package app

import (
	"bytes"
	"os"
	"path/filepath"
	"strings"
	"testing"
)

func TestExecuteValidCommands(t *testing.T) {
	pipelinePath, sessionPath := writeValidConfigFiles(t)

	cases := []struct {
		name    string
		args    []string
		wantOut string
	}{
		{name: "run", args: []string{"run", "--config", pipelinePath, "--session", sessionPath}, wantOut: "narratio run: configuration loaded and valid"},
		{name: "plan", args: []string{"plan", "--config", pipelinePath, "--session", sessionPath}, wantOut: "narratio plan: configuration loaded and valid"},
		{name: "status", args: []string{"status"}, wantOut: "narratio status: not yet implemented"},
		{name: "resume", args: []string{"resume"}, wantOut: "narratio resume: not yet implemented"},
		{name: "run-stage", args: []string{"run-stage", "polish"}, wantOut: "narratio run-stage: not yet implemented"},
	}

	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			var stdout bytes.Buffer
			var stderr bytes.Buffer

			code := Execute(tc.args, &stdout, &stderr)
			if code != 0 {
				t.Fatalf("exit code = %d, want 0", code)
			}
			if stderr.Len() != 0 {
				t.Fatalf("stderr = %q, want empty", stderr.String())
			}
			if !strings.Contains(stdout.String(), tc.wantOut) {
				t.Fatalf("stdout = %q, want to contain %q", stdout.String(), tc.wantOut)
			}
		})
	}
}

func TestExecuteMissingConfigFlags(t *testing.T) {
	cases := []struct {
		name string
		args []string
		want string
	}{
		{name: "run missing flags", args: []string{"run"}, want: "run: --config and --session are required"},
		{name: "plan missing flags", args: []string{"plan"}, want: "plan: --config and --session are required"},
	}

	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			var stdout bytes.Buffer
			var stderr bytes.Buffer

			code := Execute(tc.args, &stdout, &stderr)
			if code == 0 {
				t.Fatalf("exit code = 0, want non-zero")
			}
			if stdout.Len() != 0 {
				t.Fatalf("stdout = %q, want empty", stdout.String())
			}
			if !strings.Contains(stderr.String(), tc.want) {
				t.Fatalf("stderr = %q, want to contain %q", stderr.String(), tc.want)
			}
		})
	}
}

func TestExecuteInvalidCommand(t *testing.T) {
	var stdout bytes.Buffer
	var stderr bytes.Buffer

	code := Execute([]string{"bogus"}, &stdout, &stderr)
	if code == 0 {
		t.Fatalf("exit code = 0, want non-zero")
	}
	if stdout.Len() != 0 {
		t.Fatalf("stdout = %q, want empty", stdout.String())
	}
	out := stderr.String()
	if !strings.Contains(out, "unknown command") {
		t.Fatalf("stderr = %q, want unknown command message", out)
	}
	if !strings.Contains(out, "Usage: narratio") {
		t.Fatalf("stderr = %q, want usage message", out)
	}
}

func TestExecuteMissingCommand(t *testing.T) {
	var stdout bytes.Buffer
	var stderr bytes.Buffer

	code := Execute(nil, &stdout, &stderr)
	if code == 0 {
		t.Fatalf("exit code = 0, want non-zero")
	}
	if stdout.Len() != 0 {
		t.Fatalf("stdout = %q, want empty", stdout.String())
	}
	if !strings.Contains(stderr.String(), "Usage: narratio") {
		t.Fatalf("stderr = %q, want usage message", stderr.String())
	}
}

func writeValidConfigFiles(t *testing.T) (string, string) {
	t.Helper()

	dir := t.TempDir()
	pipelinePath := filepath.Join(dir, "pipeline.yml")
	sessionPath := filepath.Join(dir, "session.yml")

	pipelineYAML := `workspace:
  root: /tmp/narratio
storage:
  backend: s3
whisperx:
  timeout: 15m
seriatim:
  timeout: 30s
audita:
  timeout: 1h
analyzer:
  timeout: 20m
  artifacts:
    output_dir: artifacts
notification:
  timeout: 10s
`

	sessionYAML := `session_id: 2026-05-03
inputs:
  audio_dir: ./audio
  speakers_file: ./speakers.yml
  autocorrect_file: ./autocorrect.yml
  glossary_file: ./glossary.yml
`

	if err := os.WriteFile(pipelinePath, []byte(pipelineYAML), 0o644); err != nil {
		t.Fatalf("write pipeline config: %v", err)
	}
	if err := os.WriteFile(sessionPath, []byte(sessionYAML), 0o644); err != nil {
		t.Fatalf("write session config: %v", err)
	}

	return pipelinePath, sessionPath
}