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

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

func (t *BranchProtectionGet) Descriptor() registry.ToolDescriptor {
	return registry.ToolDescriptor{
		Name:        "branch_protection_get",
		Description: "Get branch protection rules. Returns {protected:false} if no rule exists — never returns an error for unprotected branches.",
		InputSchema: json.RawMessage(`{
			"type":"object",
			"properties":{
				"owner":{"type":"string"},
				"name":{"type":"string"},
				"branch":{"type":"string"}
			},
			"required":["owner","name","branch"]
		}`),
	}
}

type branchProtectionGetArgs struct {
	Owner  string `json:"owner"`
	Name   string `json:"name"`
	Branch string `json:"branch"`
}

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

	bp, err := t.c.GetBranchProtection(ctx, args.Owner, args.Name, args.Branch)
	if err != nil {
		return nil, err
	}

	return textOK(map[string]any{
		"protected":          bp.Protected,
		"required_approvals": bp.RequiredApprovals,
		"push_whitelist":     bp.PushWhitelist,
		"merge_whitelist":    bp.MergeWhitelist,
	})
}