package ckconfig

import (
	"fmt"
	"text/template"

	commandkit "go.maximumdirect.net/commandkit"
)

type validationReport struct {
	Scopes []validationScope `json:"scopes"`
}

type validationScope struct {
	Scope   string `json:"scope"`
	Outcome string `json:"outcome"`
}

var validationTextTemplate = template.Must(commandkit.ParseTextTemplate("validation", "{{range .Scopes}}{{.Scope}}: {{.Outcome}}\n{{end}}", nil))

func runConfigValidation[I, S any](invocation commandkit.Invocation, plan *configOperationPlan[I, S], state S) commandkit.Outcome {
	reporter := invocation.Reporter()
	report := validationReport{Scopes: make([]validationScope, 0, len(plan.scopes))}
	outcome := commandkit.Success()
	for _, selected := range plan.scopes {
		if err := invocation.Context.Err(); err != nil {
			outcome = configFailure("Configuration validation was canceled.", commandkit.Explanation{}, err)
			break
		}
		name := selected.scope.scope.Name
		if selected.scope.scope.Acquire == nil {
			report.Scopes = append(report.Scopes, validationScope{Scope: name, Outcome: "failed"})
			outcome = commandkit.Failure(fmt.Sprintf("Configuration scope %q has no acquisition callback.", name))
			break
		}
		acquired, err := selected.scope.scope.Acquire(invocation.Context, Request{Operation: Validate, Selection: plan.selection}, selected.input, state)
		if err != nil {
			status := "failed"
			if invocation.Context.Err() != nil {
				status = "canceled"
			}
			report.Scopes = append(report.Scopes, validationScope{Scope: name, Outcome: status})
			outcome = configAcquisitionFailure(reporter, "validate", name, acquired, err)
			break
		}
		queueConfigDiagnostics(reporter, acquired.Diagnostics)
		if err := invocation.Context.Err(); err != nil {
			report.Scopes = append(report.Scopes, validationScope{Scope: name, Outcome: "canceled"})
			outcome = configFailure("Configuration validation was canceled.", acquired.Explanation, err)
			break
		}
		report.Scopes = append(report.Scopes, validationScope{Scope: name, Outcome: "valid"})
	}
	if len(report.Scopes) > 0 {
		_ = reporter.Report(commandkit.Report{Value: report, TextTemplate: validationTextTemplate})
	}
	return outcome
}