package tpl

import (
	"encoding/json"
	"strings"
	"testing"

	"github.com/OliveTin/OliveTin/internal/entities"
	"github.com/stretchr/testify/assert"
)

type parseTemplateJsonTestCase struct {
	name           string
	source         string
	ent            *entities.Entity
	args           map[string]string
	expectedOutput string
	expectError    bool
	checkJsonOnly  bool
}

func assertParseTemplateJsonCase(t *testing.T, tt parseTemplateJsonTestCase, output string, err error) {
	if tt.expectError {
		assert.Error(t, err)
		return
	}
	assert.NoError(t, err)
	if tt.checkJsonOnly {
		prefix := strings.TrimSuffix(tt.expectedOutput, " ")
		assert.True(t, strings.HasPrefix(output, prefix), "output %q should start with %q", output, prefix)
		jsonPart := strings.TrimSpace(strings.TrimPrefix(output, prefix))
		var decoded map[string]string
		err := json.Unmarshal([]byte(jsonPart), &decoded)
		assert.NoError(t, err)
		for k, v := range tt.args {
			assert.Equal(t, v, decoded[k], "decoded JSON should contain %s=%s", k, v)
		}
		assert.Len(t, decoded, len(tt.args))
		return
	}
	assert.Equal(t, tt.expectedOutput, output)
}

func TestParseTemplateWithActionContext_Json(t *testing.T) {
	tests := []parseTemplateJsonTestCase{
		{
			name:           "Arguments piped to Json",
			source:         `echo {{ .Arguments | Json }}`,
			ent:            nil,
			args:           map[string]string{"value": "true", "ot_username": "alice"},
			expectedOutput: `echo `,
			expectError:    false,
			checkJsonOnly:  true,
		},
		{
			name:           "CurrentEntity field piped to Json",
			source:         `curl -d {{ .CurrentEntity.foo.bar | Json }}`,
			ent:            &entities.Entity{Data: map[string]any{"foo": map[string]any{"bar": "baz"}}},
			args:           nil,
			expectedOutput: `curl -d "baz"`,
			expectError:    false,
		},
		{
			name:           "CurrentEntity nested object piped to Json",
			source:         `curl --json -d {{ .CurrentEntity.payload | Json }}`,
			ent:            &entities.Entity{Data: map[string]any{"payload": map[string]any{"on": true}}},
			args:           nil,
			expectedOutput: `curl --json -d {"on":true}`,
			expectError:    false,
		},
		{
			name:           "Single argument value as Json",
			source:         `echo {{ .Arguments.value | Json }}`,
			ent:            nil,
			args:           map[string]string{"value": "hello"},
			expectedOutput: `echo "hello"`,
			expectError:    false,
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			output, err := ParseTemplateWithActionContext(tt.source, tt.ent, tt.args)
			assertParseTemplateJsonCase(t, tt, output, err)
		})
	}
}