package config

import (
	"errors"
	"log/slog"
	"strings"
	"testing"
	"time"
)

func TestDefaults(t *testing.T) {
	cfg, err := Load(func(k string) string {
		if k == "OLLAMA_URL" {
			return "http://127.0.0.1:11435"
		}
		return ""
	})
	if err != nil {
		t.Fatal(err)
	}
	if cfg.ListenOllama != ":11434" || cfg.ListenComfy != ":8188" {
		t.Fatalf("listen addrs = %s %s", cfg.ListenOllama, cfg.ListenComfy)
	}
	if cfg.ComfyURL != "" {
		t.Fatalf("ComfyURL default = %q, want empty (disabled)", cfg.ComfyURL)
	}
	if cfg.UnloadTimeout != time.Minute || cfg.JobTimeout != 15*time.Minute {
		t.Fatalf("timeouts = %v %v", cfg.UnloadTimeout, cfg.JobTimeout)
	}
	if !cfg.AutoUpdate || cfg.UpdateInterval != 6*time.Hour {
		t.Fatalf("update = %v %v", cfg.AutoUpdate, cfg.UpdateInterval)
	}
	if cfg.LogLevel != slog.LevelWarn {
		t.Fatalf("log level = %v", cfg.LogLevel)
	}
}

func TestLoadRequiresConsumer(t *testing.T) {
	_, err := Load(func(string) string { return "" })
	if err == nil || !strings.Contains(err.Error(), "OLLAMA_URL") {
		t.Fatalf("err = %v, want missing-consumer error", err)
	}
	if !errors.Is(err, ErrNoConsumer) {
		t.Fatalf("err = %v, want errors.Is(err, ErrNoConsumer)", err)
	}
}

func TestAppVersion(t *testing.T) {
	load := func(appVer string) (Config, error) {
		return Load(func(k string) string {
			switch k {
			case "OLLAMA_URL":
				return "http://127.0.0.1:11435"
			case "APP_VER":
				return appVer
			}
			return ""
		})
	}
	cfg, err := load("")
	if err != nil || cfg.AppVersion != "stable" {
		t.Fatalf("default AppVersion = %q, err %v; want stable", cfg.AppVersion, err)
	}
	for _, v := range []string{"dev", "stable"} {
		if cfg, err := load(v); err != nil || cfg.AppVersion != v {
			t.Fatalf("APP_VER=%s: got %q, err %v", v, cfg.AppVersion, err)
		}
	}
	if cfg, err := load("1.2.3"); err != nil || cfg.AppVersion != "v1.2.3" {
		t.Fatalf("APP_VER=1.2.3: got %q, err %v; want normalized v1.2.3", cfg.AppVersion, err)
	}
	if _, err := load("nightly"); err == nil {
		t.Fatal("APP_VER=nightly: want validation error")
	}
}

func TestParseEnvFile(t *testing.T) {
	input := `# comment
OLLAMA_URL=http://host:11435

LOGLEVEL=debug
SPACED = value with spaces
`
	values, err := ParseEnvFile(strings.NewReader(input))
	if err != nil {
		t.Fatal(err)
	}
	if values["OLLAMA_URL"] != "http://host:11435" {
		t.Fatalf("OLLAMA_URL = %q", values["OLLAMA_URL"])
	}
	if values["LOGLEVEL"] != "debug" {
		t.Fatalf("LOGLEVEL = %q", values["LOGLEVEL"])
	}
	if values["SPACED"] != "value with spaces" {
		t.Fatalf("SPACED = %q", values["SPACED"])
	}
}

func TestParseEnvFileMalformed(t *testing.T) {
	_, err := ParseEnvFile(strings.NewReader("OK=1\nNOT_A_PAIR\n"))
	if err == nil || !strings.Contains(err.Error(), "line 2") {
		t.Fatalf("err = %v, want line 2 error", err)
	}
}

func TestEnvOverridesFile(t *testing.T) {
	file := map[string]string{"OLLAMA_URL": "http://file:1", "UNLOAD_TIMEOUT": "42s"}
	env := map[string]string{"OLLAMA_URL": "http://env:2"}
	getenv := func(k string) string {
		if v := env[k]; v != "" {
			return v
		}
		return file[k]
	}
	cfg, err := Load(getenv)
	if err != nil {
		t.Fatal(err)
	}
	if cfg.OllamaURL != "http://env:2" {
		t.Fatalf("OllamaURL = %q, want env value", cfg.OllamaURL)
	}
	if cfg.UnloadTimeout != 42*time.Second {
		t.Fatalf("UnloadTimeout = %v, want file value", cfg.UnloadTimeout)
	}
}

func TestLoadErrors(t *testing.T) {
	for _, tc := range []struct{ key, value string }{
		{"UNLOAD_TIMEOUT", "bogus"},
		{"PROMPT_CAPTURE_LIMIT", "-5"},
		{"AUTO_UPDATE", "maybe"},
		{"LOGLEVEL", "shouty"},
		{"LOG_FORMAT", "yaml"},
		{"LLM_BUSY_MODE", "bogus"},
		{"LLM_BUSY_STATUS", "200"},
		{"BUSY_RETRY_AFTER", "0"},
	} {
		_, err := Load(func(k string) string {
			if k == tc.key {
				return tc.value
			}
			if k == "OLLAMA_URL" {
				return "http://127.0.0.1:11435"
			}
			return ""
		})
		if err == nil {
			t.Errorf("%s=%s: expected error", tc.key, tc.value)
		}
	}
}