package glm4_moe_lite

import (
	"testing"

	"github.com/ollama/ollama/api"
)

func TestParserThinking(t *testing.T) {
	tests := []struct {
		name          string
		input         string
		thinkEnabled  bool
		wantContent   string
		wantThinking  string
		wantToolCalls int
	}{
		{
			name:         "thinking enabled - simple thinking then content",
			input:        "Let me think about this...</think>Here is my answer.",
			thinkEnabled: true,
			wantThinking: "Let me think about this...",
			wantContent:  "Here is my answer.",
		},
		{
			name:         "thinking enabled - only thinking",
			input:        "I need to consider multiple factors...",
			thinkEnabled: true,
			wantThinking: "I need to consider multiple factors...",
			wantContent:  "",
		},
		{
			name:         "thinking disabled - direct content",
			input:        "Here is my direct answer.",
			thinkEnabled: false,
			wantThinking: "",
			wantContent:  "Here is my direct answer.",
		},
		{
			name:          "thinking with tool call",
			input:         "Let me search for that...</think>I'll use a tool.<tool_call>search<arg_key>query</arg_key><arg_value>test</arg_value></tool_call>",
			thinkEnabled:  true,
			wantThinking:  "Let me search for that...",
			wantContent:   "I'll use a tool.",
			wantToolCalls: 1,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			p := &Parser{}

			var thinkValue *api.ThinkValue
			if tt.thinkEnabled {
				thinkValue = &api.ThinkValue{Value: true}
			} else {
				thinkValue = &api.ThinkValue{Value: false}
			}

			// Define tools for tool call tests
			props := api.NewToolPropertiesMap()
			props.Set("query", api.ToolProperty{Type: api.PropertyType{"string"}})
			tools := []api.Tool{
				{
					Function: api.ToolFunction{
						Name: "search",
						Parameters: api.ToolFunctionParameters{
							Properties: props,
						},
					},
				},
			}

			p.Init(tools, nil, thinkValue)

			content, thinking, calls, err := p.Add(tt.input, true)
			if err != nil {
				t.Fatalf("unexpected error: %v", err)
			}

			if thinking != tt.wantThinking {
				t.Errorf("thinking = %q, want %q", thinking, tt.wantThinking)
			}
			if content != tt.wantContent {
				t.Errorf("content = %q, want %q", content, tt.wantContent)
			}
			if len(calls) != tt.wantToolCalls {
				t.Errorf("len(calls) = %d, want %d", len(calls), tt.wantToolCalls)
			}
		})
	}
}

func TestParserToolCall(t *testing.T) {
	p := &Parser{}

	props := api.NewToolPropertiesMap()
	props.Set("location", api.ToolProperty{Type: api.PropertyType{"string"}})
	props.Set("unit", api.ToolProperty{Type: api.PropertyType{"string"}})
	tools := []api.Tool{
		{
			Function: api.ToolFunction{
				Name: "get_weather",
				Parameters: api.ToolFunctionParameters{
					Properties: props,
				},
			},
		},
	}

	// Initialize with thinking disabled
	tv := &api.ThinkValue{Value: false}
	p.Init(tools, nil, tv)

	input := "<tool_call>get_weather<arg_key>location</arg_key><arg_value>San Francisco</arg_value><arg_key>unit</arg_key><arg_value>celsius</arg_value></tool_call>"

	_, _, calls, err := p.Add(input, true)
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}

	if len(calls) != 1 {
		t.Fatalf("expected 1 tool call, got %d", len(calls))
	}

	call := calls[0]
	if call.Function.Name != "get_weather" {
		t.Errorf("function name = %q, want %q", call.Function.Name, "get_weather")
	}

	location, ok := call.Function.Arguments.Get("location")
	if !ok || location != "San Francisco" {
		t.Errorf("location = %v, want %q", location, "San Francisco")
	}

	unit, ok := call.Function.Arguments.Get("unit")
	if !ok || unit != "celsius" {
		t.Errorf("unit = %v, want %q", unit, "celsius")
	}
}

func TestOverlap(t *testing.T) {
	tests := []struct {
		s    string
		tag  string
		want int
	}{
		{"hello<", "</think>", 1},
		{"hello</", "</think>", 2},
		{"hello</t", "</think>", 3},
		{"hello</th", "</think>", 4},
		{"hello</thi", "</think>", 5},
		{"hello</thin", "</think>", 6},
		{"hello</think", "</think>", 7},
		{"hello</think>", "</think>", 8}, // Complete tag at end returns full length
		{"hello", "</think>", 0},
		{"", "</think>", 0},
	}

	for _, tt := range tests {
		t.Run(tt.s+"_"+tt.tag, func(t *testing.T) {
			got := overlap(tt.s, tt.tag)
			if got != tt.want {
				t.Errorf("overlap(%q, %q) = %d, want %d", tt.s, tt.tag, got, tt.want)
			}
		})
	}
}

func TestTrailingWhitespaceLen(t *testing.T) {
	tests := []struct {
		s    string
		want int
	}{
		{"hello   ", 3},
		{"hello\n\t ", 3},
		{"hello", 0},
		{"", 0},
		{"   ", 3},
	}

	for _, tt := range tests {
		t.Run(tt.s, func(t *testing.T) {
			got := trailingWhitespaceLen(tt.s)
			if got != tt.want {
				t.Errorf("trailingWhitespaceLen(%q) = %d, want %d", tt.s, got, tt.want)
			}
		})
	}
}