package main

import (
	"bytes"
	"net/http"
	"net/http/httptest"
	"os"
	"path/filepath"
	"strings"
	"testing"

	"git.golem15.com/golem15/summercms/bonfire"
)

func TestParityCommands(t *testing.T) {
	names := commandNames()
	for _, want := range []string{"parity:record", "parity:replay"} {
		if !containsName(names, want) {
			t.Fatalf("missing %s in %v", want, names)
		}
	}

	spec := filepath.Join("..", "..", "tide", "testdata", "one-route-spec.yaml")
	outDir := t.TempDir()
	fixture := filepath.Join(outDir, "sample.yaml")

	origJSON := httptest.NewServer(jsonHandler(`{"data":"ok"}`))
	t.Cleanup(origJSON.Close)
	changedJSON := httptest.NewServer(jsonHandler(`{"data":"no"}`))
	t.Cleanup(changedJSON.Close)
	origPlain := httptest.NewServer(plainHandler("hello"))
	t.Cleanup(origPlain.Close)
	changedPlain := httptest.NewServer(plainHandler("hallo"))
	t.Cleanup(changedPlain.Close)

	if err := runParity("parity:record", "--spec", spec, "--target", origJSON.URL, "--output", fixture); err != nil {
		t.Fatalf("record: %v", err)
	}
	raw, err := os.ReadFile(fixture)
	if err != nil {
		t.Fatal(err)
	}
	if !bytes.Contains(raw, []byte(`{"data":"ok"}`)) {
		t.Fatalf("recorded fixture missing body:\n%s", raw)
	}

	if err := runParity("parity:replay", "--fixtures", fixture, "--target", origJSON.URL); err != nil {
		t.Fatalf("replay identical JSON: %v", err)
	}

	err = runParity("parity:replay", "--fixtures", fixture, "--target", changedJSON.URL)
	if err == nil {
		t.Fatal("changed JSON must fail")
	}
	msg := err.Error()
	if !strings.Contains(msg, "$.data") {
		t.Fatalf("JSON mismatch missing $.data: %s", msg)
	}
	if !strings.Contains(msg, "ok") || !strings.Contains(msg, "no") {
		t.Fatalf("JSON mismatch missing expected/actual: %s", msg)
	}

	plainFixture := filepath.Join(outDir, "plain.yaml")
	if err := runParity("parity:record", "--spec", spec, "--target", origPlain.URL, "--output", plainFixture); err != nil {
		t.Fatalf("record plain: %v", err)
	}
	if err := runParity("parity:replay", "--fixtures", plainFixture, "--target", origPlain.URL); err != nil {
		t.Fatalf("replay identical plain: %v", err)
	}
	err = runParity("parity:replay", "--fixtures", plainFixture, "--target", changedPlain.URL)
	if err == nil {
		t.Fatal("changed bytes must fail")
	}
	if !strings.Contains(err.Error(), "1") {
		t.Fatalf("byte mismatch missing offset: %v", err)
	}
}

func commandNames() []string {
	var names []string
	for _, c := range toolCommands() {
		names = append(names, c.Name)
	}
	return names
}

func containsName(names []string, want string) bool {
	for _, name := range names {
		if name == want {
			return true
		}
	}
	return false
}

func runParity(args ...string) error {
	var buf bytes.Buffer
	root, err := bonfire.NewRoot("summer", toolCommands(), &buf)
	if err != nil {
		return err
	}
	root.SetArgs(args)
	return root.Execute()
}

func jsonHandler(body string) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusOK)
		_, _ = w.Write([]byte(body))
	})
}

func plainHandler(body string) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "text/plain")
		w.WriteHeader(http.StatusOK)
		_, _ = w.Write([]byte(body))
	})
}