package core

import (
	"forge.tedomum.net/kludge/leviathan/libs"
	"forge.tedomum.net/kludge/leviathan/utils"
	"github.com/panjf2000/ants"
	"gopkg.in/yaml.v3"
	"os"
	"path"
	"sync"
)

type Runner struct {
	Target    string
	Workspace string
	Workflow  libs.Workflow
	Options   *libs.Options
	Reports   []string
	DSL       map[string]interface{}

	Params map[string]string
}

func InitRunner(target string, options *libs.Options) (*Runner, error) {
	var runner Runner
	runner.Target = target
	runner.Options = options

	// Create workspace if it does not exists
	runner.Workspace = path.Join(options.Environment.Workspaces, utils.CleanPath(target))
	if _, err := os.Stat(runner.Workspace); os.IsNotExist(err) {
		utils.Logger.Debug().Str("workspace", runner.Workspace).Msg("Create workspace folder")
		if err = os.MkdirAll(runner.Workspace, 0700); err != nil {
			return &runner, err
		}
	}

	// Init DSL with variables
	runner.initDSL()
	runner.initParams()

	// Try to import workflow
	if !runner.importWorkflow() {
		utils.Logger.Error().Str("workflow", runner.Options.Scan.Flow).Msg("Unable to import workflow")
		return &runner, nil
	}

	// Check modules
	for _, routine := range runner.Workflow.Routines {
		for _, module := range routine.Modules {
			if !utils.IsYamlValid(module, runner.Options.Environment.Modules) {
				utils.Logger.Fatal().Str("module", module).Msg("Module invalid")
				return &runner, nil
			}
		}
	}

	return &runner, nil
}

func (r *Runner) Start() {
	utils.Logger.Info().
		Str("runner", r.Target).
		Str("workflow", r.Workflow.Name).
		Msg("Start runner")

	for _, routine := range r.Workflow.Routines {
		// Check for params in module
		for _, param := range routine.Params {
			for k, v := range param {
				// Routine params do not override workflow and user params
				if r.Params[k] == "" {
					r.setParam(k, v)
				}
			}
		}

		// Start each modules
		var wg sync.WaitGroup
		p, _ := ants.NewPoolWithFunc(r.Options.Scan.Threads*10, func(m interface{}) {
			module := m.(string)
			r.startModule(module)
			wg.Done()
		}, ants.WithPreAlloc(true))
		defer p.Release()

		for _, module := range routine.Modules {
			p.Invoke(module)
			wg.Add(1)
		}

		wg.Wait()
	}

	if !r.Options.Scan.NoClean {
		utils.Logger.Info().Str("workspace", r.Workspace).Msg("Clean workspace")
		CleanWorkspace(r.Workspace, r.Reports)
	}
}

func (r *Runner) importWorkflow() bool {
	fullPath := utils.CheckExistence(r.Options.Scan.Flow, r.Options.Environment.Workflows)
	content, err := r.ParseTemplate(fullPath)
	if err != nil {
		utils.Logger.Error().Msg(err.Error())
		return false
	}

	if err = yaml.Unmarshal(content, &r.Workflow); err != nil {
		utils.Logger.Error().Msg(err.Error())
		return false
	}

	// re-init params to handle Workflow params
	r.initParams()
	return true
}

func (r *Runner) startModule(moduleName string) {
	utils.Logger.Info().Str("module", moduleName).Msg("Run module")

	// Import module before executing it
	m := libs.Module{}
	fullPath := utils.CheckExistence(moduleName, r.Options.Environment.Modules)
	content, _ := os.ReadFile(fullPath)
	if err := yaml.Unmarshal(content, &m); err != nil {
		utils.Logger.Error().Msg(err.Error())
		return
	}

	// Check for params in module
	for _, param := range m.Params {
		for k, v := range param {
			// Module params do not override workflow, routine and user params
			if r.Params[k] == "" {
				r.setParam(k, v)
			}
		}
	}

	// Save the reports generated by the module
	for _, report := range m.Reports {
		reportPath := r.ParseString(report)
		utils.Logger.Debug().Str("module", m.Name).Str("report", reportPath).Msg("Add report to the list")
		r.Reports = append(r.Reports, utils.NormalizePath(reportPath))
	}

	// Check if module has to be skipped
	if r.Options.Scan.Resume && len(m.Reports) != 0 {
		skipModule := true
		for _, report := range m.Reports {
			if !utils.FileExists(r.ParseString(report)) {
				skipModule = false
			}
		}
		if skipModule {
			utils.Logger.Info().Str("module", m.Name).Msg("skip module (--resume flag used)")
			return
		}
	}

	// Execute pre_run scripts
	if m.PreRun != nil {
		utils.Logger.Debug().Str("module", m.Name).Msg("Execute Pre_run scripts")
		r.runScripts(m.PreRun)
	}

	utils.Logger.Debug().Str("module", m.Name).Msg("Execute step")
	for _, step := range m.Steps {
		r.RunStep(&step)
	}

	if m.PostRun != nil {
		utils.Logger.Debug().Str("module", m.Name).Msg("Execute post_run scripts")
		r.runScripts(m.PostRun)
	}

}