package main

import (
	"context"
	"errors"

	"git.golem15.com/golem15/summercms/internal/docsite"
	"git.golem15.com/golem15/summercms/modules/bonfire"
)

func docsBuildCommand() bonfire.Command {
	return bonfire.Command{
		Name:        "docs:build",
		Description: "Build the documentation site",
		Flags: []bonfire.Flag{
			{Name: "root", Description: "Repository root; src= paths and modules/ resolve against it", Default: "."},
			{Name: "src", Description: "Docs source directory (default <root>/docs)"},
			{Name: "out", Description: "Output directory (default <root>/site)"},
			{Name: "base-url", Description: "Base URL for site links (overrides site.yaml base_url)"},
			{Name: "check", Description: "Validate the docs and write nothing", Bare: true},
		},
		Run: func(ctx context.Context, in bonfire.Input, out bonfire.Output) error {
			opts := docsOptions(in)
			if flagTrue(in, "check") {
				problems, err := docsite.Check(opts)
				if err != nil {
					return err
				}
				if len(problems) > 0 {
					return reportDocsProblems(out, "docs:build", problems)
				}
				out.Printf("docs:build: no problems found\n")
				return nil
			}
			result, problems, err := docsite.Build(opts)
			if err != nil {
				return err
			}
			if len(problems) > 0 {
				return reportDocsProblems(out, "docs:build", problems)
			}
			out.Printf("docs:build: wrote %d pages to %s\n", result.Pages, result.Out)
			return nil
		},
	}
}

func docsOptions(in bonfire.Input) docsite.Options {
	var opts docsite.Options
	opts.Root, _ = in.Flag("root")
	opts.Src, _ = in.Flag("src")
	opts.Out, _ = in.Flag("out")
	opts.BaseURL, _ = in.Flag("base-url")
	return opts
}

// reportDocsProblems prints one line per problem and a summary, and returns
// a short error so the binary exits 1.
func reportDocsProblems(out bonfire.Output, cmd string, problems []docsite.Problem) error {
	for _, p := range problems {
		out.Printf("%s\n", p)
	}
	out.Printf("%s: %d problems, nothing written\n", cmd, len(problems))
	return errors.New(cmd + " failed")
}