status with broken store = %v, want connected=false", status)
	}
}

func TestGitLabConnectStoreFailures(t *testing.T) {
	up := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		_, _ = w.Write([]byte(`{"login":"alice"}`))
	}))
	t.Cleanup(up.Close)
	dead := openTestStore(t)
	_ = dead.Close()
	gl := NewGitLab(dead, up.URL)
	if _, err := gl.Connect(context.Background(), "pat"); err == nil {
		t.Fatal("Connect with closed store must fail at SetSetting")
	}
}

func TestGitLabReposSkipsEmptyPaths(t *testing.T) {
	up := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		_, _ = w.Write([]byte(`[{"full_name":"","name":"X"}]`))
	}))
	t.Cleanup(up.Close)
	store := openTestStore(t)
	gl := NewGitLab(store, up.URL)
	if err := store.SetSetting(settingGitLabToken, "pat"); err != nil {
		t.Fatalf("set token: %v", err)
	}
	repos, err := gl.Repos(context.Background())
	if err != nil {
		t.Fatalf("repos: %v", err)
	}
	if len(repos) != 0 {
		t.Fatalf("repos = %+v, want empty (blank path skipped)", repos)
	}
}

// newPagedGitLab serves full pages until pagesToFull+1, then a short page.
func newPagedGitLab(t *testing.T, alwaysFull bool) *GitLab {
	t.Helper()
	mux := http.NewServeMux()
	mux.HandleFunc("/api/v1/user/repos", func(w http.ResponseWriter, r *http.Request) {
		page, _ := strconv.Atoi(r.URL.Query().Get("page"))
		if page < 1 {
			page = 1
		}
		count := projectsPerPage
		if !alwaysFull && page > 2 {
			count = 1
		}
		var b strings.Builder
		b.WriteString("[")
		for i := 0; i < count; i++ {
			if i > 0 {
				b.WriteString(",")
			}
			fmt.Fprintf(&b, `{"full_name":"team/p%d-%d","name":"P","owner":{"login":"team"},`+
				`"updated_at":"2024-01-01T00:00:00Z","html_url":"https://gl","default_branch":"main"}`, page, i)
		}
		b.WriteString("]")
		w.Header().Set("Content-Type", "application/json")
		_, _ = w.Write([]byte(b.String()))
	})
	up := httptest.NewServer(mux)
	t.Cleanup(up.Close)
	store := openTestStore(t)
	if err := store.SetSetting(settingGitLabToken, "pat"); err != nil {
		t.Fatalf("set token: %v", err)
	}
	return NewGitLab(store, up.URL)
}

func TestGitLabReposPaginatesUntilShortPage(t *testing.T) {
	gl := newPagedGitLab(t, false) // 50 + 50 + 1 (short) → stops after page 3
	repos, err := gl.Repos(context.Background())
	if err != nil {
		t.Fatalf("repos: %v", err)
	}
	if len(repos) != 2*projectsPerPage+1 {
		t.Fatalf("repos = %d, want %d (pages 1-2 full + short page 3)", len(repos), 2*projectsPerPage+1)
	}
	if repos[0].Path != "team/p1-0" || repos[len(repos)-1].Path != "team/p3-0" {
		t.Fatalf("first/last = %q..%q, want page1..page3", repos[0].Path, repos[len(repos)-1].Path)
	}
}

func TestGitLabReposPaginationCapped(t *testing.T) {
	gl := newPagedGitLab(t, true) // upstream always returns full pages
	repos, err := gl.Repos(context.Background())
	if err != nil {
		t.Fatalf("repos: %v", err)
	}
	if len(repos) != maxRepoPages*projectsPerPage {
		t.Fatalf("repos = %d, want capped at %d", len(repos), maxRepoPages*projectsPerPage)
	}
}