package cmd

import (
	"flag"
	"fmt"
	"strings"

	"git.noodles.cam/claude-skills/marketplace/cli/internal/issue"
)

func init() {
	register(&Command{
		Name:  "evict",
		Group: GroupIssue,
		Args:  "[<id>…]",
		Short: "remove closed issues from the local store",
		Long: `The store is a working set, not an archive. What is evicted is two conditions,
both read off the file:

    state: closed      the work is done
    origin: <tracker>  the work is somewhere else too

THE SECOND CONDITION IS THE WHOLE SAFETY ARGUMENT. ` + "`origin: local`" + ` means this
file IS the issue — there is no other copy and deleting it deletes the work. It
is never evicted, in any state, not even when named explicitly on the command
line: a closed local issue is reported and kept.

Eviction asks the file rather than the tracker, because state and origin are
domain fields and the answer is already in the store — which is why this needs
no network and no login. ` + "`kettle sync-evict`" + ` is the variant that refreshes state
from the tracker first and then makes the same decision.

Not a one-off migration: a pull by number fetches an issue in any state, so a
closed issue pulled after an eviction lands on disk again. Evict it again when
you are done with it.

INDEX.md is rebuilt, because it IS a view of the directory. The number -> slug
ledger is deliberately not pruned: its entries outlive the files they name, and
that is what makes a pull land on the same slug afterwards.`,
		Examples: []Example{
			{"kettle evict", "every closed issue that is not origin: local"},
			{"kettle evict old-thing another-thing", "only these"},
			{"kettle evict --dry-run", "print what would go; touch nothing"},
		},
		Setup: func(fs *flag.FlagSet) func([]string) error {
			dryRun := fs.Bool("dry-run", false, "print what would be removed; touch nothing")
			out := storeFlag(fs)

			return func(args []string) error {
				root, err := storeRoot(*out)
				if err != nil {
					return err
				}
				if !issue.StoreExists(root) {
					return Fail("store %s does not exist — nothing to evict", root)
				}
				issues, err := issue.LoadAll(root)
				if err != nil {
					return err
				}
				var missing []string
				for _, id := range args {
					if _, ok := issues[id]; !ok {
						missing = append(missing, id)
					}
				}
				if len(missing) > 0 {
					return Fail("no such issue(s) in the store: %s", strings.Join(missing, ", "))
				}

				rep, err := issue.Evict(root, issues, args, *dryRun)
				if err != nil {
					return err
				}
				printEviction(rep, len(args) > 0)
				return nil
			}
		},
	})
}

func printEviction(rep *issue.EvictReport, named bool) {
	verb := "evicted"
	if rep.DryRun {
		verb = "would evict"
	}
	for _, e := range rep.Evicted {
		fmt.Printf("%-11s  %s\n", verb, e.ID)
		for _, p := range e.Paths {
			fmt.Printf("    %s\n", p)
		}
	}
	for _, k := range rep.Kept {
		// An open issue is the normal case and says nothing worth a line —
		// unless the operator named it, in which case they are owed the reason.
		if k.Open && !named {
			continue
		}
		if k.Open {
			fmt.Printf("%-11s  %s  %s\n", "kept", k.ID, k.Why)
		} else {
			fmt.Printf("%-11s  %s  closed, %s\n", "kept", k.ID, k.Why)
		}
	}

	if rep.DryRun {
		fmt.Printf("%d issue(s) would be evicted, %d kept — nothing was touched\n",
			len(rep.Evicted), len(rep.Kept))
		return
	}
	fmt.Printf("%d issue(s) evicted, %d kept\n", len(rep.Evicted), len(rep.Kept))
	if rep.IndexPath != "" {
		fmt.Printf("index: %s — %d issue(s)\n", rep.IndexPath, rep.IndexCount)
	}
}