package mcp

import (
	"context"
	"fmt"

	"github.com/google/uuid"
	mcpsdk "github.com/modelcontextprotocol/go-sdk/mcp"

	"github.com/yan1h/agent-coding-workflow/internal/infra/errs"
	"github.com/yan1h/agent-coding-workflow/internal/project"
	"github.com/yan1h/agent-coding-workflow/internal/workspace"
)

func registerPMTools(srv *mcpsdk.Server, deps ServerDeps) {
	registerListProjects(srv, deps)
	registerListWorkspaces(srv, deps)
	registerListRequirements(srv, deps)
	registerListIssues(srv, deps)
	registerGetIssue(srv, deps)
	registerGetRequirement(srv, deps)
	registerCreateIssue(srv, deps)
	registerUpdateIssue(srv, deps)
	registerCloseIssue(srv, deps)
	registerReopenIssue(srv, deps)
	registerAssignIssue(srv, deps)
	registerCreateRequirement(srv, deps)
	registerUpdateRequirement(srv, deps)
	registerCloseRequirement(srv, deps)
	registerReopenRequirement(srv, deps)
	registerSetRequirementPhase(srv, deps)
}

// ===== list_projects =====

type listProjectsIn struct {
	Archived bool `json:"archived,omitempty" jsonschema:"include archived projects"`
}
type projectSummary struct {
	Slug       string `json:"slug"`
	Name       string `json:"name"`
	Visibility string `json:"visibility"`
}
type listProjectsOut struct {
	Projects []projectSummary `json:"projects"`
}

func registerListProjects(srv *mcpsdk.Server, deps ServerDeps) {
	mcpsdk.AddTool(srv,
		&mcpsdk.Tool{Name: "list_projects", Description: "List projects visible to the caller."},
		func(ctx context.Context, _ *mcpsdk.CallToolRequest, in listProjectsIn) (*mcpsdk.CallToolResult, listProjectsOut, error) {
			if err := CheckToolFromCtx(ctx, "list_projects"); err != nil {
				return nil, listProjectsOut{}, err
			}
			c, err := deps.Caller.Resolve(ctx)
			if err != nil {
				return nil, listProjectsOut{}, err
			}
			ps, err := deps.Projects.List(ctx, c, in.Archived)
			if err != nil {
				return nil, listProjectsOut{}, err
			}
			out := listProjectsOut{Projects: make([]projectSummary, 0, len(ps))}
			for _, p := range ps {
				if err := CheckProjectFromCtx(ctx, p.ID); err != nil {
					continue
				}
				out.Projects = append(out.Projects, projectSummary{
					Slug: p.Slug, Name: p.Name, Visibility: string(p.Visibility),
				})
			}
			return nil, out, nil
		})
}

// ===== list_workspaces =====

type listWorkspacesIn struct {
	ProjectSlug string `json:"project_slug" jsonschema:"required,project slug"`
}
type workspaceSummary struct {
	ID            string `json:"id"`
	Slug          string `json:"slug"`
	Name          string `json:"name"`
	DefaultBranch string `json:"default_branch"`
	SyncStatus    string `json:"sync_status"`
}
type listWorkspacesOut struct {
	Workspaces []workspaceSummary `json:"workspaces"`
}

func registerListWorkspaces(srv *mcpsdk.Server, deps ServerDeps) {
	mcpsdk.AddTool(srv,
		&mcpsdk.Tool{Name: "list_workspaces", Description: "List workspaces in a project."},
		func(ctx context.Context, _ *mcpsdk.CallToolRequest, in listWorkspacesIn) (*mcpsdk.CallToolResult, listWorkspacesOut, error) {
			if err := CheckToolFromCtx(ctx, "list_workspaces"); err != nil {
				return nil, listWorkspacesOut{}, err
			}
			c, err := deps.Caller.Resolve(ctx)
			if err != nil {
				return nil, listWorkspacesOut{}, err
			}
			p, err := deps.Projects.Get(ctx, c, in.ProjectSlug)
			if err != nil {
				return nil, listWorkspacesOut{}, err
			}
			if err := CheckProjectFromCtx(ctx, p.ID); err != nil {
				return nil, listWorkspacesOut{}, err
			}
			wsCaller := workspace.Caller{UserID: c.UserID, IsAdmin: c.IsAdmin}
			ws, err := deps.Workspaces.List(ctx, wsCaller, in.ProjectSlug)
			if err != nil {
				return nil, listWorkspacesOut{}, err
			}
			out := listWorkspacesOut{Workspaces: make([]workspaceSummary, 0, len(ws))}
			for _, w := range ws {
				out.Workspaces = append(out.Workspaces, workspaceSummary{
					ID: w.ID.String(), Slug: w.Slug, Name: w.Name,
					DefaultBranch: w.DefaultBranch, SyncStatus: string(w.SyncStatus),
				})
			}
			return nil, out, nil
		})
}

