package tools

import (
	"context"
	"encoding/json"

	"gitea.d-ma.be/mathias/gitea-mcp/internal/allowlist"
	"gitea.d-ma.be/mathias/gitea-mcp/internal/gitea"
	"gitea.d-ma.be/mathias/gitea-mcp/internal/registry"
)

type IssueList struct {
	c *gitea.Client
	a *allowlist.Allowlist
}

func NewIssueList(c *gitea.Client, a *allowlist.Allowlist) *IssueList {
	return &IssueList{c: c, a: a}
}

func (t *IssueList) Descriptor() registry.ToolDescriptor {
	return registry.ToolDescriptor{
		Name:        "issue_list",
		Description: "List issues in a repo with optional filters. PRs are excluded (use pr_list for those).",
		InputSchema: json.RawMessage(`{
			"type":"object",
			"properties":{
				"owner":{"type":"string"},
				"name":{"type":"string"},
				"state":{"type":"string","enum":["open","closed","all"]},
				"labels":{"type":"string"},
				"since":{"type":"string"},
				"page":{"type":"integer","minimum":1},
				"limit":{"type":"integer","minimum":1,"maximum":50}
			},
			"required":["owner","name"]
		}`),
	}
}

type issueListArgs struct {
	Owner  string `json:"owner"`
	Name   string `json:"name"`
	State  string `json:"state"`
	Labels string `json:"labels"`
	Since  string `json:"since"`
	Page   int    `json:"page"`
	Limit  int    `json:"limit"`
}

func (t *IssueList) Call(ctx context.Context, raw json.RawMessage) (json.RawMessage, error) {
	var args issueListArgs
	if err := parseArgs(raw, &args); err != nil {
		return nil, err
	}
	if err := t.a.Check(args.Owner); err != nil {
		return nil, err
	}
	if args.State == "" {
		args.State = "open"
	}
	args.Limit = capLimit(args.Limit, 30)
	if args.Page < 1 {
		args.Page = 1
	}
	issues, err := t.c.ListIssues(ctx, args.Owner, args.Name, gitea.ListIssuesArgs{
		State:  args.State,
		Labels: args.Labels,
		Since:  args.Since,
		Page:   args.Page,
		Limit:  args.Limit,
	})
	if err != nil {
		return nil, err
	}
	out := map[string]any{
		"issues": issues,
	}
	if len(issues) == args.Limit {
		out["next_page"] = args.Page + 1
	}
	return textOK(out)
}