package app

import (
	"database/sql"
	"encoding/json"
	"fmt"
	"log"
	"log/slog"
	"os"
	"time"

	"headshed/infctl-cli/config"
	"headshed/infctl-cli/database"
)

type AppState struct {
	Config   config.BaseConfig
	Customer config.CustomerConfig
	DB       *sql.DB
}

type PipelineStep struct {
	Name        string
	Function    string   // Name of the function to call
	Params      []string // Parameters for the function
	RetryCount  int
	ShouldAbort bool
}

var functionMap = map[string]func([]string) error{
	"k8sNamespaceExists": func(params []string) error {
		if len(params) != 1 {
			return fmt.Errorf("invalid parameters for k8sNamespaceExists")
		}
		return k8sNamespaceExists(params[0])
	},
	"RunCommand": func(params []string) error {
		if len(params) != 1 {
			return fmt.Errorf("invalid parameters for RunCommand")
		}
		return RunCommand(params[0])
	},
	// Add more functions as needed
}

func parseStepsFromJSON(filePath string) ([]PipelineStep, error) {
	data, err := os.ReadFile(filePath)
	if err != nil {
		return nil, fmt.Errorf("failed to read JSON file: %w", err)
	}

	var steps []PipelineStep
	if err := json.Unmarshal(data, &steps); err != nil {
		return nil, fmt.Errorf("failed to unmarshal JSON: %w", err)
	}

	return steps, nil
}

func (app *AppState) ToDoDeployment() []PipelineStep {
	slog.Info("ToDo deployment is not implemented yet")
	return []PipelineStep{}
}

func (app *AppState) RunJsonDeployment() []PipelineStep {

	jsonFile := app.Config.DeploymentFile
	if jsonFile == "" {
		log.Fatal("no config specified with --deployment-file=<path_to_config_file>")
	}

	file, err := os.Open(jsonFile)
	if err != nil {
		slog.Error(fmt.Sprintf("Failed to open JSON file: %s", err))
	}

	defer file.Close()

	steps, err := parseStepsFromJSON(jsonFile)
	if err != nil {
		slog.Error(fmt.Sprintf("Failed to parse JSON file: %s", err))
	}

	for _, step := range steps {
		slog.Info(fmt.Sprintf("🔄 Running step: %s", step.Name))
		function, exists := functionMap[step.Function]
		if !exists {
			slog.Error(fmt.Sprintf("Unknown function: %s", step.Function))
			continue
		}

		err := function(step.Params)
		if err != nil {
			slog.Error(fmt.Sprintf("❌ Step failed: %s, error: %v", step.Name, err))
			if step.ShouldAbort {
				log.Fatalf("🚨Critical failure at step: %s", step.Name)
			}
		} else {
			slog.Info(fmt.Sprintf("✅ Step completed: %s", step.Name))
		}
	}
	return steps
}

func (app *AppState) getPipeline() []PipelineStep {

	switch app.Config.DeploymentType {

	case "api":
		return app.ToDoDeployment()

	case "json":
		return app.RunJsonDeployment()

	default:
		return app.RunJsonDeployment()
	}
}

func NewAppState(cust config.CustomerConfig, config config.BaseConfig, dbPath string) (*AppState, error) {
	db, err := database.NewDatabase(dbPath)
	if err != nil {
		return nil, err
	}

	return &AppState{
		Config:   config,
		Customer: cust,
		DB:       db,
	}, nil
}

func (app *AppState) runPipeline(steps []PipelineStep) error {
	for _, step := range steps {
		slog.Info(fmt.Sprintf("🔄 Running step: %s\n", step.Name))

		// Look up the function in the functionMap
		function, exists := functionMap[step.Function]
		if !exists {
			slog.Error(fmt.Sprintf("❌ Unknown function: %s", step.Function))
			if step.ShouldAbort {
				return fmt.Errorf("🚨critical failure: unknown function %s", step.Function)
			}
			continue
		}

		// Execute the function with the provided parameters
		err := function(step.Params)
		if err != nil {
			slog.Error(fmt.Sprintf("❌ Step failed: %s, error: %v", step.Name, err))

			// Retry logic
			if step.RetryCount > 0 {
				for i := 0; i < step.RetryCount; i++ {
					slog.Info("Waiting for 20 seconds before retrying...")
					time.Sleep(20 * time.Second)
					if innerErr := function(step.Params); innerErr == nil {
						slog.Info(fmt.Sprintf("✅ Step completed: %s\n", step.Name))
						err = nil
						break
					} else {
						err = innerErr
					}
				}
			}

			// Handle failure after retries
			if err != nil {
				if step.ShouldAbort {
					return fmt.Errorf("🚨critical failure at step: %s", step.Name)
				}
				continue
			}
		}

		slog.Info(fmt.Sprintf("✅ Step completed: %s\n", step.Name))
	}
	return nil
}

func (app *AppState) SetUpNewCustomer() error {

	/*
	 | --------------------------
	 | main pipeline
	 | --------------------------
	*/

	steps := app.getPipeline()
	app.runPipeline(steps)
	slog.Info(fmt.Sprintln("🎉 Pipeline setup complete!"))

	return nil
}

func (app *AppState) CreatePipeline() error {
	isNew, err := database.CheckProjectName(app.DB, app.Customer.Project)
	if err != nil {
		return fmt.Errorf("failed to check project name: %w", err)
	}

	if isNew {

		port, err := database.GetNextPortNumber(app.DB)
		if err != nil {
			return fmt.Errorf("failed to get next port number: %w", err)
		}
		err = database.AddProjectName(app.DB, app.Customer.Project, port)
		if err != nil {
			return fmt.Errorf("failed to add project name: %w", err)
		}
		slog.Info(fmt.Sprintln("Project name added:", app.Customer.Project))
		fmt.Printf("Port number assigned: %d\n", port)
		app.Config.Port = port
	} else {
		slog.Info(fmt.Sprintln("Project name already exists:", app.Customer.Project))
	}

	err = app.SetUpNewCustomer()
	if err != nil {
		return fmt.Errorf("failed to set up new customer: %w", err)
	}

	return nil
}