package openai

import (
	"testing"

	"github.com/stretchr/testify/assert"
)

func TestIsCodexCLIRequest(t *testing.T) {
	tests := []struct {
		name      string
		userAgent string
		expected  bool
	}{
		{"codex_vscode", "codex_vscode/1.0.0", true},
		{"codex_cli_rs", "codex_cli_rs/0.1.2", true},
		{"codex_cli_rs with extras", "codex_cli_rs/0.1.2 (linux)", true},
		{"regular browser", "Mozilla/5.0", false},
		{"empty string", "", false},
		{"whitespace only", "   ", false},
		{"mixed case", "Codex_Vscode/1.0.0", true},
		{"partial match wrong prefix", "codex_app/1.0", false},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			result := IsCodexCLIRequest(tt.userAgent)
			assert.Equal(t, tt.expected, result)
		})
	}
}

func TestIsCodexOfficialClientRequest(t *testing.T) {
	tests := []struct {
		name      string
		userAgent string
		expected  bool
	}{
		{"codex_cli_rs", "codex_cli_rs/1.0", true},
		{"codex_vscode", "codex_vscode/1.0.0", true},
		{"codex_app", "codex_app/1.0", true},
		{"codex_chatgpt_desktop", "codex_chatgpt_desktop/1.0", true},
		{"codex_atlas", "codex_atlas/1.0", true},
		{"codex_exec", "codex_exec/1.0", true},
		{"codex_sdk_ts", "codex_sdk_ts/1.0", true},
		{"codex prefix with space", "codex something", true},
		{"regular browser", "Mozilla/5.0", false},
		{"empty string", "", false},
		{"mixed case", "Codex_App/1.0", true},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			result := IsCodexOfficialClientRequest(tt.userAgent)
			assert.Equal(t, tt.expected, result)
		})
	}
}

func TestIsCodexOfficialClientOriginator(t *testing.T) {
	tests := []struct {
		name       string
		originator string
		expected   bool
	}{
		{"codex_ prefix", "codex_something", true},
		{"codex space prefix", "codex something", true},
		{"codex_vscode", "codex_vscode/1.0", true},
		{"regular originator", "some_other_app", false},
		{"empty string", "", false},
		{"mixed case prefix", "Codex_Something", true},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			result := IsCodexOfficialClientOriginator(tt.originator)
			assert.Equal(t, tt.expected, result)
		})
	}
}

func TestIsCodexOfficialClientByHeaders(t *testing.T) {
	tests := []struct {
		name       string
		userAgent  string
		originator string
		expected   bool
	}{
		{"UA match only", "codex_app/1.0", "", true},
		{"originator match only", "", "codex_something", true},
		{"both match", "codex_app/1.0", "codex_something", true},
		{"neither match", "Mozilla/5.0", "some_app", false},
		{"both empty", "", "", false},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			result := IsCodexOfficialClientByHeaders(tt.userAgent, tt.originator)
			assert.Equal(t, tt.expected, result)
		})
	}
}

func TestNormalizeCodexClientHeader(t *testing.T) {
	tests := []struct {
		input    string
		expected string
	}{
		{"Codex_CLI", "codex_cli"},
		{"  whitespace  ", "whitespace"},
		{"UPPERCASE", "uppercase"},
		{"", ""},
		{"MixedCASE123", "mixedcase123"},
	}

	for _, tt := range tests {
		t.Run(tt.input, func(t *testing.T) {
			result := normalizeCodexClientHeader(tt.input)
			assert.Equal(t, tt.expected, result)
		})
	}
}

func TestMatchCodexClientHeaderPrefixes(t *testing.T) {
	prefixes := []string{"codex_", "codex "}

	tests := []struct {
		name     string
		value    string
		expected bool
	}{
		{"prefix match", "codex_vscode", true},
		{"contains match", "some_codex_app", true},
		{"no match", "other_app", false},
		{"empty value", "", false},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			result := matchCodexClientHeaderPrefixes(tt.value, prefixes)
			assert.Equal(t, tt.expected, result)
		})
	}
}

func TestMatchCodexClientHeaderPrefixesEmptyPrefix(t *testing.T) {
	// Test with empty prefix in list (should be skipped)
	prefixes := []string{"", "codex_"}
	result := matchCodexClientHeaderPrefixes("codex_app", prefixes)
	assert.True(t, result)
}
