package server

import (
	"context"
	"net/http"
	"net/url"
	"strings"
	"testing"
)

func TestRulesPageRenders(t *testing.T) {
	srv := newTestServer(t)
	session, _, _ := login(t, srv)

	rec := getWithSession(t, srv, "/rules", session)
	if rec.Code != http.StatusOK {
		t.Fatalf("status = %d, want 200", rec.Code)
	}
	body := rec.Body.String()
	for _, want := range []string{"Rules editor", "Save new version", "Versions", "Back to inbox", "Unsubscribe"} {
		if !strings.Contains(body, want) {
			t.Errorf("rules page missing %q", want)
		}
	}
}

func TestRulesSaveCreatesVersion(t *testing.T) {
	srv := newTestServer(t)
	session, csrfCookie, csrf := login(t, srv)

	rule := `from contains "heritagefruittrees.com.au" => category=Action, importance=high, action=file`
	rec := postForm(t, srv, "/rules/save", session, csrfCookie, url.Values{
		"csrf": {csrf}, "text": {rule},
	})
	if rec.Code != http.StatusSeeOther {
		t.Fatalf("save status = %d, want 303 (body %s)", rec.Code, rec.Body.String())
	}

	text, version, err := srv.store.CurrentRules(context.Background())
	if err != nil {
		t.Fatalf("CurrentRules() error = %v", err)
	}
	if text != rule {
		t.Errorf("CurrentRules() text = %q, want the saved rule", text)
	}
	if version != 2 {
		t.Errorf("CurrentRules() version = %d, want 2", version)
	}

	// The editor shows the new version and active rule count.
	body := getWithSession(t, srv, "/rules", session).Body.String()
	if !strings.Contains(body, "version 2") || !strings.Contains(body, "1 active rule") {
		t.Errorf("rules page did not reflect the saved version; body:\n%s", body)
	}
}

func TestRulesSaveRequiresCSRF(t *testing.T) {
	srv := newTestServer(t)
	session, _, _ := login(t, srv)

	rec := postForm(t, srv, "/rules/save", session, nil, url.Values{"text": {"anything"}})
	if rec.Code != http.StatusForbidden {
		t.Fatalf("status = %d, want 403", rec.Code)
	}
}

func TestRulesPageShowsParseErrors(t *testing.T) {
	srv := newTestServer(t)
	session, csrfCookie, csrf := login(t, srv)

	rec := postForm(t, srv, "/rules/save", session, csrfCookie, url.Values{
		"csrf": {csrf}, "text": {"this line has no arrow"},
	})
	if rec.Code != http.StatusSeeOther {
		t.Fatalf("save status = %d, want 303", rec.Code)
	}
	body := getWithSession(t, srv, "/rules", session).Body.String()
	if !strings.Contains(body, "could not be parsed") || !strings.Contains(body, "missing =>") {
		t.Errorf("rules page did not surface the parse error; body:\n%s", body)
	}
}

func TestRulesRestoreCreatesNewVersion(t *testing.T) {
	srv := newTestServer(t)
	session, csrfCookie, csrf := login(t, srv)
	ctx := context.Background()

	first := `from contains "a" => category=Info`
	second := `from contains "b" => category=Action`
	for _, text := range []string{first, second} {
		rec := postForm(t, srv, "/rules/save", session, csrfCookie, url.Values{"csrf": {csrf}, "text": {text}})
		if rec.Code != http.StatusSeeOther {
			t.Fatalf("save %q status = %d, want 303", text, rec.Code)
		}
	}

	// Restore version 2 (the first saved rule) as a new version.
	rec := postForm(t, srv, "/rules/restore", session, csrfCookie, url.Values{
		"csrf": {csrf}, "version": {"2"},
	})
	if rec.Code != http.StatusSeeOther {
		t.Fatalf("restore status = %d, want 303", rec.Code)
	}
	text, version, err := srv.store.CurrentRules(ctx)
	if err != nil {
		t.Fatalf("CurrentRules() error = %v", err)
	}
	if text != first {
		t.Errorf("restored text = %q, want %q", text, first)
	}
	if version != 4 {
		t.Errorf("restored version = %d, want 4 (append-only)", version)
	}
}

func TestDashboardLinksRulesAndUnsubscribe(t *testing.T) {
	srv := newTestServer(t)
	session, _, _ := login(t, srv)

	body := getWithSession(t, srv, "/", session).Body.String()
	for _, want := range []string{`href="/rules"`, `href="/unsubscribe"`} {
		if !strings.Contains(body, want) {
			t.Errorf("dashboard missing %q", want)
		}
	}
}

func TestRulesCountsLines(t *testing.T) {
	text := "# comment\n\nfrom contains \"a\" => category=Info\nfrom contains \"b\" => category=Action"
	if got := countRuleLines(text); got != 2 {
		t.Errorf("countRuleLines() = %d, want 2", got)
	}
	if got := firstRuleLine(text); got != `from contains "a" => category=Info` {
		t.Errorf("firstRuleLine() = %q", got)
	}
	if got := firstRuleLine("# only a comment"); got != "(comments only)" {
		t.Errorf("firstRuleLine(comment only) = %q", got)
	}
}

func TestRulesReclassifyWithoutJEVRedirects(t *testing.T) {
	srv := newTestServer(t)
	session, csrfCookie, csrf := login(t, srv)

	rec := postForm(t, srv, "/rules/reclassify", session, csrfCookie, url.Values{"csrf": {csrf}})
	if rec.Code != http.StatusSeeOther {
		t.Fatalf("status = %d, want 303 (body %s)", rec.Code, rec.Body.String())
	}
	if loc := rec.Header().Get("Location"); !strings.Contains(loc, "JEV_API_KEY") {
		t.Errorf("Location = %q, want a JEV-not-configured note", loc)
	}
}