package promptkit_test

import (
	"bytes"
	"context"
	"encoding/json"
	"errors"
	"strings"
	"testing"

	"go.maximumdirect.net/configkit"
	"go.maximumdirect.net/promptkit"
)

func TestProgrammaticSourcesPreserveOrderAndRejectDuplicates(t *testing.T) {
	endpoint := "https://example.invalid/v1"
	params := map[string]any{"visible": "original"}
	backendSource := promptkit.BackendSource("backends", []promptkit.BackendConfig{
		{ID: "zeta", Endpoint: &endpoint, ExtraParams: params}, {ID: "alpha", Endpoint: &endpoint},
	})
	profileSource := promptkit.ProfileSource("profiles", []promptkit.ProfileConfig{
		{ID: "zeta", ExtraParams: params}, {ID: "alpha"},
	})
	params["visible"] = "changed"
	engine, err := promptkit.NewEngine(promptkit.Config{Sources: promptkit.ConfigurationSources{
		Underlays: []configkit.Underlay{{Inputs: []configkit.Input{{Source: backendSource}, {Source: profileSource}}}},
	}}, promptkit.WithBundledOpenRouter(false))
	if err != nil {
		t.Fatal(err)
	}
	view, err := engine.InspectConfiguration()
	if err != nil {
		t.Fatal(err)
	}
	var report bytes.Buffer
	if err := view.WriteEffective(&report); err != nil {
		t.Fatal(err)
	}
	contents := report.String()
	if strings.Count(contents, "original") != 2 || strings.Contains(contents, "changed") {
		t.Fatalf("source ownership was lost: %s", contents)
	}
	for _, kind := range []string{"backends", "profiles"} {
		for index, id := range []string{"zeta", "alpha"} {
			entry, found := view.Explain(configkit.Keys(kind).Index(index).Key("id"))
			if !found || !strings.Contains(entry.Effective.YAML, id) {
				t.Fatalf("%s entry %d = %+v, want %s", kind, index, entry, id)
			}
		}
	}
	for _, source := range []configkit.Source{
		promptkit.BackendSource("duplicate backends", []promptkit.BackendConfig{{ID: "duplicate", Endpoint: &endpoint}, {ID: "duplicate", Endpoint: &endpoint}}),
		promptkit.ProfileSource("duplicate profiles", []promptkit.ProfileConfig{{ID: "duplicate"}, {ID: "duplicate"}}),
	} {
		_, err := promptkit.NewEngine(promptkit.Config{Sources: promptkit.ConfigurationSources{Main: &configkit.Input{Source: source}}})
		if !errors.Is(err, promptkit.ErrInvalidConfig) {
			t.Fatalf("duplicate source error = %v, want ErrInvalidConfig", err)
		}
	}
}

func TestProgrammaticProfileVariantInherits(t *testing.T) {
	parent, endpoint, model, timeout := "base", "https://example.invalid/v1", "synthetic-model", 15
	source := promptkit.ProfileSource("profiles", []promptkit.ProfileConfig{
		{ID: parent, Endpoint: &endpoint, Model: &model},
		{ID: "child", Extends: &parent, TimeoutSeconds: &timeout},
	})
	engine, err := promptkit.NewEngine(promptkit.Config{Sources: promptkit.ConfigurationSources{Main: &configkit.Input{Source: source}}})
	if err != nil {
		t.Fatal(err)
	}
	profile, err := engine.InspectProfile(context.Background(), "child")
	if err != nil || profile.EffectiveModelParams.Model != model || profile.EffectiveModelParams.Endpoint != endpoint || profile.EffectiveModelParams.TimeoutSeconds != timeout {
		t.Fatalf("inherited profile = %+v, %v", profile, err)
	}
}

func TestProgrammaticSourcesCaptureNestedValuesAndDeferInvalidValues(t *testing.T) {
	endpoint := "https://example.invalid/v1"
	type namedString string
	cyclic := map[string]any{}
	cyclic["self"] = cyclic
	for _, kind := range []string{"backend", "profile"} {
		makeSource := func(params map[string]any) configkit.Source {
			if kind == "backend" {
				return promptkit.BackendSource("backend", []promptkit.BackendConfig{{ID: "local", Endpoint: &endpoint, ExtraParams: params}})
			}
			return promptkit.ProfileSource("profile", []promptkit.ProfileConfig{{ID: "local", ExtraParams: params}})
		}
		load := func(source configkit.Source) (*promptkit.Engine, error) {
			return promptkit.NewEngine(promptkit.Config{Sources: promptkit.ConfigurationSources{Main: &configkit.Input{Source: source}}}, promptkit.WithBundledOpenRouter(false))
		}
		t.Run(kind+"/capture", func(t *testing.T) {
			values := map[string]any{"nested": map[string]any{"items": []any{"original", int64(42), true, nil}}}
			source := makeSource(values)
			values["nested"].(map[string]any)["items"].([]any)[0] = "mutated"
			engine, err := load(source)
			if err != nil {
				t.Fatal(err)
			}
			view, err := engine.InspectConfiguration()
			if err != nil {
				t.Fatal(err)
			}
			var output bytes.Buffer
			if err := view.WriteEffective(&output); err != nil {
				t.Fatal(err)
			}
			if !strings.Contains(output.String(), "original") || strings.Contains(output.String(), "mutated") {
				t.Fatalf("captured configuration = %s", output.String())
			}
		})
		for name, value := range map[string]any{"number": json.Number("1.25"), "typed slice": []string{"value"}, "named scalar": namedString("value"), "pointer": &endpoint, "cycle": cyclic} {
			t.Run(kind+"/"+name, func(t *testing.T) {
				source := makeSource(map[string]any{"value": value})
				_, err := load(source)
				var loadErr *configkit.LoadError
				if !errors.As(err, &loadErr) || len(loadErr.Diagnostics()) == 0 {
					t.Fatalf("source error = %v", err)
				}
			})
		}
	}
}