package main

import (
	"bytes"
	"context"
	"encoding/json"
	"fmt"
	"os"
	"os/exec"
	"path/filepath"
	"strings"
	"testing"

	"gitea.maximumdirect.net/eric/ReleaseKit/buildinfo"
	"gitea.maximumdirect.net/eric/ReleaseKit/cmd/releasekit/internal/cli"
)

func TestVersionCommand(t *testing.T) {
	var stdout, stderr bytes.Buffer
	if status := run(context.Background(), []string{"version"}, &stdout, &stderr); status != 0 {
		t.Fatalf("run() status = %d, want 0; stderr = %q", status, stderr.String())
	}
	if want := fmt.Sprintf("releasekit %s\n", buildinfo.Version()); stdout.String() != want {
		t.Fatalf("version output = %q, want %q", stdout.String(), want)
	}
	if stderr.Len() != 0 {
		t.Fatalf("version command wrote to stderr: %q", stderr.String())
	}
}

func TestUnknownCommand(t *testing.T) {
	var stdout, stderr bytes.Buffer
	if status := run(context.Background(), []string{"publish"}, &stdout, &stderr); status != 2 {
		t.Fatalf("run() status = %d, want 2", status)
	}
	if stdout.Len() != 0 {
		t.Fatalf("unknown command wrote to stdout: %q", stdout.String())
	}
	if want := "unknown command \"publish\"\n" + cli.Usage + "\n"; stderr.String() != want {
		t.Fatalf("usage output = %q, want %q", stderr.String(), want)
	}
}

func TestCheckCommandBindsConfiguredChecksToCapturedCandidate(t *testing.T) {
	repository := newCLIRepository(t)
	profilePath := filepath.Join(t.TempDir(), "profile with spaces.json")
	executable, err := os.Executable()
	if err != nil {
		t.Fatal(err)
	}
	settings := cli.Settings{
		Product: "Example Product",
		Remote:  "origin",
		Checks: []cli.CheckCommand{{
			Args: []string{executable, "-test.run=TestCandidateCheckHelper", "--"},
			Env: map[string]string{
				"RELEASEKIT_CHECK_HELPER": "1",
				"RELEASEKIT_VERSION":      "profile version",
				"RELEASEKIT_CANDIDATE":    "profile commit",
			},
		}},
	}
	contents, err := json.Marshal(settings)
	if err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(profilePath, contents, 0o600); err != nil {
		t.Fatal(err)
	}

	var stdout, stderr bytes.Buffer
	args := []string{"check", "--repo", repository, "--config", profilePath, "v1.2.3"}
	if status := run(context.Background(), args, &stdout, &stderr); status != 0 {
		t.Fatalf("run() status = %d; stdout=%q stderr=%q", status, stdout.String(), stderr.String())
	}
	commit := cliGitOutput(t, repository, "rev-parse", "HEAD")
	if want := "v1.2.3|" + commit; stderr.String() != want {
		t.Fatalf("configured check received %q, want captured candidate %q", stderr.String(), want)
	}
	if want := fmt.Sprintf("local candidate v1.2.3 at %s is valid\n", commit); stdout.String() != want {
		t.Fatalf("stdout = %q, want %q", stdout.String(), want)
	}
}

func TestCandidateCheckHelper(t *testing.T) {
	if os.Getenv("RELEASEKIT_CHECK_HELPER") != "1" {
		return
	}
	fmt.Fprintf(os.Stdout, "%s|%s", os.Getenv("RELEASEKIT_VERSION"), os.Getenv("RELEASEKIT_CANDIDATE"))
	os.Exit(0)
}

func newCLIRepository(t *testing.T) string {
	t.Helper()
	repository := filepath.Join(t.TempDir(), "candidate repository")
	if err := os.Mkdir(repository, 0o700); err != nil {
		t.Fatal(err)
	}
	cliGitRun(t, repository, "init", "--initial-branch=main")
	cliGitRun(t, repository, "config", "user.name", "ReleaseKit Test")
	cliGitRun(t, repository, "config", "user.email", "releasekit@example.test")
	cliGitRun(t, repository, "config", "commit.gpgsign", "false")
	write := func(name, value string) {
		t.Helper()
		path := filepath.Join(repository, filepath.FromSlash(name))
		if err := os.MkdirAll(filepath.Dir(path), 0o700); err != nil {
			t.Fatal(err)
		}
		if err := os.WriteFile(path, []byte(value), 0o600); err != nil {
			t.Fatal(err)
		}
	}
	write("go.mod", "module example.com/cli-candidate\n\ngo 1.25.0\n")
	write("candidate_test.go", "package candidate\nimport \"testing\"\nfunc TestFixture(t *testing.T) {}\n")
	write("docs/releases/v1.2.3.md", "# Example Product v1.2.3\n\nRelease note.\n")
	cliGitRun(t, repository, "add", "--all")
	cliGitRun(t, repository, "commit", "-m", "candidate")
	return repository
}

func cliGitRun(t *testing.T, repository string, args ...string) {
	t.Helper()
	commandArgs := append([]string{"git"}, args...)
	command := exec.Command(commandArgs[0], commandArgs[1:]...)
	command.Dir = repository
	output, err := command.CombinedOutput()
	if err != nil {
		t.Fatalf("%v: %v\n%s", commandArgs, err, output)
	}
}

func cliGitOutput(t *testing.T, repository string, args ...string) string {
	t.Helper()
	commandArgs := append([]string{"git"}, args...)
	command := exec.Command(commandArgs[0], commandArgs[1:]...)
	command.Dir = repository
	output, err := command.Output()
	if err != nil {
		t.Fatalf("%v: %v", commandArgs, err)
	}
	return strings.TrimSpace(string(output))
}