// Command mesh-delivery-view-tools serves the read tools of the indexer's modules (novox/hq issue 1562): the runtime launches it for a
// call, it reads the indexer's modules bucket through the view's reads (mesh-delivery-indexer.modules) and writes nothing.
// The view is the other program: the indexer serves no tool (ADR 0437 §4).
package main

import (
	"encoding/json"
	"fmt"
	"os"

	stdio "git.novox.be/novox/mesh-sdk/go"
	"mesh-delivery-view/internal/view"
)

// Tools are the read tools over a modules state.
func Tools(r view.Reader) []stdio.Tool {
	return []stdio.Tool{
		{Name: view.ModuleReadTool,
			Description: "What the indexer stored for one module under modules.<module>, as stored: its fingerprint (fp, none), the " +
				"new-form fingerprint (fp2) or why it has none (none2), the inputs it was computed from (inputs2), the module's " +
				"directory (path) and the toolchains it was computed with. Read-only.",
			Input: map[string]any{"type": "object", "required": []string{"module"}, "properties": map[string]any{
				"module": map[string]any{"type": "string", "description": "the module's name"}}},
			Run: func(args map[string]any) (any, error) {
				name, _ := args["module"].(string)
				return r.Module(name)
			}},
		{Name: view.ModulesReadTool,
			Description: "Every module the indexer holds, each as stored under modules.<module>. With none2 true, only the modules " +
				"that have no new-form fingerprint, each with the reason (none2). Read-only.",
			Input: map[string]any{"type": "object", "properties": map[string]any{
				"none2": map[string]any{"type": "boolean", "description": "only the modules without a new-form fingerprint"}}},
			Run: func(args map[string]any) (any, error) {
				only, _ := args["none2"].(bool)
				mods, err := r.Modules(only)
				return map[string]any{"modules": mods}, err
			}},
		{Name: view.CandidateReadTool,
			Description: "What the indexer stored for one candidate (the open pull requests of a branch) under candidates.<group>, as stored: " +
				"the pull requests and heads, the base, and per pull request the touched modules with their new-form fingerprint (fp2) or why " +
				"they have none (none2). Read-only.",
			Input: map[string]any{"type": "object", "required": []string{"group"}, "properties": map[string]any{
				"group": map[string]any{"type": "string", "description": "the candidate's group, the branch name its pull requests share"}}},
			Run: func(args map[string]any) (any, error) {
				group, _ := args["group"].(string)
				return r.Candidate(group)
			}},
		{Name: view.CandidatesReadTool,
			Description: "Every candidate the indexer holds, by group, each as stored under candidates.<group>; with module, only those with a " +
				"pull request touching that module. Keys that cannot be read are listed as unreadable. Read-only.",
			Input: map[string]any{"type": "object", "properties": map[string]any{
				"module": map[string]any{"type": "string", "description": "only candidates touching this module"}}},
			Run: func(args map[string]any) (any, error) {
				module, _ := args["module"].(string)
				c, bad, err := r.Candidates(module)
				return map[string]any{"candidates": c, "unreadable": bad}, err
			}},
		{Name: view.BuilderBuildsReadTool,
			Description: "The builder's build keys, each as stored in mesh-delivery-builder_builds: key, module, fingerprint (src2) and build " +
				"(state, by, step with the nodes it was built on, manifest, artifacts with their digests, toolchains, error). Narrow by module " +
				"or state (queued, building, done, failed); at most limit builds (default 50), newest revision first for a module, and the answer says when it was cut and lists keys that are no build key (unreadable). Without a module, give one to get its newest. Read-only.",
			Input: map[string]any{"type": "object", "properties": map[string]any{
				"module": map[string]any{"type": "string", "description": "only this module's builds"},
				"state":  map[string]any{"type": "string", "description": "only builds in this state"},
				"limit":  map[string]any{"type": "integer", "description": "at most this many builds (default 50), newest revision first"}}},
			Run: func(args map[string]any) (any, error) {
				module, _ := args["module"].(string)
				state, _ := args["state"].(string)
				limit, _ := args["limit"].(float64)
				return r.BuilderBuilds(module, state, int(limit))
			}},
		{Name: view.BuilderBuildReadTool,
			Description: "One build of the builder as stored. Give the module and its fingerprint (fp2, src2:...), or the module alone for the build " +
				"at the fingerprint the indexer holds for it now, joined through modules.<module>; with commit, only if the indexer holds the module at that commit. Read-only.",
			Input: map[string]any{"type": "object", "required": []string{"module"}, "properties": map[string]any{
				"module": map[string]any{"type": "string", "description": "the module's name"},
				"fp2":    map[string]any{"type": "string", "description": "its new-form fingerprint; empty means the indexer's current one"},
				"commit": map[string]any{"type": "string", "description": "the commit the indexer must hold the module at"}}},
			Run: func(args map[string]any) (any, error) {
				module, _ := args["module"].(string)
				fp2, _ := args["fp2"].(string)
				commit, _ := args["commit"].(string)
				return r.BuilderBuild(module, fp2, commit)
			}},
	}
}

func read(state stdio.KeptState) view.StateRead {
	return view.StateRead{Keys: state.Keys, GetEntry: func(key string) (json.RawMessage, uint64, error) {
		e, err := state.Get(key)
		if err != nil || e == nil {
			return nil, 0, err
		}
		return e.Value, e.Revision, nil
	}, Get: func(key string) (json.RawMessage, error) {
		e, err := state.Get(key)
		if err != nil || e == nil {
			return nil, err
		}
		return e.Value, nil
	}}
}

func main() {
	r := view.Reader{State: read(stdio.State("mesh-delivery-indexer.modules")), Builds: read(stdio.State("mesh-delivery-builder.builds")), CandidatesState: read(stdio.State("mesh-delivery-indexer.candidates"))}
	if err := stdio.Serve("", Tools(r)); err != nil {
		fmt.Fprintf(os.Stderr, "[mesh-delivery-view-tools] %v\n", err)
		os.Exit(1)
	}
}