//go:build linux || freebsd
// +build linux freebsd

package config

import (
	"strings"
	"testing"
	"time"

	"codeberg.org/petrbalvin/interpres"
)

func TestDefaultConfig(t *testing.T) {
	cfg := DefaultConfig()

	if cfg.Timeout != 30*time.Minute {
		t.Errorf("Expected default timeout 30m, got %v", cfg.Timeout)
	}
	if cfg.Parallel != 0 {
		t.Errorf("Expected default parallel 0, got %d", cfg.Parallel)
	}
	if cfg.Verbose != true {
		t.Errorf("Expected default verbose true, got %v", cfg.Verbose)
	}
	if cfg.AutoDecompress != true {
		t.Errorf("Expected default auto decompress true, got %v", cfg.AutoDecompress)
	}
	if cfg.ChecksumAlgo != "sha256" {
		t.Errorf("Expected default checksum algo sha256, got %s", cfg.ChecksumAlgo)
	}
}

func TestConfigMerge(t *testing.T) {
	cfg := DefaultConfig()

	cfg.Merge(&CLIFlags{
		Timeout:         1 * time.Hour,
		Parallel:        4,
		Verbose:         true,
		Debug:           false,
		MaxSpeed:        1024 * 1024,
		Proxy:           "http://proxy",
		NoIPv4:          false,
		NoDecompress:    false,
		Username:        "user",
		Password:        "pass",
		CookieJar:       "",
		Recursive:       false,
		MaxDepth:        0,
		FollowExternal:  false,
		ExcludePatterns: nil,
		Extract:         false,
		ExtractDir:      "",
		StripComponents: 0,
	})

	if cfg.Timeout != 1*time.Hour {
		t.Errorf("Expected timeout 1h, got %v", cfg.Timeout)
	}
	if cfg.Parallel != 4 {
		t.Errorf("Expected parallel 4, got %d", cfg.Parallel)
	}
	if cfg.Proxy != "http://proxy" {
		t.Errorf("Expected proxy http://proxy, got %s", cfg.Proxy)
	}
	if cfg.Auth.Username != "user" {
		t.Errorf("Expected username user, got %s", cfg.Auth.Username)
	}
}

func TestGetEffectiveTimeout(t *testing.T) {
	cfg := DefaultConfig()

	// User override
	timeout := cfg.GetEffectiveTimeout(1000000, 1*time.Hour)
	if timeout != 1*time.Hour {
		t.Errorf("Expected 1h with user override, got %v", timeout)
	}

	// Auto calculation for known size
	timeout = cfg.GetEffectiveTimeout(100*1024*1024, 0)
	if timeout < 30*time.Second {
		t.Errorf("Expected at least 30s for auto timeout, got %v", timeout)
	}

	// Unknown size
	timeout = cfg.GetEffectiveTimeout(-1, 0)
	if timeout != 30*time.Minute {
		t.Errorf("Expected 30m for unknown size, got %v", timeout)
	}
}

func TestGetParallelConnections(t *testing.T) {
	cfg := DefaultConfig()

	// Explicit parallel
	cfg.Parallel = 8
	if cfg.GetParallelConnections(1000) != 8 {
		t.Errorf("Expected 8 explicit connections, got %d", cfg.GetParallelConnections(1000))
	}

	// Auto for large file
	cfg.Parallel = 0
	if cfg.GetParallelConnections(200*1024*1024) != 4 {
		t.Errorf("Expected 4 auto connections for large file, got %d", cfg.GetParallelConnections(200*1024*1024))
	}

	// Auto for small file
	if cfg.GetParallelConnections(1024) != 1 {
		t.Errorf("Expected 1 connection for small file, got %d", cfg.GetParallelConnections(1024))
	}
}

func TestShouldUseColors(t *testing.T) {
	cfg := DefaultConfig()

