package preset

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

func TestLoadUsesBuiltInDefaultsWithoutWritingConfig(t *testing.T) {
	configHome := filepath.Join(t.TempDir(), "config")
	t.Setenv("XDG_CONFIG_HOME", configHome)

	set, err := Load()
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if _, err := os.Stat(filepath.Join(configHome, "patterm")); !os.IsNotExist(err) {
		t.Fatalf("Load created config dir or unexpected stat error: %v", err)
	}
	if len(set.Agents) != 3 {
		t.Fatalf("agents len = %d, want 3", len(set.Agents))
	}
	claude := presetByName(set.Agents, "claude")
	if claude == nil {
		t.Fatal("missing built-in claude preset")
	}
	if claude.IdleDetection == nil || len(claude.IdleDetection.PermissionPatterns) == 0 {
		t.Fatalf("built-in claude missing permission patterns: %+v", claude.IdleDetection)
	}
	codex := presetByName(set.Agents, "codex")
	if codex == nil {
		t.Fatal("missing built-in codex preset")
	}
	if codex.IdleDetection == nil || len(codex.IdleDetection.ThinkingPatterns) == 0 {
		t.Fatalf("built-in codex missing thinking patterns: %+v", codex.IdleDetection)
	}
}

func TestLoadMergesUserOverlayIntoBuiltInPreset(t *testing.T) {
	configHome := t.TempDir()
	t.Setenv("XDG_CONFIG_HOME", configHome)
	dir := filepath.Join(configHome, "patterm", "presets", "agents")
	if err := os.MkdirAll(dir, 0o700); err != nil {
		t.Fatal(err)
	}
	writeFile(t, filepath.Join(dir, "claude.json"), `{
  "name": "claude",
  "argv": ["claude", "--model", "sonnet"],
  "idle_detection": { "idle_threshold_ms": 3500 }
}`)

	set, err := Load()
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	claude := presetByName(set.Agents, "claude")
	if claude == nil {
		t.Fatal("missing claude preset")
	}
	if got := claude.Argv; len(got) != 3 || got[0] != "claude" || got[2] != "sonnet" {
		t.Fatalf("argv = %#v", got)
	}
	if claude.IdleDetection.IdleThresholdMS != 3500 {
		t.Fatalf("idle threshold = %d", claude.IdleDetection.IdleThresholdMS)
	}
	if len(claude.IdleDetection.PermissionPatterns) == 0 {
		t.Fatalf("permission patterns were not inherited: %+v", claude.IdleDetection)
	}
	if claude.MCPInjection == nil || claude.MCPInjection.Kind != "flag" {
		t.Fatalf("mcp injection was not inherited: %+v", claude.MCPInjection)
	}
}

func TestLoadCanDisableBuiltInPreset(t *testing.T) {
	configHome := t.TempDir()
	t.Setenv("XDG_CONFIG_HOME", configHome)
	dir := filepath.Join(configHome, "patterm", "presets", "agents")
	if err := os.MkdirAll(dir, 0o700); err != nil {
		t.Fatal(err)
	}
	writeFile(t, filepath.Join(dir, "opencode.json"), `{"name":"opencode","disabled":true}`)

	set, err := Load()
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if presetByName(set.Agents, "opencode") != nil {
		t.Fatal("opencode preset was not disabled")
	}
	if presetByName(set.Agents, "claude") == nil || presetByName(set.Agents, "codex") == nil {
		t.Fatalf("other built-ins missing: %+v", set.Agents)
	}
}

func TestLoadAddsCustomUserPreset(t *testing.T) {
	configHome := t.TempDir()
	t.Setenv("XDG_CONFIG_HOME", configHome)
	dir := filepath.Join(configHome, "patterm", "presets", "processes")
	if err := os.MkdirAll(dir, 0o700); err != nil {
		t.Fatal(err)
	}
	writeFile(t, filepath.Join(dir, "test.json"), `{"name":"test","argv":["go","test","./..."]}`)

	set, err := Load()
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	proc := presetByName(set.Processes, "test")
	if proc == nil {
		t.Fatal("missing custom process preset")
	}
	if proc.Kind != KindCommand {
		t.Fatalf("kind = %q", proc.Kind)
	}
}

func presetByName(ps []*Preset, name string) *Preset {
	for _, p := range ps {
		if p.Name == name {
			return p
		}
	}
	return nil
}

func writeFile(t *testing.T, path, body string) {
	t.Helper()
	if err := os.WriteFile(path, []byte(body), 0o600); err != nil {
		t.Fatal(err)
	}
}