// Package fonts installs AUR fonts via the yay helper.
package fonts

import (
	"context"
	"errors"
	"fmt"
	"strings"

	"gitlab.hive-brain.de/MDietermann/Archduino/internal/module"
	"gitlab.hive-brain.de/MDietermann/Archduino/internal/platform"
)

type Module struct {
	fonts []string
	pm    platform.PackageManager
	aur   platform.AURHelper
}

func New(fonts []string, pm platform.PackageManager, aur platform.AURHelper) Module {
	return Module{fonts: fonts, pm: pm, aur: aur}
}

type state struct{ Missing []string }

func (Module) Meta() module.Meta {
	return module.Meta{ID: "fonts", Name: "Nerd fonts", Description: "Install AUR nerd fonts."}
}

func (m Module) Detect(ctx context.Context) (module.State, error) {
	var missing []string
	for _, f := range m.fonts {
		ok, err := m.pm.IsInstalled(ctx, f)
		if err != nil {
			return nil, err
		}
		if !ok {
			missing = append(missing, f)
		}
	}
	return state{Missing: missing}, nil
}

func (m Module) Plan(ctx context.Context, cur module.State) (module.Plan, error) {
	s, _ := cur.(state)
	if len(s.Missing) == 0 {
		return module.Plan{}, nil
	}
	missing := append([]string{}, s.Missing...)
	return module.Plan{Actions: []module.Action{
		{
			Description: "ensure yay installed",
			Kind:        module.ActionPackageInstall,
			Exec:        func(ctx context.Context) error { return m.aur.EnsureInstalled(ctx) },
		},
		{
			Description: "yay install " + strings.Join(missing, ", "),
			Kind:        module.ActionPackageInstall,
			Exec:        func(ctx context.Context) error { return m.aur.Install(ctx, missing) },
		},
	}}, nil
}

func (m Module) Apply(ctx context.Context, p module.Plan, r module.Reporter) error {
	for i, a := range p.Actions {
		r.Progress(m.Meta().ID, i+1, len(p.Actions), a.Description)
		if err := a.Exec(ctx); err != nil {
			return err
		}
	}
	return nil
}

func (m Module) Verify(ctx context.Context) error {
	st, err := m.Detect(ctx)
	if err != nil {
		return err
	}
	if miss := st.(state).Missing; len(miss) > 0 {
		return fmt.Errorf("fonts still missing: %v", miss)
	}
	return nil
}

func (m Module) PlanForce(ctx context.Context) (module.Plan, error) {
	return module.Plan{}, errors.New("PlanForce not implemented")
}