package config

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

func TestLoadNormalizesDeviceAliases(t *testing.T) {
	configPath := filepath.Join(t.TempDir(), "config.json")
	contents := `{
	  "mqtt": {
	    "broker": "tcp://127.0.0.1:1883",
	    "client_id": "mqqt-scrubber",
	    "topics": ["tele/+/STATE"],
	    "qos": 0
	  },
	  "influx": {
	    "url": "http://127.0.0.1:8181",
	    "database": "home",
	    "precision": "ns"
	  },
	  "app": {
	    "batch_size": 200,
	    "buffer_size": 1000,
	    "flush_interval": "10s",
	    "flush_timeout": "10s",
	    "log_level": "info",
	    "health_address": ":8080"
	  },
	  "device_aliases": {
	    "Kitchen-Plug": "Kitchen Plug",
	    " Patio Sensor ": "Patio Sensor",
	    "unused": "   "
	  }
	}`

	if err := os.WriteFile(configPath, []byte(contents), 0o644); err != nil {
		t.Fatalf("write config file: %v", err)
	}

	cfg, err := Load(configPath)
	if err != nil {
		t.Fatalf("Load returned error: %v", err)
	}

	if got := cfg.DeviceAliases["kitchen_plug"]; got != "Kitchen Plug" {
		t.Fatalf("unexpected kitchen alias: got %q", got)
	}

	if got := cfg.DeviceAliases["patio_sensor"]; got != "Patio Sensor" {
		t.Fatalf("unexpected patio alias: got %q", got)
	}

	if _, exists := cfg.DeviceAliases["unused"]; exists {
		t.Fatal("expected blank aliases to be discarded")
	}
}

func TestLoadOverridesDeviceAliasesFromEnv(t *testing.T) {
	t.Setenv("MQTT_SCRUBBER_DEVICE_ALIASES", `{"Desk-Plug":"Desk Plug"}`)

	configPath := filepath.Join(t.TempDir(), "config.json")
	contents := `{
	  "mqtt": {
	    "broker": "tcp://127.0.0.1:1883",
	    "client_id": "mqqt-scrubber",
	    "topics": ["tele/+/STATE"],
	    "qos": 0
	  },
	  "influx": {
	    "url": "http://127.0.0.1:8181",
	    "database": "home",
	    "precision": "ns"
	  },
	  "app": {
	    "batch_size": 200,
	    "buffer_size": 1000,
	    "flush_interval": "10s",
	    "flush_timeout": "10s",
	    "log_level": "info",
	    "health_address": ":8080"
	  },
	  "device_aliases": {
	    "Kitchen-Plug": "Kitchen Plug"
	  }
	}`

	if err := os.WriteFile(configPath, []byte(contents), 0o644); err != nil {
		t.Fatalf("write config file: %v", err)
	}

	cfg, err := Load(configPath)
	if err != nil {
		t.Fatalf("Load returned error: %v", err)
	}

	if len(cfg.DeviceAliases) != 1 {
		t.Fatalf("expected env aliases to replace file aliases, got %d entries", len(cfg.DeviceAliases))
	}

	if got := cfg.DeviceAliases["desk_plug"]; got != "Desk Plug" {
		t.Fatalf("unexpected desk alias: got %q", got)
	}
}

func TestLoadSupportsTasmotaTimeZone(t *testing.T) {
	configPath := filepath.Join(t.TempDir(), "config.json")
	contents := `{
	  "mqtt": {
	    "broker": "tcp://127.0.0.1:1883",
	    "client_id": "mqqt-scrubber",
	    "topics": ["tele/+/STATE"],
	    "qos": 0
	  },
	  "influx": {
	    "url": "http://127.0.0.1:8181",
	    "database": "home",
	    "precision": "ns"
	  },
	  "app": {
	    "batch_size": 200,
	    "buffer_size": 1000,
	    "flush_interval": "10s",
	    "flush_timeout": "10s",
	    "log_level": "info",
	    "health_address": ":8080",
	    "tasmota_time_zone": "Europe/Prague"
	  }
	}`

	if err := os.WriteFile(configPath, []byte(contents), 0o644); err != nil {
		t.Fatalf("write config file: %v", err)
	}

	cfg, err := Load(configPath)
	if err != nil {
		t.Fatalf("Load returned error: %v", err)
	}

	if got := cfg.App.TasmotaLocation().String(); got != "Europe/Prague" {
		t.Fatalf("unexpected tasmota timezone: got %q", got)
	}
}

func TestLoadRejectsInvalidTasmotaTimeZone(t *testing.T) {
	configPath := filepath.Join(t.TempDir(), "config.json")
	contents := `{
	  "mqtt": {
	    "broker": "tcp://127.0.0.1:1883",
	    "client_id": "mqqt-scrubber",
	    "topics": ["tele/+/STATE"],
	    "qos": 0
	  },
	  "influx": {
	    "url": "http://127.0.0.1:8181",
	    "database": "home",
	    "precision": "ns"
	  },
	  "app": {
	    "batch_size": 200,
	    "buffer_size": 1000,
	    "flush_interval": "10s",
	    "flush_timeout": "10s",
	    "log_level": "info",
	    "health_address": ":8080",
	    "tasmota_time_zone": "Not/AZone"
	  }
	}`

	if err := os.WriteFile(configPath, []byte(contents), 0o644); err != nil {
		t.Fatalf("write config file: %v", err)
	}

	if _, err := Load(configPath); err == nil {
		t.Fatal("expected Load to reject invalid tasmota_time_zone")
	}
}