// Package task provides test task implementation for system verification
package task

import (
	"context"
	"fmt"
	"time"

	"modelRT/database"
	"modelRT/logger"
	"modelRT/orm"

	"github.com/gofrs/uuid"
	"gorm.io/gorm"
)

// TestTaskParams defines parameters for test task
type TestTaskParams struct {
	// SleepDuration specifies how long the task should sleep (in seconds)
	// Default is 60 seconds as per requirement
	SleepDuration int `json:"sleep_duration"`
	// Message is a custom message to include in the result
	Message string `json:"message,omitempty"`
}

// Validate checks if test task parameters are valid
func (p *TestTaskParams) Validate() error {
	// Default to 60 seconds if not specified
	if p.SleepDuration <= 0 {
		p.SleepDuration = 60
	}

	// Validate max duration (max 1 hour)
	if p.SleepDuration > 3600 {
		return fmt.Errorf("sleep duration cannot exceed 3600 seconds (1 hour)")
	}

	return nil
}

// GetType returns the task type
func (p *TestTaskParams) GetType() UnifiedTaskType {
	return TaskTypeTest
}

// ToMap converts parameters to map for database storage
func (p *TestTaskParams) ToMap() map[string]interface{} {
	return map[string]interface{}{
		"sleep_duration": p.SleepDuration,
		"message":        p.Message,
	}
}

// FromMap populates parameters from map (for database retrieval)
func (p *TestTaskParams) FromMap(params map[string]interface{}) error {
	if v, ok := params["sleep_duration"]; ok {
		if duration, isFloat := v.(float64); isFloat {
			p.SleepDuration = int(duration)
		} else if duration, isInt := v.(int); isInt {
			p.SleepDuration = duration
		}
	}

	if v, ok := params["message"]; ok {
		if msg, isString := v.(string); isString {
			p.Message = msg
		}
	}

	return nil
}

// TestTask implements a test task that sleeps for specified duration
// This task contains no I/O operations as per requirements
type TestTask struct {
	*BaseTask
}

// NewTestTask creates a new TestTask instance
func NewTestTask(params TestTaskParams) *TestTask {
	return &TestTask{
		BaseTask: NewBaseTask(TaskTypeTest, &params, "test_task"),
	}
}

// Execute performs the test task logic (sleep without I/O operations)
func (t *TestTask) Execute(ctx context.Context, taskID uuid.UUID, db *gorm.DB) error {
	params, ok := t.GetParams().(*TestTaskParams)
	if !ok {
		return fmt.Errorf("invalid parameter type for TestTask")
	}

	logger.Info(ctx, "Starting test task execution",
		"task_id", taskID,
		"sleep_duration_seconds", params.SleepDuration,
		"message", params.Message,
	)

	// Sleep for the specified duration without any I/O operations
	// This is pure CPU-time wait as per requirements
	sleepDuration := time.Duration(params.SleepDuration) * time.Second
	time.Sleep(sleepDuration)

	// Build result
	result := map[string]interface{}{
		"status":          "completed",
		"sleep_duration":   params.SleepDuration,
		"message":         params.Message,
		"executed_at":     time.Now().Unix(),
		"task_id":         taskID.String(),
	}

	// Save result to database
	if err := database.UpdateAsyncTaskResultWithSuccess(ctx, db, taskID, orm.JSONMap(result)); err != nil {
		logger.Error(ctx, "Failed to save test task result",
			"task_id", taskID,
			"error", err,
		)
		return fmt.Errorf("failed to save task result: %w", err)
	}

	logger.Info(ctx, "Test task completed successfully",
		"task_id", taskID,
		"sleep_duration_seconds", params.SleepDuration,
	)

	return nil
}

// TestTaskHandler handles test task execution
type TestTaskHandler struct {
	*BaseHandler
}

// NewTestTaskHandler creates a new TestTaskHandler
func NewTestTaskHandler() *TestTaskHandler {
	return &TestTaskHandler{
		BaseHandler: NewBaseHandler("test_task_handler"),
	}
}

// Execute processes a test task using the unified task interface
func (h *TestTaskHandler) Execute(ctx context.Context, taskID uuid.UUID, taskType TaskType, db *gorm.DB) error {
	logger.Info(ctx, "Executing test task",
		"task_id", taskID,
		"task_type", taskType,
	)

	// Fetch task parameters from database
	asyncTask, err := database.GetAsyncTaskByID(ctx, db, taskID)
	if err != nil {
		return fmt.Errorf("failed to fetch task: %w", err)
	}

	// Convert params map to TestTaskParams
	params := &TestTaskParams{}
	if err := params.FromMap(map[string]interface{}(asyncTask.Params)); err != nil {
		return fmt.Errorf("failed to parse task params: %w", err)
	}

	// Create and execute test task
	testTask := NewTestTask(*params)
	return testTask.Execute(ctx, taskID, db)
}

// CanHandle returns true for test tasks
func (h *TestTaskHandler) CanHandle(taskType TaskType) bool {
	return string(TaskTypeTest) == string(taskType)
}