// Copyright IBM Corp. 2014, 2026
// SPDX-License-Identifier: BUSL-1.1

package command

import (
	"context"
	"fmt"

	"github.com/hashicorp/terraform/internal/backend/backendrun"
	"github.com/hashicorp/terraform/internal/command/arguments"
	"github.com/hashicorp/terraform/internal/command/jsonprovider"
	"github.com/hashicorp/terraform/internal/tfdiags"
)

// ProvidersCommand is a Command implementation that prints out information
// about the providers used in the current configuration/state.
type ProvidersSchemaCommand struct {
	Meta
}

func (c *ProvidersSchemaCommand) Help() string {
	return providersSchemaCommandHelp
}

func (c *ProvidersSchemaCommand) Synopsis() string {
	return "Show schemas for the providers used in the configuration"
}

func (c *ProvidersSchemaCommand) Run(args []string) int {
	parsedArgs, diags := arguments.ParseProvidersSchema(c.Meta.process(args))
	if diags.HasErrors() {
		c.showDiagnostics(diags)
		return 1
	}

	viewType := arguments.ViewJSON // See above; enforced use of JSON output

	// Check for user-supplied plugin path
	var err error
	if c.pluginPath, err = c.loadPluginPath(); err != nil {
		c.Ui.Error(fmt.Sprintf("Error loading plugin path: %s", err))
		return 1
	}
	// Load the backend
	b, backendDiags := c.backend(".", viewType)
	diags = diags.Append(backendDiags)
	if backendDiags.HasErrors() {
		c.showDiagnostics(diags)
		return 1
	}

	// We require a local backend
	local, ok := b.(backendrun.Local)
	if !ok {
		c.showDiagnostics(diags) // in case of any warnings in here
		c.Ui.Error(ErrUnsupportedLocalOp)
		return 1
	}

	// This is a read-only command
	c.ignoreRemoteVersionConflict(b)

	// Get the config directory
	cwd := c.WorkingDir.RootModuleDir()

	// Build the operation
	opReq := c.Operation(b, arguments.ViewJSON)
	opReq.ConfigDir = cwd
	opReq.ConfigLoader, err = c.initConfigLoader()
	opReq.AllowUnsetVariables = true
	if err != nil {
		diags = diags.Append(err)
		c.showDiagnostics(diags)
		return 1
	}

	var varDiags tfdiags.Diagnostics
	opReq.Variables, varDiags = parsedArgs.Vars.CollectValues(func(filename string, src []byte) {
		opReq.ConfigLoader.Parser().ForceFileSource(filename, src)
	})
	diags = diags.Append(varDiags)
	if diags.HasErrors() {
		c.showDiagnostics(diags)
		return 1
	}

	// Get the context
	lr, _, ctxDiags := local.LocalRun(context.Background(), opReq)

	diags = diags.Append(ctxDiags)
	if ctxDiags.HasErrors() {
		c.showDiagnostics(diags)
		return 1
	}

	schemas, moreDiags := lr.Core.Schemas(lr.Config, lr.InputState)
	diags = diags.Append(moreDiags)
	if moreDiags.HasErrors() {
		c.showDiagnostics(diags)
		return 1
	}

	jsonSchemas, err := jsonprovider.Marshal(schemas)
	if err != nil {
		c.Ui.Error(fmt.Sprintf("Failed to marshal provider schemas to json: %s", err))
		return 1
	}
	c.Ui.Output(string(jsonSchemas))

	return 0
}

const providersSchemaCommandHelp = `
Usage: terraform [global options] providers schema -json

  Prints out a json representation of the schemas for all providers used
  in the current configuration.

Options:

  -var 'foo=bar'      Set a value for one of the input variables in the root
                      module of the configuration. Use this option more than
                      once to set more than one variable.

  -var-file=filename  Load variable values from the given file, in addition
                      to the default files terraform.tfvars and *.auto.tfvars.
                      Use this option more than once to include more than one
                      variables file.
`