// ===== list_requirements =====

type listRequirementsIn struct {
	ProjectSlug string `json:"project_slug" jsonschema:"required"`
	Phase       string `json:"phase,omitempty"`
	Status      string `json:"status,omitempty"`
}
type requirementSummary struct {
	Number int    `json:"number"`
	Title  string `json:"title"`
	Phase  string `json:"phase"`
	Status string `json:"status"`
}
type listRequirementsOut struct {
	Requirements []requirementSummary `json:"requirements"`
}

func registerListRequirements(srv *mcpsdk.Server, deps ServerDeps) {
	mcpsdk.AddTool(srv,
		&mcpsdk.Tool{Name: "list_requirements", Description: "List requirements in a project."},
		func(ctx context.Context, _ *mcpsdk.CallToolRequest, in listRequirementsIn) (*mcpsdk.CallToolResult, listRequirementsOut, error) {
			if err := CheckToolFromCtx(ctx, "list_requirements"); err != nil {
				return nil, listRequirementsOut{}, err
			}
			c, err := deps.Caller.Resolve(ctx)
			if err != nil {
				return nil, listRequirementsOut{}, err
			}
			p, err := deps.Projects.Get(ctx, c, in.ProjectSlug)
			if err != nil {
				return nil, listRequirementsOut{}, err
			}
			if err := CheckProjectFromCtx(ctx, p.ID); err != nil {
				return nil, listRequirementsOut{}, err
			}
			rs, err := deps.Reqs.List(ctx, c, in.ProjectSlug, project.RequirementFilter{
				Phase: project.Phase(in.Phase), Status: project.Status(in.Status),
			})
			if err != nil {
				return nil, listRequirementsOut{}, err
			}
			out := listRequirementsOut{Requirements: make([]requirementSummary, 0, len(rs))}
			for _, r := range rs {
				out.Requirements = append(out.Requirements, requirementSummary{
					Number: r.Number, Title: r.Title,
					Phase: string(r.Phase), Status: string(r.Status),
				})
			}
			return nil, out, nil
		})
}

// ===== list_issues =====

type listIssuesIn struct {
	ProjectSlug       string `json:"project_slug" jsonschema:"required"`
	RequirementNumber any    `json:"requirement_number,omitempty"`
	Status            string `json:"status,omitempty"`
	AssigneeID        string `json:"assignee_id,omitempty"`
}
type issueSummary struct {
	Number int    `json:"number"`
	Title  string `json:"title"`
	Status string `json:"status"`
}
type listIssuesOut struct {
	Issues []issueSummary `json:"issues"`
}

