package ckprompt

import (
	"errors"
	"fmt"

	commandkit "go.maximumdirect.net/commandkit"
)

type validationCommandInput[I any] struct {
	promptID  string
	request   ValidationRequest
	execution ExecutionInput
	resources ResourceInput
	inputs    PromptInputs
	captured  commandkit.FlagValues[I]
	selected  I
}

type requestValidationReport struct {
	PromptID string `json:"prompt_id"`
	Valid    bool   `json:"valid"`
}

func newValidationCommand[I, S any](suite Suite[I, S]) commandkit.Command {
	flags := commandkit.CaptureFlags(suite.Selectors, func(input **validationCommandInput[I]) *commandkit.FlagValues[I] {
		if input == nil || *input == nil {
			return nil
		}
		return &(*input).captured
	})
	flags = append(flags,
		commandkit.ValueFlag(commandkit.FlagMeta{Name: "config", Usage: "Configuration input path.", Completion: commandkit.CompleteFiles()}, (*string)(nil), parseDefinitionString,
			func(input **validationCommandInput[I], value commandkit.Supplied[string]) {
				(*input).request.Selection.Config = value
			}),
		commandkit.ValueFlag(commandkit.FlagMeta{Name: "overlay", Usage: "Configuration overlay path.", Completion: commandkit.CompleteFiles()}, (*string)(nil), parseDefinitionString,
			func(input **validationCommandInput[I], value commandkit.Supplied[string]) {
				(*input).request.Selection.Overlay = value
			}),
	)

	resources := NewResourceFlags(func(input **validationCommandInput[I]) *ResourceInput { return &(*input).resources })
	execution := NewExecutionFlags(func(input **validationCommandInput[I]) *ExecutionInput { return &(*input).execution })
	inputs := NewPromptInputFlags(func(input **validationCommandInput[I]) *PromptInputs { return &(*input).inputs })
	flags = append(flags, resources.Profile, resources.SessionID, inputs.Variable, inputs.Text, inputs.File)
	flags = append(flags, execution.All()...)

	return commandkit.NewCommand(commandkit.CommandSpec[*validationCommandInput[I]]{
		Name:    "validate",
		Summary: "Validate a concrete PromptKit request without executing it.",
		NewInput: func() *validationCommandInput[I] {
			return &validationCommandInput[I]{}
		},
		Flags: flags,
		Arguments: []commandkit.Argument[*validationCommandInput[I]]{
			commandkit.ValueArgument(commandkit.ArgumentMeta{Name: "id", Usage: "Prompt ID."}, true, parseDefinitionString,
				func(input **validationCommandInput[I], value commandkit.Supplied[string]) {
					(*input).promptID = value.Value
					(*input).request.Request.PromptID = value.Value
				}),
		},
		CheckInput: func(input *validationCommandInput[I]) error {
			if input == nil {
				return errors.New("PromptKit validation input must not be nil")
			}
			input.request.Request.ProfileID = input.resources.Profile.Value
			input.request.Request.SessionID = input.resources.SessionID.Value
			input.request.Request.Vars = input.inputs.Vars
			input.request.Request.Inputs = input.inputs.Inputs
			input.request.Request.Execution = input.execution.Execution
			input.request.Request.TransientRetries = input.execution.TransientRetries
			selected, err := prepareSuiteInput(suite, input.request.Selection, input.captured)
			if err != nil {
				return err
			}
			input.selected = selected
			return nil
		},
		Run: func(invocation commandkit.Invocation, input *validationCommandInput[I]) commandkit.Outcome {
			return runRequestValidation(invocation, suite, input)
		},
	})
}

func runRequestValidation[I, S any](invocation commandkit.Invocation, suite Suite[I, S], input *validationCommandInput[I]) commandkit.Outcome {
	if err := promptKitContextError(invocation.Context); err != nil {
		return definitionFailure("PromptKit request validation was canceled.", commandkit.Explanation{}, err)
	}
	var state S
	if suite.NewState != nil {
		state = suite.NewState()
	}
	if err := promptKitContextError(invocation.Context); err != nil {
		return definitionFailure("PromptKit request validation was canceled.", commandkit.Explanation{}, err)
	}

	acquired, err := suite.ValidateRequest(invocation.Context, input.request, input.selected, state)
	queuePromptDiagnostics(invocation.Reporter(), acquired.Diagnostics)
	if err != nil {
		return definitionFailure(fmt.Sprintf("Unable to validate the PromptKit request for prompt %q.", input.promptID), acquired.Explanation, err)
	}
	if err := promptKitContextError(invocation.Context); err != nil {
		return definitionFailure(fmt.Sprintf("Validation of the PromptKit request for prompt %q was canceled.", input.promptID), acquired.Explanation, err)
	}
	_ = invocation.Reporter().Report(commandkit.Report{Value: requestValidationReport{PromptID: input.promptID, Valid: true}})
	return commandkit.Success()
}