package app

import (
	"testing"

	"github.com/stretchr/testify/require"
)

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

	testCases := []struct {
		name    string
		content string
		schema  KolSchemaJSON
		values  map[string]any
		want    string
		wantErr string
	}{
		{
			name:    "success",
			content: "Hello {{var_a}} from {{var_b}}",
			schema: KolSchemaJSON{
				Variables: []KolVariableDefinition{
					{ID: "var_a", Key: "brand", Type: KolVariableTypeInput, Required: true},
					{ID: "var_b", Key: "industry", Type: KolVariableTypeSelect},
				},
			},
			values: map[string]any{
				"var_a": "宜家",
				"var_b": "家具",
			},
			want: "Hello 宜家 from 家具",
		},
		{
			name:    "supports key placeholders and key values",
			content: "围绕 {{目标词}} 写一篇文章，并突出 {{目标词}} 的优势",
			schema: KolSchemaJSON{
				Variables: []KolVariableDefinition{
					{ID: "var_a", Key: "目标词", Label: "目标词", Type: KolVariableTypeInput, Required: true},
				},
			},
			values: map[string]any{
				"目标词": "北京装修公司",
			},
			want: "围绕 北京装修公司 写一篇文章，并突出 北京装修公司 的优势",
		},
		{
			name:    "supports key placeholders with id values",
			content: "Hello {{brand}}",
			schema: KolSchemaJSON{
				Variables: []KolVariableDefinition{
					{ID: "var_a", Key: "brand", Label: "Brand", Type: KolVariableTypeInput, Required: true},
				},
			},
			values: map[string]any{
				"var_a": "宜家",
			},
			want: "Hello 宜家",
		},
		{
			name:    "missing required",
			content: "Hello {{var_required}}",
			schema: KolSchemaJSON{
				Variables: []KolVariableDefinition{
					{ID: "var_required", Key: "required", Label: "Required", Type: KolVariableTypeInput, Required: true},
				},
			},
			values:  map[string]any{},
			wantErr: "missing variables",
		},
		{
			name:    "uses default text value when missing",
			content: "Hello {{city}}",
			schema: KolSchemaJSON{
				Variables: []KolVariableDefinition{
					{ID: "var_city", Key: "city", Label: "城市", Type: KolVariableTypeInput, Required: true, DefaultValue: stringPtr("合肥")},
				},
			},
			values: map[string]any{},
			want:   "Hello 合肥",
		},
		{
			name:    "rejects text exceeding max length",
			content: "Topic: {{topic}}",
			schema: KolSchemaJSON{
				Variables: []KolVariableDefinition{
					{ID: "var_topic", Key: "topic", Label: "主题", Type: KolVariableTypeInput, Required: true, MaxLength: intPtr(4)},
				},
			},
			values:  map[string]any{"topic": "超过四个字"},
			wantErr: "exceeds max length",
		},
		{
			name:    "rejects number outside configured range",
			content: "Top {{count}} results",
			schema: KolSchemaJSON{
				Variables: []KolVariableDefinition{
					{ID: "var_count", Key: "count", Label: "数量", Type: KolVariableTypeNumber, Required: true, MinValue: float64Ptr(1), MaxValue: float64Ptr(5)},
				},
			},
			values:  map[string]any{"count": 6},
			wantErr: "must be between 1 and 5",
		},
	}

	for _, tc := range testCases {
		tc := tc
		t.Run(tc.name, func(t *testing.T) {
			t.Parallel()

			rendered, err := RenderPrompt(tc.content, tc.schema, tc.values)
			if tc.wantErr != "" {
				require.Error(t, err)
				require.Contains(t, err.Error(), tc.wantErr)
				return
			}

			require.NoError(t, err)
			require.Equal(t, tc.want, rendered)
		})
	}
}

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

	require.Equal(t, HashPrompt("abc"), HashPrompt("abc"))
	require.NotEqual(t, HashPrompt("abc"), HashPrompt("abd"))
}

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

	err := ValidateSchema(KolSchemaJSON{
		Variables: []KolVariableDefinition{
			{ID: "var_a", Key: "first", Type: KolVariableTypeInput},
			{ID: "var_a", Key: "second", Type: KolVariableTypeSelect},
		},
	})

	require.Error(t, err)
	require.Contains(t, err.Error(), "duplicate variable id")
}

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

	err := ValidateSchema(KolSchemaJSON{
		Variables: []KolVariableDefinition{
			{ID: "bad_id", Key: "bad", Type: KolVariableTypeInput},
		},
	})

	require.Error(t, err)
	require.Contains(t, err.Error(), "start with var_")
}

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

	err := ValidateSchema(KolSchemaJSON{
		Variables: []KolVariableDefinition{
			{ID: "var_a", Key: "topic", Type: KolVariableTypeInput},
			{ID: "var_b", Key: "topic", Type: KolVariableTypeSelect},
		},
	})

	require.Error(t, err)
	require.Contains(t, err.Error(), "duplicate variable key")
}

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

	err := ValidateSchema(KolSchemaJSON{
		Variables: []KolVariableDefinition{
			{ID: "var_topic", Key: "topic", Label: "主题", Type: KolVariableTypeInput, MaxLength: intPtr(2), DefaultValue: stringPtr("过长默认值")},
		},
	})

	require.Error(t, err)
	require.Contains(t, err.Error(), "default value exceeds max length")
}

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

	err := ValidateSchema(KolSchemaJSON{
		Variables: []KolVariableDefinition{
			{ID: "var_count", Key: "count", Label: "数量", Type: KolVariableTypeNumber, MinValue: float64Ptr(10), MaxValue: float64Ptr(5)},
		},
	})

	require.Error(t, err)
	require.Contains(t, err.Error(), "max value must be greater than or equal to min value")
}

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

	err := ValidateSchema(KolSchemaJSON{
		Variables: []KolVariableDefinition{
			{ID: "var_count", Key: "count", Label: "数量", Type: KolVariableTypeNumber, MinValue: float64Ptr(1), MaxValue: float64Ptr(5), DefaultNumber: float64Ptr(6)},
		},
	})

	require.Error(t, err)
	require.Contains(t, err.Error(), "default number must be between 1 and 5")
}

func stringPtr(value string) *string {
	return &value
}