func registerListIssues(srv *mcpsdk.Server, deps ServerDeps) {
	mcpsdk.AddTool(srv,
		&mcpsdk.Tool{Name: "list_issues", Description: "List issues in a project."},
		func(ctx context.Context, _ *mcpsdk.CallToolRequest, in listIssuesIn) (*mcpsdk.CallToolResult, listIssuesOut, error) {
			if err := CheckToolFromCtx(ctx, "list_issues"); err != nil {
				return nil, listIssuesOut{}, err
			}
			c, err := deps.Caller.Resolve(ctx)
			if err != nil {
				return nil, listIssuesOut{}, err
			}
			p, err := deps.Projects.Get(ctx, c, in.ProjectSlug)
			if err != nil {
				return nil, listIssuesOut{}, err
			}
			if err := CheckProjectFromCtx(ctx, p.ID); err != nil {
				return nil, listIssuesOut{}, err
			}
			f := project.IssueFilter{Status: project.Status(in.Status)}
			switch v := in.RequirementNumber.(type) {
			case nil:
			case string:
				if v == "none" {
					zero := 0
					f.Requirement = &zero
				}
			case float64:
				n := int(v)
				f.Requirement = &n
			}
			if in.AssigneeID != "" {
				aid, err := uuid.Parse(in.AssigneeID)
				if err != nil {
					return nil, listIssuesOut{}, errs.Wrap(err, errs.CodeInvalidInput, "assignee_id parse")
				}
				f.AssigneeID = &aid
			}
			is, err := deps.Issues.List(ctx, c, in.ProjectSlug, f)
			if err != nil {
				return nil, listIssuesOut{}, err
			}
			out := listIssuesOut{Issues: make([]issueSummary, 0, len(is))}
			for _, i := range is {
				out.Issues = append(out.Issues, issueSummary{
					Number: i.Number, Title: i.Title, Status: string(i.Status),
				})
			}
			return nil, out, nil
		})
}

// ===== get_issue =====

type getIssueIn struct {
	ProjectSlug string `json:"project_slug" jsonschema:"required"`
	Number      int    `json:"number" jsonschema:"required,min=1"`
}
type issueDetail struct {
	Number      int    `json:"number"`
	Title       string `json:"title"`
	Description string `json:"description,omitempty"`
	Status      string `json:"status"`
	CreatedAt   string `json:"created_at"`
}

func registerGetIssue(srv *mcpsdk.Server, deps ServerDeps) {
	mcpsdk.AddTool(srv,
		&mcpsdk.Tool{Name: "get_issue", Description: "Get a single issue by project_slug + number."},
		func(ctx context.Context, _ *mcpsdk.CallToolRequest, in getIssueIn) (*mcpsdk.CallToolResult, issueDetail, error) {
			if err := CheckToolFromCtx(ctx, "get_issue"); err != nil {
				return nil, issueDetail{}, err
			}
			c, err := deps.Caller.Resolve(ctx)
			if err != nil {
				return nil, issueDetail{}, err
			}
			p, err := deps.Projects.Get(ctx, c, in.ProjectSlug)
			if err != nil {
				return nil, issueDetail{}, err
			}
			if err := CheckProjectFromCtx(ctx, p.ID); err != nil {
				return nil, issueDetail{}, err
			}
			i, err := deps.Issues.Get(ctx, c, in.ProjectSlug, in.Number)
			if err != nil {
				return nil, issueDetail{}, err
			}
			return nil, issueDetail{
				Number: i.Number, Title: i.Title, Description: i.Description,
				Status: string(i.Status), CreatedAt: i.CreatedAt.Format("2006-01-02T15:04:05Z07:00"),
			}, nil
		})
}

// ===== get_requirement =====

type getRequirementIn struct {
	ProjectSlug string `json:"project_slug" jsonschema:"required"`
	Number      int    `json:"number" jsonschema:"required,min=1"`
}
type requirementDetail struct {
	Number      int    `json:"number"`
	Title       string `json:"title"`
	Description string `json:"description,omitempty"`
	Phase       string `json:"phase"`
	Status      string `json:"status"`
	CreatedAt   string `json:"created_at"`
}

func registerGetRequirement(srv *mcpsdk.Server, deps ServerDeps) {
	mcpsdk.AddTool(srv,
		&mcpsdk.Tool{Name: "get_requirement", Description: "Get a single requirement by project_slug + number."},
		func(ctx context.Context, _ *mcpsdk.CallToolRequest, in getRequirementIn) (*mcpsdk.CallToolResult, requirementDetail, error) {
			if err := CheckToolFromCtx(ctx, "get_requirement"); err != nil {
				return nil, requirementDetail{}, err
			}
			c, err := deps.Caller.Resolve(ctx)
			if err != nil {
				return nil, requirementDetail{}, err
			}
			p, err := deps.Projects.Get(ctx, c, in.ProjectSlug)
			if err != nil {
				return nil, requirementDetail{}, err
			}
			if err := CheckProjectFromCtx(ctx, p.ID); err != nil {
				return nil, requirementDetail{}, err
			}
			r, err := deps.Reqs.Get(ctx, c, in.ProjectSlug, in.Number)
			if err != nil {
				return nil, requirementDetail{}, err
			}
			return nil, requirementDetail{
				Number: r.Number, Title: r.Title, Description: r.Description,
				Phase: string(r.Phase), Status: string(r.Status),
				CreatedAt: r.CreatedAt.Format("2006-01-02T15:04:05Z07:00"),
			}, nil
		})
}