	// Always
	cfg.Color = "always"
	if !cfg.ShouldUseColors() {
		t.Error("Expected colors with always setting")
	}

	// Never
	cfg.Color = "never"
	if cfg.ShouldUseColors() {
		t.Error("Expected no colors with never setting")
	}

	// Auto (default)
	cfg.Color = "auto"
	// Can't test environment in unit tests, but verify it doesn't panic
	_ = cfg.ShouldUseColors()
}

func TestIsExcluded(t *testing.T) {
	cfg := DefaultConfig()
	cfg.Recursive.ExcludePatterns = []string{"example.com", "test.org"}

	if !cfg.IsExcluded("https://example.com/file.zip") {
		t.Error("Expected example.com to be excluded")
	}
	if !cfg.IsExcluded("https://test.org/file.zip") {
		t.Error("Expected test.org to be excluded")
	}
	if cfg.IsExcluded("https://other.com/file.zip") {
		t.Error("Expected other.com to not be excluded")
	}
}

func TestGetRecursiveDelay(t *testing.T) {
	cfg := DefaultConfig()

	delay := cfg.GetRecursiveDelay()
	if delay != 100*time.Millisecond {
		t.Errorf("Expected default delay 100ms, got %v", delay)
	}

	cfg.Recursive.Delay = "500ms"
	delay = cfg.GetRecursiveDelay()
	if delay != 500*time.Millisecond {
		t.Errorf("Expected delay 500ms, got %v", delay)
	}

	// Invalid delay should fall back to default
	cfg.Recursive.Delay = "invalid"
	delay = cfg.GetRecursiveDelay()
	if delay != 100*time.Millisecond {
		t.Errorf("Expected default delay for invalid value, got %v", delay)
	}
}

func TestGetExtractOutputDir(t *testing.T) {
	cfg := DefaultConfig()

	// Empty config should return default
	dir := cfg.GetExtractOutputDir("/default")
	if dir != "/default" {
		t.Errorf("Expected /default, got %s", dir)
	}

	// Config with output dir
	cfg.Extract.OutputDir = "/custom"
	dir = cfg.GetExtractOutputDir("/default")
	if dir != "/custom" {
		t.Errorf("Expected /custom, got %s", dir)
	}
}

func TestParseSpeed(t *testing.T) {
	tests := []struct {
		input    string
		expected int64
	}{
		{"", 0},
		{"0", 0},
		{"100", 100},
		{"100B/s", 100},
		{"1KB/s", 1000},
		{"1MB/s", 1000000},
		{"1GB/s", 1000000000},
		{"10MB/s", 10000000},
		{"100 KB/s", 100000},
	}

	for _, test := range tests {
		result := ParseSpeed(test.input)
		if result != test.expected {
			t.Errorf("ParseSpeed(%s) = %d, expected %d", test.input, result, test.expected)
		}
	}
}

func TestExpandTilde(t *testing.T) {
	// Test with tilde
	path := expandTilde("~/test/file.txt")
	if path == "~/test/file.txt" {
		t.Error("Expected tilde to be expanded")
	}

	// Test without tilde
	path = expandTilde("/absolute/path/file.txt")
	if path != "/absolute/path/file.txt" {
		t.Errorf("Expected unchanged path, got %s", path)
	}
}

func TestConfigSave(t *testing.T) {
	cfg := DefaultConfig()
	cfg.Verbose = true
	cfg.Parallel = 4

