package meteo_test

import (
	"os"
	"servicea/internal/domains/meteo"
	"testing"
	"time"

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

func Test_CSV_ParseFile(t *testing.T) {
	tests := []struct {
		name             string
		filePath         string
		expectedInserted int
		expectedRejected int
		expectError      bool
		validateInserted func(t *testing.T, inserted []meteo.MeteoData)
		validateRejected func(t *testing.T, rejected []meteo.RejectedMeteoData)
	}{
		{
			name:             "valid record",
			filePath:         "./../../../assets/test_1.csv",
			expectedInserted: 1,
			expectedRejected: 0,
			validateInserted: func(t *testing.T, inserted []meteo.MeteoData) {
				assert.Equal(t, 1, len(inserted))
				record := inserted[0]
				assert.Equal(t, time.Date(2025, 10, 12, 0, 0, 0, 0, time.UTC), record.Timestamp)
				assert.Equal(t, "Madrid", record.Location)
				assert.Equal(t, float32(11.55), record.MaxTemp)
				assert.Equal(t, float32(6.25), record.MinTemp)
				assert.Equal(t, float32(0), record.Rainfall)
				assert.Equal(t, float32(10), record.Cloudiness)
			},
			validateRejected: func(t *testing.T, rejected []meteo.RejectedMeteoData) {
				assert.Empty(t, rejected)
			},
		},
		{
			name:             "record with leading spaces",
			filePath:         "./../../../assets/test_2.csv",
			expectedInserted: 1,
			expectedRejected: 0,
			validateInserted: func(t *testing.T, inserted []meteo.MeteoData) {
				assert.Equal(t, 1, len(inserted))
				assert.Equal(t, "Madrid", inserted[0].Location)
			},
			validateRejected: func(t *testing.T, rejected []meteo.RejectedMeteoData) {
				assert.Empty(t, rejected)
			},
		},
		{
			name:             "missing city column",
			filePath:         "./../../../assets/test_3.csv",
			expectedInserted: 0,
			expectedRejected: 1,
			validateInserted: func(t *testing.T, inserted []meteo.MeteoData) {
				assert.Empty(t, inserted)
			},
			validateRejected: func(t *testing.T, rejected []meteo.RejectedMeteoData) {
				assert.Equal(t, 1, len(rejected))
				assert.Contains(t, rejected[0].Reason, "missing or invalid city field")
				assert.Equal(t, "2025/10/12;11,55;6,25;0;10", rejected[0].RowValue)
			},
		},
		{
			name:             "empty file with only header",
			filePath:         "./../../../assets/test_4.csv",
			expectedInserted: 0,
			expectedRejected: 0,
			validateInserted: func(t *testing.T, inserted []meteo.MeteoData) {
				assert.Empty(t, inserted)
			},
			validateRejected: func(t *testing.T, rejected []meteo.RejectedMeteoData) {
				assert.Empty(t, rejected)
			},
		},
		{
			name:             "missing max temp field value",
			filePath:         "./../../../assets/test_5.csv",
			expectedInserted: 0,
			expectedRejected: 1,
			validateInserted: func(t *testing.T, inserted []meteo.MeteoData) {
				assert.Empty(t, inserted)
			},
			validateRejected: func(t *testing.T, rejected []meteo.RejectedMeteoData) {
				assert.Equal(t, 1, len(rejected))
				assert.Contains(t, rejected[0].Reason, "missing or invalid max temp field")
				assert.Equal(t, "2025/10/12;Madrid;;6,25;0;10", rejected[0].RowValue)
			},
		},
		{
			name:             "missing city field value",
			filePath:         "./../../../assets/test_6.csv",
			expectedInserted: 0,
			expectedRejected: 1,
			validateInserted: func(t *testing.T, inserted []meteo.MeteoData) {
				assert.Empty(t, inserted)
			},
			validateRejected: func(t *testing.T, rejected []meteo.RejectedMeteoData) {
				assert.Equal(t, 1, len(rejected))
				assert.Contains(t, rejected[0].Reason, "missing or invalid city field")
				assert.Equal(t, "2025/10/12;;11,55;6,25;0;10", rejected[0].RowValue)
			},
		},
		{
			name:             "missing date field value",
			filePath:         "./../../../assets/test_7.csv",
			expectedInserted: 0,
			expectedRejected: 1,
			expectError:      false,
			validateInserted: func(t *testing.T, inserted []meteo.MeteoData) {
				assert.Empty(t, inserted)
			},
			validateRejected: func(t *testing.T, rejected []meteo.RejectedMeteoData) {
				assert.Equal(t, 1, len(rejected))
				assert.Contains(t, rejected[0].Reason, "missing or invalid date field")
				assert.Equal(t, ";Madrid;11,55;6,25;0;10", rejected[0].RowValue)
			},
		},
		{
			name:             "invalid separator comma instead of semicolon",
			filePath:         "./../../../assets/test_8.csv",
			expectedInserted: 0,
			expectedRejected: 0,
			expectError:      true,
			validateInserted: nil,
			validateRejected: nil,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			file, err := os.Open(tt.filePath)
			assert.NoError(t, err)
			defer file.Close()

			csvIngest := &meteo.CSV{}
			inserted, rejected, err := csvIngest.Parse(file)

			if tt.expectError {
				assert.Error(t, err)
				assert.ErrorIs(t, err, meteo.ErrCannotParseFile)
				return
			}

			assert.NoError(t, err)

			if tt.validateInserted != nil {
				tt.validateInserted(t, inserted)
			}
			if tt.validateRejected != nil {
				tt.validateRejected(t, rejected)
			}
		})
	}
}