package ollama

import (
	"context"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"testing"
)

func TestIsThinkingModel(t *testing.T) {
	tests := []struct {
		name string
		want bool
	}{
		{name: "qwen3", want: true},
		{name: "qwen3:4b", want: true},
		{name: "qwen3:latest", want: true},
		{name: "llama3", want: false},
		{name: "mistral", want: false},
	}
	for _, tt := range tests {
		if got := isThinkingModel(tt.name); got != tt.want {
			t.Fatalf("isThinkingModel(%q) = %v, want %v", tt.name, got, tt.want)
		}
	}
}

func TestGenerateSetsThinkForQwen3(t *testing.T) {
	var body map[string]any
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if err := json.NewDecoder(r.Body).Decode(&body); err != nil {
			t.Fatalf("Decode() error = %v", err)
		}
		_, _ = w.Write([]byte(`{"response":"ok"}`))
	}))
	defer srv.Close()

	client := New(srv.URL, srv.Client())
	if _, err := client.Generate(context.Background(), "qwen3:latest", "prompt"); err != nil {
		t.Fatalf("Generate() error = %v", err)
	}
	if body["think"] != false {
		t.Fatalf("think = %#v, want false", body["think"])
	}
}

func TestGenerateOmitsThinkForLlama3(t *testing.T) {
	var body map[string]any
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if err := json.NewDecoder(r.Body).Decode(&body); err != nil {
			t.Fatalf("Decode() error = %v", err)
		}
		_, _ = w.Write([]byte(`{"response":"ok"}`))
	}))
	defer srv.Close()

	client := New(srv.URL, srv.Client())
	if _, err := client.Generate(context.Background(), "llama3:latest", "prompt"); err != nil {
		t.Fatalf("Generate() error = %v", err)
	}
	if _, ok := body["think"]; ok {
		t.Fatalf("unexpected think key = %#v", body["think"])
	}
}

func TestListModelsReturnsNamesOnly(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		_, _ = w.Write([]byte(`{"models":[{"name":"llama3:latest"},{"name":"qwen3:latest"}]}`))
	}))
	defer srv.Close()

	client := New(srv.URL, srv.Client())
	got, err := client.ListModels(context.Background())
	if err != nil {
		t.Fatalf("ListModels() error = %v", err)
	}
	if len(got) != 2 || got[0] != "llama3:latest" || got[1] != "qwen3:latest" {
		t.Fatalf("ListModels() = %#v", got)
	}
}