	// Save should not fail (may create directories)
	err := cfg.Save()
	// We can't test the actual file creation in unit tests without a temp dir
	// but we verify the method doesn't panic
	_ = err
}

func TestLoadNonExistentConfig(t *testing.T) {
	cfg, err := Load("/nonexistent/path/config.toml")
	if err != nil {
		t.Fatalf("Expected no error for non-existent config, got %v", err)
	}
	if cfg == nil {
		t.Fatal("Expected default config for non-existent file")
	}
}

func TestMarshalUnmarshalTOML(t *testing.T) {
	cfg := DefaultConfig()
	cfg.Parallel = 4
	cfg.Verbose = true
	cfg.Timeout = 5 * time.Minute
	cfg.Auth.Username = "testuser"
	cfg.Auth.AuthType = "basic"
	cfg.Recursive.Enabled = true
	cfg.Recursive.MaxDepth = 5
	cfg.DNSServers = []string{"1.1.1.1", "8.8.8.8"}

	data, err := interpres.Marshal(*cfg)
	if err != nil {
		t.Fatalf("interpres.Marshal failed: %v", err)
	}

	tomlStr := string(data)
	// Verify key elements are present
	if !strings.Contains(tomlStr, "parallel = 4") {
		t.Errorf("expected 'parallel = 4' in TOML output, got:\n%s", tomlStr)
	}
	if !strings.Contains(tomlStr, "verbose = true") {
		t.Errorf("expected 'verbose = true' in TOML output, got:\n%s", tomlStr)
	}
	if !strings.Contains(tomlStr, "[auth]") {
		t.Errorf("expected '[auth]' section in TOML output, got:\n%s", tomlStr)
	}
	if !strings.Contains(tomlStr, "username = \"testuser\"") {
		t.Errorf("expected 'username = \"testuser\"' in TOML output, got:\n%s", tomlStr)
	}
	if !strings.Contains(tomlStr, "[recursive]") {
		t.Errorf("expected '[recursive]' section in TOML output, got:\n%s", tomlStr)
	}
	if !strings.Contains(tomlStr, "dns_servers = [") {
		t.Errorf("expected 'dns_servers' array in TOML output, got:\n%s", tomlStr)
	}

	// Roundtrip: unmarshal back and verify
	var cfg2 Config
	if err := interpres.Unmarshal(data, &cfg2); err != nil {
		t.Fatalf("interpres.Unmarshal failed: %v", err)
	}

	if cfg2.Parallel != 4 {
		t.Errorf("roundtrip: expected Parallel 4, got %d", cfg2.Parallel)
	}
	if cfg2.Verbose != true {
		t.Errorf("roundtrip: expected Verbose true, got %v", cfg2.Verbose)
	}
	if cfg2.Auth.Username != "testuser" {
		t.Errorf("roundtrip: expected Auth.Username testuser, got %s", cfg2.Auth.Username)
	}
	if cfg2.Recursive.MaxDepth != 5 {
		t.Errorf("roundtrip: expected Recursive.MaxDepth 5, got %d", cfg2.Recursive.MaxDepth)
	}
	if len(cfg2.DNSServers) != 2 || cfg2.DNSServers[0] != "1.1.1.1" {
		t.Errorf("roundtrip: expected DNSServers [1.1.1.1, 8.8.8.8], got %v", cfg2.DNSServers)
	}
}

func TestMarshalTOMLDefaultConfig(t *testing.T) {
	cfg := DefaultConfig()
	data, err := interpres.Marshal(*cfg)
	if err != nil {
		t.Fatalf("interpres.Marshal with default config failed: %v", err)
	}
	if len(data) == 0 {
		t.Error("expected non-empty TOML output for default config")
	}

	// Verify it can be parsed back
	var cfg2 Config
	if err := interpres.Unmarshal(data, &cfg2); err != nil {
		t.Fatalf("interpres.Unmarshal of default output failed: %v", err)
	}
	if cfg2.OutputDir != "." {
		t.Errorf("expected OutputDir '.', got %s", cfg2.OutputDir)
	}
	if cfg2.ChecksumAlgo != "sha256" {
		t.Errorf("expected ChecksumAlgo sha256, got %s", cfg2.ChecksumAlgo)
	}
}

func TestConfigPath(t *testing.T) {
	cfg := DefaultConfig()
	path := cfg.Path()
	// Path should be empty when loaded with DefaultConfig
	_ = path
}