package app

import (
    "fmt"
    "reflect"
    "strings"
    "github.com/seaweedfs/seaweedfs/weed/admin/maintenance"
    "github.com/seaweedfs/seaweedfs/weed/admin/config"
)

templ MaintenanceConfigSchema(data *maintenance.MaintenanceConfigData, schema *maintenance.MaintenanceConfigSchema) {
    <div class="container-fluid">
        <div class="row mb-4">
            <div class="col-12">
                <div class="d-flex justify-content-between align-items-center">
                    <h2 class="mb-0">
                        <i class="fas fa-cogs me-2"></i>
                        Maintenance Configuration
                    </h2>
                    <div class="btn-group">
                        <a href="/maintenance/tasks" class="btn btn-outline-primary">
                            <i class="fas fa-tasks me-1"></i>
                            View Tasks
                        </a>
                    </div>
                </div>
            </div>
        </div>

        <div class="row">
            <div class="col-12">
                <div class="card">
                    <div class="card-header">
                        <h5 class="mb-0">System Settings</h5>
                    </div>
                    <div class="card-body">
                        <form id="maintenanceConfigForm">
                            <!-- Dynamically render all schema fields in order -->
                            for _, field := range schema.Fields {
                                @ConfigField(field, getMaintenanceFieldValue(data.Config, field.JSONName))
                            }

                            <div class="d-flex gap-2">
                                <button type="button" class="btn btn-primary" onclick="saveConfiguration()">
                                    <i class="fas fa-save me-1"></i>
                                    Save Configuration
                                </button>
                                <button type="button" class="btn btn-secondary" onclick="resetToDefaults()">
                                    <i class="fas fa-undo me-1"></i>
                                    Reset to Defaults
                                </button>
                            </div>
                        </form>
                    </div>
                </div>
            </div>
        </div>

        <!-- Task Configuration Cards -->
        <div class="row mt-4">
            <div class="col-md-4">
                <div class="card">
                    <div class="card-header">
                        <h5 class="mb-0">
                            <i class="fas fa-broom me-2"></i>
                            Volume Vacuum
                        </h5>
                    </div>
                    <div class="card-body">
                        <p class="card-text">Reclaims disk space by removing deleted files from volumes.</p>
                        <a href="/maintenance/config/vacuum" class="btn btn-primary">Configure</a>
                    </div>
                </div>
            </div>
            <div class="col-md-4">
                <div class="card">
                    <div class="card-header">
                        <h5 class="mb-0">
                            <i class="fas fa-balance-scale me-2"></i>
                            Volume Balance
                        </h5>
                    </div>
                    <div class="card-body">
                        <p class="card-text">Redistributes volumes across servers to optimize storage utilization.</p>
                        <a href="/maintenance/config/balance" class="btn btn-primary">Configure</a>
                    </div>
                </div>
            </div>
            <div class="col-md-4">
                <div class="card">
                    <div class="card-header">
                        <h5 class="mb-0">
                            <i class="fas fa-shield-alt me-2"></i>
                            Erasure Coding
                        </h5>
                    </div>
                    <div class="card-body">
                        <p class="card-text">Converts volumes to erasure coded format for improved durability.</p>
                        <a href="/maintenance/config/erasure_coding" class="btn btn-primary">Configure</a>
                    </div>
                </div>
            </div>
        </div>
    </div>

    <script>
        function saveConfiguration() {
            const form = document.getElementById('maintenanceConfigForm');
            const formData = new FormData(form);
            
            // Convert form data to JSON, handling interval fields specially
            const config = {};
            
            for (let [key, value] of formData.entries()) {
                if (key.endsWith('_value')) {
                    // This is an interval value part
                    const baseKey = key.replace('_value', '');
                    const unitKey = baseKey + '_unit';
                    const unitValue = formData.get(unitKey);
                    
                    if (unitValue) {
                        // Convert to seconds based on unit
                        const numValue = parseInt(value) || 0;
                        let seconds = numValue;
                        switch(unitValue) {
                            case 'minutes':
                                seconds = numValue * 60;
                                break;
                            case 'hours':
                                seconds = numValue * 3600;
                                break;
                            case 'days':
                                seconds = numValue * 24 * 3600;
                                break;
                        }
                        config[baseKey] = seconds;
                    }
                } else if (key.endsWith('_unit')) {
                    // Skip unit keys - they're handled with their corresponding value
                    continue;
                } else {
                    // Regular field
                    if (form.querySelector(`[name="${key}"]`).type === 'checkbox') {
                        config[key] = form.querySelector(`[name="${key}"]`).checked;
                    } else {
                        const numValue = parseFloat(value);
                        config[key] = isNaN(numValue) ? value : numValue;
                    }
                }
            }

            fetch('/maintenance/config', {
                method: 'POST',
                headers: {
                    'Content-Type': 'application/json',
                },
                body: JSON.stringify(config)
            })
            .then(response => response.json())
            .then(data => {
                if (data.success) {
                    alert('Configuration saved successfully!');
                    location.reload();
                } else {
                    alert('Error saving configuration: ' + (data.error || 'Unknown error'));
                }
            })
            .catch(error => {
                console.error('Error:', error);
                alert('Error saving configuration: ' + error.message);
            });
        }

        function resetToDefaults() {
            if (confirm('Are you sure you want to reset to default configuration? This will overwrite your current settings.')) {
                fetch('/maintenance/config/defaults', {
                    method: 'POST',
                    headers: {
                        'Content-Type': 'application/json',
                    }
                })
                .then(response => response.json())
                .then(data => {
                    if (data.success) {
                        alert('Configuration reset to defaults!');
                        location.reload();
                    } else {
                        alert('Error resetting configuration: ' + (data.error || 'Unknown error'));
                    }
                })
                .catch(error => {
                    console.error('Error:', error);
                    alert('Error resetting configuration: ' + error.message);
                });
            }
        }
    </script>
}

