// Copyright 2026 Alibaba Group
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package app

import (
	"os"
	"strings"
	"sync"

	"github.com/DingTalk-Real-AI/dingtalk-workspace-cli/internal/cli"
	"github.com/DingTalk-Real-AI/dingtalk-workspace-cli/internal/executor"
	"github.com/DingTalk-Real-AI/dingtalk-workspace-cli/internal/market"
)

var (
	dynamicMu            sync.RWMutex
	dynamicEndpoints     map[string]string
	dynamicProducts      map[string]bool
	dynamicAliases       map[string]string
	dynamicToolEndpoints map[string]string // tool name → endpoint
)

var legacyDirectRuntimeAliases = map[string]string{
	"tb":                       "teambition",
	"dingtalk-discovery":       "discovery",
	"dingtalk-oa-plus":         "oa",
	"dingtalk-ai-sincere-hire": "ai-sincere-hire",
}

// SetDynamicServers injects server data discovered from servers.json.
// All product endpoints are resolved dynamically from this data.
func SetDynamicServers(servers []market.ServerDescriptor) {
	dynamicMu.Lock()
	defer dynamicMu.Unlock()

	endpoints := make(map[string]string)
	products := make(map[string]bool)
	aliases := make(map[string]string)
	toolEndpoints := make(map[string]string)
	for _, server := range servers {
		if server.CLI.Skip {
			continue
		}
		id := strings.TrimSpace(server.CLI.ID)
		endpoint := strings.TrimSpace(server.Endpoint)
		if id != "" && endpoint != "" {
			endpoints[id] = endpoint
			products[id] = true
		}
		cmd := strings.TrimSpace(server.CLI.Command)
		if cmd != "" && cmd != id && endpoint != "" {
			endpoints[cmd] = endpoint
			products[cmd] = true
		}
		for _, alias := range server.CLI.Aliases {
			alias = strings.TrimSpace(alias)
			if alias != "" && endpoint != "" {
				endpoints[alias] = endpoint
				products[alias] = true
				// Build alias → CLI.ID mapping
				aliases[alias] = id
			}
		}
		// Build tool → endpoint mapping from CLI tools and overrides.
		if endpoint != "" {
			for _, tool := range server.CLI.Tools {
				toolName := strings.TrimSpace(tool.Name)
				if toolName != "" {
					toolEndpoints[toolName] = endpoint
				}
			}
			for toolName := range server.CLI.ToolOverrides {
				toolName = strings.TrimSpace(toolName)
				if toolName != "" {
					toolEndpoints[toolName] = endpoint
				}
			}
		}
	}
	dynamicEndpoints = endpoints
	dynamicProducts = products
	dynamicAliases = aliases
	dynamicToolEndpoints = toolEndpoints
}

func shouldUseDirectRuntime(invocation executor.Invocation) bool {
	if strings.TrimSpace(os.Getenv(cli.CatalogFixtureEnv)) != "" {
		return false
	}
	switch invocation.Kind {
	case "compat_invocation", "helper_invocation":
		return true
	default:
		return false
	}
}

func directRuntimeEndpoint(productID, toolName string) (string, bool) {
	// Priority 0: env-var override always wins (DINGTALK_<PRODUCT>_MCP_URL).
	normalized := normalizeDirectRuntimeProductID(productID)
	for _, candidate := range []string{strings.TrimSpace(productID), normalized} {
		if candidate == "" {
			continue
		}
		if override, ok := productEndpointOverride(candidate); ok {
			return override, true
		}
	}

	dynamicMu.RLock()
	de := dynamicEndpoints
	te := dynamicToolEndpoints
	dynamicMu.RUnlock()

	// Priority 1: tool-level endpoint (resolves multi-endpoint products).
	if tool := strings.TrimSpace(toolName); tool != "" && te != nil {
		if endpoint, ok := te[tool]; ok {
			return endpoint, true
		}
	}

	// Priority 2: product-level endpoint.
	for _, candidate := range []string{strings.TrimSpace(productID), normalized} {
		if candidate == "" {
			continue
		}
		if de != nil {
			if endpoint, ok := de[candidate]; ok {
				return endpoint, true
			}
		}
	}
	return "", false
}

// DirectRuntimeProductIDs returns the set of product IDs that have direct
// runtime endpoints configured, sourced from dynamic server discovery.
func DirectRuntimeProductIDs() map[string]bool {
	dynamicMu.RLock()
	dp := dynamicProducts
	dynamicMu.RUnlock()
	ids := make(map[string]bool, len(dp))
	for key := range dp {
		ids[key] = true
	}
	return ids
}

func normalizeDirectRuntimeProductID(productID string) string {
	dynamicMu.RLock()
	da := dynamicAliases
	dynamicMu.RUnlock()
	trimmed := strings.TrimSpace(productID)
	if da != nil {
		if normalizedID, ok := da[trimmed]; ok && normalizedID != "" {
			return normalizedID
		}
	}
	if normalizedID, ok := legacyDirectRuntimeAliases[trimmed]; ok {
		return normalizedID
	}
	return trimmed
}