package main

import (
	"fmt"
	"os"
	"strings"

	"github.com/cheat/cheat/internal/config"
	"github.com/cheat/cheat/internal/display"
	"github.com/cheat/cheat/internal/sheets"
)

// cmdView displays a cheatsheet for viewing.
func cmdView(opts map[string]interface{}, conf config.Config) {

	cheatsheet := opts["<cheatsheet>"].(string)

	// load the cheatsheets
	cheatsheets, err := sheets.Load(conf.Cheatpaths)
	if err != nil {
		fmt.Fprintf(os.Stderr, "failed to list cheatsheets: %v\n", err)
		os.Exit(1)
	}

	// filter cheatcheats by tag if --tag was provided
	if opts["--tag"] != nil {
		cheatsheets = sheets.Filter(
			cheatsheets,
			strings.Split(opts["--tag"].(string), ","),
		)
	}

	// if --all was passed, display cheatsheets from all cheatpaths
	if opts["--all"].(bool) {
		// iterate over the cheatpaths
		out := ""
		for _, cheatpath := range cheatsheets {

			// if the cheatpath contains the specified cheatsheet, display it
			if sheet, ok := cheatpath[cheatsheet]; ok {

				// identify the matching cheatsheet
				out += fmt.Sprintf("%s %s\n",
					sheet.Title,
					display.Faint(fmt.Sprintf("(%s)", sheet.CheatPath), conf),
				)

				// apply colorization if requested
				if conf.Color(opts) {
					sheet.Colorize(conf)
				}

				// display the cheatsheet
				out += display.Indent(sheet.Text) + "\n"
			}
		}

		// display and exit
		display.Write(strings.TrimSuffix(out, "\n"), conf)
		os.Exit(0)
	}

	// otherwise, consolidate the cheatsheets found on all paths into a single
	// map of `title` => `sheet` (ie, allow more local cheatsheets to override
	// less local cheatsheets)
	consolidated := sheets.Consolidate(cheatsheets)

	// fail early if the requested cheatsheet does not exist
	sheet, ok := consolidated[cheatsheet]
	if !ok {
		fmt.Printf("No cheatsheet found for '%s'.\n", cheatsheet)
		os.Exit(2)
	}

	// apply colorization if requested
	if conf.Color(opts) {
		sheet.Colorize(conf)
	}

	// display the cheatsheet
	display.Write(sheet.Text, conf)
}