package config

import (
	"os"
	"path/filepath"
	"testing"
	"time"
)

func TestDefaultIncludesServerNetworkSettings(t *testing.T) {
	cfg := Default()
	if cfg.Server.Addr != ":8080" {
		t.Fatalf("Addr = %q, want :8080", cfg.Server.Addr)
	}
	if cfg.Server.ReadTimeout != 15*time.Second {
		t.Fatalf("ReadTimeout = %v, want 15s", cfg.Server.ReadTimeout)
	}
	if cfg.Server.WriteTimeout != 15*time.Second {
		t.Fatalf("WriteTimeout = %v, want 15s", cfg.Server.WriteTimeout)
	}
	if cfg.Server.IdleTimeout != 60*time.Second {
		t.Fatalf("IdleTimeout = %v, want 60s", cfg.Server.IdleTimeout)
	}
	if cfg.Server.MaxHeaderBytes != 1048576 {
		t.Fatalf("MaxHeaderBytes = %d, want 1048576", cfg.Server.MaxHeaderBytes)
	}
}

func TestLoadParsesServerNetworkSettingsFromYAML(t *testing.T) {
	dir := t.TempDir()
	path := filepath.Join(dir, "config.yaml")
	data := []byte(`server:
  addr: ":9090"
  readTimeout: "2s"
  writeTimeout: "3s"
  idleTimeout: "4s"
  maxHeaderBytes: 2048
workspace:
  root: "./tmp-workspaces"
process:
  opencodeCommand: "fake-opencode"
`)
	if err := os.WriteFile(path, data, 0o644); err != nil {
		t.Fatal(err)
	}

	cfg, err := Load(path)
	if err != nil {
		t.Fatalf("Load returned error: %v", err)
	}
	if cfg.Server.Addr != ":9090" {
		t.Fatalf("Addr = %q, want :9090", cfg.Server.Addr)
	}
	if cfg.Server.ReadTimeout != 2*time.Second || cfg.Server.WriteTimeout != 3*time.Second || cfg.Server.IdleTimeout != 4*time.Second {
		t.Fatalf("timeouts = %v/%v/%v, want 2s/3s/4s", cfg.Server.ReadTimeout, cfg.Server.WriteTimeout, cfg.Server.IdleTimeout)
	}
	if cfg.Server.MaxHeaderBytes != 2048 {
		t.Fatalf("MaxHeaderBytes = %d, want 2048", cfg.Server.MaxHeaderBytes)
	}
}

func TestLoadAppliesServerEnvironmentOverrides(t *testing.T) {
	t.Setenv("CODESPACE_ADDR", ":7070")
	t.Setenv("CODESPACE_READ_TIMEOUT", "5s")
	t.Setenv("CODESPACE_WRITE_TIMEOUT", "6s")
	t.Setenv("CODESPACE_IDLE_TIMEOUT", "7s")
	t.Setenv("CODESPACE_MAX_HEADER_BYTES", "4096")

	cfg, err := Load(filepath.Join(t.TempDir(), "missing.yaml"))
	if err != nil {
		t.Fatalf("Load returned error: %v", err)
	}
	if cfg.Server.Addr != ":7070" {
		t.Fatalf("Addr = %q, want :7070", cfg.Server.Addr)
	}
	if cfg.Server.ReadTimeout != 5*time.Second || cfg.Server.WriteTimeout != 6*time.Second || cfg.Server.IdleTimeout != 7*time.Second {
		t.Fatalf("timeouts = %v/%v/%v, want 5s/6s/7s", cfg.Server.ReadTimeout, cfg.Server.WriteTimeout, cfg.Server.IdleTimeout)
	}
	if cfg.Server.MaxHeaderBytes != 4096 {
		t.Fatalf("MaxHeaderBytes = %d, want 4096", cfg.Server.MaxHeaderBytes)
	}
}

func TestLoadRejectsInvalidDuration(t *testing.T) {
	dir := t.TempDir()
	path := filepath.Join(dir, "config.yaml")
	data := []byte(`server:
  readTimeout: "garbage"
`)
	if err := os.WriteFile(path, data, 0o644); err != nil {
		t.Fatal(err)
	}
	if _, err := Load(path); err == nil {
		t.Fatal("expected invalid duration error")
	}
}