// ===== create_issue =====

type createIssueIn struct {
	ProjectSlug string `json:"project_slug" jsonschema:"required"`
	Title       string `json:"title" jsonschema:"required,minLength=1"`
	Description string `json:"description,omitempty"`
}
type issueCreateOut struct {
	OK    bool        `json:"ok"`
	Issue issueDetail `json:"issue"`
}

func registerCreateIssue(srv *mcpsdk.Server, deps ServerDeps) {
	mcpsdk.AddTool(srv,
		&mcpsdk.Tool{Name: "create_issue", Description: "Create a new issue in a project."},
		func(ctx context.Context, _ *mcpsdk.CallToolRequest, in createIssueIn) (*mcpsdk.CallToolResult, issueCreateOut, error) {
			if err := CheckToolFromCtx(ctx, "create_issue"); err != nil {
				return nil, issueCreateOut{}, err
			}
			c, err := deps.Caller.Resolve(ctx)
			if err != nil {
				return nil, issueCreateOut{}, err
			}
			p, err := deps.Projects.Get(ctx, c, in.ProjectSlug)
			if err != nil {
				return nil, issueCreateOut{}, err
			}
			if err := CheckProjectFromCtx(ctx, p.ID); err != nil {
				return nil, issueCreateOut{}, err
			}
			i, err := deps.Issues.Create(ctx, c, in.ProjectSlug, project.CreateIssueInput{
				Title: in.Title, Description: in.Description,
			})
			if err != nil {
				return nil, issueCreateOut{}, err
			}
			return nil, issueCreateOut{OK: true, Issue: issueDetail{
				Number: i.Number, Title: i.Title, Description: i.Description,
				Status: string(i.Status), CreatedAt: i.CreatedAt.Format("2006-01-02T15:04:05Z07:00"),
			}}, nil
		})
}

// ===== update_issue =====

type updateIssueIn struct {
	ProjectSlug string `json:"project_slug" jsonschema:"required"`
	Number      int    `json:"number" jsonschema:"required,min=1"`
	Title       string `json:"title,omitempty"`
	Description string `json:"description,omitempty"`
}
type issueUpdateOut struct {
	OK    bool        `json:"ok"`
	Issue issueDetail `json:"issue"`
}

func registerUpdateIssue(srv *mcpsdk.Server, deps ServerDeps) {
	mcpsdk.AddTool(srv,
		&mcpsdk.Tool{Name: "update_issue", Description: "Update an existing issue."},
		func(ctx context.Context, _ *mcpsdk.CallToolRequest, in updateIssueIn) (*mcpsdk.CallToolResult, issueUpdateOut, error) {
			if err := CheckToolFromCtx(ctx, "update_issue"); err != nil {
				return nil, issueUpdateOut{}, err
			}
			c, err := deps.Caller.Resolve(ctx)
			if err != nil {
				return nil, issueUpdateOut{}, err
			}
			p, err := deps.Projects.Get(ctx, c, in.ProjectSlug)
			if err != nil {
				return nil, issueUpdateOut{}, err
			}
			if err := CheckProjectFromCtx(ctx, p.ID); err != nil {
				return nil, issueUpdateOut{}, err
			}
			input := project.UpdateIssueInput{}
			if in.Title != "" {
				input.Title = &in.Title
			}
			if in.Description != "" {
				input.Description = &in.Description
			}
			i, err := deps.Issues.Update(ctx, c, in.ProjectSlug, in.Number, input)
			if err != nil {
				return nil, issueUpdateOut{}, err
			}
			return nil, issueUpdateOut{OK: true, Issue: issueDetail{
				Number: i.Number, Title: i.Title, Description: i.Description,
				Status: string(i.Status), CreatedAt: i.CreatedAt.Format("2006-01-02T15:04:05Z07:00"),
			}}, nil
		})
}

