package provider

import (
	"strings"
	"testing"
)

func TestLoadConfig_valid(t *testing.T) {
	t.Parallel()
	data := []byte(`
providers:
  - name: kubernetes
    type: kubernetes
    kubernetes:
      image: ubuntu/squid:6.6-24.04_edge
  - name: gcp-eu
    type: gcp
    gcp:
      project: my-project
      network: custom-net
`)
	cfg, err := LoadConfig(data)
	if err != nil {
		t.Fatalf("LoadConfig() error = %v, want nil", err)
	}
	if len(cfg.Providers) != 2 {
		t.Fatalf("len(cfg.Providers) = %d, want 2", len(cfg.Providers))
	}
	if cfg.Providers[0].Kubernetes == nil || cfg.Providers[0].Kubernetes.Image != "ubuntu/squid:6.6-24.04_edge" {
		t.Errorf("providers[0].kubernetes = %+v, want Image=ubuntu/squid:6.6-24.04_edge", cfg.Providers[0].Kubernetes)
	}
	if cfg.Providers[1].GCP == nil || cfg.Providers[1].GCP.Project != "my-project" {
		t.Errorf("providers[1].gcp = %+v, want Project=my-project", cfg.Providers[1].GCP)
	}
}

func TestLoadConfig_invalid(t *testing.T) {
	t.Parallel()
	tests := []struct {
		name       string
		yaml       string
		wantErrSub string
	}{
		{
			name:       "empty providers list",
			yaml:       `providers: []`,
			wantErrSub: "at least one provider",
		},
		{
			name: "missing name",
			yaml: `
providers:
  - type: kubernetes`,
			wantErrSub: "name is required",
		},
		{
			name: "duplicate name",
			yaml: `
providers:
  - name: kubernetes
    type: kubernetes
  - name: kubernetes
    type: kubernetes`,
			wantErrSub: "duplicate provider name",
		},
		{
			name: "unknown type",
			yaml: `
providers:
  - name: p1
    type: azure`,
			wantErrSub: `unknown provider type "azure"`,
		},
		{
			name: "missing type",
			yaml: `
providers:
  - name: p1`,
			wantErrSub: "type is required",
		},
		{
			name: "gcp missing project",
			yaml: `
providers:
  - name: gcp-eu
    type: gcp`,
			wantErrSub: "gcp.project is required",
		},
		{
			name: "gcp with empty project",
			yaml: `
providers:
  - name: gcp-eu
    type: gcp
    gcp:
      project: ""`,
			wantErrSub: "gcp.project is required",
		},
		{
			name: "kubernetes type with gcp block",
			yaml: `
providers:
  - name: p1
    type: kubernetes
    gcp:
      project: my-project`,
			wantErrSub: "type is kubernetes but a gcp block is set",
		},
		{
			name: "gcp type with kubernetes block",
			yaml: `
providers:
  - name: p1
    type: gcp
    gcp:
      project: my-project
    kubernetes:
      image: custom-image`,
			wantErrSub: "type is gcp but a kubernetes block is set",
		},
		{
			name: "strict mode rejects unknown top-level key",
			yaml: `
providers:
  - name: p1
    type: kubernetes
extraneous: true`,
			wantErrSub: "parsing providers config",
		},
		{
			name: "strict mode rejects unknown provider key",
			yaml: `
providers:
  - name: p1
    type: kubernetes
    bogus: true`,
			wantErrSub: "parsing providers config",
		},
	}
	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			t.Parallel()
			_, err := LoadConfig([]byte(tc.yaml))
			if err == nil {
				t.Fatalf("LoadConfig() error = nil, want error containing %q", tc.wantErrSub)
			}
			if !strings.Contains(err.Error(), tc.wantErrSub) {
				t.Errorf("LoadConfig() error = %q, want substring %q", err.Error(), tc.wantErrSub)
			}
		})
	}
}

func TestLoadConfigFile_missingFile(t *testing.T) {
	t.Parallel()
	_, err := LoadConfigFile("/nonexistent/providers.yaml")
	if err == nil {
		t.Fatal("LoadConfigFile() error = nil, want error")
	}
	if !strings.Contains(err.Error(), "reading providers config") {
		t.Errorf("LoadConfigFile() error = %q, want substring %q", err.Error(), "reading providers config")
	}
}