// Copyright (c) 2026 Probo Inc <hello@probo.com>.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

package llm_test

import (
	"testing"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	"go.probo.inc/probo/pkg/llm"
)

func TestRegistry_Lookup(t *testing.T) {
	t.Parallel()

	r := llm.NewRegistry(map[string]llm.ModelDefinition{
		"acme/test-model-1.5": {
			Name:            "Acme: Test Model 1.5",
			ContextLength:   8192,
			MaxOutputTokens: 4096,
			Supports: llm.SupportedParameters{
				Temperature: true,
				Reasoning:   true,
			},
		},
	})

	t.Run(
		"by full id",
		func(t *testing.T) {
			t.Parallel()

			m, ok := r.Lookup("acme/test-model-1.5")
			require.True(t, ok)
			assert.Equal(t, "acme/test-model-1.5", m.ID)
			assert.Equal(t, "acme", m.Provider())
			assert.Equal(t, 8192, m.ContextLength)
			assert.Equal(t, 4096, m.MaxOutputTokens)
		},
	)

	t.Run(
		"by bare name with dots",
		func(t *testing.T) {
			t.Parallel()

			m, ok := r.Lookup("test-model-1.5")
			require.True(t, ok)
			assert.Equal(t, "acme", m.Provider())
		},
	)

	t.Run(
		"by bare name with dashes",
		func(t *testing.T) {
			t.Parallel()

			m, ok := r.Lookup("test-model-1-5")
			require.True(t, ok)
			assert.Equal(t, "acme", m.Provider())
		},
	)

	t.Run(
		"dated snapshot falls back to base model",
		func(t *testing.T) {
			t.Parallel()

			r := llm.NewRegistry(map[string]llm.ModelDefinition{
				"openai/gpt-5-nano": {
					Name: "OpenAI: GPT-5 Nano",
				},
			})

			m, ok := r.Lookup("gpt-5-nano-2025-08-07")
			require.True(t, ok)
			assert.Equal(t, "openai/gpt-5-nano", m.ID)
		},
	)

	t.Run(
		"unknown model returns false",
		func(t *testing.T) {
			t.Parallel()

			_, ok := r.Lookup("nonexistent-model-42")
			assert.False(t, ok)
		},
	)

	t.Run(
		"empty string returns false",
		func(t *testing.T) {
			t.Parallel()

			_, ok := r.Lookup("")
			assert.False(t, ok)
		},
	)

	t.Run(
		"provider prefix only returns false",
		func(t *testing.T) {
			t.Parallel()

			_, ok := r.Lookup("acme/")
			assert.False(t, ok)
		},
	)
}

func TestRegistry_Capabilities(t *testing.T) {
	t.Parallel()

	r := llm.NewRegistry(map[string]llm.ModelDefinition{
		"acme/reasoning-model": {
			Name: "Acme: Reasoning Model",
			Supports: llm.SupportedParameters{
				Reasoning: true,
				Seed:      true,
			},
		},
		"acme/chat-model": {
			Name: "Acme: Chat Model",
			Supports: llm.SupportedParameters{
				Temperature:      true,
				TopP:             true,
				TopK:             true,
				FrequencyPenalty: true,
			},
		},
	})

	t.Run(
		"reasoning model has reasoning and seed but not temperature",
		func(t *testing.T) {
			t.Parallel()

			m, ok := r.Lookup("acme/reasoning-model")
			require.True(t, ok)
			assert.True(t, m.Supports.Reasoning)
			assert.True(t, m.Supports.Seed)
			assert.False(t, m.Supports.Temperature)
			assert.False(t, m.Supports.TopP)
		},
	)

	t.Run(
		"chat model has temperature and penalties but not reasoning",
		func(t *testing.T) {
			t.Parallel()

			m, ok := r.Lookup("acme/chat-model")
			require.True(t, ok)
			assert.True(t, m.Supports.Temperature)
			assert.True(t, m.Supports.TopP)
			assert.True(t, m.Supports.TopK)
			assert.True(t, m.Supports.FrequencyPenalty)
			assert.False(t, m.Supports.Reasoning)
		},
	)
}