package gitea

import (
	"context"
	"net/http"
	"net/http/httptest"
	"testing"
	"time"
)

func newTestClient(t *testing.T, h http.Handler) *Client {
	t.Helper()
	srv := httptest.NewServer(h)
	t.Cleanup(srv.Close)
	c := NewClient(srv.URL, "test-token")
	return c
}

func TestListIssuesExcludesPullsAndSendsAuth(t *testing.T) {
	var gotAuth, gotType, gotState, gotSince string
	c := newTestClient(t, http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		gotAuth = r.Header.Get("Authorization")
		gotType = r.URL.Query().Get("type")
		gotState = r.URL.Query().Get("state")
		gotSince = r.URL.Query().Get("since")
		w.Header().Set("Content-Type", "application/json")
		// One real issue and one PR-shaped issue that must be filtered out.
		_, _ = w.Write([]byte(`[
			{"id":1,"number":5,"title":"real issue","user":{"login":"alice"}},
			{"id":2,"number":6,"title":"a pr","user":{"login":"bob"},"pull_request":{"merged":false}}
		]`))
	}))

	since := time.Date(2026, 1, 2, 3, 4, 5, 0, time.UTC)
	issues, err := c.ListIssues(context.Background(), "unkin/teabot", since)
	if err != nil {
		t.Fatalf("ListIssues: %v", err)
	}
	if len(issues) != 1 || issues[0].Index != 5 {
		t.Fatalf("expected 1 non-PR issue #5, got %+v", issues)
	}
	if gotAuth != "token test-token" {
		t.Errorf("Authorization = %q", gotAuth)
	}
	if gotType != "issues" || gotState != "open" {
		t.Errorf("query type=%q state=%q", gotType, gotState)
	}
	if gotSince != "2026-01-02T03:04:05Z" {
		t.Errorf("since = %q", gotSince)
	}
}

func TestListPulls(t *testing.T) {
	c := newTestClient(t, http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.URL.Query().Get("state") != "open" {
			t.Errorf("state = %q", r.URL.Query().Get("state"))
		}
		_, _ = w.Write([]byte(`[{"id":1,"number":7,"title":"add feature","user":{"login":"carol"},"head":{"ref":"benvin/x"},"base":{"ref":"main"}}]`))
	}))
	pulls, err := c.ListPulls(context.Background(), "unkin/teabot")
	if err != nil {
		t.Fatalf("ListPulls: %v", err)
	}
	if len(pulls) != 1 || pulls[0].Index != 7 || pulls[0].Head.Ref != "benvin/x" {
		t.Fatalf("unexpected pulls: %+v", pulls)
	}
}

func TestListComments(t *testing.T) {
	c := newTestClient(t, http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		_, _ = w.Write([]byte(`[{"id":42,"body":"looks good","user":{"login":"dave"},"issue_url":"https://git.unkin.net/api/v1/repos/unkin/teabot/issues/5"}]`))
	}))
	comments, err := c.ListComments(context.Background(), "unkin/teabot", time.Time{})
	if err != nil {
		t.Fatalf("ListComments: %v", err)
	}
	if len(comments) != 1 || comments[0].ID != 42 {
		t.Fatalf("unexpected comments: %+v", comments)
	}
}

func TestGetPullDiff(t *testing.T) {
	c := newTestClient(t, http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.URL.Path != "/api/v1/repos/unkin/teabot/pulls/7.diff" {
			t.Errorf("path = %q", r.URL.Path)
		}
		_, _ = w.Write([]byte("diff --git a/x b/x\n+hello\n"))
	}))
	diff, err := c.GetPullDiff(context.Background(), "unkin/teabot", 7)
	if err != nil {
		t.Fatalf("GetPullDiff: %v", err)
	}
	if diff == "" || diff[:4] != "diff" {
		t.Errorf("unexpected diff: %q", diff)
	}
}

func TestGetErrorsOnNon2xx(t *testing.T) {
	c := newTestClient(t, http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		http.Error(w, "nope", http.StatusForbidden)
	}))
	if _, err := c.ListIssues(context.Background(), "a/b", time.Time{}); err == nil {
		t.Error("expected error on 403")
	}
}

func TestSplitRepoValidation(t *testing.T) {
	c := NewClient("https://example.com", "t")
	if _, err := c.ListIssues(context.Background(), "noslash", time.Time{}); err == nil {
		t.Error("expected error for repo without slash")
	}
}

func TestIssueIndexFromCommentURL(t *testing.T) {
	cases := []struct {
		name    string
		comment Comment
		want    int64
		ok      bool
	}{
		{"issue url", Comment{IssueURL: "https://git.unkin.net/api/v1/repos/unkin/teabot/issues/5"}, 5, true},
		{"pr url", Comment{PRURL: "https://git.unkin.net/api/v1/repos/unkin/teabot/pulls/12"}, 12, true},
		{"trailing slash", Comment{IssueURL: "https://x/issues/8/"}, 8, true},
		{"no url", Comment{}, 0, false},
		{"non-numeric", Comment{IssueURL: "https://x/issues/abc"}, 0, false},
	}
	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			got, ok := IssueIndexFromCommentURL(tc.comment)
			if ok != tc.ok || got != tc.want {
				t.Errorf("got (%d,%v), want (%d,%v)", got, ok, tc.want, tc.ok)
			}
		})
	}
}