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 BranchList struct {
	c *gitea.Client
	a *allowlist.Allowlist
}

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

func (t *BranchList) Descriptor() registry.ToolDescriptor {
	return registry.ToolDescriptor{
		Name:        "branch_list",
		Description: "List branches in a repository.",
		InputSchema: json.RawMessage(`{
			"type":"object",
			"properties":{
				"owner":{"type":"string"},
				"name":{"type":"string"},
				"page":{"type":"integer","minimum":1},
				"limit":{"type":"integer","minimum":1,"maximum":50}
			},
			"required":["owner","name"]
		}`),
	}
}

type branchListArgs struct {
	Owner string `json:"owner"`
	Name  string `json:"name"`
	Page  int    `json:"page"`
	Limit int    `json:"limit"`
}

func (t *BranchList) Call(ctx context.Context, raw json.RawMessage) (json.RawMessage, error) {
	var args branchListArgs
	if err := parseArgs(raw, &args); err != nil {
		return nil, err
	}
	if err := t.a.Check(args.Owner); err != nil {
		return nil, err
	}

	branches, err := t.c.ListBranches(ctx, args.Owner, args.Name, args.Page, capLimit(args.Limit, 30))
	if err != nil {
		return nil, err
	}

	result := make([]map[string]any, len(branches))
	for i, b := range branches {
		result[i] = map[string]any{
			"name": b.Name,
			"sha":  b.Commit.ID,
		}
	}
	return textOK(result)
}