// ===== close/reopen_issue =====

type closeIssueIn struct {
	ProjectSlug string `json:"project_slug" jsonschema:"required"`
	Number      int    `json:"number" jsonschema:"required,min=1"`
}
type okOut struct {
	OK bool `json:"ok"`
}

func registerCloseIssue(srv *mcpsdk.Server, deps ServerDeps) {
	mcpsdk.AddTool(srv,
		&mcpsdk.Tool{Name: "close_issue", Description: "Close an issue (idempotent)."},
		func(ctx context.Context, _ *mcpsdk.CallToolRequest, in closeIssueIn) (*mcpsdk.CallToolResult, okOut, error) {
			if err := CheckToolFromCtx(ctx, "close_issue"); err != nil {
				return nil, okOut{}, err
			}
			c, err := deps.Caller.Resolve(ctx)
			if err != nil {
				return nil, okOut{}, err
			}
			p, err := deps.Projects.Get(ctx, c, in.ProjectSlug)
			if err != nil {
				return nil, okOut{}, err
			}
			if err := CheckProjectFromCtx(ctx, p.ID); err != nil {
				return nil, okOut{}, err
			}
			if err := deps.Issues.Close(ctx, c, in.ProjectSlug, in.Number); err != nil {
				return nil, okOut{}, err
			}
			return nil, okOut{OK: true}, nil
		})
}

func registerReopenIssue(srv *mcpsdk.Server, deps ServerDeps) {
	mcpsdk.AddTool(srv,
		&mcpsdk.Tool{Name: "reopen_issue", Description: "Reopen a closed issue (idempotent)."},
		func(ctx context.Context, _ *mcpsdk.CallToolRequest, in closeIssueIn) (*mcpsdk.CallToolResult, okOut, error) {
			if err := CheckToolFromCtx(ctx, "reopen_issue"); err != nil {
				return nil, okOut{}, err
			}
			c, err := deps.Caller.Resolve(ctx)
			if err != nil {
				return nil, okOut{}, err
			}
			p, err := deps.Projects.Get(ctx, c, in.ProjectSlug)
			if err != nil {
				return nil, okOut{}, err
			}
			if err := CheckProjectFromCtx(ctx, p.ID); err != nil {
				return nil, okOut{}, err
			}
			if err := deps.Issues.Reopen(ctx, c, in.ProjectSlug, in.Number); err != nil {
				return nil, okOut{}, err
			}
			return nil, okOut{OK: true}, nil
		})
}

// ===== assign_issue =====

type assignIssueIn struct {
	ProjectSlug string  `json:"project_slug" jsonschema:"required"`
	Number      int     `json:"number" jsonschema:"required,min=1"`
	AssigneeID  *string `json:"assignee_id,omitempty"`
}

func registerAssignIssue(srv *mcpsdk.Server, deps ServerDeps) {
	mcpsdk.AddTool(srv,
		&mcpsdk.Tool{Name: "assign_issue", Description: "Assign or unassign an issue."},
		func(ctx context.Context, _ *mcpsdk.CallToolRequest, in assignIssueIn) (*mcpsdk.CallToolResult, okOut, error) {
			if err := CheckToolFromCtx(ctx, "assign_issue"); err != nil {
				return nil, okOut{}, err
			}
			c, err := deps.Caller.Resolve(ctx)
			if err != nil {
				return nil, okOut{}, err
			}
			p, err := deps.Projects.Get(ctx, c, in.ProjectSlug)
			if err != nil {
				return nil, okOut{}, err
			}
			if err := CheckProjectFromCtx(ctx, p.ID); err != nil {
				return nil, okOut{}, err
			}
			var assignee *uuid.UUID
			if in.AssigneeID != nil && *in.AssigneeID != "" {
				aid, err := uuid.Parse(*in.AssigneeID)
				if err != nil {
					return nil, okOut{}, errs.Wrap(err, errs.CodeInvalidInput, "assignee_id parse")
				}
				assignee = &aid
			}
			if _, err := deps.Issues.Assign(ctx, c, in.ProjectSlug, in.Number, assignee); err != nil {
				return nil, okOut{}, err
			}
			return nil, okOut{OK: true}, nil
		})
}

