package gitea

import (
	"fmt"
	"net/http"
	"strconv"
	"strings"

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

// ListLabels is every label in the repository, every page of it.
//
// A bootstrap decides its plan against this and never against a cache: a cache
// answers "what did we create last time", and the question is "what does the
// repository have right now".
func (c *Client) ListLabels() ([]wire.Label, error) {
	return paginate[wire.Label](c, c.repoPath("labels"), 100)
}

// CreateLabel adds a label to the repository.
//
// Through the API rather than through any CLI wrapper, because `exclusive` —
// the flag that makes `type/*` behave like a single choice — is not something
// the `tea` client could set.
//
// What a label MEANS is not decided here either: this creates what it is
// handed.
func (c *Client) CreateLabel(req wire.LabelRequest) (*wire.Label, error) {
	var got wire.Label
	body := &Body{Name: "label-" + req.Name, Data: req}
	if err := c.Call(http.MethodPost, c.repoPath("labels"), body, &got); err != nil {
		return nil, err
	}
	if got.ID == 0 {
		return nil, fmt.Errorf("creating label %q: the tracker's answer carries no id", req.Name)
	}
	return &got, nil
}

// EditLabel patches an existing label by id.
func (c *Client) EditLabel(id int64, req wire.LabelRequest) (*wire.Label, error) {
	var got wire.Label
	body := &Body{Name: "label-" + req.Name, Data: req}
	if err := c.Call(http.MethodPatch, c.repoPathf("labels/%d", id), body, &got); err != nil {
		return nil, err
	}
	return &got, nil
}

// ListMilestones is every milestone in the repository, open and closed.
//
// Both states, always: a milestone is closed the moment its work is done, and a
// listing that hid those would fail to resolve exactly the filter somebody
// types when they want to see what was in it.
func (c *Client) ListMilestones() ([]wire.Milestone, error) {
	return paginate[wire.Milestone](c, c.repoPath("milestones?state=all"), 100)
}

// ResolveMilestone finds a milestone by id or by title, and fails when there is
// none.
//
// It fails LOUDLY, and that is the whole point of resolving before filtering:
// Gitea silently ignores a `milestones=` filter it cannot resolve and answers
// with the entire backlog. A typo in a milestone name would otherwise read as
// "your milestone has 300 issues in it".
func (c *Client) ResolveMilestone(value string) (*wire.Milestone, error) {
	got, err := c.ListMilestones()
	if err != nil {
		return nil, err
	}
	for i := range got {
		if got[i].Title == value || strconv.FormatInt(got[i].ID, 10) == value {
			return &got[i], nil
		}
	}
	have := make([]string, 0, len(got))
	for _, m := range got {
		have = append(have, fmt.Sprintf("%s (id %d)", m.Title, m.ID))
	}
	if len(have) == 0 {
		have = []string{"none"}
	}
	return nil, fmt.Errorf("no milestone %q in %s — have: %s", value, c.repo, strings.Join(have, ", "))
}

// FindMilestone is the milestone with this title, or nil when the repository
// has no such milestone.
//
// The quiet counterpart of ResolveMilestone, for a push: an issue naming a
// milestone the tracker does not have is filed without one, because refusing
// the whole push over a field the tracker will happily accept as empty helps
// nobody. "none" and "" are both "no milestone".
func (c *Client) FindMilestone(title string) (*wire.Milestone, error) {
	if title == "" || title == "none" {
		return nil, nil
	}
	got, err := c.ListMilestones()
	if err != nil {
		return nil, err
	}
	for i := range got {
		if got[i].Title == title {
			return &got[i], nil
		}
	}
	return nil, nil
}