package debug

import (
	"bytes"
	"io"
	"os"
	"testing"
)

func TestEnabled(t *testing.T) {
	tests := []struct {
		name     string
		envValue string
		want     bool
	}{
		{"enabled with value", "1", true},
		{"enabled with any value", "true", true},
		{"disabled when empty", "", false},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			oldEnabled := enabled
			defer func() { enabled = oldEnabled }()

			if tt.envValue != "" {
				enabled = true
			} else {
				enabled = false
			}

			if got := Enabled(); got != tt.want {
				t.Errorf("Enabled() = %v, want %v", got, tt.want)
			}
		})
	}
}

func TestLogf(t *testing.T) {
	tests := []struct {
		name       string
		enabled    bool
		format     string
		args       []interface{}
		wantOutput string
	}{
		{
			name:       "outputs when enabled",
			enabled:    true,
			format:     "test message: %s\n",
			args:       []interface{}{"hello"},
			wantOutput: "test message: hello\n",
		},
		{
			name:       "no output when disabled",
			enabled:    false,
			format:     "test message: %s\n",
			args:       []interface{}{"hello"},
			wantOutput: "",
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			oldEnabled := enabled
			oldStderr := os.Stderr
			defer func() {
				enabled = oldEnabled
				os.Stderr = oldStderr
			}()

			enabled = tt.enabled

			r, w, _ := os.Pipe()
			os.Stderr = w

			Logf(tt.format, tt.args...)

			w.Close()
			var buf bytes.Buffer
			io.Copy(&buf, r)

			if got := buf.String(); got != tt.wantOutput {
				t.Errorf("Logf() output = %q, want %q", got, tt.wantOutput)
			}
		})
	}
}

func TestPrintf(t *testing.T) {
	tests := []struct {
		name       string
		enabled    bool
		format     string
		args       []interface{}
		wantOutput string
	}{
		{
			name:       "outputs when enabled",
			enabled:    true,
			format:     "debug: %d\n",
			args:       []interface{}{42},
			wantOutput: "debug: 42\n",
		},
		{
			name:       "no output when disabled",
			enabled:    false,
			format:     "debug: %d\n",
			args:       []interface{}{42},
			wantOutput: "",
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			oldEnabled := enabled
			oldStdout := os.Stdout
			defer func() {
				enabled = oldEnabled
				os.Stdout = oldStdout
			}()

			enabled = tt.enabled

			r, w, _ := os.Pipe()
			os.Stdout = w

			Printf(tt.format, tt.args...)

			w.Close()
			var buf bytes.Buffer
			io.Copy(&buf, r)

			if got := buf.String(); got != tt.wantOutput {
				t.Errorf("Printf() output = %q, want %q", got, tt.wantOutput)
			}
		})
	}
}