// ===== create_requirement =====

type createRequirementIn struct {
	ProjectSlug string `json:"project_slug" jsonschema:"required"`
	Title       string `json:"title" jsonschema:"required,minLength=1"`
	Description string `json:"description,omitempty"`
}
type requirementCreateOut struct {
	OK          bool              `json:"ok"`
	Requirement requirementDetail `json:"requirement"`
}

func registerCreateRequirement(srv *mcpsdk.Server, deps ServerDeps) {
	mcpsdk.AddTool(srv,
		&mcpsdk.Tool{Name: "create_requirement", Description: "Create a new requirement."},
		func(ctx context.Context, _ *mcpsdk.CallToolRequest, in createRequirementIn) (*mcpsdk.CallToolResult, requirementCreateOut, error) {
			if err := CheckToolFromCtx(ctx, "create_requirement"); err != nil {
				return nil, requirementCreateOut{}, err
			}
			c, err := deps.Caller.Resolve(ctx)
			if err != nil {
				return nil, requirementCreateOut{}, err
			}
			p, err := deps.Projects.Get(ctx, c, in.ProjectSlug)
			if err != nil {
				return nil, requirementCreateOut{}, err
			}
			if err := CheckProjectFromCtx(ctx, p.ID); err != nil {
				return nil, requirementCreateOut{}, err
			}
			r, err := deps.Reqs.Create(ctx, c, in.ProjectSlug, project.CreateRequirementInput{
				Title: in.Title, Description: in.Description,
			})
			if err != nil {
				return nil, requirementCreateOut{}, err
			}
			return nil, requirementCreateOut{OK: true, Requirement: requirementDetail{
				Number: r.Number, Title: r.Title, Description: r.Description,
				Phase: string(r.Phase), Status: string(r.Status),
				CreatedAt: r.CreatedAt.Format("2006-01-02T15:04:05Z07:00"),
			}}, nil
		})
}

// ===== update_requirement =====

type updateRequirementIn struct {
	ProjectSlug string `json:"project_slug" jsonschema:"required"`
	Number      int    `json:"number" jsonschema:"required,min=1"`
	Title       string `json:"title,omitempty"`
	Description string `json:"description,omitempty"`
}

func registerUpdateRequirement(srv *mcpsdk.Server, deps ServerDeps) {
	mcpsdk.AddTool(srv,
		&mcpsdk.Tool{Name: "update_requirement", Description: "Update an existing requirement."},
		func(ctx context.Context, _ *mcpsdk.CallToolRequest, in updateRequirementIn) (*mcpsdk.CallToolResult, requirementCreateOut, error) {
			if err := CheckToolFromCtx(ctx, "update_requirement"); err != nil {
				return nil, requirementCreateOut{}, err
			}
			c, err := deps.Caller.Resolve(ctx)
			if err != nil {
				return nil, requirementCreateOut{}, err
			}
			p, err := deps.Projects.Get(ctx, c, in.ProjectSlug)
			if err != nil {
				return nil, requirementCreateOut{}, err
			}
			if err := CheckProjectFromCtx(ctx, p.ID); err != nil {
				return nil, requirementCreateOut{}, err
			}
			input := project.UpdateRequirementInput{}
			if in.Title != "" {
				input.Title = &in.Title
			}
			if in.Description != "" {
				input.Description = &in.Description
			}
			r, err := deps.Reqs.Update(ctx, c, in.ProjectSlug, in.Number, input)
			if err != nil {
				return nil, requirementCreateOut{}, err
			}
			return nil, requirementCreateOut{OK: true, Requirement: requirementDetail{
				Number: r.Number, Title: r.Title, Description: r.Description,
				Phase: string(r.Phase), Status: string(r.Status),
				CreatedAt: r.CreatedAt.Format("2006-01-02T15:04:05Z07:00"),
			}}, nil
		})
}

