package tools

import (
	"context"
	"encoding/json"
	"fmt"

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

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

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

func (t *IssueComment) Descriptor() registry.ToolDescriptor {
	return registry.ToolDescriptor{
		Name:        "issue_comment",
		Description: "Comment on an issue. Applies identity footer to body.",
		InputSchema: json.RawMessage(`{
			"type":"object",
			"properties":{
				"owner":{"type":"string"},
				"name":{"type":"string"},
				"number":{"type":"integer","minimum":1},
				"body":{"type":"string"}
			},
			"required":["owner","name","number","body"]
		}`),
	}
}

type issueCommentArgs struct {
	Owner  string `json:"owner"`
	Name   string `json:"name"`
	Number int    `json:"number"`
	Body   string `json:"body"`
}

func (t *IssueComment) Call(ctx context.Context, raw json.RawMessage) (json.RawMessage, error) {
	var args issueCommentArgs
	if err := parseArgs(raw, &args); err != nil {
		return nil, err
	}
	if err := t.a.Check(args.Owner); err != nil {
		return nil, err
	}
	if args.Number < 1 {
		return nil, fmt.Errorf("number must be >= 1: %w", gitea.ErrValidation)
	}
	if args.Body == "" {
		return nil, fmt.Errorf("body is required: %w", gitea.ErrValidation)
	}
	body := identity.ApplyFooter(args.Body, auth.Caller(ctx))

	c, err := t.c.CreateIssueComment(ctx, args.Owner, args.Name, args.Number, body)
	if err != nil {
		return nil, err
	}

	return textOK(map[string]any{
		"id":       c.ID,
		"html_url": c.HTMLURL,
	})
}