// ConfigField renders a single configuration field based on schema
templ ConfigField(field *config.Field, value interface{}) {
    if field.InputType == "interval" {
        <!-- Interval field with number input + unit dropdown -->
        <div class="mb-3">
            <label for={ field.JSONName } class="form-label">
                { field.DisplayName }
                if field.Required {
                    <span class="text-danger">*</span>
                }
            </label>
            <div class="input-group">
                <input 
                    type="number" 
                    class="form-control" 
                    id={ field.JSONName + "_value" } 
                    name={ field.JSONName + "_value" } 
                    value={ fmt.Sprintf("%.0f", convertSecondsToDisplayValue(value, field)) }
                    step="1"
                    min="1"
                    if field.Required {
                        required
                    }
                />
                <select 
                    class="form-select" 
                    id={ field.JSONName + "_unit" } 
                    name={ field.JSONName + "_unit" }
                    style="max-width: 120px;"
                    if field.Required {
                        required
                    }
                >
                    <option 
                        value="minutes"
                        if getDisplayUnit(value, field) == "minutes" {
                            selected
                        }
                    >
                        Minutes
                    </option>
                    <option 
                        value="hours"
                        if getDisplayUnit(value, field) == "hours" {
                            selected
                        }
                    >
                        Hours
                    </option>
                    <option 
                        value="days"
                        if getDisplayUnit(value, field) == "days" {
                            selected
                        }
                    >
                        Days
                    </option>
                </select>
            </div>
            if field.Description != "" {
                <div class="form-text text-muted">{ field.Description }</div>
            }
        </div>
    } else if field.InputType == "checkbox" {
        <!-- Checkbox field -->
        <div class="mb-3">
            <div class="form-check form-switch">
                <input 
                    class="form-check-input"
                    type="checkbox" 
                    id={ field.JSONName }
                    name={ field.JSONName }
                    if getBoolValue(value) {
                        checked
                    }
                />
                <label class="form-check-label" for={ field.JSONName }>
                    <strong>{ field.DisplayName }</strong>
                </label>
            </div>
            if field.Description != "" {
                <div class="form-text text-muted">{ field.Description }</div>
            }
        </div>
    } else {
        <!-- Number field -->
        <div class="mb-3">
            <label for={ field.JSONName } class="form-label">
                { field.DisplayName }
                if field.Required {
                    <span class="text-danger">*</span>
                }
            </label>
            <input 
                type="number" 
                class="form-control" 
                id={ field.JSONName }
                name={ field.JSONName }
                value={ fmt.Sprintf("%v", value) }
                placeholder={ field.Placeholder }
                if field.MinValue != nil {
                    min={ fmt.Sprintf("%v", field.MinValue) }
                }
                if field.MaxValue != nil {
                    max={ fmt.Sprintf("%v", field.MaxValue) }
                }
                step={ getNumberStep(field) }
                if field.Required {
                    required
                }
            />
            if field.Description != "" {
                <div class="form-text text-muted">{ field.Description }</div>
            }
        </div>
    }
}

// Helper functions for the template
func getBoolValue(value interface{}) bool {
    if boolVal, ok := value.(bool); ok {
        return boolVal
    }
    return false
}

func convertSecondsToDisplayValue(value interface{}, field *config.Field) float64 {
    if intVal, ok := value.(int); ok {
        if intVal == 0 {
            return 0
        }
        
        // Check if it's evenly divisible by days
        if intVal%(24*3600) == 0 {
            return float64(intVal / (24 * 3600))
        }
        
        // Check if it's evenly divisible by hours
        if intVal%3600 == 0 {
            return float64(intVal / 3600)
        }
        
        // Default to minutes
        return float64(intVal / 60)
    }
    return 0
}

func getDisplayUnit(value interface{}, field *config.Field) string {
    if intVal, ok := value.(int); ok {
        if intVal == 0 {
            return "minutes"
        }
        
        // Check if it's evenly divisible by days
        if intVal%(24*3600) == 0 {
            return "days"
        }
        
        // Check if it's evenly divisible by hours
        if intVal%3600 == 0 {
            return "hours"
        }
        
        // Default to minutes
        return "minutes"
    }
    return "minutes"
}

func getNumberStep(field *config.Field) string {
    if field.Type == config.FieldTypeFloat {
        return "0.01"
    }
    return "1"
}

func getMaintenanceFieldValue(config *maintenance.MaintenanceConfig, fieldName string) interface{} {
    if config == nil {
        return nil
    }
    
    // Use reflection to get the field value from the config struct
    configValue := reflect.ValueOf(config)
    if configValue.Kind() == reflect.Ptr {
        configValue = configValue.Elem()
    }
    
    if configValue.Kind() != reflect.Struct {
        return nil
    }
    
    configType := configValue.Type()
    
    for i := 0; i < configValue.NumField(); i++ {
        field := configValue.Field(i)
        fieldType := configType.Field(i)
        
        // Get JSON tag name
        jsonTag := fieldType.Tag.Get("json")
        if jsonTag == "" {
            continue
        }
        
        // Remove options like ",omitempty"
        if commaIdx := strings.Index(jsonTag, ","); commaIdx > 0 {
            jsonTag = jsonTag[:commaIdx]
        }
        
        if jsonTag == fieldName {
            return field.Interface()
        }
    }
    
    // Handle nested Policy fields
    if config.Policy != nil && fieldName == "global_max_concurrent" {
        return config.Policy.GlobalMaxConcurrent
    }
    
    return nil
}

// Helper function to convert schema to JSON for JavaScript
templ schemaToJSON(schema *maintenance.MaintenanceConfigSchema) {
    {`{}`}
}