// ===== close/reopen_requirement =====

type closeRequirementIn struct {
	ProjectSlug string `json:"project_slug" jsonschema:"required"`
	Number      int    `json:"number" jsonschema:"required,min=1"`
}

func registerCloseRequirement(srv *mcpsdk.Server, deps ServerDeps) {
	mcpsdk.AddTool(srv,
		&mcpsdk.Tool{Name: "close_requirement", Description: "Close a requirement (idempotent)."},
		func(ctx context.Context, _ *mcpsdk.CallToolRequest, in closeRequirementIn) (*mcpsdk.CallToolResult, okOut, error) {
			if err := CheckToolFromCtx(ctx, "close_requirement"); err != nil {
				return nil, okOut{}, err
			}
			c, err := deps.Caller.Resolve(ctx)
			if err != nil {
				return nil, okOut{}, err
			}
			p, err := deps.Projects.Get(ctx, c, in.ProjectSlug)
			if err != nil {
				return nil, okOut{}, err
			}
			if err := CheckProjectFromCtx(ctx, p.ID); err != nil {
				return nil, okOut{}, err
			}
			if err := deps.Reqs.Close(ctx, c, in.ProjectSlug, in.Number); err != nil {
				return nil, okOut{}, err
			}
			return nil, okOut{OK: true}, nil
		})
}

func registerReopenRequirement(srv *mcpsdk.Server, deps ServerDeps) {
	mcpsdk.AddTool(srv,
		&mcpsdk.Tool{Name: "reopen_requirement", Description: "Reopen a closed requirement (idempotent)."},
		func(ctx context.Context, _ *mcpsdk.CallToolRequest, in closeRequirementIn) (*mcpsdk.CallToolResult, okOut, error) {
			if err := CheckToolFromCtx(ctx, "reopen_requirement"); err != nil {
				return nil, okOut{}, err
			}
			c, err := deps.Caller.Resolve(ctx)
			if err != nil {
				return nil, okOut{}, err
			}
			p, err := deps.Projects.Get(ctx, c, in.ProjectSlug)
			if err != nil {
				return nil, okOut{}, err
			}
			if err := CheckProjectFromCtx(ctx, p.ID); err != nil {
				return nil, okOut{}, err
			}
			if err := deps.Reqs.Reopen(ctx, c, in.ProjectSlug, in.Number); err != nil {
				return nil, okOut{}, err
			}
			return nil, okOut{OK: true}, nil
		})
}

// ===== set_requirement_phase =====

type setRequirementPhaseIn struct {
	ProjectSlug string `json:"project_slug" jsonschema:"required"`
	Number      int    `json:"number" jsonschema:"required,min=1"`
	Phase       string `json:"phase" jsonschema:"required"`
}

func registerSetRequirementPhase(srv *mcpsdk.Server, deps ServerDeps) {
	mcpsdk.AddTool(srv,
		&mcpsdk.Tool{Name: "set_requirement_phase", Description: "Change a requirement's phase."},
		func(ctx context.Context, _ *mcpsdk.CallToolRequest, in setRequirementPhaseIn) (*mcpsdk.CallToolResult, requirementCreateOut, error) {
			if err := CheckToolFromCtx(ctx, "set_requirement_phase"); err != nil {
				return nil, requirementCreateOut{}, err
			}
			c, err := deps.Caller.Resolve(ctx)
			if err != nil {
				return nil, requirementCreateOut{}, err
			}
			p, err := deps.Projects.Get(ctx, c, in.ProjectSlug)
			if err != nil {
				return nil, requirementCreateOut{}, err
			}
			if err := CheckProjectFromCtx(ctx, p.ID); err != nil {
				return nil, requirementCreateOut{}, err
			}
			r, err := deps.Reqs.ChangePhase(ctx, c, in.ProjectSlug, in.Number, project.Phase(in.Phase))
			if err != nil {
				return nil, requirementCreateOut{}, err
			}
			return nil, requirementCreateOut{OK: true, Requirement: requirementDetail{
				Number: r.Number, Title: r.Title, Description: r.Description,
				Phase: string(r.Phase), Status: string(r.Status),
				CreatedAt: r.CreatedAt.Format("2006-01-02T15:04:05Z07:00"),
			}}, nil
		})
}

// 保证 fmt 引用（编译期检查）
var _ = fmt.Sprintf