package builtin

import (
	"context"
	"errors"
	"io/fs"
	"strings"
	"testing"

	"gitea.maximumdirect.net/eric/promptkit/internal/domain"
	"gitea.maximumdirect.net/eric/promptkit/internal/profile"
	"gopkg.in/yaml.v3"
)

func TestBuiltInProfilesValidateThroughRepository(t *testing.T) {
	repo := NewRepository()
	ids := loadBuiltInProfileIDs(t)
	if len(ids) == 0 {
		t.Fatal("expected built-in profiles")
	}

	for id := range ids {
		t.Run(id, func(t *testing.T) {
			p, err := repo.GetProfile(context.Background(), id)
			if err != nil {
				t.Fatalf("expected built-in profile %q to load, got %v", id, err)
			}
			if p.ID != id {
				t.Fatalf("expected profile id %q, got %q", id, p.ID)
			}
		})
	}
}

func TestBuiltInProfilesDoNotContainDuplicateIDsOrRawAPIKeys(t *testing.T) {
	loadBuiltInProfileIDs(t)
}

func loadBuiltInProfileIDs(t *testing.T) map[string]string {
	t.Helper()

	ids := map[string]string{}
	err := fs.WalkDir(assets, assetRoot, func(name string, d fs.DirEntry, err error) error {
		if err != nil {
			return err
		}
		if d.IsDir() || !strings.HasSuffix(name, ".yml") {
			return nil
		}

		data, err := assets.ReadFile(name)
		if err != nil {
			t.Fatalf("failed to read built-in profile %s: %v", name, err)
		}

		var raw map[string]any
		if err := yaml.Unmarshal(data, &raw); err != nil {
			t.Fatalf("failed to decode built-in profile %s: %v", name, err)
		}
		if _, ok := raw["api_key"]; ok {
			t.Fatalf("built-in profile %s contains raw api_key", name)
		}
		id, ok := raw["id"].(string)
		if !ok || strings.TrimSpace(id) == "" {
			t.Fatalf("built-in profile %s has missing id", name)
		}
		if previous, ok := ids[id]; ok {
			t.Fatalf("duplicate built-in profile id %q in %s and %s", id, previous, name)
		}
		ids[id] = name
		return nil
	})
	if err != nil {
		t.Fatalf("failed to walk built-in profiles: %v", err)
	}
	return ids
}

func TestRepositoryWithPrimaryUsesPrimaryBeforeBuiltIns(t *testing.T) {
	repo := NewRepositoryWithPrimary(staticProfileRepo{
		profiles: map[string]string{"mistral-small-3": "custom-model"},
	})

	p, err := repo.GetProfile(context.Background(), "mistral-small-3")
	if err != nil {
		t.Fatalf("expected profile to load, got %v", err)
	}
	if p.Model != "custom-model" {
		t.Fatalf("expected primary profile to override built-in, got %+v", p)
	}
}

func TestRepositoryWithPrimaryFallsBackToBuiltIns(t *testing.T) {
	repo := NewRepositoryWithPrimary(staticProfileRepo{})

	p, err := repo.GetProfile(context.Background(), "mistral-small-3")
	if err != nil {
		t.Fatalf("expected built-in profile to load, got %v", err)
	}
	if p.ID != "mistral-small-3" {
		t.Fatalf("unexpected profile: %+v", p)
	}
}

func TestRepositoryWithPrimaryDoesNotFallBackAfterPrimaryError(t *testing.T) {
	repo := NewRepositoryWithPrimary(staticProfileRepo{err: profile.ErrInvalidProfile})

	_, err := repo.GetProfile(context.Background(), "mistral-small-3")
	if !errors.Is(err, profile.ErrInvalidProfile) {
		t.Fatalf("expected primary error, got %v", err)
	}
}

type staticProfileRepo struct {
	profiles map[string]string
	err      error
}

func (r staticProfileRepo) GetProfile(_ context.Context, id string) (*domain.ExecutionProfile, error) {
	if r.err != nil {
		return nil, r.err
	}
	if model, ok := r.profiles[id]; ok {
		return &domain.ExecutionProfile{ID: id, Endpoint: "http://primary/v1", Model: model}, nil
	}
	return nil, profile.ErrProfileNotFound
}