package config_test

import (
	"encoding/json"
	"os"
	"path/filepath"
	"testing"

	"task/internal/config"
)

func TestDefaultsAndApplyDefaults(t *testing.T) {
	home := "/tmp/fake-home"
	cfg := config.Defaults(home)
	if cfg.ActiveProject != config.DefaultProject {
		t.Fatalf("ActiveProject = %q", cfg.ActiveProject)
	}
	wantData := filepath.Join(home, ".local", "share", config.AppName)
	if cfg.DataDir != wantData {
		t.Fatalf("DataDir = %q, want %q", cfg.DataDir, wantData)
	}

	partial := config.Config{}
	partial.ApplyDefaults(home)
	if partial.ActiveProject != config.DefaultProject || partial.DataDir != wantData {
		t.Fatalf("ApplyDefaults failed: %+v", partial)
	}
}

func TestSaveRoundTrip(t *testing.T) {
	home := t.TempDir()
	t.Setenv("HOME", home)
	t.Setenv("TASK_MASTER_HOME", "")
	t.Setenv("TASK_MASTER_DATA_DIR", "")

	cfg := config.Defaults(home)
	cfg.ActiveProject = "work"
	if err := config.Save(&cfg); err != nil {
		t.Fatalf("Save: %v", err)
	}

	path := config.Path(home)
	data, err := os.ReadFile(path)
	if err != nil {
		t.Fatalf("ReadFile: %v", err)
	}
	var got config.Config
	if err := json.Unmarshal(data, &got); err != nil {
		t.Fatalf("Unmarshal: %v", err)
	}
	if got.ActiveProject != "work" {
		t.Fatalf("ActiveProject = %q", got.ActiveProject)
	}
}

func TestLoadOrCreate(t *testing.T) {
	home := t.TempDir()
	t.Setenv("HOME", home)
	t.Setenv("TASK_MASTER_HOME", "")
	t.Setenv("TASK_MASTER_DATA_DIR", "")

	cfg, err := config.LoadOrCreate()
	if err != nil {
		t.Fatalf("LoadOrCreate: %v", err)
	}
	if cfg.ActiveProject != config.DefaultProject {
		t.Fatalf("ActiveProject = %q", cfg.ActiveProject)
	}

	cfgPath := config.Path(home)
	if _, err := os.Stat(cfgPath); err != nil {
		t.Fatalf("config file missing: %v", err)
	}
	projectDir := filepath.Join(cfg.DataDir, "projects", cfg.ActiveProject)
	if st, err := os.Stat(projectDir); err != nil || !st.IsDir() {
		t.Fatalf("project dir missing: %v", err)
	}

	// Second call loads existing
	cfg2, err := config.LoadOrCreate()
	if err != nil {
		t.Fatalf("LoadOrCreate 2: %v", err)
	}
	if cfg2.DataDir != cfg.DataDir {
		t.Fatalf("DataDir mismatch")
	}
}

func TestTASK_MASTER_HOME(t *testing.T) {
	sandbox := t.TempDir()
	t.Setenv("TASK_MASTER_HOME", sandbox)
	t.Setenv("TASK_MASTER_DATA_DIR", "")

	cfg, err := config.LoadOrCreate()
	if err != nil {
		t.Fatalf("LoadOrCreate: %v", err)
	}
	wantCfg := config.Path(sandbox)
	if _, err := os.Stat(wantCfg); err != nil {
		t.Fatalf("config under sandbox missing: %v", err)
	}
	wantData := filepath.Join(sandbox, ".local", "share", config.AppName)
	if cfg.DataDir != wantData {
		t.Fatalf("DataDir = %q, want %q", cfg.DataDir, wantData)
	}
}

func TestTASK_MASTER_DATA_DIR(t *testing.T) {
	home := t.TempDir()
	data := t.TempDir()
	t.Setenv("HOME", home)
	t.Setenv("TASK_MASTER_HOME", "")
	t.Setenv("TASK_MASTER_DATA_DIR", data)

	cfg, err := config.LoadOrCreate()
	if err != nil {
		t.Fatalf("LoadOrCreate: %v", err)
	}
	if cfg.DataDir != data {
		t.Fatalf("DataDir = %q, want %q", cfg.DataDir, data)
	}
}