package repository

import (
	"fmt"
	"log/slog"
	"sort"

	"github.com/rogeecn/database_render/internal/config"
	"github.com/rogeecn/database_render/internal/database"
	"github.com/rogeecn/database_render/internal/model"
)

// DataRepository handles data access operations
type DataRepository struct {
	db     *database.ConnectionManager
	config *config.Config
	logger *slog.Logger
}

// NewDataRepository creates a new data repository
func NewDataRepository(db *database.ConnectionManager, cfg *config.Config) *DataRepository {
	return &DataRepository{
		db:     db,
		config: cfg,
		logger: slog.With("component", "repository"),
	}
}

// GetTables returns all configured tables
func (r *DataRepository) GetTables() ([]model.TableInfo, error) {
	var tables []model.TableInfo

	for name, tableConfig := range r.config.Tables {
		// Get row count for each table
		rowCount, err := r.db.GetTableRowCount(name)
		if err != nil {
			r.logger.Error("failed to get row count for table", "table", name, "error", err)
			rowCount = 0
		}

		// Use table alias as description if not provided
		description := tableConfig.Alias
		if desc, ok := tableConfig.Options["description"]; ok {
			if descStr, ok := desc.(string); ok {
				description = descStr
			}
		}

		tables = append(tables, model.TableInfo{
			Name:        name,
			Alias:       tableConfig.Alias,
			Description: description,
			RowCount:    rowCount,
		})
	}

	// Sort tables by name to ensure consistent ordering
	sort.Slice(tables, func(i, j int) bool {
		return tables[i].Name < tables[j].Name
	})

	return tables, nil
}

// GetTableConfig returns the configuration for a specific table
func (r *DataRepository) GetTableConfig(tableName string) (*model.TableConfig, error) {
	tableConfig, exists := r.config.Tables[tableName]
	if !exists {
		return nil, fmt.Errorf("table %s not found in configuration", tableName)
	}

	// Convert internal config to model config
	config := &model.TableConfig{
		Name:     tableName,
		Alias:    tableConfig.Alias,
		PageSize: tableConfig.PageSize,
		Columns:  []model.ColumnConfig{},
		Filters:  []model.FilterConfig{},
		Options:  tableConfig.Options,
	}

	// Convert field configurations
	for fieldName, fieldConfig := range tableConfig.Fields {
		column := model.ColumnConfig{
			Name:             fieldName,
			Alias:            fieldName,
			RenderType:       fieldConfig.Type,
			Sortable:         true, // Default to true
			Searchable:       fieldConfig.Searchable,
			ShowInList:       !fieldConfig.Hidden,
			IsPrimaryContent: fieldConfig.Markdown,
			MaxLength:        fieldConfig.MaxLength,
			Width:            fieldConfig.Size,
			Format:           fieldConfig.Format,
			Values:           make(map[string]model.TagValue),
			Options:          fieldConfig.Options,
		}

		// Handle tag values if colors are provided
		if len(fieldConfig.Colors) > 0 {
			for key, color := range fieldConfig.Colors {
				label := key
				column.Values[key] = model.TagValue{
					Label: label,
					Color: color,
				}
			}
		}

		config.Columns = append(config.Columns, column)
	}

	return config, nil
}

// GetTableData retrieves paginated data from a table
func (r *DataRepository) GetTableData(tableName string, page, pageSize int, search string, sortField string, sortOrder string) ([]map[string]interface{}, int64, error) {
	// Validate table exists in config
	_, exists := r.config.Tables[tableName]
	if !exists {
		return nil, 0, fmt.Errorf("table %s not found in configuration", tableName)
	}

	// Get data from database
	data, total, err := r.db.GetTableData(tableName, page, pageSize, search, sortField, sortOrder)
	if err != nil {
		r.logger.Error("failed to get table data",
			"table", tableName,
			"page", page,
			"error", err)
		return nil, 0, fmt.Errorf("failed to get table data: %w", err)
	}

	r.logger.Debug("retrieved table data",
		"table", tableName,
		"page", page,
		"pageSize", pageSize,
		"total", total,
		"records", len(data))

	return data, total, nil
}

// GetTableDataByID retrieves a single record by ID
func (r *DataRepository) GetTableDataByID(tableName string, id interface{}) (map[string]interface{}, error) {
	// Validate table exists in config
	_, exists := r.config.Tables[tableName]
	if !exists {
		return nil, fmt.Errorf("table %s not found in configuration", tableName)
	}

	// Get data from database
	data, err := r.db.GetTableDataByID(tableName, id)
	if err != nil {
		r.logger.Error("failed to get table data by ID",
			"table", tableName,
			"id", id,
			"error", err)
		return nil, fmt.Errorf("failed to get table data by ID: %w", err)
	}

	r.logger.Debug("retrieved single record",
		"table", tableName,
		"id", id)

	return data, nil
}

// GetTableColumns returns column information for a table
func (r *DataRepository) GetTableColumns(tableName string) ([]database.ColumnInfo, error) {
	// Validate table exists in config
	_, exists := r.config.Tables[tableName]
	if !exists {
		return nil, fmt.Errorf("table %s not found in configuration", tableName)
	}

	// Get column information from database
	columns, err := r.db.GetTableColumns(tableName)
	if err != nil {
		r.logger.Error("failed to get table columns",
			"table", tableName,
			"error", err)
		return nil, fmt.Errorf("failed to get table columns: %w", err)
	}

	return columns, nil
}

// ValidateTableConfig validates if the configured tables exist in the database
func (r *DataRepository) ValidateTableConfig() error {
	// Get all table names from database
	dbTables, err := r.db.GetTableNames()
	if err != nil {
		return fmt.Errorf("failed to get table names from database: %w", err)
	}

	// Create a map for quick lookup
	dbTableMap := make(map[string]bool)
	for _, table := range dbTables {
		dbTableMap[table] = true
	}

	// Check if all configured tables exist
	for tableName := range r.config.Tables {
		if !dbTableMap[tableName] {
			return fmt.Errorf("table %s not found in database", tableName)
		}
	}

	r.logger.Info("table configuration validation completed",
		"configured_tables", len(r.config.Tables),
		"database_tables", len(dbTables))

	return nil
}