package config

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

func writeFile(t *testing.T, name string, mode os.FileMode, content string) string {
	t.Helper()
	path := filepath.Join(t.TempDir(), name)
	if err := os.WriteFile(path, []byte(content), mode); err != nil {
		t.Fatal(err)
	}
	return path
}

func TestLoadEnvOnly(t *testing.T) {
	t.Setenv("MGLPI_URL", "https://cmdb.example/apirest.php/")
	t.Setenv("MGLPI_APP_TOKEN", "a1")
	t.Setenv("MGLPI_USER_TOKEN", "u1")
	cfg, src, err := Load("")
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if cfg.BaseURL != "https://cmdb.example/apirest.php" {
		t.Errorf("BaseURL = %q, want trailing slash trimmed", cfg.BaseURL)
	}
	if cfg.AppToken != "a1" || cfg.UserToken != "u1" {
		t.Errorf("tokens = %q/%q", cfg.AppToken, cfg.UserToken)
	}
	if cfg.ProfileID != 0 {
		t.Errorf("ProfileID = %d, want 0 when unset", cfg.ProfileID)
	}
	if src.Env == "" {
		t.Errorf("source env = %q, want a key name", src.Env)
	}
}

func TestLoadFileOnly(t *testing.T) {
	path := writeFile(t, "env", 0o600,
		"MGLPI_URL=https://cmdb.example/apirest.php\nMGLPI_APP_TOKEN=a2\nMGLPI_USER_TOKEN=u2\nMGLPI_PROFILE_ID=5\n")
	cfg, _, err := Load(path)
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if cfg.BaseURL != "https://cmdb.example/apirest.php" || cfg.AppToken != "a2" || cfg.UserToken != "u2" {
		t.Errorf("cfg = %+v", cfg)
	}
	if cfg.ProfileID != 5 {
		t.Errorf("ProfileID = %d, want 5", cfg.ProfileID)
	}
}

func TestLoadEnvWinsOverFile(t *testing.T) {
	t.Setenv("MGLPI_USER_TOKEN", "env-user")
	path := writeFile(t, "env", 0o600, "MGLPI_URL=https://cmdb.example/apirest.php\nMGLPI_APP_TOKEN=fa\nMGLPI_USER_TOKEN=file-user\n")
	cfg, src, err := Load(path)
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if cfg.UserToken != "env-user" {
		t.Errorf("UserToken = %q, want env value to win", cfg.UserToken)
	}
	if src.File != "" && src.Env != "MGLPI_USER_TOKEN" {
		t.Errorf("source = %+v", src)
	}
}

func TestLoadRejectsLooseFile(t *testing.T) {
	path := writeFile(t, "env", 0o644, "MGLPI_URL=https://cmdb.example/apirest.php\nMGLPI_APP_TOKEN=a\nMGLPI_USER_TOKEN=u\n")
	_, _, err := Load(path)
	if err == nil || !strings.Contains(err.Error(), "insecure mode") {
		t.Fatalf("err = %v, want insecure-mode rejection", err)
	}
}

func TestLoadMissingEverything(t *testing.T) {
	_, _, err := Load(filepath.Join(t.TempDir(), "absent"))
	if err == nil || !strings.Contains(err.Error(), "MGLPI_URL") {
		t.Fatalf("err = %v, want guidance naming MGLPI_URL", err)
	}
}

func TestLoadTokenAbsent(t *testing.T) {
	t.Setenv("MGLPI_URL", "https://cmdb.example/apirest.php")
	t.Setenv("MGLPI_APP_TOKEN", "a")
	path := writeFile(t, "env", 0o600, "# nothing useful\n")
	_, _, err := Load(path)
	if err == nil || !strings.Contains(err.Error(), "MGLPI_USER_TOKEN") {
		t.Fatalf("err = %v, want MGLPI_USER_TOKEN named", err)
	}
}

func TestLoadMalformedLineReportsNumberOnly(t *testing.T) {
	path := writeFile(t, "env", 0o600,
		"MGLPI_URL=https://cmdb.example/apirest.php\nMGLPI_APP_TOKEN=secret-app\nMGLPI_USER_TOKEN=secret-user\nBROKEN LINE HERE\n")
	_, _, err := Load(path)
	if err == nil || !strings.Contains(err.Error(), "line 4") {
		t.Fatalf("err = %v, want line-number-only diagnostic", err)
	}
	if err != nil && (strings.Contains(err.Error(), "secret-app") || strings.Contains(err.Error(), "secret-user")) {
		t.Fatalf("err = %v leaks file contents", err)
	}
}

func TestLoadQuotedAndExported(t *testing.T) {
	path := writeFile(t, "env", 0o600,
		"export MGLPI_URL=\"https://cmdb.example/apirest.php\"\nexport MGLPI_APP_TOKEN='a3'\nexport MGLPI_USER_TOKEN=u3\n")
	cfg, _, err := Load(path)
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if cfg.BaseURL != "https://cmdb.example/apirest.php" || cfg.AppToken != "a3" || cfg.UserToken != "u3" {
		t.Errorf("cfg = %+v, want quotes stripped", cfg)
	}
}

func TestProfileIDValidation(t *testing.T) {
	t.Run("absent is 0", func(t *testing.T) {
		path := writeFile(t, "env", 0o600, "MGLPI_URL=https://cmdb.example/apirest.php\nMGLPI_APP_TOKEN=a\nMGLPI_USER_TOKEN=u\n")
		cfg, _, err := Load(path)
		if err != nil || cfg.ProfileID != 0 {
			t.Fatalf("cfg = %+v err = %v", cfg, err)
		}
	})
	t.Run("empty string is 0", func(t *testing.T) {
		path := writeFile(t, "env", 0o600, "MGLPI_URL=https://cmdb.example/apirest.php\nMGLPI_APP_TOKEN=a\nMGLPI_USER_TOKEN=u\nMGLPI_PROFILE_ID=\n")
		cfg, _, err := Load(path)
		if err != nil || cfg.ProfileID != 0 {
			t.Fatalf("cfg = %+v err = %v", cfg, err)
		}
	})
	t.Run("garbage is an error that never echoes the value", func(t *testing.T) {
		path := writeFile(t, "env", 0o600, "MGLPI_URL=https://cmdb.example/apirest.php\nMGLPI_APP_TOKEN=a\nMGLPI_USER_TOKEN=u\nMGLPI_PROFILE_ID=hotliner\n")
		_, _, err := Load(path)
		if err == nil || !strings.Contains(err.Error(), "MGLPI_PROFILE_ID") {
			t.Fatalf("err = %v, want MGLPI_PROFILE_ID named", err)
		}
		if strings.Contains(err.Error(), "hotliner") {
			t.Fatalf("err = %v echoes the value", err)
		}
	})
}